xref: /openbmc/linux/net/sched/act_tunnel_key.c (revision 93032e31)
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(&params->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 	params = rcu_dereference_protected(t->params, 1);
198 
199 	if (params->tcft_action == TCA_TUNNEL_KEY_ACT_SET)
200 		dst_release(&params->tcft_enc_metadata->dst);
201 
202 	kfree_rcu(params, rcu);
203 }
204 
205 static int tunnel_key_dump_addresses(struct sk_buff *skb,
206 				     const struct ip_tunnel_info *info)
207 {
208 	unsigned short family = ip_tunnel_info_af(info);
209 
210 	if (family == AF_INET) {
211 		__be32 saddr = info->key.u.ipv4.src;
212 		__be32 daddr = info->key.u.ipv4.dst;
213 
214 		if (!nla_put_in_addr(skb, TCA_TUNNEL_KEY_ENC_IPV4_SRC, saddr) &&
215 		    !nla_put_in_addr(skb, TCA_TUNNEL_KEY_ENC_IPV4_DST, daddr))
216 			return 0;
217 	}
218 
219 	if (family == AF_INET6) {
220 		const struct in6_addr *saddr6 = &info->key.u.ipv6.src;
221 		const struct in6_addr *daddr6 = &info->key.u.ipv6.dst;
222 
223 		if (!nla_put_in6_addr(skb,
224 				      TCA_TUNNEL_KEY_ENC_IPV6_SRC, saddr6) &&
225 		    !nla_put_in6_addr(skb,
226 				      TCA_TUNNEL_KEY_ENC_IPV6_DST, daddr6))
227 			return 0;
228 	}
229 
230 	return -EINVAL;
231 }
232 
233 static int tunnel_key_dump(struct sk_buff *skb, struct tc_action *a,
234 			   int bind, int ref)
235 {
236 	unsigned char *b = skb_tail_pointer(skb);
237 	struct tcf_tunnel_key *t = to_tunnel_key(a);
238 	struct tcf_tunnel_key_params *params;
239 	struct tc_tunnel_key opt = {
240 		.index    = t->tcf_index,
241 		.refcnt   = t->tcf_refcnt - ref,
242 		.bindcnt  = t->tcf_bindcnt - bind,
243 	};
244 	struct tcf_t tm;
245 
246 	params = rtnl_dereference(t->params);
247 
248 	opt.t_action = params->tcft_action;
249 	opt.action = params->action;
250 
251 	if (nla_put(skb, TCA_TUNNEL_KEY_PARMS, sizeof(opt), &opt))
252 		goto nla_put_failure;
253 
254 	if (params->tcft_action == TCA_TUNNEL_KEY_ACT_SET) {
255 		struct ip_tunnel_key *key =
256 			&params->tcft_enc_metadata->u.tun_info.key;
257 		__be32 key_id = tunnel_id_to_key32(key->tun_id);
258 
259 		if (nla_put_be32(skb, TCA_TUNNEL_KEY_ENC_KEY_ID, key_id) ||
260 		    tunnel_key_dump_addresses(skb,
261 					      &params->tcft_enc_metadata->u.tun_info))
262 			goto nla_put_failure;
263 	}
264 
265 	tcf_tm_dump(&tm, &t->tcf_tm);
266 	if (nla_put_64bit(skb, TCA_TUNNEL_KEY_TM, sizeof(tm),
267 			  &tm, TCA_TUNNEL_KEY_PAD))
268 		goto nla_put_failure;
269 
270 	return skb->len;
271 
272 nla_put_failure:
273 	nlmsg_trim(skb, b);
274 	return -1;
275 }
276 
277 static int tunnel_key_walker(struct net *net, struct sk_buff *skb,
278 			     struct netlink_callback *cb, int type,
279 			     const struct tc_action_ops *ops)
280 {
281 	struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
282 
283 	return tcf_generic_walker(tn, skb, cb, type, ops);
284 }
285 
286 static int tunnel_key_search(struct net *net, struct tc_action **a, u32 index)
287 {
288 	struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
289 
290 	return tcf_hash_search(tn, a, index);
291 }
292 
293 static struct tc_action_ops act_tunnel_key_ops = {
294 	.kind		=	"tunnel_key",
295 	.type		=	TCA_ACT_TUNNEL_KEY,
296 	.owner		=	THIS_MODULE,
297 	.act		=	tunnel_key_act,
298 	.dump		=	tunnel_key_dump,
299 	.init		=	tunnel_key_init,
300 	.cleanup	=	tunnel_key_release,
301 	.walk		=	tunnel_key_walker,
302 	.lookup		=	tunnel_key_search,
303 	.size		=	sizeof(struct tcf_tunnel_key),
304 };
305 
306 static __net_init int tunnel_key_init_net(struct net *net)
307 {
308 	struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
309 
310 	return tc_action_net_init(tn, &act_tunnel_key_ops, TUNNEL_KEY_TAB_MASK);
311 }
312 
313 static void __net_exit tunnel_key_exit_net(struct net *net)
314 {
315 	struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
316 
317 	tc_action_net_exit(tn);
318 }
319 
320 static struct pernet_operations tunnel_key_net_ops = {
321 	.init = tunnel_key_init_net,
322 	.exit = tunnel_key_exit_net,
323 	.id   = &tunnel_key_net_id,
324 	.size = sizeof(struct tc_action_net),
325 };
326 
327 static int __init tunnel_key_init_module(void)
328 {
329 	return tcf_register_action(&act_tunnel_key_ops, &tunnel_key_net_ops);
330 }
331 
332 static void __exit tunnel_key_cleanup_module(void)
333 {
334 	tcf_unregister_action(&act_tunnel_key_ops, &tunnel_key_net_ops);
335 }
336 
337 module_init(tunnel_key_init_module);
338 module_exit(tunnel_key_cleanup_module);
339 
340 MODULE_AUTHOR("Amir Vadai <amir@vadai.me>");
341 MODULE_DESCRIPTION("ip tunnel manipulation actions");
342 MODULE_LICENSE("GPL v2");
343