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1 | /* |
2 | * net/sched/em_ipset.c ipset ematch |
3 | * |
4 | * Copyright (c) 2012 Florian Westphal <fw@strlen.de> |
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 | * version 2 as published by the Free Software Foundation. |
9 | */ |
10 | |
11 | #include <linux/gfp.h> |
12 | #include <linux/module.h> |
13 | #include <linux/types.h> |
14 | #include <linux/kernel.h> |
15 | #include <linux/string.h> |
16 | #include <linux/skbuff.h> |
17 | #include <linux/netfilter/xt_set.h> |
18 | #include <linux/ipv6.h> |
19 | #include <net/ip.h> |
20 | #include <net/pkt_cls.h> |
21 | |
22 | static int em_ipset_change(struct tcf_proto *tp, void *data, int data_len, |
23 | struct tcf_ematch *em) |
24 | { |
25 | struct xt_set_info *set = data; |
26 | ip_set_id_t index; |
27 | |
28 | if (data_len != sizeof(*set)) |
29 | return -EINVAL; |
30 | |
31 | index = ip_set_nfnl_get_byindex(set->index); |
32 | if (index == IPSET_INVALID_ID) |
33 | return -ENOENT; |
34 | |
35 | em->datalen = sizeof(*set); |
36 | em->data = (unsigned long)kmemdup(data, em->datalen, GFP_KERNEL); |
37 | if (em->data) |
38 | return 0; |
39 | |
40 | ip_set_nfnl_put(index); |
41 | return -ENOMEM; |
42 | } |
43 | |
44 | static void em_ipset_destroy(struct tcf_proto *p, struct tcf_ematch *em) |
45 | { |
46 | const struct xt_set_info *set = (const void *) em->data; |
47 | if (set) { |
48 | ip_set_nfnl_put(set->index); |
49 | kfree((void *) em->data); |
50 | } |
51 | } |
52 | |
53 | static int em_ipset_match(struct sk_buff *skb, struct tcf_ematch *em, |
54 | struct tcf_pkt_info *info) |
55 | { |
56 | struct ip_set_adt_opt opt; |
57 | struct xt_action_param acpar; |
58 | const struct xt_set_info *set = (const void *) em->data; |
59 | struct net_device *dev, *indev = NULL; |
60 | int ret, network_offset; |
61 | |
62 | switch (skb->protocol) { |
63 | case htons(ETH_P_IP): |
64 | acpar.family = NFPROTO_IPV4; |
65 | if (!pskb_network_may_pull(skb, sizeof(struct iphdr))) |
66 | return 0; |
67 | acpar.thoff = ip_hdrlen(skb); |
68 | break; |
69 | case htons(ETH_P_IPV6): |
70 | acpar.family = NFPROTO_IPV6; |
71 | if (!pskb_network_may_pull(skb, sizeof(struct ipv6hdr))) |
72 | return 0; |
73 | /* doesn't call ipv6_find_hdr() because ipset doesn't use thoff, yet */ |
74 | acpar.thoff = sizeof(struct ipv6hdr); |
75 | break; |
76 | default: |
77 | return 0; |
78 | } |
79 | |
80 | acpar.hooknum = 0; |
81 | |
82 | opt.family = acpar.family; |
83 | opt.dim = set->dim; |
84 | opt.flags = set->flags; |
85 | opt.cmdflags = 0; |
86 | opt.timeout = ~0u; |
87 | |
88 | network_offset = skb_network_offset(skb); |
89 | skb_pull(skb, network_offset); |
90 | |
91 | dev = skb->dev; |
92 | |
93 | rcu_read_lock(); |
94 | |
95 | if (dev && skb->skb_iif) |
96 | indev = dev_get_by_index_rcu(dev_net(dev), skb->skb_iif); |
97 | |
98 | acpar.in = indev ? indev : dev; |
99 | acpar.out = dev; |
100 | |
101 | ret = ip_set_test(set->index, skb, &acpar, &opt); |
102 | |
103 | rcu_read_unlock(); |
104 | |
105 | skb_push(skb, network_offset); |
106 | return ret; |
107 | } |
108 | |
109 | static struct tcf_ematch_ops em_ipset_ops = { |
110 | .kind = TCF_EM_IPSET, |
111 | .change = em_ipset_change, |
112 | .destroy = em_ipset_destroy, |
113 | .match = em_ipset_match, |
114 | .owner = THIS_MODULE, |
115 | .link = LIST_HEAD_INIT(em_ipset_ops.link) |
116 | }; |
117 | |
118 | static int __init init_em_ipset(void) |
119 | { |
120 | return tcf_em_register(&em_ipset_ops); |
121 | } |
122 | |
123 | static void __exit exit_em_ipset(void) |
124 | { |
125 | tcf_em_unregister(&em_ipset_ops); |
126 | } |
127 | |
128 | MODULE_LICENSE("GPL"); |
129 | MODULE_AUTHOR("Florian Westphal <fw@strlen.de>"); |
130 | MODULE_DESCRIPTION("TC extended match for IP sets"); |
131 | |
132 | module_init(init_em_ipset); |
133 | module_exit(exit_em_ipset); |
134 | |
135 | MODULE_ALIAS_TCF_EMATCH(TCF_EM_IPSET); |
136 |
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