| // SPDX-License-Identifier: GPL-2.0 |
| /* Multipath TCP |
| * |
| * Copyright (c) 2020, Red Hat, Inc. |
| */ |
| |
| #define pr_fmt(fmt) "MPTCP: " fmt |
| |
| #include <linux/inet.h> |
| #include <linux/kernel.h> |
| #include <net/tcp.h> |
| #include <net/inet_common.h> |
| #include <net/netns/generic.h> |
| #include <net/mptcp.h> |
| #include <net/genetlink.h> |
| #include <uapi/linux/mptcp.h> |
| |
| #include "protocol.h" |
| #include "mib.h" |
| |
| /* forward declaration */ |
| static struct genl_family mptcp_genl_family; |
| |
| static int pm_nl_pernet_id; |
| |
| struct mptcp_pm_add_entry { |
| struct list_head list; |
| struct mptcp_addr_info addr; |
| u8 retrans_times; |
| struct timer_list add_timer; |
| struct mptcp_sock *sock; |
| }; |
| |
| struct pm_nl_pernet { |
| /* protects pernet updates */ |
| spinlock_t lock; |
| struct list_head local_addr_list; |
| unsigned int addrs; |
| unsigned int stale_loss_cnt; |
| unsigned int add_addr_signal_max; |
| unsigned int add_addr_accept_max; |
| unsigned int local_addr_max; |
| unsigned int subflows_max; |
| unsigned int next_id; |
| DECLARE_BITMAP(id_bitmap, MPTCP_PM_MAX_ADDR_ID + 1); |
| }; |
| |
| #define MPTCP_PM_ADDR_MAX 8 |
| #define ADD_ADDR_RETRANS_MAX 3 |
| |
| static struct pm_nl_pernet *pm_nl_get_pernet(const struct net *net) |
| { |
| return net_generic(net, pm_nl_pernet_id); |
| } |
| |
| static struct pm_nl_pernet * |
| pm_nl_get_pernet_from_msk(const struct mptcp_sock *msk) |
| { |
| return pm_nl_get_pernet(sock_net((struct sock *)msk)); |
| } |
| |
| bool mptcp_addresses_equal(const struct mptcp_addr_info *a, |
| const struct mptcp_addr_info *b, bool use_port) |
| { |
| bool addr_equals = false; |
| |
| if (a->family == b->family) { |
| if (a->family == AF_INET) |
| addr_equals = a->addr.s_addr == b->addr.s_addr; |
| #if IS_ENABLED(CONFIG_MPTCP_IPV6) |
| else |
| addr_equals = !ipv6_addr_cmp(&a->addr6, &b->addr6); |
| } else if (a->family == AF_INET) { |
| if (ipv6_addr_v4mapped(&b->addr6)) |
| addr_equals = a->addr.s_addr == b->addr6.s6_addr32[3]; |
| } else if (b->family == AF_INET) { |
| if (ipv6_addr_v4mapped(&a->addr6)) |
| addr_equals = a->addr6.s6_addr32[3] == b->addr.s_addr; |
| #endif |
| } |
| |
| if (!addr_equals) |
| return false; |
| if (!use_port) |
| return true; |
| |
| return a->port == b->port; |
| } |
| |
| void mptcp_local_address(const struct sock_common *skc, struct mptcp_addr_info *addr) |
| { |
| addr->family = skc->skc_family; |
| addr->port = htons(skc->skc_num); |
| if (addr->family == AF_INET) |
| addr->addr.s_addr = skc->skc_rcv_saddr; |
| #if IS_ENABLED(CONFIG_MPTCP_IPV6) |
| else if (addr->family == AF_INET6) |
| addr->addr6 = skc->skc_v6_rcv_saddr; |
| #endif |
| } |
| |
| static void remote_address(const struct sock_common *skc, |
| struct mptcp_addr_info *addr) |
| { |
| addr->family = skc->skc_family; |
| addr->port = skc->skc_dport; |
| if (addr->family == AF_INET) |
| addr->addr.s_addr = skc->skc_daddr; |
| #if IS_ENABLED(CONFIG_MPTCP_IPV6) |
| else if (addr->family == AF_INET6) |
| addr->addr6 = skc->skc_v6_daddr; |
| #endif |
| } |
| |
| static bool lookup_subflow_by_saddr(const struct list_head *list, |
| const struct mptcp_addr_info *saddr) |
| { |
| struct mptcp_subflow_context *subflow; |
| struct mptcp_addr_info cur; |
| struct sock_common *skc; |
| |
| list_for_each_entry(subflow, list, node) { |
| skc = (struct sock_common *)mptcp_subflow_tcp_sock(subflow); |
| |
| mptcp_local_address(skc, &cur); |
| if (mptcp_addresses_equal(&cur, saddr, saddr->port)) |
| return true; |
| } |
| |
| return false; |
| } |
| |
| static bool lookup_subflow_by_daddr(const struct list_head *list, |
| const struct mptcp_addr_info *daddr) |
| { |
| struct mptcp_subflow_context *subflow; |
| struct mptcp_addr_info cur; |
| struct sock_common *skc; |
| |
| list_for_each_entry(subflow, list, node) { |
| skc = (struct sock_common *)mptcp_subflow_tcp_sock(subflow); |
| |
| remote_address(skc, &cur); |
| if (mptcp_addresses_equal(&cur, daddr, daddr->port)) |
| return true; |
| } |
| |
| return false; |
| } |
| |
| static struct mptcp_pm_addr_entry * |
| select_local_address(const struct pm_nl_pernet *pernet, |
| const struct mptcp_sock *msk) |
| { |
| struct mptcp_pm_addr_entry *entry, *ret = NULL; |
| |
| msk_owned_by_me(msk); |
| |
| rcu_read_lock(); |
| list_for_each_entry_rcu(entry, &pernet->local_addr_list, list) { |
| if (!(entry->flags & MPTCP_PM_ADDR_FLAG_SUBFLOW)) |
| continue; |
| |
| if (!test_bit(entry->addr.id, msk->pm.id_avail_bitmap)) |
| continue; |
| |
| ret = entry; |
| break; |
| } |
| rcu_read_unlock(); |
| return ret; |
| } |
| |
| static struct mptcp_pm_addr_entry * |
| select_signal_address(struct pm_nl_pernet *pernet, const struct mptcp_sock *msk) |
| { |
| struct mptcp_pm_addr_entry *entry, *ret = NULL; |
| |
| rcu_read_lock(); |
| /* do not keep any additional per socket state, just signal |
| * the address list in order. |
| * Note: removal from the local address list during the msk life-cycle |
| * can lead to additional addresses not being announced. |
| */ |
| list_for_each_entry_rcu(entry, &pernet->local_addr_list, list) { |
| if (!test_bit(entry->addr.id, msk->pm.id_avail_bitmap)) |
| continue; |
| |
| if (!(entry->flags & MPTCP_PM_ADDR_FLAG_SIGNAL)) |
| continue; |
| |
| ret = entry; |
| break; |
| } |
| rcu_read_unlock(); |
| return ret; |
| } |
| |
| unsigned int mptcp_pm_get_add_addr_signal_max(const struct mptcp_sock *msk) |
| { |
| const struct pm_nl_pernet *pernet = pm_nl_get_pernet_from_msk(msk); |
| |
| return READ_ONCE(pernet->add_addr_signal_max); |
| } |
| EXPORT_SYMBOL_GPL(mptcp_pm_get_add_addr_signal_max); |
| |
| unsigned int mptcp_pm_get_add_addr_accept_max(const struct mptcp_sock *msk) |
| { |
| struct pm_nl_pernet *pernet = pm_nl_get_pernet_from_msk(msk); |
| |
| return READ_ONCE(pernet->add_addr_accept_max); |
| } |
| EXPORT_SYMBOL_GPL(mptcp_pm_get_add_addr_accept_max); |
| |
| unsigned int mptcp_pm_get_subflows_max(const struct mptcp_sock *msk) |
| { |
| struct pm_nl_pernet *pernet = pm_nl_get_pernet_from_msk(msk); |
| |
| return READ_ONCE(pernet->subflows_max); |
| } |
| EXPORT_SYMBOL_GPL(mptcp_pm_get_subflows_max); |
| |
| unsigned int mptcp_pm_get_local_addr_max(const struct mptcp_sock *msk) |
| { |
| struct pm_nl_pernet *pernet = pm_nl_get_pernet_from_msk(msk); |
| |
| return READ_ONCE(pernet->local_addr_max); |
| } |
| EXPORT_SYMBOL_GPL(mptcp_pm_get_local_addr_max); |
| |
| bool mptcp_pm_nl_check_work_pending(struct mptcp_sock *msk) |
| { |
| struct pm_nl_pernet *pernet = pm_nl_get_pernet_from_msk(msk); |
| |
| if (msk->pm.subflows == mptcp_pm_get_subflows_max(msk) || |
| (find_next_and_bit(pernet->id_bitmap, msk->pm.id_avail_bitmap, |
| MPTCP_PM_MAX_ADDR_ID + 1, 0) == MPTCP_PM_MAX_ADDR_ID + 1)) { |
| WRITE_ONCE(msk->pm.work_pending, false); |
| return false; |
| } |
| return true; |
| } |
| |
| struct mptcp_pm_add_entry * |
| mptcp_lookup_anno_list_by_saddr(const struct mptcp_sock *msk, |
| const struct mptcp_addr_info *addr) |
| { |
| struct mptcp_pm_add_entry *entry; |
| |
| lockdep_assert_held(&msk->pm.lock); |
| |
| list_for_each_entry(entry, &msk->pm.anno_list, list) { |
| if (mptcp_addresses_equal(&entry->addr, addr, true)) |
| return entry; |
| } |
| |
| return NULL; |
| } |
| |
| bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk) |
| { |
| struct mptcp_pm_add_entry *entry; |
| struct mptcp_addr_info saddr; |
| bool ret = false; |
| |
| mptcp_local_address((struct sock_common *)sk, &saddr); |
| |
| spin_lock_bh(&msk->pm.lock); |
| list_for_each_entry(entry, &msk->pm.anno_list, list) { |
| if (mptcp_addresses_equal(&entry->addr, &saddr, true)) { |
| ret = true; |
| goto out; |
| } |
| } |
| |
| out: |
| spin_unlock_bh(&msk->pm.lock); |
| return ret; |
| } |
| |
| static void mptcp_pm_add_timer(struct timer_list *timer) |
| { |
| struct mptcp_pm_add_entry *entry = from_timer(entry, timer, add_timer); |
| struct mptcp_sock *msk = entry->sock; |
| struct sock *sk = (struct sock *)msk; |
| |
| pr_debug("msk=%p", msk); |
| |
| if (!msk) |
| return; |
| |
| if (inet_sk_state_load(sk) == TCP_CLOSE) |
| return; |
| |
| if (!entry->addr.id) |
| return; |
| |
| if (mptcp_pm_should_add_signal_addr(msk)) { |
| sk_reset_timer(sk, timer, jiffies + TCP_RTO_MAX / 8); |
| goto out; |
| } |
| |
| spin_lock_bh(&msk->pm.lock); |
| |
| if (!mptcp_pm_should_add_signal_addr(msk)) { |
| pr_debug("retransmit ADD_ADDR id=%d", entry->addr.id); |
| mptcp_pm_announce_addr(msk, &entry->addr, false); |
| mptcp_pm_add_addr_send_ack(msk); |
| entry->retrans_times++; |
| } |
| |
| if (entry->retrans_times < ADD_ADDR_RETRANS_MAX) |
| sk_reset_timer(sk, timer, |
| jiffies + mptcp_get_add_addr_timeout(sock_net(sk))); |
| |
| spin_unlock_bh(&msk->pm.lock); |
| |
| if (entry->retrans_times == ADD_ADDR_RETRANS_MAX) |
| mptcp_pm_subflow_established(msk); |
| |
| out: |
| __sock_put(sk); |
| } |
| |
| struct mptcp_pm_add_entry * |
| mptcp_pm_del_add_timer(struct mptcp_sock *msk, |
| const struct mptcp_addr_info *addr, bool check_id) |
| { |
| struct mptcp_pm_add_entry *entry; |
| struct sock *sk = (struct sock *)msk; |
| |
| spin_lock_bh(&msk->pm.lock); |
| entry = mptcp_lookup_anno_list_by_saddr(msk, addr); |
| if (entry && (!check_id || entry->addr.id == addr->id)) |
| entry->retrans_times = ADD_ADDR_RETRANS_MAX; |
| spin_unlock_bh(&msk->pm.lock); |
| |
| if (entry && (!check_id || entry->addr.id == addr->id)) |
| sk_stop_timer_sync(sk, &entry->add_timer); |
| |
| return entry; |
| } |
| |
| bool mptcp_pm_alloc_anno_list(struct mptcp_sock *msk, |
| const struct mptcp_addr_info *addr) |
| { |
| struct mptcp_pm_add_entry *add_entry = NULL; |
| struct sock *sk = (struct sock *)msk; |
| struct net *net = sock_net(sk); |
| |
| lockdep_assert_held(&msk->pm.lock); |
| |
| add_entry = mptcp_lookup_anno_list_by_saddr(msk, addr); |
| |
| if (add_entry) { |
| if (mptcp_pm_is_kernel(msk)) |
| return false; |
| |
| sk_reset_timer(sk, &add_entry->add_timer, |
| jiffies + mptcp_get_add_addr_timeout(net)); |
| return true; |
| } |
| |
| add_entry = kmalloc(sizeof(*add_entry), GFP_ATOMIC); |
| if (!add_entry) |
| return false; |
| |
| list_add(&add_entry->list, &msk->pm.anno_list); |
| |
| add_entry->addr = *addr; |
| add_entry->sock = msk; |
| add_entry->retrans_times = 0; |
| |
| timer_setup(&add_entry->add_timer, mptcp_pm_add_timer, 0); |
| sk_reset_timer(sk, &add_entry->add_timer, |
| jiffies + mptcp_get_add_addr_timeout(net)); |
| |
| return true; |
| } |
| |
| void mptcp_pm_free_anno_list(struct mptcp_sock *msk) |
| { |
| struct mptcp_pm_add_entry *entry, *tmp; |
| struct sock *sk = (struct sock *)msk; |
| LIST_HEAD(free_list); |
| |
| pr_debug("msk=%p", msk); |
| |
| spin_lock_bh(&msk->pm.lock); |
| list_splice_init(&msk->pm.anno_list, &free_list); |
| spin_unlock_bh(&msk->pm.lock); |
| |
| list_for_each_entry_safe(entry, tmp, &free_list, list) { |
| sk_stop_timer_sync(sk, &entry->add_timer); |
| kfree(entry); |
| } |
| } |
| |
| static bool lookup_address_in_vec(const struct mptcp_addr_info *addrs, unsigned int nr, |
| const struct mptcp_addr_info *addr) |
| { |
| int i; |
| |
| for (i = 0; i < nr; i++) { |
| if (addrs[i].id == addr->id) |
| return true; |
| } |
| |
| return false; |
| } |
| |
| /* Fill all the remote addresses into the array addrs[], |
| * and return the array size. |
| */ |
| static unsigned int fill_remote_addresses_vec(struct mptcp_sock *msk, |
| struct mptcp_addr_info *local, |
| bool fullmesh, |
| struct mptcp_addr_info *addrs) |
| { |
| bool deny_id0 = READ_ONCE(msk->pm.remote_deny_join_id0); |
| struct sock *sk = (struct sock *)msk, *ssk; |
| struct mptcp_subflow_context *subflow; |
| struct mptcp_addr_info remote = { 0 }; |
| unsigned int subflows_max; |
| int i = 0; |
| |
| subflows_max = mptcp_pm_get_subflows_max(msk); |
| remote_address((struct sock_common *)sk, &remote); |
| |
| /* Non-fullmesh endpoint, fill in the single entry |
| * corresponding to the primary MPC subflow remote address |
| */ |
| if (!fullmesh) { |
| if (deny_id0) |
| return 0; |
| |
| if (!mptcp_pm_addr_families_match(sk, local, &remote)) |
| return 0; |
| |
| msk->pm.subflows++; |
| addrs[i++] = remote; |
| } else { |
| mptcp_for_each_subflow(msk, subflow) { |
| ssk = mptcp_subflow_tcp_sock(subflow); |
| remote_address((struct sock_common *)ssk, &addrs[i]); |
| addrs[i].id = subflow->remote_id; |
| if (deny_id0 && !addrs[i].id) |
| continue; |
| |
| if (!mptcp_pm_addr_families_match(sk, local, &addrs[i])) |
| continue; |
| |
| if (!lookup_address_in_vec(addrs, i, &addrs[i]) && |
| msk->pm.subflows < subflows_max) { |
| msk->pm.subflows++; |
| i++; |
| } |
| } |
| } |
| |
| return i; |
| } |
| |
| static void __mptcp_pm_send_ack(struct mptcp_sock *msk, struct mptcp_subflow_context *subflow, |
| bool prio, bool backup) |
| { |
| struct sock *ssk = mptcp_subflow_tcp_sock(subflow); |
| bool slow; |
| |
| pr_debug("send ack for %s", |
| prio ? "mp_prio" : (mptcp_pm_should_add_signal(msk) ? "add_addr" : "rm_addr")); |
| |
| slow = lock_sock_fast(ssk); |
| if (prio) { |
| subflow->send_mp_prio = 1; |
| subflow->backup = backup; |
| subflow->request_bkup = backup; |
| } |
| |
| __mptcp_subflow_send_ack(ssk); |
| unlock_sock_fast(ssk, slow); |
| } |
| |
| static void mptcp_pm_send_ack(struct mptcp_sock *msk, struct mptcp_subflow_context *subflow, |
| bool prio, bool backup) |
| { |
| spin_unlock_bh(&msk->pm.lock); |
| __mptcp_pm_send_ack(msk, subflow, prio, backup); |
| spin_lock_bh(&msk->pm.lock); |
| } |
| |
| static struct mptcp_pm_addr_entry * |
| __lookup_addr_by_id(struct pm_nl_pernet *pernet, unsigned int id) |
| { |
| struct mptcp_pm_addr_entry *entry; |
| |
| list_for_each_entry(entry, &pernet->local_addr_list, list) { |
| if (entry->addr.id == id) |
| return entry; |
| } |
| return NULL; |
| } |
| |
| static struct mptcp_pm_addr_entry * |
| __lookup_addr(struct pm_nl_pernet *pernet, const struct mptcp_addr_info *info, |
| bool lookup_by_id) |
| { |
| struct mptcp_pm_addr_entry *entry; |
| |
| list_for_each_entry(entry, &pernet->local_addr_list, list) { |
| if ((!lookup_by_id && |
| mptcp_addresses_equal(&entry->addr, info, entry->addr.port)) || |
| (lookup_by_id && entry->addr.id == info->id)) |
| return entry; |
| } |
| return NULL; |
| } |
| |
| static void mptcp_pm_create_subflow_or_signal_addr(struct mptcp_sock *msk) |
| { |
| struct sock *sk = (struct sock *)msk; |
| struct mptcp_pm_addr_entry *local; |
| unsigned int add_addr_signal_max; |
| unsigned int local_addr_max; |
| struct pm_nl_pernet *pernet; |
| unsigned int subflows_max; |
| |
| pernet = pm_nl_get_pernet(sock_net(sk)); |
| |
| add_addr_signal_max = mptcp_pm_get_add_addr_signal_max(msk); |
| local_addr_max = mptcp_pm_get_local_addr_max(msk); |
| subflows_max = mptcp_pm_get_subflows_max(msk); |
| |
| /* do lazy endpoint usage accounting for the MPC subflows */ |
| if (unlikely(!(msk->pm.status & BIT(MPTCP_PM_MPC_ENDPOINT_ACCOUNTED))) && msk->first) { |
| struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(msk->first); |
| struct mptcp_pm_addr_entry *entry; |
| struct mptcp_addr_info mpc_addr; |
| bool backup = false; |
| |
| mptcp_local_address((struct sock_common *)msk->first, &mpc_addr); |
| rcu_read_lock(); |
| entry = __lookup_addr(pernet, &mpc_addr, false); |
| if (entry) { |
| __clear_bit(entry->addr.id, msk->pm.id_avail_bitmap); |
| msk->mpc_endpoint_id = entry->addr.id; |
| backup = !!(entry->flags & MPTCP_PM_ADDR_FLAG_BACKUP); |
| } |
| rcu_read_unlock(); |
| |
| if (backup) |
| mptcp_pm_send_ack(msk, subflow, true, backup); |
| |
| msk->pm.status |= BIT(MPTCP_PM_MPC_ENDPOINT_ACCOUNTED); |
| } |
| |
| pr_debug("local %d:%d signal %d:%d subflows %d:%d\n", |
| msk->pm.local_addr_used, local_addr_max, |
| msk->pm.add_addr_signaled, add_addr_signal_max, |
| msk->pm.subflows, subflows_max); |
| |
| /* check first for announce */ |
| if (msk->pm.add_addr_signaled < add_addr_signal_max) { |
| local = select_signal_address(pernet, msk); |
| |
| /* due to racing events on both ends we can reach here while |
| * previous add address is still running: if we invoke now |
| * mptcp_pm_announce_addr(), that will fail and the |
| * corresponding id will be marked as used. |
| * Instead let the PM machinery reschedule us when the |
| * current address announce will be completed. |
| */ |
| if (msk->pm.addr_signal & BIT(MPTCP_ADD_ADDR_SIGNAL)) |
| return; |
| |
| if (local) { |
| if (mptcp_pm_alloc_anno_list(msk, &local->addr)) { |
| __clear_bit(local->addr.id, msk->pm.id_avail_bitmap); |
| msk->pm.add_addr_signaled++; |
| mptcp_pm_announce_addr(msk, &local->addr, false); |
| mptcp_pm_nl_addr_send_ack(msk); |
| } |
| } |
| } |
| |
| /* check if should create a new subflow */ |
| while (msk->pm.local_addr_used < local_addr_max && |
| msk->pm.subflows < subflows_max) { |
| struct mptcp_addr_info addrs[MPTCP_PM_ADDR_MAX]; |
| bool fullmesh; |
| int i, nr; |
| |
| local = select_local_address(pernet, msk); |
| if (!local) |
| break; |
| |
| fullmesh = !!(local->flags & MPTCP_PM_ADDR_FLAG_FULLMESH); |
| |
| msk->pm.local_addr_used++; |
| __clear_bit(local->addr.id, msk->pm.id_avail_bitmap); |
| nr = fill_remote_addresses_vec(msk, &local->addr, fullmesh, addrs); |
| if (nr == 0) |
| continue; |
| |
| spin_unlock_bh(&msk->pm.lock); |
| for (i = 0; i < nr; i++) |
| __mptcp_subflow_connect(sk, &local->addr, &addrs[i]); |
| spin_lock_bh(&msk->pm.lock); |
| } |
| mptcp_pm_nl_check_work_pending(msk); |
| } |
| |
| static void mptcp_pm_nl_fully_established(struct mptcp_sock *msk) |
| { |
| mptcp_pm_create_subflow_or_signal_addr(msk); |
| } |
| |
| static void mptcp_pm_nl_subflow_established(struct mptcp_sock *msk) |
| { |
| mptcp_pm_create_subflow_or_signal_addr(msk); |
| } |
| |
| /* Fill all the local addresses into the array addrs[], |
| * and return the array size. |
| */ |
| static unsigned int fill_local_addresses_vec(struct mptcp_sock *msk, |
| struct mptcp_addr_info *remote, |
| struct mptcp_addr_info *addrs) |
| { |
| struct sock *sk = (struct sock *)msk; |
| struct mptcp_pm_addr_entry *entry; |
| struct pm_nl_pernet *pernet; |
| unsigned int subflows_max; |
| int i = 0; |
| |
| pernet = pm_nl_get_pernet_from_msk(msk); |
| subflows_max = mptcp_pm_get_subflows_max(msk); |
| |
| rcu_read_lock(); |
| list_for_each_entry_rcu(entry, &pernet->local_addr_list, list) { |
| if (!(entry->flags & MPTCP_PM_ADDR_FLAG_FULLMESH)) |
| continue; |
| |
| if (!mptcp_pm_addr_families_match(sk, &entry->addr, remote)) |
| continue; |
| |
| if (msk->pm.subflows < subflows_max) { |
| msk->pm.subflows++; |
| addrs[i++] = entry->addr; |
| } |
| } |
| rcu_read_unlock(); |
| |
| /* If the array is empty, fill in the single |
| * 'IPADDRANY' local address |
| */ |
| if (!i) { |
| struct mptcp_addr_info local; |
| |
| memset(&local, 0, sizeof(local)); |
| local.family = |
| #if IS_ENABLED(CONFIG_MPTCP_IPV6) |
| remote->family == AF_INET6 && |
| ipv6_addr_v4mapped(&remote->addr6) ? AF_INET : |
| #endif |
| remote->family; |
| |
| if (!mptcp_pm_addr_families_match(sk, &local, remote)) |
| return 0; |
| |
| msk->pm.subflows++; |
| addrs[i++] = local; |
| } |
| |
| return i; |
| } |
| |
| static void mptcp_pm_nl_add_addr_received(struct mptcp_sock *msk) |
| { |
| struct mptcp_addr_info addrs[MPTCP_PM_ADDR_MAX]; |
| struct sock *sk = (struct sock *)msk; |
| unsigned int add_addr_accept_max; |
| struct mptcp_addr_info remote; |
| unsigned int subflows_max; |
| int i, nr; |
| |
| add_addr_accept_max = mptcp_pm_get_add_addr_accept_max(msk); |
| subflows_max = mptcp_pm_get_subflows_max(msk); |
| |
| pr_debug("accepted %d:%d remote family %d", |
| msk->pm.add_addr_accepted, add_addr_accept_max, |
| msk->pm.remote.family); |
| |
| remote = msk->pm.remote; |
| mptcp_pm_announce_addr(msk, &remote, true); |
| mptcp_pm_nl_addr_send_ack(msk); |
| |
| if (lookup_subflow_by_daddr(&msk->conn_list, &remote)) |
| return; |
| |
| /* pick id 0 port, if none is provided the remote address */ |
| if (!remote.port) |
| remote.port = sk->sk_dport; |
| |
| /* connect to the specified remote address, using whatever |
| * local address the routing configuration will pick. |
| */ |
| nr = fill_local_addresses_vec(msk, &remote, addrs); |
| if (nr == 0) |
| return; |
| |
| msk->pm.add_addr_accepted++; |
| if (msk->pm.add_addr_accepted >= add_addr_accept_max || |
| msk->pm.subflows >= subflows_max) |
| WRITE_ONCE(msk->pm.accept_addr, false); |
| |
| spin_unlock_bh(&msk->pm.lock); |
| for (i = 0; i < nr; i++) |
| __mptcp_subflow_connect(sk, &addrs[i], &remote); |
| spin_lock_bh(&msk->pm.lock); |
| } |
| |
| void mptcp_pm_nl_addr_send_ack(struct mptcp_sock *msk) |
| { |
| struct mptcp_subflow_context *subflow; |
| |
| msk_owned_by_me(msk); |
| lockdep_assert_held(&msk->pm.lock); |
| |
| if (!mptcp_pm_should_add_signal(msk) && |
| !mptcp_pm_should_rm_signal(msk)) |
| return; |
| |
| subflow = list_first_entry_or_null(&msk->conn_list, typeof(*subflow), node); |
| if (subflow) |
| mptcp_pm_send_ack(msk, subflow, false, false); |
| } |
| |
| int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk, |
| struct mptcp_addr_info *addr, |
| struct mptcp_addr_info *rem, |
| u8 bkup) |
| { |
| struct mptcp_subflow_context *subflow; |
| |
| pr_debug("bkup=%d", bkup); |
| |
| mptcp_for_each_subflow(msk, subflow) { |
| struct sock *ssk = mptcp_subflow_tcp_sock(subflow); |
| struct mptcp_addr_info local, remote; |
| |
| mptcp_local_address((struct sock_common *)ssk, &local); |
| if (!mptcp_addresses_equal(&local, addr, addr->port)) |
| continue; |
| |
| if (rem && rem->family != AF_UNSPEC) { |
| remote_address((struct sock_common *)ssk, &remote); |
| if (!mptcp_addresses_equal(&remote, rem, rem->port)) |
| continue; |
| } |
| |
| __mptcp_pm_send_ack(msk, subflow, true, bkup); |
| return 0; |
| } |
| |
| return -EINVAL; |
| } |
| |
| static bool mptcp_local_id_match(const struct mptcp_sock *msk, u8 local_id, u8 id) |
| { |
| return local_id == id || (!local_id && msk->mpc_endpoint_id == id); |
| } |
| |
| static void mptcp_pm_nl_rm_addr_or_subflow(struct mptcp_sock *msk, |
| const struct mptcp_rm_list *rm_list, |
| enum linux_mptcp_mib_field rm_type) |
| { |
| struct mptcp_subflow_context *subflow, *tmp; |
| struct sock *sk = (struct sock *)msk; |
| u8 i; |
| |
| pr_debug("%s rm_list_nr %d", |
| rm_type == MPTCP_MIB_RMADDR ? "address" : "subflow", rm_list->nr); |
| |
| msk_owned_by_me(msk); |
| |
| if (sk->sk_state == TCP_LISTEN) |
| return; |
| |
| if (!rm_list->nr) |
| return; |
| |
| if (list_empty(&msk->conn_list)) |
| return; |
| |
| for (i = 0; i < rm_list->nr; i++) { |
| u8 rm_id = rm_list->ids[i]; |
| bool removed = false; |
| |
| mptcp_for_each_subflow_safe(msk, subflow, tmp) { |
| struct sock *ssk = mptcp_subflow_tcp_sock(subflow); |
| int how = RCV_SHUTDOWN | SEND_SHUTDOWN; |
| u8 id = subflow->local_id; |
| |
| if (rm_type == MPTCP_MIB_RMADDR && subflow->remote_id != rm_id) |
| continue; |
| if (rm_type == MPTCP_MIB_RMSUBFLOW && !mptcp_local_id_match(msk, id, rm_id)) |
| continue; |
| |
| pr_debug(" -> %s rm_list_ids[%d]=%u local_id=%u remote_id=%u mpc_id=%u", |
| rm_type == MPTCP_MIB_RMADDR ? "address" : "subflow", |
| i, rm_id, subflow->local_id, subflow->remote_id, |
| msk->mpc_endpoint_id); |
| spin_unlock_bh(&msk->pm.lock); |
| mptcp_subflow_shutdown(sk, ssk, how); |
| |
| /* the following takes care of updating the subflows counter */ |
| mptcp_close_ssk(sk, ssk, subflow); |
| spin_lock_bh(&msk->pm.lock); |
| |
| removed = true; |
| __MPTCP_INC_STATS(sock_net(sk), rm_type); |
| } |
| if (rm_type == MPTCP_MIB_RMSUBFLOW) |
| __set_bit(rm_id ? rm_id : msk->mpc_endpoint_id, msk->pm.id_avail_bitmap); |
| if (!removed) |
| continue; |
| |
| if (!mptcp_pm_is_kernel(msk)) |
| continue; |
| |
| if (rm_type == MPTCP_MIB_RMADDR) { |
| msk->pm.add_addr_accepted--; |
| WRITE_ONCE(msk->pm.accept_addr, true); |
| } else if (rm_type == MPTCP_MIB_RMSUBFLOW) { |
| msk->pm.local_addr_used--; |
| } |
| } |
| } |
| |
| static void mptcp_pm_nl_rm_addr_received(struct mptcp_sock *msk) |
| { |
| mptcp_pm_nl_rm_addr_or_subflow(msk, &msk->pm.rm_list_rx, MPTCP_MIB_RMADDR); |
| } |
| |
| void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk, |
| const struct mptcp_rm_list *rm_list) |
| { |
| mptcp_pm_nl_rm_addr_or_subflow(msk, rm_list, MPTCP_MIB_RMSUBFLOW); |
| } |
| |
| void mptcp_pm_nl_work(struct mptcp_sock *msk) |
| { |
| struct mptcp_pm_data *pm = &msk->pm; |
| |
| msk_owned_by_me(msk); |
| |
| if (!(pm->status & MPTCP_PM_WORK_MASK)) |
| return; |
| |
| spin_lock_bh(&msk->pm.lock); |
| |
| pr_debug("msk=%p status=%x", msk, pm->status); |
| if (pm->status & BIT(MPTCP_PM_ADD_ADDR_RECEIVED)) { |
| pm->status &= ~BIT(MPTCP_PM_ADD_ADDR_RECEIVED); |
| mptcp_pm_nl_add_addr_received(msk); |
| } |
| if (pm->status & BIT(MPTCP_PM_ADD_ADDR_SEND_ACK)) { |
| pm->status &= ~BIT(MPTCP_PM_ADD_ADDR_SEND_ACK); |
| mptcp_pm_nl_addr_send_ack(msk); |
| } |
| if (pm->status & BIT(MPTCP_PM_RM_ADDR_RECEIVED)) { |
| pm->status &= ~BIT(MPTCP_PM_RM_ADDR_RECEIVED); |
| mptcp_pm_nl_rm_addr_received(msk); |
| } |
| if (pm->status & BIT(MPTCP_PM_ESTABLISHED)) { |
| pm->status &= ~BIT(MPTCP_PM_ESTABLISHED); |
| mptcp_pm_nl_fully_established(msk); |
| } |
| if (pm->status & BIT(MPTCP_PM_SUBFLOW_ESTABLISHED)) { |
| pm->status &= ~BIT(MPTCP_PM_SUBFLOW_ESTABLISHED); |
| mptcp_pm_nl_subflow_established(msk); |
| } |
| |
| spin_unlock_bh(&msk->pm.lock); |
| } |
| |
| static bool address_use_port(struct mptcp_pm_addr_entry *entry) |
| { |
| return (entry->flags & |
| (MPTCP_PM_ADDR_FLAG_SIGNAL | MPTCP_PM_ADDR_FLAG_SUBFLOW)) == |
| MPTCP_PM_ADDR_FLAG_SIGNAL; |
| } |
| |
| /* caller must ensure the RCU grace period is already elapsed */ |
| static void __mptcp_pm_release_addr_entry(struct mptcp_pm_addr_entry *entry) |
| { |
| if (entry->lsk) |
| sock_release(entry->lsk); |
| kfree(entry); |
| } |
| |
| static int mptcp_pm_nl_append_new_local_addr(struct pm_nl_pernet *pernet, |
| struct mptcp_pm_addr_entry *entry) |
| { |
| struct mptcp_pm_addr_entry *cur, *del_entry = NULL; |
| unsigned int addr_max; |
| int ret = -EINVAL; |
| |
| spin_lock_bh(&pernet->lock); |
| /* to keep the code simple, don't do IDR-like allocation for address ID, |
| * just bail when we exceed limits |
| */ |
| if (pernet->next_id == MPTCP_PM_MAX_ADDR_ID) |
| pernet->next_id = 1; |
| if (pernet->addrs >= MPTCP_PM_ADDR_MAX) { |
| ret = -ERANGE; |
| goto out; |
| } |
| if (test_bit(entry->addr.id, pernet->id_bitmap)) { |
| ret = -EBUSY; |
| goto out; |
| } |
| |
| /* do not insert duplicate address, differentiate on port only |
| * singled addresses |
| */ |
| if (!address_use_port(entry)) |
| entry->addr.port = 0; |
| list_for_each_entry(cur, &pernet->local_addr_list, list) { |
| if (mptcp_addresses_equal(&cur->addr, &entry->addr, |
| cur->addr.port || entry->addr.port)) { |
| /* allow replacing the exiting endpoint only if such |
| * endpoint is an implicit one and the user-space |
| * did not provide an endpoint id |
| */ |
| if (!(cur->flags & MPTCP_PM_ADDR_FLAG_IMPLICIT)) { |
| ret = -EEXIST; |
| goto out; |
| } |
| if (entry->addr.id) |
| goto out; |
| |
| pernet->addrs--; |
| entry->addr.id = cur->addr.id; |
| list_del_rcu(&cur->list); |
| del_entry = cur; |
| break; |
| } |
| } |
| |
| if (!entry->addr.id) { |
| find_next: |
| entry->addr.id = find_next_zero_bit(pernet->id_bitmap, |
| MPTCP_PM_MAX_ADDR_ID + 1, |
| pernet->next_id); |
| if (!entry->addr.id && pernet->next_id != 1) { |
| pernet->next_id = 1; |
| goto find_next; |
| } |
| } |
| |
| if (!entry->addr.id) |
| goto out; |
| |
| __set_bit(entry->addr.id, pernet->id_bitmap); |
| if (entry->addr.id > pernet->next_id) |
| pernet->next_id = entry->addr.id; |
| |
| if (entry->flags & MPTCP_PM_ADDR_FLAG_SIGNAL) { |
| addr_max = pernet->add_addr_signal_max; |
| WRITE_ONCE(pernet->add_addr_signal_max, addr_max + 1); |
| } |
| if (entry->flags & MPTCP_PM_ADDR_FLAG_SUBFLOW) { |
| addr_max = pernet->local_addr_max; |
| WRITE_ONCE(pernet->local_addr_max, addr_max + 1); |
| } |
| |
| pernet->addrs++; |
| if (!entry->addr.port) |
| list_add_tail_rcu(&entry->list, &pernet->local_addr_list); |
| else |
| list_add_rcu(&entry->list, &pernet->local_addr_list); |
| ret = entry->addr.id; |
| |
| out: |
| spin_unlock_bh(&pernet->lock); |
| |
| /* just replaced an existing entry, free it */ |
| if (del_entry) { |
| synchronize_rcu(); |
| __mptcp_pm_release_addr_entry(del_entry); |
| } |
| return ret; |
| } |
| |
| static struct lock_class_key mptcp_slock_keys[2]; |
| static struct lock_class_key mptcp_keys[2]; |
| |
| static int mptcp_pm_nl_create_listen_socket(struct sock *sk, |
| struct mptcp_pm_addr_entry *entry) |
| { |
| bool is_ipv6 = sk->sk_family == AF_INET6; |
| int addrlen = sizeof(struct sockaddr_in); |
| struct sockaddr_storage addr; |
| struct sock *newsk, *ssk; |
| int backlog = 1024; |
| int err; |
| |
| err = sock_create_kern(sock_net(sk), entry->addr.family, |
| SOCK_STREAM, IPPROTO_MPTCP, &entry->lsk); |
| if (err) |
| return err; |
| |
| newsk = entry->lsk->sk; |
| if (!newsk) |
| return -EINVAL; |
| |
| /* The subflow socket lock is acquired in a nested to the msk one |
| * in several places, even by the TCP stack, and this msk is a kernel |
| * socket: lockdep complains. Instead of propagating the _nested |
| * modifiers in several places, re-init the lock class for the msk |
| * socket to an mptcp specific one. |
| */ |
| sock_lock_init_class_and_name(newsk, |
| is_ipv6 ? "mlock-AF_INET6" : "mlock-AF_INET", |
| &mptcp_slock_keys[is_ipv6], |
| is_ipv6 ? "msk_lock-AF_INET6" : "msk_lock-AF_INET", |
| &mptcp_keys[is_ipv6]); |
| |
| lock_sock(newsk); |
| ssk = __mptcp_nmpc_sk(mptcp_sk(newsk)); |
| release_sock(newsk); |
| if (IS_ERR(ssk)) |
| return PTR_ERR(ssk); |
| |
| mptcp_info2sockaddr(&entry->addr, &addr, entry->addr.family); |
| #if IS_ENABLED(CONFIG_MPTCP_IPV6) |
| if (entry->addr.family == AF_INET6) |
| addrlen = sizeof(struct sockaddr_in6); |
| #endif |
| if (ssk->sk_family == AF_INET) |
| err = inet_bind_sk(ssk, (struct sockaddr *)&addr, addrlen); |
| #if IS_ENABLED(CONFIG_MPTCP_IPV6) |
| else if (ssk->sk_family == AF_INET6) |
| err = inet6_bind_sk(ssk, (struct sockaddr *)&addr, addrlen); |
| #endif |
| if (err) |
| return err; |
| |
| /* We don't use mptcp_set_state() here because it needs to be called |
| * under the msk socket lock. For the moment, that will not bring |
| * anything more than only calling inet_sk_state_store(), because the |
| * old status is known (TCP_CLOSE). |
| */ |
| inet_sk_state_store(newsk, TCP_LISTEN); |
| lock_sock(ssk); |
| err = __inet_listen_sk(ssk, backlog); |
| if (!err) |
| mptcp_event_pm_listener(ssk, MPTCP_EVENT_LISTENER_CREATED); |
| release_sock(ssk); |
| return err; |
| } |
| |
| int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct mptcp_addr_info *skc) |
| { |
| struct mptcp_pm_addr_entry *entry; |
| struct pm_nl_pernet *pernet; |
| int ret = -1; |
| |
| pernet = pm_nl_get_pernet_from_msk(msk); |
| |
| rcu_read_lock(); |
| list_for_each_entry_rcu(entry, &pernet->local_addr_list, list) { |
| if (mptcp_addresses_equal(&entry->addr, skc, entry->addr.port)) { |
| ret = entry->addr.id; |
| break; |
| } |
| } |
| rcu_read_unlock(); |
| if (ret >= 0) |
| return ret; |
| |
| /* address not found, add to local list */ |
| entry = kmalloc(sizeof(*entry), GFP_ATOMIC); |
| if (!entry) |
| return -ENOMEM; |
| |
| entry->addr = *skc; |
| entry->addr.id = 0; |
| entry->addr.port = 0; |
| entry->ifindex = 0; |
| entry->flags = MPTCP_PM_ADDR_FLAG_IMPLICIT; |
| entry->lsk = NULL; |
| ret = mptcp_pm_nl_append_new_local_addr(pernet, entry); |
| if (ret < 0) |
| kfree(entry); |
| |
| return ret; |
| } |
| |
| #define MPTCP_PM_CMD_GRP_OFFSET 0 |
| #define MPTCP_PM_EV_GRP_OFFSET 1 |
| |
| static const struct genl_multicast_group mptcp_pm_mcgrps[] = { |
| [MPTCP_PM_CMD_GRP_OFFSET] = { .name = MPTCP_PM_CMD_GRP_NAME, }, |
| [MPTCP_PM_EV_GRP_OFFSET] = { .name = MPTCP_PM_EV_GRP_NAME, |
| .flags = GENL_MCAST_CAP_NET_ADMIN, |
| }, |
| }; |
| |
| void mptcp_pm_nl_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk) |
| { |
| struct mptcp_subflow_context *iter, *subflow = mptcp_subflow_ctx(ssk); |
| struct sock *sk = (struct sock *)msk; |
| unsigned int active_max_loss_cnt; |
| struct net *net = sock_net(sk); |
| unsigned int stale_loss_cnt; |
| bool slow; |
| |
| stale_loss_cnt = mptcp_stale_loss_cnt(net); |
| if (subflow->stale || !stale_loss_cnt || subflow->stale_count <= stale_loss_cnt) |
| return; |
| |
| /* look for another available subflow not in loss state */ |
| active_max_loss_cnt = max_t(int, stale_loss_cnt - 1, 1); |
| mptcp_for_each_subflow(msk, iter) { |
| if (iter != subflow && mptcp_subflow_active(iter) && |
| iter->stale_count < active_max_loss_cnt) { |
| /* we have some alternatives, try to mark this subflow as idle ...*/ |
| slow = lock_sock_fast(ssk); |
| if (!tcp_rtx_and_write_queues_empty(ssk)) { |
| subflow->stale = 1; |
| __mptcp_retransmit_pending_data(sk); |
| MPTCP_INC_STATS(net, MPTCP_MIB_SUBFLOWSTALE); |
| } |
| unlock_sock_fast(ssk, slow); |
| |
| /* always try to push the pending data regardless of re-injections: |
| * we can possibly use backup subflows now, and subflow selection |
| * is cheap under the msk socket lock |
| */ |
| __mptcp_push_pending(sk, 0); |
| return; |
| } |
| } |
| } |
| |
| static int mptcp_pm_family_to_addr(int family) |
| { |
| #if IS_ENABLED(CONFIG_MPTCP_IPV6) |
| if (family == AF_INET6) |
| return MPTCP_PM_ADDR_ATTR_ADDR6; |
| #endif |
| return MPTCP_PM_ADDR_ATTR_ADDR4; |
| } |
| |
| static int mptcp_pm_parse_pm_addr_attr(struct nlattr *tb[], |
| const struct nlattr *attr, |
| struct genl_info *info, |
| struct mptcp_addr_info *addr, |
| bool require_family) |
| { |
| int err, addr_addr; |
| |
| if (!attr) { |
| GENL_SET_ERR_MSG(info, "missing address info"); |
| return -EINVAL; |
| } |
| |
| /* no validation needed - was already done via nested policy */ |
| err = nla_parse_nested_deprecated(tb, MPTCP_PM_ADDR_ATTR_MAX, attr, |
| mptcp_pm_address_nl_policy, info->extack); |
| if (err) |
| return err; |
| |
| if (tb[MPTCP_PM_ADDR_ATTR_ID]) |
| addr->id = nla_get_u8(tb[MPTCP_PM_ADDR_ATTR_ID]); |
| |
| if (!tb[MPTCP_PM_ADDR_ATTR_FAMILY]) { |
| if (!require_family) |
| return 0; |
| |
| NL_SET_ERR_MSG_ATTR(info->extack, attr, |
| "missing family"); |
| return -EINVAL; |
| } |
| |
| addr->family = nla_get_u16(tb[MPTCP_PM_ADDR_ATTR_FAMILY]); |
| if (addr->family != AF_INET |
| #if IS_ENABLED(CONFIG_MPTCP_IPV6) |
| && addr->family != AF_INET6 |
| #endif |
| ) { |
| NL_SET_ERR_MSG_ATTR(info->extack, attr, |
| "unknown address family"); |
| return -EINVAL; |
| } |
| addr_addr = mptcp_pm_family_to_addr(addr->family); |
| if (!tb[addr_addr]) { |
| NL_SET_ERR_MSG_ATTR(info->extack, attr, |
| "missing address data"); |
| return -EINVAL; |
| } |
| |
| #if IS_ENABLED(CONFIG_MPTCP_IPV6) |
| if (addr->family == AF_INET6) |
| addr->addr6 = nla_get_in6_addr(tb[addr_addr]); |
| else |
| #endif |
| addr->addr.s_addr = nla_get_in_addr(tb[addr_addr]); |
| |
| if (tb[MPTCP_PM_ADDR_ATTR_PORT]) |
| addr->port = htons(nla_get_u16(tb[MPTCP_PM_ADDR_ATTR_PORT])); |
| |
| return 0; |
| } |
| |
| int mptcp_pm_parse_addr(struct nlattr *attr, struct genl_info *info, |
| struct mptcp_addr_info *addr) |
| { |
| struct nlattr *tb[MPTCP_PM_ADDR_ATTR_MAX + 1]; |
| |
| memset(addr, 0, sizeof(*addr)); |
| |
| return mptcp_pm_parse_pm_addr_attr(tb, attr, info, addr, true); |
| } |
| |
| int mptcp_pm_parse_entry(struct nlattr *attr, struct genl_info *info, |
| bool require_family, |
| struct mptcp_pm_addr_entry *entry) |
| { |
| struct nlattr *tb[MPTCP_PM_ADDR_ATTR_MAX + 1]; |
| int err; |
| |
| memset(entry, 0, sizeof(*entry)); |
| |
| err = mptcp_pm_parse_pm_addr_attr(tb, attr, info, &entry->addr, require_family); |
| if (err) |
| return err; |
| |
| if (tb[MPTCP_PM_ADDR_ATTR_IF_IDX]) { |
| u32 val = nla_get_s32(tb[MPTCP_PM_ADDR_ATTR_IF_IDX]); |
| |
| entry->ifindex = val; |
| } |
| |
| if (tb[MPTCP_PM_ADDR_ATTR_FLAGS]) |
| entry->flags = nla_get_u32(tb[MPTCP_PM_ADDR_ATTR_FLAGS]); |
| |
| if (tb[MPTCP_PM_ADDR_ATTR_PORT]) |
| entry->addr.port = htons(nla_get_u16(tb[MPTCP_PM_ADDR_ATTR_PORT])); |
| |
| return 0; |
| } |
| |
| static struct pm_nl_pernet *genl_info_pm_nl(struct genl_info *info) |
| { |
| return pm_nl_get_pernet(genl_info_net(info)); |
| } |
| |
| static int mptcp_nl_add_subflow_or_signal_addr(struct net *net) |
| { |
| struct mptcp_sock *msk; |
| long s_slot = 0, s_num = 0; |
| |
| while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) { |
| struct sock *sk = (struct sock *)msk; |
| |
| if (!READ_ONCE(msk->fully_established) || |
| mptcp_pm_is_userspace(msk)) |
| goto next; |
| |
| lock_sock(sk); |
| spin_lock_bh(&msk->pm.lock); |
| mptcp_pm_create_subflow_or_signal_addr(msk); |
| spin_unlock_bh(&msk->pm.lock); |
| release_sock(sk); |
| |
| next: |
| sock_put(sk); |
| cond_resched(); |
| } |
| |
| return 0; |
| } |
| |
| int mptcp_pm_nl_add_addr_doit(struct sk_buff *skb, struct genl_info *info) |
| { |
| struct nlattr *attr = info->attrs[MPTCP_PM_ENDPOINT_ADDR]; |
| struct pm_nl_pernet *pernet = genl_info_pm_nl(info); |
| struct mptcp_pm_addr_entry addr, *entry; |
| int ret; |
| |
| ret = mptcp_pm_parse_entry(attr, info, true, &addr); |
| if (ret < 0) |
| return ret; |
| |
| if (addr.addr.port && !(addr.flags & MPTCP_PM_ADDR_FLAG_SIGNAL)) { |
| GENL_SET_ERR_MSG(info, "flags must have signal when using port"); |
| return -EINVAL; |
| } |
| |
| if (addr.flags & MPTCP_PM_ADDR_FLAG_SIGNAL && |
| addr.flags & MPTCP_PM_ADDR_FLAG_FULLMESH) { |
| GENL_SET_ERR_MSG(info, "flags mustn't have both signal and fullmesh"); |
| return -EINVAL; |
| } |
| |
| if (addr.flags & MPTCP_PM_ADDR_FLAG_IMPLICIT) { |
| GENL_SET_ERR_MSG(info, "can't create IMPLICIT endpoint"); |
| return -EINVAL; |
| } |
| |
| entry = kzalloc(sizeof(*entry), GFP_KERNEL_ACCOUNT); |
| if (!entry) { |
| GENL_SET_ERR_MSG(info, "can't allocate addr"); |
| return -ENOMEM; |
| } |
| |
| *entry = addr; |
| if (entry->addr.port) { |
| ret = mptcp_pm_nl_create_listen_socket(skb->sk, entry); |
| if (ret) { |
| GENL_SET_ERR_MSG_FMT(info, "create listen socket error: %d", ret); |
| goto out_free; |
| } |
| } |
| ret = mptcp_pm_nl_append_new_local_addr(pernet, entry); |
| if (ret < 0) { |
| GENL_SET_ERR_MSG_FMT(info, "too many addresses or duplicate one: %d", ret); |
| goto out_free; |
| } |
| |
| mptcp_nl_add_subflow_or_signal_addr(sock_net(skb->sk)); |
| return 0; |
| |
| out_free: |
| __mptcp_pm_release_addr_entry(entry); |
| return ret; |
| } |
| |
| int mptcp_pm_nl_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, unsigned int id, |
| u8 *flags, int *ifindex) |
| { |
| struct mptcp_pm_addr_entry *entry; |
| struct sock *sk = (struct sock *)msk; |
| struct net *net = sock_net(sk); |
| |
| rcu_read_lock(); |
| entry = __lookup_addr_by_id(pm_nl_get_pernet(net), id); |
| if (entry) { |
| *flags = entry->flags; |
| *ifindex = entry->ifindex; |
| } |
| rcu_read_unlock(); |
| |
| return 0; |
| } |
| |
| static bool remove_anno_list_by_saddr(struct mptcp_sock *msk, |
| const struct mptcp_addr_info *addr) |
| { |
| struct mptcp_pm_add_entry *entry; |
| |
| entry = mptcp_pm_del_add_timer(msk, addr, false); |
| if (entry) { |
| list_del(&entry->list); |
| kfree(entry); |
| return true; |
| } |
| |
| return false; |
| } |
| |
| static bool mptcp_pm_remove_anno_addr(struct mptcp_sock *msk, |
| const struct mptcp_addr_info *addr, |
| bool force) |
| { |
| struct mptcp_rm_list list = { .nr = 0 }; |
| bool ret; |
| |
| list.ids[list.nr++] = addr->id; |
| |
| ret = remove_anno_list_by_saddr(msk, addr); |
| if (ret || force) { |
| spin_lock_bh(&msk->pm.lock); |
| mptcp_pm_remove_addr(msk, &list); |
| spin_unlock_bh(&msk->pm.lock); |
| } |
| return ret; |
| } |
| |
| static int mptcp_nl_remove_subflow_and_signal_addr(struct net *net, |
| const struct mptcp_pm_addr_entry *entry) |
| { |
| const struct mptcp_addr_info *addr = &entry->addr; |
| struct mptcp_rm_list list = { .nr = 0 }; |
| long s_slot = 0, s_num = 0; |
| struct mptcp_sock *msk; |
| |
| pr_debug("remove_id=%d", addr->id); |
| |
| list.ids[list.nr++] = addr->id; |
| |
| while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) { |
| struct sock *sk = (struct sock *)msk; |
| bool remove_subflow; |
| |
| if (mptcp_pm_is_userspace(msk)) |
| goto next; |
| |
| if (list_empty(&msk->conn_list)) { |
| mptcp_pm_remove_anno_addr(msk, addr, false); |
| goto next; |
| } |
| |
| lock_sock(sk); |
| remove_subflow = lookup_subflow_by_saddr(&msk->conn_list, addr); |
| mptcp_pm_remove_anno_addr(msk, addr, remove_subflow && |
| !(entry->flags & MPTCP_PM_ADDR_FLAG_IMPLICIT)); |
| if (remove_subflow) |
| mptcp_pm_remove_subflow(msk, &list); |
| release_sock(sk); |
| |
| next: |
| sock_put(sk); |
| cond_resched(); |
| } |
| |
| return 0; |
| } |
| |
| static int mptcp_nl_remove_id_zero_address(struct net *net, |
| struct mptcp_addr_info *addr) |
| { |
| struct mptcp_rm_list list = { .nr = 0 }; |
| long s_slot = 0, s_num = 0; |
| struct mptcp_sock *msk; |
| |
| list.ids[list.nr++] = 0; |
| |
| while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) { |
| struct sock *sk = (struct sock *)msk; |
| struct mptcp_addr_info msk_local; |
| |
| if (list_empty(&msk->conn_list) || mptcp_pm_is_userspace(msk)) |
| goto next; |
| |
| mptcp_local_address((struct sock_common *)msk, &msk_local); |
| if (!mptcp_addresses_equal(&msk_local, addr, addr->port)) |
| goto next; |
| |
| lock_sock(sk); |
| spin_lock_bh(&msk->pm.lock); |
| mptcp_pm_remove_addr(msk, &list); |
| mptcp_pm_nl_rm_subflow_received(msk, &list); |
| spin_unlock_bh(&msk->pm.lock); |
| release_sock(sk); |
| |
| next: |
| sock_put(sk); |
| cond_resched(); |
| } |
| |
| return 0; |
| } |
| |
| int mptcp_pm_nl_del_addr_doit(struct sk_buff *skb, struct genl_info *info) |
| { |
| struct nlattr *attr = info->attrs[MPTCP_PM_ENDPOINT_ADDR]; |
| struct pm_nl_pernet *pernet = genl_info_pm_nl(info); |
| struct mptcp_pm_addr_entry addr, *entry; |
| unsigned int addr_max; |
| int ret; |
| |
| ret = mptcp_pm_parse_entry(attr, info, false, &addr); |
| if (ret < 0) |
| return ret; |
| |
| /* the zero id address is special: the first address used by the msk |
| * always gets such an id, so different subflows can have different zero |
| * id addresses. Additionally zero id is not accounted for in id_bitmap. |
| * Let's use an 'mptcp_rm_list' instead of the common remove code. |
| */ |
| if (addr.addr.id == 0) |
| return mptcp_nl_remove_id_zero_address(sock_net(skb->sk), &addr.addr); |
| |
| spin_lock_bh(&pernet->lock); |
| entry = __lookup_addr_by_id(pernet, addr.addr.id); |
| if (!entry) { |
| GENL_SET_ERR_MSG(info, "address not found"); |
| spin_unlock_bh(&pernet->lock); |
| return -EINVAL; |
| } |
| if (entry->flags & MPTCP_PM_ADDR_FLAG_SIGNAL) { |
| addr_max = pernet->add_addr_signal_max; |
| WRITE_ONCE(pernet->add_addr_signal_max, addr_max - 1); |
| } |
| if (entry->flags & MPTCP_PM_ADDR_FLAG_SUBFLOW) { |
| addr_max = pernet->local_addr_max; |
| WRITE_ONCE(pernet->local_addr_max, addr_max - 1); |
| } |
| |
| pernet->addrs--; |
| list_del_rcu(&entry->list); |
| __clear_bit(entry->addr.id, pernet->id_bitmap); |
| spin_unlock_bh(&pernet->lock); |
| |
| mptcp_nl_remove_subflow_and_signal_addr(sock_net(skb->sk), entry); |
| synchronize_rcu(); |
| __mptcp_pm_release_addr_entry(entry); |
| |
| return ret; |
| } |
| |
| void mptcp_pm_remove_addrs(struct mptcp_sock *msk, struct list_head *rm_list) |
| { |
| struct mptcp_rm_list alist = { .nr = 0 }; |
| struct mptcp_pm_addr_entry *entry; |
| |
| list_for_each_entry(entry, rm_list, list) { |
| if ((remove_anno_list_by_saddr(msk, &entry->addr) || |
| lookup_subflow_by_saddr(&msk->conn_list, &entry->addr)) && |
| alist.nr < MPTCP_RM_IDS_MAX) |
| alist.ids[alist.nr++] = entry->addr.id; |
| } |
| |
| if (alist.nr) { |
| spin_lock_bh(&msk->pm.lock); |
| mptcp_pm_remove_addr(msk, &alist); |
| spin_unlock_bh(&msk->pm.lock); |
| } |
| } |
| |
| void mptcp_pm_remove_addrs_and_subflows(struct mptcp_sock *msk, |
| struct list_head *rm_list) |
| { |
| struct mptcp_rm_list alist = { .nr = 0 }, slist = { .nr = 0 }; |
| struct mptcp_pm_addr_entry *entry; |
| |
| list_for_each_entry(entry, rm_list, list) { |
| if (lookup_subflow_by_saddr(&msk->conn_list, &entry->addr) && |
| slist.nr < MPTCP_RM_IDS_MAX) |
| slist.ids[slist.nr++] = entry->addr.id; |
| |
| if (remove_anno_list_by_saddr(msk, &entry->addr) && |
| alist.nr < MPTCP_RM_IDS_MAX) |
| alist.ids[alist.nr++] = entry->addr.id; |
| } |
| |
| if (alist.nr) { |
| spin_lock_bh(&msk->pm.lock); |
| mptcp_pm_remove_addr(msk, &alist); |
| spin_unlock_bh(&msk->pm.lock); |
| } |
| if (slist.nr) |
| mptcp_pm_remove_subflow(msk, &slist); |
| } |
| |
| static void mptcp_nl_remove_addrs_list(struct net *net, |
| struct list_head *rm_list) |
| { |
| long s_slot = 0, s_num = 0; |
| struct mptcp_sock *msk; |
| |
| if (list_empty(rm_list)) |
| return; |
| |
| while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) { |
| struct sock *sk = (struct sock *)msk; |
| |
| if (!mptcp_pm_is_userspace(msk)) { |
| lock_sock(sk); |
| mptcp_pm_remove_addrs_and_subflows(msk, rm_list); |
| release_sock(sk); |
| } |
| |
| sock_put(sk); |
| cond_resched(); |
| } |
| } |
| |
| /* caller must ensure the RCU grace period is already elapsed */ |
| static void __flush_addrs(struct list_head *list) |
| { |
| while (!list_empty(list)) { |
| struct mptcp_pm_addr_entry *cur; |
| |
| cur = list_entry(list->next, |
| struct mptcp_pm_addr_entry, list); |
| list_del_rcu(&cur->list); |
| __mptcp_pm_release_addr_entry(cur); |
| } |
| } |
| |
| static void __reset_counters(struct pm_nl_pernet *pernet) |
| { |
| WRITE_ONCE(pernet->add_addr_signal_max, 0); |
| WRITE_ONCE(pernet->add_addr_accept_max, 0); |
| WRITE_ONCE(pernet->local_addr_max, 0); |
| pernet->addrs = 0; |
| } |
| |
| int mptcp_pm_nl_flush_addrs_doit(struct sk_buff *skb, struct genl_info *info) |
| { |
| struct pm_nl_pernet *pernet = genl_info_pm_nl(info); |
| LIST_HEAD(free_list); |
| |
| spin_lock_bh(&pernet->lock); |
| list_splice_init(&pernet->local_addr_list, &free_list); |
| __reset_counters(pernet); |
| pernet->next_id = 1; |
| bitmap_zero(pernet->id_bitmap, MPTCP_PM_MAX_ADDR_ID + 1); |
| spin_unlock_bh(&pernet->lock); |
| mptcp_nl_remove_addrs_list(sock_net(skb->sk), &free_list); |
| synchronize_rcu(); |
| __flush_addrs(&free_list); |
| return 0; |
| } |
| |
| static int mptcp_nl_fill_addr(struct sk_buff *skb, |
| struct mptcp_pm_addr_entry *entry) |
| { |
| struct mptcp_addr_info *addr = &entry->addr; |
| struct nlattr *attr; |
| |
| attr = nla_nest_start(skb, MPTCP_PM_ATTR_ADDR); |
| if (!attr) |
| return -EMSGSIZE; |
| |
| if (nla_put_u16(skb, MPTCP_PM_ADDR_ATTR_FAMILY, addr->family)) |
| goto nla_put_failure; |
| if (nla_put_u16(skb, MPTCP_PM_ADDR_ATTR_PORT, ntohs(addr->port))) |
| goto nla_put_failure; |
| if (nla_put_u8(skb, MPTCP_PM_ADDR_ATTR_ID, addr->id)) |
| goto nla_put_failure; |
| if (nla_put_u32(skb, MPTCP_PM_ADDR_ATTR_FLAGS, entry->flags)) |
| goto nla_put_failure; |
| if (entry->ifindex && |
| nla_put_s32(skb, MPTCP_PM_ADDR_ATTR_IF_IDX, entry->ifindex)) |
| goto nla_put_failure; |
| |
| if (addr->family == AF_INET && |
| nla_put_in_addr(skb, MPTCP_PM_ADDR_ATTR_ADDR4, |
| addr->addr.s_addr)) |
| goto nla_put_failure; |
| #if IS_ENABLED(CONFIG_MPTCP_IPV6) |
| else if (addr->family == AF_INET6 && |
| nla_put_in6_addr(skb, MPTCP_PM_ADDR_ATTR_ADDR6, &addr->addr6)) |
| goto nla_put_failure; |
| #endif |
| nla_nest_end(skb, attr); |
| return 0; |
| |
| nla_put_failure: |
| nla_nest_cancel(skb, attr); |
| return -EMSGSIZE; |
| } |
| |
| int mptcp_pm_nl_get_addr_doit(struct sk_buff *skb, struct genl_info *info) |
| { |
| struct nlattr *attr = info->attrs[MPTCP_PM_ENDPOINT_ADDR]; |
| struct pm_nl_pernet *pernet = genl_info_pm_nl(info); |
| struct mptcp_pm_addr_entry addr, *entry; |
| struct sk_buff *msg; |
| void *reply; |
| int ret; |
| |
| ret = mptcp_pm_parse_entry(attr, info, false, &addr); |
| if (ret < 0) |
| return ret; |
| |
| msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
| if (!msg) |
| return -ENOMEM; |
| |
| reply = genlmsg_put_reply(msg, info, &mptcp_genl_family, 0, |
| info->genlhdr->cmd); |
| if (!reply) { |
| GENL_SET_ERR_MSG(info, "not enough space in Netlink message"); |
| ret = -EMSGSIZE; |
| goto fail; |
| } |
| |
| spin_lock_bh(&pernet->lock); |
| entry = __lookup_addr_by_id(pernet, addr.addr.id); |
| if (!entry) { |
| GENL_SET_ERR_MSG(info, "address not found"); |
| ret = -EINVAL; |
| goto unlock_fail; |
| } |
| |
| ret = mptcp_nl_fill_addr(msg, entry); |
| if (ret) |
| goto unlock_fail; |
| |
| genlmsg_end(msg, reply); |
| ret = genlmsg_reply(msg, info); |
| spin_unlock_bh(&pernet->lock); |
| return ret; |
| |
| unlock_fail: |
| spin_unlock_bh(&pernet->lock); |
| |
| fail: |
| nlmsg_free(msg); |
| return ret; |
| } |
| |
| int mptcp_pm_nl_get_addr_dumpit(struct sk_buff *msg, |
| struct netlink_callback *cb) |
| { |
| struct net *net = sock_net(msg->sk); |
| struct mptcp_pm_addr_entry *entry; |
| struct pm_nl_pernet *pernet; |
| int id = cb->args[0]; |
| void *hdr; |
| int i; |
| |
| pernet = pm_nl_get_pernet(net); |
| |
| spin_lock_bh(&pernet->lock); |
| for (i = id; i < MPTCP_PM_MAX_ADDR_ID + 1; i++) { |
| if (test_bit(i, pernet->id_bitmap)) { |
| entry = __lookup_addr_by_id(pernet, i); |
| if (!entry) |
| break; |
| |
| if (entry->addr.id <= id) |
| continue; |
| |
| hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).portid, |
| cb->nlh->nlmsg_seq, &mptcp_genl_family, |
| NLM_F_MULTI, MPTCP_PM_CMD_GET_ADDR); |
| if (!hdr) |
| break; |
| |
| if (mptcp_nl_fill_addr(msg, entry) < 0) { |
| genlmsg_cancel(msg, hdr); |
| break; |
| } |
| |
| id = entry->addr.id; |
| genlmsg_end(msg, hdr); |
| } |
| } |
| spin_unlock_bh(&pernet->lock); |
| |
| cb->args[0] = id; |
| return msg->len; |
| } |
| |
| static int parse_limit(struct genl_info *info, int id, unsigned int *limit) |
| { |
| struct nlattr *attr = info->attrs[id]; |
| |
| if (!attr) |
| return 0; |
| |
| *limit = nla_get_u32(attr); |
| if (*limit > MPTCP_PM_ADDR_MAX) { |
| GENL_SET_ERR_MSG(info, "limit greater than maximum"); |
| return -EINVAL; |
| } |
| return 0; |
| } |
| |
| int mptcp_pm_nl_set_limits_doit(struct sk_buff *skb, struct genl_info *info) |
| { |
| struct pm_nl_pernet *pernet = genl_info_pm_nl(info); |
| unsigned int rcv_addrs, subflows; |
| int ret; |
| |
| spin_lock_bh(&pernet->lock); |
| rcv_addrs = pernet->add_addr_accept_max; |
| ret = parse_limit(info, MPTCP_PM_ATTR_RCV_ADD_ADDRS, &rcv_addrs); |
| if (ret) |
| goto unlock; |
| |
| subflows = pernet->subflows_max; |
| ret = parse_limit(info, MPTCP_PM_ATTR_SUBFLOWS, &subflows); |
| if (ret) |
| goto unlock; |
| |
| WRITE_ONCE(pernet->add_addr_accept_max, rcv_addrs); |
| WRITE_ONCE(pernet->subflows_max, subflows); |
| |
| unlock: |
| spin_unlock_bh(&pernet->lock); |
| return ret; |
| } |
| |
| int mptcp_pm_nl_get_limits_doit(struct sk_buff *skb, struct genl_info *info) |
| { |
| struct pm_nl_pernet *pernet = genl_info_pm_nl(info); |
| struct sk_buff *msg; |
| void *reply; |
| |
| msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
| if (!msg) |
| return -ENOMEM; |
| |
| reply = genlmsg_put_reply(msg, info, &mptcp_genl_family, 0, |
| MPTCP_PM_CMD_GET_LIMITS); |
| if (!reply) |
| goto fail; |
| |
| if (nla_put_u32(msg, MPTCP_PM_ATTR_RCV_ADD_ADDRS, |
| READ_ONCE(pernet->add_addr_accept_max))) |
| goto fail; |
| |
| if (nla_put_u32(msg, MPTCP_PM_ATTR_SUBFLOWS, |
| READ_ONCE(pernet->subflows_max))) |
| goto fail; |
| |
| genlmsg_end(msg, reply); |
| return genlmsg_reply(msg, info); |
| |
| fail: |
| GENL_SET_ERR_MSG(info, "not enough space in Netlink message"); |
| nlmsg_free(msg); |
| return -EMSGSIZE; |
| } |
| |
| static void mptcp_pm_nl_fullmesh(struct mptcp_sock *msk, |
| struct mptcp_addr_info *addr) |
| { |
| struct mptcp_rm_list list = { .nr = 0 }; |
| |
| list.ids[list.nr++] = addr->id; |
| |
| spin_lock_bh(&msk->pm.lock); |
| mptcp_pm_nl_rm_subflow_received(msk, &list); |
| mptcp_pm_create_subflow_or_signal_addr(msk); |
| spin_unlock_bh(&msk->pm.lock); |
| } |
| |
| static int mptcp_nl_set_flags(struct net *net, |
| struct mptcp_addr_info *addr, |
| u8 bkup, u8 changed) |
| { |
| long s_slot = 0, s_num = 0; |
| struct mptcp_sock *msk; |
| int ret = -EINVAL; |
| |
| while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) { |
| struct sock *sk = (struct sock *)msk; |
| |
| if (list_empty(&msk->conn_list) || mptcp_pm_is_userspace(msk)) |
| goto next; |
| |
| lock_sock(sk); |
| if (changed & MPTCP_PM_ADDR_FLAG_BACKUP) |
| ret = mptcp_pm_nl_mp_prio_send_ack(msk, addr, NULL, bkup); |
| if (changed & MPTCP_PM_ADDR_FLAG_FULLMESH) |
| mptcp_pm_nl_fullmesh(msk, addr); |
| release_sock(sk); |
| |
| next: |
| sock_put(sk); |
| cond_resched(); |
| } |
| |
| return ret; |
| } |
| |
| int mptcp_pm_nl_set_flags(struct net *net, struct mptcp_pm_addr_entry *addr, u8 bkup) |
| { |
| struct pm_nl_pernet *pernet = pm_nl_get_pernet(net); |
| u8 changed, mask = MPTCP_PM_ADDR_FLAG_BACKUP | |
| MPTCP_PM_ADDR_FLAG_FULLMESH; |
| struct mptcp_pm_addr_entry *entry; |
| u8 lookup_by_id = 0; |
| |
| if (addr->addr.family == AF_UNSPEC) { |
| lookup_by_id = 1; |
| if (!addr->addr.id) |
| return -EOPNOTSUPP; |
| } |
| |
| spin_lock_bh(&pernet->lock); |
| entry = __lookup_addr(pernet, &addr->addr, lookup_by_id); |
| if (!entry) { |
| spin_unlock_bh(&pernet->lock); |
| return -EINVAL; |
| } |
| if ((addr->flags & MPTCP_PM_ADDR_FLAG_FULLMESH) && |
| (entry->flags & MPTCP_PM_ADDR_FLAG_SIGNAL)) { |
| spin_unlock_bh(&pernet->lock); |
| return -EINVAL; |
| } |
| |
| changed = (addr->flags ^ entry->flags) & mask; |
| entry->flags = (entry->flags & ~mask) | (addr->flags & mask); |
| *addr = *entry; |
| spin_unlock_bh(&pernet->lock); |
| |
| mptcp_nl_set_flags(net, &addr->addr, bkup, changed); |
| return 0; |
| } |
| |
| int mptcp_pm_nl_set_flags_doit(struct sk_buff *skb, struct genl_info *info) |
| { |
| struct mptcp_pm_addr_entry remote = { .addr = { .family = AF_UNSPEC }, }; |
| struct mptcp_pm_addr_entry addr = { .addr = { .family = AF_UNSPEC }, }; |
| struct nlattr *attr_rem = info->attrs[MPTCP_PM_ATTR_ADDR_REMOTE]; |
| struct nlattr *token = info->attrs[MPTCP_PM_ATTR_TOKEN]; |
| struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR]; |
| struct net *net = sock_net(skb->sk); |
| u8 bkup = 0; |
| int ret; |
| |
| ret = mptcp_pm_parse_entry(attr, info, false, &addr); |
| if (ret < 0) |
| return ret; |
| |
| if (attr_rem) { |
| ret = mptcp_pm_parse_entry(attr_rem, info, false, &remote); |
| if (ret < 0) |
| return ret; |
| } |
| |
| if (addr.flags & MPTCP_PM_ADDR_FLAG_BACKUP) |
| bkup = 1; |
| |
| return mptcp_pm_set_flags(net, token, &addr, &remote, bkup); |
| } |
| |
| static void mptcp_nl_mcast_send(struct net *net, struct sk_buff *nlskb, gfp_t gfp) |
| { |
| genlmsg_multicast_netns(&mptcp_genl_family, net, |
| nlskb, 0, MPTCP_PM_EV_GRP_OFFSET, gfp); |
| } |
| |
| bool mptcp_userspace_pm_active(const struct mptcp_sock *msk) |
| { |
| return genl_has_listeners(&mptcp_genl_family, |
| sock_net((const struct sock *)msk), |
| MPTCP_PM_EV_GRP_OFFSET); |
| } |
| |
| static int mptcp_event_add_subflow(struct sk_buff *skb, const struct sock *ssk) |
| { |
| const struct inet_sock *issk = inet_sk(ssk); |
| const struct mptcp_subflow_context *sf; |
| |
| if (nla_put_u16(skb, MPTCP_ATTR_FAMILY, ssk->sk_family)) |
| return -EMSGSIZE; |
| |
| switch (ssk->sk_family) { |
| case AF_INET: |
| if (nla_put_in_addr(skb, MPTCP_ATTR_SADDR4, issk->inet_saddr)) |
| return -EMSGSIZE; |
| if (nla_put_in_addr(skb, MPTCP_ATTR_DADDR4, issk->inet_daddr)) |
| return -EMSGSIZE; |
| break; |
| #if IS_ENABLED(CONFIG_MPTCP_IPV6) |
| case AF_INET6: { |
| const struct ipv6_pinfo *np = inet6_sk(ssk); |
| |
| if (nla_put_in6_addr(skb, MPTCP_ATTR_SADDR6, &np->saddr)) |
| return -EMSGSIZE; |
| if (nla_put_in6_addr(skb, MPTCP_ATTR_DADDR6, &ssk->sk_v6_daddr)) |
| return -EMSGSIZE; |
| break; |
| } |
| #endif |
| default: |
| WARN_ON_ONCE(1); |
| return -EMSGSIZE; |
| } |
| |
| if (nla_put_be16(skb, MPTCP_ATTR_SPORT, issk->inet_sport)) |
| return -EMSGSIZE; |
| if (nla_put_be16(skb, MPTCP_ATTR_DPORT, issk->inet_dport)) |
| return -EMSGSIZE; |
| |
| sf = mptcp_subflow_ctx(ssk); |
| if (WARN_ON_ONCE(!sf)) |
| return -EINVAL; |
| |
| if (nla_put_u8(skb, MPTCP_ATTR_LOC_ID, sf->local_id)) |
| return -EMSGSIZE; |
| |
| if (nla_put_u8(skb, MPTCP_ATTR_REM_ID, sf->remote_id)) |
| return -EMSGSIZE; |
| |
| return 0; |
| } |
| |
| static int mptcp_event_put_token_and_ssk(struct sk_buff *skb, |
| const struct mptcp_sock *msk, |
| const struct sock *ssk) |
| { |
| const struct sock *sk = (const struct sock *)msk; |
| const struct mptcp_subflow_context *sf; |
| u8 sk_err; |
| |
| if (nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token)) |
| return -EMSGSIZE; |
| |
| if (mptcp_event_add_subflow(skb, ssk)) |
| return -EMSGSIZE; |
| |
| sf = mptcp_subflow_ctx(ssk); |
| if (WARN_ON_ONCE(!sf)) |
| return -EINVAL; |
| |
| if (nla_put_u8(skb, MPTCP_ATTR_BACKUP, sf->backup)) |
| return -EMSGSIZE; |
| |
| if (ssk->sk_bound_dev_if && |
| nla_put_s32(skb, MPTCP_ATTR_IF_IDX, ssk->sk_bound_dev_if)) |
| return -EMSGSIZE; |
| |
| sk_err = READ_ONCE(ssk->sk_err); |
| if (sk_err && sk->sk_state == TCP_ESTABLISHED && |
| nla_put_u8(skb, MPTCP_ATTR_ERROR, sk_err)) |
| return -EMSGSIZE; |
| |
| return 0; |
| } |
| |
| static int mptcp_event_sub_established(struct sk_buff *skb, |
| const struct mptcp_sock *msk, |
| const struct sock *ssk) |
| { |
| return mptcp_event_put_token_and_ssk(skb, msk, ssk); |
| } |
| |
| static int mptcp_event_sub_closed(struct sk_buff *skb, |
| const struct mptcp_sock *msk, |
| const struct sock *ssk) |
| { |
| const struct mptcp_subflow_context *sf; |
| |
| if (mptcp_event_put_token_and_ssk(skb, msk, ssk)) |
| return -EMSGSIZE; |
| |
| sf = mptcp_subflow_ctx(ssk); |
| if (!sf->reset_seen) |
| return 0; |
| |
| if (nla_put_u32(skb, MPTCP_ATTR_RESET_REASON, sf->reset_reason)) |
| return -EMSGSIZE; |
| |
| if (nla_put_u32(skb, MPTCP_ATTR_RESET_FLAGS, sf->reset_transient)) |
| return -EMSGSIZE; |
| |
| return 0; |
| } |
| |
| static int mptcp_event_created(struct sk_buff *skb, |
| const struct mptcp_sock *msk, |
| const struct sock *ssk) |
| { |
| int err = nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token); |
| |
| if (err) |
| return err; |
| |
| if (nla_put_u8(skb, MPTCP_ATTR_SERVER_SIDE, READ_ONCE(msk->pm.server_side))) |
| return -EMSGSIZE; |
| |
| return mptcp_event_add_subflow(skb, ssk); |
| } |
| |
| void mptcp_event_addr_removed(const struct mptcp_sock *msk, uint8_t id) |
| { |
| struct net *net = sock_net((const struct sock *)msk); |
| struct nlmsghdr *nlh; |
| struct sk_buff *skb; |
| |
| if (!genl_has_listeners(&mptcp_genl_family, net, MPTCP_PM_EV_GRP_OFFSET)) |
| return; |
| |
| skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); |
| if (!skb) |
| return; |
| |
| nlh = genlmsg_put(skb, 0, 0, &mptcp_genl_family, 0, MPTCP_EVENT_REMOVED); |
| if (!nlh) |
| goto nla_put_failure; |
| |
| if (nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token)) |
| goto nla_put_failure; |
| |
| if (nla_put_u8(skb, MPTCP_ATTR_REM_ID, id)) |
| goto nla_put_failure; |
| |
| genlmsg_end(skb, nlh); |
| mptcp_nl_mcast_send(net, skb, GFP_ATOMIC); |
| return; |
| |
| nla_put_failure: |
| nlmsg_free(skb); |
| } |
| |
| void mptcp_event_addr_announced(const struct sock *ssk, |
| const struct mptcp_addr_info *info) |
| { |
| struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); |
| struct mptcp_sock *msk = mptcp_sk(subflow->conn); |
| struct net *net = sock_net(ssk); |
| struct nlmsghdr *nlh; |
| struct sk_buff *skb; |
| |
| if (!genl_has_listeners(&mptcp_genl_family, net, MPTCP_PM_EV_GRP_OFFSET)) |
| return; |
| |
| skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); |
| if (!skb) |
| return; |
| |
| nlh = genlmsg_put(skb, 0, 0, &mptcp_genl_family, 0, |
| MPTCP_EVENT_ANNOUNCED); |
| if (!nlh) |
| goto nla_put_failure; |
| |
| if (nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token)) |
| goto nla_put_failure; |
| |
| if (nla_put_u8(skb, MPTCP_ATTR_REM_ID, info->id)) |
| goto nla_put_failure; |
| |
| if (nla_put_be16(skb, MPTCP_ATTR_DPORT, |
| info->port == 0 ? |
| inet_sk(ssk)->inet_dport : |
| info->port)) |
| goto nla_put_failure; |
| |
| switch (info->family) { |
| case AF_INET: |
| if (nla_put_in_addr(skb, MPTCP_ATTR_DADDR4, info->addr.s_addr)) |
| goto nla_put_failure; |
| break; |
| #if IS_ENABLED(CONFIG_MPTCP_IPV6) |
| case AF_INET6: |
| if (nla_put_in6_addr(skb, MPTCP_ATTR_DADDR6, &info->addr6)) |
| goto nla_put_failure; |
| break; |
| #endif |
| default: |
| WARN_ON_ONCE(1); |
| goto nla_put_failure; |
| } |
| |
| genlmsg_end(skb, nlh); |
| mptcp_nl_mcast_send(net, skb, GFP_ATOMIC); |
| return; |
| |
| nla_put_failure: |
| nlmsg_free(skb); |
| } |
| |
| void mptcp_event_pm_listener(const struct sock *ssk, |
| enum mptcp_event_type event) |
| { |
| const struct inet_sock *issk = inet_sk(ssk); |
| struct net *net = sock_net(ssk); |
| struct nlmsghdr *nlh; |
| struct sk_buff *skb; |
| |
| if (!genl_has_listeners(&mptcp_genl_family, net, MPTCP_PM_EV_GRP_OFFSET)) |
| return; |
| |
| skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
| if (!skb) |
| return; |
| |
| nlh = genlmsg_put(skb, 0, 0, &mptcp_genl_family, 0, event); |
| if (!nlh) |
| goto nla_put_failure; |
| |
| if (nla_put_u16(skb, MPTCP_ATTR_FAMILY, ssk->sk_family)) |
| goto nla_put_failure; |
| |
| if (nla_put_be16(skb, MPTCP_ATTR_SPORT, issk->inet_sport)) |
| goto nla_put_failure; |
| |
| switch (ssk->sk_family) { |
| case AF_INET: |
| if (nla_put_in_addr(skb, MPTCP_ATTR_SADDR4, issk->inet_saddr)) |
| goto nla_put_failure; |
| break; |
| #if IS_ENABLED(CONFIG_MPTCP_IPV6) |
| case AF_INET6: { |
| const struct ipv6_pinfo *np = inet6_sk(ssk); |
| |
| if (nla_put_in6_addr(skb, MPTCP_ATTR_SADDR6, &np->saddr)) |
| goto nla_put_failure; |
| break; |
| } |
| #endif |
| default: |
| WARN_ON_ONCE(1); |
| goto nla_put_failure; |
| } |
| |
| genlmsg_end(skb, nlh); |
| mptcp_nl_mcast_send(net, skb, GFP_KERNEL); |
| return; |
| |
| nla_put_failure: |
| nlmsg_free(skb); |
| } |
| |
| void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk, |
| const struct sock *ssk, gfp_t gfp) |
| { |
| struct net *net = sock_net((const struct sock *)msk); |
| struct nlmsghdr *nlh; |
| struct sk_buff *skb; |
| |
| if (!genl_has_listeners(&mptcp_genl_family, net, MPTCP_PM_EV_GRP_OFFSET)) |
| return; |
| |
| skb = nlmsg_new(NLMSG_DEFAULT_SIZE, gfp); |
| if (!skb) |
| return; |
| |
| nlh = genlmsg_put(skb, 0, 0, &mptcp_genl_family, 0, type); |
| if (!nlh) |
| goto nla_put_failure; |
| |
| switch (type) { |
| case MPTCP_EVENT_UNSPEC: |
| WARN_ON_ONCE(1); |
| break; |
| case MPTCP_EVENT_CREATED: |
| case MPTCP_EVENT_ESTABLISHED: |
| if (mptcp_event_created(skb, msk, ssk) < 0) |
| goto nla_put_failure; |
| break; |
| case MPTCP_EVENT_CLOSED: |
| if (nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token) < 0) |
| goto nla_put_failure; |
| break; |
| case MPTCP_EVENT_ANNOUNCED: |
| case MPTCP_EVENT_REMOVED: |
| /* call mptcp_event_addr_announced()/removed instead */ |
| WARN_ON_ONCE(1); |
| break; |
| case MPTCP_EVENT_SUB_ESTABLISHED: |
| case MPTCP_EVENT_SUB_PRIORITY: |
| if (mptcp_event_sub_established(skb, msk, ssk) < 0) |
| goto nla_put_failure; |
| break; |
| case MPTCP_EVENT_SUB_CLOSED: |
| if (mptcp_event_sub_closed(skb, msk, ssk) < 0) |
| goto nla_put_failure; |
| break; |
| case MPTCP_EVENT_LISTENER_CREATED: |
| case MPTCP_EVENT_LISTENER_CLOSED: |
| break; |
| } |
| |
| genlmsg_end(skb, nlh); |
| mptcp_nl_mcast_send(net, skb, gfp); |
| return; |
| |
| nla_put_failure: |
| nlmsg_free(skb); |
| } |
| |
| static struct genl_family mptcp_genl_family __ro_after_init = { |
| .name = MPTCP_PM_NAME, |
| .version = MPTCP_PM_VER, |
| .netnsok = true, |
| .module = THIS_MODULE, |
| .ops = mptcp_pm_nl_ops, |
| .n_ops = ARRAY_SIZE(mptcp_pm_nl_ops), |
| .resv_start_op = MPTCP_PM_CMD_SUBFLOW_DESTROY + 1, |
| .mcgrps = mptcp_pm_mcgrps, |
| .n_mcgrps = ARRAY_SIZE(mptcp_pm_mcgrps), |
| }; |
| |
| static int __net_init pm_nl_init_net(struct net *net) |
| { |
| struct pm_nl_pernet *pernet = pm_nl_get_pernet(net); |
| |
| INIT_LIST_HEAD_RCU(&pernet->local_addr_list); |
| |
| /* Cit. 2 subflows ought to be enough for anybody. */ |
| pernet->subflows_max = 2; |
| pernet->next_id = 1; |
| pernet->stale_loss_cnt = 4; |
| spin_lock_init(&pernet->lock); |
| |
| /* No need to initialize other pernet fields, the struct is zeroed at |
| * allocation time. |
| */ |
| |
| return 0; |
| } |
| |
| static void __net_exit pm_nl_exit_net(struct list_head *net_list) |
| { |
| struct net *net; |
| |
| list_for_each_entry(net, net_list, exit_list) { |
| struct pm_nl_pernet *pernet = pm_nl_get_pernet(net); |
| |
| /* net is removed from namespace list, can't race with |
| * other modifiers, also netns core already waited for a |
| * RCU grace period. |
| */ |
| __flush_addrs(&pernet->local_addr_list); |
| } |
| } |
| |
| static struct pernet_operations mptcp_pm_pernet_ops = { |
| .init = pm_nl_init_net, |
| .exit_batch = pm_nl_exit_net, |
| .id = &pm_nl_pernet_id, |
| .size = sizeof(struct pm_nl_pernet), |
| }; |
| |
| void __init mptcp_pm_nl_init(void) |
| { |
| if (register_pernet_subsys(&mptcp_pm_pernet_ops) < 0) |
| panic("Failed to register MPTCP PM pernet subsystem.\n"); |
| |
| if (genl_register_family(&mptcp_genl_family)) |
| panic("Failed to register MPTCP PM netlink family\n"); |
| } |