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1 | /* |
2 | * net/sched/act_connmark.c netfilter connmark retriever action | |
3 | * skb mark is over-written | |
4 | * | |
5 | * Copyright (c) 2011 Felix Fietkau <nbd@openwrt.org> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | */ | |
12 | ||
13 | #include <linux/module.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/skbuff.h> | |
17 | #include <linux/rtnetlink.h> | |
18 | #include <linux/pkt_cls.h> | |
19 | #include <linux/ip.h> | |
20 | #include <linux/ipv6.h> | |
21 | #include <net/netlink.h> | |
22 | #include <net/pkt_sched.h> | |
23 | #include <net/act_api.h> | |
24 | #include <uapi/linux/tc_act/tc_connmark.h> | |
25 | #include <net/tc_act/tc_connmark.h> | |
26 | ||
27 | #include <net/netfilter/nf_conntrack.h> | |
28 | #include <net/netfilter/nf_conntrack_core.h> | |
29 | #include <net/netfilter/nf_conntrack_zones.h> | |
30 | ||
31 | #define CONNMARK_TAB_MASK 3 | |
32 | ||
33 | static int tcf_connmark(struct sk_buff *skb, const struct tc_action *a, | |
34 | struct tcf_result *res) | |
35 | { | |
36 | const struct nf_conntrack_tuple_hash *thash; | |
37 | struct nf_conntrack_tuple tuple; | |
38 | enum ip_conntrack_info ctinfo; | |
39 | struct tcf_connmark_info *ca = a->priv; | |
40 | struct nf_conn *c; | |
41 | int proto; | |
42 | ||
43 | spin_lock(&ca->tcf_lock); | |
44 | ca->tcf_tm.lastuse = jiffies; | |
45 | bstats_update(&ca->tcf_bstats, skb); | |
46 | ||
47 | if (skb->protocol == htons(ETH_P_IP)) { | |
48 | if (skb->len < sizeof(struct iphdr)) | |
49 | goto out; | |
50 | ||
51 | proto = NFPROTO_IPV4; | |
52 | } else if (skb->protocol == htons(ETH_P_IPV6)) { | |
53 | if (skb->len < sizeof(struct ipv6hdr)) | |
54 | goto out; | |
55 | ||
56 | proto = NFPROTO_IPV6; | |
57 | } else { | |
58 | goto out; | |
59 | } | |
60 | ||
61 | c = nf_ct_get(skb, &ctinfo); | |
62 | if (c) { | |
63 | skb->mark = c->mark; | |
64 | /* using overlimits stats to count how many packets marked */ | |
65 | ca->tcf_qstats.overlimits++; | |
22a5dc0e FF |
66 | goto out; |
67 | } | |
68 | ||
69 | if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb), | |
70 | proto, &tuple)) | |
71 | goto out; | |
72 | ||
73 | thash = nf_conntrack_find_get(dev_net(skb->dev), ca->zone, &tuple); | |
74 | if (!thash) | |
75 | goto out; | |
76 | ||
77 | c = nf_ct_tuplehash_to_ctrack(thash); | |
78 | /* using overlimits stats to count how many packets marked */ | |
79 | ca->tcf_qstats.overlimits++; | |
80 | skb->mark = c->mark; | |
81 | nf_ct_put(c); | |
82 | ||
83 | out: | |
22a5dc0e FF |
84 | spin_unlock(&ca->tcf_lock); |
85 | return ca->tcf_action; | |
86 | } | |
87 | ||
88 | static const struct nla_policy connmark_policy[TCA_CONNMARK_MAX + 1] = { | |
89 | [TCA_CONNMARK_PARMS] = { .len = sizeof(struct tc_connmark) }, | |
90 | }; | |
91 | ||
92 | static int tcf_connmark_init(struct net *net, struct nlattr *nla, | |
93 | struct nlattr *est, struct tc_action *a, | |
94 | int ovr, int bind) | |
95 | { | |
96 | struct nlattr *tb[TCA_CONNMARK_MAX + 1]; | |
97 | struct tcf_connmark_info *ci; | |
98 | struct tc_connmark *parm; | |
99 | int ret = 0; | |
100 | ||
101 | if (!nla) | |
102 | return -EINVAL; | |
103 | ||
104 | ret = nla_parse_nested(tb, TCA_CONNMARK_MAX, nla, connmark_policy); | |
105 | if (ret < 0) | |
106 | return ret; | |
107 | ||
108 | parm = nla_data(tb[TCA_CONNMARK_PARMS]); | |
109 | ||
110 | if (!tcf_hash_check(parm->index, a, bind)) { | |
111 | ret = tcf_hash_create(parm->index, est, a, sizeof(*ci), bind); | |
112 | if (ret) | |
113 | return ret; | |
114 | ||
115 | ci = to_connmark(a); | |
116 | ci->tcf_action = parm->action; | |
117 | ci->zone = parm->zone; | |
118 | ||
119 | tcf_hash_insert(a); | |
120 | ret = ACT_P_CREATED; | |
121 | } else { | |
122 | ci = to_connmark(a); | |
123 | if (bind) | |
124 | return 0; | |
125 | tcf_hash_release(a, bind); | |
126 | if (!ovr) | |
127 | return -EEXIST; | |
128 | /* replacing action and zone */ | |
129 | ci->tcf_action = parm->action; | |
130 | ci->zone = parm->zone; | |
131 | } | |
132 | ||
133 | return ret; | |
134 | } | |
135 | ||
136 | static inline int tcf_connmark_dump(struct sk_buff *skb, struct tc_action *a, | |
137 | int bind, int ref) | |
138 | { | |
139 | unsigned char *b = skb_tail_pointer(skb); | |
140 | struct tcf_connmark_info *ci = a->priv; | |
141 | ||
142 | struct tc_connmark opt = { | |
143 | .index = ci->tcf_index, | |
144 | .refcnt = ci->tcf_refcnt - ref, | |
145 | .bindcnt = ci->tcf_bindcnt - bind, | |
146 | .action = ci->tcf_action, | |
147 | .zone = ci->zone, | |
148 | }; | |
149 | struct tcf_t t; | |
150 | ||
151 | if (nla_put(skb, TCA_CONNMARK_PARMS, sizeof(opt), &opt)) | |
152 | goto nla_put_failure; | |
153 | ||
154 | t.install = jiffies_to_clock_t(jiffies - ci->tcf_tm.install); | |
155 | t.lastuse = jiffies_to_clock_t(jiffies - ci->tcf_tm.lastuse); | |
156 | t.expires = jiffies_to_clock_t(ci->tcf_tm.expires); | |
157 | if (nla_put(skb, TCA_CONNMARK_TM, sizeof(t), &t)) | |
158 | goto nla_put_failure; | |
159 | ||
160 | return skb->len; | |
161 | nla_put_failure: | |
162 | nlmsg_trim(skb, b); | |
163 | return -1; | |
164 | } | |
165 | ||
166 | static struct tc_action_ops act_connmark_ops = { | |
167 | .kind = "connmark", | |
168 | .type = TCA_ACT_CONNMARK, | |
169 | .owner = THIS_MODULE, | |
170 | .act = tcf_connmark, | |
171 | .dump = tcf_connmark_dump, | |
172 | .init = tcf_connmark_init, | |
173 | }; | |
174 | ||
175 | static int __init connmark_init_module(void) | |
176 | { | |
177 | return tcf_register_action(&act_connmark_ops, CONNMARK_TAB_MASK); | |
178 | } | |
179 | ||
180 | static void __exit connmark_cleanup_module(void) | |
181 | { | |
182 | tcf_unregister_action(&act_connmark_ops); | |
183 | } | |
184 | ||
185 | module_init(connmark_init_module); | |
186 | module_exit(connmark_cleanup_module); | |
187 | MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>"); | |
188 | MODULE_DESCRIPTION("Connection tracking mark restoring"); | |
189 | MODULE_LICENSE("GPL"); | |
190 |