]>
Commit | Line | Data |
---|---|---|
d0f6dd8a AV |
1 | /* |
2 | * Copyright (c) 2016, Amir Vadai <amir@vadai.me> | |
3 | * Copyright (c) 2016, Mellanox Technologies. All rights reserved. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | */ | |
10 | ||
11 | #include <linux/module.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/skbuff.h> | |
15 | #include <linux/rtnetlink.h> | |
16 | #include <net/netlink.h> | |
17 | #include <net/pkt_sched.h> | |
18 | #include <net/dst.h> | |
d0f6dd8a AV |
19 | |
20 | #include <linux/tc_act/tc_tunnel_key.h> | |
21 | #include <net/tc_act/tc_tunnel_key.h> | |
22 | ||
23 | #define TUNNEL_KEY_TAB_MASK 15 | |
24 | ||
c7d03a00 | 25 | static unsigned int tunnel_key_net_id; |
d0f6dd8a AV |
26 | static struct tc_action_ops act_tunnel_key_ops; |
27 | ||
28 | static int tunnel_key_act(struct sk_buff *skb, const struct tc_action *a, | |
29 | struct tcf_result *res) | |
30 | { | |
31 | struct tcf_tunnel_key *t = to_tunnel_key(a); | |
32 | struct tcf_tunnel_key_params *params; | |
33 | int action; | |
34 | ||
35 | rcu_read_lock(); | |
36 | ||
37 | params = rcu_dereference(t->params); | |
38 | ||
39 | tcf_lastuse_update(&t->tcf_tm); | |
40 | bstats_cpu_update(this_cpu_ptr(t->common.cpu_bstats), skb); | |
41 | action = params->action; | |
42 | ||
43 | switch (params->tcft_action) { | |
44 | case TCA_TUNNEL_KEY_ACT_RELEASE: | |
45 | skb_dst_drop(skb); | |
46 | break; | |
47 | case TCA_TUNNEL_KEY_ACT_SET: | |
48 | skb_dst_drop(skb); | |
49 | skb_dst_set(skb, dst_clone(¶ms->tcft_enc_metadata->dst)); | |
50 | break; | |
51 | default: | |
52 | WARN_ONCE(1, "Bad tunnel_key action %d.\n", | |
53 | params->tcft_action); | |
54 | break; | |
55 | } | |
56 | ||
57 | rcu_read_unlock(); | |
58 | ||
59 | return action; | |
60 | } | |
61 | ||
62 | static const struct nla_policy tunnel_key_policy[TCA_TUNNEL_KEY_MAX + 1] = { | |
63 | [TCA_TUNNEL_KEY_PARMS] = { .len = sizeof(struct tc_tunnel_key) }, | |
64 | [TCA_TUNNEL_KEY_ENC_IPV4_SRC] = { .type = NLA_U32 }, | |
65 | [TCA_TUNNEL_KEY_ENC_IPV4_DST] = { .type = NLA_U32 }, | |
66 | [TCA_TUNNEL_KEY_ENC_IPV6_SRC] = { .len = sizeof(struct in6_addr) }, | |
67 | [TCA_TUNNEL_KEY_ENC_IPV6_DST] = { .len = sizeof(struct in6_addr) }, | |
68 | [TCA_TUNNEL_KEY_ENC_KEY_ID] = { .type = NLA_U32 }, | |
75bfbca0 | 69 | [TCA_TUNNEL_KEY_ENC_DST_PORT] = {.type = NLA_U16}, |
d0f6dd8a AV |
70 | }; |
71 | ||
72 | static int tunnel_key_init(struct net *net, struct nlattr *nla, | |
73 | struct nlattr *est, struct tc_action **a, | |
74 | int ovr, int bind) | |
75 | { | |
76 | struct tc_action_net *tn = net_generic(net, tunnel_key_net_id); | |
77 | struct nlattr *tb[TCA_TUNNEL_KEY_MAX + 1]; | |
78 | struct tcf_tunnel_key_params *params_old; | |
79 | struct tcf_tunnel_key_params *params_new; | |
80 | struct metadata_dst *metadata = NULL; | |
81 | struct tc_tunnel_key *parm; | |
82 | struct tcf_tunnel_key *t; | |
83 | bool exists = false; | |
75bfbca0 | 84 | __be16 dst_port = 0; |
d0f6dd8a AV |
85 | __be64 key_id; |
86 | int ret = 0; | |
87 | int err; | |
88 | ||
89 | if (!nla) | |
90 | return -EINVAL; | |
91 | ||
fceb6435 JB |
92 | err = nla_parse_nested(tb, TCA_TUNNEL_KEY_MAX, nla, tunnel_key_policy, |
93 | NULL); | |
d0f6dd8a AV |
94 | if (err < 0) |
95 | return err; | |
96 | ||
97 | if (!tb[TCA_TUNNEL_KEY_PARMS]) | |
98 | return -EINVAL; | |
99 | ||
100 | parm = nla_data(tb[TCA_TUNNEL_KEY_PARMS]); | |
101 | exists = tcf_hash_check(tn, parm->index, a, bind); | |
102 | if (exists && bind) | |
103 | return 0; | |
104 | ||
105 | switch (parm->t_action) { | |
106 | case TCA_TUNNEL_KEY_ACT_RELEASE: | |
107 | break; | |
108 | case TCA_TUNNEL_KEY_ACT_SET: | |
109 | if (!tb[TCA_TUNNEL_KEY_ENC_KEY_ID]) { | |
110 | ret = -EINVAL; | |
111 | goto err_out; | |
112 | } | |
113 | ||
114 | key_id = key32_to_tunnel_id(nla_get_be32(tb[TCA_TUNNEL_KEY_ENC_KEY_ID])); | |
115 | ||
75bfbca0 HHZ |
116 | if (tb[TCA_TUNNEL_KEY_ENC_DST_PORT]) |
117 | dst_port = nla_get_be16(tb[TCA_TUNNEL_KEY_ENC_DST_PORT]); | |
118 | ||
d0f6dd8a AV |
119 | if (tb[TCA_TUNNEL_KEY_ENC_IPV4_SRC] && |
120 | tb[TCA_TUNNEL_KEY_ENC_IPV4_DST]) { | |
121 | __be32 saddr; | |
122 | __be32 daddr; | |
123 | ||
124 | saddr = nla_get_in_addr(tb[TCA_TUNNEL_KEY_ENC_IPV4_SRC]); | |
125 | daddr = nla_get_in_addr(tb[TCA_TUNNEL_KEY_ENC_IPV4_DST]); | |
126 | ||
127 | metadata = __ip_tun_set_dst(saddr, daddr, 0, 0, | |
75bfbca0 HHZ |
128 | dst_port, TUNNEL_KEY, |
129 | key_id, 0); | |
d0f6dd8a AV |
130 | } else if (tb[TCA_TUNNEL_KEY_ENC_IPV6_SRC] && |
131 | tb[TCA_TUNNEL_KEY_ENC_IPV6_DST]) { | |
132 | struct in6_addr saddr; | |
133 | struct in6_addr daddr; | |
134 | ||
135 | saddr = nla_get_in6_addr(tb[TCA_TUNNEL_KEY_ENC_IPV6_SRC]); | |
136 | daddr = nla_get_in6_addr(tb[TCA_TUNNEL_KEY_ENC_IPV6_DST]); | |
137 | ||
dc594ecd OG |
138 | metadata = __ipv6_tun_set_dst(&saddr, &daddr, 0, 0, dst_port, |
139 | 0, TUNNEL_KEY, | |
75bfbca0 | 140 | key_id, 0); |
d0f6dd8a AV |
141 | } |
142 | ||
143 | if (!metadata) { | |
144 | ret = -EINVAL; | |
145 | goto err_out; | |
146 | } | |
147 | ||
148 | metadata->u.tun_info.mode |= IP_TUNNEL_INFO_TX; | |
149 | break; | |
150 | default: | |
151 | goto err_out; | |
152 | } | |
153 | ||
154 | if (!exists) { | |
155 | ret = tcf_hash_create(tn, parm->index, est, a, | |
156 | &act_tunnel_key_ops, bind, true); | |
157 | if (ret) | |
158 | return ret; | |
159 | ||
160 | ret = ACT_P_CREATED; | |
161 | } else { | |
162 | tcf_hash_release(*a, bind); | |
163 | if (!ovr) | |
164 | return -EEXIST; | |
165 | } | |
166 | ||
167 | t = to_tunnel_key(*a); | |
168 | ||
169 | ASSERT_RTNL(); | |
170 | params_new = kzalloc(sizeof(*params_new), GFP_KERNEL); | |
171 | if (unlikely(!params_new)) { | |
172 | if (ret == ACT_P_CREATED) | |
173 | tcf_hash_release(*a, bind); | |
174 | return -ENOMEM; | |
175 | } | |
176 | ||
177 | params_old = rtnl_dereference(t->params); | |
178 | ||
179 | params_new->action = parm->action; | |
180 | params_new->tcft_action = parm->t_action; | |
181 | params_new->tcft_enc_metadata = metadata; | |
182 | ||
183 | rcu_assign_pointer(t->params, params_new); | |
184 | ||
185 | if (params_old) | |
186 | kfree_rcu(params_old, rcu); | |
187 | ||
188 | if (ret == ACT_P_CREATED) | |
189 | tcf_hash_insert(tn, *a); | |
190 | ||
191 | return ret; | |
192 | ||
193 | err_out: | |
194 | if (exists) | |
195 | tcf_hash_release(*a, bind); | |
196 | return ret; | |
197 | } | |
198 | ||
199 | static void tunnel_key_release(struct tc_action *a, int bind) | |
200 | { | |
201 | struct tcf_tunnel_key *t = to_tunnel_key(a); | |
202 | struct tcf_tunnel_key_params *params; | |
203 | ||
07c0f09e | 204 | params = rcu_dereference_protected(t->params, 1); |
d0f6dd8a AV |
205 | |
206 | if (params->tcft_action == TCA_TUNNEL_KEY_ACT_SET) | |
207 | dst_release(¶ms->tcft_enc_metadata->dst); | |
208 | ||
209 | kfree_rcu(params, rcu); | |
d0f6dd8a AV |
210 | } |
211 | ||
212 | static int tunnel_key_dump_addresses(struct sk_buff *skb, | |
213 | const struct ip_tunnel_info *info) | |
214 | { | |
215 | unsigned short family = ip_tunnel_info_af(info); | |
216 | ||
217 | if (family == AF_INET) { | |
218 | __be32 saddr = info->key.u.ipv4.src; | |
219 | __be32 daddr = info->key.u.ipv4.dst; | |
220 | ||
221 | if (!nla_put_in_addr(skb, TCA_TUNNEL_KEY_ENC_IPV4_SRC, saddr) && | |
222 | !nla_put_in_addr(skb, TCA_TUNNEL_KEY_ENC_IPV4_DST, daddr)) | |
223 | return 0; | |
224 | } | |
225 | ||
226 | if (family == AF_INET6) { | |
227 | const struct in6_addr *saddr6 = &info->key.u.ipv6.src; | |
228 | const struct in6_addr *daddr6 = &info->key.u.ipv6.dst; | |
229 | ||
230 | if (!nla_put_in6_addr(skb, | |
231 | TCA_TUNNEL_KEY_ENC_IPV6_SRC, saddr6) && | |
232 | !nla_put_in6_addr(skb, | |
233 | TCA_TUNNEL_KEY_ENC_IPV6_DST, daddr6)) | |
234 | return 0; | |
235 | } | |
236 | ||
237 | return -EINVAL; | |
238 | } | |
239 | ||
240 | static int tunnel_key_dump(struct sk_buff *skb, struct tc_action *a, | |
241 | int bind, int ref) | |
242 | { | |
243 | unsigned char *b = skb_tail_pointer(skb); | |
244 | struct tcf_tunnel_key *t = to_tunnel_key(a); | |
245 | struct tcf_tunnel_key_params *params; | |
246 | struct tc_tunnel_key opt = { | |
247 | .index = t->tcf_index, | |
248 | .refcnt = t->tcf_refcnt - ref, | |
249 | .bindcnt = t->tcf_bindcnt - bind, | |
250 | }; | |
251 | struct tcf_t tm; | |
d0f6dd8a | 252 | |
07c0f09e | 253 | params = rtnl_dereference(t->params); |
d0f6dd8a AV |
254 | |
255 | opt.t_action = params->tcft_action; | |
256 | opt.action = params->action; | |
257 | ||
258 | if (nla_put(skb, TCA_TUNNEL_KEY_PARMS, sizeof(opt), &opt)) | |
259 | goto nla_put_failure; | |
260 | ||
261 | if (params->tcft_action == TCA_TUNNEL_KEY_ACT_SET) { | |
262 | struct ip_tunnel_key *key = | |
263 | ¶ms->tcft_enc_metadata->u.tun_info.key; | |
264 | __be32 key_id = tunnel_id_to_key32(key->tun_id); | |
265 | ||
266 | if (nla_put_be32(skb, TCA_TUNNEL_KEY_ENC_KEY_ID, key_id) || | |
267 | tunnel_key_dump_addresses(skb, | |
75bfbca0 HHZ |
268 | ¶ms->tcft_enc_metadata->u.tun_info) || |
269 | nla_put_be16(skb, TCA_TUNNEL_KEY_ENC_DST_PORT, key->tp_dst)) | |
d0f6dd8a AV |
270 | goto nla_put_failure; |
271 | } | |
272 | ||
273 | tcf_tm_dump(&tm, &t->tcf_tm); | |
274 | if (nla_put_64bit(skb, TCA_TUNNEL_KEY_TM, sizeof(tm), | |
275 | &tm, TCA_TUNNEL_KEY_PAD)) | |
276 | goto nla_put_failure; | |
277 | ||
07c0f09e | 278 | return skb->len; |
d0f6dd8a AV |
279 | |
280 | nla_put_failure: | |
281 | nlmsg_trim(skb, b); | |
07c0f09e | 282 | return -1; |
d0f6dd8a AV |
283 | } |
284 | ||
285 | static int tunnel_key_walker(struct net *net, struct sk_buff *skb, | |
286 | struct netlink_callback *cb, int type, | |
287 | const struct tc_action_ops *ops) | |
288 | { | |
289 | struct tc_action_net *tn = net_generic(net, tunnel_key_net_id); | |
290 | ||
291 | return tcf_generic_walker(tn, skb, cb, type, ops); | |
292 | } | |
293 | ||
294 | static int tunnel_key_search(struct net *net, struct tc_action **a, u32 index) | |
295 | { | |
296 | struct tc_action_net *tn = net_generic(net, tunnel_key_net_id); | |
297 | ||
298 | return tcf_hash_search(tn, a, index); | |
299 | } | |
300 | ||
301 | static struct tc_action_ops act_tunnel_key_ops = { | |
302 | .kind = "tunnel_key", | |
303 | .type = TCA_ACT_TUNNEL_KEY, | |
304 | .owner = THIS_MODULE, | |
305 | .act = tunnel_key_act, | |
306 | .dump = tunnel_key_dump, | |
307 | .init = tunnel_key_init, | |
308 | .cleanup = tunnel_key_release, | |
309 | .walk = tunnel_key_walker, | |
310 | .lookup = tunnel_key_search, | |
311 | .size = sizeof(struct tcf_tunnel_key), | |
312 | }; | |
313 | ||
314 | static __net_init int tunnel_key_init_net(struct net *net) | |
315 | { | |
316 | struct tc_action_net *tn = net_generic(net, tunnel_key_net_id); | |
317 | ||
318 | return tc_action_net_init(tn, &act_tunnel_key_ops, TUNNEL_KEY_TAB_MASK); | |
319 | } | |
320 | ||
321 | static void __net_exit tunnel_key_exit_net(struct net *net) | |
322 | { | |
323 | struct tc_action_net *tn = net_generic(net, tunnel_key_net_id); | |
324 | ||
325 | tc_action_net_exit(tn); | |
326 | } | |
327 | ||
328 | static struct pernet_operations tunnel_key_net_ops = { | |
329 | .init = tunnel_key_init_net, | |
330 | .exit = tunnel_key_exit_net, | |
331 | .id = &tunnel_key_net_id, | |
332 | .size = sizeof(struct tc_action_net), | |
333 | }; | |
334 | ||
335 | static int __init tunnel_key_init_module(void) | |
336 | { | |
337 | return tcf_register_action(&act_tunnel_key_ops, &tunnel_key_net_ops); | |
338 | } | |
339 | ||
340 | static void __exit tunnel_key_cleanup_module(void) | |
341 | { | |
342 | tcf_unregister_action(&act_tunnel_key_ops, &tunnel_key_net_ops); | |
343 | } | |
344 | ||
345 | module_init(tunnel_key_init_module); | |
346 | module_exit(tunnel_key_cleanup_module); | |
347 | ||
348 | MODULE_AUTHOR("Amir Vadai <amir@vadai.me>"); | |
349 | MODULE_DESCRIPTION("ip tunnel manipulation actions"); | |
350 | MODULE_LICENSE("GPL v2"); |