net/mptcp/pm_userspace.c

   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 }