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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - net/bridge/br_input.c
2 * Handle incoming frames
3 * Linux ethernet bridge
6 * Lennert Buytenhek <buytenh@gnu.org>
8 * $Id: br_input.c,v 1.10 2001/12/24 04:50:20 davem Exp $
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.
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"
22 const unsigned char bridge_ula
[6] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 };
24 static int br_pass_frame_up_finish(struct sk_buff
*skb
)
26 netif_receive_skb(skb
);
30 static void br_pass_frame_up(struct net_bridge
*br
, struct sk_buff
*skb
)
32 struct net_device
*indev
;
34 br
->statistics
.rx_packets
++;
35 br
->statistics
.rx_bytes
+= skb
->len
;
40 NF_HOOK(PF_BRIDGE
, NF_BR_LOCAL_IN
, skb
, indev
, NULL
,
41 br_pass_frame_up_finish
);
44 /* note: already called with rcu_read_lock (preempt_disabled) */
45 int br_handle_frame_finish(struct sk_buff
*skb
)
47 const unsigned char *dest
= eth_hdr(skb
)->h_dest
;
48 struct net_bridge_port
*p
= skb
->dev
->br_port
;
49 struct net_bridge
*br
= p
->br
;
50 struct net_bridge_fdb_entry
*dst
;
53 /* insert into forwarding database after filtering to avoid spoofing */
54 br_fdb_update(p
->br
, p
, eth_hdr(skb
)->h_source
);
56 if (br
->dev
->flags
& IFF_PROMISC
) {
59 skb2
= skb_clone(skb
, GFP_ATOMIC
);
62 br_pass_frame_up(br
, skb2
);
67 br_flood_forward(br
, skb
, !passedup
);
69 br_pass_frame_up(br
, skb
);
73 dst
= __br_fdb_get(br
, dest
);
74 if (dst
!= NULL
&& dst
->is_local
) {
76 br_pass_frame_up(br
, skb
);
83 br_forward(dst
->dst
, skb
);
87 br_flood_forward(br
, skb
, 0);
94 * Called via br_handle_frame_hook.
95 * Return 0 if *pskb should be processed furthur
96 * 1 if *pskb is handled
97 * note: already called with rcu_read_lock (preempt_disabled)
99 int br_handle_frame(struct net_bridge_port
*p
, struct sk_buff
**pskb
)
101 struct sk_buff
*skb
= *pskb
;
102 const unsigned char *dest
= eth_hdr(skb
)->h_dest
;
104 if (p
->state
== BR_STATE_DISABLED
)
107 if (!is_valid_ether_addr(eth_hdr(skb
)->h_source
))
110 if (p
->state
== BR_STATE_LEARNING
)
111 br_fdb_update(p
->br
, p
, eth_hdr(skb
)->h_source
);
113 if (p
->br
->stp_enabled
&&
114 !memcmp(dest
, bridge_ula
, 5) &&
117 NF_HOOK(PF_BRIDGE
, NF_BR_LOCAL_IN
, skb
, skb
->dev
,
118 NULL
, br_stp_handle_bpdu
);
123 else if (p
->state
== BR_STATE_FORWARDING
) {
124 if (br_should_route_hook
) {
125 if (br_should_route_hook(pskb
))
128 dest
= eth_hdr(skb
)->h_dest
;
131 if (!compare_ether_addr(p
->br
->dev
->dev_addr
, dest
))
132 skb
->pkt_type
= PACKET_HOST
;
134 NF_HOOK(PF_BRIDGE
, NF_BR_PRE_ROUTING
, skb
, skb
->dev
, NULL
,
135 br_handle_frame_finish
);