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 goto announce_err; 160 } 161 162 err = mptcp_userspace_pm_append_new_local_addr(msk, &addr_val); 163 if (err < 0) { 164 GENL_SET_ERR_MSG(info, "did not match address and id"); 165 goto announce_err; 166 } 167 168 lock_sock((struct sock *)msk); 169 spin_lock_bh(&msk->pm.lock); 170 171 if (mptcp_pm_alloc_anno_list(msk, &addr_val)) { 172 mptcp_pm_announce_addr(msk, &addr_val.addr, false); 173 mptcp_pm_nl_addr_send_ack(msk); 174 } 175 176 spin_unlock_bh(&msk->pm.lock); 177 release_sock((struct sock *)msk); 178 179 err = 0; 180 announce_err: 181 sock_put((struct sock *)msk); 182 return err; 183 } 184 185 int mptcp_nl_cmd_remove(struct sk_buff *skb, struct genl_info *info) 186 { 187 struct nlattr *token = info->attrs[MPTCP_PM_ATTR_TOKEN]; 188 struct nlattr *id = info->attrs[MPTCP_PM_ATTR_LOC_ID]; 189 struct mptcp_pm_addr_entry *match = NULL; 190 struct mptcp_pm_addr_entry *entry; 191 struct mptcp_sock *msk; 192 LIST_HEAD(free_list); 193 int err = -EINVAL; 194 u32 token_val; 195 u8 id_val; 196 197 if (!id || !token) { 198 GENL_SET_ERR_MSG(info, "missing required inputs"); 199 return err; 200 } 201 202 id_val = nla_get_u8(id); 203 token_val = nla_get_u32(token); 204 205 msk = mptcp_token_get_sock(sock_net(skb->sk), token_val); 206 if (!msk) { 207 NL_SET_ERR_MSG_ATTR(info->extack, token, "invalid token"); 208 return err; 209 } 210 211 if (!mptcp_pm_is_userspace(msk)) { 212 GENL_SET_ERR_MSG(info, "invalid request; userspace PM not selected"); 213 goto remove_err; 214 } 215 216 lock_sock((struct sock *)msk); 217 218 list_for_each_entry(entry, &msk->pm.userspace_pm_local_addr_list, list) { 219 if (entry->addr.id == id_val) { 220 match = entry; 221 break; 222 } 223 } 224 225 if (!match) { 226 GENL_SET_ERR_MSG(info, "address with specified id not found"); 227 release_sock((struct sock *)msk); 228 goto remove_err; 229 } 230 231 list_move(&match->list, &free_list); 232 233 mptcp_pm_remove_addrs_and_subflows(msk, &free_list); 234 235 release_sock((struct sock *)msk); 236 237 list_for_each_entry_safe(match, entry, &free_list, list) { 238 sock_kfree_s((struct sock *)msk, match, sizeof(*match)); 239 } 240 241 err = 0; 242 remove_err: 243 sock_put((struct sock *)msk); 244 return err; 245 } 246 247 int mptcp_nl_cmd_sf_create(struct sk_buff *skb, struct genl_info *info) 248 { 249 struct nlattr *raddr = info->attrs[MPTCP_PM_ATTR_ADDR_REMOTE]; 250 struct nlattr *token = info->attrs[MPTCP_PM_ATTR_TOKEN]; 251 struct nlattr *laddr = info->attrs[MPTCP_PM_ATTR_ADDR]; 252 struct mptcp_addr_info addr_r; 253 struct mptcp_addr_info addr_l; 254 struct mptcp_sock *msk; 255 int err = -EINVAL; 256 struct sock *sk; 257 u32 token_val; 258 259 if (!laddr || !raddr || !token) { 260 GENL_SET_ERR_MSG(info, "missing required inputs"); 261 return err; 262 } 263 264 token_val = nla_get_u32(token); 265 266 msk = mptcp_token_get_sock(genl_info_net(info), token_val); 267 if (!msk) { 268 NL_SET_ERR_MSG_ATTR(info->extack, token, "invalid token"); 269 return err; 270 } 271 272 if (!mptcp_pm_is_userspace(msk)) { 273 GENL_SET_ERR_MSG(info, "invalid request; userspace PM not selected"); 274 goto create_err; 275 } 276 277 err = mptcp_pm_parse_addr(laddr, info, &addr_l); 278 if (err < 0) { 279 NL_SET_ERR_MSG_ATTR(info->extack, laddr, "error parsing local addr"); 280 goto create_err; 281 } 282 283 if (addr_l.id == 0) { 284 NL_SET_ERR_MSG_ATTR(info->extack, laddr, "missing local addr id"); 285 goto create_err; 286 } 287 288 err = mptcp_pm_parse_addr(raddr, info, &addr_r); 289 if (err < 0) { 290 NL_SET_ERR_MSG_ATTR(info->extack, raddr, "error parsing remote addr"); 291 goto create_err; 292 } 293 294 sk = &msk->sk.icsk_inet.sk; 295 lock_sock(sk); 296 297 err = __mptcp_subflow_connect(sk, &addr_l, &addr_r); 298 299 release_sock(sk); 300 301 create_err: 302 sock_put((struct sock *)msk); 303 return err; 304 } 305 306 static struct sock *mptcp_nl_find_ssk(struct mptcp_sock *msk, 307 const struct mptcp_addr_info *local, 308 const struct mptcp_addr_info *remote) 309 { 310 struct mptcp_subflow_context *subflow; 311 312 if (local->family != remote->family) 313 return NULL; 314 315 mptcp_for_each_subflow(msk, subflow) { 316 const struct inet_sock *issk; 317 struct sock *ssk; 318 319 ssk = mptcp_subflow_tcp_sock(subflow); 320 321 if (local->family != ssk->sk_family) 322 continue; 323 324 issk = inet_sk(ssk); 325 326 switch (ssk->sk_family) { 327 case AF_INET: 328 if (issk->inet_saddr != local->addr.s_addr || 329 issk->inet_daddr != remote->addr.s_addr) 330 continue; 331 break; 332 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 333 case AF_INET6: { 334 const struct ipv6_pinfo *pinfo = inet6_sk(ssk); 335 336 if (!ipv6_addr_equal(&local->addr6, &pinfo->saddr) || 337 !ipv6_addr_equal(&remote->addr6, &ssk->sk_v6_daddr)) 338 continue; 339 break; 340 } 341 #endif 342 default: 343 continue; 344 } 345 346 if (issk->inet_sport == local->port && 347 issk->inet_dport == remote->port) 348 return ssk; 349 } 350 351 return NULL; 352 } 353 354 int mptcp_nl_cmd_sf_destroy(struct sk_buff *skb, struct genl_info *info) 355 { 356 struct nlattr *raddr = info->attrs[MPTCP_PM_ATTR_ADDR_REMOTE]; 357 struct nlattr *token = info->attrs[MPTCP_PM_ATTR_TOKEN]; 358 struct nlattr *laddr = info->attrs[MPTCP_PM_ATTR_ADDR]; 359 struct mptcp_addr_info addr_l; 360 struct mptcp_addr_info addr_r; 361 struct mptcp_sock *msk; 362 struct sock *sk, *ssk; 363 int err = -EINVAL; 364 u32 token_val; 365 366 if (!laddr || !raddr || !token) { 367 GENL_SET_ERR_MSG(info, "missing required inputs"); 368 return err; 369 } 370 371 token_val = nla_get_u32(token); 372 373 msk = mptcp_token_get_sock(genl_info_net(info), token_val); 374 if (!msk) { 375 NL_SET_ERR_MSG_ATTR(info->extack, token, "invalid token"); 376 return err; 377 } 378 379 if (!mptcp_pm_is_userspace(msk)) { 380 GENL_SET_ERR_MSG(info, "invalid request; userspace PM not selected"); 381 goto destroy_err; 382 } 383 384 err = mptcp_pm_parse_addr(laddr, info, &addr_l); 385 if (err < 0) { 386 NL_SET_ERR_MSG_ATTR(info->extack, laddr, "error parsing local addr"); 387 goto destroy_err; 388 } 389 390 err = mptcp_pm_parse_addr(raddr, info, &addr_r); 391 if (err < 0) { 392 NL_SET_ERR_MSG_ATTR(info->extack, raddr, "error parsing remote addr"); 393 goto destroy_err; 394 } 395 396 if (addr_l.family != addr_r.family) { 397 GENL_SET_ERR_MSG(info, "address families do not match"); 398 goto destroy_err; 399 } 400 401 if (!addr_l.port || !addr_r.port) { 402 GENL_SET_ERR_MSG(info, "missing local or remote port"); 403 goto destroy_err; 404 } 405 406 sk = &msk->sk.icsk_inet.sk; 407 lock_sock(sk); 408 ssk = mptcp_nl_find_ssk(msk, &addr_l, &addr_r); 409 if (ssk) { 410 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 411 412 mptcp_subflow_shutdown(sk, ssk, RCV_SHUTDOWN | SEND_SHUTDOWN); 413 mptcp_close_ssk(sk, ssk, subflow); 414 MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_RMSUBFLOW); 415 err = 0; 416 } else { 417 err = -ESRCH; 418 } 419 release_sock(sk); 420 421 destroy_err: 422 sock_put((struct sock *)msk); 423 return err; 424 } 425 426 int mptcp_userspace_pm_set_flags(struct net *net, struct nlattr *token, 427 struct mptcp_pm_addr_entry *loc, 428 struct mptcp_pm_addr_entry *rem, u8 bkup) 429 { 430 struct mptcp_sock *msk; 431 int ret = -EINVAL; 432 u32 token_val; 433 434 token_val = nla_get_u32(token); 435 436 msk = mptcp_token_get_sock(net, token_val); 437 if (!msk) 438 return ret; 439 440 if (!mptcp_pm_is_userspace(msk)) 441 goto set_flags_err; 442 443 if (loc->addr.family == AF_UNSPEC || 444 rem->addr.family == AF_UNSPEC) 445 goto set_flags_err; 446 447 lock_sock((struct sock *)msk); 448 ret = mptcp_pm_nl_mp_prio_send_ack(msk, &loc->addr, &rem->addr, bkup); 449 release_sock((struct sock *)msk); 450 451 set_flags_err: 452 sock_put((struct sock *)msk); 453 return ret; 454 } 455