Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
22a5dc0e FF |
2 | /* |
3 | * net/sched/act_connmark.c netfilter connmark retriever action | |
4 | * skb mark is over-written | |
5 | * | |
6 | * Copyright (c) 2011 Felix Fietkau <nbd@openwrt.org> | |
22a5dc0e FF |
7 | */ |
8 | ||
9 | #include <linux/module.h> | |
10 | #include <linux/init.h> | |
11 | #include <linux/kernel.h> | |
12 | #include <linux/skbuff.h> | |
13 | #include <linux/rtnetlink.h> | |
14 | #include <linux/pkt_cls.h> | |
15 | #include <linux/ip.h> | |
16 | #include <linux/ipv6.h> | |
17 | #include <net/netlink.h> | |
18 | #include <net/pkt_sched.h> | |
19 | #include <net/act_api.h> | |
c53075ea | 20 | #include <net/pkt_cls.h> |
22a5dc0e FF |
21 | #include <uapi/linux/tc_act/tc_connmark.h> |
22 | #include <net/tc_act/tc_connmark.h> | |
23 | ||
24 | #include <net/netfilter/nf_conntrack.h> | |
25 | #include <net/netfilter/nf_conntrack_core.h> | |
26 | #include <net/netfilter/nf_conntrack_zones.h> | |
27 | ||
c7d03a00 | 28 | static unsigned int connmark_net_id; |
a85a970a | 29 | static struct tc_action_ops act_connmark_ops; |
ddf97ccd | 30 | |
962ad1f9 JHS |
31 | static int tcf_connmark_act(struct sk_buff *skb, const struct tc_action *a, |
32 | struct tcf_result *res) | |
22a5dc0e FF |
33 | { |
34 | const struct nf_conntrack_tuple_hash *thash; | |
35 | struct nf_conntrack_tuple tuple; | |
36 | enum ip_conntrack_info ctinfo; | |
a85a970a | 37 | struct tcf_connmark_info *ca = to_connmark(a); |
308ac914 | 38 | struct nf_conntrack_zone zone; |
22a5dc0e FF |
39 | struct nf_conn *c; |
40 | int proto; | |
41 | ||
42 | spin_lock(&ca->tcf_lock); | |
9c4a4e48 | 43 | tcf_lastuse_update(&ca->tcf_tm); |
22a5dc0e FF |
44 | bstats_update(&ca->tcf_bstats, skb); |
45 | ||
d7bf2ebe THJ |
46 | switch (skb_protocol(skb, true)) { |
47 | case htons(ETH_P_IP): | |
22a5dc0e FF |
48 | if (skb->len < sizeof(struct iphdr)) |
49 | goto out; | |
50 | ||
51 | proto = NFPROTO_IPV4; | |
d7bf2ebe THJ |
52 | break; |
53 | case htons(ETH_P_IPV6): | |
22a5dc0e FF |
54 | if (skb->len < sizeof(struct ipv6hdr)) |
55 | goto out; | |
56 | ||
57 | proto = NFPROTO_IPV6; | |
d7bf2ebe THJ |
58 | break; |
59 | default: | |
22a5dc0e FF |
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, |
abbb0d33 | 99 | struct tcf_proto *tp, u32 flags, |
589dad6d | 100 | struct netlink_ext_ack *extack) |
22a5dc0e | 101 | { |
ddf97ccd | 102 | struct tc_action_net *tn = net_generic(net, connmark_net_id); |
22a5dc0e | 103 | struct nlattr *tb[TCA_CONNMARK_MAX + 1]; |
695176bf | 104 | bool bind = flags & TCA_ACT_FLAGS_BIND; |
c53075ea | 105 | struct tcf_chain *goto_ch = NULL; |
22a5dc0e FF |
106 | struct tcf_connmark_info *ci; |
107 | struct tc_connmark *parm; | |
c53075ea | 108 | int ret = 0, err; |
7be8ef2c | 109 | u32 index; |
22a5dc0e FF |
110 | |
111 | if (!nla) | |
112 | return -EINVAL; | |
113 | ||
8cb08174 JB |
114 | ret = nla_parse_nested_deprecated(tb, TCA_CONNMARK_MAX, nla, |
115 | connmark_policy, NULL); | |
22a5dc0e FF |
116 | if (ret < 0) |
117 | return ret; | |
118 | ||
52491c76 EN |
119 | if (!tb[TCA_CONNMARK_PARMS]) |
120 | return -EINVAL; | |
121 | ||
22a5dc0e | 122 | parm = nla_data(tb[TCA_CONNMARK_PARMS]); |
7be8ef2c DL |
123 | index = parm->index; |
124 | ret = tcf_idr_check_alloc(tn, &index, a, bind); | |
0190c1d4 | 125 | if (!ret) { |
7be8ef2c | 126 | ret = tcf_idr_create(tn, index, est, a, |
40bd094d | 127 | &act_connmark_ops, bind, false, flags); |
0190c1d4 | 128 | if (ret) { |
7be8ef2c | 129 | tcf_idr_cleanup(tn, index); |
22a5dc0e | 130 | return ret; |
0190c1d4 | 131 | } |
22a5dc0e | 132 | |
a85a970a | 133 | ci = to_connmark(*a); |
c53075ea DC |
134 | err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, |
135 | extack); | |
136 | if (err < 0) | |
137 | goto release_idr; | |
138 | tcf_action_set_ctrlact(*a, parm->action, goto_ch); | |
a4ffe319 | 139 | ci->net = net; |
22a5dc0e FF |
140 | ci->zone = parm->zone; |
141 | ||
22a5dc0e | 142 | ret = ACT_P_CREATED; |
0190c1d4 | 143 | } else if (ret > 0) { |
a85a970a | 144 | ci = to_connmark(*a); |
22a5dc0e FF |
145 | if (bind) |
146 | return 0; | |
695176bf | 147 | if (!(flags & TCA_ACT_FLAGS_REPLACE)) { |
4e8ddd7f | 148 | tcf_idr_release(*a, bind); |
22a5dc0e | 149 | return -EEXIST; |
4e8ddd7f | 150 | } |
c53075ea DC |
151 | err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, |
152 | extack); | |
153 | if (err < 0) | |
154 | goto release_idr; | |
22a5dc0e | 155 | /* replacing action and zone */ |
506a03aa | 156 | spin_lock_bh(&ci->tcf_lock); |
c53075ea | 157 | goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch); |
22a5dc0e | 158 | ci->zone = parm->zone; |
506a03aa | 159 | spin_unlock_bh(&ci->tcf_lock); |
c53075ea DC |
160 | if (goto_ch) |
161 | tcf_chain_put_by_act(goto_ch); | |
0190c1d4 | 162 | ret = 0; |
22a5dc0e FF |
163 | } |
164 | ||
165 | return ret; | |
c53075ea DC |
166 | release_idr: |
167 | tcf_idr_release(*a, bind); | |
168 | return err; | |
22a5dc0e FF |
169 | } |
170 | ||
171 | static inline int tcf_connmark_dump(struct sk_buff *skb, struct tc_action *a, | |
172 | int bind, int ref) | |
173 | { | |
174 | unsigned char *b = skb_tail_pointer(skb); | |
a85a970a | 175 | struct tcf_connmark_info *ci = to_connmark(a); |
22a5dc0e FF |
176 | struct tc_connmark opt = { |
177 | .index = ci->tcf_index, | |
036bb443 VB |
178 | .refcnt = refcount_read(&ci->tcf_refcnt) - ref, |
179 | .bindcnt = atomic_read(&ci->tcf_bindcnt) - bind, | |
22a5dc0e FF |
180 | }; |
181 | struct tcf_t t; | |
182 | ||
506a03aa CW |
183 | spin_lock_bh(&ci->tcf_lock); |
184 | opt.action = ci->tcf_action; | |
185 | opt.zone = ci->zone; | |
22a5dc0e FF |
186 | if (nla_put(skb, TCA_CONNMARK_PARMS, sizeof(opt), &opt)) |
187 | goto nla_put_failure; | |
188 | ||
48d8ee16 | 189 | tcf_tm_dump(&t, &ci->tcf_tm); |
9854518e ND |
190 | if (nla_put_64bit(skb, TCA_CONNMARK_TM, sizeof(t), &t, |
191 | TCA_CONNMARK_PAD)) | |
22a5dc0e | 192 | goto nla_put_failure; |
506a03aa | 193 | spin_unlock_bh(&ci->tcf_lock); |
22a5dc0e FF |
194 | |
195 | return skb->len; | |
506a03aa | 196 | |
22a5dc0e | 197 | nla_put_failure: |
506a03aa | 198 | spin_unlock_bh(&ci->tcf_lock); |
22a5dc0e FF |
199 | nlmsg_trim(skb, b); |
200 | return -1; | |
201 | } | |
202 | ||
ddf97ccd WC |
203 | static int tcf_connmark_walker(struct net *net, struct sk_buff *skb, |
204 | struct netlink_callback *cb, int type, | |
41780105 AA |
205 | const struct tc_action_ops *ops, |
206 | struct netlink_ext_ack *extack) | |
ddf97ccd WC |
207 | { |
208 | struct tc_action_net *tn = net_generic(net, connmark_net_id); | |
209 | ||
b3620145 | 210 | return tcf_generic_walker(tn, skb, cb, type, ops, extack); |
ddf97ccd WC |
211 | } |
212 | ||
f061b48c | 213 | static int tcf_connmark_search(struct net *net, struct tc_action **a, u32 index) |
ddf97ccd WC |
214 | { |
215 | struct tc_action_net *tn = net_generic(net, connmark_net_id); | |
216 | ||
65a206c0 | 217 | return tcf_idr_search(tn, a, index); |
ddf97ccd WC |
218 | } |
219 | ||
22a5dc0e FF |
220 | static struct tc_action_ops act_connmark_ops = { |
221 | .kind = "connmark", | |
eddd2cf1 | 222 | .id = TCA_ID_CONNMARK, |
22a5dc0e | 223 | .owner = THIS_MODULE, |
962ad1f9 | 224 | .act = tcf_connmark_act, |
22a5dc0e FF |
225 | .dump = tcf_connmark_dump, |
226 | .init = tcf_connmark_init, | |
ddf97ccd WC |
227 | .walk = tcf_connmark_walker, |
228 | .lookup = tcf_connmark_search, | |
a85a970a | 229 | .size = sizeof(struct tcf_connmark_info), |
ddf97ccd WC |
230 | }; |
231 | ||
232 | static __net_init int connmark_init_net(struct net *net) | |
233 | { | |
234 | struct tc_action_net *tn = net_generic(net, connmark_net_id); | |
235 | ||
981471bd | 236 | return tc_action_net_init(net, tn, &act_connmark_ops); |
ddf97ccd WC |
237 | } |
238 | ||
039af9c6 | 239 | static void __net_exit connmark_exit_net(struct list_head *net_list) |
ddf97ccd | 240 | { |
039af9c6 | 241 | tc_action_net_exit(net_list, connmark_net_id); |
ddf97ccd WC |
242 | } |
243 | ||
244 | static struct pernet_operations connmark_net_ops = { | |
245 | .init = connmark_init_net, | |
039af9c6 | 246 | .exit_batch = connmark_exit_net, |
ddf97ccd WC |
247 | .id = &connmark_net_id, |
248 | .size = sizeof(struct tc_action_net), | |
22a5dc0e FF |
249 | }; |
250 | ||
251 | static int __init connmark_init_module(void) | |
252 | { | |
ddf97ccd | 253 | return tcf_register_action(&act_connmark_ops, &connmark_net_ops); |
22a5dc0e FF |
254 | } |
255 | ||
256 | static void __exit connmark_cleanup_module(void) | |
257 | { | |
ddf97ccd | 258 | tcf_unregister_action(&act_connmark_ops, &connmark_net_ops); |
22a5dc0e FF |
259 | } |
260 | ||
261 | module_init(connmark_init_module); | |
262 | module_exit(connmark_cleanup_module); | |
263 | MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>"); | |
264 | MODULE_DESCRIPTION("Connection tracking mark restoring"); | |
265 | MODULE_LICENSE("GPL"); |