projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 34666d46 PNA |
1 | /* |
| 2 | * Handle firewalling core | |
| 3 | * Linux ethernet bridge | |
| 4 | * | |
| 5 | * Authors: | |
| 6 | * Lennert Buytenhek <[email protected]> | |
| 7 | * Bart De Schuymer <[email protected]> | |
| 8 | * | |
| 9 | * This program is free software; you can redistribute it and/or | |
| 10 | * modify it under the terms of the GNU General Public License | |
| 11 | * as published by the Free Software Foundation; either version | |
| 12 | * 2 of the License, or (at your option) any later version. | |
| 13 | * | |
| 14 | * Lennert dedicates this file to Kerstin Wurdinger. | |
| 15 | */ | |
| 16 | ||
| 17 | #include <linux/module.h> | |
| 18 | #include <linux/kernel.h> | |
| 19 | #include <linux/in_route.h> | |
| 20 | #include <linux/inetdevice.h> | |
| 21 | #include <net/route.h> | |
| 22 | ||
| 23 | #include "br_private.h" | |
| 24 | #ifdef CONFIG_SYSCTL | |
| 25 | #include <linux/sysctl.h> | |
| 26 | #endif | |
| 27 | ||
| 28 | static void fake_update_pmtu(struct dst_entry *dst, struct sock *sk, | |
| 29 | struct sk_buff *skb, u32 mtu) | |
| 30 | { | |
| 31 | } | |
| 32 | ||
| 33 | static void fake_redirect(struct dst_entry *dst, struct sock *sk, | |
| 34 | struct sk_buff *skb) | |
| 35 | { | |
| 36 | } | |
| 37 | ||
| 38 | static u32 *fake_cow_metrics(struct dst_entry *dst, unsigned long old) | |
| 39 | { | |
| 40 | return NULL; | |
| 41 | } | |
| 42 | ||
| 43 | static struct neighbour *fake_neigh_lookup(const struct dst_entry *dst, | |
| 44 | struct sk_buff *skb, | |
| 45 | const void *daddr) | |
| 46 | { | |
| 47 | return NULL; | |
| 48 | } | |
| 49 | ||
| 50 | static unsigned int fake_mtu(const struct dst_entry *dst) | |
| 51 | { | |
| 52 | return dst->dev->mtu; | |
| 53 | } | |
| 54 | ||
| 55 | static struct dst_ops fake_dst_ops = { | |
| 56 | .family = AF_INET, | |
| 34666d46 PNA |
57 | .update_pmtu = fake_update_pmtu, |
| 58 | .redirect = fake_redirect, | |
| 59 | .cow_metrics = fake_cow_metrics, | |
| 60 | .neigh_lookup = fake_neigh_lookup, | |
| 61 | .mtu = fake_mtu, | |
| 62 | }; | |
| 63 | ||
| 64 | /* | |
| 65 | * Initialize bogus route table used to keep netfilter happy. | |
| 66 | * Currently, we fill in the PMTU entry because netfilter | |
| 67 | * refragmentation needs it, and the rt_flags entry because | |
| 68 | * ipt_REJECT needs it. Future netfilter modules might | |
| 69 | * require us to fill additional fields. | |
| 70 | */ | |
| 71 | static const u32 br_dst_default_metrics[RTAX_MAX] = { | |
| 72 | [RTAX_MTU - 1] = 1500, | |
| 73 | }; | |
| 74 | ||
| 75 | void br_netfilter_rtable_init(struct net_bridge *br) | |
| 76 | { | |
| 77 | struct rtable *rt = &br->fake_rtable; | |
| 78 | ||
| 79 | atomic_set(&rt->dst.__refcnt, 1); | |
| 80 | rt->dst.dev = br->dev; | |
| 81 | rt->dst.path = &rt->dst; | |
| 82 | dst_init_metrics(&rt->dst, br_dst_default_metrics, true); | |
| 83 | rt->dst.flags = DST_NOXFRM | DST_FAKE_RTABLE; | |
| 84 | rt->dst.ops = &fake_dst_ops; | |
| 85 | } | |
| 86 | ||
| 87 | int __init br_nf_core_init(void) | |
| 88 | { | |
| 89 | return dst_entries_init(&fake_dst_ops); | |
| 90 | } | |
| 91 | ||
| 92 | void br_nf_core_fini(void) | |
| 93 | { | |
| 94 | dst_entries_destroy(&fake_dst_ops); | |
| 95 | } |