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Release 4.15 include/net/ip_tunnels.h

Directory: include/net
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __NET_IP_TUNNELS_H

#define __NET_IP_TUNNELS_H 1

#include <linux/if_tunnel.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/socket.h>
#include <linux/types.h>
#include <linux/u64_stats_sync.h>
#include <linux/bitops.h>

#include <net/dsfield.h>
#include <net/gro_cells.h>
#include <net/inet_ecn.h>
#include <net/netns/generic.h>
#include <net/rtnetlink.h>
#include <net/lwtunnel.h>
#include <net/dst_cache.h>

#if IS_ENABLED(CONFIG_IPV6)
#include <net/ipv6.h>
#include <net/ip6_fib.h>
#include <net/ip6_route.h>
#endif

/* Keep error state on tunnel for 30 sec */

#define IPTUNNEL_ERR_TIMEO	(30*HZ)

/* Used to memset ip_tunnel padding. */

#define IP_TUNNEL_KEY_SIZE	offsetofend(struct ip_tunnel_key, tp_dst)

/* Used to memset ipv4 address padding. */

#define IP_TUNNEL_KEY_IPV4_PAD	offsetofend(struct ip_tunnel_key, u.ipv4.dst)

#define IP_TUNNEL_KEY_IPV4_PAD_LEN				\
	(FIELD_SIZEOF(struct ip_tunnel_key, u) -                \
         FIELD_SIZEOF(struct ip_tunnel_key, u.ipv4))


struct ip_tunnel_key {
	
__be64			tun_id;
	union {
		struct {
			
__be32	src;
			
__be32	dst;
		
} ipv4;
		struct {
			
struct in6_addr src;
			
struct in6_addr dst;
		
} ipv6;
	
} u;
	
__be16			tun_flags;
	
u8			tos;		/* TOS for IPv4, TC for IPv6 */
	
u8			ttl;		/* TTL for IPv4, HL for IPv6 */
	
__be32			label;		/* Flow Label for IPv6 */
	
__be16			tp_src;
	
__be16			tp_dst;
};

/* Flags for ip_tunnel_info mode. */

#define IP_TUNNEL_INFO_TX	0x01	
/* represents tx tunnel parameters */

#define IP_TUNNEL_INFO_IPV6	0x02	
/* key contains IPv6 addresses */

#define IP_TUNNEL_INFO_BRIDGE	0x04	
/* represents a bridged tunnel id */

/* Maximum tunnel options length. */

#define IP_TUNNEL_OPTS_MAX					\
	GENMASK((FIELD_SIZEOF(struct ip_tunnel_info,            \
                              options_len) * BITS_PER_BYTE) - 1, 0)


struct ip_tunnel_info {
	
struct ip_tunnel_key	key;
#ifdef CONFIG_DST_CACHE
	
struct dst_cache	dst_cache;
#endif
	
u8			options_len;
	
u8			mode;
};

/* 6rd prefix/relay information */
#ifdef CONFIG_IPV6_SIT_6RD

struct ip_tunnel_6rd_parm {
	
struct in6_addr		prefix;
	
__be32			relay_prefix;
	
u16			prefixlen;
	
u16			relay_prefixlen;
};
#endif


struct ip_tunnel_encap {
	
u16			type;
	
u16			flags;
	
__be16			sport;
	
__be16			dport;
};


struct ip_tunnel_prl_entry {
	
struct ip_tunnel_prl_entry __rcu *next;
	
__be32				addr;
	
u16				flags;
	
struct rcu_head			rcu_head;
};

struct metadata_dst;


struct ip_tunnel {
	
struct ip_tunnel __rcu	*next;
	
struct hlist_node hash_node;
	
struct net_device	*dev;
	
struct net		*net;	/* netns for packet i/o */

	
unsigned long	err_time;	/* Time when the last ICMP error
                                         * arrived */
	
int		err_count;	/* Number of arrived ICMP errors */

	/* These four fields used only by GRE */
	
u32		i_seqno;	/* The last seen seqno  */
	
u32		o_seqno;	/* The last output seqno */
	
int		tun_hlen;	/* Precalculated header length */

	/* This field used only by ERSPAN */
	
u32		index;		/* ERSPAN type II index */

	
struct dst_cache dst_cache;

	
struct ip_tunnel_parm parms;

	
int		mlink;
	
int		encap_hlen;	/* Encap header length (FOU,GUE) */
	
int		hlen;		/* tun_hlen + encap_hlen */
	
struct ip_tunnel_encap encap;

	/* for SIT */
#ifdef CONFIG_IPV6_SIT_6RD
	
struct ip_tunnel_6rd_parm ip6rd;
#endif
	
struct ip_tunnel_prl_entry __rcu *prl;	/* potential router list */
	
unsigned int		prl_count;	/* # of entries in PRL */
	
unsigned int		ip_tnl_net_id;
	
struct gro_cells	gro_cells;
	
__u32			fwmark;
	
bool			collect_md;
	
bool			ignore_df;
};


#define TUNNEL_CSUM		__cpu_to_be16(0x01)

#define TUNNEL_ROUTING		__cpu_to_be16(0x02)

#define TUNNEL_KEY		__cpu_to_be16(0x04)

#define TUNNEL_SEQ		__cpu_to_be16(0x08)

#define TUNNEL_STRICT		__cpu_to_be16(0x10)

#define TUNNEL_REC		__cpu_to_be16(0x20)

#define TUNNEL_VERSION		__cpu_to_be16(0x40)

#define TUNNEL_NO_KEY		__cpu_to_be16(0x80)

#define TUNNEL_DONT_FRAGMENT    __cpu_to_be16(0x0100)

#define TUNNEL_OAM		__cpu_to_be16(0x0200)

#define TUNNEL_CRIT_OPT		__cpu_to_be16(0x0400)

#define TUNNEL_GENEVE_OPT	__cpu_to_be16(0x0800)

#define TUNNEL_VXLAN_OPT	__cpu_to_be16(0x1000)

#define TUNNEL_NOCACHE		__cpu_to_be16(0x2000)

#define TUNNEL_ERSPAN_OPT	__cpu_to_be16(0x4000)


#define TUNNEL_OPTIONS_PRESENT \
		(TUNNEL_GENEVE_OPT | TUNNEL_VXLAN_OPT | TUNNEL_ERSPAN_OPT)


struct tnl_ptk_info {
	
__be16 flags;
	
__be16 proto;
	
__be32 key;
	
__be32 seq;
	
int hdr_len;
};


#define PACKET_RCVD	0

#define PACKET_REJECT	1

#define PACKET_NEXT	2


#define IP_TNL_HASH_BITS   7

#define IP_TNL_HASH_SIZE   (1 << IP_TNL_HASH_BITS)


struct ip_tunnel_net {
	
struct net_device *fb_tunnel_dev;
	
struct hlist_head tunnels[IP_TNL_HASH_SIZE];
	
struct ip_tunnel __rcu *collect_md_tun;
};


static inline void ip_tunnel_key_init(struct ip_tunnel_key *key, __be32 saddr, __be32 daddr, u8 tos, u8 ttl, __be32 label, __be16 tp_src, __be16 tp_dst, __be64 tun_id, __be16 tun_flags) { key->tun_id = tun_id; key->u.ipv4.src = saddr; key->u.ipv4.dst = daddr; memset((unsigned char *)key + IP_TUNNEL_KEY_IPV4_PAD, 0, IP_TUNNEL_KEY_IPV4_PAD_LEN); key->tos = tos; key->ttl = ttl; key->label = label; key->tun_flags = tun_flags; /* For the tunnel types on the top of IPsec, the tp_src and tp_dst of * the upper tunnel are used. * E.g: GRE over IPSEC, the tp_src and tp_port are zero. */ key->tp_src = tp_src; key->tp_dst = tp_dst; /* Clear struct padding. */ if (sizeof(*key) != IP_TUNNEL_KEY_SIZE) memset((unsigned char *)key + IP_TUNNEL_KEY_SIZE, 0, sizeof(*key) - IP_TUNNEL_KEY_SIZE); }

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Thomas Graf10166.89%120.00%
Jiri Benc2818.54%240.00%
Pravin B Shelar138.61%120.00%
Daniel Borkmann95.96%120.00%
Total151100.00%5100.00%


static inline bool ip_tunnel_dst_cache_usable(const struct sk_buff *skb, const struct ip_tunnel_info *info) { if (skb->mark) return false; if (!info) return true; if (info->key.tun_flags & TUNNEL_NOCACHE) return false; return true; }

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Daniel Borkmann52100.00%1100.00%
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static inline unsigned short ip_tunnel_info_af(const struct ip_tunnel_info *tun_info) { return tun_info->mode & IP_TUNNEL_INFO_IPV6 ? AF_INET6 : AF_INET; }

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Jiri Benc25100.00%1100.00%
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static inline __be64 key32_to_tunnel_id(__be32 key) { #ifdef __BIG_ENDIAN return (__force __be64)key; #else return (__force __be64)((__force u64)key << 32); #endif }

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Amir Vadai39100.00%1100.00%
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/* Returns the least-significant 32 bits of a __be64. */
static inline __be32 tunnel_id_to_key32(__be64 tun_id) { #ifdef __BIG_ENDIAN return (__force __be32)tun_id; #else return (__force __be32)((__force u64)tun_id >> 32); #endif }

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Amir Vadai39100.00%1100.00%
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#ifdef CONFIG_INET int ip_tunnel_init(struct net_device *dev); void ip_tunnel_uninit(struct net_device *dev); void ip_tunnel_dellink(struct net_device *dev, struct list_head *head); struct net *ip_tunnel_get_link_net(const struct net_device *dev); int ip_tunnel_get_iflink(const struct net_device *dev); int ip_tunnel_init_net(struct net *net, unsigned int ip_tnl_net_id, struct rtnl_link_ops *ops, char *devname); void ip_tunnel_delete_nets(struct list_head *list_net, unsigned int id, struct rtnl_link_ops *ops); void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, const struct iphdr *tnl_params, const u8 protocol); void ip_md_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, const u8 proto); int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd); int __ip_tunnel_change_mtu(struct net_device *dev, int new_mtu, bool strict); int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu); void ip_tunnel_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *tot); struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn, int link, __be16 flags, __be32 remote, __be32 local, __be32 key); int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb, const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst, bool log_ecn_error); int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[], struct ip_tunnel_parm *p, __u32 fwmark); int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[], struct ip_tunnel_parm *p, __u32 fwmark); void ip_tunnel_setup(struct net_device *dev, unsigned int net_id); struct ip_tunnel_encap_ops { size_t (*encap_hlen)(struct ip_tunnel_encap *e); int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e, u8 *protocol, struct flowi4 *fl4); }; #define MAX_IPTUN_ENCAP_OPS 8 extern const struct ip_tunnel_encap_ops __rcu * iptun_encaps[MAX_IPTUN_ENCAP_OPS]; int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *op, unsigned int num); int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *op, unsigned int num); int ip_tunnel_encap_setup(struct ip_tunnel *t, struct ip_tunnel_encap *ipencap);
static inline int ip_encap_hlen(struct ip_tunnel_encap *e) { const struct ip_tunnel_encap_ops *ops; int hlen = -EINVAL; if (e->type == TUNNEL_ENCAP_NONE) return 0; if (e->type >= MAX_IPTUN_ENCAP_OPS) return -EINVAL; rcu_read_lock(); ops = rcu_dereference(iptun_encaps[e->type]); if (likely(ops && ops->encap_hlen)) hlen = ops->encap_hlen(e); rcu_read_unlock(); return hlen; }

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Tom Herbert88100.00%1100.00%
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static inline int ip_tunnel_encap(struct sk_buff *skb, struct ip_tunnel *t, u8 *protocol, struct flowi4 *fl4) { const struct ip_tunnel_encap_ops *ops; int ret = -EINVAL; if (t->encap.type == TUNNEL_ENCAP_NONE) return 0; if (t->encap.type >= MAX_IPTUN_ENCAP_OPS) return -EINVAL; rcu_read_lock(); ops = rcu_dereference(iptun_encaps[t->encap.type]); if (likely(ops && ops->build_header)) ret = ops->build_header(skb, &t->encap, protocol, fl4); rcu_read_unlock(); return ret; }

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Tom Herbert117100.00%1100.00%
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/* Extract dsfield from inner protocol */
static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph, const struct sk_buff *skb) { if (skb->protocol == htons(ETH_P_IP)) return iph->tos; else if (skb->protocol == htons(ETH_P_IPV6)) return ipv6_get_dsfield((const struct ipv6hdr *)iph); else return 0; }

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Pravin B Shelar63100.00%1100.00%
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/* Propogate ECN bits out */
static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph, const struct sk_buff *skb) { u8 inner = ip_tunnel_get_dsfield(iph, skb); return INET_ECN_encapsulate(tos, inner); }

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Pravin B Shelar40100.00%1100.00%
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int __iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto, bool raw_proto, bool xnet);
static inline int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto, bool xnet) { return __iptunnel_pull_header(skb, hdr_len, inner_proto, false, xnet); }

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Jiri Benc35100.00%1100.00%
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void iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb, __be32 src, __be32 dst, u8 proto, u8 tos, u8 ttl, __be16 df, bool xnet); struct metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md, gfp_t flags); int iptunnel_handle_offloads(struct sk_buff *skb, int gso_type_mask);
static inline int iptunnel_pull_offloads(struct sk_buff *skb) { if (skb_is_gso(skb)) { int err; err = skb_unclone(skb, GFP_ATOMIC); if (unlikely(err)) return err; skb_shinfo(skb)->gso_type &= ~(NETIF_F_GSO_ENCAP_ALL >> NETIF_F_GSO_SHIFT); } skb->encapsulation = 0; return 0; }

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Jesse Gross66100.00%1100.00%
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static inline void iptunnel_xmit_stats(struct net_device *dev, int pkt_len) { if (pkt_len > 0) { struct pcpu_sw_netstats *tstats = get_cpu_ptr(dev->tstats); u64_stats_update_begin(&tstats->syncp); tstats->tx_bytes += pkt_len; tstats->tx_packets++; u64_stats_update_end(&tstats->syncp); put_cpu_ptr(tstats); } else { struct net_device_stats *err_stats = &dev->stats; if (pkt_len < 0) { err_stats->tx_errors++; err_stats->tx_aborted_errors++; } else { err_stats->tx_dropped++; } } }

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Pravin B Shelar9993.40%360.00%
Jason A. Donenfeld65.66%120.00%
Li RongQing10.94%120.00%
Total106100.00%5100.00%


static inline void *ip_tunnel_info_opts(struct ip_tunnel_info *info) { return info + 1; }

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Thomas Graf18100.00%1100.00%
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static inline void ip_tunnel_info_opts_get(void *to, const struct ip_tunnel_info *info) { memcpy(to, info + 1, info->options_len); }

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Pravin B Shelar30100.00%1100.00%
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static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info, const void *from, int len) { memcpy(ip_tunnel_info_opts(info), from, len); info->options_len = len; }

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Pravin B Shelar38100.00%1100.00%
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static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate) { return (struct ip_tunnel_info *)lwtstate->data; }

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Thomas Graf24100.00%1100.00%
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extern struct static_key ip_tunnel_metadata_cnt; /* Returns > 0 if metadata should be collected */
static inline int ip_tunnel_collect_metadata(void) { return static_key_false(&ip_tunnel_metadata_cnt); }

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Thomas Graf16100.00%1100.00%
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void __init ip_tunnel_core_init(void); void ip_tunnel_need_metadata(void); void ip_tunnel_unneed_metadata(void); #else /* CONFIG_INET */
static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate) { return NULL; }

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Thomas Graf17100.00%1100.00%
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static inline void ip_tunnel_need_metadata(void) { }

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Thomas Graf8100.00%1100.00%
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static inline void ip_tunnel_unneed_metadata(void) { }

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Thomas Graf8100.00%1100.00%
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static inline void ip_tunnel_info_opts_get(void *to, const struct ip_tunnel_info *info) { }

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Daniel Borkmann16100.00%1100.00%
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static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info, const void *from, int len) { info->options_len = 0; }

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Daniel Borkmann26100.00%1100.00%
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#endif /* CONFIG_INET */ #endif /* __NET_IP_TUNNELS_H */

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Pravin B Shelar81839.81%711.11%
Tom Herbert33416.25%34.76%
Thomas Graf27413.33%711.11%
Jiri Benc1748.47%1015.87%
Daniel Borkmann1205.84%46.35%
Amir Vadai793.84%11.59%
Jesse Gross753.65%34.76%
Nicolas Dichtel401.95%69.52%
Eric Dumazet271.31%46.35%
Stephen Hemminger200.97%34.76%
Alexei Starovoitov180.88%11.59%
David Wragg150.73%11.59%
Paolo Abeni130.63%23.17%
William Tu110.54%23.17%
Craig Gallek90.44%11.59%
Andy Zhou80.39%11.59%
Jason A. Donenfeld60.29%11.59%
Roopa Prabhu50.24%11.59%
Alexey Dobriyan30.15%11.59%
Philip A. Prindeville30.15%11.59%
Alexander Duyck10.05%11.59%
Greg Kroah-Hartman10.05%11.59%
Li RongQing10.05%11.59%
Total2055100.00%63100.00%
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