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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 | 33 | static int connmark_net_id; |
a85a970a | 34 | static struct tc_action_ops act_connmark_ops; |
ddf97ccd | 35 | |
22a5dc0e FF |
36 | static int tcf_connmark(struct sk_buff *skb, const struct tc_action *a, |
37 | struct tcf_result *res) | |
38 | { | |
39 | const struct nf_conntrack_tuple_hash *thash; | |
40 | struct nf_conntrack_tuple tuple; | |
41 | enum ip_conntrack_info ctinfo; | |
a85a970a | 42 | struct tcf_connmark_info *ca = to_connmark(a); |
308ac914 | 43 | struct nf_conntrack_zone zone; |
22a5dc0e FF |
44 | struct nf_conn *c; |
45 | int proto; | |
46 | ||
47 | spin_lock(&ca->tcf_lock); | |
9c4a4e48 | 48 | tcf_lastuse_update(&ca->tcf_tm); |
22a5dc0e FF |
49 | bstats_update(&ca->tcf_bstats, skb); |
50 | ||
51 | if (skb->protocol == htons(ETH_P_IP)) { | |
52 | if (skb->len < sizeof(struct iphdr)) | |
53 | goto out; | |
54 | ||
55 | proto = NFPROTO_IPV4; | |
56 | } else if (skb->protocol == htons(ETH_P_IPV6)) { | |
57 | if (skb->len < sizeof(struct ipv6hdr)) | |
58 | goto out; | |
59 | ||
60 | proto = NFPROTO_IPV6; | |
61 | } else { | |
62 | goto out; | |
63 | } | |
64 | ||
65 | c = nf_ct_get(skb, &ctinfo); | |
66 | if (c) { | |
67 | skb->mark = c->mark; | |
68 | /* using overlimits stats to count how many packets marked */ | |
69 | ca->tcf_qstats.overlimits++; | |
22a5dc0e FF |
70 | goto out; |
71 | } | |
72 | ||
73 | if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb), | |
a31f1adc | 74 | proto, ca->net, &tuple)) |
22a5dc0e FF |
75 | goto out; |
76 | ||
308ac914 | 77 | zone.id = ca->zone; |
deedb590 | 78 | zone.dir = NF_CT_DEFAULT_ZONE_DIR; |
308ac914 | 79 | |
a4ffe319 | 80 | thash = nf_conntrack_find_get(ca->net, &zone, &tuple); |
22a5dc0e FF |
81 | if (!thash) |
82 | goto out; | |
83 | ||
84 | c = nf_ct_tuplehash_to_ctrack(thash); | |
85 | /* using overlimits stats to count how many packets marked */ | |
86 | ca->tcf_qstats.overlimits++; | |
87 | skb->mark = c->mark; | |
88 | nf_ct_put(c); | |
89 | ||
90 | out: | |
22a5dc0e FF |
91 | spin_unlock(&ca->tcf_lock); |
92 | return ca->tcf_action; | |
93 | } | |
94 | ||
95 | static const struct nla_policy connmark_policy[TCA_CONNMARK_MAX + 1] = { | |
96 | [TCA_CONNMARK_PARMS] = { .len = sizeof(struct tc_connmark) }, | |
97 | }; | |
98 | ||
99 | static int tcf_connmark_init(struct net *net, struct nlattr *nla, | |
a85a970a | 100 | struct nlattr *est, struct tc_action **a, |
22a5dc0e FF |
101 | int ovr, int bind) |
102 | { | |
ddf97ccd | 103 | struct tc_action_net *tn = net_generic(net, connmark_net_id); |
22a5dc0e FF |
104 | struct nlattr *tb[TCA_CONNMARK_MAX + 1]; |
105 | struct tcf_connmark_info *ci; | |
106 | struct tc_connmark *parm; | |
107 | int ret = 0; | |
108 | ||
109 | if (!nla) | |
110 | return -EINVAL; | |
111 | ||
112 | ret = nla_parse_nested(tb, TCA_CONNMARK_MAX, nla, connmark_policy); | |
113 | if (ret < 0) | |
114 | return ret; | |
115 | ||
116 | parm = nla_data(tb[TCA_CONNMARK_PARMS]); | |
117 | ||
ddf97ccd WC |
118 | if (!tcf_hash_check(tn, parm->index, a, bind)) { |
119 | ret = tcf_hash_create(tn, parm->index, est, a, | |
a85a970a | 120 | &act_connmark_ops, bind, false); |
22a5dc0e FF |
121 | if (ret) |
122 | return ret; | |
123 | ||
a85a970a | 124 | ci = to_connmark(*a); |
22a5dc0e | 125 | ci->tcf_action = parm->action; |
a4ffe319 | 126 | ci->net = net; |
22a5dc0e FF |
127 | ci->zone = parm->zone; |
128 | ||
a85a970a | 129 | tcf_hash_insert(tn, *a); |
22a5dc0e FF |
130 | ret = ACT_P_CREATED; |
131 | } else { | |
a85a970a | 132 | ci = to_connmark(*a); |
22a5dc0e FF |
133 | if (bind) |
134 | return 0; | |
a85a970a | 135 | tcf_hash_release(*a, bind); |
22a5dc0e FF |
136 | if (!ovr) |
137 | return -EEXIST; | |
138 | /* replacing action and zone */ | |
139 | ci->tcf_action = parm->action; | |
140 | ci->zone = parm->zone; | |
141 | } | |
142 | ||
143 | return ret; | |
144 | } | |
145 | ||
146 | static inline int tcf_connmark_dump(struct sk_buff *skb, struct tc_action *a, | |
147 | int bind, int ref) | |
148 | { | |
149 | unsigned char *b = skb_tail_pointer(skb); | |
a85a970a | 150 | struct tcf_connmark_info *ci = to_connmark(a); |
22a5dc0e FF |
151 | |
152 | struct tc_connmark opt = { | |
153 | .index = ci->tcf_index, | |
154 | .refcnt = ci->tcf_refcnt - ref, | |
155 | .bindcnt = ci->tcf_bindcnt - bind, | |
156 | .action = ci->tcf_action, | |
157 | .zone = ci->zone, | |
158 | }; | |
159 | struct tcf_t t; | |
160 | ||
161 | if (nla_put(skb, TCA_CONNMARK_PARMS, sizeof(opt), &opt)) | |
162 | goto nla_put_failure; | |
163 | ||
48d8ee16 | 164 | tcf_tm_dump(&t, &ci->tcf_tm); |
9854518e ND |
165 | if (nla_put_64bit(skb, TCA_CONNMARK_TM, sizeof(t), &t, |
166 | TCA_CONNMARK_PAD)) | |
22a5dc0e FF |
167 | goto nla_put_failure; |
168 | ||
169 | return skb->len; | |
170 | nla_put_failure: | |
171 | nlmsg_trim(skb, b); | |
172 | return -1; | |
173 | } | |
174 | ||
ddf97ccd WC |
175 | static int tcf_connmark_walker(struct net *net, struct sk_buff *skb, |
176 | struct netlink_callback *cb, int type, | |
a85a970a | 177 | const struct tc_action_ops *ops) |
ddf97ccd WC |
178 | { |
179 | struct tc_action_net *tn = net_generic(net, connmark_net_id); | |
180 | ||
a85a970a | 181 | return tcf_generic_walker(tn, skb, cb, type, ops); |
ddf97ccd WC |
182 | } |
183 | ||
a85a970a | 184 | static int tcf_connmark_search(struct net *net, struct tc_action **a, u32 index) |
ddf97ccd WC |
185 | { |
186 | struct tc_action_net *tn = net_generic(net, connmark_net_id); | |
187 | ||
188 | return tcf_hash_search(tn, a, index); | |
189 | } | |
190 | ||
22a5dc0e FF |
191 | static struct tc_action_ops act_connmark_ops = { |
192 | .kind = "connmark", | |
193 | .type = TCA_ACT_CONNMARK, | |
194 | .owner = THIS_MODULE, | |
195 | .act = tcf_connmark, | |
196 | .dump = tcf_connmark_dump, | |
197 | .init = tcf_connmark_init, | |
ddf97ccd WC |
198 | .walk = tcf_connmark_walker, |
199 | .lookup = tcf_connmark_search, | |
a85a970a | 200 | .size = sizeof(struct tcf_connmark_info), |
ddf97ccd WC |
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 |