From 76c6d988aeb3c15d57ea0c245a3b5f27802c1fbe Mon Sep 17 00:00:00 2001 From: Xin Long Date: Mon, 12 Nov 2018 18:27:16 +0800 Subject: sctp: add sock_reuseport for the sock in __sctp_hash_endpoint This is a part of sk_reuseport support for sctp. It defines a helper sctp_bind_addrs_check() to check if the bind_addrs in two socks are matched. It will add sock_reuseport if they are completely matched, and return err if they are partly matched, and alloc sock_reuseport if all socks are not matched at all. It will work until sk_reuseport support is added in sctp_get_port_local() in the next patch. v1->v2: - use 'laddr->valid && laddr2->valid' check instead as Marcelo pointed in sctp_bind_addrs_check(). Acked-by: Neil Horman Signed-off-by: Xin Long Signed-off-by: David S. Miller --- net/sctp/input.c | 60 ++++++++++++++++++++++++++++++++++++++++++++++++-------- 1 file changed, 52 insertions(+), 8 deletions(-) (limited to 'net/sctp/input.c') diff --git a/net/sctp/input.c b/net/sctp/input.c index 00f995e37795..d7a649d240e5 100644 --- a/net/sctp/input.c +++ b/net/sctp/input.c @@ -724,43 +724,87 @@ discard: } /* Insert endpoint into the hash table. */ -static void __sctp_hash_endpoint(struct sctp_endpoint *ep) +static int __sctp_hash_endpoint(struct sctp_endpoint *ep) { - struct net *net = sock_net(ep->base.sk); - struct sctp_ep_common *epb; + struct sock *sk = ep->base.sk; + struct net *net = sock_net(sk); struct sctp_hashbucket *head; + struct sctp_ep_common *epb; epb = &ep->base; - epb->hashent = sctp_ep_hashfn(net, epb->bind_addr.port); head = &sctp_ep_hashtable[epb->hashent]; + if (sk->sk_reuseport) { + bool any = sctp_is_ep_boundall(sk); + struct sctp_ep_common *epb2; + struct list_head *list; + int cnt = 0, err = 1; + + list_for_each(list, &ep->base.bind_addr.address_list) + cnt++; + + sctp_for_each_hentry(epb2, &head->chain) { + struct sock *sk2 = epb2->sk; + + if (!net_eq(sock_net(sk2), net) || sk2 == sk || + !uid_eq(sock_i_uid(sk2), sock_i_uid(sk)) || + !sk2->sk_reuseport) + continue; + + err = sctp_bind_addrs_check(sctp_sk(sk2), + sctp_sk(sk), cnt); + if (!err) { + err = reuseport_add_sock(sk, sk2, any); + if (err) + return err; + break; + } else if (err < 0) { + return err; + } + } + + if (err) { + err = reuseport_alloc(sk, any); + if (err) + return err; + } + } + write_lock(&head->lock); hlist_add_head(&epb->node, &head->chain); write_unlock(&head->lock); + return 0; } /* Add an endpoint to the hash. Local BH-safe. */ -void sctp_hash_endpoint(struct sctp_endpoint *ep) +int sctp_hash_endpoint(struct sctp_endpoint *ep) { + int err; + local_bh_disable(); - __sctp_hash_endpoint(ep); + err = __sctp_hash_endpoint(ep); local_bh_enable(); + + return err; } /* Remove endpoint from the hash table. */ static void __sctp_unhash_endpoint(struct sctp_endpoint *ep) { - struct net *net = sock_net(ep->base.sk); + struct sock *sk = ep->base.sk; struct sctp_hashbucket *head; struct sctp_ep_common *epb; epb = &ep->base; - epb->hashent = sctp_ep_hashfn(net, epb->bind_addr.port); + epb->hashent = sctp_ep_hashfn(sock_net(sk), epb->bind_addr.port); head = &sctp_ep_hashtable[epb->hashent]; + if (rcu_access_pointer(sk->sk_reuseport_cb)) + reuseport_detach_sock(sk); + write_lock(&head->lock); hlist_del_init(&epb->node); write_unlock(&head->lock); -- cgit v1.2.3