cregit-Linux how code gets into the kernel

Release 4.8 net/ethernet/eth.c

Directory: net/ethernet
 * INET         An implementation of the TCP/IP protocol suite for the LINUX
 *              operating system.  INET is implemented using the  BSD Socket
 *              interface as the means of communication with the user level.
 *              Ethernet-type device handling.
 * Version:     @(#)eth.c       1.0.7   05/25/93
 * Authors:     Ross Biro
 *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 *              Mark Evans, <>
 *              Florian  La Roche, <>
 *              Alan Cox, <>
 * Fixes:
 *              Mr Linux        : Arp problems
 *              Alan Cox        : Generic queue tidyup (very tiny here)
 *              Alan Cox        : eth_header ntohs should be htons
 *              Alan Cox        : eth_rebuild_header missing an htons and
 *                                minor other things.
 *              Tegge           : Arp bug fixes.
 *              Florian         : Removed many unnecessary functions, code cleanup
 *                                and changes for new arp and skbuff.
 *              Alan Cox        : Redid header building to reflect new format.
 *              Alan Cox        : ARP only when compiled with CONFIG_INET
 *              Greg Page       : 802.2 and SNAP stuff.
 *              Alan Cox        : MAC layer pointers/new format.
 *              Paul Gortmaker  : eth_copy_and_sum shouldn't csum padding.
 *              Alan Cox        : Protect against forwarding explosions with
 *                                older network drivers and IFF_ALLMULTI.
 *      Christer Weinigel       : Better rebuild header message.
 *             Andrew Morton    : 26Feb01: kill ether_setup() - use netdev_boot_setup().
 *              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.
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/inet.h>
#include <linux/ip.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/if_ether.h>
#include <linux/of_net.h>
#include <linux/pci.h>
#include <net/dst.h>
#include <net/arp.h>
#include <net/sock.h>
#include <net/ipv6.h>
#include <net/ip.h>
#include <net/dsa.h>
#include <net/flow_dissector.h>
#include <linux/uaccess.h>

__setup("ether=", netdev_boot_setup);

 * eth_header - create the Ethernet header
 * @skb:        buffer to alter
 * @dev:        source device
 * @type:       Ethernet type field
 * @daddr: destination address (NULL leave destination address)
 * @saddr: source address (NULL use device source address)
 * @len:   packet length (<= skb->len)
 * Set the protocol type. For a packet of type ETH_P_802_3/2 we put the length
 * in here instead.

int eth_header(struct sk_buff *skb, struct net_device *dev, unsigned short type, const void *daddr, const void *saddr, unsigned int len) { struct ethhdr *eth = (struct ethhdr *)skb_push(skb, ETH_HLEN); if (type != ETH_P_802_3 && type != ETH_P_802_2) eth->h_proto = htons(type); else eth->h_proto = htons(len); /* * Set the source hardware address. */ if (!saddr) saddr = dev->dev_addr; memcpy(eth->h_source, saddr, ETH_ALEN); if (daddr) { memcpy(eth->h_dest, daddr, ETH_ALEN); return ETH_HLEN; } /* * Anyway, the loopback-device should never use this function... */ if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) { eth_zero_addr(eth->h_dest); return ETH_HLEN; } return -ETH_HLEN; }


jamal hadi salimjamal hadi salim127.95%16.25%
stephen hemmingerstephen hemminger63.97%318.75%
denys vlasenkodenys vlasenko42.65%16.25%
octavian purdilaoctavian purdila42.65%16.25%
kai germaschewskikai germaschewski31.99%16.25%
joe perchesjoe perches10.66%16.25%
eric dumazeteric dumazet10.66%16.25%

EXPORT_SYMBOL(eth_header); /** * eth_get_headlen - determine the length of header for an ethernet frame * @data: pointer to start of frame * @len: total length of frame * * Make a best effort attempt to pull the length for all of the headers for * a given frame in a linear buffer. */
u32 eth_get_headlen(void *data, unsigned int len) { const unsigned int flags = FLOW_DISSECTOR_F_PARSE_1ST_FRAG; const struct ethhdr *eth = (const struct ethhdr *)data; struct flow_keys keys; /* this should never happen, but better safe than sorry */ if (unlikely(len < sizeof(*eth))) return len; /* parse any remaining L2/L3 headers, check for L4 */ if (!skb_flow_dissect_flow_keys_buf(&keys, data, eth->h_proto, sizeof(*eth), len, flags)) return max_t(u32, keys.control.thoff, sizeof(*eth)); /* parse for any L4 headers */ return min_t(u32, __skb_get_poff(NULL, data, &keys, len), len); }


alexander duyckalexander duyck11394.17%233.33%
jesper dangaard brouerjesper dangaard brouer32.50%116.67%
tom herberttom herbert21.67%233.33%
jiri pirkojiri pirko21.67%116.67%

EXPORT_SYMBOL(eth_get_headlen); /** * eth_type_trans - determine the packet's protocol ID. * @skb: received socket data * @dev: receiving network device * * The rule here is that we * assume 802.3 if the type field is short enough to be a length. * This is normal practice and works for any 'now in use' protocol. */
__be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev) { unsigned short _service_access_point; const unsigned short *sap; const struct ethhdr *eth; skb->dev = dev; skb_reset_mac_header(skb); eth = (struct ethhdr *)skb->data; skb_pull_inline(skb, ETH_HLEN); if (unlikely(is_multicast_ether_addr_64bits(eth->h_dest))) { if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast)) skb->pkt_type = PACKET_BROADCAST; else skb->pkt_type = PACKET_MULTICAST; } else if (unlikely(!ether_addr_equal_64bits(eth->h_dest, dev->dev_addr))) skb->pkt_type = PACKET_OTHERHOST; /* * Some variants of DSA tagging don't have an ethertype field * at all, so we check here whether one of those tagging * variants has been configured on the receiving interface, * and if so, set skb->protocol without looking at the packet. */ if (unlikely(netdev_uses_dsa(dev))) return htons(ETH_P_XDSA); if (likely(eth_proto_is_802_3(eth->h_proto))) return eth->h_proto; /* * This is a magic hack to spot IPX packets. Older Novell breaks * the protocol design and runs IPX over 802.3 without an 802.2 LLC * layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This * won't work for fault tolerant netware but does for the rest. */ sap = skb_header_pointer(skb, 0, sizeof(*sap), &_service_access_point); if (sap && *sap == 0xFFFF) return htons(ETH_P_802_3); /* * Real 802.2 LLC */ return htons(ETH_P_802_2); }


eric dumazeteric dumazet3417.09%26.90%
alexander duyckalexander duyck157.54%413.79%
lennert buytenheklennert buytenhek147.04%26.90%
stephen hemmingerstephen hemminger94.52%26.90%
arnaldo carvalho de meloarnaldo carvalho de melo84.02%26.90%
david s. millerdavid s. miller42.01%26.90%
joe perchesjoe perches31.51%13.45%
florian fainelliflorian fainelli21.01%13.45%
kris katterjohnkris katterjohn21.01%13.45%
changli gaochangli gao10.50%13.45%
alexey dobriyanalexey dobriyan10.50%13.45%
kai germaschewskikai germaschewski10.50%13.45%

EXPORT_SYMBOL(eth_type_trans); /** * eth_header_parse - extract hardware address from packet * @skb: packet to extract header from * @haddr: destination buffer */
int eth_header_parse(const struct sk_buff *skb, unsigned char *haddr) { const struct ethhdr *eth = eth_hdr(skb); memcpy(haddr, eth->h_source, ETH_ALEN); return ETH_ALEN; }


arnaldo carvalho de meloarnaldo carvalho de melo37.32%133.33%
stephen hemmingerstephen hemminger24.88%133.33%

EXPORT_SYMBOL(eth_header_parse); /** * eth_header_cache - fill cache entry from neighbour * @neigh: source neighbour * @hh: destination cache entry * @type: Ethernet type field * * Create an Ethernet header template from the neighbour. */
int eth_header_cache(const struct neighbour *neigh, struct hh_cache *hh, __be16 type) { struct ethhdr *eth; const struct net_device *dev = neigh->dev; eth = (struct ethhdr *) (((u8 *) hh->hh_data) + (HH_DATA_OFF(sizeof(*eth)))); if (type == htons(ETH_P_802_3)) return -1; eth->h_proto = type; memcpy(eth->h_source, dev->dev_addr, ETH_ALEN); memcpy(eth->h_dest, neigh->ha, ETH_ALEN); hh->hh_len = ETH_HLEN; return 0; }


david s. millerdavid s. miller2521.19%216.67%
stephen hemmingerstephen hemminger43.39%216.67%
al viroal viro10.85%18.33%
hideaki yoshifujihideaki yoshifuji10.85%18.33%

EXPORT_SYMBOL(eth_header_cache); /** * eth_header_cache_update - update cache entry * @hh: destination cache entry * @dev: network device * @haddr: new hardware address * * Called by Address Resolution module to notify changes in address. */
void eth_header_cache_update(struct hh_cache *hh, const struct net_device *dev, const unsigned char *haddr) { memcpy(((u8 *) hh->hh_data) + HH_DATA_OFF(sizeof(struct ethhdr)), haddr, ETH_ALEN); }


david s. millerdavid s. miller816.67%114.29%
stephen hemmingerstephen hemminger36.25%228.57%

EXPORT_SYMBOL(eth_header_cache_update); /** * eth_prepare_mac_addr_change - prepare for mac change * @dev: network device * @p: socket address */
int eth_prepare_mac_addr_change(struct net_device *dev, void *p) { struct sockaddr *addr = p; if (!(dev->priv_flags & IFF_LIVE_ADDR_CHANGE) && netif_running(dev)) return -EBUSY; if (!is_valid_ether_addr(addr->sa_data)) return -EADDRNOTAVAIL; return 0; }


christoph hellwigchristoph hellwig3051.72%125.00%
patrick mchardypatrick mchardy1424.14%125.00%
jiri pirkojiri pirko915.52%125.00%
stefan hajnoczistefan hajnoczi58.62%125.00%

EXPORT_SYMBOL(eth_prepare_mac_addr_change); /** * eth_commit_mac_addr_change - commit mac change * @dev: network device * @p: socket address */
void eth_commit_mac_addr_change(struct net_device *dev, void *p) { struct sockaddr *addr = p; memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); }


stefan hajnoczistefan hajnoczi2161.76%133.33%
christoph hellwigchristoph hellwig1235.29%133.33%
stephen hemmingerstephen hemminger12.94%133.33%

EXPORT_SYMBOL(eth_commit_mac_addr_change); /** * eth_mac_addr - set new Ethernet hardware address * @dev: network device * @p: socket address * * Change hardware address of device. * * This doesn't change hardware matching, so needs to be overridden * for most real devices. */
int eth_mac_addr(struct net_device *dev, void *p) { int ret; ret = eth_prepare_mac_addr_change(dev, p); if (ret < 0) return ret; eth_commit_mac_addr_change(dev, p); return 0; }


stefan hajnoczistefan hajnoczi4191.11%150.00%
christoph hellwigchristoph hellwig48.89%150.00%

EXPORT_SYMBOL(eth_mac_addr); /** * eth_change_mtu - set new MTU size * @dev: network device * @new_mtu: new Maximum Transfer Unit * * Allow changing MTU size. Needs to be overridden for devices * supporting jumbo frames. */
int eth_change_mtu(struct net_device *dev, int new_mtu) { if (new_mtu < 68 || new_mtu > ETH_DATA_LEN) return -EINVAL; dev->mtu = new_mtu; return 0; }


christoph hellwigchristoph hellwig3597.22%150.00%
kris katterjohnkris katterjohn12.78%150.00%

int eth_validate_addr(struct net_device *dev) { if (!is_valid_ether_addr(dev->dev_addr)) return -EADDRNOTAVAIL; return 0; }


jeff garzikjeff garzik2696.30%150.00%
patrick mchardypatrick mchardy13.70%150.00%

EXPORT_SYMBOL(eth_validate_addr); const struct header_ops eth_header_ops ____cacheline_aligned = { .create = eth_header, .parse = eth_header_parse, .cache = eth_header_cache, .cache_update = eth_header_cache_update, }; /** * ether_setup - setup Ethernet network device * @dev: network device * * Fill in the fields of the device structure with Ethernet-generic values. */
void ether_setup(struct net_device *dev) { dev->header_ops = &eth_header_ops; dev->type = ARPHRD_ETHER; dev->hard_header_len = ETH_HLEN; dev->mtu = ETH_DATA_LEN; dev->addr_len = ETH_ALEN; dev->tx_queue_len = 1000; /* Ethernet wants good queues */ dev->flags = IFF_BROADCAST|IFF_MULTICAST; dev->priv_flags |= IFF_TX_SKB_SHARING; eth_broadcast_addr(dev->broadcast); }


christoph hellwigchristoph hellwig5681.16%114.29%
neil hormanneil horman68.70%228.57%
stephen hemmingerstephen hemminger34.35%114.29%
jeff garzikjeff garzik22.90%114.29%
kris katterjohnkris katterjohn11.45%114.29%
joe perchesjoe perches11.45%114.29%

EXPORT_SYMBOL(ether_setup); /** * alloc_etherdev_mqs - Allocates and sets up an Ethernet device * @sizeof_priv: Size of additional driver-private structure to be allocated * for this Ethernet device * @txqs: The number of TX queues this device has. * @rxqs: The number of RX queues this device has. * * Fill in the fields of the device structure with Ethernet-generic * values. Basically does everything except registering the device. * * Constructs a new net device, complete with a private data area of * size (sizeof_priv). A 32-byte (not bit) alignment is enforced for * this private data area. */
struct net_device *alloc_etherdev_mqs(int sizeof_priv, unsigned int txqs, unsigned int rxqs) { return alloc_netdev_mqs(sizeof_priv, "eth%d", NET_NAME_UNKNOWN, ether_setup, txqs, rxqs); }


christoph hellwigchristoph hellwig1852.94%125.00%
tom herberttom herbert1029.41%125.00%
peter p waskiewiczpeter p waskiewicz411.76%125.00%
tom gundersentom gundersen25.88%125.00%

ssize_t sysfs_format_mac(char *buf, const unsigned char *addr, int len) { return scnprintf(buf, PAGE_SIZE, "%*phC\n", len, addr); }


michael chanmichael chan2475.00%125.00%
david s. millerdavid s. miller412.50%125.00%
joe perchesjoe perches39.38%125.00%
changli gaochangli gao13.12%125.00%

struct sk_buff **eth_gro_receive(struct sk_buff **head, struct sk_buff *skb) { struct sk_buff *p, **pp = NULL; struct ethhdr *eh, *eh2; unsigned int hlen, off_eth; const struct packet_offload *ptype; __be16 type; int flush = 1; off_eth = skb_gro_offset(skb); hlen = off_eth + sizeof(*eh); eh = skb_gro_header_fast(skb, off_eth); if (skb_gro_header_hard(skb, hlen)) { eh = skb_gro_header_slow(skb, hlen, off_eth); if (unlikely(!eh)) goto out; } flush = 0; for (p = *head; p; p = p->next) { if (!NAPI_GRO_CB(p)->same_flow) continue; eh2 = (struct ethhdr *)(p->data + off_eth); if (compare_ether_header(eh, eh2)) { NAPI_GRO_CB(p)->same_flow = 0; continue; } } type = eh->h_proto; rcu_read_lock(); ptype = gro_find_receive_by_type(type); if (ptype == NULL) { flush = 1; goto out_unlock; } skb_gro_pull(skb, sizeof(*eh)); skb_gro_postpull_rcsum(skb, eh, sizeof(*eh)); pp = ptype->callbacks.gro_receive(head, skb); out_unlock: rcu_read_unlock(); out: NAPI_GRO_CB(skb)->flush |= flush; return pp; }


jesse grossjesse gross272100.00%1100.00%

int eth_gro_complete(struct sk_buff *skb, int nhoff) { struct ethhdr *eh = (struct ethhdr *)(skb->data + nhoff); __be16 type = eh->h_proto; struct packet_offload *ptype; int err = -ENOSYS; if (skb->encapsulation) skb_set_inner_mac_header(skb, nhoff); rcu_read_lock(); ptype = gro_find_complete_by_type(type); if (ptype != NULL) err = ptype->callbacks.gro_complete(skb, nhoff + sizeof(struct ethhdr)); rcu_read_unlock(); return err; }


jesse grossjesse gross103100.00%1100.00%

EXPORT_SYMBOL(eth_gro_complete); static struct packet_offload eth_packet_offload __read_mostly = { .type = cpu_to_be16(ETH_P_TEB), .priority = 10, .callbacks = { .gro_receive = eth_gro_receive, .gro_complete = eth_gro_complete, }, };
static int __init eth_offload_init(void) { dev_add_offload(&eth_packet_offload); return 0; }


jesse grossjesse gross18100.00%1100.00%

unsigned char * __weak arch_get_platform_mac_address(void) { return NULL; }


david s. millerdavid s. miller13100.00%1100.00%

int eth_platform_get_mac_address(struct device *dev, u8 *mac_addr) { const unsigned char *addr; struct device_node *dp; if (dev_is_pci(dev)) dp = pci_device_to_OF_node(to_pci_dev(dev)); else dp = dev->of_node; addr = NULL; if (dp) addr = of_get_mac_address(dp); if (!addr) addr = arch_get_platform_mac_address(); if (!addr) return -ENODEV; ether_addr_copy(mac_addr, addr); return 0; }


david s. millerdavid s. miller93100.00%1100.00%


Overall Contributors

jesse grossjesse gross43924.94%11.14%
christoph hellwigchristoph hellwig1649.32%11.14%
david s. millerdavid s. miller1639.26%77.95%
alexander duyckalexander duyck1337.56%66.82%
stephen hemmingerstephen hemminger1005.68%77.95%
stefan hajnoczistefan hajnoczi804.55%11.14%
eric dumazeteric dumazet351.99%33.41%
michael chanmichael chan291.65%11.14%
jeff garzikjeff garzik281.59%11.14%
lennert buytenheklennert buytenhek170.97%22.27%
patrick mchardypatrick mchardy150.85%22.27%
jiri pirkojiri pirko140.80%33.41%
arnaldo carvalho de meloarnaldo carvalho de melo140.80%44.55%
tom herberttom herbert130.74%33.41%
jamal hadi salimjamal hadi salim120.68%11.14%
joe perchesjoe perches80.45%33.41%
kris katterjohnkris katterjohn70.40%22.27%
neil hormanneil horman60.34%22.27%
octavian purdilaoctavian purdila50.28%11.14%
peter p waskiewiczpeter p waskiewicz40.23%11.14%
denys vlasenkodenys vlasenko40.23%11.14%
kai germaschewskikai germaschewski40.23%22.27%
jesper dangaard brouerjesper dangaard brouer30.17%11.14%
florian fainelliflorian fainelli20.11%11.14%
hideaki yoshifujihideaki yoshifuji20.11%22.27%
changli gaochangli gao20.11%22.27%
ben hutchingsben hutchings20.11%11.14%
tom gundersentom gundersen20.11%11.14%
al viroal viro10.06%11.14%
randy dunlaprandy dunlap10.06%11.14%
masanari iidamasanari iida10.06%11.14%
alexey dobriyanalexey dobriyan10.06%11.14%
avinash kumaravinash kumar10.06%11.14%
linus torvaldslinus torvalds10.06%11.14%
Directory: net/ethernet
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