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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 | ||
46 | if (skb->protocol == htons(ETH_P_IP)) { | |
47 | if (skb->len < sizeof(struct iphdr)) | |
48 | goto out; | |
49 | ||
50 | proto = NFPROTO_IPV4; | |
51 | } else if (skb->protocol == htons(ETH_P_IPV6)) { | |
52 | if (skb->len < sizeof(struct ipv6hdr)) | |
53 | goto out; | |
54 | ||
55 | proto = NFPROTO_IPV6; | |
56 | } else { | |
57 | goto out; | |
58 | } | |
59 | ||
60 | c = nf_ct_get(skb, &ctinfo); | |
61 | if (c) { | |
62 | skb->mark = c->mark; | |
63 | /* using overlimits stats to count how many packets marked */ | |
64 | ca->tcf_qstats.overlimits++; | |
22a5dc0e FF |
65 | goto out; |
66 | } | |
67 | ||
68 | if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb), | |
a31f1adc | 69 | proto, ca->net, &tuple)) |
22a5dc0e FF |
70 | goto out; |
71 | ||
308ac914 | 72 | zone.id = ca->zone; |
deedb590 | 73 | zone.dir = NF_CT_DEFAULT_ZONE_DIR; |
308ac914 | 74 | |
a4ffe319 | 75 | thash = nf_conntrack_find_get(ca->net, &zone, &tuple); |
22a5dc0e FF |
76 | if (!thash) |
77 | goto out; | |
78 | ||
79 | c = nf_ct_tuplehash_to_ctrack(thash); | |
80 | /* using overlimits stats to count how many packets marked */ | |
81 | ca->tcf_qstats.overlimits++; | |
82 | skb->mark = c->mark; | |
83 | nf_ct_put(c); | |
84 | ||
85 | out: | |
22a5dc0e FF |
86 | spin_unlock(&ca->tcf_lock); |
87 | return ca->tcf_action; | |
88 | } | |
89 | ||
90 | static const struct nla_policy connmark_policy[TCA_CONNMARK_MAX + 1] = { | |
91 | [TCA_CONNMARK_PARMS] = { .len = sizeof(struct tc_connmark) }, | |
92 | }; | |
93 | ||
94 | static int tcf_connmark_init(struct net *net, struct nlattr *nla, | |
a85a970a | 95 | struct nlattr *est, struct tc_action **a, |
789871bb | 96 | int ovr, int bind, bool rtnl_held, |
abbb0d33 | 97 | struct tcf_proto *tp, u32 flags, |
589dad6d | 98 | struct netlink_ext_ack *extack) |
22a5dc0e | 99 | { |
ddf97ccd | 100 | struct tc_action_net *tn = net_generic(net, connmark_net_id); |
22a5dc0e | 101 | struct nlattr *tb[TCA_CONNMARK_MAX + 1]; |
c53075ea | 102 | struct tcf_chain *goto_ch = NULL; |
22a5dc0e FF |
103 | struct tcf_connmark_info *ci; |
104 | struct tc_connmark *parm; | |
c53075ea | 105 | int ret = 0, err; |
7be8ef2c | 106 | u32 index; |
22a5dc0e FF |
107 | |
108 | if (!nla) | |
109 | return -EINVAL; | |
110 | ||
8cb08174 JB |
111 | ret = nla_parse_nested_deprecated(tb, TCA_CONNMARK_MAX, nla, |
112 | connmark_policy, NULL); | |
22a5dc0e FF |
113 | if (ret < 0) |
114 | return ret; | |
115 | ||
52491c76 EN |
116 | if (!tb[TCA_CONNMARK_PARMS]) |
117 | return -EINVAL; | |
118 | ||
22a5dc0e | 119 | parm = nla_data(tb[TCA_CONNMARK_PARMS]); |
7be8ef2c DL |
120 | index = parm->index; |
121 | ret = tcf_idr_check_alloc(tn, &index, a, bind); | |
0190c1d4 | 122 | if (!ret) { |
7be8ef2c | 123 | ret = tcf_idr_create(tn, index, est, a, |
e3822678 | 124 | &act_connmark_ops, bind, false, 0); |
0190c1d4 | 125 | if (ret) { |
7be8ef2c | 126 | tcf_idr_cleanup(tn, index); |
22a5dc0e | 127 | return ret; |
0190c1d4 | 128 | } |
22a5dc0e | 129 | |
a85a970a | 130 | ci = to_connmark(*a); |
c53075ea DC |
131 | err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, |
132 | extack); | |
133 | if (err < 0) | |
134 | goto release_idr; | |
135 | tcf_action_set_ctrlact(*a, parm->action, goto_ch); | |
a4ffe319 | 136 | ci->net = net; |
22a5dc0e FF |
137 | ci->zone = parm->zone; |
138 | ||
65a206c0 | 139 | tcf_idr_insert(tn, *a); |
22a5dc0e | 140 | ret = ACT_P_CREATED; |
0190c1d4 | 141 | } else if (ret > 0) { |
a85a970a | 142 | ci = to_connmark(*a); |
22a5dc0e FF |
143 | if (bind) |
144 | return 0; | |
4e8ddd7f VB |
145 | if (!ovr) { |
146 | tcf_idr_release(*a, bind); | |
22a5dc0e | 147 | return -EEXIST; |
4e8ddd7f | 148 | } |
c53075ea DC |
149 | err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, |
150 | extack); | |
151 | if (err < 0) | |
152 | goto release_idr; | |
22a5dc0e | 153 | /* replacing action and zone */ |
506a03aa | 154 | spin_lock_bh(&ci->tcf_lock); |
c53075ea | 155 | goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch); |
22a5dc0e | 156 | ci->zone = parm->zone; |
506a03aa | 157 | spin_unlock_bh(&ci->tcf_lock); |
c53075ea DC |
158 | if (goto_ch) |
159 | tcf_chain_put_by_act(goto_ch); | |
0190c1d4 | 160 | ret = 0; |
22a5dc0e FF |
161 | } |
162 | ||
163 | return ret; | |
c53075ea DC |
164 | release_idr: |
165 | tcf_idr_release(*a, bind); | |
166 | return err; | |
22a5dc0e FF |
167 | } |
168 | ||
169 | static inline int tcf_connmark_dump(struct sk_buff *skb, struct tc_action *a, | |
170 | int bind, int ref) | |
171 | { | |
172 | unsigned char *b = skb_tail_pointer(skb); | |
a85a970a | 173 | struct tcf_connmark_info *ci = to_connmark(a); |
22a5dc0e FF |
174 | struct tc_connmark opt = { |
175 | .index = ci->tcf_index, | |
036bb443 VB |
176 | .refcnt = refcount_read(&ci->tcf_refcnt) - ref, |
177 | .bindcnt = atomic_read(&ci->tcf_bindcnt) - bind, | |
22a5dc0e FF |
178 | }; |
179 | struct tcf_t t; | |
180 | ||
506a03aa CW |
181 | spin_lock_bh(&ci->tcf_lock); |
182 | opt.action = ci->tcf_action; | |
183 | opt.zone = ci->zone; | |
22a5dc0e FF |
184 | if (nla_put(skb, TCA_CONNMARK_PARMS, sizeof(opt), &opt)) |
185 | goto nla_put_failure; | |
186 | ||
48d8ee16 | 187 | tcf_tm_dump(&t, &ci->tcf_tm); |
9854518e ND |
188 | if (nla_put_64bit(skb, TCA_CONNMARK_TM, sizeof(t), &t, |
189 | TCA_CONNMARK_PAD)) | |
22a5dc0e | 190 | goto nla_put_failure; |
506a03aa | 191 | spin_unlock_bh(&ci->tcf_lock); |
22a5dc0e FF |
192 | |
193 | return skb->len; | |
506a03aa | 194 | |
22a5dc0e | 195 | nla_put_failure: |
506a03aa | 196 | spin_unlock_bh(&ci->tcf_lock); |
22a5dc0e FF |
197 | nlmsg_trim(skb, b); |
198 | return -1; | |
199 | } | |
200 | ||
ddf97ccd WC |
201 | static int tcf_connmark_walker(struct net *net, struct sk_buff *skb, |
202 | struct netlink_callback *cb, int type, | |
41780105 AA |
203 | const struct tc_action_ops *ops, |
204 | struct netlink_ext_ack *extack) | |
ddf97ccd WC |
205 | { |
206 | struct tc_action_net *tn = net_generic(net, connmark_net_id); | |
207 | ||
b3620145 | 208 | return tcf_generic_walker(tn, skb, cb, type, ops, extack); |
ddf97ccd WC |
209 | } |
210 | ||
f061b48c | 211 | static int tcf_connmark_search(struct net *net, struct tc_action **a, u32 index) |
ddf97ccd WC |
212 | { |
213 | struct tc_action_net *tn = net_generic(net, connmark_net_id); | |
214 | ||
65a206c0 | 215 | return tcf_idr_search(tn, a, index); |
ddf97ccd WC |
216 | } |
217 | ||
22a5dc0e FF |
218 | static struct tc_action_ops act_connmark_ops = { |
219 | .kind = "connmark", | |
eddd2cf1 | 220 | .id = TCA_ID_CONNMARK, |
22a5dc0e | 221 | .owner = THIS_MODULE, |
962ad1f9 | 222 | .act = tcf_connmark_act, |
22a5dc0e FF |
223 | .dump = tcf_connmark_dump, |
224 | .init = tcf_connmark_init, | |
ddf97ccd WC |
225 | .walk = tcf_connmark_walker, |
226 | .lookup = tcf_connmark_search, | |
a85a970a | 227 | .size = sizeof(struct tcf_connmark_info), |
ddf97ccd WC |
228 | }; |
229 | ||
230 | static __net_init int connmark_init_net(struct net *net) | |
231 | { | |
232 | struct tc_action_net *tn = net_generic(net, connmark_net_id); | |
233 | ||
981471bd | 234 | return tc_action_net_init(net, tn, &act_connmark_ops); |
ddf97ccd WC |
235 | } |
236 | ||
039af9c6 | 237 | static void __net_exit connmark_exit_net(struct list_head *net_list) |
ddf97ccd | 238 | { |
039af9c6 | 239 | tc_action_net_exit(net_list, connmark_net_id); |
ddf97ccd WC |
240 | } |
241 | ||
242 | static struct pernet_operations connmark_net_ops = { | |
243 | .init = connmark_init_net, | |
039af9c6 | 244 | .exit_batch = connmark_exit_net, |
ddf97ccd WC |
245 | .id = &connmark_net_id, |
246 | .size = sizeof(struct tc_action_net), | |
22a5dc0e FF |
247 | }; |
248 | ||
249 | static int __init connmark_init_module(void) | |
250 | { | |
ddf97ccd | 251 | return tcf_register_action(&act_connmark_ops, &connmark_net_ops); |
22a5dc0e FF |
252 | } |
253 | ||
254 | static void __exit connmark_cleanup_module(void) | |
255 | { | |
ddf97ccd | 256 | tcf_unregister_action(&act_connmark_ops, &connmark_net_ops); |
22a5dc0e FF |
257 | } |
258 | ||
259 | module_init(connmark_init_module); | |
260 | module_exit(connmark_cleanup_module); | |
261 | MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>"); | |
262 | MODULE_DESCRIPTION("Connection tracking mark restoring"); | |
263 | MODULE_LICENSE("GPL"); |