2 * Copyright (c) 2016, Amir Vadai <amir@vadai.me>
3 * Copyright (c) 2016, Mellanox Technologies. All rights reserved.
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.
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>
20 #include <linux/tc_act/tc_tunnel_key.h>
21 #include <net/tc_act/tc_tunnel_key.h>
23 static unsigned int tunnel_key_net_id;
24 static struct tc_action_ops act_tunnel_key_ops;
26 static int tunnel_key_act(struct sk_buff *skb, const struct tc_action *a,
27 struct tcf_result *res)
29 struct tcf_tunnel_key *t = to_tunnel_key(a);
30 struct tcf_tunnel_key_params *params;
35 params = rcu_dereference(t->params);
37 tcf_lastuse_update(&t->tcf_tm);
38 bstats_cpu_update(this_cpu_ptr(t->common.cpu_bstats), skb);
39 action = params->action;
41 switch (params->tcft_action) {
42 case TCA_TUNNEL_KEY_ACT_RELEASE:
45 case TCA_TUNNEL_KEY_ACT_SET:
47 skb_dst_set(skb, dst_clone(¶ms->tcft_enc_metadata->dst));
50 WARN_ONCE(1, "Bad tunnel_key action %d.\n",
60 static const struct nla_policy tunnel_key_policy[TCA_TUNNEL_KEY_MAX + 1] = {
61 [TCA_TUNNEL_KEY_PARMS] = { .len = sizeof(struct tc_tunnel_key) },
62 [TCA_TUNNEL_KEY_ENC_IPV4_SRC] = { .type = NLA_U32 },
63 [TCA_TUNNEL_KEY_ENC_IPV4_DST] = { .type = NLA_U32 },
64 [TCA_TUNNEL_KEY_ENC_IPV6_SRC] = { .len = sizeof(struct in6_addr) },
65 [TCA_TUNNEL_KEY_ENC_IPV6_DST] = { .len = sizeof(struct in6_addr) },
66 [TCA_TUNNEL_KEY_ENC_KEY_ID] = { .type = NLA_U32 },
67 [TCA_TUNNEL_KEY_ENC_DST_PORT] = {.type = NLA_U16},
68 [TCA_TUNNEL_KEY_NO_CSUM] = { .type = NLA_U8 },
71 static int tunnel_key_init(struct net *net, struct nlattr *nla,
72 struct nlattr *est, struct tc_action **a,
73 int ovr, int bind, struct netlink_ext_ack *extack)
75 struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
76 struct nlattr *tb[TCA_TUNNEL_KEY_MAX + 1];
77 struct tcf_tunnel_key_params *params_old;
78 struct tcf_tunnel_key_params *params_new;
79 struct metadata_dst *metadata = NULL;
80 struct tc_tunnel_key *parm;
81 struct tcf_tunnel_key *t;
92 err = nla_parse_nested(tb, TCA_TUNNEL_KEY_MAX, nla, tunnel_key_policy,
97 if (!tb[TCA_TUNNEL_KEY_PARMS])
100 parm = nla_data(tb[TCA_TUNNEL_KEY_PARMS]);
101 exists = tcf_idr_check(tn, parm->index, a, bind);
105 switch (parm->t_action) {
106 case TCA_TUNNEL_KEY_ACT_RELEASE:
108 case TCA_TUNNEL_KEY_ACT_SET:
109 if (!tb[TCA_TUNNEL_KEY_ENC_KEY_ID]) {
114 key_id = key32_to_tunnel_id(nla_get_be32(tb[TCA_TUNNEL_KEY_ENC_KEY_ID]));
116 flags = TUNNEL_KEY | TUNNEL_CSUM;
117 if (tb[TCA_TUNNEL_KEY_NO_CSUM] &&
118 nla_get_u8(tb[TCA_TUNNEL_KEY_NO_CSUM]))
119 flags &= ~TUNNEL_CSUM;
121 if (tb[TCA_TUNNEL_KEY_ENC_DST_PORT])
122 dst_port = nla_get_be16(tb[TCA_TUNNEL_KEY_ENC_DST_PORT]);
124 if (tb[TCA_TUNNEL_KEY_ENC_IPV4_SRC] &&
125 tb[TCA_TUNNEL_KEY_ENC_IPV4_DST]) {
129 saddr = nla_get_in_addr(tb[TCA_TUNNEL_KEY_ENC_IPV4_SRC]);
130 daddr = nla_get_in_addr(tb[TCA_TUNNEL_KEY_ENC_IPV4_DST]);
132 metadata = __ip_tun_set_dst(saddr, daddr, 0, 0,
135 } else if (tb[TCA_TUNNEL_KEY_ENC_IPV6_SRC] &&
136 tb[TCA_TUNNEL_KEY_ENC_IPV6_DST]) {
137 struct in6_addr saddr;
138 struct in6_addr daddr;
140 saddr = nla_get_in6_addr(tb[TCA_TUNNEL_KEY_ENC_IPV6_SRC]);
141 daddr = nla_get_in6_addr(tb[TCA_TUNNEL_KEY_ENC_IPV6_DST]);
143 metadata = __ipv6_tun_set_dst(&saddr, &daddr, 0, 0, dst_port,
153 metadata->u.tun_info.mode |= IP_TUNNEL_INFO_TX;
161 ret = tcf_idr_create(tn, parm->index, est, a,
162 &act_tunnel_key_ops, bind, true);
168 tcf_idr_release(*a, bind);
173 t = to_tunnel_key(*a);
176 params_new = kzalloc(sizeof(*params_new), GFP_KERNEL);
177 if (unlikely(!params_new)) {
178 if (ret == ACT_P_CREATED)
179 tcf_idr_release(*a, bind);
183 params_old = rtnl_dereference(t->params);
185 params_new->action = parm->action;
186 params_new->tcft_action = parm->t_action;
187 params_new->tcft_enc_metadata = metadata;
189 rcu_assign_pointer(t->params, params_new);
192 kfree_rcu(params_old, rcu);
194 if (ret == ACT_P_CREATED)
195 tcf_idr_insert(tn, *a);
201 tcf_idr_release(*a, bind);
205 static void tunnel_key_release(struct tc_action *a)
207 struct tcf_tunnel_key *t = to_tunnel_key(a);
208 struct tcf_tunnel_key_params *params;
210 params = rcu_dereference_protected(t->params, 1);
212 if (params->tcft_action == TCA_TUNNEL_KEY_ACT_SET)
213 dst_release(¶ms->tcft_enc_metadata->dst);
215 kfree_rcu(params, rcu);
219 static int tunnel_key_dump_addresses(struct sk_buff *skb,
220 const struct ip_tunnel_info *info)
222 unsigned short family = ip_tunnel_info_af(info);
224 if (family == AF_INET) {
225 __be32 saddr = info->key.u.ipv4.src;
226 __be32 daddr = info->key.u.ipv4.dst;
228 if (!nla_put_in_addr(skb, TCA_TUNNEL_KEY_ENC_IPV4_SRC, saddr) &&
229 !nla_put_in_addr(skb, TCA_TUNNEL_KEY_ENC_IPV4_DST, daddr))
233 if (family == AF_INET6) {
234 const struct in6_addr *saddr6 = &info->key.u.ipv6.src;
235 const struct in6_addr *daddr6 = &info->key.u.ipv6.dst;
237 if (!nla_put_in6_addr(skb,
238 TCA_TUNNEL_KEY_ENC_IPV6_SRC, saddr6) &&
239 !nla_put_in6_addr(skb,
240 TCA_TUNNEL_KEY_ENC_IPV6_DST, daddr6))
247 static int tunnel_key_dump(struct sk_buff *skb, struct tc_action *a,
250 unsigned char *b = skb_tail_pointer(skb);
251 struct tcf_tunnel_key *t = to_tunnel_key(a);
252 struct tcf_tunnel_key_params *params;
253 struct tc_tunnel_key opt = {
254 .index = t->tcf_index,
255 .refcnt = t->tcf_refcnt - ref,
256 .bindcnt = t->tcf_bindcnt - bind,
260 params = rtnl_dereference(t->params);
262 opt.t_action = params->tcft_action;
263 opt.action = params->action;
265 if (nla_put(skb, TCA_TUNNEL_KEY_PARMS, sizeof(opt), &opt))
266 goto nla_put_failure;
268 if (params->tcft_action == TCA_TUNNEL_KEY_ACT_SET) {
269 struct ip_tunnel_key *key =
270 ¶ms->tcft_enc_metadata->u.tun_info.key;
271 __be32 key_id = tunnel_id_to_key32(key->tun_id);
273 if (nla_put_be32(skb, TCA_TUNNEL_KEY_ENC_KEY_ID, key_id) ||
274 tunnel_key_dump_addresses(skb,
275 ¶ms->tcft_enc_metadata->u.tun_info) ||
276 nla_put_be16(skb, TCA_TUNNEL_KEY_ENC_DST_PORT, key->tp_dst) ||
277 nla_put_u8(skb, TCA_TUNNEL_KEY_NO_CSUM,
278 !(key->tun_flags & TUNNEL_CSUM)))
279 goto nla_put_failure;
282 tcf_tm_dump(&tm, &t->tcf_tm);
283 if (nla_put_64bit(skb, TCA_TUNNEL_KEY_TM, sizeof(tm),
284 &tm, TCA_TUNNEL_KEY_PAD))
285 goto nla_put_failure;
294 static int tunnel_key_walker(struct net *net, struct sk_buff *skb,
295 struct netlink_callback *cb, int type,
296 const struct tc_action_ops *ops,
297 struct netlink_ext_ack *extack)
299 struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
301 return tcf_generic_walker(tn, skb, cb, type, ops, extack);
304 static int tunnel_key_search(struct net *net, struct tc_action **a, u32 index,
305 struct netlink_ext_ack *extack)
307 struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
309 return tcf_idr_search(tn, a, index);
312 static struct tc_action_ops act_tunnel_key_ops = {
313 .kind = "tunnel_key",
314 .type = TCA_ACT_TUNNEL_KEY,
315 .owner = THIS_MODULE,
316 .act = tunnel_key_act,
317 .dump = tunnel_key_dump,
318 .init = tunnel_key_init,
319 .cleanup = tunnel_key_release,
320 .walk = tunnel_key_walker,
321 .lookup = tunnel_key_search,
322 .size = sizeof(struct tcf_tunnel_key),
325 static __net_init int tunnel_key_init_net(struct net *net)
327 struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
329 return tc_action_net_init(tn, &act_tunnel_key_ops);
332 static void __net_exit tunnel_key_exit_net(struct list_head *net_list)
334 tc_action_net_exit(net_list, tunnel_key_net_id);
337 static struct pernet_operations tunnel_key_net_ops = {
338 .init = tunnel_key_init_net,
339 .exit_batch = tunnel_key_exit_net,
340 .id = &tunnel_key_net_id,
341 .size = sizeof(struct tc_action_net),
344 static int __init tunnel_key_init_module(void)
346 return tcf_register_action(&act_tunnel_key_ops, &tunnel_key_net_ops);
349 static void __exit tunnel_key_cleanup_module(void)
351 tcf_unregister_action(&act_tunnel_key_ops, &tunnel_key_net_ops);
354 module_init(tunnel_key_init_module);
355 module_exit(tunnel_key_cleanup_module);
357 MODULE_AUTHOR("Amir Vadai <amir@vadai.me>");
358 MODULE_DESCRIPTION("ip tunnel manipulation actions");
359 MODULE_LICENSE("GPL v2");