cregit-Linux how code gets into the kernel

Release 4.15 include/linux/skbuff.h

Directory: include/linux
/*
 *      Definitions for the 'struct sk_buff' memory handlers.
 *
 *      Authors:
 *              Alan Cox, <gw4pts@gw4pts.ampr.org>
 *              Florian La Roche, <rzsfl@rz.uni-sb.de>
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */

#ifndef _LINUX_SKBUFF_H

#define _LINUX_SKBUFF_H

#include <linux/kernel.h>
#include <linux/compiler.h>
#include <linux/time.h>
#include <linux/bug.h>
#include <linux/cache.h>
#include <linux/rbtree.h>
#include <linux/socket.h>
#include <linux/refcount.h>

#include <linux/atomic.h>
#include <asm/types.h>
#include <linux/spinlock.h>
#include <linux/net.h>
#include <linux/textsearch.h>
#include <net/checksum.h>
#include <linux/rcupdate.h>
#include <linux/hrtimer.h>
#include <linux/dma-mapping.h>
#include <linux/netdev_features.h>
#include <linux/sched.h>
#include <linux/sched/clock.h>
#include <net/flow_dissector.h>
#include <linux/splice.h>
#include <linux/in6.h>
#include <linux/if_packet.h>
#include <net/flow.h>

/* The interface for checksum offload between the stack and networking drivers
 * is as follows...
 *
 * A. IP checksum related features
 *
 * Drivers advertise checksum offload capabilities in the features of a device.
 * From the stack's point of view these are capabilities offered by the driver,
 * a driver typically only advertises features that it is capable of offloading
 * to its device.
 *
 * The checksum related features are:
 *
 *      NETIF_F_HW_CSUM - The driver (or its device) is able to compute one
 *                        IP (one's complement) checksum for any combination
 *                        of protocols or protocol layering. The checksum is
 *                        computed and set in a packet per the CHECKSUM_PARTIAL
 *                        interface (see below).
 *
 *      NETIF_F_IP_CSUM - Driver (device) is only able to checksum plain
 *                        TCP or UDP packets over IPv4. These are specifically
 *                        unencapsulated packets of the form IPv4|TCP or
 *                        IPv4|UDP where the Protocol field in the IPv4 header
 *                        is TCP or UDP. The IPv4 header may contain IP options
 *                        This feature cannot be set in features for a device
 *                        with NETIF_F_HW_CSUM also set. This feature is being
 *                        DEPRECATED (see below).
 *
 *      NETIF_F_IPV6_CSUM - Driver (device) is only able to checksum plain
 *                        TCP or UDP packets over IPv6. These are specifically
 *                        unencapsulated packets of the form IPv6|TCP or
 *                        IPv4|UDP where the Next Header field in the IPv6
 *                        header is either TCP or UDP. IPv6 extension headers
 *                        are not supported with this feature. This feature
 *                        cannot be set in features for a device with
 *                        NETIF_F_HW_CSUM also set. This feature is being
 *                        DEPRECATED (see below).
 *
 *      NETIF_F_RXCSUM - Driver (device) performs receive checksum offload.
 *                       This flag is used only used to disable the RX checksum
 *                       feature for a device. The stack will accept receive
 *                       checksum indication in packets received on a device
 *                       regardless of whether NETIF_F_RXCSUM is set.
 *
 * B. Checksumming of received packets by device. Indication of checksum
 *    verification is in set skb->ip_summed. Possible values are:
 *
 * CHECKSUM_NONE:
 *
 *   Device did not checksum this packet e.g. due to lack of capabilities.
 *   The packet contains full (though not verified) checksum in packet but
 *   not in skb->csum. Thus, skb->csum is undefined in this case.
 *
 * CHECKSUM_UNNECESSARY:
 *
 *   The hardware you're dealing with doesn't calculate the full checksum
 *   (as in CHECKSUM_COMPLETE), but it does parse headers and verify checksums
 *   for specific protocols. For such packets it will set CHECKSUM_UNNECESSARY
 *   if their checksums are okay. skb->csum is still undefined in this case
 *   though. A driver or device must never modify the checksum field in the
 *   packet even if checksum is verified.
 *
 *   CHECKSUM_UNNECESSARY is applicable to following protocols:
 *     TCP: IPv6 and IPv4.
 *     UDP: IPv4 and IPv6. A device may apply CHECKSUM_UNNECESSARY to a
 *       zero UDP checksum for either IPv4 or IPv6, the networking stack
 *       may perform further validation in this case.
 *     GRE: only if the checksum is present in the header.
 *     SCTP: indicates the CRC in SCTP header has been validated.
 *     FCOE: indicates the CRC in FC frame has been validated.
 *
 *   skb->csum_level indicates the number of consecutive checksums found in
 *   the packet minus one that have been verified as CHECKSUM_UNNECESSARY.
 *   For instance if a device receives an IPv6->UDP->GRE->IPv4->TCP packet
 *   and a device is able to verify the checksums for UDP (possibly zero),
 *   GRE (checksum flag is set), and TCP-- skb->csum_level would be set to
 *   two. If the device were only able to verify the UDP checksum and not
 *   GRE, either because it doesn't support GRE checksum of because GRE
 *   checksum is bad, skb->csum_level would be set to zero (TCP checksum is
 *   not considered in this case).
 *
 * CHECKSUM_COMPLETE:
 *
 *   This is the most generic way. The device supplied checksum of the _whole_
 *   packet as seen by netif_rx() and fills out in skb->csum. Meaning, the
 *   hardware doesn't need to parse L3/L4 headers to implement this.
 *
 *   Notes:
 *   - Even if device supports only some protocols, but is able to produce
 *     skb->csum, it MUST use CHECKSUM_COMPLETE, not CHECKSUM_UNNECESSARY.
 *   - CHECKSUM_COMPLETE is not applicable to SCTP and FCoE protocols.
 *
 * CHECKSUM_PARTIAL:
 *
 *   A checksum is set up to be offloaded to a device as described in the
 *   output description for CHECKSUM_PARTIAL. This may occur on a packet
 *   received directly from another Linux OS, e.g., a virtualized Linux kernel
 *   on the same host, or it may be set in the input path in GRO or remote
 *   checksum offload. For the purposes of checksum verification, the checksum
 *   referred to by skb->csum_start + skb->csum_offset and any preceding
 *   checksums in the packet are considered verified. Any checksums in the
 *   packet that are after the checksum being offloaded are not considered to
 *   be verified.
 *
 * C. Checksumming on transmit for non-GSO. The stack requests checksum offload
 *    in the skb->ip_summed for a packet. Values are:
 *
 * CHECKSUM_PARTIAL:
 *
 *   The driver is required to checksum the packet as seen by hard_start_xmit()
 *   from skb->csum_start up to the end, and to record/write the checksum at
 *   offset skb->csum_start + skb->csum_offset. A driver may verify that the
 *   csum_start and csum_offset values are valid values given the length and
 *   offset of the packet, however they should not attempt to validate that the
 *   checksum refers to a legitimate transport layer checksum-- it is the
 *   purview of the stack to validate that csum_start and csum_offset are set
 *   correctly.
 *
 *   When the stack requests checksum offload for a packet, the driver MUST
 *   ensure that the checksum is set correctly. A driver can either offload the
 *   checksum calculation to the device, or call skb_checksum_help (in the case
 *   that the device does not support offload for a particular checksum).
 *
 *   NETIF_F_IP_CSUM and NETIF_F_IPV6_CSUM are being deprecated in favor of
 *   NETIF_F_HW_CSUM. New devices should use NETIF_F_HW_CSUM to indicate
 *   checksum offload capability.
 *   skb_csum_hwoffload_help() can be called to resolve CHECKSUM_PARTIAL based
 *   on network device checksumming capabilities: if a packet does not match
 *   them, skb_checksum_help or skb_crc32c_help (depending on the value of
 *   csum_not_inet, see item D.) is called to resolve the checksum.
 *
 * CHECKSUM_NONE:
 *
 *   The skb was already checksummed by the protocol, or a checksum is not
 *   required.
 *
 * CHECKSUM_UNNECESSARY:
 *
 *   This has the same meaning on as CHECKSUM_NONE for checksum offload on
 *   output.
 *
 * CHECKSUM_COMPLETE:
 *   Not used in checksum output. If a driver observes a packet with this value
 *   set in skbuff, if should treat as CHECKSUM_NONE being set.
 *
 * D. Non-IP checksum (CRC) offloads
 *
 *   NETIF_F_SCTP_CRC - This feature indicates that a device is capable of
 *     offloading the SCTP CRC in a packet. To perform this offload the stack
 *     will set set csum_start and csum_offset accordingly, set ip_summed to
 *     CHECKSUM_PARTIAL and set csum_not_inet to 1, to provide an indication in
 *     the skbuff that the CHECKSUM_PARTIAL refers to CRC32c.
 *     A driver that supports both IP checksum offload and SCTP CRC32c offload
 *     must verify which offload is configured for a packet by testing the
 *     value of skb->csum_not_inet; skb_crc32c_csum_help is provided to resolve
 *     CHECKSUM_PARTIAL on skbs where csum_not_inet is set to 1.
 *
 *   NETIF_F_FCOE_CRC - This feature indicates that a device is capable of
 *     offloading the FCOE CRC in a packet. To perform this offload the stack
 *     will set ip_summed to CHECKSUM_PARTIAL and set csum_start and csum_offset
 *     accordingly. Note the there is no indication in the skbuff that the
 *     CHECKSUM_PARTIAL refers to an FCOE checksum, a driver that supports
 *     both IP checksum offload and FCOE CRC offload must verify which offload
 *     is configured for a packet presumably by inspecting packet headers.
 *
 * E. Checksumming on output with GSO.
 *
 * In the case of a GSO packet (skb_is_gso(skb) is true), checksum offload
 * is implied by the SKB_GSO_* flags in gso_type. Most obviously, if the
 * gso_type is SKB_GSO_TCPV4 or SKB_GSO_TCPV6, TCP checksum offload as
 * part of the GSO operation is implied. If a checksum is being offloaded
 * with GSO then ip_summed is CHECKSUM_PARTIAL, csum_start and csum_offset
 * are set to refer to the outermost checksum being offload (two offloaded
 * checksums are possible with UDP encapsulation).
 */

/* Don't change this without changing skb_csum_unnecessary! */

#define CHECKSUM_NONE		0

#define CHECKSUM_UNNECESSARY	1

#define CHECKSUM_COMPLETE	2

#define CHECKSUM_PARTIAL	3

/* Maximum value in skb->csum_level */

#define SKB_MAX_CSUM_LEVEL	3


#define SKB_DATA_ALIGN(X)	ALIGN(X, SMP_CACHE_BYTES)

#define SKB_WITH_OVERHEAD(X)	\
	((X) - SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))

#define SKB_MAX_ORDER(X, ORDER) \
	SKB_WITH_OVERHEAD((PAGE_SIZE << (ORDER)) - (X))

#define SKB_MAX_HEAD(X)		(SKB_MAX_ORDER((X), 0))

#define SKB_MAX_ALLOC		(SKB_MAX_ORDER(0, 2))

/* return minimum truesize of one skb containing X bytes of data */

#define SKB_TRUESIZE(X) ((X) +                                          \
                         SKB_DATA_ALIGN(sizeof(struct sk_buff)) +       \
                         SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))

struct net_device;
struct scatterlist;
struct pipe_inode_info;
struct iov_iter;
struct napi_struct;

#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)

struct nf_conntrack {
	
atomic_t use;
};
#endif

#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)

struct nf_bridge_info {
	
refcount_t		use;
	enum {
		
BRNF_PROTO_UNCHANGED,
		
BRNF_PROTO_8021Q,
		
BRNF_PROTO_PPPOE
	
} orig_proto:8;
	
u8			pkt_otherhost:1;
	
u8			in_prerouting:1;
	
u8			bridged_dnat:1;
	
__u16			frag_max_size;
	
struct net_device	*physindev;

	/* always valid & non-NULL from FORWARD on, for physdev match */
	
struct net_device	*physoutdev;
	union {
		/* prerouting: detect dnat in orig/reply direction */
		
__be32          ipv4_daddr;
		
struct in6_addr ipv6_daddr;

		/* after prerouting + nat detected: store original source
                 * mac since neigh resolution overwrites it, only used while
                 * skb is out in neigh layer.
                 */
		
char neigh_header[8];
	};
};
#endif


struct sk_buff_head {
	/* These two members must be first. */
	
struct sk_buff	*next;
	
struct sk_buff	*prev;

	
__u32		qlen;
	
spinlock_t	lock;
};

struct sk_buff;

/* To allow 64K frame to be packed as single skb without frag_list we
 * require 64K/PAGE_SIZE pages plus 1 additional page to allow for
 * buffers which do not start on a page boundary.
 *
 * Since GRO uses frags we allocate at least 16 regardless of page
 * size.
 */
#if (65536/PAGE_SIZE + 1) < 16

#define MAX_SKB_FRAGS 16UL
#else

#define MAX_SKB_FRAGS (65536/PAGE_SIZE + 1)
#endif
extern int sysctl_max_skb_frags;

/* Set skb_shinfo(skb)->gso_size to this in case you want skb_segment to
 * segment using its current segmentation instead.
 */

#define GSO_BY_FRAGS	0xFFFF


typedef struct skb_frag_struct skb_frag_t;


struct skb_frag_struct {
	struct {
		
struct page *p;
	
} page;
#if (BITS_PER_LONG > 32) || (PAGE_SIZE >= 65536)
	
__u32 page_offset;
	
__u32 size;
#else
	
__u16 page_offset;
	
__u16 size;
#endif
};


static inline unsigned int skb_frag_size(const skb_frag_t *frag) { return frag->size; }

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static inline void skb_frag_size_set(skb_frag_t *frag, unsigned int size) { frag->size = size; }

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static inline void skb_frag_size_add(skb_frag_t *frag, int delta) { frag->size += delta; }

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static inline void skb_frag_size_sub(skb_frag_t *frag, int delta) { frag->size -= delta; }

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static inline bool skb_frag_must_loop(struct page *p) { #if defined(CONFIG_HIGHMEM) if (PageHighMem(p)) return true; #endif return false; }

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/** * skb_frag_foreach_page - loop over pages in a fragment * * @f: skb frag to operate on * @f_off: offset from start of f->page.p * @f_len: length from f_off to loop over * @p: (temp var) current page * @p_off: (temp var) offset from start of current page, * non-zero only on first page. * @p_len: (temp var) length in current page, * < PAGE_SIZE only on first and last page. * @copied: (temp var) length so far, excluding current p_len. * * A fragment can hold a compound page, in which case per-page * operations, notably kmap_atomic, must be called for each * regular page. */ #define skb_frag_foreach_page(f, f_off, f_len, p, p_off, p_len, copied) \ for (p = skb_frag_page(f) + ((f_off) >> PAGE_SHIFT), \ p_off = (f_off) & (PAGE_SIZE - 1), \ p_len = skb_frag_must_loop(p) ? \ min_t(u32, f_len, PAGE_SIZE - p_off) : f_len, \ copied = 0; \ copied < f_len; \ copied += p_len, p++, p_off = 0, \ p_len = min_t(u32, f_len - copied, PAGE_SIZE)) \ #define HAVE_HW_TIME_STAMP /** * struct skb_shared_hwtstamps - hardware time stamps * @hwtstamp: hardware time stamp transformed into duration * since arbitrary point in time * * Software time stamps generated by ktime_get_real() are stored in * skb->tstamp. * * hwtstamps can only be compared against other hwtstamps from * the same device. * * This structure is attached to packets as part of the * &skb_shared_info. Use skb_hwtstamps() to get a pointer. */ struct skb_shared_hwtstamps { ktime_t hwtstamp; }; /* Definitions for tx_flags in struct skb_shared_info */ enum { /* generate hardware time stamp */ SKBTX_HW_TSTAMP = 1 << 0, /* generate software time stamp when queueing packet to NIC */ SKBTX_SW_TSTAMP = 1 << 1, /* device driver is going to provide hardware time stamp */ SKBTX_IN_PROGRESS = 1 << 2, /* device driver supports TX zero-copy buffers */ SKBTX_DEV_ZEROCOPY = 1 << 3, /* generate wifi status information (where possible) */ SKBTX_WIFI_STATUS = 1 << 4, /* This indicates at least one fragment might be overwritten * (as in vmsplice(), sendfile() ...) * If we need to compute a TX checksum, we'll need to copy * all frags to avoid possible bad checksum */ SKBTX_SHARED_FRAG = 1 << 5, /* generate software time stamp when entering packet scheduling */ SKBTX_SCHED_TSTAMP = 1 << 6, }; #define SKBTX_ZEROCOPY_FRAG (SKBTX_DEV_ZEROCOPY | SKBTX_SHARED_FRAG) #define SKBTX_ANY_SW_TSTAMP (SKBTX_SW_TSTAMP | \ SKBTX_SCHED_TSTAMP) #define SKBTX_ANY_TSTAMP (SKBTX_HW_TSTAMP | SKBTX_ANY_SW_TSTAMP) /* * The callback notifies userspace to release buffers when skb DMA is done in * lower device, the skb last reference should be 0 when calling this. * The zerocopy_success argument is true if zero copy transmit occurred, * false on data copy or out of memory error caused by data copy attempt. * The ctx field is used to track device context. * The desc field is used to track userspace buffer index. */ struct ubuf_info { void (*callback)(struct ubuf_info *, bool zerocopy_success); union { struct { unsigned long desc; void *ctx; }; struct { u32 id; u16 len; u16 zerocopy:1; u32 bytelen; }; }; refcount_t refcnt; struct mmpin { struct user_struct *user; unsigned int num_pg; } mmp; }; #define skb_uarg(SKB) ((struct ubuf_info *)(skb_shinfo(SKB)->destructor_arg)) struct ubuf_info *sock_zerocopy_alloc(struct sock *sk, size_t size); struct ubuf_info *sock_zerocopy_realloc(struct sock *sk, size_t size, struct ubuf_info *uarg);
static inline void sock_zerocopy_get(struct ubuf_info *uarg) { refcount_inc(&uarg->refcnt); }

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void sock_zerocopy_put(struct ubuf_info *uarg); void sock_zerocopy_put_abort(struct ubuf_info *uarg); void sock_zerocopy_callback(struct ubuf_info *uarg, bool success); int skb_zerocopy_iter_stream(struct sock *sk, struct sk_buff *skb, struct msghdr *msg, int len, struct ubuf_info *uarg); /* This data is invariant across clones and lives at * the end of the header data, ie. at skb->end. */ struct skb_shared_info { __u8 __unused; __u8 meta_len; __u8 nr_frags; __u8 tx_flags; unsigned short gso_size; /* Warning: this field is not always filled in (UFO)! */ unsigned short gso_segs; struct sk_buff *frag_list; struct skb_shared_hwtstamps hwtstamps; unsigned int gso_type; u32 tskey; /* * Warning : all fields before dataref are cleared in __alloc_skb() */ atomic_t dataref; /* Intermediate layers must ensure that destructor_arg * remains valid until skb destructor */ void * destructor_arg; /* must be last field, see pskb_expand_head() */ skb_frag_t frags[MAX_SKB_FRAGS]; }; /* We divide dataref into two halves. The higher 16 bits hold references * to the payload part of skb->data. The lower 16 bits hold references to * the entire skb->data. A clone of a headerless skb holds the length of * the header in skb->hdr_len. * * All users must obey the rule that the skb->data reference count must be * greater than or equal to the payload reference count. * * Holding a reference to the payload part means that the user does not * care about modifications to the header part of skb->data. */ #define SKB_DATAREF_SHIFT 16 #define SKB_DATAREF_MASK ((1 << SKB_DATAREF_SHIFT) - 1) enum { SKB_FCLONE_UNAVAILABLE, /* skb has no fclone (from head_cache) */ SKB_FCLONE_ORIG, /* orig skb (from fclone_cache) */ SKB_FCLONE_CLONE, /* companion fclone skb (from fclone_cache) */ }; enum { SKB_GSO_TCPV4 = 1 << 0, /* This indicates the skb is from an untrusted source. */ SKB_GSO_DODGY = 1 << 1, /* This indicates the tcp segment has CWR set. */ SKB_GSO_TCP_ECN = 1 << 2, SKB_GSO_TCP_FIXEDID = 1 << 3, SKB_GSO_TCPV6 = 1 << 4, SKB_GSO_FCOE = 1 << 5, SKB_GSO_GRE = 1 << 6, SKB_GSO_GRE_CSUM = 1 << 7, SKB_GSO_IPXIP4 = 1 << 8, SKB_GSO_IPXIP6 = 1 << 9, SKB_GSO_UDP_TUNNEL = 1 << 10, SKB_GSO_UDP_TUNNEL_CSUM = 1 << 11, SKB_GSO_PARTIAL = 1 << 12, SKB_GSO_TUNNEL_REMCSUM = 1 << 13, SKB_GSO_SCTP = 1 << 14, SKB_GSO_ESP = 1 << 15, SKB_GSO_UDP = 1 << 16, }; #if BITS_PER_LONG > 32 #define NET_SKBUFF_DATA_USES_OFFSET 1 #endif #ifdef NET_SKBUFF_DATA_USES_OFFSET typedef unsigned int sk_buff_data_t; #else typedef unsigned char *sk_buff_data_t; #endif /** * struct sk_buff - socket buffer * @next: Next buffer in list * @prev: Previous buffer in list * @tstamp: Time we arrived/left * @rbnode: RB tree node, alternative to next/prev for netem/tcp * @sk: Socket we are owned by * @dev: Device we arrived on/are leaving by * @cb: Control buffer. Free for use by every layer. Put private vars here * @_skb_refdst: destination entry (with norefcount bit) * @sp: the security path, used for xfrm * @len: Length of actual data * @data_len: Data length * @mac_len: Length of link layer header * @hdr_len: writable header length of cloned skb * @csum: Checksum (must include start/offset pair) * @csum_start: Offset from skb->head where checksumming should start * @csum_offset: Offset from csum_start where checksum should be stored * @priority: Packet queueing priority * @ignore_df: allow local fragmentation * @cloned: Head may be cloned (check refcnt to be sure) * @ip_summed: Driver fed us an IP checksum * @nohdr: Payload reference only, must not modify header * @pkt_type: Packet class * @fclone: skbuff clone status * @ipvs_property: skbuff is owned by ipvs * @tc_skip_classify: do not classify packet. set by IFB device * @tc_at_ingress: used within tc_classify to distinguish in/egress * @tc_redirected: packet was redirected by a tc action * @tc_from_ingress: if tc_redirected, tc_at_ingress at time of redirect * @peeked: this packet has been seen already, so stats have been * done for it, don't do them again * @nf_trace: netfilter packet trace flag * @protocol: Packet protocol from driver * @destructor: Destruct function * @tcp_tsorted_anchor: list structure for TCP (tp->tsorted_sent_queue) * @_nfct: Associated connection, if any (with nfctinfo bits) * @nf_bridge: Saved data about a bridged frame - see br_netfilter.c * @skb_iif: ifindex of device we arrived on * @tc_index: Traffic control index * @hash: the packet hash * @queue_mapping: Queue mapping for multiqueue devices * @xmit_more: More SKBs are pending for this queue * @ndisc_nodetype: router type (from link layer) * @ooo_okay: allow the mapping of a socket to a queue to be changed * @l4_hash: indicate hash is a canonical 4-tuple hash over transport * ports. * @sw_hash: indicates hash was computed in software stack * @wifi_acked_valid: wifi_acked was set * @wifi_acked: whether frame was acked on wifi or not * @no_fcs: Request NIC to treat last 4 bytes as Ethernet FCS * @csum_not_inet: use CRC32c to resolve CHECKSUM_PARTIAL * @dst_pending_confirm: need to confirm neighbour * @napi_id: id of the NAPI struct this skb came from * @secmark: security marking * @mark: Generic packet mark * @vlan_proto: vlan encapsulation protocol * @vlan_tci: vlan tag control information * @inner_protocol: Protocol (encapsulation) * @inner_transport_header: Inner transport layer header (encapsulation) * @inner_network_header: Network layer header (encapsulation) * @inner_mac_header: Link layer header (encapsulation) * @transport_header: Transport layer header * @network_header: Network layer header * @mac_header: Link layer header * @tail: Tail pointer * @end: End pointer * @head: Head of buffer * @data: Data head pointer * @truesize: Buffer size * @users: User count - see {datagram,tcp}.c */ struct sk_buff { union { struct { /* These two members must be first. */ struct sk_buff *next; struct sk_buff *prev; union { struct net_device *dev; /* Some protocols might use this space to store information, * while device pointer would be NULL. * UDP receive path is one user. */ unsigned long dev_scratch; }; }; struct rb_node rbnode; /* used in netem & tcp stack */ }; struct sock *sk; union { ktime_t tstamp; u64 skb_mstamp; }; /* * This is the control buffer. It is free to use for every * layer. Please put your private variables there. If you * want to keep them across layers you have to do a skb_clone() * first. This is owned by whoever has the skb queued ATM. */ char cb[48] __aligned(8); union { struct { unsigned long _skb_refdst; void (*destructor)(struct sk_buff *skb); }; struct list_head tcp_tsorted_anchor; }; #ifdef CONFIG_XFRM struct sec_path *sp; #endif #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) unsigned long _nfct; #endif #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) struct nf_bridge_info *nf_bridge; #endif unsigned int len, data_len; __u16 mac_len, hdr_len; /* Following fields are _not_ copied in __copy_skb_header() * Note that queue_mapping is here mostly to fill a hole. */ __u16 queue_mapping; /* if you move cloned around you also must adapt those constants */ #ifdef __BIG_ENDIAN_BITFIELD #define CLONED_MASK (1 << 7) #else #define CLONED_MASK 1 #endif #define CLONED_OFFSET() offsetof(struct sk_buff, __cloned_offset) __u8 __cloned_offset[0]; __u8 cloned:1, nohdr:1, fclone:2, peeked:1, head_frag:1, xmit_more:1, __unused:1; /* one bit hole */ /* fields enclosed in headers_start/headers_end are copied * using a single memcpy() in __copy_skb_header() */ /* private: */ __u32 headers_start[0]; /* public: */ /* if you move pkt_type around you also must adapt those constants */ #ifdef __BIG_ENDIAN_BITFIELD #define PKT_TYPE_MAX (7 << 5) #else #define PKT_TYPE_MAX 7 #endif #define PKT_TYPE_OFFSET() offsetof(struct sk_buff, __pkt_type_offset) __u8 __pkt_type_offset[0]; __u8 pkt_type:3; __u8 pfmemalloc:1; __u8 ignore_df:1; __u8 nf_trace:1; __u8 ip_summed:2; __u8 ooo_okay:1; __u8 l4_hash:1; __u8 sw_hash:1; __u8 wifi_acked_valid:1; __u8 wifi_acked:1; __u8 no_fcs:1; /* Indicates the inner headers are valid in the skbuff. */ __u8 encapsulation:1; __u8 encap_hdr_csum:1; __u8 csum_valid:1; __u8 csum_complete_sw:1; __u8 csum_level:2; __u8 csum_not_inet:1; __u8 dst_pending_confirm:1; #ifdef CONFIG_IPV6_NDISC_NODETYPE __u8 ndisc_nodetype:2; #endif __u8 ipvs_property:1; __u8 inner_protocol_type:1; __u8 remcsum_offload:1; #ifdef CONFIG_NET_SWITCHDEV __u8 offload_fwd_mark:1; __u8 offload_mr_fwd_mark:1; #endif #ifdef CONFIG_NET_CLS_ACT __u8 tc_skip_classify:1; __u8 tc_at_ingress:1; __u8 tc_redirected:1; __u8 tc_from_ingress:1; #endif #ifdef CONFIG_NET_SCHED __u16 tc_index; /* traffic control index */ #endif union { __wsum csum; struct { __u16 csum_start; __u16 csum_offset; }; }; __u32 priority; int skb_iif; __u32 hash; __be16 vlan_proto; __u16 vlan_tci; #if defined(CONFIG_NET_RX_BUSY_POLL) || defined(CONFIG_XPS) union { unsigned int napi_id; unsigned int sender_cpu; }; #endif #ifdef CONFIG_NETWORK_SECMARK __u32 secmark; #endif union { __u32 mark; __u32 reserved_tailroom; }; union { __be16 inner_protocol; __u8 inner_ipproto; }; __u16 inner_transport_header; __u16 inner_network_header; __u16 inner_mac_header; __be16 protocol; __u16 transport_header; __u16 network_header; __u16 mac_header; /* private: */ __u32 headers_end[0]; /* public: */ /* These elements must be at the end, see alloc_skb() for details. */ sk_buff_data_t tail; sk_buff_data_t end; unsigned char *head, *data; unsigned int truesize; refcount_t users; }; #ifdef __KERNEL__ /* * Handling routines are only of interest to the kernel */ #include <linux/slab.h> #define SKB_ALLOC_FCLONE 0x01 #define SKB_ALLOC_RX 0x02 #define SKB_ALLOC_NAPI 0x04 /* Returns true if the skb was allocated from PFMEMALLOC reserves */
static inline bool skb_pfmemalloc(const struct sk_buff *skb) { return unlikely(skb->pfmemalloc); }

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Mel Gorman21100.00%1100.00%
Total21100.00%1100.00%

/* * skb might have a dst pointer attached, refcounted or not. * _skb_refdst low order bit is set if refcount was _not_ taken */ #define SKB_DST_NOREF 1UL #define SKB_DST_PTRMASK ~(SKB_DST_NOREF) #define SKB_NFCT_PTRMASK ~(7UL) /** * skb_dst - returns skb dst_entry * @skb: buffer * * Returns skb dst_entry, regardless of reference taken or not. */
static inline struct dst_entry *skb_dst(const struct sk_buff *skb) { /* If refdst was not refcounted, check we still are in a * rcu_read_lock section */ WARN_ON((skb->_skb_refdst & SKB_DST_NOREF) && !rcu_read_lock_held() && !rcu_read_lock_bh_held()); return (struct dst_entry *)(skb->_skb_refdst & SKB_DST_PTRMASK); }

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Eric Dumazet49100.00%2100.00%
Total49100.00%2100.00%

/** * skb_dst_set - sets skb dst * @skb: buffer * @dst: dst entry * * Sets skb dst, assuming a reference was taken on dst and should * be released by skb_dst_drop() */
static inline void skb_dst_set(struct sk_buff *skb, struct dst_entry *dst) { skb->_skb_refdst = (unsigned long)dst; }

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Eric Dumazet27100.00%2100.00%
Total27100.00%2100.00%

/** * skb_dst_set_noref - sets skb dst, hopefully, without taking reference * @skb: buffer * @dst: dst entry * * Sets skb dst, assuming a reference was not taken on dst. * If dst entry is cached, we do not take reference and dst_release * will be avoided by refdst_drop. If dst entry is not cached, we take * reference, so that last dst_release can destroy the dst immediately. */
static inline void skb_dst_set_noref(struct sk_buff *skb, struct dst_entry *dst) { WARN_ON(!rcu_read_lock_held() && !rcu_read_lock_bh_held()); skb->_skb_refdst = (unsigned long)dst | SKB_DST_NOREF; }

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Julian Anastasov2357.50%150.00%
Hannes Frederic Sowa1742.50%150.00%
Total40100.00%2100.00%

/** * skb_dst_is_noref - Test if skb dst isn't refcounted * @skb: buffer */
static inline bool skb_dst_is_noref(const struct sk_buff *skb) { return (skb->_skb_refdst & SKB_DST_NOREF) && skb_dst(skb); }

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Eric Dumazet27100.00%1100.00%
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static inline struct rtable *skb_rtable(const struct sk_buff *skb) { return (struct rtable *)skb_dst(skb); }

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Eric Dumazet26100.00%2100.00%
Total26100.00%2100.00%

/* For mangling skb->pkt_type from user space side from applications * such as nft, tc, etc, we only allow a conservative subset of * possible pkt_types to be set. */
static inline bool skb_pkt_type_ok(u32 ptype) { return ptype <= PACKET_OTHERHOST; }

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Jamal Hadi Salim15100.00%1100.00%
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static inline unsigned int skb_napi_id(const struct sk_buff *skb) { #ifdef CONFIG_NET_RX_BUSY_POLL return skb->napi_id; #else return 0; #endif }

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Miroslav Lichvar29100.00%1100.00%
Total29100.00%1100.00%

/* decrement the reference count and return true if we can free the skb */
static inline bool skb_unref(struct sk_buff *skb) { if (unlikely(!skb)) return false; if (likely(refcount_read(&skb->users) == 1)) smp_rmb(); else if (likely(!refcount_dec_and_test(&skb->users))) return false; return true; }

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Paolo Abeni6096.77%150.00%
Elena Reshetova23.23%150.00%
Total62100.00%2100.00%

void skb_release_head_state(struct sk_buff *skb); void kfree_skb(struct sk_buff *skb); void kfree_skb_list(struct sk_buff *segs); void skb_tx_error(struct sk_buff *skb); void consume_skb(struct sk_buff *skb); void __consume_stateless_skb(struct sk_buff *skb); void __kfree_skb(struct sk_buff *skb); extern struct kmem_cache *skbuff_head_cache; void kfree_skb_partial(struct sk_buff *skb, bool head_stolen); bool skb_try_coalesce(struct sk_buff *to, struct sk_buff *from, bool *fragstolen, int *delta_truesize); struct sk_buff *__alloc_skb(unsigned int size, gfp_t priority, int flags, int node); struct sk_buff *__build_skb(void *data, unsigned int frag_size); struct sk_buff *build_skb(void *data, unsigned int frag_size);
static inline struct sk_buff *alloc_skb(unsigned int size, gfp_t priority) { return __alloc_skb(size, priority, 0, NUMA_NO_NODE); }

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David S. Miller2589.29%125.00%
Christoph Hellwig13.57%125.00%
Eric Dumazet13.57%125.00%
Al Viro13.57%125.00%
Total28100.00%4100.00%

struct sk_buff *alloc_skb_with_frags(unsigned long header_len, unsigned long data_len, int max_page_order, int *errcode, gfp_t gfp_mask); /* Layout of fast clones : [skb1][skb2][fclone_ref] */ struct sk_buff_fclones { struct sk_buff skb1; struct sk_buff skb2; refcount_t fclone_ref; }; /** * skb_fclone_busy - check if fclone is busy * @sk: socket * @skb: buffer * * Returns true if skb is a fast clone, and its clone is not freed. * Some drivers call skb_orphan() in their ndo_start_xmit(), * so we also check that this didnt happen. */
static inline bool skb_fclone_busy(const struct sock *sk, const struct sk_buff *skb) { const struct sk_buff_fclones *fclones; fclones = container_of(skb, struct sk_buff_fclones, skb1); return skb->fclone == SKB_FCLONE_ORIG && refcount_read(&fclones->fclone_ref) > 1 && fclones->skb2.sk == sk; }

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Eric Dumazet6198.39%375.00%
Elena Reshetova11.61%125.00%
Total62100.00%4100.00%


static inline struct sk_buff *alloc_skb_fclone(unsigned int size, gfp_t priority) { return __alloc_skb(size, priority, SKB_ALLOC_FCLONE, NUMA_NO_NODE); }

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David S. Miller2485.71%120.00%
Eric Dumazet13.57%120.00%
Christoph Hellwig13.57%120.00%
Mel Gorman13.57%120.00%
Al Viro13.57%120.00%
Total28100.00%5100.00%

struct sk_buff *skb_morph(struct sk_buff *dst, struct sk_buff *src); int skb_copy_ubufs(struct sk_buff *skb, gfp_t gfp_mask); struct sk_buff *skb_clone(struct sk_buff *skb, gfp_t priority); struct sk_buff *skb_copy(const struct sk_buff *skb, gfp_t priority); struct sk_buff *__pskb_copy_fclone(struct sk_buff *skb, int headroom, gfp_t gfp_mask, bool fclone);
static inline struct sk_buff *__pskb_copy(struct sk_buff *skb, int headroom, gfp_t gfp_mask) { return __pskb_copy_fclone(skb, headroom, gfp_mask, false); }

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Octavian Purdila32100.00%1100.00%
Total32100.00%1100.00%

int pskb_expand_head(struct sk_buff *skb, int nhead, int ntail, gfp_t gfp_mask); struct sk_buff *skb_realloc_headroom(struct sk_buff *skb, unsigned int headroom); struct sk_buff *skb_copy_expand(const struct sk_buff *skb, int newheadroom, int newtailroom, gfp_t priority); int __must_check skb_to_sgvec_nomark(struct sk_buff *skb, struct scatterlist *sg, int offset, int len); int __must_check skb_to_sgvec(struct sk_buff *skb, struct scatterlist *sg, int offset, int len); int skb_cow_data(struct sk_buff *skb, int tailbits, struct sk_buff **trailer); int __skb_pad(struct sk_buff *skb, int pad, bool free_on_error); /** * skb_pad - zero pad the tail of an skb * @skb: buffer to pad * @pad: space to pad * * Ensure that a buffer is followed by a padding area that is zero * filled. Used by network drivers which may DMA or transfer data * beyond the buffer end onto the wire. * * May return error in out of memory cases. The skb is freed on error. */
static inline int skb_pad(struct sk_buff *skb, int pad) { return __skb_pad(skb, pad, true); }

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Florian Fainelli25100.00%1100.00%
Total25100.00%1100.00%

#define dev_kfree_skb(a) consume_skb(a) int skb_append_datato_frags(struct sock *sk, struct sk_buff *skb, int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb), void *from, int length); int skb_append_pagefrags(struct sk_buff *skb, struct page *page, int offset, size_t size); struct skb_seq_state { __u32 lower_offset; __u32 upper_offset; __u32 frag_idx; __u32 stepped_offset; struct sk_buff *root_skb; struct sk_buff *cur_skb; __u8 *frag_data; }; void skb_prepare_seq_read(struct sk_buff *skb, unsigned int from, unsigned int to, struct skb_seq_state *st); unsigned int skb_seq_read(unsigned int consumed, const u8 **data, struct skb_seq_state *st); void skb_abort_seq_read(struct skb_seq_state *st); unsigned int skb_find_text(struct sk_buff *skb, unsigned int from, unsigned int to, struct ts_config *config); /* * Packet hash types specify the type of hash in skb_set_hash. * * Hash types refer to the protocol layer addresses which are used to * construct a packet's hash. The hashes are used to differentiate or identify * flows of the protocol layer for the hash type. Hash types are either * layer-2 (L2), layer-3 (L3), or layer-4 (L4). * * Properties of hashes: * * 1) Two packets in different flows have different hash values * 2) Two packets in the same flow should have the same hash value * * A hash at a higher layer is considered to be more specific. A driver should * set the most specific hash possible. * * A driver cannot indicate a more specific hash than the layer at which a hash * was computed. For instance an L3 hash cannot be set as an L4 hash. * * A driver may indicate a hash level which is less specific than the * actual layer the hash was computed on. For instance, a hash computed * at L4 may be considered an L3 hash. This should only be done if the * driver can't unambiguously determine that the HW computed the hash at * the higher layer. Note that the "should" in the second property above * permits this. */ enum pkt_hash_types { PKT_HASH_TYPE_NONE, /* Undefined type */ PKT_HASH_TYPE_L2, /* Input: src_MAC, dest_MAC */ PKT_HASH_TYPE_L3, /* Input: src_IP, dst_IP */ PKT_HASH_TYPE_L4, /* Input: src_IP, dst_IP, src_port, dst_port */ };
static inline void skb_clear_hash(struct sk_buff *skb) { skb->hash = 0; skb->sw_hash = 0; skb->l4_hash = 0; }

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Tom Herbert30100.00%2100.00%
Total30100.00%2100.00%


static inline void skb_clear_hash_if_not_l4(struct sk_buff *skb) { if (!skb->l4_hash) skb_clear_hash(skb); }

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Tom Herbert24100.00%1100.00%
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static inline void __skb_set_hash(struct sk_buff *skb, __u32 hash, bool is_sw, bool is_l4) { skb->l4_hash = is_l4; skb->sw_hash = is_sw; skb->hash = hash; }

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Tom Herbert39100.00%4100.00%
Total39100.00%4100.00%


static inline void skb_set_hash(struct sk_buff *skb, __u32 hash, enum pkt_hash_types type) { /* Used by drivers to set hash from HW */ __skb_set_hash(skb, hash, false, type == PKT_HASH_TYPE_L4); }

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Tom Herbert33100.00%1100.00%
Total33100.00%1100.00%


static inline void __skb_set_sw_hash(struct sk_buff *skb, __u32 hash, bool is_l4) { __skb_set_hash(skb, hash, true, is_l4); }

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Tom Herbert29100.00%1100.00%
Total29100.00%1100.00%

void __skb_get_hash(struct sk_buff *skb); u32 __skb_get_hash_symmetric(const struct sk_buff *skb); u32 skb_get_poff(const struct sk_buff *skb); u32 __skb_get_poff(const struct sk_buff *skb, void *data, const struct flow_keys *keys, int hlen); __be32 __skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto, void *data, int hlen_proto);
static inline __be32 skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto) { return __skb_flow_get_ports(skb, thoff, ip_proto, NULL, 0); }

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Tom Herbert33100.00%1100.00%
Total33100.00%1100.00%

void skb_flow_dissector_init(struct flow_dissector *flow_dissector, const struct flow_dissector_key *key, unsigned int key_count); bool __skb_flow_dissect(const struct sk_buff *skb, struct flow_dissector *flow_dissector, void *target_container, void *data, __be16 proto, int nhoff, int hlen, unsigned int flags);
static inline bool skb_flow_dissect(const struct sk_buff *skb, struct flow_dissector *flow_dissector, void *target_container, unsigned int flags) { return __skb_flow_dissect(skb, flow_dissector, target_container, NULL, 0, 0, 0, flags); }

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Tom Herbert46100.00%2100.00%
Total46100.00%2100.00%


static inline bool skb_flow_dissect_flow_keys(const struct sk_buff *skb, struct flow_keys *flow, unsigned int flags) { memset(flow, 0, sizeof(*flow)); return __skb_flow_dissect(skb, &flow_keys_dissector, flow, NULL, 0, 0, 0, flags); }

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Tom Herbert56100.00%2100.00%
Total56100.00%2100.00%


static inline bool skb_flow_dissect_flow_keys_buf(struct flow_keys *flow, void *data, __be16 proto, int nhoff, int hlen, unsigned int flags) { memset(flow, 0, sizeof(*flow)); return __skb_flow_dissect(NULL, &flow_keys_buf_dissector, flow, data, proto, nhoff, hlen, flags); }

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Tom Herbert63100.00%2100.00%
Total63100.00%2100.00%


static inline __u32 skb_get_hash(struct sk_buff *skb) { if (!skb->l4_hash && !skb->sw_hash) __skb_get_hash(skb); return skb->hash; }

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Krishna Kumar2470.59%120.00%
Tom Herbert1029.41%480.00%
Total34100.00%5100.00%


static inline __u32 skb_get_hash_flowi6(struct sk_buff *skb, const struct flowi6 *fl6) { if (!skb->l4_hash && !skb->sw_hash) { struct flow_keys keys; __u32 hash = __get_hash_from_flowi6(fl6, &keys); __skb_set_sw_hash(skb, hash, flow_keys_have_l4(&keys)); } return skb->hash; }

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Tom Herbert6498.46%375.00%
David S. Miller11.54%125.00%
Total65100.00%4100.00%

__u32 skb_get_hash_perturb(const struct sk_buff *skb, u32 perturb);
static inline __u32 skb_get_hash_raw(const struct sk_buff *skb) { return skb->hash; }

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Tom Herbert1794.44%266.67%
Krishna Kumar15.56%133.33%
Total18100.00%3100.00%


static inline void skb_copy_hash(struct sk_buff *to, const struct sk_buff *from) { to->hash = from->hash; to->sw_hash = from->sw_hash; to->l4_hash = from->l4_hash; }

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Tom Herbert42100.00%3100.00%
Total42100.00%3100.00%

; #ifdef NET_SKBUFF_DATA_USES_OFFSET
static inline unsigned char *skb_end_pointer(const struct sk_buff *skb) { return skb->head + skb->end; }

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Arnaldo Carvalho de Melo24100.00%1100.00%
Total24100.00%1100.00%


static inline unsigned int skb_end_offset(const struct sk_buff *skb) { return skb->end; }

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Alexander Duyck19100.00%1100.00%
Total19100.00%1100.00%

#else
static inline unsigned char *skb_end_pointer(const struct sk_buff *skb) { return skb->end; }

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Arnaldo Carvalho de Melo20100.00%1100.00%
Total20100.00%1100.00%


static inline unsigned int skb_end_offset(const struct sk_buff *skb) { return skb->end - skb->head; }

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Alexander Duyck23100.00%1100.00%
Total23100.00%1100.00%

#endif /* Internal */ #define skb_shinfo(SKB) ((struct skb_shared_info *)(skb_end_pointer(SKB)))
static inline struct skb_shared_hwtstamps *skb_hwtstamps(struct sk_buff *skb) { return &skb_shinfo(skb)->hwtstamps; }

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Patrick Ohly23100.00%1100.00%
Total23100.00%1100.00%


static inline struct ubuf_info *skb_zcopy(struct sk_buff *skb) { bool is_zcopy = skb && skb_shinfo(skb)->tx_flags & SKBTX_DEV_ZEROCOPY; return is_zcopy ? skb_uarg(skb) : NULL; }

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Willem de Bruijn38100.00%1100.00%
Total38100.00%1100.00%


static inline void skb_zcopy_set(struct sk_buff *skb, struct ubuf_info *uarg) { if (skb && uarg && !skb_zcopy(skb)) { sock_zerocopy_get(uarg); skb_shinfo(skb)->destructor_arg = uarg; skb_shinfo(skb)->tx_flags |= SKBTX_ZEROCOPY_FRAG; } }

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Willem de Bruijn54100.00%1100.00%
Total54100.00%1100.00%

/* Release a reference on a zerocopy structure */
static inline void skb_zcopy_clear(struct sk_buff *skb, bool zerocopy) { struct ubuf_info *uarg = skb_zcopy(skb); if (uarg) { if (uarg->callback == sock_zerocopy_callback) { uarg->zerocopy = uarg->zerocopy && zerocopy; sock_zerocopy_put(uarg); } else { uarg->callback(uarg, zerocopy); } skb_shinfo(skb)->tx_flags &= ~SKBTX_ZEROCOPY_FRAG; } }

Contributors

PersonTokensPropCommitsCommitProp
Willem de Bruijn78100.00%2100.00%
Total78100.00%2100.00%

/* Abort a zerocopy operation and revert zckey on error in send syscall */
static inline void skb_zcopy_abort(struct sk_buff *skb) { struct ubuf_info *uarg = skb_zcopy(skb); if (uarg) { sock_zerocopy_put_abort(uarg); skb_shinfo(skb)->tx_flags &= ~SKBTX_ZEROCOPY_FRAG; } }

Contributors

PersonTokensPropCommitsCommitProp
Willem de Bruijn43100.00%1100.00%
Total43100.00%1100.00%

/** * skb_queue_empty - check if a queue is empty * @list: queue head * * Returns true if the queue is empty, false otherwise. */
static inline int skb_queue_empty(const struct sk_buff_head *list) { return list->next == (const struct sk_buff *) list; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)2492.31%250.00%
Stephen Hemminger13.85%125.00%
Daniel Borkmann13.85%125.00%
Total26100.00%4100.00%

/** * skb_queue_is_last - check if skb is the last entry in the queue * @list: queue head * @skb: buffer * * Returns true if @skb is the last buffer on the list. */
static inline bool skb_queue_is_last(const struct sk_buff_head *list, const struct sk_buff *skb) { return skb->next == (const struct sk_buff *) list; }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller3196.88%150.00%
Daniel Borkmann13.12%150.00%
Total32100.00%2100.00%

/** * skb_queue_is_first - check if skb is the first entry in the queue * @list: queue head * @skb: buffer * * Returns true if @skb is the first buffer on the list. */
static inline bool skb_queue_is_first(const struct sk_buff_head *list, const struct sk_buff *skb) { return skb->prev == (const struct sk_buff *) list; }

Contributors

PersonTokensPropCommitsCommitProp
Ilpo Järvinen3196.88%150.00%
Daniel Borkmann13.12%150.00%
Total32100.00%2100.00%

/** * skb_queue_next - return the next packet in the queue * @list: queue head * @skb: current buffer * * Return the next packet in @list after @skb. It is only valid to * call this if skb_queue_is_last() evaluates to false. */
static inline struct sk_buff *skb_queue_next(const struct sk_buff_head *list, const struct sk_buff *skb) { /* This BUG_ON may seem severe, but if we just return then we * are going to dereference garbage. */ BUG_ON(skb_queue_is_last(list, skb)); return skb->next; }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller37100.00%1100.00%
Total37100.00%1100.00%

/** * skb_queue_prev - return the prev packet in the queue * @list: queue head * @skb: current buffer * * Return the prev packet in @list before @skb. It is only valid to * call this if skb_queue_is_first() evaluates to false. */
static inline struct sk_buff *skb_queue_prev(const struct sk_buff_head *list, const struct sk_buff *skb) { /* This BUG_ON may seem severe, but if we just return then we * are going to dereference garbage. */ BUG_ON(skb_queue_is_first(list, skb)); return skb->prev; }

Contributors

PersonTokensPropCommitsCommitProp
Ilpo Järvinen37100.00%1100.00%
Total37100.00%1100.00%

/** * skb_get - reference buffer * @skb: buffer to reference * * Makes another reference to a socket buffer and returns a pointer * to the buffer. */
static inline struct sk_buff *skb_get(struct sk_buff *skb) { refcount_inc(&skb->users); return skb; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)2496.00%266.67%
Elena Reshetova14.00%133.33%
Total25100.00%3100.00%

/* * If users == 1, we are the only owner and can avoid redundant atomic changes. */ /** * skb_cloned - is the buffer a clone * @skb: buffer to check * * Returns true if the buffer was generated with skb_clone() and is * one of multiple shared copies of the buffer. Cloned buffers are * shared data so must not be written to under normal circumstances. */
static inline int skb_cloned(const struct sk_buff *skb) { return skb->cloned && (atomic_read(&skb_shinfo(skb)->dataref) & SKB_DATAREF_MASK) != 1; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)2674.29%457.14%
Herbert Xu411.43%114.29%
Linus Torvalds411.43%114.29%
Stephen Hemminger12.86%114.29%
Total35100.00%7100.00%


static inline int skb_unclone(struct sk_buff *skb, gfp_t pri) { might_sleep_if(gfpflags_allow_blocking(pri)); if (skb_cloned(skb)) return pskb_expand_head(skb, 0, 0, pri); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Pravin B Shelar4293.33%150.00%
Mel Gorman36.67%150.00%
Total45100.00%2100.00%

/** * skb_header_cloned - is the header a clone * @skb: buffer to check * * Returns true if modifying the header part of the buffer requires * the data to be copied. */
static inline int skb_header_cloned(const struct sk_buff *skb) { int dataref; if (!skb->cloned) return 0; dataref = atomic_read(&skb_shinfo(skb)->dataref); dataref = (dataref & SKB_DATAREF_MASK) - (dataref >> SKB_DATAREF_SHIFT); return dataref != 1; }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu58100.00%1100.00%
Total58100.00%1100.00%


static inline int skb_header_unclone(struct sk_buff *skb, gfp_t pri) { might_sleep_if(gfpflags_allow_blocking(pri)); if (skb_header_cloned(skb)) return pskb_expand_head(skb, 0, 0, pri); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Eric Dumazet45100.00%1100.00%
Total45100.00%1100.00%

/** * __skb_header_release - release reference to header * @skb: buffer to operate on */
static inline void __skb_header_release(struct sk_buff *skb) { skb->nohdr = 1; atomic_set(&skb_shinfo(skb)->dataref, 1 + (1 << SKB_DATAREF_SHIFT)); }

Contributors

PersonTokensPropCommitsCommitProp
Eric Dumazet37100.00%1100.00%
Total37100.00%1100.00%

/** * skb_shared - is the buffer shared * @skb: buffer to check * * Returns true if more than one person has a reference to this * buffer. */
static inline int skb_shared(const struct sk_buff *skb) { return refcount_read(&skb->users) != 1; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)2291.67%360.00%
Stephen Hemminger14.17%120.00%
Elena Reshetova14.17%120.00%
Total24100.00%5100.00%

/** * skb_share_check - check if buffer is shared and if so clone it * @skb: buffer to check * @pri: priority for memory allocation * * If the buffer is shared the buffer is cloned and the old copy * drops a reference. A new clone with a single reference is returned. * If the buffer is not shared the original buffer is returned. When * being called from interrupt status or with spinlocks held pri must * be GFP_ATOMIC. * * NULL is returned on a memory allocation failure. */
static inline struct sk_buff *skb_share_check(struct sk_buff *skb, gfp_t pri) { might_sleep_if(gfpflags_allow_blocking(pri)); if (skb_shared(skb)) { struct sk_buff *nskb = skb_clone(skb, pri); if (likely(nskb)) consume_skb(skb); else kfree_skb(skb); skb = nskb; } return skb; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)4461.97%228.57%
Eric Dumazet1318.31%114.29%
Andrew Morton57.04%114.29%
Arnaldo Carvalho de Melo57.04%114.29%
Mel Gorman34.23%114.29%
Al Viro11.41%114.29%
Total71100.00%7100.00%

/* * Copy shared buffers into a new sk_buff. We effectively do COW on * packets to handle cases where we have a local reader and forward * and a couple of other messy ones. The normal one is tcpdumping * a packet thats being forwarded. */ /** * skb_unshare - make a copy of a shared buffer * @skb: buffer to check * @pri: priority for memory allocation * * If the socket buffer is a clone then this function creates a new * copy of the data, drops a reference count on the old copy and returns * the new copy with the reference count at 1. If the buffer is not a clone * the original buffer is returned. When called with a spinlock held or * from interrupt state @pri must be %GFP_ATOMIC * * %NULL is returned on a memory allocation failure. */
static inline struct sk_buff *skb_unshare(struct sk_buff *skb, gfp_t pri) { might_sleep_if(gfpflags_allow_blocking(pri)); if (skb_cloned(skb)) { struct sk_buff *nskb = skb_copy(skb, pri); /* Free our shared copy */ if (likely(nskb)) consume_skb(skb); else kfree_skb(skb); skb = nskb; } return skb; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)3751.39%337.50%
Alexander Aring1419.44%112.50%
Arnaldo Carvalho de Melo1216.67%112.50%
Andrew Morton56.94%112.50%
Mel Gorman34.17%112.50%
Al Viro11.39%112.50%
Total72100.00%8100.00%

/** * skb_peek - peek at the head of an &sk_buff_head * @list_: list to peek at * * Peek an &sk_buff. Unlike most other operations you _MUST_ * be careful with this one. A peek leaves the buffer on the * list and someone else may run off with it. You must hold * the appropriate locks or have a private queue to do this. * * Returns %NULL for an empty list or a pointer to the head element. * The reference count is not incremented and the reference is therefore * volatile. Use with caution. */
static inline struct sk_buff *skb_peek(const struct sk_buff_head *list_) { struct sk_buff *skb = list_->next; if (skb == (struct sk_buff *)list_) skb = NULL; return skb; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)3788.10%466.67%
Eric Dumazet511.90%233.33%
Total42100.00%6100.00%

/** * skb_peek_next - peek skb following the given one from a queue * @skb: skb to start from * @list_: list to peek at * * Returns %NULL when the end of the list is met or a pointer to the * next element. The reference count is not incremented and the * reference is therefore volatile. Use with caution. */
static inline struct sk_buff *skb_peek_next(struct sk_buff *skb, const struct sk_buff_head *list_) { struct sk_buff *next = skb->next; if (next == (struct sk_buff *)list_) next = NULL; return next; }

Contributors

PersonTokensPropCommitsCommitProp
Pavel Emelyanov47100.00%1100.00%
Total47100.00%1100.00%

/** * skb_peek_tail - peek at the tail of an &sk_buff_head * @list_: list to peek at * * Peek an &sk_buff. Unlike most other operations you _MUST_ * be careful with this one. A peek leaves the buffer on the * list and someone else may run off with it. You must hold * the appropriate locks or have a private queue to do this. * * Returns %NULL for an empty list or a pointer to the tail element. * The reference count is not incremented and the reference is therefore * volatile. Use with caution. */
static inline struct sk_buff *skb_peek_tail(const struct sk_buff_head *list_) { struct sk_buff *skb = list_->prev; if (skb == (struct sk_buff *)list_) skb = NULL; return skb; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)3788.10%250.00%
Eric Dumazet511.90%250.00%
Total42100.00%4100.00%

/** * skb_queue_len - get queue length * @list_: list to measure * * Return the length of an &sk_buff queue. */
static inline __u32 skb_queue_len(const struct sk_buff_head *list_) { return list_->qlen; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)1794.44%266.67%
Stephen Hemminger15.56%133.33%
Total18100.00%3100.00%

/** * __skb_queue_head_init - initialize non-spinlock portions of sk_buff_head * @list: queue to initialize * * This initializes only the list and queue length aspects of * an sk_buff_head object. This allows to initialize the list * aspects of an sk_buff_head without reinitializing things like * the spinlock. It can also be used for on-stack sk_buff_head * objects where the spinlock is known to not be used. */
static inline void __skb_queue_head_init(struct sk_buff_head *list) { list->prev = list->next = (struct sk_buff *)list; list->qlen = 0; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)3296.97%375.00%
David S. Miller13.03%125.00%
Total33100.00%4100.00%

/* * This function creates a split out lock class for each invocation; * this is needed for now since a whole lot of users of the skb-queue * infrastructure in drivers have different locking usage (in hardirq) * than the networking core (in softirq only). In the long run either the * network layer or drivers should need annotation to consolidate the * main types of usage into 3 classes. */
static inline void skb_queue_head_init(struct sk_buff_head *list) { spin_lock_init(&list->lock); __skb_queue_head_init(list); }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller25100.00%1100.00%
Total25100.00%1100.00%


static inline void skb_queue_head_init_class(struct sk_buff_head *list, struct lock_class_key *class) { skb_queue_head_init(list); lockdep_set_class(&list->lock, class); }

Contributors

PersonTokensPropCommitsCommitProp
Pavel Emelyanov32100.00%1100.00%
Total32100.00%1100.00%

/* * Insert an sk_buff on a list. * * The "__skb_xxxx()" functions are the non-atomic ones that * can only be called with interrupts disabled. */ void skb_insert(struct sk_buff *old, struct sk_buff *newsk, struct sk_buff_head *list);
static inline void __skb_insert(struct sk_buff *newsk, struct sk_buff *prev, struct sk_buff *next, struct sk_buff_head *list) { newsk->next = next; newsk->prev = prev; next->prev = prev->next = newsk; list->qlen++; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)2953.70%240.00%
Gerrit Renker1425.93%120.00%
Stephen Hemminger1120.37%240.00%
Total54100.00%5100.00%


static inline void __skb_queue_splice(const struct sk_buff_head *list, struct sk_buff *prev, struct sk_buff *next) { struct sk_buff *first = list->next; struct sk_buff *last = list->prev; first->prev = prev; prev->next = first; last->next = next; next->prev = last; }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller65100.00%1100.00%
Total65100.00%1100.00%

/** * skb_queue_splice - join two skb lists, this is designed for stacks * @list: the new list to add * @head: the place to add it in the first list */
static inline void skb_queue_splice(const struct sk_buff_head *list, struct sk_buff_head *head) { if (!skb_queue_empty(list)) { __skb_queue_splice(list, (struct sk_buff *) head, head->next); head->qlen += list->qlen; } }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller52100.00%2100.00%
Total52100.00%2100.00%

/** * skb_queue_splice_init - join two skb lists and reinitialise the emptied list * @list: the new list to add * @head: the place to add it in the first list * * The list at @list is reinitialised */
static inline void skb_queue_splice_init(struct sk_buff_head *list, struct sk_buff_head *head) { if (!skb_queue_empty(list)) { __skb_queue_splice(list, (struct sk_buff *) head, head->next); head->qlen += list->qlen; __skb_queue_head_init(list); } }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller56100.00%2100.00%
Total56100.00%2100.00%

/** * skb_queue_splice_tail - join two skb lists, each list being a queue * @list: the new list to add * @head: the place to add it in the first list */
static inline void skb_queue_splice_tail(const struct sk_buff_head *list, struct sk_buff_head *head) { if (!skb_queue_empty(list)) { __skb_queue_splice(list, head->prev, (struct sk_buff *) head); head->qlen += list->qlen; } }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller52100.00%2100.00%
Total52100.00%2100.00%

/** * skb_queue_splice_tail_init - join two skb lists and reinitialise the emptied list * @list: the new list to add * @head: the place to add it in the first list * * Each of the lists is a queue. * The list at @list is reinitialised */
static inline void skb_queue_splice_tail_init(struct sk_buff_head *list, struct sk_buff_head *head) { if (!skb_queue_empty(list)) { __skb_queue_splice(list, head->prev, (struct sk_buff *) head); head->qlen += list->qlen; __skb_queue_head_init(list); } }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller56100.00%2100.00%
Total56100.00%2100.00%

/** * __skb_queue_after - queue a buffer at the list head * @list: list to use * @prev: place after this buffer * @newsk: buffer to queue * * Queue a buffer int the middle of a list. This function takes no locks * and you must therefore hold required locks before calling it. * * A buffer cannot be placed on two lists at the same time. */
static inline void __skb_queue_after(struct sk_buff_head *list, struct sk_buff *prev, struct sk_buff *newsk) { __skb_insert(newsk, prev, prev->next, list); }

Contributors

PersonTokensPropCommitsCommitProp
Gerrit Renker3497.14%150.00%
Linus Torvalds (pre-git)12.86%150.00%
Total35100.00%2100.00%

void skb_append(struct sk_buff *old, struct sk_buff *newsk, struct sk_buff_head *list);
static inline void __skb_queue_before(struct sk_buff_head *list, struct sk_buff *next, struct sk_buff *newsk) { __skb_insert(newsk, next->prev, next, list); }

Contributors

PersonTokensPropCommitsCommitProp
Gerrit Renker35100.00%1100.00%
Total35100.00%1100.00%

/** * __skb_queue_head - queue a buffer at the list head * @list: list to use * @newsk: buffer to queue * * Queue a buffer at the start of a list. This function takes no locks * and you must therefore hold required locks before calling it. * * A buffer cannot be placed on two lists at the same time. */ void skb_queue_head(struct sk_buff_head *list, struct sk_buff *newsk);
static inline void __skb_queue_head(struct sk_buff_head *list, struct sk_buff *newsk) { __skb_queue_after(list, (struct sk_buff *)list, newsk); }

Contributors

PersonTokensPropCommitsCommitProp
Stephen Hemminger31100.00%1100.00%
Total31100.00%1100.00%

/** * __skb_queue_tail - queue a buffer at the list tail * @list: list to use * @newsk: buffer to queue * * Queue a buffer at the end of a list. This function takes no locks * and you must therefore hold required locks before calling it. * * A buffer cannot be placed on two lists at the same time. */ void skb_queue_tail(struct sk_buff_head *list, struct sk_buff *newsk);
static inline void __skb_queue_tail(struct sk_buff_head *list, struct sk_buff *newsk) { __skb_queue_before(list, (struct sk_buff *)list, newsk); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)2683.87%375.00%
Gerrit Renker516.13%125.00%
Total31100.00%4100.00%

/* * remove sk_buff from list. _Must_ be called atomically, and with * the list known.. */ void skb_unlink(struct sk_buff *skb, struct sk_buff_head *list);
static inline void __skb_unlink(struct sk_buff *skb, struct sk_buff_head *list) { struct sk_buff *next, *prev; list->qlen--; next = skb->next; prev = skb->prev; skb->next = skb->prev = NULL; next->prev = prev; prev->next = next; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)64100.00%5100.00%
Total64100.00%5100.00%

/** * __skb_dequeue - remove from the head of the queue * @list: list to dequeue from * * Remove the head of the list. This function does not take any locks * so must be used with appropriate locks held only. The head item is * returned or %NULL if the list is empty. */ struct sk_buff *skb_dequeue(struct sk_buff_head *list);
static inline struct sk_buff *__skb_dequeue(struct sk_buff_head *list) { struct sk_buff *skb = skb_peek(list); if (skb) __skb_unlink(skb, list); return skb; }

Contributors

PersonTokensPropCommitsCommitProp
Gerrit Renker38100.00%1100.00%
Total38100.00%1100.00%

/** * __skb_dequeue_tail - remove from the tail of the queue * @list: list to dequeue from * * Remove the tail of the list. This function does not take any locks * so must be used with appropriate locks held only. The tail item is * returned or %NULL if the list is empty. */ struct sk_buff *skb_dequeue_tail(struct sk_buff_head *list);
static inline struct sk_buff *__skb_dequeue_tail(struct sk_buff_head *list) { struct sk_buff *skb = skb_peek_tail(list); if (skb) __skb_unlink(skb, list); return skb; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)38100.00%2100.00%
Total38100.00%2100.00%


static inline bool skb_is_nonlinear(const struct sk_buff *skb) { return skb->data_len; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds1794.44%150.00%
David S. Miller15.56%150.00%
Total18100.00%2100.00%


static inline unsigned int skb_headlen(const struct sk_buff *skb) { return skb->len - skb->data_len; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds2295.65%150.00%
Andi Kleen14.35%150.00%
Total23100.00%2100.00%


static inline unsigned int __skb_pagelen(const struct sk_buff *skb) { unsigned int i, len = 0; for (i = skb_shinfo(skb)->nr_frags - 1; (int)i >= 0; i--) len += skb_frag_size(&skb_shinfo(skb)->frags[i]); return len; }

Contributors

PersonTokensPropCommitsCommitProp
Alexey Kuznetsov5281.25%125.00%
Alexey Dobriyan57.81%125.00%
Eric Dumazet46.25%125.00%
Willem de Bruijn34.69%125.00%
Total64100.00%4100.00%


static inline unsigned int skb_pagelen(const struct sk_buff *skb) { return skb_headlen(skb) + __skb_pagelen(skb); }

Contributors

PersonTokensPropCommitsCommitProp
Willem de Bruijn1976.00%150.00%
Alexey Kuznetsov624.00%150.00%
Total25100.00%2100.00%

/** * __skb_fill_page_desc - initialise a paged fragment in an skb * @skb: buffer containing fragment to be initialised * @i: paged fragment index to initialise * @page: the page to use for this fragment * @off: the offset to the data with @page * @size: the length of the data * * Initialises the @i'th fragment of @skb to point to &size bytes at * offset @off within @page. * * Does not take any additional reference on the fragment. */
static inline void __skb_fill_page_desc(struct sk_buff *skb, int i, struct page *page, int off, int size) { skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; /* * Propagate page pfmemalloc to the skb if we can. The problem is * that not all callers have unique ownership of the page but rely * on page_is_pfmemalloc doing the right thing(tm). */ frag->page.p = page; frag->page_offset = off; skb_frag_size_set(frag, size); page = compound_head(page); if (page_is_pfmemalloc(page)) skb->pfmemalloc = true; }

Contributors

PersonTokensPropCommitsCommitProp
Kazunori Miyazawa5465.06%116.67%
Pavel Emelyanov1720.48%116.67%
Michal Hocko44.82%116.67%
Ian Campbell44.82%233.33%
Eric Dumazet44.82%116.67%
Total83100.00%6100.00%

/** * skb_fill_page_desc - initialise a paged fragment in an skb * @skb: buffer containing fragment to be initialised * @i: paged fragment index to initialise * @page: the page to use for this fragment * @off: the offset to the data with @page * @size: the length of the data * * As per __skb_fill_page_desc() -- initialises the @i'th fragment of * @skb to point to @size bytes at offset @off within @page. In * addition updates @skb such that @i is the last fragment. * * Does not take any additional reference on the fragment. */
static inline void skb_fill_page_desc(struct sk_buff *skb, int i, struct page *page, int off, int size) { __skb_fill_page_desc(skb, i, page, off, size); skb_shinfo(skb)->nr_frags = i + 1; }

Contributors

PersonTokensPropCommitsCommitProp
Ian Campbell3876.00%150.00%
Kazunori Miyazawa1224.00%150.00%
Total50100.00%2100.00%

void skb_add_rx_frag(struct sk_buff *skb, int i, struct page *page, int off, int size, unsigned int truesize); void skb_coalesce_rx_frag(struct sk_buff *skb, int i, int size, unsigned int truesize); #define SKB_PAGE_ASSERT(skb) BUG_ON(skb_shinfo(skb)->nr_frags) #define SKB_FRAG_ASSERT(skb) BUG_ON(skb_has_frag_list(skb)) #define SKB_LINEAR_ASSERT(skb) BUG_ON(skb_is_nonlinear(skb)) #ifdef NET_SKBUFF_DATA_USES_OFFSET
static inline unsigned char *skb_tail_pointer(const struct sk_buff *skb) { return skb->head + skb->tail; }

Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo24100.00%1100.00%
Total24100.00%1100.00%


static inline void skb_reset_tail_pointer(struct sk_buff *skb) { skb->tail = skb->data - skb->head; }

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Arnaldo Carvalho de Melo24100.00%1100.00%
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static inline void skb_set_tail_pointer(struct sk_buff *skb, const int offset) { skb_reset_tail_pointer(skb); skb->tail += offset; }

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#else /* NET_SKBUFF_DATA_USES_OFFSET */
static inline unsigned char *skb_tail_pointer(const struct sk_buff *skb) { return skb->tail; }

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static inline void skb_reset_tail_pointer(struct sk_buff *skb) { skb->tail = skb->data; }

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Arnaldo Carvalho de Melo20100.00%1100.00%
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static inline void skb_set_tail_pointer(struct sk_buff *skb, const int offset) { skb->tail = skb->data + offset; }

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Arnaldo Carvalho de Melo26100.00%1100.00%
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#endif /* NET_SKBUFF_DATA_USES_OFFSET */ /* * Add data to an sk_buff */ void *pskb_put(struct sk_buff *skb, struct sk_buff *tail, int len); void *skb_put(struct sk_buff *skb, unsigned int len);
static inline void *__skb_put(struct sk_buff *skb, unsigned int len) { void *tmp = skb_tail_pointer(skb); SKB_LINEAR_ASSERT(skb); skb->tail += len; skb->len += len; return tmp; }

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Linus Torvalds (pre-git)3576.09%342.86%
Linus Torvalds510.87%114.29%
Arnaldo Carvalho de Melo36.52%114.29%
Johannes Berg24.35%114.29%
Ilpo Järvinen12.17%114.29%
Total46100.00%7100.00%


static inline void *__skb_put_zero(struct sk_buff *skb, unsigned int len) { void *tmp = __skb_put(skb, len); memset(tmp, 0, len); return tmp; }

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yuan linyu40100.00%1100.00%
Total40100.00%1100.00%


static inline void *__skb_put_data(struct sk_buff *skb, const void *data, unsigned int len) { void *tmp = __skb_put(skb, len); memcpy(tmp, data, len); return tmp; }

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yuan linyu45100.00%1100.00%
Total45100.00%1100.00%


static inline void __skb_put_u8(struct sk_buff *skb, u8 val) { *(u8 *)__skb_put(skb, 1) = val; }

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yuan linyu29100.00%1100.00%
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static inline void *skb_put_zero(struct sk_buff *skb, unsigned int len) { void *tmp = skb_put(skb, len); memset(tmp, 0, len); return tmp; }

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Johannes Berg40100.00%2100.00%
Total40100.00%2100.00%


static inline void *skb_put_data(struct sk_buff *skb, const void *data, unsigned int len) { void *tmp = skb_put(skb, len); memcpy(tmp, data, len); return tmp; }

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Johannes Berg45100.00%1100.00%
Total45100.00%1100.00%


static inline void skb_put_u8(struct sk_buff *skb, u8 val) { *(u8 *)skb_put(skb, 1) = val; }

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Johannes Berg29100.00%1100.00%
Total29100.00%1100.00%

void *skb_push(struct sk_buff *skb, unsigned int len);
static inline void *__skb_push(struct sk_buff *skb, unsigned int len) { skb->data -= len; skb->len += len; return skb->data; }

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Linus Torvalds (pre-git)3294.12%360.00%
Johannes Berg12.94%120.00%
Ilpo Järvinen12.94%120.00%
Total34100.00%5100.00%

void *skb_pull(struct sk_buff *skb, unsigned int len);
static inline void *__skb_pull(struct sk_buff *skb, unsigned int len) { skb->len -= len; BUG_ON(skb->len < skb->data_len); return skb->data += len; }

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Linus Torvalds (pre-git)2970.73%240.00%
Linus Torvalds819.51%120.00%
Stephen Hemminger37.32%120.00%
Johannes Berg12.44%120.00%
Total41100.00%5100.00%


static inline void *skb_pull_inline(struct sk_buff *skb, unsigned int len) { return unlikely(len > skb->len) ? NULL : __skb_pull(skb, len); }

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David S. Miller3597.22%150.00%
Johannes Berg12.78%150.00%
Total36100.00%2100.00%

void *__pskb_pull_tail(struct sk_buff *skb, int delta);
static inline void *__pskb_pull(struct sk_buff *skb, unsigned int len) { if (len > skb_headlen(skb) && !__pskb_pull_tail(skb, len - skb_headlen(skb))) return NULL; skb->len -= len; return skb->data += len; }

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Linus Torvalds5396.36%133.33%
Johannes Berg11.82%133.33%
Arnaldo Carvalho de Melo11.82%133.33%
Total55100.00%3100.00%


static inline void *pskb_pull(struct sk_buff *skb, unsigned int len) { return unlikely(len > skb->len) ? NULL : __pskb_pull(skb, len); }

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Linus Torvalds2980.56%125.00%
Arnaldo Carvalho de Melo38.33%125.00%
Stephen Hemminger38.33%125.00%
Johannes Berg12.78%125.00%
Total36100.00%4100.00%


static inline int pskb_may_pull(struct sk_buff *skb, unsigned int len) { if (likely(len <= skb_headlen(skb))) return 1; if (unlikely(len > skb->len)) return 0; return __pskb_pull_tail(skb, len - skb_headlen(skb)) != NULL; }

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Linus Torvalds5490.00%150.00%
Stephen Hemminger610.00%150.00%
Total60100.00%2100.00%

void skb_condense(struct sk_buff *skb); /** * skb_headroom - bytes at buffer head * @skb: buffer to check * * Return the number of bytes of free space at the head of an &sk_buff. */
static inline unsigned int skb_headroom(const struct sk_buff *skb) { return skb->data - skb->head; }

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Linus Torvalds (pre-git)2295.65%375.00%
Chuck Lever14.35%125.00%
Total23100.00%4100.00%

/** * skb_tailroom - bytes at buffer end * @skb: buffer to check * * Return the number of bytes of free space at the tail of an sk_buff */
static inline int skb_tailroom(const struct sk_buff *skb) { return skb_is_nonlinear(skb) ? 0 : skb->end - skb->tail; }

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Linus Torvalds (pre-git)2068.97%360.00%
Linus Torvalds724.14%120.00%
Arnaldo Carvalho de Melo26.90%120.00%
Total29100.00%5100.00%

/** * skb_availroom - bytes at buffer end * @skb: buffer to check * * Return the number of bytes of free space at the tail of an sk_buff * allocated by sk_stream_alloc() */
static inline int skb_availroom(const struct sk_buff *skb) { if (skb_is_nonlinear(skb)) return 0; return skb->end - skb->tail - skb->reserved_tailroom; }

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Eric Dumazet36100.00%2100.00%
Total36100.00%2100.00%

/** * skb_reserve - adjust headroom * @skb: buffer to alter * @len: bytes to move * * Increase the headroom of an empty &sk_buff by reducing the tail * room. This is only allowed for an empty buffer. */
static inline void skb_reserve(struct sk_buff *skb, int len) { skb->data += len; skb->tail += len; }

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Linus Torvalds (pre-git)27100.00%2100.00%
Total27100.00%2100.00%

/** * skb_tailroom_reserve - adjust reserved_tailroom * @skb: buffer to alter * @mtu: maximum amount of headlen permitted * @needed_tailroom: minimum amount of reserved_tailroom * * Set reserved_tailroom so that headlen can be as large as possible but * not larger than mtu and tailroom cannot be smaller than * needed_tailroom. * The required headroom should already have been reserved before using * this function. */
static inline void skb_tailroom_reserve(struct sk_buff *skb, unsigned int mtu, unsigned int needed_tailroom) { SKB_LINEAR_ASSERT(skb); if (mtu < skb_tailroom(skb) - needed_tailroom) /* use at most mtu */ skb->reserved_tailroom = skb_tailroom(skb) - mtu; else /* use up to all available space */ skb->reserved_tailroom = needed_tailroom; }

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Benjamin Poirier56100.00%1100.00%
Total56100.00%1100.00%

#define ENCAP_TYPE_ETHER 0 #define ENCAP_TYPE_IPPROTO 1
static inline void skb_set_inner_protocol(struct sk_buff *skb, __be16 protocol) { skb->inner_protocol = protocol; skb->inner_protocol_type = ENCAP_TYPE_ETHER; }

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Tom Herbert2488.89%133.33%
Eric Dumazet311.11%266.67%
Total27100.00%3100.00%


static inline void skb_set_inner_ipproto(struct sk_buff *skb, __u8 ipproto) { skb->inner_ipproto = ipproto; skb->inner_protocol_type = ENCAP_TYPE_IPPROTO; }

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Linus Torvalds (pre-git)1866.67%266.67%
Tom Herbert933.33%133.33%
Total27100.00%3100.00%


static inline void skb_reset_inner_headers(struct sk_buff *skb) { skb->inner_mac_header = skb->mac_header; skb->inner_network_header = skb->network_header; skb->inner_transport_header = skb->transport_header; }

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Joseph Gasparakis2877.78%150.00%
Pravin B Shelar822.22%150.00%
Total36100.00%2100.00%


static inline void skb_reset_mac_len(struct sk_buff *skb) { skb->mac_len = skb->network_header - skb->mac_header; }

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Jiri Pirko24100.00%1100.00%
Total24100.00%1100.00%


static inline unsigned char *skb_inner_transport_header(const struct sk_buff *skb) { return skb->head + skb->inner_transport_header; }

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PersonTokensPropCommitsCommitProp
Joseph Gasparakis24100.00%1100.00%
Total24100.00%1100.00%


static inline int skb_inner_transport_offset(const struct sk_buff *skb) { return skb_inner_transport_header(skb) - skb->data; }

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PersonTokensPropCommitsCommitProp
Tom Herbert23100.00%1100.00%
Total23100.00%1100.00%


static inline void skb_reset_inner_transport_header(struct sk_buff *skb) { skb->inner_transport_header = skb->data - skb->head; }

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PersonTokensPropCommitsCommitProp
Joseph Gasparakis24100.00%1100.00%
Total24100.00%1100.00%


static inline void skb_set_inner_transport_header(struct sk_buff *skb, const int offset) { skb_reset_inner_transport_header(skb); skb->inner_transport_header += offset; }

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Joseph Gasparakis27100.00%1100.00%
Total27100.00%1100.00%


static inline unsigned char *skb_inner_network_header(const struct sk_buff *skb) { return skb->head + skb->inner_network_header; }

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Joseph Gasparakis24100.00%1100.00%
Total24100.00%1100.00%


static inline void skb_reset_inner_network_header(struct sk_buff *skb) { skb->inner_network_header = skb->data - skb->head; }

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PersonTokensPropCommitsCommitProp
Joseph Gasparakis24100.00%1100.00%
Total24100.00%1100.00%


static inline void skb_set_inner_network_header(struct sk_buff *skb, const int offset) { skb_reset_inner_network_header(skb); skb->inner_network_header += offset; }

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PersonTokensPropCommitsCommitProp
Joseph Gasparakis27100.00%1100.00%
Total27100.00%1100.00%


static inline unsigned char *skb_inner_mac_header(const struct sk_buff *skb) { return skb->head + skb->inner_mac_header; }

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Pravin B Shelar24100.00%1100.00%
Total24100.00%1100.00%


static inline void skb_reset_inner_mac_header(struct sk_buff *skb) { skb->inner_mac_header = skb->data - skb->head; }

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Pravin B Shelar24100.00%1100.00%
Total24100.00%1100.00%


static inline void skb_set_inner_mac_header(struct sk_buff *skb, const int offset) { skb_reset_inner_mac_header(skb); skb->inner_mac_header += offset; }

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Pravin B Shelar27100.00%1100.00%
Total27100.00%1100.00%


static inline bool skb_transport_header_was_set(const struct sk_buff *skb) { return skb->transport_header != (typeof(skb->transport_header))~0U; }

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Eric Dumazet2172.41%150.00%
Américo Wang827.59%150.00%
Total29100.00%2100.00%


static inline unsigned char *skb_transport_header(const struct sk_buff *skb) { return skb->head + skb->transport_header; }

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Arnaldo Carvalho de Melo24100.00%3100.00%
Total24100.00%3100.00%


static inline void skb_reset_transport_header(struct sk_buff *skb) { skb->transport_header = skb->data - skb->head; }

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Arnaldo Carvalho de Melo24100.00%3100.00%
Total24100.00%3100.00%


static inline void skb_set_transport_header(struct sk_buff *skb, const int offset) { skb_reset_transport_header(skb); skb->transport_header += offset; }

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Arnaldo Carvalho de Melo27100.00%3100.00%
Total27100.00%3100.00%


static inline unsigned char *skb_network_header(const struct sk_buff *skb) { return skb->head + skb->network_header; }

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Arnaldo Carvalho de Melo24100.00%1100.00%
Total24100.00%1100.00%


static inline void skb_reset_network_header(struct sk_buff *skb) { skb->network_header = skb->data - skb->head; }

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Arnaldo Carvalho de Melo24100.00%2100.00%
Total24100.00%2100.00%


static inline void skb_set_network_header(struct sk_buff *skb, const int offset) { skb_reset_network_header(skb); skb->network_header += offset; }

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PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo27100.00%2100.00%
Total27100.00%2100.00%


static inline unsigned char *skb_mac_header(const struct sk_buff *skb) { return skb->head + skb->mac_header; }

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Arnaldo Carvalho de Melo24100.00%1100.00%
Total24100.00%1100.00%


static inline int skb_mac_offset(const struct sk_buff *skb) { return skb_mac_header(skb) - skb->data; }

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Amir Vadai23100.00%1100.00%
Total23100.00%1100.00%


static inline u32 skb_mac_header_len(const struct sk_buff *skb) { return skb->network_header - skb->mac_header; }

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Daniel Borkmann22100.00%1100.00%
Total22100.00%1100.00%


static inline int skb_mac_header_was_set(const struct sk_buff *skb) { return skb->mac_header != (typeof(skb->mac_header))~0U; }

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Arnaldo Carvalho de Melo2172.41%266.67%
Américo Wang827.59%133.33%
Total29100.00%3100.00%


static inline void skb_reset_mac_header(struct sk_buff *skb) { skb->mac_header = skb->data - skb->head; }

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Arnaldo Carvalho de Melo24100.00%2100.00%
Total24100.00%2100.00%


static inline void skb_set_mac_header(struct sk_buff *skb, const int offset) { skb_reset_mac_header(skb); skb->mac_header += offset; }

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Arnaldo Carvalho de Melo27100.00%1100.00%
Total27100.00%1100.00%


static inline void skb_pop_mac_header(struct sk_buff *skb) { skb->mac_header = skb->network_header; }

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Timo Teräs20100.00%1100.00%
Total20100.00%1100.00%


static inline void skb_probe_transport_header(struct sk_buff *skb, const int offset_hint) { struct flow_keys keys; if (skb_transport_header_was_set(skb)) return; else if (skb_flow_dissect_flow_keys(skb, &keys, 0)) skb_set_transport_header(skb, keys.control.thoff); else skb_set_transport_header(skb, offset_hint); }

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Ying Xue5591.67%125.00%
Tom Herbert35.00%250.00%
Jiri Pirko23.33%125.00%
Total60100.00%4100.00%


static inline void skb_mac_header_rebuild(struct sk_buff *skb) { if (skb_mac_header_was_set(skb)) { const unsigned char *old_mac = skb_mac_header(skb); skb_set_mac_header(skb, -skb->mac_len); memmove(skb_mac_header(skb), old_mac, skb->mac_len); } }

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Eric Dumazet56100.00%1100.00%
Total56100.00%1100.00%


static inline int skb_checksum_start_offset(const struct sk_buff *skb) { return skb->csum_start - skb_headroom(skb); }

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Michał Mirosław23100.00%1100.00%
Total23100.00%1100.00%


static inline unsigned char *skb_checksum_start(const struct sk_buff *skb) { return skb->head + skb->csum_start; }

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Alexander Duyck24100.00%1100.00%
Total24100.00%1100.00%


static inline int skb_transport_offset(const struct sk_buff *skb) { return skb_transport_header(skb) - skb->data; }

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Arnaldo Carvalho de Melo23100.00%1100.00%
Total23100.00%1100.00%


static inline u32 skb_network_header_len(const struct sk_buff *skb) { return skb->transport_header - skb->network_header; }

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Arnaldo Carvalho de Melo22100.00%1100.00%
Total22100.00%1100.00%


static inline u32 skb_inner_network_header_len(const struct sk_buff *skb) { return skb->inner_transport_header - skb->inner_network_header; }

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PersonTokensPropCommitsCommitProp
Joseph Gasparakis22100.00%1100.00%
Total22100.00%1100.00%


static inline int skb_network_offset(const struct sk_buff *skb) { return skb_network_header(skb) - skb->data; }

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Arnaldo Carvalho de Melo23100.00%1100.00%
Total23100.00%1100.00%


static inline int skb_inner_network_offset(const struct sk_buff *skb) { return skb_inner_network_header(skb) - skb->data; }

Contributors

PersonTokensPropCommitsCommitProp
Joseph Gasparakis23100.00%1100.00%
Total23100.00%1100.00%


static inline int pskb_network_may_pull(struct sk_buff *skb, unsigned int len) { return pskb_may_pull(skb, skb_network_offset(skb) + len); }

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Changli Gao29100.00%1100.00%
Total29100.00%1100.00%

/* * CPUs often take a performance hit when accessing unaligned memory * locations. The actual performance hit varies, it can be small if the * hardware handles it or large if we have to take an exception and fix it * in software. * * Since an ethernet header is 14 bytes network drivers often end up with * the IP header at an unaligned offset. The IP header can be aligned by * shifting the start of the packet by 2 bytes. Drivers should do this * with: * * skb_reserve(skb, NET_IP_ALIGN); * * The downside to this alignment of the IP header is that the DMA is now * unaligned. On some architectures the cost of an unaligned DMA is high * and this cost outweighs the gains made by aligning the IP header. * * Since this trade off varies between architectures, we allow NET_IP_ALIGN * to be overridden. */ #ifndef NET_IP_ALIGN #define NET_IP_ALIGN 2 #endif /* * The networking layer reserves some headroom in skb data (via * dev_alloc_skb). This is used to avoid having to reallocate skb data when * the header has to grow. In the default case, if the header has to grow * 32 bytes or less we avoid the reallocation. * * Unfortunately this headroom changes the DMA alignment of the resulting * network packet. As for NET_IP_ALIGN, this unaligned DMA is expensive * on some architectures. An architecture can override this value, * perhaps setting it to a cacheline in size (since that will maintain * cacheline alignment of the DMA). It must be a power of 2. * * Various parts of the networking layer expect at least 32 bytes of * headroom, you should not reduce this. * * Using max(32, L1_CACHE_BYTES) makes sense (especially with RPS) * to reduce average number of cache lines per packet. * get_rps_cpus() for example only access one 64 bytes aligned block : * NET_IP_ALIGN(2) + ethernet_header(14) + IP_header(20/40) + ports(8) */ #ifndef NET_SKB_PAD #define NET_SKB_PAD max(32, L1_CACHE_BYTES) #endif int ___pskb_trim(struct sk_buff *skb, unsigned int len);
static inline void __skb_set_length(struct sk_buff *skb, unsigned int len) { if (unlikely(skb_is_nonlinear(skb))) { WARN_ON(1); return; } skb->len = len; skb_set_tail_pointer(skb, len); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)2451.06%337.50%
Herbert Xu1021.28%112.50%
Linus Torvalds510.64%112.50%
Arnaldo Carvalho de Melo48.51%112.50%
Emmanuel Grumbach36.38%112.50%
Daniel Borkmann12.13%112.50%
Total47100.00%8100.00%


static inline void __skb_trim(struct sk_buff *skb, unsigned int len) { __skb_set_length(skb, len); }

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PersonTokensPropCommitsCommitProp
Daniel Borkmann23100.00%1100.00%
Total23100.00%1100.00%

void skb_trim(struct sk_buff *skb, unsigned int len);
static inline int __pskb_trim(struct sk_buff *skb, unsigned int len) { if (skb->data_len) return ___pskb_trim(skb, len); __skb_trim(skb, len); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds1742.50%125.00%
Linus Torvalds (pre-git)1435.00%250.00%
Herbert Xu922.50%125.00%
Total40100.00%4100.00%


static inline int pskb_trim(struct sk_buff *skb, unsigned int len) { return (len < skb->len) ? __pskb_trim(skb, len) : 0; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds2985.29%150.00%
Arnaldo Carvalho de Melo514.71%150.00%
Total34100.00%2100.00%

/** * pskb_trim_unique - remove end from a paged unique (not cloned) buffer * @skb: buffer to alter * @len: new length * * This is identical to pskb_trim except that the caller knows that * the skb is not cloned so we should never get an error due to out- * of-memory. */
static inline void pskb_trim_unique(struct sk_buff *skb, unsigned int len) { int err = pskb_trim(skb, len); BUG_ON(err); }

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PersonTokensPropCommitsCommitProp
Herbert Xu31100.00%1100.00%
Total31100.00%1100.00%


static inline int __skb_grow(struct sk_buff *skb, unsigned int len) { unsigned int diff = len - skb->len; if (skb_tailroom(skb) < diff) { int ret = pskb_expand_head(skb, 0, diff - skb_tailroom(skb), GFP_ATOMIC); if (ret) return ret; } __skb_set_length(skb, len); return 0; }

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PersonTokensPropCommitsCommitProp
Daniel Borkmann73100.00%1100.00%
Total73100.00%1100.00%

/** * skb_orphan - orphan a buffer * @skb: buffer to orphan * * If a buffer currently has an owner then we call the owner's * destructor function and make the @skb unowned. The buffer continues * to exist but is no longer charged to its former owner. */
static inline void skb_orphan(struct sk_buff *skb) { if (skb->destructor) { skb->destructor(skb); skb->destructor = NULL; skb->sk = NULL; } else { BUG_ON(skb->sk); } }

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Linus Torvalds3775.51%133.33%
Eric Dumazet1224.49%266.67%
Total49100.00%3100.00%

/** * skb_orphan_frags - orphan the frags contained in a buffer * @skb: buffer to orphan frags from * @gfp_mask: allocation mask for replacement pages * * For each frag in the SKB which needs a destructor (i.e. has an * owner) create a copy of that frag and release the original * page by calling the destructor. */
static inline int skb_orphan_frags(struct sk_buff *skb, gfp_t gfp_mask) { if (likely(!skb_zcopy(skb))) return 0; if (skb_uarg(skb)->callback == sock_zerocopy_callback) return 0; return skb_copy_ubufs(skb, gfp_mask); }

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PersonTokensPropCommitsCommitProp
Willem de Bruijn2854.90%150.00%
Michael S. Tsirkin2345.10%150.00%
Total51100.00%2100.00%

/* Frags must be orphaned, even if refcounted, if skb might loop to rx path */
static inline int skb_orphan_frags_rx(struct sk_buff *skb, gfp_t gfp_mask) { if (likely(!skb_zcopy(skb))) return 0; return skb_copy_ubufs(skb, gfp_mask); }

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PersonTokensPropCommitsCommitProp
Willem de Bruijn2362.16%150.00%
Michael S. Tsirkin1437.84%150.00%
Total37100.00%2100.00%

/** * __skb_queue_purge - empty a list * @list: list to empty * * Delete all buffers on an &sk_buff list. Each buffer is removed from * the list and one reference dropped. This function does not take the * list lock and the caller must hold the relevant locks to use it. */ void skb_queue_purge(struct sk_buff_head *list);
static inline void __skb_queue_purge(struct sk_buff_head *list) { struct sk_buff *skb; while ((skb = __skb_dequeue(list)) != NULL) kfree_skb(skb); }

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PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)35100.00%2100.00%
Total35100.00%2100.00%

void skb_rbtree_purge(struct rb_root *root); void *netdev_alloc_frag(unsigned int fragsz); struct sk_buff *__netdev_alloc_skb(struct net_device *dev, unsigned int length, gfp_t gfp_mask); /** * netdev_alloc_skb - allocate an skbuff for rx on a specific device * @dev: network device to receive on * @length: length to allocate * * Allocate a new &sk_buff and assign it a usage count of one. The * buffer has unspecified headroom built in. Users should allocate * the headroom they think they need without accounting for the * built in space. The built in space is used for optimisations. * * %NULL is returned if there is no free memory. Although this function * allocates memory it can be called from an interrupt. */
static inline struct sk_buff *netdev_alloc_skb(struct net_device *dev, unsigned int length) { return __netdev_alloc_skb(dev, length, GFP_ATOMIC); }

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PersonTokensPropCommitsCommitProp
Christoph Hellwig28100.00%1100.00%
Total28100.00%1100.00%

/* legacy helper around __netdev_alloc_skb() */
static inline struct sk_buff *__dev_alloc_skb(unsigned int length, gfp_t gfp_mask) { return __netdev_alloc_skb(NULL, length, gfp_mask); }

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PersonTokensPropCommitsCommitProp
Eric Dumazet26100.00%1100.00%
Total26100.00%1100.00%

/* legacy helper around netdev_alloc_skb() */
static inline struct sk_buff *dev_alloc_skb(unsigned int length) { return netdev_alloc_skb(NULL, length); }

Contributors

PersonTokensPropCommitsCommitProp
Eric Dumazet21100.00%1100.00%
Total21100.00%1100.00%


static inline struct sk_buff *__netdev_alloc_skb_ip_align(struct net_device *dev, unsigned int length, gfp_t gfp) { struct sk_buff *skb = __netdev_alloc_skb(dev, length + NET_IP_ALIGN, gfp); if (NET_IP_ALIGN && skb) skb_reserve(skb, NET_IP_ALIGN); return skb; }

Contributors

PersonTokensPropCommitsCommitProp
Eric Dumazet53100.00%2100.00%
Total53100.00%2100.00%


static inline struct sk_buff *netdev_alloc_skb_ip_align(struct net_device *dev, unsigned int length) { return __netdev_alloc_skb_ip_align(dev, length, GFP_ATOMIC); }

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PersonTokensPropCommitsCommitProp
Eric Dumazet28100.00%1100.00%
Total28100.00%1100.00%


static inline void skb_free_frag(void *addr) { page_frag_free(addr); }

Contributors

PersonTokensPropCommitsCommitProp
Alexander Duyck16100.00%2100.00%
Total16100.00%2100.00%

void *napi_alloc_frag(unsigned int fragsz); struct sk_buff *__napi_alloc_skb(struct napi_struct *napi, unsigned int length, gfp_t gfp_mask);
static inline struct sk_buff *napi_alloc_skb(struct napi_struct *napi, unsigned int length) { return __napi_alloc_skb(napi, length, GFP_ATOMIC); }

Contributors

PersonTokensPropCommitsCommitProp
Alexander Duyck28100.00%1100.00%
Total28100.00%1100.00%

void napi_consume_skb(struct sk_buff *skb, int budget); void __kfree_skb_flush(void); void __kfree_skb_defer(struct sk_buff *skb); /** * __dev_alloc_pages - allocate page for network Rx * @gfp_mask: allocation priority. Set __GFP_NOMEMALLOC if not for network Rx * @order: size of the allocation * * Allocate a new page. * * %NULL is returned if there is no free memory. */
static inline struct page *__dev_alloc_pages(gfp_t gfp_mask, unsigned int order) { /* This piece of code contains several assumptions. * 1. This is for device Rx, therefor a cold page is preferred. * 2. The expectation is the user wants a compound page. * 3. If requesting a order 0 page it will not be compound * due to the check to see if order has a value in prep_new_page * 4. __GFP_MEMALLOC is ignored if __GFP_NOMEMALLOC is set due to * code in gfp_to_alloc_flags that should be enforcing this. */ gfp_mask |= __GFP_COMP | __GFP_MEMALLOC; return alloc_pages_node(NUMA_NO_NODE, gfp_mask, order); }

Contributors

PersonTokensPropCommitsCommitProp
Alexander Duyck33100.00%1100.00%
Total33100.00%1100.00%


static inline struct page *dev_alloc_pages(unsigned int order) { return __dev_alloc_pages(GFP_ATOMIC | __GFP_NOWARN, order); }

Contributors

PersonTokensPropCommitsCommitProp
Alexander Duyck2191.30%150.00%
Neil Horman28.70%150.00%
Total23100.00%2100.00%

/** * __dev_alloc_page - allocate a page for network Rx * @gfp_mask: allocation priority. Set __GFP_NOMEMALLOC if not for network Rx * * Allocate a new page. * * %NULL is returned if there is no free memory. */
static inline struct page *__dev_alloc_page(gfp_t gfp_mask) { return __dev_alloc_pages(gfp_mask, 0); }

Contributors

PersonTokensPropCommitsCommitProp
Alexander Duyck20100.00%1100.00%
Total20100.00%1100.00%


static inline struct page *dev_alloc_page(void) { return dev_alloc_pages(0); }

Contributors

PersonTokensPropCommitsCommitProp
Alexander Duyck1588.24%150.00%
Neil Horman211.76%150.00%
Total17100.00%2100.00%

/** * skb_propagate_pfmemalloc - Propagate pfmemalloc if skb is allocated after RX page * @page: The page that was allocated from skb_alloc_page * @skb: The skb that may need pfmemalloc set */
static inline void skb_propagate_pfmemalloc(struct page *page, struct sk_buff *skb) { if (page_is_pfmemalloc(page)) skb->pfmemalloc = true; }

Contributors

PersonTokensPropCommitsCommitProp
Mel Gorman2790.00%150.00%
Michal Hocko310.00%150.00%
Total30100.00%2100.00%

/** * skb_frag_page - retrieve the page referred to by a paged fragment * @frag: the paged fragment * * Returns the &struct page associated with @frag. */
static inline struct page *skb_frag_page(const skb_frag_t *frag) { return frag->page.p; }

Contributors

PersonTokensPropCommitsCommitProp
Ian Campbell21100.00%2100.00%
Total21100.00%2100.00%

/** * __skb_frag_ref - take an addition reference on a paged fragment. * @frag: the paged fragment * * Takes an additional reference on the paged fragment @frag. */
static inline void __skb_frag_ref(skb_frag_t *frag) { get_page(skb_frag_page(frag)); }

Contributors

PersonTokensPropCommitsCommitProp
Ian Campbell19100.00%1100.00%
Total19100.00%1100.00%

/** * skb_frag_ref - take an addition reference on a paged fragment of an skb. * @skb: the buffer * @f: the fragment offset. * * Takes an additional reference on the @f'th paged fragment of @skb. */
static inline void skb_frag_ref(struct sk_buff *skb, int f) { __skb_frag_ref(&skb_shinfo(skb)->frags[f]); }

Contributors

PersonTokensPropCommitsCommitProp
Ian Campbell29100.00%1100.00%
Total29100.00%1100.00%

/** * __skb_frag_unref - release a reference on a paged fragment. * @frag: the paged fragment * * Releases a reference on the paged fragment @frag. */
static inline void __skb_frag_unref(skb_frag_t *frag) { put_page(skb_frag_page(frag)); }

Contributors

PersonTokensPropCommitsCommitProp
Ian Campbell19100.00%1100.00%
Total19100.00%1100.00%

/** * skb_frag_unref - release a reference on a paged fragment of an skb. * @skb: the buffer * @f: the fragment offset * * Releases a reference on the @f'th paged fragment of @skb. */
static inline void skb_frag_unref(struct sk_buff *skb, int f) { __skb_frag_unref(&skb_shinfo(skb)->frags[f]); }

Contributors

PersonTokensPropCommitsCommitProp
Ian Campbell29100.00%1100.00%
Total29100.00%1100.00%

/** * skb_frag_address - gets the address of the data contained in a paged fragment * @frag: the paged fragment buffer * * Returns the address of the data within @frag. The page must already * be mapped. */
static inline void *skb_frag_address(const skb_frag_t *frag) { return page_address(skb_frag_page(frag)) + frag->page_offset; }

Contributors

PersonTokensPropCommitsCommitProp
Ian Campbell26100.00%1100.00%
Total26100.00%1100.00%

/** * skb_frag_address_safe - gets the address of the data contained in a paged fragment * @frag: the paged fragment buffer * * Returns the address of the data within @frag. Checks that the page * is mapped and returns %NULL otherwise. */
static inline void *skb_frag_address_safe(const skb_frag_t *frag) { void *ptr = page_address(skb_frag_page(frag)); if (unlikely(!ptr)) return NULL; return ptr + frag->page_offset; }

Contributors

PersonTokensPropCommitsCommitProp
Ian Campbell43100.00%1100.00%
Total43100.00%1100.00%

/** * __skb_frag_set_page - sets the page contained in a paged fragment * @frag: the paged fragment * @page: the page to set * * Sets the fragment @frag to contain @page. */
static inline void __skb_frag_set_page(skb_frag_t *frag, struct page *page) { frag->page.p = page; }

Contributors

PersonTokensPropCommitsCommitProp
Ian Campbell24100.00%2100.00%
Total24100.00%2100.00%

/** * skb_frag_set_page - sets the page contained in a paged fragment of an skb * @skb: the buffer * @f: the fragment offset * @page: the page to set * * Sets the @f'th fragment of @skb to contain @page. */
static inline void skb_frag_set_page(struct sk_buff *skb, int f, struct page *page) { __skb_frag_set_page(&skb_shinfo(skb)->frags[f], page); }

Contributors

PersonTokensPropCommitsCommitProp
Ian Campbell36100.00%1100.00%
Total36100.00%1100.00%

bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t prio); /** * skb_frag_dma_map - maps a paged fragment via the DMA API * @dev: the device to map the fragment to * @frag: the paged fragment to map * @offset: the offset within the fragment (starting at the * fragment's own offset) * @size: the number of bytes to map * @dir: the direction of the mapping (``PCI_DMA_*``) * * Maps the page associated with @frag to @device. */
static inline dma_addr_t skb_frag_dma_map(struct device *dev, const skb_frag_t *frag, size_t offset, size_t size, enum dma_data_direction dir) { return dma_map_page(dev, skb_frag_page(frag), frag->page_offset + offset, size, dir); }

Contributors

PersonTokensPropCommitsCommitProp
Ian Campbell48100.00%1100.00%
Total48100.00%1100.00%


static inline struct sk_buff *pskb_copy(struct sk_buff *skb, gfp_t gfp_mask) { return __pskb_copy(skb, skb_headroom(skb), gfp_mask); }

Contributors

PersonTokensPropCommitsCommitProp
Eric Dumazet30100.00%1100.00%
Total30100.00%1100.00%


static inline struct sk_buff *pskb_copy_for_clone(struct sk_buff *skb, gfp_t gfp_mask) { return __pskb_copy_fclone(skb, skb_headroom(skb), gfp_mask, true); }

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PersonTokensPropCommitsCommitProp
Octavian Purdila32100.00%1100.00%
Total32100.00%1100.00%

/** * skb_clone_writable - is the header of a clone writable * @skb: buffer to check * @len: length up to which to write * * Returns true if modifying the header part of the cloned buffer * does not requires the data to be copied. */
static inline int skb_clone_writable(const struct sk_buff *skb, unsigned int len) { return !skb_header_cloned(skb) && skb_headroom(skb) + len <= skb->hdr_len; }

Contributors

PersonTokensPropCommitsCommitProp
Patrick McHardy3394.29%133.33%
Chuck Lever12.86%133.33%
Eric Dumazet12.86%133.33%
Total35100.00%3100.00%


static inline int skb_try_make_writable(struct sk_buff *skb, unsigned int write_len) { return skb_cloned(skb) && !skb_clone_writable(skb, write_len) && pskb_expand_head(skb, 0, 0, GFP_ATOMIC); }

Contributors

PersonTokensPropCommitsCommitProp
Daniel Borkmann41100.00%1100.00%
Total41100.00%1100.00%


static inline int __skb_cow(struct sk_buff *skb, unsigned int headroom, int cloned) { int delta = 0; if (headroom > skb_headroom(skb)) delta = headroom - skb_headroom(skb); if (delta || cloned) return pskb_expand_head(skb, ALIGN(delta, NET_SKB_PAD), 0, GFP_ATOMIC); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds2841.18%233.33%
Herbert Xu2029.41%116.67%
Linus Torvalds (pre-git)1927.94%233.33%
Anton Blanchard11.47%116.67%
Total68100.00%6100.00%

/** * skb_cow - copy header of skb when it is required * @skb: buffer to cow * @headroom: needed headroom * * If the skb passed lacks sufficient headroom or its data part * is shared, data is reallocated. If reallocation fails, an error * is returned and original skb is not changed. * * The result is skb with writable area skb->head...skb->tail * and at least @headroom of space at head. */
static inline int skb_cow(struct sk_buff *skb, unsigned int headroom) { return __skb_cow(skb, headroom, skb_cloned(skb)); }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu29100.00%1100.00%
Total29100.00%1100.00%

/** * skb_cow_head - skb_cow but only making the head writable * @skb: buffer to cow * @headroom: needed headroom * * This function is identical to skb_cow except that we replace the * skb_cloned check by skb_header_cloned. It should be used when * you only need to push on some header and do not need to modify * the data. */
static inline int skb_cow_head(struct sk_buff *skb, unsigned int headroom) { return __skb_cow(skb, headroom, skb_header_cloned(skb)); }

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PersonTokensPropCommitsCommitProp
Herbert Xu29100.00%1100.00%
Total29100.00%1100.00%

/** * skb_padto - pad an skbuff up to a minimal size * @skb: buffer to pad * @len: minimal length * * Pads up a buffer to ensure the trailing bytes exist and are * blanked. If the buffer already contains sufficient data it * is untouched. Otherwise it is extended. Returns zero on * success. The skb is freed on error. */
static inline int skb_padto(struct sk_buff *skb, unsigned int len) { unsigned int size = skb->len; if (likely(size >= len)) return 0; return skb_pad(skb, len - size); }

Contributors

PersonTokensPropCommitsCommitProp
Alan Cox4495.65%150.00%
Herbert Xu24.35%150.00%
Total46100.00%2100.00%

/** * skb_put_padto - increase size and pad an skbuff up to a minimal size * @skb: buffer to pad * @len: minimal length * @free_on_error: free buffer on error * * Pads up a buffer to ensure the trailing bytes exist and are * blanked. If the buffer already contains sufficient data it * is untouched. Otherwise it is extended. Returns zero on * success. The skb is freed on error if @free_on_error is true. */
static inline int __skb_put_padto(struct sk_buff *skb, unsigned int len, bool free_on_error) { unsigned int size = skb->len; if (unlikely(size < len)) { len -= size; if (__skb_pad(skb, len, free_on_error)) return -ENOMEM; __skb_put(skb, len); } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Alexander Duyck6089.55%150.00%
Florian Fainelli710.45%150.00%
Total67100.00%2100.00%

/** * skb_put_padto - increase size and pad an skbuff up to a minimal size * @skb: buffer to pad * @len: minimal length * * Pads up a buffer to ensure the trailing bytes exist and are * blanked. If the buffer already contains sufficient data it * is untouched. Otherwise it is extended. Returns zero on * success. The skb is freed on error. */
static inline int skb_put_padto(struct sk_buff *skb, unsigned int len) { return __skb_put_padto(skb, len, true); }

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PersonTokensPropCommitsCommitProp
Florian Fainelli26100.00%1100.00%
Total26100.00%1100.00%


static inline int skb_add_data(struct sk_buff *skb, struct iov_iter *from, int copy) { const int off = skb->len; if (skb->ip_summed == CHECKSUM_NONE) { __wsum csum = 0; if (csum_and_copy_from_iter_full(skb_put(skb, copy), copy, &csum, from)) { skb->csum = csum_block_add(skb->csum, csum, off); return 0; } } else if (copy_from_iter_full(skb_put(skb, copy), copy, from)) return 0; __skb_trim(skb, off); return -EFAULT; }

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PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo9987.61%125.00%
Al Viro1412.39%375.00%
Total113100.00%4100.00%


static inline bool skb_can_coalesce(struct sk_buff *skb, int i, const struct page *page, int off) { if (skb_zcopy(skb)) return false; if (i) { const struct skb_frag_struct *frag = &skb_shinfo(skb)->frags[i - 1]; return page == skb_frag_page(frag) && off == frag->page_offset + skb_frag_size(frag); } return false; }

Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo6175.31%120.00%
Willem de Bruijn1012.35%120.00%
Eric Dumazet67.41%240.00%
Ian Campbell44.94%120.00%
Total81100.00%5100.00%


static inline int __skb_linearize(struct sk_buff *skb) { return __pskb_pull_tail(skb, skb->data_len) ? 0 : -ENOMEM; }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu1970.37%125.00%
Linus Torvalds (pre-git)414.81%125.00%
Linus Torvalds311.11%125.00%
David S. Miller13.70%125.00%
Total27100.00%4100.00%

/** * skb_linearize - convert paged skb to linear one * @skb: buffer to linarize * * If there is no free memory -ENOMEM is returned, otherwise zero * is returned and the old skb data released. */
static inline int skb_linearize(struct sk_buff *skb) { return skb_is_nonlinear(skb) ? __skb_linearize(skb) : 0; }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller1664.00%150.00%
Herbert Xu936.00%150.00%
Total25100.00%2100.00%

/** * skb_has_shared_frag - can any frag be overwritten * @skb: buffer to test * * Return true if the skb has at least one frag that might be modified * by an external entity (as in vmsplice()/sendfile()) */
static inline bool skb_has_shared_frag(const struct sk_buff *skb) { return skb_is_nonlinear(skb) && skb_shinfo(skb)->tx_flags & SKBTX_SHARED_FRAG; }

Contributors

PersonTokensPropCommitsCommitProp
Eric Dumazet2175.00%150.00%
Pravin B Shelar725.00%150.00%
Total28100.00%2100.00%

/** * skb_linearize_cow - make sure skb is linear and writable * @skb: buffer to process * * If there is no free memory -ENOMEM is returned, otherwise zero * is returned and the old skb data released. */
static inline int skb_linearize_cow(struct sk_buff *skb) { return skb_is_nonlinear(skb) || skb_cloned(skb) ? __skb_linearize(skb) : 0; }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu2893.33%150.00%
David S. Miller26.67%150.00%
Total30100.00%2100.00%


static __always_inline void __skb_postpull_rcsum(struct sk_buff *skb, const void *start, unsigned int len, unsigned int off) { if (skb->ip_summed == CHECKSUM_COMPLETE) skb->csum = csum_block_sub(skb->csum, csum_partial(start, len, 0), off); else if (skb->ip_summed == CHECKSUM_PARTIAL && skb_checksum_start_offset(skb) < 0) skb->ip_summed = CHECKSUM_NONE; }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu4558.44%233.33%
Pravin B Shelar2228.57%233.33%
Daniel Borkmann911.69%116.67%
Patrick McHardy11.30%116.67%
Total77100.00%6100.00%

/** * skb_postpull_rcsum - update checksum for received skb after pull * @skb: buffer to update * @start: start of data before pull * @len: length of data pulled * * After doing a pull on a received packet, you need to call this to * update the CHECKSUM_COMPLETE checksum, or set ip_summed to * CHECKSUM_NONE so that it can be recomputed from scratch. */
static inline void skb_postpull_rcsum(struct sk_buff *skb, const void *start, unsigned int len) { __skb_postpull_rcsum(skb, start, len, 0); }

Contributors

PersonTokensPropCommitsCommitProp
Daniel Borkmann2268.75%150.00%
Herbert Xu1031.25%150.00%
Total32100.00%2100.00%


static __always_inline void __skb_postpush_rcsum(struct sk_buff *skb, const void *start, unsigned int len, unsigned int off) { if (skb->ip_summed == CHECKSUM_COMPLETE) skb->csum = csum_block_add(skb->csum, csum_partial(start, len, 0), off); }

Contributors

PersonTokensPropCommitsCommitProp
Daniel Borkmann55100.00%2100.00%
Total55100.00%2100.00%

/** * skb_postpush_rcsum - update checksum for received skb after push * @skb: buffer to update * @start: start of data after push * @len: length of data pushed * * After doing a push on a received packet, you need to call this to * update the CHECKSUM_COMPLETE checksum. */
static inline void skb_postpush_rcsum(struct sk_buff *skb, const void *start, unsigned int len) { __skb_postpush_rcsum(skb, start, len, 0); }

Contributors

PersonTokensPropCommitsCommitProp
Daniel Borkmann32100.00%2100.00%
Total32100.00%2100.00%

void *skb_pull_rcsum(struct sk_buff *skb, unsigned int len); /** * skb_push_rcsum - push skb and update receive checksum * @skb: buffer to update * @len: length of data pulled * * This function performs an skb_push on the packet and updates * the CHECKSUM_COMPLETE checksum. It should be used on * receive path processing instead of skb_push unless you know * that the checksum difference is zero (e.g., a valid IP header) * or you are setting ip_summed to CHECKSUM_NONE. */
static inline void *skb_push_rcsum(struct sk_buff *skb, unsigned int len) { skb_push(skb, len); skb_postpush_rcsum(skb, skb->data, len); return skb->data; }

Contributors

PersonTokensPropCommitsCommitProp
Américo Wang3895.00%133.33%
Johannes Berg12.50%133.33%
Daniel Borkmann12.50%133.33%
Total40100.00%3100.00%

/** * pskb_trim_rcsum - trim received skb and update checksum * @skb: buffer to trim * @len: new length * * This is exactly the same as pskb_trim except that it ensures the * checksum of received packets are still valid after the operation. */
static inline int pskb_trim_rcsum(struct sk_buff *skb, unsigned int len) { if (likely(len >= skb->len)) return 0; if (skb->ip_summed == CHECKSUM_COMPLETE) skb->ip_summed = CHECKSUM_NONE; return __pskb_trim(skb, len); }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller52100.00%1100.00%
Total52100.00%1100.00%


static inline int __skb_trim_rcsum(struct sk_buff *skb, unsigned int len) { if (skb->ip_summed == CHECKSUM_COMPLETE) skb->ip_summed = CHECKSUM_NONE; __skb_trim(skb, len); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Daniel Borkmann40100.00%1100.00%
Total40100.00%1100.00%


static inline int __skb_grow_rcsum(struct sk_buff *skb, unsigned int len) { if (skb->ip_summed == CHECKSUM_COMPLETE) skb->ip_summed = CHECKSUM_NONE; return __skb_grow(skb, len); }

Contributors

PersonTokensPropCommitsCommitProp
Daniel Borkmann38100.00%1100.00%
Total38100.00%1100.00%

#define rb_to_skb(rb) rb_entry_safe(rb, struct sk_buff, rbnode) #define skb_rb_first(root) rb_to_skb(rb_first(root)) #define skb_rb_last(root) rb_to_skb(rb_last(root)) #define skb_rb_next(skb) rb_to_skb(rb_next(&(skb)->rbnode)) #define skb_rb_prev(skb) rb_to_skb(rb_prev(&(skb)->rbnode)) #define skb_queue_walk(queue, skb) \ for (skb = (queue)->next; \ skb != (struct sk_buff *)(queue); \ skb = skb->next) #define skb_queue_walk_safe(queue, skb, tmp) \ for (skb = (queue)->next, tmp = skb->next; \ skb != (struct sk_buff *)(queue); \ skb = tmp, tmp = skb->next) #define skb_queue_walk_from(queue, skb) \ for (; skb != (struct sk_buff *)(queue); \ skb = skb->next) #define skb_rbtree_walk(skb, root) \ for (skb = skb_rb_first(root); skb != NULL; \ skb = skb_rb_next(skb)) #define skb_rbtree_walk_from(skb) \ for (; skb != NULL; \ skb = skb_rb_next(skb)) #define skb_rbtree_walk_from_safe(skb, tmp) \ for (; tmp = skb ? skb_rb_next(skb) : NULL, (skb != NULL); \ skb = tmp) #define skb_queue_walk_from_safe(queue, skb, tmp) \ for (tmp = skb->next; \ skb != (struct sk_buff *)(queue); \ skb = tmp, tmp = skb->next) #define skb_queue_reverse_walk(queue, skb) \ for (skb = (queue)->prev; \ skb != (struct sk_buff *)(queue); \ skb = skb->prev) #define skb_queue_reverse_walk_safe(queue, skb, tmp) \ for (skb = (queue)->prev, tmp = skb->prev; \ skb != (struct sk_buff *)(queue); \ skb = tmp, tmp = skb->prev) #define skb_queue_reverse_walk_from_safe(queue, skb, tmp) \ for (tmp = skb->prev; \ skb != (struct sk_buff *)(queue); \ skb = tmp, tmp = skb->prev)
static inline bool skb_has_frag_list(const struct sk_buff *skb) { return skb_shinfo(skb)->frag_list != NULL; }

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David S. Miller23100.00%2100.00%
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static inline void skb_frag_list_init(struct sk_buff *skb) { skb_shinfo(skb)->frag_list = NULL; }

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David S. Miller21100.00%1100.00%
Total21100.00%1100.00%

#define skb_walk_frags(skb, iter) \ for (iter = skb_shinfo(skb)->frag_list; iter; iter = iter->next) int __skb_wait_for_more_packets(struct sock *sk, int *err, long *timeo_p, const struct sk_buff *skb); struct sk_buff *__skb_try_recv_from_queue(struct sock *sk, struct sk_buff_head *queue, unsigned int flags, void (*destructor)(struct sock *sk, struct sk_buff *skb), int *peeked, int *off, int *err, struct sk_buff **last); struct sk_buff *__skb_try_recv_datagram(struct sock *sk, unsigned flags, void (*destructor)(struct sock *sk, struct sk_buff *skb), int *peeked, int *off, int *err, struct sk_buff **last); struct sk_buff *__skb_recv_datagram(struct sock *sk, unsigned flags, void (*destructor)(struct sock *sk, struct sk_buff *skb), int *peeked, int *off, int *err); struct sk_buff *skb_recv_datagram(struct sock *sk, unsigned flags, int noblock, int *err); unsigned int datagram_poll(struct file *file, struct socket *sock, struct poll_table_struct *wait); int skb_copy_datagram_iter(const struct sk_buff *from, int offset, struct iov_iter *to, int size);
static inline int skb_copy_datagram_msg(const struct sk_buff *from, int offset, struct msghdr *msg, int size) { return skb_copy_datagram_iter(from, offset, &msg->msg_iter, size); }

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David S. Miller3692.31%133.33%
Al Viro37.69%266.67%
Total39100.00%3100.00%

int skb_copy_and_csum_datagram_msg(struct sk_buff *skb, int hlen, struct msghdr *msg); int skb_copy_datagram_from_iter(struct sk_buff *skb, int offset, struct iov_iter *from, int len); int zerocopy_sg_from_iter(struct sk_buff *skb, struct iov_iter *frm); void skb_free_datagram(struct sock *sk, struct sk_buff *skb); void __skb_free_datagram_locked(struct sock *sk, struct sk_buff *skb, int len);
static inline void skb_free_datagram_locked(struct sock *sk, struct sk_buff *skb) { __skb_free_datagram_locked(sk, skb, 0); }

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samanthakumar26100.00%1100.00%
Total26100.00%1100.00%

int skb_kill_datagram(struct sock *sk, struct sk_buff *skb, unsigned int flags); int skb_copy_bits(const struct sk_buff *skb, int offset, void *to, int len); int skb_store_bits(struct sk_buff *skb, int offset, const void *from, int len); __wsum skb_copy_and_csum_bits(const struct sk_buff *skb, int offset, u8 *to, int len, __wsum csum); int skb_splice_bits(struct sk_buff *skb, struct sock *sk, unsigned int offset, struct pipe_inode_info *pipe, unsigned int len, unsigned int flags); int skb_send_sock_locked(struct sock *sk, struct sk_buff *skb, int offset, int len); int skb_send_sock(struct sock *sk, struct sk_buff *skb, int offset, int len); void skb_copy_and_csum_dev(const struct sk_buff *skb, u8 *to); unsigned int skb_zerocopy_headlen(const struct sk_buff *from); int skb_zerocopy(struct sk_buff *to, struct sk_buff *from, int len, int hlen); void skb_split(struct sk_buff *skb, struct sk_buff *skb1, const u32 len); int skb_shift(struct sk_buff *tgt, struct sk_buff *skb, int shiftlen); void skb_scrub_packet(struct sk_buff *skb, bool xnet); unsigned int skb_gso_transport_seglen(const struct sk_buff *skb); bool skb_gso_validate_mtu(const struct sk_buff *skb, unsigned int mtu); struct sk_buff *skb_segment(struct sk_buff *skb, netdev_features_t features); struct sk_buff *skb_vlan_untag(struct sk_buff *skb); int skb_ensure_writable(struct sk_buff *skb, int write_len); int __skb_vlan_pop(struct sk_buff *skb, u16 *vlan_tci); int skb_vlan_pop(struct sk_buff *skb); int skb_vlan_push(struct sk_buff *skb, __be16 vlan_proto, u16 vlan_tci); struct sk_buff *pskb_extract(struct sk_buff *skb, int off, int to_copy, gfp_t gfp);
static inline int memcpy_from_msg(void *data, struct msghdr *msg, int len) { return copy_from_iter_full(data, len, &msg->msg_iter) ? 0 : -EFAULT; }

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Al Viro37100.00%4100.00%
Total37100.00%4100.00%


static inline int memcpy_to_msg(struct msghdr *msg, void *data, int len) { return copy_to_iter(data, len, &msg->msg_iter) == len ? 0 : -EFAULT; }

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Al Viro39100.00%2100.00%
Total39100.00%2100.00%

struct skb_checksum_ops { __wsum (*update)(const void *mem, int len, __wsum wsum); __wsum (*combine)(__wsum csum, __wsum csum2, int offset, int len); }; extern const struct skb_checksum_ops *crc32c_csum_stub __read_mostly; __wsum __skb_checksum(const struct sk_buff *skb, int offset, int len, __wsum csum, const struct skb_checksum_ops *ops); __wsum skb_checksum(const struct sk_buff *skb, int offset, int len, __wsum csum);
static inline void * __must_check __skb_header_pointer(const struct sk_buff *skb, int offset, int len, void *data, int hlen, void *buffer) { if (hlen - offset >= len) return data + offset; if (!skb || skb_copy_bits(skb, offset, buffer, len) < 0) return NULL; return buffer; }

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David S. Miller6594.20%250.00%
Patrick McHardy34.35%125.00%
Eric Dumazet11.45%125.00%
Total69100.00%4100.00%


static inline void * __must_check skb_header_pointer(const struct sk_buff *skb, int offset, int len, void *buffer) { return __skb_header_pointer(skb, offset, len, skb->data, skb_headlen(skb), buffer); }

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David S. Miller4597.83%150.00%
Eric Dumazet12.17%150.00%
Total46100.00%2100.00%

/** * skb_needs_linearize - check if we need to linearize a given skb * depending on the given device features. * @skb: socket buffer to check * @features: net device features * * Returns true if either: * 1. skb has frag_list and the device doesn't support FRAGLIST, or * 2. skb is fragmented and the device does not support SG. */
static inline bool skb_needs_linearize(struct sk_buff *skb, netdev_features_t features) { return skb_is_nonlinear(skb) && ((skb_has_frag_list(skb) && !(features & NETIF_F_FRAGLIST)) || (skb_shinfo(skb)->nr_frags && !(features & NETIF_F_SG))); }

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Daniel Borkmann53100.00%1100.00%
Total53100.00%1100.00%


static inline void skb_copy_from_linear_data(const struct sk_buff *skb, void *to, const unsigned int len) { memcpy(to, skb->data, len); }

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Arnaldo Carvalho de Melo33100.00%1100.00%
Total33100.00%1100.00%


static inline void skb_copy_from_linear_data_offset(const struct sk_buff *skb, const int offset, void *to, const unsigned int len) { memcpy(to, skb->data + offset, len); }

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Arnaldo Carvalho de Melo39100.00%1100.00%
Total39100.00%1100.00%


static inline void skb_copy_to_linear_data(struct sk_buff *skb, const void *from, const unsigned int len) { memcpy(skb->data, from, len); }

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Arnaldo Carvalho de Melo33100.00%1100.00%
Total33100.00%1100.00%


static inline void skb_copy_to_linear_data_offset(struct sk_buff *skb, const int offset, const void *from, const unsigned int len) { memcpy(skb->data + offset, from, len); }

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Arnaldo Carvalho de Melo39100.00%1100.00%
Total39100.00%1100.00%

void skb_init(void);
static inline ktime_t skb_get_ktime(const struct sk_buff *skb) { return skb->tstamp; }

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Patrick Ohly18100.00%1100.00%
Total18100.00%1100.00%

/** * skb_get_timestamp - get timestamp from a skb * @skb: skb to get stamp from * @stamp: pointer to struct timeval to store stamp in * * Timestamps are stored in the skb as offsets to a base timestamp. * This function converts the offset back to a struct timeval and stores * it in stamp. */
static inline void skb_get_timestamp(const struct sk_buff *skb, struct timeval *stamp) { *stamp = ktime_to_timeval(skb->tstamp); }

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Patrick McHardy2382.14%133.33%
Eric Dumazet414.29%133.33%
Stephen Hemminger13.57%133.33%
Total28100.00%3100.00%


static inline void skb_get_timestampns(const struct sk_buff *skb, struct timespec *stamp) { *stamp = ktime_to_timespec(skb->tstamp); }

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Patrick Ohly28100.00%1100.00%
Total28100.00%1100.00%


static inline void __net_timestamp(struct sk_buff *skb) { skb->tstamp = ktime_get_real(); }

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Patrick McHardy1684.21%150.00%
Eric Dumazet315.79%150.00%
Total19100.00%2100.00%


static inline ktime_t net_timedelta(ktime_t t) { return ktime_sub(ktime_get_real(), t); }

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Stephen Hemminger19100.00%1100.00%
Total19100.00%1100.00%


static inline ktime_t net_invalid_timestamp(void) { return 0; }

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Ilpo Järvinen12100.00%1100.00%
Total12100.00%1100.00%


static inline u8 skb_metadata_len(const struct sk_buff *skb) { return skb_shinfo(skb)->meta_len; }

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Daniel Borkmann21100.00%1100.00%
Total21100.00%1100.00%


static inline void *skb_metadata_end(const struct sk_buff *skb) { return skb_mac_header(skb); }

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Daniel Borkmann20100.00%1100.00%
Total20100.00%1100.00%


static inline bool __skb_metadata_differs(const struct sk_buff *skb_a, const struct sk_buff *skb_b, u8 meta_len) { const void *a = skb_metadata_end(skb_a); const void *b = skb_metadata_end(skb_b); /* Using more efficient varaiant than plain call to memcmp(). */ #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 u64 diffs = 0; switch (meta_len) { #define __it(x, op) (x -= sizeof(u##op)) #define __it_diff(a, b, op) (*(u##op *)__it(a, op)) ^ (*(u##op *)__it(b, op)) case 32: diffs |= __it_diff(a, b, 64); case 24: diffs |= __it_diff(a, b, 64); case 16: diffs |= __it_diff(a, b, 64); case 8: diffs |= __it_diff(a, b, 64); break; case 28: diffs |= __it_diff(a, b, 64); case 20: diffs |= __it_diff(a, b, 64); case 12: diffs |= __it_diff(a, b, 64); case 4: diffs |= __it_diff(a, b, 32); break; } return diffs; #else return memcmp(a - meta_len, b - meta_len, meta_len); #endif }

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Daniel Borkmann219100.00%1100.00%
Total219100.00%1100.00%


static inline bool skb_metadata_differs(const struct sk_buff *skb_a, const struct sk_buff *skb_b) { u8 len_a = skb_metadata_len(skb_a); u8 len_b = skb_metadata_len(skb_b); if (!(len_a | len_b)) return false; return len_a != len_b ? true : __skb_metadata_differs(skb_a, skb_b, len_a); }

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Daniel Borkmann63100.00%1100.00%
Total63100.00%1100.00%


static inline void skb_metadata_set(struct sk_buff *skb, u8 meta_len) { skb_shinfo(skb)->meta_len = meta_len; }

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Daniel Borkmann24100.00%1100.00%
Total24100.00%1100.00%


static inline void skb_metadata_clear(struct sk_buff *skb) { skb_metadata_set(skb, 0); }

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Daniel Borkmann19100.00%1100.00%
Total19100.00%1100.00%

struct sk_buff *skb_clone_sk(struct sk_buff *skb); #ifdef CONFIG_NETWORK_PHY_TIMESTAMPING void skb_clone_tx_timestamp(struct sk_buff *skb); bool skb_defer_rx_timestamp(struct sk_buff *skb); #else /* CONFIG_NETWORK_PHY_TIMESTAMPING */
static inline void skb_clone_tx_timestamp(struct sk_buff *skb) { }

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Richard Cochran11100.00%1100.00%
Total11100.00%1100.00%


static inline bool skb_defer_rx_timestamp(struct sk_buff *skb) { return false; }

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Richard Cochran15100.00%1100.00%
Total15100.00%1100.00%

#endif /* !CONFIG_NETWORK_PHY_TIMESTAMPING */ /** * skb_complete_tx_timestamp() - deliver cloned skb with tx timestamps * * PHY drivers may accept clones of transmitted packets for * timestamping via their phy_driver.txtstamp method. These drivers * must call this function to return the skb back to the stack with a * timestamp. * * @skb: clone of the the original outgoing packet * @hwtstamps: hardware time stamps * */ void skb_complete_tx_timestamp(struct sk_buff *skb, struct skb_shared_hwtstamps *hwtstamps); void __skb_tstamp_tx(struct sk_buff *orig_skb, struct skb_shared_hwtstamps *hwtstamps, struct sock *sk, int tstype); /** * skb_tstamp_tx - queue clone of skb with send time stamps * @orig_skb: the original outgoing packet * @hwtstamps: hardware time stamps, may be NULL if not available * * If the skb has a socket associated, then this function clones the * skb (thus sharing the actual data and optional structures), stores * the optional hardware time stamping information (if non NULL) or * generates a software time stamp (otherwise), then queues the clone * to the error queue of the socket. Errors are silently ignored. */ void skb_tstamp_tx(struct sk_buff *orig_skb, struct skb_shared_hwtstamps *hwtstamps); /** * skb_tx_timestamp() - Driver hook for transmit timestamping * * Ethernet MAC Drivers should call this function in their hard_xmit() * function immediately before giving the sk_buff to the MAC hardware. * * Specifically, one should make absolutely sure that this function is * called before TX completion of this packet can trigger. Otherwise * the packet could potentially already be freed. * * @skb: A socket buffer. */
static inline void skb_tx_timestamp(struct sk_buff *skb) { skb_clone_tx_timestamp(skb); if (skb_shinfo(skb)->tx_flags & SKBTX_SW_TSTAMP) skb_tstamp_tx(skb, NULL); }

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Richard Cochran2365.71%133.33%
Oliver Hartkopp617.14%133.33%
Miroslav Lichvar617.14%133.33%
Total35100.00%3100.00%

/** * skb_complete_wifi_ack - deliver skb with wifi status * * @skb: the original outgoing packet * @acked: ack status * */ void skb_complete_wifi_ack(struct sk_buff *skb, bool acked); __sum16 __skb_checksum_complete_head(struct sk_buff *skb, int len); __sum16 __skb_checksum_complete(struct sk_buff *skb);
static inline int skb_csum_unnecessary(const struct sk_buff *skb) { return ((skb->ip_summed == CHECKSUM_UNNECESSARY) || skb->csum_valid || (skb->ip_summed == CHECKSUM_PARTIAL && skb_checksum_start_offset(skb) >= 0)); }

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Tom Herbert2455.81%266.67%
Herbert Xu1944.19%133.33%
Total43100.00%3100.00%

/** * skb_checksum_complete - Calculate checksum of an entire packet * @skb: packet to process * * This function calculates the checksum over the entire packet plus * the value of skb->csum. The latter can be used to supply the * checksum of a pseudo header as used by TCP/UDP. It returns the * checksum. * * For protocols that contain complete checksums such as ICMP/TCP/UDP, * this function can be used to verify that checksum on received * packets. In that case the function should return zero if the * checksum is correct. In particular, this function will return zero * if skb->ip_summed is CHECKSUM_UNNECESSARY which indicates that the * hardware has already verified the correctness of the checksum. */
static inline __sum16 skb_checksum_complete(struct sk_buff *skb) { return skb_csum_unnecessary(skb) ? 0 : __skb_checksum_complete(skb); }

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Herbert Xu2496.00%266.67%
Al Viro14.00%133.33%
Total25100.00%3100.00%


static inline void __skb_decr_checksum_unnecessary(struct sk_buff *skb) { if (skb->ip_summed == CHECKSUM_UNNECESSARY) { if (skb->csum_level == 0) skb->ip_summed = CHECKSUM_NONE; else skb->csum_level--; } }

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Tom Herbert42100.00%1100.00%
Total42100.00%1100.00%


static inline void __skb_incr_checksum_unnecessary(struct sk_buff *skb) { if (skb->ip_summed == CHECKSUM_UNNECESSARY) { if (skb->csum_level < SKB_MAX_CSUM_LEVEL) skb->csum_level++; } else if (skb->ip_summed == CHECKSUM_NONE) { skb->ip_summed = CHECKSUM_UNNECESSARY; skb->csum_level = 0; } }

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Tom Herbert4475.86%266.67%
Herbert Xu1424.14%133.33%
Total58100.00%3100.00%

/* Check if we need to perform checksum complete validation. * * Returns true if checksum complete is needed, false otherwise * (either checksum is unnecessary or zero checksum is allowed). */
static inline bool __skb_checksum_validate_needed(struct sk_buff *skb, bool zero_okay, __sum16 check) { if (skb_csum_unnecessary(skb) || (zero_okay && !check)) { skb->csum_valid = 1; __skb_decr_checksum_unnecessary(skb); return false; } return true; }

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Tom Herbert51100.00%3100.00%
Total51100.00%3100.00%

/* For small packets <= CHECKSUM_BREAK peform checksum complete directly * in checksum_init. */ #define CHECKSUM_BREAK 76 /* Unset checksum-complete * * Unset checksum complete can be done when packet is being modified * (uncompressed for instance) and checksum-complete value is * invalidated. */
static inline void skb_checksum_complete_unset(struct sk_buff *skb) { if (skb->ip_summed == CHECKSUM_COMPLETE) skb->ip_summed = CHECKSUM_NONE; }

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Tom Herbert26100.00%1100.00%
Total26100.00%1100.00%

/* Validate (init) checksum based on checksum complete. * * Return values: * 0: checksum is validated or try to in skb_checksum_complete. In the latter * case the ip_summed will not be CHECKSUM_UNNECESSARY and the pseudo * checksum is stored in skb->csum for use in __skb_checksum_complete * non-zero: value of invalid checksum * */
static inline __sum16 __skb_checksum_validate_complete(struct sk_buff *skb, bool complete, __wsum psum) { if (skb->ip_summed == CHECKSUM_COMPLETE) { if (!csum_fold(csum_add(psum, skb->csum))) { skb->csum_valid = 1; return 0; } } skb->csum = psum; if (complete || skb->len <= CHECKSUM_BREAK) { __sum16 csum; csum = __skb_checksum_complete(skb); skb->csum_valid = !csum; return csum; } return 0; }

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Tom Herbert95100.00%2100.00%
Total95100.00%2100.00%


static inline __wsum null_compute_pseudo(struct sk_buff *skb, int proto) { return 0; }

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Tom Herbert18100.00%1100.00%
Total18100.00%1100.00%

/* Perform checksum validate (init). Note that this is a macro since we only * want to calculate the pseudo header which is an input function if necessary. * First we try to validate without any computation (checksum unnecessary) and * then calculate based on checksum complete calling the function to compute * pseudo header. * * Return values: * 0: checksum is validated or try to in skb_checksum_complete * non-zero: value of invalid checksum */ #define __skb_checksum_validate(skb, proto, complete, \ zero_okay, check, compute_pseudo) \ ({ \ __sum16 __ret = 0; \ skb->csum_valid = 0; \ if (__skb_checksum_validate_needed(skb, zero_okay, check)) \ __ret = __skb_checksum_validate_complete(skb, \ complete, compute_pseudo(skb, proto)); \ __ret; \ }) #define skb_checksum_init(skb, proto, compute_pseudo) \ __skb_checksum_validate(skb, proto, false, false, 0, compute_pseudo) #define skb_checksum_init_zero_check(skb, proto, check, compute_pseudo) \ __skb_checksum_validate(skb, proto, false, true, check, compute_pseudo) #define skb_checksum_validate(skb, proto, compute_pseudo) \ __skb_checksum_validate(skb, proto, true, false, 0, compute_pseudo) #define skb_checksum_validate_zero_check(skb, proto, check, \ compute_pseudo) \ __skb_checksum_validate(skb, proto, true, true, check, compute_pseudo) #define skb_checksum_simple_validate(skb) \ __skb_checksum_validate(skb, 0, true, false, 0, null_compute_pseudo)
static inline bool __skb_checksum_convert_check(struct sk_buff *skb) { return (skb->ip_summed == CHECKSUM_NONE && skb->csum_valid); }

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Tom Herbert25100.00%1100.00%
Total25100.00%1100.00%


static inline void __skb_checksum_convert(struct sk_buff *skb, __sum16 check, __wsum pseudo) { skb->csum = ~pseudo; skb->ip_summed = CHECKSUM_COMPLETE; }

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Tom Herbert31100.00%1100.00%
Total31100.00%1100.00%

#define skb_checksum_try_convert(skb, proto, check, compute_pseudo) \ do { \ if (__skb_checksum_convert_check(skb)) \ __skb_checksum_convert(skb, check, \ compute_pseudo(skb, proto)); \ } while (0)
static inline void skb_remcsum_adjust_partial(struct sk_buff *skb, void *ptr, u16 start, u16 offset) { skb->ip_summed = CHECKSUM_PARTIAL; skb->csum_start = ((unsigned char *)ptr + start) - skb->head; skb->csum_offset = offset - start; }

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PersonTokensPropCommitsCommitProp
Tom Herbert55100.00%1100.00%
Total55100.00%1100.00%

/* Update skbuf and packet to reflect the remote checksum offload operation. * When called, ptr indicates the starting point for skb->csum when * ip_summed is CHECKSUM_COMPLETE. If we need create checksum complete * here, skb_postpull_rcsum is done so skb->csum start is ptr. */
static inline void skb_remcsum_process(struct sk_buff *skb, void *ptr, int start, int offset, bool nopartial) { __wsum delta; if (!nopartial) { skb_remcsum_adjust_partial(skb, ptr, start, offset); return; } if (unlikely(skb->ip_summed != CHECKSUM_COMPLETE)) { __skb_checksum_complete(skb); skb_postpull_rcsum(skb, skb->data, ptr - (void *)skb->data); } delta = remcsum_adjust(ptr, skb->csum, start, offset); /* Adjust skb->csum since we changed the packet */ skb->csum = csum_add(skb->csum, delta); }

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PersonTokensPropCommitsCommitProp
Tom Herbert113100.00%2100.00%
Total113100.00%2100.00%


static inline struct nf_conntrack *skb_nfct(const struct sk_buff *skb) { #if IS_ENABLED(CONFIG_NF_CONNTRACK) return (void *)(skb->_nfct & SKB_NFCT_PTRMASK); #else return NULL; #endif }

Contributors

PersonTokensPropCommitsCommitProp
Florian Westphal41100.00%2100.00%
Total41100.00%2100.00%

#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) void nf_conntrack_destroy(struct nf_conntrack *nfct);
static inline void nf_conntrack_put(struct nf_conntrack *nfct) { if (nfct && atomic_dec_and_test(&nfct->use)) nf_conntrack_destroy(nfct); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)2793.10%250.00%
Patrick McHardy13.45%125.00%
Yasuyuki Kozakai13.45%125.00%
Total29100.00%4100.00%


static inline void nf_conntrack_get(struct nf_conntrack *nfct) { if (nfct) atomic_inc(&nfct->use); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)2395.83%266.67%
Patrick McHardy14.17%133.33%
Total24100.00%3100.00%

#endif #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
static inline void nf_bridge_put(struct nf_bridge_info *nf_bridge) { if (nf_bridge && refcount_dec_and_test(&nf_bridge->use)) kfree(nf_bridge); }

Contributors

PersonTokensPropCommitsCommitProp
Bart De Schuymer2896.55%150.00%
Elena Reshetova13.45%150.00%
Total29100.00%2100.00%


static inline void nf_bridge_get(struct nf_bridge_info *nf_bridge) { if (nf_bridge) refcount_inc(&nf_bridge->use); }

Contributors

PersonTokensPropCommitsCommitProp
Bart De Schuymer2395.83%150.00%
Elena Reshetova14.17%150.00%
Total24100.00%2100.00%

#endif /* CONFIG_BRIDGE_NETFILTER */
static inline void nf_reset(struct sk_buff *skb) { #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) nf_conntrack_put(skb_nfct(skb)); skb->_nfct = 0; #endif #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) nf_bridge_put(skb->nf_bridge); skb->nf_bridge = NULL; #endif }

Contributors

PersonTokensPropCommitsCommitProp
Patrick McHardy3761.67%120.00%
Yasuyuki Kozakai1118.33%120.00%
Florian Westphal58.33%120.00%
Pablo Neira Ayuso58.33%120.00%
KOVACS Krisztian23.33%120.00%
Total60100.00%5100.00%


static inline void nf_reset_trace(struct sk_buff *skb) { #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) || defined(CONFIG_NF_TABLES) skb->nf_trace = 0; #endif }

Contributors

PersonTokensPropCommitsCommitProp
Gao Feng1445.16%125.00%
Patrick McHardy1238.71%250.00%
Florian Westphal516.13%125.00%
Total31100.00%4100.00%


static inline void ipvs_reset(struct sk_buff *skb) { #if IS_ENABLED(CONFIG_IP_VS) skb->ipvs_property = 0; #endif }

Contributors

PersonTokensPropCommitsCommitProp
Ye Yin26100.00%1100.00%
Total26100.00%1100.00%

/* Note: This doesn't put any conntrack and bridge info in dst. */
static inline void __nf_copy(struct sk_buff *dst, const struct sk_buff *src, bool copy) { #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) dst->_nfct = src->_nfct; nf_conntrack_get(skb_nfct(src)); #endif #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) dst->nf_bridge = src->nf_bridge; nf_bridge_get(src->nf_bridge); #endif #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) || defined(CONFIG_NF_TABLES) if (copy) dst->nf_trace = src->nf_trace; #endif }

Contributors

PersonTokensPropCommitsCommitProp
Yasuyuki Kozakai5859.18%228.57%
Florian Westphal2626.53%228.57%
Eric Dumazet77.14%114.29%
Pablo Neira Ayuso55.10%114.29%
KOVACS Krisztian22.04%114.29%
Total98100.00%7100.00%


static inline void nf_copy(struct sk_buff *dst, const struct sk_buff *src) { #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) nf_conntrack_put(skb_nfct(dst)); #endif #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) nf_bridge_put(dst->nf_bridge); #endif __nf_copy(dst, src, true); }

Contributors

PersonTokensPropCommitsCommitProp
Yasuyuki Kozakai5180.95%233.33%
Pablo Neira Ayuso57.94%116.67%
Florian Westphal34.76%116.67%
KOVACS Krisztian23.17%116.67%
Eric Dumazet23.17%116.67%
Total63100.00%6100.00%

#ifdef CONFIG_NETWORK_SECMARK
static inline void skb_copy_secmark(struct sk_buff *to, const struct sk_buff *from) { to->secmark = from->secmark; }

Contributors

PersonTokensPropCommitsCommitProp
James Morris26100.00%1100.00%
Total26100.00%1100.00%


static inline void skb_init_secmark(struct sk_buff *skb) { skb->secmark = 0; }

Contributors

PersonTokensPropCommitsCommitProp
James Morris18100.00%1100.00%
Total18100.00%1100.00%

#else
static inline void skb_copy_secmark(struct sk_buff *to, const struct sk_buff *from) { }

Contributors

PersonTokensPropCommitsCommitProp
James Morris17100.00%1100.00%
Total17100.00%1100.00%


static inline void skb_init_secmark(struct sk_buff *skb) { }

Contributors

PersonTokensPropCommitsCommitProp
James Morris11100.00%1100.00%
Total11100.00%1100.00%

#endif
static inline bool skb_irq_freeable(const struct sk_buff *skb) { return !skb->destructor && #if IS_ENABLED(CONFIG_XFRM) !skb->sp && #endif !skb_nfct(skb) && !skb->_skb_refdst && !skb_has_frag_list(skb); }

Contributors

PersonTokensPropCommitsCommitProp
Eric W. Biedermann4693.88%150.00%
Florian Westphal36.12%150.00%
Total49100.00%2100.00%


static inline void skb_set_queue_mapping(struct sk_buff *skb, u16 queue_mapping) { skb->queue_mapping = queue_mapping; }

Contributors

PersonTokensPropCommitsCommitProp
Peter P. Waskiewicz Jr21100.00%1100.00%
Total21100.00%1100.00%


static inline u16 skb_get_queue_mapping(const struct sk_buff *skb) { return skb->queue_mapping; }

Contributors

PersonTokensPropCommitsCommitProp
Pavel Emelyanov1794.44%150.00%
Stephen Hemminger15.56%150.00%
Total18100.00%2100.00%


static inline void skb_copy_queue_mapping(struct sk_buff *to, const struct sk_buff *from) { to->queue_mapping = from->queue_mapping; }

Contributors

PersonTokensPropCommitsCommitProp
Peter P. Waskiewicz Jr26100.00%1100.00%
Total26100.00%1100.00%


static inline void skb_record_rx_queue(struct sk_buff *skb, u16 rx_queue) { skb->queue_mapping = rx_queue + 1; }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller23100.00%1100.00%
Total23100.00%1100.00%


static inline u16 skb_get_rx_queue(const struct sk_buff *skb) { return skb->queue_mapping - 1; }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller1995.00%150.00%
Stephen Hemminger15.00%150.00%
Total20100.00%2100.00%


static inline bool skb_rx_queue_recorded(const struct sk_buff *skb) { return skb->queue_mapping != 0; }

Contributors

PersonTokensPropCommitsCommitProp
David S. Miller1995.00%150.00%
Stephen Hemminger15.00%150.00%
Total20100.00%2100.00%


static inline void skb_set_dst_pending_confirm(struct sk_buff *skb, u32 val) { skb->dst_pending_confirm = val; }

Contributors

PersonTokensPropCommitsCommitProp
Julian Anastasov21100.00%1100.00%
Total21100.00%1100.00%


static inline bool skb_get_dst_pending_confirm(const struct sk_buff *skb) { return skb->dst_pending_confirm != 0; }

Contributors

PersonTokensPropCommitsCommitProp
Julian Anastasov20100.00%1100.00%
Total20100.00%1100.00%


static inline struct sec_path *skb_sec_path(struct sk_buff *skb) { #ifdef CONFIG_XFRM return skb->sp; #else return NULL; #endif }

Contributors

PersonTokensPropCommitsCommitProp
Alexey Dobriyan2586.21%150.00%
Denis Kirjanov413.79%150.00%
Total29100.00%2100.00%

/* Keeps track of mac header offset relative to skb->head. * It is useful for TSO of Tunneling protocol. e.g. GRE. * For non-tunnel skb it points to skb_mac_header() and for * tunnel skb it points to outer mac header. * Keeps track of level of encapsulation of network headers. */ struct skb_gso_cb { union { int mac_offset; int data_offset; }; int encap_level; __wsum csum; __u16 csum_start; }; #define SKB_SGO_CB_OFFSET 32 #define SKB_GSO_CB(skb) ((struct skb_gso_cb *)((skb)->cb + SKB_SGO_CB_OFFSET))
static inline int skb_tnl_header_len(const struct sk_buff *inner_skb) { return (skb_mac_header(inner_skb) - inner_skb->head) - SKB_GSO_CB(inner_skb)->mac_offset; }

Contributors

PersonTokensPropCommitsCommitProp
Pravin B Shelar32100.00%1100.00%
Total32100.00%1100.00%


static inline int gso_pskb_expand_head(struct sk_buff *skb, int extra) { int new_headroom, headroom; int ret; headroom = skb_headroom(skb); ret = pskb_expand_head(skb, extra, 0, GFP_ATOMIC); if (ret) return ret; new_headroom = skb_headroom(skb); SKB_GSO_CB(skb)->mac_offset += (new_headroom - headroom); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Pravin B Shelar73100.00%1100.00%
Total73100.00%1100.00%


static inline void gso_reset_checksum(struct sk_buff *skb, __wsum res) { /* Do not update partial checksums if remote checksum is enabled. */ if (skb->remcsum_offload) return; SKB_GSO_CB(skb)->csum = res; SKB_GSO_CB(skb)->csum_start = skb_checksum_start(skb) - skb->head; }

Contributors

PersonTokensPropCommitsCommitProp
Alexander Duyck48100.00%1100.00%
Total48100.00%1100.00%

/* Compute the checksum for a gso segment. First compute the checksum value * from the start of transport header to SKB_GSO_CB(skb)->csum_start, and * then add in skb->csum (checksum from csum_start to end of packet). * skb->csum and csum_start are then updated to reflect the checksum of the * resultant packet starting from the transport header-- the resultant checksum * is in the res argument (i.e. normally zero or ~ of checksum of a pseudo * header. */
static inline __sum16 gso_make_checksum(struct sk_buff *skb, __wsum res) { unsigned char *csum_start = skb_transport_header(skb); int plen = (skb->head + SKB_GSO_CB(skb)->csum_start) - csum_start; __wsum partial = SKB_GSO_CB(skb)->csum; SKB_GSO_CB(skb)->csum = res; SKB_GSO_CB(skb)->csum_start = csum_start - skb->head; return csum_fold(csum_partial(csum_start, plen, partial)); }

Contributors

PersonTokensPropCommitsCommitProp
Tom Herbert4652.27%133.33%
Alexander Duyck3640.91%133.33%
Eric Dumazet66.82%133.33%
Total88100.00%3100.00%


static inline bool skb_is_gso(const struct sk_buff *skb) { return skb_shinfo(skb)->gso_size; }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu2095.24%150.00%
David S. Miller14.76%150.00%
Total21100.00%2100.00%

/* Note: Should be called only if skb_is_gso(skb) is true */
static inline bool skb_is_gso_v6(const struct sk_buff *skb) { return skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6; }

Contributors

PersonTokensPropCommitsCommitProp
Brice Goglin2295.65%150.00%
David S. Miller14.35%150.00%
Total23100.00%2100.00%


static inline void skb_gso_reset(struct sk_buff *skb) { skb_shinfo(skb)->gso_size = 0; skb_shinfo(skb)->gso_segs = 0; skb_shinfo(skb)->gso_type = 0; }

Contributors

PersonTokensPropCommitsCommitProp
Daniel Borkmann39100.00%1100.00%
Total39100.00%1100.00%

void __skb_warn_lro_forwarding(const struct sk_buff *skb);
static inline bool skb_warn_if_lro(const struct sk_buff *skb) { /* LRO sets gso_size but not gso_type, whereas if GSO is really * wanted then gso_type will be set. */ const struct skb_shared_info *shinfo = skb_shinfo(skb); if (skb_is_nonlinear(skb) && shinfo->gso_size != 0 && unlikely(shinfo->gso_type == 0)) { __skb_warn_lro_forwarding(skb); return true; } return false; }

Contributors

PersonTokensPropCommitsCommitProp
Ben Hutchings5490.00%133.33%
Alexander Duyck58.33%133.33%
Eric Dumazet11.67%133.33%
Total60100.00%3100.00%


static inline void skb_forward_csum(struct sk_buff *skb) { /* Unfortunately we don't support this one. Any brave souls? */ if (skb->ip_summed == CHECKSUM_COMPLETE) skb->ip_summed = CHECKSUM_NONE; }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu27100.00%1100.00%
Total27100.00%1100.00%

/** * skb_checksum_none_assert - make sure skb ip_summed is CHECKSUM_NONE * @skb: skb to check * * fresh skbs have their ip_summed set to CHECKSUM_NONE. * Instead of forcing ip_summed to CHECKSUM_NONE, we can * use this helper, to document places where we make this assertion. */
static inline void skb_checksum_none_assert(const struct sk_buff *skb) { #ifdef DEBUG BUG_ON(skb->ip_summed != CHECKSUM_NONE); #endif }

Contributors

PersonTokensPropCommitsCommitProp
Eric Dumazet27100.00%2100.00%
Total27100.00%2100.00%

bool skb_partial_csum_set(struct sk_buff *skb, u16 start, u16 off); int skb_checksum_setup(struct sk_buff *skb, bool recalculate); struct sk_buff *skb_checksum_trimmed(struct sk_buff *skb, unsigned int transport_len, __sum16(*skb_chkf)(struct sk_buff *skb)); /** * skb_head_is_locked - Determine if the skb->head is locked down * @skb: skb to check * * The head on skbs build around a head frag can be removed if they are * not cloned. This function returns true if the skb head is locked down * due to either being allocated via kmalloc, or by being a clone with * multiple references to the head. */
static inline bool skb_head_is_locked(const struct sk_buff *skb) { return !skb->head_frag || skb_cloned(skb); }

Contributors

PersonTokensPropCommitsCommitProp
Alexander Duyck24100.00%1100.00%
Total24100.00%1100.00%

/** * skb_gso_network_seglen - Return length of individual segments of a gso packet * * @skb: GSO skb * * skb_gso_network_seglen is used to determine the real size of the * individual segments, including Layer3 (IP, IPv6) and L4 headers (TCP/UDP). * * The MAC/L2 header is not accounted for. */
static inline unsigned int skb_gso_network_seglen(const struct sk_buff *skb) { unsigned int hdr_len = skb_transport_header(skb) - skb_network_header(skb); return hdr_len + skb_gso_transport_seglen(skb); }

Contributors

PersonTokensPropCommitsCommitProp
Florian Westphal36100.00%1100.00%
Total36100.00%1100.00%

/* Local Checksum Offload. * Compute outer checksum based on the assumption that the * inner checksum will be offloaded later. * See Documentation/networking/checksum-offloads.txt for * explanation of how this works. * Fill in outer checksum adjustment (e.g. with sum of outer * pseudo-header) before calling. * Also ensure that inner checksum is in linear data area. */
static inline __wsum lco_csum(struct sk_buff *skb) { unsigned char *csum_start = skb_checksum_start(skb); unsigned char *l4_hdr = skb_transport_header(skb); __wsum partial; /* Start with complement of inner checksum adjustment */ partial = ~csum_unfold(*(__force __sum16 *)(csum_start + skb->csum_offset)); /* Add in checksum of our headers (incl. outer checksum * adjustment filled in by caller) and return result. */ return csum_partial(l4_hdr, csum_start - l4_hdr, partial); }

Contributors

PersonTokensPropCommitsCommitProp
Edward Cree3550.72%150.00%
Alexander Duyck3449.28%150.00%
Total69100.00%2100.00%

#endif /* __KERNEL__ */ #endif /* _LINUX_SKBUFF_H */

Overall Contributors

PersonTokensPropCommitsCommitProp
Tom Herbert149410.63%346.71%
Eric Dumazet12659.00%6212.23%
Linus Torvalds (pre-git)11237.99%438.48%
Daniel Borkmann9586.82%112.17%
David S. Miller9296.61%275.33%
Arnaldo Carvalho de Melo9276.60%132.56%
Willem de Bruijn5894.19%163.16%
Herbert Xu5704.06%265.13%
Linus Torvalds5433.86%71.38%
Alexander Duyck4753.38%163.16%
Ian Campbell3642.59%50.99%
Pravin B Shelar2912.07%81.58%
Joseph Gasparakis2321.65%10.20%
Florian Westphal1871.33%122.37%
Al Viro1801.28%173.35%
Gerrit Renker1781.27%40.79%
Paolo Abeni1671.19%50.99%
Johannes Berg1571.12%81.58%
Yasuyuki Kozakai1551.10%40.79%
Thomas Graf1421.01%50.99%
Patrick McHardy1411.00%91.78%
Stephen Hemminger1230.88%112.17%
Ilpo Järvinen1200.85%71.38%
Pavel Emelyanov1180.84%50.99%
yuan linyu1140.81%10.20%
Patrick Ohly1020.73%10.20%
Richard Cochran900.64%20.39%
James Morris870.62%10.20%
Mel Gorman780.56%30.59%
Bart De Schuymer710.51%20.39%
Julian Anastasov700.50%20.39%
Alexey Kuznetsov690.49%30.59%
Octavian Purdila680.48%10.20%
Hannes Frederic Sowa670.48%40.79%
Kazunori Miyazawa660.47%10.20%
Michael S. Tsirkin660.47%50.99%
Ben Hutchings660.47%20.39%
Florian Fainelli650.46%10.20%
Jiri Pirko630.45%50.99%
Benjamin Poirier580.41%20.39%
Américo Wang560.40%30.59%
Ying Xue550.39%10.20%
Christoph Hellwig550.39%30.59%
Rainer Weikusat550.39%10.20%
Alan Cox540.38%10.20%
Peter P. Waskiewicz Jr470.33%10.20%
Ananda Raju470.33%10.20%
Eric W. Biedermann460.33%10.20%
David Howells410.29%10.20%
Miroslav Lichvar360.26%20.39%
Edward Cree360.26%20.39%
Anton Blanchard350.25%30.59%
Alexey Dobriyan350.25%20.39%
samanthakumar300.21%10.20%
Changli Gao290.21%10.20%
Jens Axboe290.21%10.20%
Michał Mirosław270.19%20.39%
Linus Lüssing270.19%10.20%
Jesper Dangaard Brouer270.19%20.39%
Oliver Hartkopp270.19%20.39%
Ye Yin260.19%10.20%
Krishna Kumar250.18%10.20%
Pablo Neira Ayuso250.18%10.20%
Marcelo Ricardo Leitner240.17%30.59%
Amir Vadai230.16%10.20%
Peter Zijlstra230.16%10.20%
Shirley Ma230.16%10.20%
Brice Goglin220.16%10.20%
Jason (Hui) Wang210.15%20.39%
Jamal Hadi Salim210.15%20.39%
Timo Teräs200.14%10.20%
Fan Du200.14%10.20%
Sowmini Varadhan200.14%10.20%
Mathias Krause180.13%20.39%
Neil Horman180.13%30.59%
Rusty Russell150.11%20.39%
Gao Feng150.11%20.39%
Alexander Aring140.10%10.20%
Shmulik Ladkani130.09%10.20%
Simon Horman130.09%20.39%
James Chapman120.09%10.20%
Paul Durrant120.09%10.20%
Nicolas Dichtel120.09%20.39%
Felix Fietkau120.09%10.20%
Vlad Yasevich110.08%10.20%
Davide Caratti100.07%30.59%
Ido Schimmel100.07%10.20%
Andrew Morton100.07%10.20%
Steffen Klassert100.07%20.39%
Elena Reshetova100.07%30.59%
Yaogong Wang90.06%10.20%
Jörn Engel90.06%10.20%
Christopher Leech90.06%20.39%
KOVACS Krisztian80.06%10.20%
Bernhard Thaler80.06%20.39%
Michal Hocko70.05%10.20%
Ben Greear50.04%10.20%
Konstantin Khlebnikov50.04%10.20%
Michael Chan50.04%10.20%
Yotam Gigi50.04%10.20%
Vijay Subramanian50.04%10.20%
Eliezer Tamir40.03%10.20%
Denis Kirjanov40.03%10.20%
Hans Westgaard Ry40.03%10.20%
Randy Dunlap40.03%10.20%
Paul Gortmaker30.02%10.20%
Fred L. Templin30.02%10.20%
Jozsef Kadlecsik30.02%10.20%
Ingo Molnar30.02%10.20%
Emmanuel Grumbach30.02%10.20%
Tobias Klauser20.01%20.39%
Chuck Lever20.01%10.20%
Jason A. Donenfeld20.01%10.20%
Lucas De Marchi10.01%10.20%
Geert Uytterhoeven10.01%10.20%
Dave Jones10.01%10.20%
Sabrina Dubroca10.01%10.20%
Harald Welte10.01%10.20%
Soheil Hassas Yeganeh10.01%10.20%
Masanari Iida10.01%10.20%
Andi Kleen10.01%10.20%
Mauro Carvalho Chehab10.01%10.20%
Zoltan Kiss10.01%10.20%
Arun Sharma10.01%10.20%
Total14053100.00%507100.00%
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