1 // SPDX-License-Identifier: GPL-2.0 2 /* Multipath TCP 3 * 4 * Copyright (c) 2022, Intel Corporation. 5 */ 6 7 #include "protocol.h" 8 #include "mib.h" 9 10 void mptcp_free_local_addr_list(struct mptcp_sock *msk) 11 { 12 struct mptcp_pm_addr_entry *entry, *tmp; 13 struct sock *sk = (struct sock *)msk; 14 LIST_HEAD(free_list); 15 16 if (!mptcp_pm_is_userspace(msk)) 17 return; 18 19 spin_lock_bh(&msk->pm.lock); 20 list_splice_init(&msk->pm.userspace_pm_local_addr_list, &free_list); 21 spin_unlock_bh(&msk->pm.lock); 22 23 list_for_each_entry_safe(entry, tmp, &free_list, list) { 24 sock_kfree_s(sk, entry, sizeof(*entry)); 25 } 26 } 27 28 int mptcp_userspace_pm_append_new_local_addr(struct mptcp_sock *msk, 29 struct mptcp_pm_addr_entry *entry) 30 { 31 DECLARE_BITMAP(id_bitmap, MPTCP_PM_MAX_ADDR_ID + 1); 32 struct mptcp_pm_addr_entry *match = NULL; 33 struct sock *sk = (struct sock *)msk; 34 struct mptcp_pm_addr_entry *e; 35 bool addr_match = false; 36 bool id_match = false; 37 int ret = -EINVAL; 38 39 bitmap_zero(id_bitmap, MPTCP_PM_MAX_ADDR_ID + 1); 40 41 spin_lock_bh(&msk->pm.lock); 42 list_for_each_entry(e, &msk->pm.userspace_pm_local_addr_list, list) { 43 addr_match = mptcp_addresses_equal(&e->addr, &entry->addr, true); 44 if (addr_match && entry->addr.id == 0) 45 entry->addr.id = e->addr.id; 46 id_match = (e->addr.id == entry->addr.id); 47 if (addr_match && id_match) { 48 match = e; 49 break; 50 } else if (addr_match || id_match) { 51 break; 52 } 53 __set_bit(e->addr.id, id_bitmap); 54 } 55 56 if (!match && !addr_match && !id_match) { 57 /* Memory for the entry is allocated from the 58 * sock option buffer. 59 */ 60 e = sock_kmalloc(sk, sizeof(*e), GFP_ATOMIC); 61 if (!e) { 62 spin_unlock_bh(&msk->pm.lock); 63 return -ENOMEM; 64 } 65 66 *e = *entry; 67 if (!e->addr.id) 68 e->addr.id = find_next_zero_bit(id_bitmap, 69 MPTCP_PM_MAX_ADDR_ID + 1, 70 1); 71 list_add_tail_rcu(&e->list, &msk->pm.userspace_pm_local_addr_list); 72 ret = e->addr.id; 73 } else if (match) { 74 ret = entry->addr.id; 75 } 76 77 spin_unlock_bh(&msk->pm.lock); 78 return ret; 79 } 80 81 int mptcp_userspace_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, 82 unsigned int id, 83 u8 *flags, int *ifindex) 84 { 85 struct mptcp_pm_addr_entry *entry, *match = NULL; 86 87 *flags = 0; 88 *ifindex = 0; 89 90 spin_lock_bh(&msk->pm.lock); 91 list_for_each_entry(entry, &msk->pm.userspace_pm_local_addr_list, list) { 92 if (id == entry->addr.id) { 93 match = entry; 94 break; 95 } 96 } 97 spin_unlock_bh(&msk->pm.lock); 98 if (match) { 99 *flags = match->flags; 100 *ifindex = match->ifindex; 101 } 102 103 return 0; 104 } 105 106 int mptcp_userspace_pm_get_local_id(struct mptcp_sock *msk, 107 struct mptcp_addr_info *skc) 108 { 109 struct mptcp_pm_addr_entry new_entry; 110 __be16 msk_sport = ((struct inet_sock *) 111 inet_sk((struct sock *)msk))->inet_sport; 112 113 memset(&new_entry, 0, sizeof(struct mptcp_pm_addr_entry)); 114 new_entry.addr = *skc; 115 new_entry.addr.id = 0; 116 new_entry.flags = MPTCP_PM_ADDR_FLAG_IMPLICIT; 117 118 if (new_entry.addr.port == msk_sport) 119 new_entry.addr.port = 0; 120 121 return mptcp_userspace_pm_append_new_local_addr(msk, &new_entry); 122 } 123 124 int mptcp_nl_cmd_announce(struct sk_buff *skb, struct genl_info *info) 125 { 126 struct nlattr *token = info->attrs[MPTCP_PM_ATTR_TOKEN]; 127 struct nlattr *addr = info->attrs[MPTCP_PM_ATTR_ADDR]; 128 struct mptcp_pm_addr_entry addr_val; 129 struct mptcp_sock *msk; 130 int err = -EINVAL; 131 u32 token_val; 132 133 if (!addr || !token) { 134 GENL_SET_ERR_MSG(info, "missing required inputs"); 135 return err; 136 } 137 138 token_val = nla_get_u32(token); 139 140 msk = mptcp_token_get_sock(sock_net(skb->sk), token_val); 141 if (!msk) { 142 NL_SET_ERR_MSG_ATTR(info->extack, token, "invalid token"); 143 return err; 144 } 145 146 if (!mptcp_pm_is_userspace(msk)) { 147 GENL_SET_ERR_MSG(info, "invalid request; userspace PM not selected"); 148 goto announce_err; 149 } 150 151 err = mptcp_pm_parse_entry(addr, info, true, &addr_val); 152 if (err < 0) { 153 GENL_SET_ERR_MSG(info, "error parsing local address"); 154 goto announce_err; 155 } 156 157 if (addr_val.addr.id == 0 || !(addr_val.flags & MPTCP_PM_ADDR_FLAG_SIGNAL)) { 158 GENL_SET_ERR_MSG(info, "invalid addr id or flags"); 159 err = -EINVAL; 160 goto announce_err; 161 } 162 163 err = mptcp_userspace_pm_append_new_local_addr(msk, &addr_val); 164 if (err < 0) { 165 GENL_SET_ERR_MSG(info, "did not match address and id"); 166 goto announce_err; 167 } 168 169 lock_sock((struct sock *)msk); 170 spin_lock_bh(&msk->pm.lock); 171 172 if (mptcp_pm_alloc_anno_list(msk, &addr_val)) { 173 mptcp_pm_announce_addr(msk, &addr_val.addr, false); 174 mptcp_pm_nl_addr_send_ack(msk); 175 } 176 177 spin_unlock_bh(&msk->pm.lock); 178 release_sock((struct sock *)msk); 179 180 err = 0; 181 announce_err: 182 sock_put((struct sock *)msk); 183 return err; 184 } 185 186 int mptcp_nl_cmd_remove(struct sk_buff *skb, struct genl_info *info) 187 { 188 struct nlattr *token = info->attrs[MPTCP_PM_ATTR_TOKEN]; 189 struct nlattr *id = info->attrs[MPTCP_PM_ATTR_LOC_ID]; 190 struct mptcp_pm_addr_entry *match = NULL; 191 struct mptcp_pm_addr_entry *entry; 192 struct mptcp_sock *msk; 193 LIST_HEAD(free_list); 194 int err = -EINVAL; 195 u32 token_val; 196 u8 id_val; 197 198 if (!id || !token) { 199 GENL_SET_ERR_MSG(info, "missing required inputs"); 200 return err; 201 } 202 203 id_val = nla_get_u8(id); 204 token_val = nla_get_u32(token); 205 206 msk = mptcp_token_get_sock(sock_net(skb->sk), token_val); 207 if (!msk) { 208 NL_SET_ERR_MSG_ATTR(info->extack, token, "invalid token"); 209 return err; 210 } 211 212 if (!mptcp_pm_is_userspace(msk)) { 213 GENL_SET_ERR_MSG(info, "invalid request; userspace PM not selected"); 214 goto remove_err; 215 } 216 217 lock_sock((struct sock *)msk); 218 219 list_for_each_entry(entry, &msk->pm.userspace_pm_local_addr_list, list) { 220 if (entry->addr.id == id_val) { 221 match = entry; 222 break; 223 } 224 } 225 226 if (!match) { 227 GENL_SET_ERR_MSG(info, "address with specified id not found"); 228 release_sock((struct sock *)msk); 229 goto remove_err; 230 } 231 232 list_move(&match->list, &free_list); 233 234 mptcp_pm_remove_addrs_and_subflows(msk, &free_list); 235 236 release_sock((struct sock *)msk); 237 238 list_for_each_entry_safe(match, entry, &free_list, list) { 239 sock_kfree_s((struct sock *)msk, match, sizeof(*match)); 240 } 241 242 err = 0; 243 remove_err: 244 sock_put((struct sock *)msk); 245 return err; 246 } 247 248 int mptcp_nl_cmd_sf_create(struct sk_buff *skb, struct genl_info *info) 249 { 250 struct nlattr *raddr = info->attrs[MPTCP_PM_ATTR_ADDR_REMOTE]; 251 struct nlattr *token = info->attrs[MPTCP_PM_ATTR_TOKEN]; 252 struct nlattr *laddr = info->attrs[MPTCP_PM_ATTR_ADDR]; 253 struct mptcp_addr_info addr_r; 254 struct mptcp_addr_info addr_l; 255 struct mptcp_sock *msk; 256 int err = -EINVAL; 257 struct sock *sk; 258 u32 token_val; 259 260 if (!laddr || !raddr || !token) { 261 GENL_SET_ERR_MSG(info, "missing required inputs"); 262 return err; 263 } 264 265 token_val = nla_get_u32(token); 266 267 msk = mptcp_token_get_sock(genl_info_net(info), token_val); 268 if (!msk) { 269 NL_SET_ERR_MSG_ATTR(info->extack, token, "invalid token"); 270 return err; 271 } 272 273 if (!mptcp_pm_is_userspace(msk)) { 274 GENL_SET_ERR_MSG(info, "invalid request; userspace PM not selected"); 275 goto create_err; 276 } 277 278 err = mptcp_pm_parse_addr(laddr, info, &addr_l); 279 if (err < 0) { 280 NL_SET_ERR_MSG_ATTR(info->extack, laddr, "error parsing local addr"); 281 goto create_err; 282 } 283 284 if (addr_l.id == 0) { 285 NL_SET_ERR_MSG_ATTR(info->extack, laddr, "missing local addr id"); 286 err = -EINVAL; 287 goto create_err; 288 } 289 290 err = mptcp_pm_parse_addr(raddr, info, &addr_r); 291 if (err < 0) { 292 NL_SET_ERR_MSG_ATTR(info->extack, raddr, "error parsing remote addr"); 293 goto create_err; 294 } 295 296 sk = (struct sock *)msk; 297 lock_sock(sk); 298 299 err = __mptcp_subflow_connect(sk, &addr_l, &addr_r); 300 301 release_sock(sk); 302 303 create_err: 304 sock_put((struct sock *)msk); 305 return err; 306 } 307 308 static struct sock *mptcp_nl_find_ssk(struct mptcp_sock *msk, 309 const struct mptcp_addr_info *local, 310 const struct mptcp_addr_info *remote) 311 { 312 struct mptcp_subflow_context *subflow; 313 314 if (local->family != remote->family) 315 return NULL; 316 317 mptcp_for_each_subflow(msk, subflow) { 318 const struct inet_sock *issk; 319 struct sock *ssk; 320 321 ssk = mptcp_subflow_tcp_sock(subflow); 322 323 if (local->family != ssk->sk_family) 324 continue; 325 326 issk = inet_sk(ssk); 327 328 switch (ssk->sk_family) { 329 case AF_INET: 330 if (issk->inet_saddr != local->addr.s_addr || 331 issk->inet_daddr != remote->addr.s_addr) 332 continue; 333 break; 334 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 335 case AF_INET6: { 336 const struct ipv6_pinfo *pinfo = inet6_sk(ssk); 337 338 if (!ipv6_addr_equal(&local->addr6, &pinfo->saddr) || 339 !ipv6_addr_equal(&remote->addr6, &ssk->sk_v6_daddr)) 340 continue; 341 break; 342 } 343 #endif 344 default: 345 continue; 346 } 347 348 if (issk->inet_sport == local->port && 349 issk->inet_dport == remote->port) 350 return ssk; 351 } 352 353 return NULL; 354 } 355 356 int mptcp_nl_cmd_sf_destroy(struct sk_buff *skb, struct genl_info *info) 357 { 358 struct nlattr *raddr = info->attrs[MPTCP_PM_ATTR_ADDR_REMOTE]; 359 struct nlattr *token = info->attrs[MPTCP_PM_ATTR_TOKEN]; 360 struct nlattr *laddr = info->attrs[MPTCP_PM_ATTR_ADDR]; 361 struct mptcp_addr_info addr_l; 362 struct mptcp_addr_info addr_r; 363 struct mptcp_sock *msk; 364 struct sock *sk, *ssk; 365 int err = -EINVAL; 366 u32 token_val; 367 368 if (!laddr || !raddr || !token) { 369 GENL_SET_ERR_MSG(info, "missing required inputs"); 370 return err; 371 } 372 373 token_val = nla_get_u32(token); 374 375 msk = mptcp_token_get_sock(genl_info_net(info), token_val); 376 if (!msk) { 377 NL_SET_ERR_MSG_ATTR(info->extack, token, "invalid token"); 378 return err; 379 } 380 381 if (!mptcp_pm_is_userspace(msk)) { 382 GENL_SET_ERR_MSG(info, "invalid request; userspace PM not selected"); 383 goto destroy_err; 384 } 385 386 err = mptcp_pm_parse_addr(laddr, info, &addr_l); 387 if (err < 0) { 388 NL_SET_ERR_MSG_ATTR(info->extack, laddr, "error parsing local addr"); 389 goto destroy_err; 390 } 391 392 err = mptcp_pm_parse_addr(raddr, info, &addr_r); 393 if (err < 0) { 394 NL_SET_ERR_MSG_ATTR(info->extack, raddr, "error parsing remote addr"); 395 goto destroy_err; 396 } 397 398 if (addr_l.family != addr_r.family) { 399 GENL_SET_ERR_MSG(info, "address families do not match"); 400 err = -EINVAL; 401 goto destroy_err; 402 } 403 404 if (!addr_l.port || !addr_r.port) { 405 GENL_SET_ERR_MSG(info, "missing local or remote port"); 406 err = -EINVAL; 407 goto destroy_err; 408 } 409 410 sk = (struct sock *)msk; 411 lock_sock(sk); 412 ssk = mptcp_nl_find_ssk(msk, &addr_l, &addr_r); 413 if (ssk) { 414 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 415 416 mptcp_subflow_shutdown(sk, ssk, RCV_SHUTDOWN | SEND_SHUTDOWN); 417 mptcp_close_ssk(sk, ssk, subflow); 418 MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_RMSUBFLOW); 419 err = 0; 420 } else { 421 err = -ESRCH; 422 } 423 release_sock(sk); 424 425 destroy_err: 426 sock_put((struct sock *)msk); 427 return err; 428 } 429 430 int mptcp_userspace_pm_set_flags(struct net *net, struct nlattr *token, 431 struct mptcp_pm_addr_entry *loc, 432 struct mptcp_pm_addr_entry *rem, u8 bkup) 433 { 434 struct mptcp_sock *msk; 435 int ret = -EINVAL; 436 u32 token_val; 437 438 token_val = nla_get_u32(token); 439 440 msk = mptcp_token_get_sock(net, token_val); 441 if (!msk) 442 return ret; 443 444 if (!mptcp_pm_is_userspace(msk)) 445 goto set_flags_err; 446 447 if (loc->addr.family == AF_UNSPEC || 448 rem->addr.family == AF_UNSPEC) 449 goto set_flags_err; 450 451 lock_sock((struct sock *)msk); 452 ret = mptcp_pm_nl_mp_prio_send_ack(msk, &loc->addr, &rem->addr, bkup); 453 release_sock((struct sock *)msk); 454 455 set_flags_err: 456 sock_put((struct sock *)msk); 457 return ret; 458 } 459