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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 | ||
ddf97ccd WC |
33 | static int connmark_net_id; |
34 | ||
22a5dc0e FF |
35 | static int tcf_connmark(struct sk_buff *skb, const struct tc_action *a, |
36 | struct tcf_result *res) | |
37 | { | |
38 | const struct nf_conntrack_tuple_hash *thash; | |
39 | struct nf_conntrack_tuple tuple; | |
40 | enum ip_conntrack_info ctinfo; | |
41 | struct tcf_connmark_info *ca = a->priv; | |
308ac914 | 42 | struct nf_conntrack_zone zone; |
22a5dc0e FF |
43 | struct nf_conn *c; |
44 | int proto; | |
45 | ||
46 | spin_lock(&ca->tcf_lock); | |
47 | ca->tcf_tm.lastuse = jiffies; | |
48 | bstats_update(&ca->tcf_bstats, skb); | |
49 | ||
50 | if (skb->protocol == htons(ETH_P_IP)) { | |
51 | if (skb->len < sizeof(struct iphdr)) | |
52 | goto out; | |
53 | ||
54 | proto = NFPROTO_IPV4; | |
55 | } else if (skb->protocol == htons(ETH_P_IPV6)) { | |
56 | if (skb->len < sizeof(struct ipv6hdr)) | |
57 | goto out; | |
58 | ||
59 | proto = NFPROTO_IPV6; | |
60 | } else { | |
61 | goto out; | |
62 | } | |
63 | ||
64 | c = nf_ct_get(skb, &ctinfo); | |
65 | if (c) { | |
66 | skb->mark = c->mark; | |
67 | /* using overlimits stats to count how many packets marked */ | |
68 | ca->tcf_qstats.overlimits++; | |
22a5dc0e FF |
69 | goto out; |
70 | } | |
71 | ||
72 | if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb), | |
a31f1adc | 73 | proto, ca->net, &tuple)) |
22a5dc0e FF |
74 | goto out; |
75 | ||
308ac914 | 76 | zone.id = ca->zone; |
deedb590 | 77 | zone.dir = NF_CT_DEFAULT_ZONE_DIR; |
308ac914 | 78 | |
a4ffe319 | 79 | thash = nf_conntrack_find_get(ca->net, &zone, &tuple); |
22a5dc0e FF |
80 | if (!thash) |
81 | goto out; | |
82 | ||
83 | c = nf_ct_tuplehash_to_ctrack(thash); | |
84 | /* using overlimits stats to count how many packets marked */ | |
85 | ca->tcf_qstats.overlimits++; | |
86 | skb->mark = c->mark; | |
87 | nf_ct_put(c); | |
88 | ||
89 | out: | |
22a5dc0e FF |
90 | spin_unlock(&ca->tcf_lock); |
91 | return ca->tcf_action; | |
92 | } | |
93 | ||
94 | static const struct nla_policy connmark_policy[TCA_CONNMARK_MAX + 1] = { | |
95 | [TCA_CONNMARK_PARMS] = { .len = sizeof(struct tc_connmark) }, | |
96 | }; | |
97 | ||
98 | static int tcf_connmark_init(struct net *net, struct nlattr *nla, | |
99 | struct nlattr *est, struct tc_action *a, | |
100 | int ovr, int bind) | |
101 | { | |
ddf97ccd | 102 | struct tc_action_net *tn = net_generic(net, connmark_net_id); |
22a5dc0e FF |
103 | struct nlattr *tb[TCA_CONNMARK_MAX + 1]; |
104 | struct tcf_connmark_info *ci; | |
105 | struct tc_connmark *parm; | |
106 | int ret = 0; | |
107 | ||
108 | if (!nla) | |
109 | return -EINVAL; | |
110 | ||
111 | ret = nla_parse_nested(tb, TCA_CONNMARK_MAX, nla, connmark_policy); | |
112 | if (ret < 0) | |
113 | return ret; | |
114 | ||
115 | parm = nla_data(tb[TCA_CONNMARK_PARMS]); | |
116 | ||
ddf97ccd WC |
117 | if (!tcf_hash_check(tn, parm->index, a, bind)) { |
118 | ret = tcf_hash_create(tn, parm->index, est, a, | |
119 | sizeof(*ci), bind, false); | |
22a5dc0e FF |
120 | if (ret) |
121 | return ret; | |
122 | ||
123 | ci = to_connmark(a); | |
124 | ci->tcf_action = parm->action; | |
a4ffe319 | 125 | ci->net = net; |
22a5dc0e FF |
126 | ci->zone = parm->zone; |
127 | ||
ddf97ccd | 128 | tcf_hash_insert(tn, a); |
22a5dc0e FF |
129 | ret = ACT_P_CREATED; |
130 | } else { | |
131 | ci = to_connmark(a); | |
132 | if (bind) | |
133 | return 0; | |
134 | tcf_hash_release(a, bind); | |
135 | if (!ovr) | |
136 | return -EEXIST; | |
137 | /* replacing action and zone */ | |
138 | ci->tcf_action = parm->action; | |
139 | ci->zone = parm->zone; | |
140 | } | |
141 | ||
142 | return ret; | |
143 | } | |
144 | ||
145 | static inline int tcf_connmark_dump(struct sk_buff *skb, struct tc_action *a, | |
146 | int bind, int ref) | |
147 | { | |
148 | unsigned char *b = skb_tail_pointer(skb); | |
149 | struct tcf_connmark_info *ci = a->priv; | |
150 | ||
151 | struct tc_connmark opt = { | |
152 | .index = ci->tcf_index, | |
153 | .refcnt = ci->tcf_refcnt - ref, | |
154 | .bindcnt = ci->tcf_bindcnt - bind, | |
155 | .action = ci->tcf_action, | |
156 | .zone = ci->zone, | |
157 | }; | |
158 | struct tcf_t t; | |
159 | ||
160 | if (nla_put(skb, TCA_CONNMARK_PARMS, sizeof(opt), &opt)) | |
161 | goto nla_put_failure; | |
162 | ||
163 | t.install = jiffies_to_clock_t(jiffies - ci->tcf_tm.install); | |
164 | t.lastuse = jiffies_to_clock_t(jiffies - ci->tcf_tm.lastuse); | |
165 | t.expires = jiffies_to_clock_t(ci->tcf_tm.expires); | |
9854518e ND |
166 | if (nla_put_64bit(skb, TCA_CONNMARK_TM, sizeof(t), &t, |
167 | TCA_CONNMARK_PAD)) | |
22a5dc0e FF |
168 | goto nla_put_failure; |
169 | ||
170 | return skb->len; | |
171 | nla_put_failure: | |
172 | nlmsg_trim(skb, b); | |
173 | return -1; | |
174 | } | |
175 | ||
ddf97ccd WC |
176 | static int tcf_connmark_walker(struct net *net, struct sk_buff *skb, |
177 | struct netlink_callback *cb, int type, | |
178 | struct tc_action *a) | |
179 | { | |
180 | struct tc_action_net *tn = net_generic(net, connmark_net_id); | |
181 | ||
182 | return tcf_generic_walker(tn, skb, cb, type, a); | |
183 | } | |
184 | ||
185 | static int tcf_connmark_search(struct net *net, struct tc_action *a, u32 index) | |
186 | { | |
187 | struct tc_action_net *tn = net_generic(net, connmark_net_id); | |
188 | ||
189 | return tcf_hash_search(tn, a, index); | |
190 | } | |
191 | ||
22a5dc0e FF |
192 | static struct tc_action_ops act_connmark_ops = { |
193 | .kind = "connmark", | |
194 | .type = TCA_ACT_CONNMARK, | |
195 | .owner = THIS_MODULE, | |
196 | .act = tcf_connmark, | |
197 | .dump = tcf_connmark_dump, | |
198 | .init = tcf_connmark_init, | |
ddf97ccd WC |
199 | .walk = tcf_connmark_walker, |
200 | .lookup = tcf_connmark_search, | |
201 | }; | |
202 | ||
203 | static __net_init int connmark_init_net(struct net *net) | |
204 | { | |
205 | struct tc_action_net *tn = net_generic(net, connmark_net_id); | |
206 | ||
207 | return tc_action_net_init(tn, &act_connmark_ops, CONNMARK_TAB_MASK); | |
208 | } | |
209 | ||
210 | static void __net_exit connmark_exit_net(struct net *net) | |
211 | { | |
212 | struct tc_action_net *tn = net_generic(net, connmark_net_id); | |
213 | ||
214 | tc_action_net_exit(tn); | |
215 | } | |
216 | ||
217 | static struct pernet_operations connmark_net_ops = { | |
218 | .init = connmark_init_net, | |
219 | .exit = connmark_exit_net, | |
220 | .id = &connmark_net_id, | |
221 | .size = sizeof(struct tc_action_net), | |
22a5dc0e FF |
222 | }; |
223 | ||
224 | static int __init connmark_init_module(void) | |
225 | { | |
ddf97ccd | 226 | return tcf_register_action(&act_connmark_ops, &connmark_net_ops); |
22a5dc0e FF |
227 | } |
228 | ||
229 | static void __exit connmark_cleanup_module(void) | |
230 | { | |
ddf97ccd | 231 | tcf_unregister_action(&act_connmark_ops, &connmark_net_ops); |
22a5dc0e FF |
232 | } |
233 | ||
234 | module_init(connmark_init_module); | |
235 | module_exit(connmark_cleanup_module); | |
236 | MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>"); | |
237 | MODULE_DESCRIPTION("Connection tracking mark restoring"); | |
238 | MODULE_LICENSE("GPL"); | |
239 |