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 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 25 static unsigned int tunnel_key_net_id; 26 static struct tc_action_ops act_tunnel_key_ops; 27 28 static 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(¶ms->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 62 static 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 }, 69 [TCA_TUNNEL_KEY_ENC_DST_PORT] = {.type = NLA_U16}, 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 __be16 dst_port = 0; 85 __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])); 114 115 if (tb[TCA_TUNNEL_KEY_ENC_DST_PORT]) 116 dst_port = nla_get_be16(tb[TCA_TUNNEL_KEY_ENC_DST_PORT]); 117 118 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, 127 dst_port, TUNNEL_KEY, 128 key_id, 0); 129 } 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]); 136 137 metadata = __ipv6_tun_set_dst(&saddr, &daddr, 0, 0, dst_port, 138 0, TUNNEL_KEY, 139 key_id, 0); 140 } 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; 191 192 err_out: 193 if (exists) 194 tcf_hash_release(*a, bind); 195 return ret; 196 } 197 198 static 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; 202 203 params = rcu_dereference_protected(t->params, 1); 204 205 if (params->tcft_action == TCA_TUNNEL_KEY_ACT_SET) 206 dst_release(¶ms->tcft_enc_metadata->dst); 207 208 kfree_rcu(params, rcu); 209 } 210 211 static 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 } 238 239 static 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; 251 252 params = rtnl_dereference(t->params); 253 254 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 ¶ms->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, 267 ¶ms->tcft_enc_metadata->u.tun_info) || 268 nla_put_be16(skb, TCA_TUNNEL_KEY_ENC_DST_PORT, key->tp_dst)) 269 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; 276 277 return skb->len; 278 279 nla_put_failure: 280 nlmsg_trim(skb, b); 281 return -1; 282 } 283 284 static 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 } 292 293 static 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 } 299 300 static 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 }; 312 313 static __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 } 319 320 static 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 } 326 327 static 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 }; 333 334 static int __init tunnel_key_init_module(void) 335 { 336 return tcf_register_action(&act_tunnel_key_ops, &tunnel_key_net_ops); 337 } 338 339 static void __exit tunnel_key_cleanup_module(void) 340 { 341 tcf_unregister_action(&act_tunnel_key_ops, &tunnel_key_net_ops); 342 } 343 344 module_init(tunnel_key_init_module); 345 module_exit(tunnel_key_cleanup_module); 346 347 MODULE_AUTHOR("Amir Vadai <amir@vadai.me>"); 348 MODULE_DESCRIPTION("ip tunnel manipulation actions"); 349 MODULE_LICENSE("GPL v2"); 350