Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 | /* * Forwarding decision * Linux ethernet bridge * * Authors: * Lennert Buytenhek <buytenh@gnu.org> * * $Id: br_forward.c,v 1.3 2001/06/01 09:28:28 davem Exp $ * * 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/kernel.h> #include <linux/netdevice.h> #include <linux/inetdevice.h> #include <linux/skbuff.h> #include <linux/if_bridge.h> #include <linux/netfilter_bridge.h> #include "br_private.h" static inline int should_deliver(struct net_bridge_port *p, struct sk_buff *skb) { if (skb->dev == p->dev || p->state != BR_STATE_FORWARDING) return 0; return 1; } static int __br_forward_finish(struct sk_buff *skb) { NF_HOOK(PF_BRIDGE, NF_BR_POST_ROUTING, skb, NULL, skb->dev, dev_queue_xmit); return 0; } static void __br_deliver(struct net_bridge_port *to, struct sk_buff *skb) { struct net_device *indev; indev = skb->dev; skb->dev = to->dev; NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_OUT, skb, indev, skb->dev, __br_forward_finish); } static void __br_forward(struct net_bridge_port *to, struct sk_buff *skb) { struct net_device *indev; indev = skb->dev; skb->dev = to->dev; NF_HOOK(PF_BRIDGE, NF_BR_FORWARD, skb, indev, skb->dev, __br_forward_finish); } /* called under bridge lock */ void br_deliver(struct net_bridge_port *to, struct sk_buff *skb) { if (should_deliver(to, skb)) { __br_deliver(to, skb); return; } kfree_skb(skb); } /* called under bridge lock */ void br_forward(struct net_bridge_port *to, struct sk_buff *skb) { if (should_deliver(to, skb)) { __br_forward(to, skb); return; } kfree_skb(skb); } /* called under bridge lock */ static void br_flood(struct net_bridge *br, struct sk_buff *skb, int clone, void (*__packet_hook)(struct net_bridge_port *p, struct sk_buff *skb)) { struct net_bridge_port *p; struct net_bridge_port *prev; if (clone) { struct sk_buff *skb2; if ((skb2 = skb_clone(skb, GFP_ATOMIC)) == NULL) { br->statistics.tx_dropped++; return; } skb = skb2; } prev = NULL; p = br->port_list; while (p != NULL) { if (should_deliver(p, skb)) { if (prev != NULL) { struct sk_buff *skb2; if ((skb2 = skb_clone(skb, GFP_ATOMIC)) == NULL) { br->statistics.tx_dropped++; kfree_skb(skb); return; } __packet_hook(prev, skb2); } prev = p; } p = p->next; } if (prev != NULL) { __packet_hook(prev, skb); return; } kfree_skb(skb); } /* called under bridge lock */ void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb, int clone) { br_flood(br, skb, clone, __br_deliver); } /* called under bridge lock */ void br_flood_forward(struct net_bridge *br, struct sk_buff *skb, int clone) { br_flood(br, skb, clone, __br_forward); } |