]>
Commit | Line | Data |
---|---|---|
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 | ||
c7d03a00 | 31 | static unsigned int connmark_net_id; |
a85a970a | 32 | static struct tc_action_ops act_connmark_ops; |
ddf97ccd | 33 | |
22a5dc0e FF |
34 | static int tcf_connmark(struct sk_buff *skb, const struct tc_action *a, |
35 | struct tcf_result *res) | |
36 | { | |
37 | const struct nf_conntrack_tuple_hash *thash; | |
38 | struct nf_conntrack_tuple tuple; | |
39 | enum ip_conntrack_info ctinfo; | |
a85a970a | 40 | struct tcf_connmark_info *ca = to_connmark(a); |
308ac914 | 41 | struct nf_conntrack_zone zone; |
22a5dc0e FF |
42 | struct nf_conn *c; |
43 | int proto; | |
44 | ||
45 | spin_lock(&ca->tcf_lock); | |
9c4a4e48 | 46 | tcf_lastuse_update(&ca->tcf_tm); |
22a5dc0e FF |
47 | bstats_update(&ca->tcf_bstats, skb); |
48 | ||
49 | if (skb->protocol == htons(ETH_P_IP)) { | |
50 | if (skb->len < sizeof(struct iphdr)) | |
51 | goto out; | |
52 | ||
53 | proto = NFPROTO_IPV4; | |
54 | } else if (skb->protocol == htons(ETH_P_IPV6)) { | |
55 | if (skb->len < sizeof(struct ipv6hdr)) | |
56 | goto out; | |
57 | ||
58 | proto = NFPROTO_IPV6; | |
59 | } else { | |
60 | goto out; | |
61 | } | |
62 | ||
63 | c = nf_ct_get(skb, &ctinfo); | |
64 | if (c) { | |
65 | skb->mark = c->mark; | |
66 | /* using overlimits stats to count how many packets marked */ | |
67 | ca->tcf_qstats.overlimits++; | |
22a5dc0e FF |
68 | goto out; |
69 | } | |
70 | ||
71 | if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb), | |
a31f1adc | 72 | proto, ca->net, &tuple)) |
22a5dc0e FF |
73 | goto out; |
74 | ||
308ac914 | 75 | zone.id = ca->zone; |
deedb590 | 76 | zone.dir = NF_CT_DEFAULT_ZONE_DIR; |
308ac914 | 77 | |
a4ffe319 | 78 | thash = nf_conntrack_find_get(ca->net, &zone, &tuple); |
22a5dc0e FF |
79 | if (!thash) |
80 | goto out; | |
81 | ||
82 | c = nf_ct_tuplehash_to_ctrack(thash); | |
83 | /* using overlimits stats to count how many packets marked */ | |
84 | ca->tcf_qstats.overlimits++; | |
85 | skb->mark = c->mark; | |
86 | nf_ct_put(c); | |
87 | ||
88 | out: | |
22a5dc0e FF |
89 | spin_unlock(&ca->tcf_lock); |
90 | return ca->tcf_action; | |
91 | } | |
92 | ||
93 | static const struct nla_policy connmark_policy[TCA_CONNMARK_MAX + 1] = { | |
94 | [TCA_CONNMARK_PARMS] = { .len = sizeof(struct tc_connmark) }, | |
95 | }; | |
96 | ||
97 | static int tcf_connmark_init(struct net *net, struct nlattr *nla, | |
a85a970a | 98 | struct nlattr *est, struct tc_action **a, |
789871bb | 99 | int ovr, int bind, bool rtnl_held, |
589dad6d | 100 | struct netlink_ext_ack *extack) |
22a5dc0e | 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 | ||
fceb6435 JB |
111 | ret = nla_parse_nested(tb, TCA_CONNMARK_MAX, nla, connmark_policy, |
112 | NULL); | |
22a5dc0e FF |
113 | if (ret < 0) |
114 | return ret; | |
115 | ||
52491c76 EN |
116 | if (!tb[TCA_CONNMARK_PARMS]) |
117 | return -EINVAL; | |
118 | ||
22a5dc0e FF |
119 | parm = nla_data(tb[TCA_CONNMARK_PARMS]); |
120 | ||
0190c1d4 VB |
121 | ret = tcf_idr_check_alloc(tn, &parm->index, a, bind); |
122 | if (!ret) { | |
65a206c0 CM |
123 | ret = tcf_idr_create(tn, parm->index, est, a, |
124 | &act_connmark_ops, bind, false); | |
0190c1d4 VB |
125 | if (ret) { |
126 | tcf_idr_cleanup(tn, parm->index); | |
22a5dc0e | 127 | return ret; |
0190c1d4 | 128 | } |
22a5dc0e | 129 | |
a85a970a | 130 | ci = to_connmark(*a); |
22a5dc0e | 131 | ci->tcf_action = parm->action; |
a4ffe319 | 132 | ci->net = net; |
22a5dc0e FF |
133 | ci->zone = parm->zone; |
134 | ||
65a206c0 | 135 | tcf_idr_insert(tn, *a); |
22a5dc0e | 136 | ret = ACT_P_CREATED; |
0190c1d4 | 137 | } else if (ret > 0) { |
a85a970a | 138 | ci = to_connmark(*a); |
22a5dc0e FF |
139 | if (bind) |
140 | return 0; | |
4e8ddd7f VB |
141 | if (!ovr) { |
142 | tcf_idr_release(*a, bind); | |
22a5dc0e | 143 | return -EEXIST; |
4e8ddd7f | 144 | } |
22a5dc0e FF |
145 | /* replacing action and zone */ |
146 | ci->tcf_action = parm->action; | |
147 | ci->zone = parm->zone; | |
0190c1d4 | 148 | ret = 0; |
22a5dc0e FF |
149 | } |
150 | ||
151 | return ret; | |
152 | } | |
153 | ||
154 | static inline int tcf_connmark_dump(struct sk_buff *skb, struct tc_action *a, | |
155 | int bind, int ref) | |
156 | { | |
157 | unsigned char *b = skb_tail_pointer(skb); | |
a85a970a | 158 | struct tcf_connmark_info *ci = to_connmark(a); |
22a5dc0e FF |
159 | |
160 | struct tc_connmark opt = { | |
161 | .index = ci->tcf_index, | |
036bb443 VB |
162 | .refcnt = refcount_read(&ci->tcf_refcnt) - ref, |
163 | .bindcnt = atomic_read(&ci->tcf_bindcnt) - bind, | |
22a5dc0e FF |
164 | .action = ci->tcf_action, |
165 | .zone = ci->zone, | |
166 | }; | |
167 | struct tcf_t t; | |
168 | ||
169 | if (nla_put(skb, TCA_CONNMARK_PARMS, sizeof(opt), &opt)) | |
170 | goto nla_put_failure; | |
171 | ||
48d8ee16 | 172 | tcf_tm_dump(&t, &ci->tcf_tm); |
9854518e ND |
173 | if (nla_put_64bit(skb, TCA_CONNMARK_TM, sizeof(t), &t, |
174 | TCA_CONNMARK_PAD)) | |
22a5dc0e FF |
175 | goto nla_put_failure; |
176 | ||
177 | return skb->len; | |
178 | nla_put_failure: | |
179 | nlmsg_trim(skb, b); | |
180 | return -1; | |
181 | } | |
182 | ||
ddf97ccd WC |
183 | static int tcf_connmark_walker(struct net *net, struct sk_buff *skb, |
184 | struct netlink_callback *cb, int type, | |
41780105 AA |
185 | const struct tc_action_ops *ops, |
186 | struct netlink_ext_ack *extack) | |
ddf97ccd WC |
187 | { |
188 | struct tc_action_net *tn = net_generic(net, connmark_net_id); | |
189 | ||
b3620145 | 190 | return tcf_generic_walker(tn, skb, cb, type, ops, extack); |
ddf97ccd WC |
191 | } |
192 | ||
331a9295 AA |
193 | static int tcf_connmark_search(struct net *net, struct tc_action **a, u32 index, |
194 | struct netlink_ext_ack *extack) | |
ddf97ccd WC |
195 | { |
196 | struct tc_action_net *tn = net_generic(net, connmark_net_id); | |
197 | ||
65a206c0 | 198 | return tcf_idr_search(tn, a, index); |
ddf97ccd WC |
199 | } |
200 | ||
b409074e VB |
201 | static int tcf_connmark_delete(struct net *net, u32 index) |
202 | { | |
203 | struct tc_action_net *tn = net_generic(net, connmark_net_id); | |
204 | ||
205 | return tcf_idr_delete_index(tn, index); | |
206 | } | |
207 | ||
22a5dc0e FF |
208 | static struct tc_action_ops act_connmark_ops = { |
209 | .kind = "connmark", | |
210 | .type = TCA_ACT_CONNMARK, | |
211 | .owner = THIS_MODULE, | |
212 | .act = tcf_connmark, | |
213 | .dump = tcf_connmark_dump, | |
214 | .init = tcf_connmark_init, | |
ddf97ccd WC |
215 | .walk = tcf_connmark_walker, |
216 | .lookup = tcf_connmark_search, | |
b409074e | 217 | .delete = tcf_connmark_delete, |
a85a970a | 218 | .size = sizeof(struct tcf_connmark_info), |
ddf97ccd WC |
219 | }; |
220 | ||
221 | static __net_init int connmark_init_net(struct net *net) | |
222 | { | |
223 | struct tc_action_net *tn = net_generic(net, connmark_net_id); | |
224 | ||
c7e460ce | 225 | return tc_action_net_init(tn, &act_connmark_ops); |
ddf97ccd WC |
226 | } |
227 | ||
039af9c6 | 228 | static void __net_exit connmark_exit_net(struct list_head *net_list) |
ddf97ccd | 229 | { |
039af9c6 | 230 | tc_action_net_exit(net_list, connmark_net_id); |
ddf97ccd WC |
231 | } |
232 | ||
233 | static struct pernet_operations connmark_net_ops = { | |
234 | .init = connmark_init_net, | |
039af9c6 | 235 | .exit_batch = connmark_exit_net, |
ddf97ccd WC |
236 | .id = &connmark_net_id, |
237 | .size = sizeof(struct tc_action_net), | |
22a5dc0e FF |
238 | }; |
239 | ||
240 | static int __init connmark_init_module(void) | |
241 | { | |
ddf97ccd | 242 | return tcf_register_action(&act_connmark_ops, &connmark_net_ops); |
22a5dc0e FF |
243 | } |
244 | ||
245 | static void __exit connmark_cleanup_module(void) | |
246 | { | |
ddf97ccd | 247 | tcf_unregister_action(&act_connmark_ops, &connmark_net_ops); |
22a5dc0e FF |
248 | } |
249 | ||
250 | module_init(connmark_init_module); | |
251 | module_exit(connmark_cleanup_module); | |
252 | MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>"); | |
253 | MODULE_DESCRIPTION("Connection tracking mark restoring"); | |
254 | MODULE_LICENSE("GPL"); | |
255 |