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1 | /* |
2 | * broadcast connection tracking helper |
3 | * |
4 | * (c) 2005 Patrick McHardy <kaber@trash.net> |
5 | * |
6 | * This program is free software; you can redistribute it and/or |
7 | * modify it under the terms of the GNU General Public License |
8 | * as published by the Free Software Foundation; either version |
9 | * 2 of the License, or (at your option) any later version. |
10 | */ |
11 | |
12 | #include <linux/module.h> |
13 | #include <linux/ip.h> |
14 | #include <net/route.h> |
15 | #include <linux/inetdevice.h> |
16 | #include <linux/skbuff.h> |
17 | |
18 | #include <net/netfilter/nf_conntrack.h> |
19 | #include <net/netfilter/nf_conntrack_helper.h> |
20 | #include <net/netfilter/nf_conntrack_expect.h> |
21 | |
22 | int nf_conntrack_broadcast_help(struct sk_buff *skb, |
23 | unsigned int protoff, |
24 | struct nf_conn *ct, |
25 | enum ip_conntrack_info ctinfo, |
26 | unsigned int timeout) |
27 | { |
28 | struct nf_conntrack_expect *exp; |
29 | struct iphdr *iph = ip_hdr(skb); |
30 | struct rtable *rt = skb_rtable(skb); |
31 | struct in_device *in_dev; |
32 | struct nf_conn_help *help = nfct_help(ct); |
33 | __be32 mask = 0; |
34 | |
35 | /* we're only interested in locally generated packets */ |
36 | if (skb->sk == NULL) |
37 | goto out; |
38 | if (rt == NULL || !(rt->rt_flags & RTCF_BROADCAST)) |
39 | goto out; |
40 | if (CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) |
41 | goto out; |
42 | |
43 | rcu_read_lock(); |
44 | in_dev = __in_dev_get_rcu(rt->dst.dev); |
45 | if (in_dev != NULL) { |
46 | for_primary_ifa(in_dev) { |
47 | if (ifa->ifa_broadcast == iph->daddr) { |
48 | mask = ifa->ifa_mask; |
49 | break; |
50 | } |
51 | } endfor_ifa(in_dev); |
52 | } |
53 | rcu_read_unlock(); |
54 | |
55 | if (mask == 0) |
56 | goto out; |
57 | |
58 | exp = nf_ct_expect_alloc(ct); |
59 | if (exp == NULL) |
60 | goto out; |
61 | |
62 | exp->tuple = ct->tuplehash[IP_CT_DIR_REPLY].tuple; |
63 | exp->tuple.src.u.udp.port = help->helper->tuple.src.u.udp.port; |
64 | |
65 | exp->mask.src.u3.ip = mask; |
66 | exp->mask.src.u.udp.port = htons(0xFFFF); |
67 | |
68 | exp->expectfn = NULL; |
69 | exp->flags = NF_CT_EXPECT_PERMANENT; |
70 | exp->class = NF_CT_EXPECT_CLASS_DEFAULT; |
71 | exp->helper = NULL; |
72 | |
73 | nf_ct_expect_related(exp); |
74 | nf_ct_expect_put(exp); |
75 | |
76 | nf_ct_refresh(ct, skb, timeout * HZ); |
77 | out: |
78 | return NF_ACCEPT; |
79 | } |
80 | EXPORT_SYMBOL_GPL(nf_conntrack_broadcast_help); |
81 | |
82 | MODULE_LICENSE("GPL"); |
83 |
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od-2011-09-18
v2.6.34-rc5
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