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Amir Vadaid0f6dd82016-09-08 16:23:48 +03001/*
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>
Amir Vadaid0f6dd82016-09-08 16:23:48 +030019
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
Alexey Dobriyanc7d03a02016-11-17 04:58:21 +030025static unsigned int tunnel_key_net_id;
Amir Vadaid0f6dd82016-09-08 16:23:48 +030026static struct tc_action_ops act_tunnel_key_ops;
27
28static 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(&params->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
62static 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 },
Hadar Hen Zion75bfbca2016-11-07 15:14:41 +020069 [TCA_TUNNEL_KEY_ENC_DST_PORT] = {.type = NLA_U16},
Amir Vadaid0f6dd82016-09-08 16:23:48 +030070};
71
72static 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;
Hadar Hen Zion75bfbca2016-11-07 15:14:41 +020084 __be16 dst_port = 0;
Amir Vadaid0f6dd82016-09-08 16:23:48 +030085 __be64 key_id;
86 int ret = 0;
87 int err;
88
89 if (!nla)
90 return -EINVAL;
91
Johannes Bergfceb6432017-04-12 14:34:07 +020092 err = nla_parse_nested(tb, TCA_TUNNEL_KEY_MAX, nla, tunnel_key_policy,
93 NULL);
Amir Vadaid0f6dd82016-09-08 16:23:48 +030094 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
Hadar Hen Zion75bfbca2016-11-07 15:14:41 +0200116 if (tb[TCA_TUNNEL_KEY_ENC_DST_PORT])
117 dst_port = nla_get_be16(tb[TCA_TUNNEL_KEY_ENC_DST_PORT]);
118
Amir Vadaid0f6dd82016-09-08 16:23:48 +0300119 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,
Hadar Hen Zion75bfbca2016-11-07 15:14:41 +0200128 dst_port, TUNNEL_KEY,
129 key_id, 0);
Amir Vadaid0f6dd82016-09-08 16:23:48 +0300130 } 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
Or Gerlitzdc594ec2016-12-22 14:28:14 +0200138 metadata = __ipv6_tun_set_dst(&saddr, &daddr, 0, 0, dst_port,
139 0, TUNNEL_KEY,
Hadar Hen Zion75bfbca2016-11-07 15:14:41 +0200140 key_id, 0);
Amir Vadaid0f6dd82016-09-08 16:23:48 +0300141 }
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
193err_out:
194 if (exists)
195 tcf_hash_release(*a, bind);
196 return ret;
197}
198
199static 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
Hadar Hen Zion07c0f092016-09-12 15:19:21 +0300204 params = rcu_dereference_protected(t->params, 1);
Amir Vadaid0f6dd82016-09-08 16:23:48 +0300205
206 if (params->tcft_action == TCA_TUNNEL_KEY_ACT_SET)
207 dst_release(&params->tcft_enc_metadata->dst);
208
209 kfree_rcu(params, rcu);
Amir Vadaid0f6dd82016-09-08 16:23:48 +0300210}
211
212static 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
240static 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;
Amir Vadaid0f6dd82016-09-08 16:23:48 +0300252
Hadar Hen Zion07c0f092016-09-12 15:19:21 +0300253 params = rtnl_dereference(t->params);
Amir Vadaid0f6dd82016-09-08 16:23:48 +0300254
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 &params->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,
Hadar Hen Zion75bfbca2016-11-07 15:14:41 +0200268 &params->tcft_enc_metadata->u.tun_info) ||
269 nla_put_be16(skb, TCA_TUNNEL_KEY_ENC_DST_PORT, key->tp_dst))
Amir Vadaid0f6dd82016-09-08 16:23:48 +0300270 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
Hadar Hen Zion07c0f092016-09-12 15:19:21 +0300278 return skb->len;
Amir Vadaid0f6dd82016-09-08 16:23:48 +0300279
280nla_put_failure:
281 nlmsg_trim(skb, b);
Hadar Hen Zion07c0f092016-09-12 15:19:21 +0300282 return -1;
Amir Vadaid0f6dd82016-09-08 16:23:48 +0300283}
284
285static 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
294static 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
301static 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
314static __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
321static 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
328static 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
335static int __init tunnel_key_init_module(void)
336{
337 return tcf_register_action(&act_tunnel_key_ops, &tunnel_key_net_ops);
338}
339
340static void __exit tunnel_key_cleanup_module(void)
341{
342 tcf_unregister_action(&act_tunnel_key_ops, &tunnel_key_net_ops);
343}
344
345module_init(tunnel_key_init_module);
346module_exit(tunnel_key_cleanup_module);
347
348MODULE_AUTHOR("Amir Vadai <amir@vadai.me>");
349MODULE_DESCRIPTION("ip tunnel manipulation actions");
350MODULE_LICENSE("GPL v2");