1 // SPDX-License-Identifier: GPL-2.0
4 * Copyright (c) 2022, Intel Corporation.
10 void mptcp_free_local_addr_list(struct mptcp_sock *msk)
12 struct mptcp_pm_addr_entry *entry, *tmp;
13 struct sock *sk = (struct sock *)msk;
16 if (!mptcp_pm_is_userspace(msk))
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);
23 list_for_each_entry_safe(entry, tmp, &free_list, list) {
24 sock_kfree_s(sk, entry, sizeof(*entry));
28 static int mptcp_userspace_pm_append_new_local_addr(struct mptcp_sock *msk,
29 struct mptcp_pm_addr_entry *entry,
32 DECLARE_BITMAP(id_bitmap, MPTCP_PM_MAX_ADDR_ID + 1);
33 struct mptcp_pm_addr_entry *match = NULL;
34 struct sock *sk = (struct sock *)msk;
35 struct mptcp_pm_addr_entry *e;
36 bool addr_match = false;
37 bool id_match = false;
40 bitmap_zero(id_bitmap, MPTCP_PM_MAX_ADDR_ID + 1);
42 spin_lock_bh(&msk->pm.lock);
43 list_for_each_entry(e, &msk->pm.userspace_pm_local_addr_list, list) {
44 addr_match = mptcp_addresses_equal(&e->addr, &entry->addr, true);
45 if (addr_match && entry->addr.id == 0 && needs_id)
46 entry->addr.id = e->addr.id;
47 id_match = (e->addr.id == entry->addr.id);
48 if (addr_match && id_match) {
51 } else if (addr_match || id_match) {
54 __set_bit(e->addr.id, id_bitmap);
57 if (!match && !addr_match && !id_match) {
58 /* Memory for the entry is allocated from the
61 e = sock_kmalloc(sk, sizeof(*e), GFP_ATOMIC);
63 spin_unlock_bh(&msk->pm.lock);
68 if (!e->addr.id && needs_id)
69 e->addr.id = find_next_zero_bit(id_bitmap,
70 MPTCP_PM_MAX_ADDR_ID + 1,
72 list_add_tail_rcu(&e->list, &msk->pm.userspace_pm_local_addr_list);
73 msk->pm.local_addr_used++;
79 spin_unlock_bh(&msk->pm.lock);
83 /* If the subflow is closed from the other peer (not via a
84 * subflow destroy command then), we want to keep the entry
85 * not to assign the same ID to another address and to be
86 * able to send RM_ADDR after the removal of the subflow.
88 static int mptcp_userspace_pm_delete_local_addr(struct mptcp_sock *msk,
89 struct mptcp_pm_addr_entry *addr)
91 struct mptcp_pm_addr_entry *entry, *tmp;
93 list_for_each_entry_safe(entry, tmp, &msk->pm.userspace_pm_local_addr_list, list) {
94 if (mptcp_addresses_equal(&entry->addr, &addr->addr, false)) {
95 /* TODO: a refcount is needed because the entry can
96 * be used multiple times (e.g. fullmesh mode).
98 list_del_rcu(&entry->list);
100 msk->pm.local_addr_used--;
108 int mptcp_userspace_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk,
110 u8 *flags, int *ifindex)
112 struct mptcp_pm_addr_entry *entry, *match = NULL;
117 spin_lock_bh(&msk->pm.lock);
118 list_for_each_entry(entry, &msk->pm.userspace_pm_local_addr_list, list) {
119 if (id == entry->addr.id) {
124 spin_unlock_bh(&msk->pm.lock);
126 *flags = match->flags;
127 *ifindex = match->ifindex;
133 int mptcp_userspace_pm_get_local_id(struct mptcp_sock *msk,
134 struct mptcp_addr_info *skc)
136 struct mptcp_pm_addr_entry *entry = NULL, *e, new_entry;
137 __be16 msk_sport = ((struct inet_sock *)
138 inet_sk((struct sock *)msk))->inet_sport;
140 spin_lock_bh(&msk->pm.lock);
141 list_for_each_entry(e, &msk->pm.userspace_pm_local_addr_list, list) {
142 if (mptcp_addresses_equal(&e->addr, skc, false)) {
147 spin_unlock_bh(&msk->pm.lock);
149 return entry->addr.id;
151 memset(&new_entry, 0, sizeof(struct mptcp_pm_addr_entry));
152 new_entry.addr = *skc;
153 new_entry.addr.id = 0;
154 new_entry.flags = MPTCP_PM_ADDR_FLAG_IMPLICIT;
156 if (new_entry.addr.port == msk_sport)
157 new_entry.addr.port = 0;
159 return mptcp_userspace_pm_append_new_local_addr(msk, &new_entry, true);
162 int mptcp_nl_cmd_announce(struct sk_buff *skb, struct genl_info *info)
164 struct nlattr *token = info->attrs[MPTCP_PM_ATTR_TOKEN];
165 struct nlattr *addr = info->attrs[MPTCP_PM_ATTR_ADDR];
166 struct mptcp_pm_addr_entry addr_val;
167 struct mptcp_sock *msk;
171 if (!addr || !token) {
172 GENL_SET_ERR_MSG(info, "missing required inputs");
176 token_val = nla_get_u32(token);
178 msk = mptcp_token_get_sock(sock_net(skb->sk), token_val);
180 NL_SET_ERR_MSG_ATTR(info->extack, token, "invalid token");
184 if (!mptcp_pm_is_userspace(msk)) {
185 GENL_SET_ERR_MSG(info, "invalid request; userspace PM not selected");
189 err = mptcp_pm_parse_entry(addr, info, true, &addr_val);
191 GENL_SET_ERR_MSG(info, "error parsing local address");
195 if (addr_val.addr.id == 0 || !(addr_val.flags & MPTCP_PM_ADDR_FLAG_SIGNAL)) {
196 GENL_SET_ERR_MSG(info, "invalid addr id or flags");
201 err = mptcp_userspace_pm_append_new_local_addr(msk, &addr_val, false);
203 GENL_SET_ERR_MSG(info, "did not match address and id");
207 lock_sock((struct sock *)msk);
208 spin_lock_bh(&msk->pm.lock);
210 if (mptcp_pm_alloc_anno_list(msk, &addr_val)) {
211 msk->pm.add_addr_signaled++;
212 mptcp_pm_announce_addr(msk, &addr_val.addr, false);
213 mptcp_pm_nl_addr_send_ack(msk);
216 spin_unlock_bh(&msk->pm.lock);
217 release_sock((struct sock *)msk);
221 sock_put((struct sock *)msk);
225 static int mptcp_userspace_pm_remove_id_zero_address(struct mptcp_sock *msk,
226 struct genl_info *info)
228 struct mptcp_rm_list list = { .nr = 0 };
229 struct mptcp_subflow_context *subflow;
230 struct sock *sk = (struct sock *)msk;
231 bool has_id_0 = false;
235 mptcp_for_each_subflow(msk, subflow) {
236 if (READ_ONCE(subflow->local_id) == 0) {
242 GENL_SET_ERR_MSG(info, "address with id 0 not found");
246 list.ids[list.nr++] = 0;
248 spin_lock_bh(&msk->pm.lock);
249 mptcp_pm_remove_addr(msk, &list);
250 spin_unlock_bh(&msk->pm.lock);
259 int mptcp_nl_cmd_remove(struct sk_buff *skb, struct genl_info *info)
261 struct nlattr *token = info->attrs[MPTCP_PM_ATTR_TOKEN];
262 struct nlattr *id = info->attrs[MPTCP_PM_ATTR_LOC_ID];
263 struct mptcp_pm_addr_entry *match = NULL;
264 struct mptcp_pm_addr_entry *entry;
265 struct mptcp_sock *msk;
266 LIST_HEAD(free_list);
272 GENL_SET_ERR_MSG(info, "missing required inputs");
276 id_val = nla_get_u8(id);
277 token_val = nla_get_u32(token);
279 msk = mptcp_token_get_sock(sock_net(skb->sk), token_val);
281 NL_SET_ERR_MSG_ATTR(info->extack, token, "invalid token");
285 if (!mptcp_pm_is_userspace(msk)) {
286 GENL_SET_ERR_MSG(info, "invalid request; userspace PM not selected");
291 err = mptcp_userspace_pm_remove_id_zero_address(msk, info);
295 lock_sock((struct sock *)msk);
297 list_for_each_entry(entry, &msk->pm.userspace_pm_local_addr_list, list) {
298 if (entry->addr.id == id_val) {
305 GENL_SET_ERR_MSG(info, "address with specified id not found");
306 release_sock((struct sock *)msk);
310 list_move(&match->list, &free_list);
312 mptcp_pm_remove_addrs(msk, &free_list);
314 release_sock((struct sock *)msk);
316 list_for_each_entry_safe(match, entry, &free_list, list) {
317 sock_kfree_s((struct sock *)msk, match, sizeof(*match));
322 sock_put((struct sock *)msk);
326 int mptcp_nl_cmd_sf_create(struct sk_buff *skb, struct genl_info *info)
328 struct nlattr *raddr = info->attrs[MPTCP_PM_ATTR_ADDR_REMOTE];
329 struct nlattr *token = info->attrs[MPTCP_PM_ATTR_TOKEN];
330 struct nlattr *laddr = info->attrs[MPTCP_PM_ATTR_ADDR];
331 struct mptcp_pm_addr_entry local = { 0 };
332 struct mptcp_addr_info addr_r;
333 struct mptcp_addr_info addr_l;
334 struct mptcp_sock *msk;
339 if (!laddr || !raddr || !token) {
340 GENL_SET_ERR_MSG(info, "missing required inputs");
344 token_val = nla_get_u32(token);
346 msk = mptcp_token_get_sock(genl_info_net(info), token_val);
348 NL_SET_ERR_MSG_ATTR(info->extack, token, "invalid token");
352 if (!mptcp_pm_is_userspace(msk)) {
353 GENL_SET_ERR_MSG(info, "invalid request; userspace PM not selected");
357 err = mptcp_pm_parse_addr(laddr, info, &addr_l);
359 NL_SET_ERR_MSG_ATTR(info->extack, laddr, "error parsing local addr");
363 err = mptcp_pm_parse_addr(raddr, info, &addr_r);
365 NL_SET_ERR_MSG_ATTR(info->extack, raddr, "error parsing remote addr");
369 sk = &msk->sk.icsk_inet.sk;
371 if (!mptcp_pm_addr_families_match(sk, &addr_l, &addr_r)) {
372 GENL_SET_ERR_MSG(info, "families mismatch");
378 err = mptcp_userspace_pm_append_new_local_addr(msk, &local, false);
380 GENL_SET_ERR_MSG(info, "did not match address and id");
386 err = __mptcp_subflow_connect(sk, &addr_l, &addr_r);
390 spin_lock_bh(&msk->pm.lock);
392 mptcp_userspace_pm_delete_local_addr(msk, &local);
395 spin_unlock_bh(&msk->pm.lock);
398 sock_put((struct sock *)msk);
402 static struct sock *mptcp_nl_find_ssk(struct mptcp_sock *msk,
403 const struct mptcp_addr_info *local,
404 const struct mptcp_addr_info *remote)
406 struct mptcp_subflow_context *subflow;
408 if (local->family != remote->family)
411 mptcp_for_each_subflow(msk, subflow) {
412 const struct inet_sock *issk;
415 ssk = mptcp_subflow_tcp_sock(subflow);
417 if (local->family != ssk->sk_family)
422 switch (ssk->sk_family) {
424 if (issk->inet_saddr != local->addr.s_addr ||
425 issk->inet_daddr != remote->addr.s_addr)
428 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
430 const struct ipv6_pinfo *pinfo = inet6_sk(ssk);
432 if (!ipv6_addr_equal(&local->addr6, &pinfo->saddr) ||
433 !ipv6_addr_equal(&remote->addr6, &ssk->sk_v6_daddr))
442 if (issk->inet_sport == local->port &&
443 issk->inet_dport == remote->port)
450 int mptcp_nl_cmd_sf_destroy(struct sk_buff *skb, struct genl_info *info)
452 struct nlattr *raddr = info->attrs[MPTCP_PM_ATTR_ADDR_REMOTE];
453 struct nlattr *token = info->attrs[MPTCP_PM_ATTR_TOKEN];
454 struct nlattr *laddr = info->attrs[MPTCP_PM_ATTR_ADDR];
455 struct mptcp_addr_info addr_l;
456 struct mptcp_addr_info addr_r;
457 struct mptcp_sock *msk;
458 struct sock *sk, *ssk;
462 if (!laddr || !raddr || !token) {
463 GENL_SET_ERR_MSG(info, "missing required inputs");
467 token_val = nla_get_u32(token);
469 msk = mptcp_token_get_sock(genl_info_net(info), token_val);
471 NL_SET_ERR_MSG_ATTR(info->extack, token, "invalid token");
475 if (!mptcp_pm_is_userspace(msk)) {
476 GENL_SET_ERR_MSG(info, "invalid request; userspace PM not selected");
480 err = mptcp_pm_parse_addr(laddr, info, &addr_l);
482 NL_SET_ERR_MSG_ATTR(info->extack, laddr, "error parsing local addr");
486 err = mptcp_pm_parse_addr(raddr, info, &addr_r);
488 NL_SET_ERR_MSG_ATTR(info->extack, raddr, "error parsing remote addr");
492 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
493 if (addr_l.family == AF_INET && ipv6_addr_v4mapped(&addr_r.addr6)) {
494 ipv6_addr_set_v4mapped(addr_l.addr.s_addr, &addr_l.addr6);
495 addr_l.family = AF_INET6;
497 if (addr_r.family == AF_INET && ipv6_addr_v4mapped(&addr_l.addr6)) {
498 ipv6_addr_set_v4mapped(addr_r.addr.s_addr, &addr_r.addr6);
499 addr_r.family = AF_INET6;
502 if (addr_l.family != addr_r.family) {
503 GENL_SET_ERR_MSG(info, "address families do not match");
508 if (!addr_l.port || !addr_r.port) {
509 GENL_SET_ERR_MSG(info, "missing local or remote port");
514 sk = &msk->sk.icsk_inet.sk;
516 ssk = mptcp_nl_find_ssk(msk, &addr_l, &addr_r);
518 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);
519 struct mptcp_pm_addr_entry entry = { .addr = addr_l };
521 spin_lock_bh(&msk->pm.lock);
522 mptcp_userspace_pm_delete_local_addr(msk, &entry);
523 spin_unlock_bh(&msk->pm.lock);
524 mptcp_subflow_shutdown(sk, ssk, RCV_SHUTDOWN | SEND_SHUTDOWN);
525 mptcp_close_ssk(sk, ssk, subflow);
526 MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_RMSUBFLOW);
534 sock_put((struct sock *)msk);
538 int mptcp_userspace_pm_set_flags(struct net *net, struct nlattr *token,
539 struct mptcp_pm_addr_entry *loc,
540 struct mptcp_pm_addr_entry *rem, u8 bkup)
542 struct mptcp_sock *msk;
546 token_val = nla_get_u32(token);
548 msk = mptcp_token_get_sock(net, token_val);
552 if (!mptcp_pm_is_userspace(msk))
555 if (loc->addr.family == AF_UNSPEC ||
556 rem->addr.family == AF_UNSPEC)
559 lock_sock((struct sock *)msk);
560 ret = mptcp_pm_nl_mp_prio_send_ack(msk, &loc->addr, &rem->addr, bkup);
561 release_sock((struct sock *)msk);
564 sock_put((struct sock *)msk);