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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
34666d46 PNA |
2 | /* |
3 | * Handle firewalling core | |
4 | * Linux ethernet bridge | |
5 | * | |
6 | * Authors: | |
7 | * Lennert Buytenhek <buytenh@gnu.org> | |
8 | * Bart De Schuymer <bdschuym@pandora.be> | |
9 | * | |
34666d46 PNA |
10 | * Lennert dedicates this file to Kerstin Wurdinger. |
11 | */ | |
12 | ||
13 | #include <linux/module.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/in_route.h> | |
16 | #include <linux/inetdevice.h> | |
17 | #include <net/route.h> | |
18 | ||
19 | #include "br_private.h" | |
20 | #ifdef CONFIG_SYSCTL | |
21 | #include <linux/sysctl.h> | |
22 | #endif | |
23 | ||
24 | static void fake_update_pmtu(struct dst_entry *dst, struct sock *sk, | |
bd085ef6 HL |
25 | struct sk_buff *skb, u32 mtu, |
26 | bool confirm_neigh) | |
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27 | { |
28 | } | |
29 | ||
30 | static void fake_redirect(struct dst_entry *dst, struct sock *sk, | |
31 | struct sk_buff *skb) | |
32 | { | |
33 | } | |
34 | ||
35 | static u32 *fake_cow_metrics(struct dst_entry *dst, unsigned long old) | |
36 | { | |
37 | return NULL; | |
38 | } | |
39 | ||
40 | static struct neighbour *fake_neigh_lookup(const struct dst_entry *dst, | |
41 | struct sk_buff *skb, | |
42 | const void *daddr) | |
43 | { | |
44 | return NULL; | |
45 | } | |
46 | ||
47 | static unsigned int fake_mtu(const struct dst_entry *dst) | |
48 | { | |
49 | return dst->dev->mtu; | |
50 | } | |
51 | ||
52 | static struct dst_ops fake_dst_ops = { | |
53 | .family = AF_INET, | |
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54 | .update_pmtu = fake_update_pmtu, |
55 | .redirect = fake_redirect, | |
56 | .cow_metrics = fake_cow_metrics, | |
57 | .neigh_lookup = fake_neigh_lookup, | |
58 | .mtu = fake_mtu, | |
59 | }; | |
60 | ||
61 | /* | |
62 | * Initialize bogus route table used to keep netfilter happy. | |
63 | * Currently, we fill in the PMTU entry because netfilter | |
64 | * refragmentation needs it, and the rt_flags entry because | |
65 | * ipt_REJECT needs it. Future netfilter modules might | |
66 | * require us to fill additional fields. | |
67 | */ | |
68 | static const u32 br_dst_default_metrics[RTAX_MAX] = { | |
69 | [RTAX_MTU - 1] = 1500, | |
70 | }; | |
71 | ||
72 | void br_netfilter_rtable_init(struct net_bridge *br) | |
73 | { | |
74 | struct rtable *rt = &br->fake_rtable; | |
75 | ||
76 | atomic_set(&rt->dst.__refcnt, 1); | |
77 | rt->dst.dev = br->dev; | |
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78 | dst_init_metrics(&rt->dst, br_dst_default_metrics, true); |
79 | rt->dst.flags = DST_NOXFRM | DST_FAKE_RTABLE; | |
80 | rt->dst.ops = &fake_dst_ops; | |
81 | } | |
82 | ||
83 | int __init br_nf_core_init(void) | |
84 | { | |
85 | return dst_entries_init(&fake_dst_ops); | |
86 | } | |
87 | ||
88 | void br_nf_core_fini(void) | |
89 | { | |
90 | dst_entries_destroy(&fake_dst_ops); | |
91 | } |