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-rw-r--r--net/mptcp/pm_netlink.c2365
1 files changed, 2365 insertions, 0 deletions
diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c
new file mode 100644
index 000000000..980050f6b
--- /dev/null
+++ b/net/mptcp/pm_netlink.c
@@ -0,0 +1,2365 @@
+// 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/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;
+ struct timer_list add_timer;
+ struct mptcp_sock *sock;
+ u8 retrans_times;
+};
+
+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;
+}
+
+static void 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);
+
+ 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)
+{
+ const struct sock *sk = (const struct 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;
+
+ if (entry->addr.family != sk->sk_family) {
+#if IS_ENABLED(CONFIG_MPTCP_IPV6)
+ if ((entry->addr.family == AF_INET &&
+ !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) ||
+ (sk->sk_family == AF_INET &&
+ !ipv6_addr_v4mapped(&entry->addr.addr6)))
+#endif
+ 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;
+
+ 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_pm_addr_entry *entry)
+{
+ 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, &entry->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 = entry->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, 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;
+
+ 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 (!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) {
+ if (subflow->backup != backup)
+ msk->last_snd = NULL;
+
+ 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;
+
+ 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)) {
+ __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++;
+ nr = fill_remote_addresses_vec(msk, fullmesh, addrs);
+ if (nr)
+ __clear_bit(local->addr.id, msk->pm.id_avail_bitmap);
+ 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 *addrs)
+{
+ struct sock *sk = (struct sock *)msk;
+ struct mptcp_pm_addr_entry *entry;
+ struct mptcp_addr_info local;
+ 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 (entry->addr.family != sk->sk_family) {
+#if IS_ENABLED(CONFIG_MPTCP_IPV6)
+ if ((entry->addr.family == AF_INET &&
+ !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) ||
+ (sk->sk_family == AF_INET &&
+ !ipv6_addr_v4mapped(&entry->addr.addr6)))
+#endif
+ 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) {
+ memset(&local, 0, sizeof(local));
+ local.family = msk->pm.remote.family;
+
+ 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, addrs);
+
+ 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;
+
+ 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)
+ goto out;
+ if (test_bit(entry->addr.id, pernet->id_bitmap))
+ 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))
+ 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 socket *ssock;
+ struct sock *newsk;
+ 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);
+ ssock = __mptcp_nmpc_socket(mptcp_sk(newsk));
+ release_sock(newsk);
+ if (!ssock)
+ return -EINVAL;
+
+ 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
+ err = kernel_bind(ssock, (struct sockaddr *)&addr, addrlen);
+ if (err) {
+ pr_warn("kernel_bind error, err=%d", err);
+ return err;
+ }
+
+ inet_sk_state_store(newsk, TCP_LISTEN);
+ err = kernel_listen(ssock, backlog);
+ if (err) {
+ pr_warn("kernel_listen error, err=%d", err);
+ return err;
+ }
+
+ return 0;
+}
+
+int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc)
+{
+ struct mptcp_pm_addr_entry *entry;
+ struct mptcp_addr_info skc_local;
+ struct mptcp_addr_info msk_local;
+ struct pm_nl_pernet *pernet;
+ int ret = -1;
+
+ if (WARN_ON_ONCE(!msk))
+ return -1;
+
+ /* The 0 ID mapping is defined by the first subflow, copied into the msk
+ * addr
+ */
+ local_address((struct sock_common *)msk, &msk_local);
+ local_address((struct sock_common *)skc, &skc_local);
+ if (mptcp_addresses_equal(&msk_local, &skc_local, false))
+ return 0;
+
+ if (mptcp_pm_is_userspace(msk))
+ return mptcp_userspace_pm_get_local_id(msk, &skc_local);
+
+ 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_local, 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_local;
+ 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_UNS_ADMIN_PERM,
+ },
+};
+
+static const struct nla_policy
+mptcp_pm_addr_policy[MPTCP_PM_ADDR_ATTR_MAX + 1] = {
+ [MPTCP_PM_ADDR_ATTR_FAMILY] = { .type = NLA_U16, },
+ [MPTCP_PM_ADDR_ATTR_ID] = { .type = NLA_U8, },
+ [MPTCP_PM_ADDR_ATTR_ADDR4] = { .type = NLA_U32, },
+ [MPTCP_PM_ADDR_ATTR_ADDR6] =
+ NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)),
+ [MPTCP_PM_ADDR_ATTR_PORT] = { .type = NLA_U16 },
+ [MPTCP_PM_ADDR_ATTR_FLAGS] = { .type = NLA_U32 },
+ [MPTCP_PM_ADDR_ATTR_IF_IDX] = { .type = NLA_S32 },
+};
+
+static const struct nla_policy mptcp_pm_policy[MPTCP_PM_ATTR_MAX + 1] = {
+ [MPTCP_PM_ATTR_ADDR] =
+ NLA_POLICY_NESTED(mptcp_pm_addr_policy),
+ [MPTCP_PM_ATTR_RCV_ADD_ADDRS] = { .type = NLA_U32, },
+ [MPTCP_PM_ATTR_SUBFLOWS] = { .type = NLA_U32, },
+ [MPTCP_PM_ATTR_TOKEN] = { .type = NLA_U32, },
+ [MPTCP_PM_ATTR_LOC_ID] = { .type = NLA_U8, },
+ [MPTCP_PM_ATTR_ADDR_REMOTE] =
+ NLA_POLICY_NESTED(mptcp_pm_addr_policy),
+};
+
+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(sock_net(sk), 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_addr_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 err;
+
+ 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 err;
+}
+
+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;
+}
+
+static int mptcp_nl_cmd_add_addr(struct sk_buff *skb, struct genl_info *info)
+{
+ struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_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(info, "create listen socket error");
+ goto out_free;
+ }
+ }
+ ret = mptcp_pm_nl_append_new_local_addr(pernet, entry);
+ if (ret < 0) {
+ GENL_SET_ERR_MSG(info, "too many addresses or duplicate one");
+ 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_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);
+
+ *flags = 0;
+ *ifindex = 0;
+
+ if (id) {
+ if (mptcp_pm_is_userspace(msk))
+ return mptcp_userspace_pm_get_flags_and_ifindex_by_id(msk,
+ id,
+ flags,
+ ifindex);
+
+ 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;
+
+ 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;
+}
+
+static int mptcp_nl_cmd_del_addr(struct sk_buff *skb, struct genl_info *info)
+{
+ struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_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;
+}
+
+static int mptcp_nl_cmd_flush_addrs(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;
+}
+
+static int mptcp_nl_cmd_get_addr(struct sk_buff *skb, struct genl_info *info)
+{
+ struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_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;
+}
+
+static int mptcp_nl_cmd_dump_addrs(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;
+}
+
+static int
+mptcp_nl_cmd_set_limits(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;
+}
+
+static int
+mptcp_nl_cmd_get_limits(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;
+}
+
+static int mptcp_nl_cmd_set_flags(struct sk_buff *skb, struct genl_info *info)
+{
+ struct mptcp_pm_addr_entry addr = { .addr = { .family = AF_UNSPEC }, }, *entry;
+ struct mptcp_pm_addr_entry remote = { .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 pm_nl_pernet *pernet = genl_info_pm_nl(info);
+ u8 changed, mask = MPTCP_PM_ADDR_FLAG_BACKUP |
+ MPTCP_PM_ADDR_FLAG_FULLMESH;
+ struct net *net = sock_net(skb->sk);
+ u8 bkup = 0, lookup_by_id = 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;
+ if (addr.addr.family == AF_UNSPEC) {
+ lookup_by_id = 1;
+ if (!addr.addr.id)
+ return -EOPNOTSUPP;
+ }
+
+ if (token)
+ return mptcp_userspace_pm_set_flags(sock_net(skb->sk),
+ token, &addr, &remote, bkup);
+
+ 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;
+}
+
+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:
+ kfree_skb(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:
+ kfree_skb(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;
+ }
+
+ genlmsg_end(skb, nlh);
+ mptcp_nl_mcast_send(net, skb, gfp);
+ return;
+
+nla_put_failure:
+ kfree_skb(skb);
+}
+
+static const struct genl_small_ops mptcp_pm_ops[] = {
+ {
+ .cmd = MPTCP_PM_CMD_ADD_ADDR,
+ .doit = mptcp_nl_cmd_add_addr,
+ .flags = GENL_UNS_ADMIN_PERM,
+ },
+ {
+ .cmd = MPTCP_PM_CMD_DEL_ADDR,
+ .doit = mptcp_nl_cmd_del_addr,
+ .flags = GENL_UNS_ADMIN_PERM,
+ },
+ {
+ .cmd = MPTCP_PM_CMD_FLUSH_ADDRS,
+ .doit = mptcp_nl_cmd_flush_addrs,
+ .flags = GENL_UNS_ADMIN_PERM,
+ },
+ {
+ .cmd = MPTCP_PM_CMD_GET_ADDR,
+ .doit = mptcp_nl_cmd_get_addr,
+ .dumpit = mptcp_nl_cmd_dump_addrs,
+ },
+ {
+ .cmd = MPTCP_PM_CMD_SET_LIMITS,
+ .doit = mptcp_nl_cmd_set_limits,
+ .flags = GENL_UNS_ADMIN_PERM,
+ },
+ {
+ .cmd = MPTCP_PM_CMD_GET_LIMITS,
+ .doit = mptcp_nl_cmd_get_limits,
+ },
+ {
+ .cmd = MPTCP_PM_CMD_SET_FLAGS,
+ .doit = mptcp_nl_cmd_set_flags,
+ .flags = GENL_UNS_ADMIN_PERM,
+ },
+ {
+ .cmd = MPTCP_PM_CMD_ANNOUNCE,
+ .doit = mptcp_nl_cmd_announce,
+ .flags = GENL_UNS_ADMIN_PERM,
+ },
+ {
+ .cmd = MPTCP_PM_CMD_REMOVE,
+ .doit = mptcp_nl_cmd_remove,
+ .flags = GENL_UNS_ADMIN_PERM,
+ },
+ {
+ .cmd = MPTCP_PM_CMD_SUBFLOW_CREATE,
+ .doit = mptcp_nl_cmd_sf_create,
+ .flags = GENL_UNS_ADMIN_PERM,
+ },
+ {
+ .cmd = MPTCP_PM_CMD_SUBFLOW_DESTROY,
+ .doit = mptcp_nl_cmd_sf_destroy,
+ .flags = GENL_UNS_ADMIN_PERM,
+ },
+};
+
+static struct genl_family mptcp_genl_family __ro_after_init = {
+ .name = MPTCP_PM_NAME,
+ .version = MPTCP_PM_VER,
+ .maxattr = MPTCP_PM_ATTR_MAX,
+ .policy = mptcp_pm_policy,
+ .netnsok = true,
+ .module = THIS_MODULE,
+ .small_ops = mptcp_pm_ops,
+ .n_small_ops = ARRAY_SIZE(mptcp_pm_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");
+}