blob: 1ac41d3de5c36d4c32cf27806172b6ea884980de [file] [log] [blame]
Florian Westphal6d4fa852012-07-11 10:56:57 +00001/*
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
22static 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;
Vitaly Lavrov1785e8f2013-09-30 17:07:02 +020027 struct net *net = qdisc_dev(tp->q)->nd_net;
Florian Westphal6d4fa852012-07-11 10:56:57 +000028
29 if (data_len != sizeof(*set))
30 return -EINVAL;
31
Vitaly Lavrov1785e8f2013-09-30 17:07:02 +020032 index = ip_set_nfnl_get_byindex(net, set->index);
Florian Westphal6d4fa852012-07-11 10:56:57 +000033 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
Vitaly Lavrov1785e8f2013-09-30 17:07:02 +020041 ip_set_nfnl_put(net, index);
Florian Westphal6d4fa852012-07-11 10:56:57 +000042 return -ENOMEM;
43}
44
45static 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) {
Vitaly Lavrov1785e8f2013-09-30 17:07:02 +020049 ip_set_nfnl_put(qdisc_dev(p->q)->nd_net, set->index);
Florian Westphal6d4fa852012-07-11 10:56:57 +000050 kfree((void *) em->data);
51 }
52}
53
54static 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;
Jozsef Kadlecsik075e64c2013-04-27 14:28:55 +020087 opt.ext.timeout = ~0u;
Florian Westphal6d4fa852012-07-11 10:56:57 +000088
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
110static 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
119static int __init init_em_ipset(void)
120{
121 return tcf_em_register(&em_ipset_ops);
122}
123
124static void __exit exit_em_ipset(void)
125{
126 tcf_em_unregister(&em_ipset_ops);
127}
128
129MODULE_LICENSE("GPL");
130MODULE_AUTHOR("Florian Westphal <fw@strlen.de>");
131MODULE_DESCRIPTION("TC extended match for IP sets");
132
133module_init(init_em_ipset);
134module_exit(exit_em_ipset);
135
136MODULE_ALIAS_TCF_EMATCH(TCF_EM_IPSET);