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6d4fa852 FW |
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; | |
b1eda2ac | 27 | struct net *net = dev_net(qdisc_dev(tp->q)); |
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28 | |
29 | if (data_len != sizeof(*set)) | |
30 | return -EINVAL; | |
31 | ||
1785e8f4 | 32 | index = ip_set_nfnl_get_byindex(net, set->index); |
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33 | if (index == IPSET_INVALID_ID) |
34 | return -ENOENT; | |
35 | ||
36 | em->datalen = sizeof(*set); | |
37 | em->data = (unsigned long)kmemdup(data, em->datalen, GFP_KERNEL); | |
38 | if (em->data) | |
39 | return 0; | |
40 | ||
1785e8f4 | 41 | ip_set_nfnl_put(net, index); |
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42 | return -ENOMEM; |
43 | } | |
44 | ||
45 | static void em_ipset_destroy(struct tcf_proto *p, struct tcf_ematch *em) | |
46 | { | |
47 | const struct xt_set_info *set = (const void *) em->data; | |
48 | if (set) { | |
b1eda2ac | 49 | ip_set_nfnl_put(dev_net(qdisc_dev(p->q)), set->index); |
6d4fa852 FW |
50 | kfree((void *) em->data); |
51 | } | |
52 | } | |
53 | ||
54 | static int em_ipset_match(struct sk_buff *skb, struct tcf_ematch *em, | |
55 | struct tcf_pkt_info *info) | |
56 | { | |
57 | struct ip_set_adt_opt opt; | |
58 | struct xt_action_param acpar; | |
59 | const struct xt_set_info *set = (const void *) em->data; | |
60 | struct net_device *dev, *indev = NULL; | |
61 | int ret, network_offset; | |
62 | ||
63 | switch (skb->protocol) { | |
64 | case htons(ETH_P_IP): | |
65 | acpar.family = NFPROTO_IPV4; | |
66 | if (!pskb_network_may_pull(skb, sizeof(struct iphdr))) | |
67 | return 0; | |
68 | acpar.thoff = ip_hdrlen(skb); | |
69 | break; | |
70 | case htons(ETH_P_IPV6): | |
71 | acpar.family = NFPROTO_IPV6; | |
72 | if (!pskb_network_may_pull(skb, sizeof(struct ipv6hdr))) | |
73 | return 0; | |
74 | /* doesn't call ipv6_find_hdr() because ipset doesn't use thoff, yet */ | |
75 | acpar.thoff = sizeof(struct ipv6hdr); | |
76 | break; | |
77 | default: | |
78 | return 0; | |
79 | } | |
80 | ||
81 | acpar.hooknum = 0; | |
82 | ||
83 | opt.family = acpar.family; | |
84 | opt.dim = set->dim; | |
85 | opt.flags = set->flags; | |
86 | opt.cmdflags = 0; | |
075e64c0 | 87 | opt.ext.timeout = ~0u; |
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88 | |
89 | network_offset = skb_network_offset(skb); | |
90 | skb_pull(skb, network_offset); | |
91 | ||
92 | dev = skb->dev; | |
93 | ||
94 | rcu_read_lock(); | |
95 | ||
96 | if (dev && skb->skb_iif) | |
97 | indev = dev_get_by_index_rcu(dev_net(dev), skb->skb_iif); | |
98 | ||
99 | acpar.in = indev ? indev : dev; | |
100 | acpar.out = dev; | |
101 | ||
102 | ret = ip_set_test(set->index, skb, &acpar, &opt); | |
103 | ||
104 | rcu_read_unlock(); | |
105 | ||
106 | skb_push(skb, network_offset); | |
107 | return ret; | |
108 | } | |
109 | ||
110 | static struct tcf_ematch_ops em_ipset_ops = { | |
111 | .kind = TCF_EM_IPSET, | |
112 | .change = em_ipset_change, | |
113 | .destroy = em_ipset_destroy, | |
114 | .match = em_ipset_match, | |
115 | .owner = THIS_MODULE, | |
116 | .link = LIST_HEAD_INIT(em_ipset_ops.link) | |
117 | }; | |
118 | ||
119 | static int __init init_em_ipset(void) | |
120 | { | |
121 | return tcf_em_register(&em_ipset_ops); | |
122 | } | |
123 | ||
124 | static void __exit exit_em_ipset(void) | |
125 | { | |
126 | tcf_em_unregister(&em_ipset_ops); | |
127 | } | |
128 | ||
129 | MODULE_LICENSE("GPL"); | |
130 | MODULE_AUTHOR("Florian Westphal <fw@strlen.de>"); | |
131 | MODULE_DESCRIPTION("TC extended match for IP sets"); | |
132 | ||
133 | module_init(init_em_ipset); | |
134 | module_exit(exit_em_ipset); | |
135 | ||
136 | MODULE_ALIAS_TCF_EMATCH(TCF_EM_IPSET); |