blob: e3a58e02119877d237f9aa18c5f9d9fdfb44d0c9 [file] [log] [blame]
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
92 err = nla_parse_nested(tb, TCA_TUNNEL_KEY_MAX, nla, tunnel_key_policy);
93 if (err < 0)
94 return err;
95
96 if (!tb[TCA_TUNNEL_KEY_PARMS])
97 return -EINVAL;
98
99 parm = nla_data(tb[TCA_TUNNEL_KEY_PARMS]);
100 exists = tcf_hash_check(tn, parm->index, a, bind);
101 if (exists && bind)
102 return 0;
103
104 switch (parm->t_action) {
105 case TCA_TUNNEL_KEY_ACT_RELEASE:
106 break;
107 case TCA_TUNNEL_KEY_ACT_SET:
108 if (!tb[TCA_TUNNEL_KEY_ENC_KEY_ID]) {
109 ret = -EINVAL;
110 goto err_out;
111 }
112
113 key_id = key32_to_tunnel_id(nla_get_be32(tb[TCA_TUNNEL_KEY_ENC_KEY_ID]));
114
Hadar Hen Zion75bfbca2016-11-07 15:14:41 +0200115 if (tb[TCA_TUNNEL_KEY_ENC_DST_PORT])
116 dst_port = nla_get_be16(tb[TCA_TUNNEL_KEY_ENC_DST_PORT]);
117
Amir Vadaid0f6dd82016-09-08 16:23:48 +0300118 if (tb[TCA_TUNNEL_KEY_ENC_IPV4_SRC] &&
119 tb[TCA_TUNNEL_KEY_ENC_IPV4_DST]) {
120 __be32 saddr;
121 __be32 daddr;
122
123 saddr = nla_get_in_addr(tb[TCA_TUNNEL_KEY_ENC_IPV4_SRC]);
124 daddr = nla_get_in_addr(tb[TCA_TUNNEL_KEY_ENC_IPV4_DST]);
125
126 metadata = __ip_tun_set_dst(saddr, daddr, 0, 0,
Hadar Hen Zion75bfbca2016-11-07 15:14:41 +0200127 dst_port, TUNNEL_KEY,
128 key_id, 0);
Amir Vadaid0f6dd82016-09-08 16:23:48 +0300129 } else if (tb[TCA_TUNNEL_KEY_ENC_IPV6_SRC] &&
130 tb[TCA_TUNNEL_KEY_ENC_IPV6_DST]) {
131 struct in6_addr saddr;
132 struct in6_addr daddr;
133
134 saddr = nla_get_in6_addr(tb[TCA_TUNNEL_KEY_ENC_IPV6_SRC]);
135 daddr = nla_get_in6_addr(tb[TCA_TUNNEL_KEY_ENC_IPV6_DST]);
136
Or Gerlitzdc594ec2016-12-22 14:28:14 +0200137 metadata = __ipv6_tun_set_dst(&saddr, &daddr, 0, 0, dst_port,
138 0, TUNNEL_KEY,
Hadar Hen Zion75bfbca2016-11-07 15:14:41 +0200139 key_id, 0);
Amir Vadaid0f6dd82016-09-08 16:23:48 +0300140 }
141
142 if (!metadata) {
143 ret = -EINVAL;
144 goto err_out;
145 }
146
147 metadata->u.tun_info.mode |= IP_TUNNEL_INFO_TX;
148 break;
149 default:
150 goto err_out;
151 }
152
153 if (!exists) {
154 ret = tcf_hash_create(tn, parm->index, est, a,
155 &act_tunnel_key_ops, bind, true);
156 if (ret)
157 return ret;
158
159 ret = ACT_P_CREATED;
160 } else {
161 tcf_hash_release(*a, bind);
162 if (!ovr)
163 return -EEXIST;
164 }
165
166 t = to_tunnel_key(*a);
167
168 ASSERT_RTNL();
169 params_new = kzalloc(sizeof(*params_new), GFP_KERNEL);
170 if (unlikely(!params_new)) {
171 if (ret == ACT_P_CREATED)
172 tcf_hash_release(*a, bind);
173 return -ENOMEM;
174 }
175
176 params_old = rtnl_dereference(t->params);
177
178 params_new->action = parm->action;
179 params_new->tcft_action = parm->t_action;
180 params_new->tcft_enc_metadata = metadata;
181
182 rcu_assign_pointer(t->params, params_new);
183
184 if (params_old)
185 kfree_rcu(params_old, rcu);
186
187 if (ret == ACT_P_CREATED)
188 tcf_hash_insert(tn, *a);
189
190 return ret;
191
192err_out:
193 if (exists)
194 tcf_hash_release(*a, bind);
195 return ret;
196}
197
198static void tunnel_key_release(struct tc_action *a, int bind)
199{
200 struct tcf_tunnel_key *t = to_tunnel_key(a);
201 struct tcf_tunnel_key_params *params;
202
Hadar Hen Zion07c0f092016-09-12 15:19:21 +0300203 params = rcu_dereference_protected(t->params, 1);
Amir Vadaid0f6dd82016-09-08 16:23:48 +0300204
205 if (params->tcft_action == TCA_TUNNEL_KEY_ACT_SET)
206 dst_release(&params->tcft_enc_metadata->dst);
207
208 kfree_rcu(params, rcu);
Amir Vadaid0f6dd82016-09-08 16:23:48 +0300209}
210
211static int tunnel_key_dump_addresses(struct sk_buff *skb,
212 const struct ip_tunnel_info *info)
213{
214 unsigned short family = ip_tunnel_info_af(info);
215
216 if (family == AF_INET) {
217 __be32 saddr = info->key.u.ipv4.src;
218 __be32 daddr = info->key.u.ipv4.dst;
219
220 if (!nla_put_in_addr(skb, TCA_TUNNEL_KEY_ENC_IPV4_SRC, saddr) &&
221 !nla_put_in_addr(skb, TCA_TUNNEL_KEY_ENC_IPV4_DST, daddr))
222 return 0;
223 }
224
225 if (family == AF_INET6) {
226 const struct in6_addr *saddr6 = &info->key.u.ipv6.src;
227 const struct in6_addr *daddr6 = &info->key.u.ipv6.dst;
228
229 if (!nla_put_in6_addr(skb,
230 TCA_TUNNEL_KEY_ENC_IPV6_SRC, saddr6) &&
231 !nla_put_in6_addr(skb,
232 TCA_TUNNEL_KEY_ENC_IPV6_DST, daddr6))
233 return 0;
234 }
235
236 return -EINVAL;
237}
238
239static int tunnel_key_dump(struct sk_buff *skb, struct tc_action *a,
240 int bind, int ref)
241{
242 unsigned char *b = skb_tail_pointer(skb);
243 struct tcf_tunnel_key *t = to_tunnel_key(a);
244 struct tcf_tunnel_key_params *params;
245 struct tc_tunnel_key opt = {
246 .index = t->tcf_index,
247 .refcnt = t->tcf_refcnt - ref,
248 .bindcnt = t->tcf_bindcnt - bind,
249 };
250 struct tcf_t tm;
Amir Vadaid0f6dd82016-09-08 16:23:48 +0300251
Hadar Hen Zion07c0f092016-09-12 15:19:21 +0300252 params = rtnl_dereference(t->params);
Amir Vadaid0f6dd82016-09-08 16:23:48 +0300253
254 opt.t_action = params->tcft_action;
255 opt.action = params->action;
256
257 if (nla_put(skb, TCA_TUNNEL_KEY_PARMS, sizeof(opt), &opt))
258 goto nla_put_failure;
259
260 if (params->tcft_action == TCA_TUNNEL_KEY_ACT_SET) {
261 struct ip_tunnel_key *key =
262 &params->tcft_enc_metadata->u.tun_info.key;
263 __be32 key_id = tunnel_id_to_key32(key->tun_id);
264
265 if (nla_put_be32(skb, TCA_TUNNEL_KEY_ENC_KEY_ID, key_id) ||
266 tunnel_key_dump_addresses(skb,
Hadar Hen Zion75bfbca2016-11-07 15:14:41 +0200267 &params->tcft_enc_metadata->u.tun_info) ||
268 nla_put_be16(skb, TCA_TUNNEL_KEY_ENC_DST_PORT, key->tp_dst))
Amir Vadaid0f6dd82016-09-08 16:23:48 +0300269 goto nla_put_failure;
270 }
271
272 tcf_tm_dump(&tm, &t->tcf_tm);
273 if (nla_put_64bit(skb, TCA_TUNNEL_KEY_TM, sizeof(tm),
274 &tm, TCA_TUNNEL_KEY_PAD))
275 goto nla_put_failure;
276
Hadar Hen Zion07c0f092016-09-12 15:19:21 +0300277 return skb->len;
Amir Vadaid0f6dd82016-09-08 16:23:48 +0300278
279nla_put_failure:
280 nlmsg_trim(skb, b);
Hadar Hen Zion07c0f092016-09-12 15:19:21 +0300281 return -1;
Amir Vadaid0f6dd82016-09-08 16:23:48 +0300282}
283
284static int tunnel_key_walker(struct net *net, struct sk_buff *skb,
285 struct netlink_callback *cb, int type,
286 const struct tc_action_ops *ops)
287{
288 struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
289
290 return tcf_generic_walker(tn, skb, cb, type, ops);
291}
292
293static int tunnel_key_search(struct net *net, struct tc_action **a, u32 index)
294{
295 struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
296
297 return tcf_hash_search(tn, a, index);
298}
299
300static struct tc_action_ops act_tunnel_key_ops = {
301 .kind = "tunnel_key",
302 .type = TCA_ACT_TUNNEL_KEY,
303 .owner = THIS_MODULE,
304 .act = tunnel_key_act,
305 .dump = tunnel_key_dump,
306 .init = tunnel_key_init,
307 .cleanup = tunnel_key_release,
308 .walk = tunnel_key_walker,
309 .lookup = tunnel_key_search,
310 .size = sizeof(struct tcf_tunnel_key),
311};
312
313static __net_init int tunnel_key_init_net(struct net *net)
314{
315 struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
316
317 return tc_action_net_init(tn, &act_tunnel_key_ops, TUNNEL_KEY_TAB_MASK);
318}
319
320static void __net_exit tunnel_key_exit_net(struct net *net)
321{
322 struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
323
324 tc_action_net_exit(tn);
325}
326
327static struct pernet_operations tunnel_key_net_ops = {
328 .init = tunnel_key_init_net,
329 .exit = tunnel_key_exit_net,
330 .id = &tunnel_key_net_id,
331 .size = sizeof(struct tc_action_net),
332};
333
334static int __init tunnel_key_init_module(void)
335{
336 return tcf_register_action(&act_tunnel_key_ops, &tunnel_key_net_ops);
337}
338
339static void __exit tunnel_key_cleanup_module(void)
340{
341 tcf_unregister_action(&act_tunnel_key_ops, &tunnel_key_net_ops);
342}
343
344module_init(tunnel_key_init_module);
345module_exit(tunnel_key_cleanup_module);
346
347MODULE_AUTHOR("Amir Vadai <amir@vadai.me>");
348MODULE_DESCRIPTION("ip tunnel manipulation actions");
349MODULE_LICENSE("GPL v2");