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br_forward.c

Version: ~ [ 2.4.0 ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  *      Forwarding decision
  3  *      Linux ethernet bridge
  4  *
  5  *      Authors:
  6  *      Lennert Buytenhek               <buytenh@gnu.org>
  7  *
  8  *      $Id: br_forward.c,v 1.2 2000/02/21 15:51:33 davem Exp $
  9  *
 10  *      This program is free software; you can redistribute it and/or
 11  *      modify it under the terms of the GNU General Public License
 12  *      as published by the Free Software Foundation; either version
 13  *      2 of the License, or (at your option) any later version.
 14  */
 15 
 16 #include <linux/kernel.h>
 17 #include <linux/netdevice.h>
 18 #include <linux/inetdevice.h>
 19 #include <linux/skbuff.h>
 20 #include <linux/if_bridge.h>
 21 #include "br_private.h"
 22 
 23 static inline int should_forward(struct net_bridge_port *p, struct sk_buff *skb)
 24 {
 25         if (skb->dev == p->dev ||
 26             p->state != BR_STATE_FORWARDING)
 27                 return 0;
 28 
 29         return 1;
 30 }
 31 
 32 static void __br_forward(struct net_bridge_port *to, struct sk_buff *skb)
 33 {
 34         skb->dev = to->dev;
 35         dev_queue_xmit(skb);
 36 }
 37 
 38 /* called under bridge lock */
 39 void br_forward(struct net_bridge_port *to, struct sk_buff *skb)
 40 {
 41         if (should_forward(to, skb)) {
 42                 __br_forward(to, skb);
 43                 return;
 44         }
 45 
 46         kfree_skb(skb);
 47 }
 48 
 49 /* called under bridge lock */
 50 void br_flood(struct net_bridge *br, struct sk_buff *skb, int clone)
 51 {
 52         struct net_bridge_port *p;
 53         struct net_bridge_port *prev;
 54 
 55         if (clone) {
 56                 struct sk_buff *skb2;
 57 
 58                 if ((skb2 = skb_clone(skb, GFP_ATOMIC)) == NULL) {
 59                         br->statistics.tx_dropped++;
 60                         return;
 61                 }
 62 
 63                 skb = skb2;
 64         }
 65 
 66         prev = NULL;
 67 
 68         p = br->port_list;
 69         while (p != NULL) {
 70                 if (should_forward(p, skb)) {
 71                         if (prev != NULL) {
 72                                 struct sk_buff *skb2;
 73 
 74                                 if ((skb2 = skb_clone(skb, GFP_ATOMIC)) == NULL) {
 75                                         br->statistics.tx_dropped++;
 76                                         kfree_skb(skb);
 77                                         return;
 78                                 }
 79 
 80                                 __br_forward(prev, skb2);
 81                         }
 82 
 83                         prev = p;
 84                 }
 85 
 86                 p = p->next;
 87         }
 88 
 89         if (prev != NULL) {
 90                 __br_forward(prev, skb);
 91                 return;
 92         }
 93 
 94         kfree_skb(skb);
 95 }
 96

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Linux Cross Reference Linux/net/bridge/br_forward.c

Linux Cross Reference
Linux/net/bridge/br_forward.c