cregit-Linux how code gets into the kernel

Release 4.8 net/bridge/br_forward.c

Directory: net/bridge
 *      Forwarding decision
 *      Linux ethernet bridge
 *      Authors:
 *      Lennert Buytenhek               <>
 *      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/err.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/netpoll.h>
#include <linux/skbuff.h>
#include <linux/if_vlan.h>
#include <linux/netfilter_bridge.h>
#include "br_private.h"

/* Don't forward packets to originating port or forwarding disabled */

static inline int should_deliver(const struct net_bridge_port *p, const struct sk_buff *skb) { struct net_bridge_vlan_group *vg; vg = nbp_vlan_group_rcu(p); return ((p->flags & BR_HAIRPIN_MODE) || skb->dev != p->dev) && br_allowed_egress(vg, skb) && p->state == BR_STATE_FORWARDING; }


nikolay aleksandrovnikolay aleksandrov1320.63%225.00%
anna fischeranna fischer914.29%112.50%
stephen hemmingerstephen hemminger711.11%225.00%
vlad yasevichvlad yasevich69.52%112.50%
linus torvaldslinus torvalds11.59%112.50%

int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb) { if (!is_skb_forwardable(skb->dev, skb)) goto drop; skb_push(skb, ETH_HLEN); br_drop_fake_rtable(skb); if (skb->ip_summed == CHECKSUM_PARTIAL && (skb->protocol == htons(ETH_P_8021Q) || skb->protocol == htons(ETH_P_8021AD))) { int depth; if (!__vlan_get_protocol(skb, skb->protocol, &depth)) goto drop; skb_set_network_header(skb, depth); } dev_queue_xmit(skb); return 0; drop: kfree_skb(skb); return 0; }


toshiaki makitatoshiaki makita7157.72%110.00%
linus torvaldslinus torvalds2318.70%110.00%
stephen hemmingerstephen hemminger86.50%220.00%
eric w. biedermaneric w. biederman54.07%110.00%
david s. millerdavid s. miller54.07%110.00%
peter huangpeter huang54.07%110.00%
vlad yasevichvlad yasevich32.44%110.00%
vlad drukkervlad drukker21.63%110.00%
bart de schuymerbart de schuymer10.81%110.00%

int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb) { return NF_HOOK(NFPROTO_BRIDGE, NF_BR_POST_ROUTING, net, sk, skb, NULL, skb->dev, br_dev_queue_push_xmit); }


linus torvaldslinus torvalds2457.14%114.29%
eric w. biedermaneric w. biederman716.67%228.57%
david s. millerdavid s. miller716.67%114.29%
bart de schuymerbart de schuymer24.76%114.29%
jan engelhardtjan engelhardt12.38%114.29%
stephen hemmingerstephen hemminger12.38%114.29%

static void __br_forward(const struct net_bridge_port *to, struct sk_buff *skb, bool local_orig) { struct net_bridge_vlan_group *vg; struct net_device *indev; struct net *net; int br_hook; vg = nbp_vlan_group_rcu(to); skb = br_handle_vlan(to->br, vg, skb); if (!skb) return; indev = skb->dev; skb->dev = to->dev; if (!local_orig) { if (skb_warn_if_lro(skb)) { kfree_skb(skb); return; } br_hook = NF_BR_FORWARD; skb_forward_csum(skb); net = dev_net(indev); } else { if (unlikely(netpoll_tx_running(to->br->dev))) { if (!is_skb_forwardable(skb->dev, skb)) { kfree_skb(skb); } else { skb_push(skb, ETH_HLEN); br_netpoll_send_skb(to, skb); } return; } br_hook = NF_BR_LOCAL_OUT; net = dev_net(skb->dev); indev = NULL; } NF_HOOK(NFPROTO_BRIDGE, br_hook, net, NULL, skb, indev, skb->dev, br_forward_finish); }


nikolay aleksandrovnikolay aleksandrov9746.19%323.08%
herbert xuherbert xu3516.67%17.69%
linus torvaldslinus torvalds2712.86%17.69%
vlad yasevichvlad yasevich2110.00%215.38%
americo wangamerico wang199.05%215.38%
eric w. biedermaneric w. biederman73.33%17.69%
david s. millerdavid s. miller20.95%17.69%
stephen hemmingerstephen hemminger10.48%17.69%
bart de schuymerbart de schuymer10.48%17.69%

static int deliver_clone(const struct net_bridge_port *prev, struct sk_buff *skb, bool local_orig) { struct net_device *dev = BR_INPUT_SKB_CB(skb)->brdev; skb = skb_clone(skb, GFP_ATOMIC); if (!skb) { dev->stats.tx_dropped++; return -ENOMEM; } __br_forward(prev, skb, local_orig); return 0; }


nikolay aleksandrovnikolay aleksandrov3143.66%228.57%
linus torvaldslinus torvalds1014.08%114.29%
vlad yasevichvlad yasevich912.68%114.29%
herbert xuherbert xu45.63%114.29%
stephen hemmingerstephen hemminger11.41%114.29%

/** * br_forward - forward a packet to a specific port * @to: destination port * @skb: packet being forwarded * @local_rcv: packet will be received locally after forwarding * @local_orig: packet is locally originated * * Should be called with rcu_read_lock. */
void br_forward(const struct net_bridge_port *to, struct sk_buff *skb, bool local_rcv, bool local_orig) { if (to && should_deliver(to, skb)) { if (local_rcv) deliver_clone(to, skb, local_orig); else __br_forward(to, skb, local_orig); return; } if (!local_rcv) kfree_skb(skb); }


nikolay aleksandrovnikolay aleksandrov3043.48%225.00%
herbert xuherbert xu1927.54%225.00%
roopa prabhuroopa prabhu22.90%112.50%
michael braunmichael braun11.45%112.50%
stephen hemmingerstephen hemminger11.45%112.50%

static struct net_bridge_port *maybe_deliver( struct net_bridge_port *prev, struct net_bridge_port *p, struct sk_buff *skb, bool local_orig) { int err; if (!should_deliver(p, skb)) return prev; if (!prev) goto out; err = deliver_clone(prev, skb, local_orig); if (err) return ERR_PTR(err); out: return p; }


herbert xuherbert xu7396.05%150.00%
nikolay aleksandrovnikolay aleksandrov33.95%150.00%

/* called under rcu_read_lock */
void br_flood(struct net_bridge *br, struct sk_buff *skb, bool unicast, bool local_rcv, bool local_orig) { u8 igmp_type = br_multicast_igmp_type(skb); struct net_bridge_port *prev = NULL; struct net_bridge_port *p; list_for_each_entry_rcu(p, &br->port_list, list) { /* Do not flood unicast traffic to ports that turn it off */ if (unicast && !(p->flags & BR_FLOOD)) continue; /* Do not flood to ports that enable proxy ARP */ if (p->flags & BR_PROXYARP) continue; if ((p->flags & BR_PROXYARP_WIFI) && BR_INPUT_SKB_CB(skb)->proxyarp_replied) continue; prev = maybe_deliver(prev, p, skb, local_orig); if (IS_ERR(prev)) goto out; if (prev == p) br_multicast_count(p->br, p, skb, igmp_type, BR_MCAST_DIR_TX); } if (!prev) goto out; if (local_rcv) deliver_clone(prev, skb, local_orig); else __br_forward(prev, skb, local_orig); return; out: if (!local_rcv) kfree_skb(skb); }


nikolay aleksandrovnikolay aleksandrov4624.86%433.33%
herbert xuherbert xu3518.92%216.67%
jouni malinenjouni malinen189.73%18.33%
vlad yasevichvlad yasevich179.19%18.33%
kyeyoon parkkyeyoon park105.41%18.33%
stephen hemmingerstephen hemminger84.32%216.67%

#ifdef CONFIG_BRIDGE_IGMP_SNOOPING /* called with rcu_read_lock */
void br_multicast_flood(struct net_bridge_mdb_entry *mdst, struct sk_buff *skb, bool local_rcv, bool local_orig) { struct net_device *dev = BR_INPUT_SKB_CB(skb)->brdev; u8 igmp_type = br_multicast_igmp_type(skb); struct net_bridge *br = netdev_priv(dev); struct net_bridge_port *prev = NULL; struct net_bridge_port_group *p; struct hlist_node *rp; rp = rcu_dereference(hlist_first_rcu(&br->router_list)); p = mdst ? rcu_dereference(mdst->ports) : NULL; while (p || rp) { struct net_bridge_port *port, *lport, *rport; lport = p ? p->port : NULL; rport = rp ? hlist_entry(rp, struct net_bridge_port, rlist) : NULL; port = (unsigned long)lport > (unsigned long)rport ? lport : rport; prev = maybe_deliver(prev, port, skb, local_orig); if (IS_ERR(prev)) goto out; if (prev == port) br_multicast_count(port->br, port, skb, igmp_type, BR_MCAST_DIR_TX); if ((unsigned long)lport >= (unsigned long)port) p = rcu_dereference(p->next); if ((unsigned long)rport >= (unsigned long)port) rp = rcu_dereference(hlist_next_rcu(rp)); } if (!prev) goto out; if (local_rcv) deliver_clone(prev, skb, local_orig); else __br_forward(prev, skb, local_orig); return; out: if (!local_rcv) kfree_skb(skb); }


herbert xuherbert xu21975.00%111.11%
nikolay aleksandrovnikolay aleksandrov4114.04%444.44%
stephen hemmingerstephen hemminger258.56%333.33%
eric dumazeteric dumazet72.40%111.11%


Overall Contributors

herbert xuherbert xu39433.31%612.77%
nikolay aleksandrovnikolay aleksandrov26822.65%612.77%
linus torvaldslinus torvalds887.44%24.26%
toshiaki makitatoshiaki makita716.00%12.13%
vlad yasevichvlad yasevich564.73%48.51%
stephen hemmingerstephen hemminger554.65%817.02%
americo wangamerico wang221.86%24.26%
eric w. biedermaneric w. biederman191.61%24.26%
jouni malinenjouni malinen181.52%12.13%
david s. millerdavid s. miller141.18%12.13%
kyeyoon parkkyeyoon park100.85%12.13%
pablo neira ayusopablo neira ayuso100.85%12.13%
anna fischeranna fischer90.76%12.13%
eric dumazeteric dumazet70.59%12.13%
peter huangpeter huang50.42%12.13%
bart de schuymerbart de schuymer40.34%12.13%
tejun heotejun heo30.25%12.13%
roopa prabhuroopa prabhu20.17%12.13%
vlad drukkervlad drukker20.17%12.13%
michael braunmichael braun10.08%12.13%
tan xiaojuntan xiaojun10.08%12.13%
jan engelhardtjan engelhardt10.08%12.13%
adrian bunkadrian bunk10.08%12.13%
Directory: net/bridge
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