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22a5dc0e FF |
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; | |
308ac914 | 40 | struct nf_conntrack_zone zone; |
22a5dc0e FF |
41 | struct nf_conn *c; |
42 | int proto; | |
43 | ||
44 | spin_lock(&ca->tcf_lock); | |
45 | ca->tcf_tm.lastuse = jiffies; | |
46 | bstats_update(&ca->tcf_bstats, skb); | |
47 | ||
48 | if (skb->protocol == htons(ETH_P_IP)) { | |
49 | if (skb->len < sizeof(struct iphdr)) | |
50 | goto out; | |
51 | ||
52 | proto = NFPROTO_IPV4; | |
53 | } else if (skb->protocol == htons(ETH_P_IPV6)) { | |
54 | if (skb->len < sizeof(struct ipv6hdr)) | |
55 | goto out; | |
56 | ||
57 | proto = NFPROTO_IPV6; | |
58 | } else { | |
59 | goto out; | |
60 | } | |
61 | ||
62 | c = nf_ct_get(skb, &ctinfo); | |
63 | if (c) { | |
64 | skb->mark = c->mark; | |
65 | /* using overlimits stats to count how many packets marked */ | |
66 | ca->tcf_qstats.overlimits++; | |
22a5dc0e FF |
67 | goto out; |
68 | } | |
69 | ||
70 | if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb), | |
71 | proto, &tuple)) | |
72 | goto out; | |
73 | ||
308ac914 | 74 | zone.id = ca->zone; |
deedb590 | 75 | zone.dir = NF_CT_DEFAULT_ZONE_DIR; |
308ac914 DB |
76 | |
77 | thash = nf_conntrack_find_get(dev_net(skb->dev), &zone, &tuple); | |
22a5dc0e FF |
78 | if (!thash) |
79 | goto out; | |
80 | ||
81 | c = nf_ct_tuplehash_to_ctrack(thash); | |
82 | /* using overlimits stats to count how many packets marked */ | |
83 | ca->tcf_qstats.overlimits++; | |
84 | skb->mark = c->mark; | |
85 | nf_ct_put(c); | |
86 | ||
87 | out: | |
22a5dc0e FF |
88 | spin_unlock(&ca->tcf_lock); |
89 | return ca->tcf_action; | |
90 | } | |
91 | ||
92 | static const struct nla_policy connmark_policy[TCA_CONNMARK_MAX + 1] = { | |
93 | [TCA_CONNMARK_PARMS] = { .len = sizeof(struct tc_connmark) }, | |
94 | }; | |
95 | ||
96 | static int tcf_connmark_init(struct net *net, struct nlattr *nla, | |
97 | struct nlattr *est, struct tc_action *a, | |
98 | int ovr, int bind) | |
99 | { | |
100 | struct nlattr *tb[TCA_CONNMARK_MAX + 1]; | |
101 | struct tcf_connmark_info *ci; | |
102 | struct tc_connmark *parm; | |
103 | int ret = 0; | |
104 | ||
105 | if (!nla) | |
106 | return -EINVAL; | |
107 | ||
108 | ret = nla_parse_nested(tb, TCA_CONNMARK_MAX, nla, connmark_policy); | |
109 | if (ret < 0) | |
110 | return ret; | |
111 | ||
112 | parm = nla_data(tb[TCA_CONNMARK_PARMS]); | |
113 | ||
114 | if (!tcf_hash_check(parm->index, a, bind)) { | |
519c818e ED |
115 | ret = tcf_hash_create(parm->index, est, a, sizeof(*ci), |
116 | bind, false); | |
22a5dc0e FF |
117 | if (ret) |
118 | return ret; | |
119 | ||
120 | ci = to_connmark(a); | |
121 | ci->tcf_action = parm->action; | |
122 | ci->zone = parm->zone; | |
123 | ||
124 | tcf_hash_insert(a); | |
125 | ret = ACT_P_CREATED; | |
126 | } else { | |
127 | ci = to_connmark(a); | |
128 | if (bind) | |
129 | return 0; | |
130 | tcf_hash_release(a, bind); | |
131 | if (!ovr) | |
132 | return -EEXIST; | |
133 | /* replacing action and zone */ | |
134 | ci->tcf_action = parm->action; | |
135 | ci->zone = parm->zone; | |
136 | } | |
137 | ||
138 | return ret; | |
139 | } | |
140 | ||
141 | static inline int tcf_connmark_dump(struct sk_buff *skb, struct tc_action *a, | |
142 | int bind, int ref) | |
143 | { | |
144 | unsigned char *b = skb_tail_pointer(skb); | |
145 | struct tcf_connmark_info *ci = a->priv; | |
146 | ||
147 | struct tc_connmark opt = { | |
148 | .index = ci->tcf_index, | |
149 | .refcnt = ci->tcf_refcnt - ref, | |
150 | .bindcnt = ci->tcf_bindcnt - bind, | |
151 | .action = ci->tcf_action, | |
152 | .zone = ci->zone, | |
153 | }; | |
154 | struct tcf_t t; | |
155 | ||
156 | if (nla_put(skb, TCA_CONNMARK_PARMS, sizeof(opt), &opt)) | |
157 | goto nla_put_failure; | |
158 | ||
159 | t.install = jiffies_to_clock_t(jiffies - ci->tcf_tm.install); | |
160 | t.lastuse = jiffies_to_clock_t(jiffies - ci->tcf_tm.lastuse); | |
161 | t.expires = jiffies_to_clock_t(ci->tcf_tm.expires); | |
162 | if (nla_put(skb, TCA_CONNMARK_TM, sizeof(t), &t)) | |
163 | goto nla_put_failure; | |
164 | ||
165 | return skb->len; | |
166 | nla_put_failure: | |
167 | nlmsg_trim(skb, b); | |
168 | return -1; | |
169 | } | |
170 | ||
171 | static struct tc_action_ops act_connmark_ops = { | |
172 | .kind = "connmark", | |
173 | .type = TCA_ACT_CONNMARK, | |
174 | .owner = THIS_MODULE, | |
175 | .act = tcf_connmark, | |
176 | .dump = tcf_connmark_dump, | |
177 | .init = tcf_connmark_init, | |
178 | }; | |
179 | ||
180 | static int __init connmark_init_module(void) | |
181 | { | |
182 | return tcf_register_action(&act_connmark_ops, CONNMARK_TAB_MASK); | |
183 | } | |
184 | ||
185 | static void __exit connmark_cleanup_module(void) | |
186 | { | |
187 | tcf_unregister_action(&act_connmark_ops); | |
188 | } | |
189 | ||
190 | module_init(connmark_init_module); | |
191 | module_exit(connmark_cleanup_module); | |
192 | MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>"); | |
193 | MODULE_DESCRIPTION("Connection tracking mark restoring"); | |
194 | MODULE_LICENSE("GPL"); | |
195 |