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1da177e4 LT |
1 | /* |
2 | * Handle incoming frames | |
3 | * Linux ethernet bridge | |
4 | * | |
5 | * Authors: | |
6 | * Lennert Buytenhek <buytenh@gnu.org> | |
7 | * | |
8 | * $Id: br_input.c,v 1.10 2001/12/24 04:50:20 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/etherdevice.h> | |
19 | #include <linux/netfilter_bridge.h> | |
20 | #include "br_private.h" | |
21 | ||
22 | const unsigned char bridge_ula[6] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 }; | |
23 | ||
24 | static int br_pass_frame_up_finish(struct sk_buff *skb) | |
25 | { | |
26 | #ifdef CONFIG_NETFILTER_DEBUG | |
27 | skb->nf_debug = 0; | |
28 | #endif | |
29 | netif_rx(skb); | |
30 | ||
31 | return 0; | |
32 | } | |
33 | ||
34 | static void br_pass_frame_up(struct net_bridge *br, struct sk_buff *skb) | |
35 | { | |
36 | struct net_device *indev; | |
37 | ||
38 | br->statistics.rx_packets++; | |
39 | br->statistics.rx_bytes += skb->len; | |
40 | ||
41 | indev = skb->dev; | |
42 | skb->dev = br->dev; | |
43 | ||
44 | NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, indev, NULL, | |
45 | br_pass_frame_up_finish); | |
46 | } | |
47 | ||
48 | /* note: already called with rcu_read_lock (preempt_disabled) */ | |
49 | int br_handle_frame_finish(struct sk_buff *skb) | |
50 | { | |
51 | const unsigned char *dest = eth_hdr(skb)->h_dest; | |
52 | struct net_bridge_port *p = skb->dev->br_port; | |
53 | struct net_bridge *br = p->br; | |
54 | struct net_bridge_fdb_entry *dst; | |
55 | int passedup = 0; | |
56 | ||
57 | if (br->dev->flags & IFF_PROMISC) { | |
58 | struct sk_buff *skb2; | |
59 | ||
60 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
61 | if (skb2 != NULL) { | |
62 | passedup = 1; | |
63 | br_pass_frame_up(br, skb2); | |
64 | } | |
65 | } | |
66 | ||
67 | if (dest[0] & 1) { | |
68 | br_flood_forward(br, skb, !passedup); | |
69 | if (!passedup) | |
70 | br_pass_frame_up(br, skb); | |
71 | goto out; | |
72 | } | |
73 | ||
74 | dst = __br_fdb_get(br, dest); | |
75 | if (dst != NULL && dst->is_local) { | |
76 | if (!passedup) | |
77 | br_pass_frame_up(br, skb); | |
78 | else | |
79 | kfree_skb(skb); | |
80 | goto out; | |
81 | } | |
82 | ||
83 | if (dst != NULL) { | |
84 | br_forward(dst->dst, skb); | |
85 | goto out; | |
86 | } | |
87 | ||
88 | br_flood_forward(br, skb, 0); | |
89 | ||
90 | out: | |
91 | return 0; | |
92 | } | |
93 | ||
94 | /* | |
95 | * Called via br_handle_frame_hook. | |
96 | * Return 0 if *pskb should be processed furthur | |
97 | * 1 if *pskb is handled | |
98 | * note: already called with rcu_read_lock (preempt_disabled) | |
99 | */ | |
100 | int br_handle_frame(struct net_bridge_port *p, struct sk_buff **pskb) | |
101 | { | |
102 | struct sk_buff *skb = *pskb; | |
103 | const unsigned char *dest = eth_hdr(skb)->h_dest; | |
104 | ||
105 | if (p->state == BR_STATE_DISABLED) | |
106 | goto err; | |
107 | ||
108 | if (!is_valid_ether_addr(eth_hdr(skb)->h_source)) | |
109 | goto err; | |
110 | ||
111 | if (p->state == BR_STATE_LEARNING || | |
112 | p->state == BR_STATE_FORWARDING) | |
113 | br_fdb_update(p->br, p, eth_hdr(skb)->h_source); | |
114 | ||
115 | if (p->br->stp_enabled && | |
116 | !memcmp(dest, bridge_ula, 5) && | |
117 | !(dest[5] & 0xF0)) { | |
118 | if (!dest[5]) { | |
119 | NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, skb->dev, | |
120 | NULL, br_stp_handle_bpdu); | |
121 | return 1; | |
122 | } | |
123 | } | |
124 | ||
125 | else if (p->state == BR_STATE_FORWARDING) { | |
126 | if (br_should_route_hook) { | |
127 | if (br_should_route_hook(pskb)) | |
128 | return 0; | |
129 | skb = *pskb; | |
130 | dest = eth_hdr(skb)->h_dest; | |
131 | } | |
132 | ||
133 | if (!memcmp(p->br->dev->dev_addr, dest, ETH_ALEN)) | |
134 | skb->pkt_type = PACKET_HOST; | |
135 | ||
136 | NF_HOOK(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL, | |
137 | br_handle_frame_finish); | |
138 | return 1; | |
139 | } | |
140 | ||
141 | err: | |
142 | kfree_skb(skb); | |
143 | return 1; | |
144 | } |