1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
|
/*
* net/sched/em_ipset.c ipset ematch
*
* Copyright (c) 2012 Florian Westphal <fw@strlen.de>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*/
#include <linux/gfp.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/skbuff.h>
#include <linux/netfilter/xt_set.h>
#include <linux/ipv6.h>
#include <net/ip.h>
#include <net/pkt_cls.h>
static int em_ipset_change(struct tcf_proto *tp, void *data, int data_len,
struct tcf_ematch *em)
{
struct xt_set_info *set = data;
ip_set_id_t index;
struct net *net = qdisc_dev(tp->q)->nd_net;
if (data_len != sizeof(*set))
return -EINVAL;
index = ip_set_nfnl_get_byindex(net, set->index);
if (index == IPSET_INVALID_ID)
return -ENOENT;
em->datalen = sizeof(*set);
em->data = (unsigned long)kmemdup(data, em->datalen, GFP_KERNEL);
if (em->data)
return 0;
ip_set_nfnl_put(net, index);
return -ENOMEM;
}
static void em_ipset_destroy(struct tcf_proto *p, struct tcf_ematch *em)
{
const struct xt_set_info *set = (const void *) em->data;
if (set) {
ip_set_nfnl_put(qdisc_dev(p->q)->nd_net, set->index);
kfree((void *) em->data);
}
}
static int em_ipset_match(struct sk_buff *skb, struct tcf_ematch *em,
struct tcf_pkt_info *info)
{
struct ip_set_adt_opt opt;
struct xt_action_param acpar;
const struct xt_set_info *set = (const void *) em->data;
struct net_device *dev, *indev = NULL;
int ret, network_offset;
switch (skb->protocol) {
case htons(ETH_P_IP):
acpar.family = NFPROTO_IPV4;
if (!pskb_network_may_pull(skb, sizeof(struct iphdr)))
return 0;
acpar.thoff = ip_hdrlen(skb);
break;
case htons(ETH_P_IPV6):
acpar.family = NFPROTO_IPV6;
if (!pskb_network_may_pull(skb, sizeof(struct ipv6hdr)))
return 0;
/* doesn't call ipv6_find_hdr() because ipset doesn't use thoff, yet */
acpar.thoff = sizeof(struct ipv6hdr);
break;
default:
return 0;
}
acpar.hooknum = 0;
opt.family = acpar.family;
opt.dim = set->dim;
opt.flags = set->flags;
opt.cmdflags = 0;
opt.ext.timeout = ~0u;
network_offset = skb_network_offset(skb);
skb_pull(skb, network_offset);
dev = skb->dev;
rcu_read_lock();
if (dev && skb->skb_iif)
indev = dev_get_by_index_rcu(dev_net(dev), skb->skb_iif);
acpar.in = indev ? indev : dev;
acpar.out = dev;
ret = ip_set_test(set->index, skb, &acpar, &opt);
rcu_read_unlock();
skb_push(skb, network_offset);
return ret;
}
static struct tcf_ematch_ops em_ipset_ops = {
.kind = TCF_EM_IPSET,
.change = em_ipset_change,
.destroy = em_ipset_destroy,
.match = em_ipset_match,
.owner = THIS_MODULE,
.link = LIST_HEAD_INIT(em_ipset_ops.link)
};
static int __init init_em_ipset(void)
{
return tcf_em_register(&em_ipset_ops);
}
static void __exit exit_em_ipset(void)
{
tcf_em_unregister(&em_ipset_ops);
}
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Florian Westphal <fw@strlen.de>");
MODULE_DESCRIPTION("TC extended match for IP sets");
module_init(init_em_ipset);
module_exit(exit_em_ipset);
MODULE_ALIAS_TCF_EMATCH(TCF_EM_IPSET);
|
