From: Geliang Tang Date: Thu, 24 Sep 2020 00:30:02 +0000 (+0800) Subject: mptcp: retransmit ADD_ADDR when timeout X-Git-Tag: v5.15~2655^2~153^2 X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=00cfd77b9063dcdf3628a7087faba60de85a9cc8;p=mirror_ubuntu-kernels.git mptcp: retransmit ADD_ADDR when timeout This patch implemented the retransmition of ADD_ADDR when no ADD_ADDR echo is received. It added a timer with the announced address. When timeout occurs, ADD_ADDR will be retransmitted. Suggested-by: Mat Martineau Suggested-by: Paolo Abeni Acked-by: Paolo Abeni Signed-off-by: Geliang Tang Reviewed-by: Mat Martineau Signed-off-by: David S. Miller --- diff --git a/net/mptcp/options.c b/net/mptcp/options.c index 171039cbe9c4..14a290fae767 100644 --- a/net/mptcp/options.c +++ b/net/mptcp/options.c @@ -893,6 +893,7 @@ void mptcp_incoming_options(struct sock *sk, struct sk_buff *skb, mptcp_pm_add_addr_received(msk, &addr); MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_ADDADDR); } else { + mptcp_pm_del_add_timer(msk, &addr); MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_ECHOADD); } mp_opt.add_addr = 0; diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c index 701972b55a45..5a0e4d11bcc3 100644 --- a/net/mptcp/pm_netlink.c +++ b/net/mptcp/pm_netlink.c @@ -31,6 +31,9 @@ struct mptcp_pm_addr_entry { 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 { @@ -46,6 +49,7 @@ struct pm_nl_pernet { }; #define MPTCP_PM_ADDR_MAX 8 +#define ADD_ADDR_RETRANS_MAX 3 static bool addresses_equal(const struct mptcp_addr_info *a, struct mptcp_addr_info *b, bool use_port) @@ -183,23 +187,83 @@ static void check_work_pending(struct mptcp_sock *msk) WRITE_ONCE(msk->pm.work_pending, false); } -static bool lookup_anno_list_by_saddr(struct mptcp_sock *msk, - struct mptcp_addr_info *addr) +static struct mptcp_pm_add_entry * +lookup_anno_list_by_saddr(struct mptcp_sock *msk, + struct mptcp_addr_info *addr) { struct mptcp_pm_add_entry *entry; list_for_each_entry(entry, &msk->pm.anno_list, list) { if (addresses_equal(&entry->addr, addr, false)) - return true; + return entry; } - return false; + return NULL; +} + +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(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(msk)) { + pr_debug("retransmit ADD_ADDR id=%d", entry->addr.id); + mptcp_pm_announce_addr(msk, &entry->addr, false); + entry->retrans_times++; + } + + if (entry->retrans_times < ADD_ADDR_RETRANS_MAX) + sk_reset_timer(sk, timer, jiffies + TCP_RTO_MAX); + + spin_unlock_bh(&msk->pm.lock); + +out: + __sock_put(sk); +} + +struct mptcp_pm_add_entry * +mptcp_pm_del_add_timer(struct mptcp_sock *msk, + struct mptcp_addr_info *addr) +{ + struct mptcp_pm_add_entry *entry; + struct sock *sk = (struct sock *)msk; + + spin_lock_bh(&msk->pm.lock); + entry = lookup_anno_list_by_saddr(msk, addr); + if (entry) + entry->retrans_times = ADD_ADDR_RETRANS_MAX; + spin_unlock_bh(&msk->pm.lock); + + if (entry) + sk_stop_timer_sync(sk, &entry->add_timer); + + return entry; } static bool mptcp_pm_alloc_anno_list(struct mptcp_sock *msk, struct mptcp_pm_addr_entry *entry) { struct mptcp_pm_add_entry *add_entry = NULL; + struct sock *sk = (struct sock *)msk; if (lookup_anno_list_by_saddr(msk, &entry->addr)) return false; @@ -210,21 +274,32 @@ static bool mptcp_pm_alloc_anno_list(struct mptcp_sock *msk, 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 + TCP_RTO_MAX); + 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_for_each_entry_safe(entry, tmp, &msk->pm.anno_list, list) { - list_del(&entry->list); + 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); } - spin_unlock_bh(&msk->pm.lock); } static void mptcp_pm_create_subflow_or_signal_addr(struct mptcp_sock *msk) @@ -659,14 +734,13 @@ __lookup_addr_by_id(struct pm_nl_pernet *pernet, unsigned int id) static bool remove_anno_list_by_saddr(struct mptcp_sock *msk, struct mptcp_addr_info *addr) { - struct mptcp_pm_add_entry *entry, *tmp; + struct mptcp_pm_add_entry *entry; - list_for_each_entry_safe(entry, tmp, &msk->pm.anno_list, list) { - if (addresses_equal(&entry->addr, addr, false)) { - list_del(&entry->list); - kfree(entry); - return true; - } + entry = mptcp_pm_del_add_timer(msk, addr); + if (entry) { + list_del(&entry->list); + kfree(entry); + return true; } return false; @@ -678,11 +752,12 @@ static bool mptcp_pm_remove_anno_addr(struct mptcp_sock *msk, { bool ret; - spin_lock_bh(&msk->pm.lock); ret = remove_anno_list_by_saddr(msk, addr); - if (ret || force) + if (ret || force) { + spin_lock_bh(&msk->pm.lock); mptcp_pm_remove_addr(msk, addr->id); - spin_unlock_bh(&msk->pm.lock); + spin_unlock_bh(&msk->pm.lock); + } return ret; } diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h index db1e5de2fee7..7cfe52aeb2b8 100644 --- a/net/mptcp/protocol.h +++ b/net/mptcp/protocol.h @@ -444,6 +444,9 @@ void mptcp_pm_add_addr_received(struct mptcp_sock *msk, const struct mptcp_addr_info *addr); void mptcp_pm_rm_addr_received(struct mptcp_sock *msk, u8 rm_id); void mptcp_pm_free_anno_list(struct mptcp_sock *msk); +struct mptcp_pm_add_entry * +mptcp_pm_del_add_timer(struct mptcp_sock *msk, + struct mptcp_addr_info *addr); int mptcp_pm_announce_addr(struct mptcp_sock *msk, const struct mptcp_addr_info *addr,