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