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 | ||
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, |
85d0966f | 97 | struct tcf_proto *tp, |
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; |
22a5dc0e FF |
106 | |
107 | if (!nla) | |
108 | return -EINVAL; | |
109 | ||
8cb08174 JB |
110 | ret = nla_parse_nested_deprecated(tb, TCA_CONNMARK_MAX, nla, |
111 | connmark_policy, NULL); | |
22a5dc0e FF |
112 | if (ret < 0) |
113 | return ret; | |
114 | ||
52491c76 EN |
115 | if (!tb[TCA_CONNMARK_PARMS]) |
116 | return -EINVAL; | |
117 | ||
22a5dc0e FF |
118 | parm = nla_data(tb[TCA_CONNMARK_PARMS]); |
119 | ||
0190c1d4 VB |
120 | ret = tcf_idr_check_alloc(tn, &parm->index, a, bind); |
121 | if (!ret) { | |
65a206c0 CM |
122 | ret = tcf_idr_create(tn, parm->index, est, a, |
123 | &act_connmark_ops, bind, false); | |
0190c1d4 VB |
124 | if (ret) { |
125 | tcf_idr_cleanup(tn, parm->index); | |
22a5dc0e | 126 | return ret; |
0190c1d4 | 127 | } |
22a5dc0e | 128 | |
a85a970a | 129 | ci = to_connmark(*a); |
c53075ea DC |
130 | err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, |
131 | extack); | |
132 | if (err < 0) | |
133 | goto release_idr; | |
134 | tcf_action_set_ctrlact(*a, parm->action, goto_ch); | |
a4ffe319 | 135 | ci->net = net; |
22a5dc0e FF |
136 | ci->zone = parm->zone; |
137 | ||
65a206c0 | 138 | tcf_idr_insert(tn, *a); |
22a5dc0e | 139 | ret = ACT_P_CREATED; |
0190c1d4 | 140 | } else if (ret > 0) { |
a85a970a | 141 | ci = to_connmark(*a); |
22a5dc0e FF |
142 | if (bind) |
143 | return 0; | |
4e8ddd7f VB |
144 | if (!ovr) { |
145 | tcf_idr_release(*a, bind); | |
22a5dc0e | 146 | return -EEXIST; |
4e8ddd7f | 147 | } |
c53075ea DC |
148 | err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, |
149 | extack); | |
150 | if (err < 0) | |
151 | goto release_idr; | |
22a5dc0e | 152 | /* replacing action and zone */ |
506a03aa | 153 | spin_lock_bh(&ci->tcf_lock); |
c53075ea | 154 | goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch); |
22a5dc0e | 155 | ci->zone = parm->zone; |
506a03aa | 156 | spin_unlock_bh(&ci->tcf_lock); |
c53075ea DC |
157 | if (goto_ch) |
158 | tcf_chain_put_by_act(goto_ch); | |
0190c1d4 | 159 | ret = 0; |
22a5dc0e FF |
160 | } |
161 | ||
162 | return ret; | |
c53075ea DC |
163 | release_idr: |
164 | tcf_idr_release(*a, bind); | |
165 | return err; | |
22a5dc0e FF |
166 | } |
167 | ||
168 | static inline int tcf_connmark_dump(struct sk_buff *skb, struct tc_action *a, | |
169 | int bind, int ref) | |
170 | { | |
171 | unsigned char *b = skb_tail_pointer(skb); | |
a85a970a | 172 | struct tcf_connmark_info *ci = to_connmark(a); |
22a5dc0e FF |
173 | struct tc_connmark opt = { |
174 | .index = ci->tcf_index, | |
036bb443 VB |
175 | .refcnt = refcount_read(&ci->tcf_refcnt) - ref, |
176 | .bindcnt = atomic_read(&ci->tcf_bindcnt) - bind, | |
22a5dc0e FF |
177 | }; |
178 | struct tcf_t t; | |
179 | ||
506a03aa CW |
180 | spin_lock_bh(&ci->tcf_lock); |
181 | opt.action = ci->tcf_action; | |
182 | opt.zone = ci->zone; | |
22a5dc0e FF |
183 | if (nla_put(skb, TCA_CONNMARK_PARMS, sizeof(opt), &opt)) |
184 | goto nla_put_failure; | |
185 | ||
48d8ee16 | 186 | tcf_tm_dump(&t, &ci->tcf_tm); |
9854518e ND |
187 | if (nla_put_64bit(skb, TCA_CONNMARK_TM, sizeof(t), &t, |
188 | TCA_CONNMARK_PAD)) | |
22a5dc0e | 189 | goto nla_put_failure; |
506a03aa | 190 | spin_unlock_bh(&ci->tcf_lock); |
22a5dc0e FF |
191 | |
192 | return skb->len; | |
506a03aa | 193 | |
22a5dc0e | 194 | nla_put_failure: |
506a03aa | 195 | spin_unlock_bh(&ci->tcf_lock); |
22a5dc0e FF |
196 | nlmsg_trim(skb, b); |
197 | return -1; | |
198 | } | |
199 | ||
ddf97ccd WC |
200 | static int tcf_connmark_walker(struct net *net, struct sk_buff *skb, |
201 | struct netlink_callback *cb, int type, | |
41780105 AA |
202 | const struct tc_action_ops *ops, |
203 | struct netlink_ext_ack *extack) | |
ddf97ccd WC |
204 | { |
205 | struct tc_action_net *tn = net_generic(net, connmark_net_id); | |
206 | ||
b3620145 | 207 | return tcf_generic_walker(tn, skb, cb, type, ops, extack); |
ddf97ccd WC |
208 | } |
209 | ||
f061b48c | 210 | static int tcf_connmark_search(struct net *net, struct tc_action **a, u32 index) |
ddf97ccd WC |
211 | { |
212 | struct tc_action_net *tn = net_generic(net, connmark_net_id); | |
213 | ||
65a206c0 | 214 | return tcf_idr_search(tn, a, index); |
ddf97ccd WC |
215 | } |
216 | ||
22a5dc0e FF |
217 | static struct tc_action_ops act_connmark_ops = { |
218 | .kind = "connmark", | |
eddd2cf1 | 219 | .id = TCA_ID_CONNMARK, |
22a5dc0e | 220 | .owner = THIS_MODULE, |
962ad1f9 | 221 | .act = tcf_connmark_act, |
22a5dc0e FF |
222 | .dump = tcf_connmark_dump, |
223 | .init = tcf_connmark_init, | |
ddf97ccd WC |
224 | .walk = tcf_connmark_walker, |
225 | .lookup = tcf_connmark_search, | |
a85a970a | 226 | .size = sizeof(struct tcf_connmark_info), |
ddf97ccd WC |
227 | }; |
228 | ||
229 | static __net_init int connmark_init_net(struct net *net) | |
230 | { | |
231 | struct tc_action_net *tn = net_generic(net, connmark_net_id); | |
232 | ||
c7e460ce | 233 | return tc_action_net_init(tn, &act_connmark_ops); |
ddf97ccd WC |
234 | } |
235 | ||
039af9c6 | 236 | static void __net_exit connmark_exit_net(struct list_head *net_list) |
ddf97ccd | 237 | { |
039af9c6 | 238 | tc_action_net_exit(net_list, connmark_net_id); |
ddf97ccd WC |
239 | } |
240 | ||
241 | static struct pernet_operations connmark_net_ops = { | |
242 | .init = connmark_init_net, | |
039af9c6 | 243 | .exit_batch = connmark_exit_net, |
ddf97ccd WC |
244 | .id = &connmark_net_id, |
245 | .size = sizeof(struct tc_action_net), | |
22a5dc0e FF |
246 | }; |
247 | ||
248 | static int __init connmark_init_module(void) | |
249 | { | |
ddf97ccd | 250 | return tcf_register_action(&act_connmark_ops, &connmark_net_ops); |
22a5dc0e FF |
251 | } |
252 | ||
253 | static void __exit connmark_cleanup_module(void) | |
254 | { | |
ddf97ccd | 255 | tcf_unregister_action(&act_connmark_ops, &connmark_net_ops); |
22a5dc0e FF |
256 | } |
257 | ||
258 | module_init(connmark_init_module); | |
259 | module_exit(connmark_cleanup_module); | |
260 | MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>"); | |
261 | MODULE_DESCRIPTION("Connection tracking mark restoring"); | |
262 | MODULE_LICENSE("GPL"); |