From 18d6c58415fa9f5ec98767a2434acc8197c7f288 Mon Sep 17 00:00:00 2001 From: Erik Hugne Date: Thu, 19 Mar 2015 09:02:17 +0100 Subject: [PATCH 1/3] tipc: remove redundant call to tipc_node_remove_conn tipc_node_remove_conn may be called twice if shutdown() is called on a socket that have messages in the receive queue. Calling this function twice does no harm, but is unnecessary and we remove the redundant call. Signed-off-by: Erik Hugne Acked-by: Ying Xue Acked-by: Jon Maloy Signed-off-by: David S. Miller --- net/tipc/socket.c | 1 - 1 file changed, 1 deletion(-) diff --git a/net/tipc/socket.c b/net/tipc/socket.c index d7a6c10202e9..5bceebd81f64 100644 --- a/net/tipc/socket.c +++ b/net/tipc/socket.c @@ -2078,7 +2078,6 @@ restart: TIPC_CONN_SHUTDOWN)) tipc_link_xmit_skb(net, skb, dnode, tsk->portid); - tipc_node_remove_conn(net, dnode, tsk->portid); } else { dnode = tsk_peer_node(tsk); From 3bd88ee7a2ea19dffe384e12fe452c59d9e53c29 Mon Sep 17 00:00:00 2001 From: Erik Hugne Date: Thu, 19 Mar 2015 09:02:18 +0100 Subject: [PATCH 2/3] tipc: do not report -EHOSTUNREACH for failed local delivery Since commit 1186adf7df04 ("tipc: simplify message forwarding and rejection in socket layer") -EHOSTUNREACH is propagated back to the sending process if we fail to deliver the message to another socket local to the node. This is wrong, host unreachable should only be reported when the destination port/name does not exist in the cluster, and that check is always done before sending the message. Also, this introduces inconsistent sendmsg() behavior for local/remote destinations. Errors occurring on the receiving side should not trickle up to the sender. If message delivery fails TIPC should either discard the packet or reject it back to the sender based on the destination droppable option. Signed-off-by: Erik Hugne Acked-by: Ying Xue Acked-by: Jon Maloy Signed-off-by: David S. Miller --- net/tipc/link.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/net/tipc/link.c b/net/tipc/link.c index bc49120bfb44..8c98c4d00ad6 100644 --- a/net/tipc/link.c +++ b/net/tipc/link.c @@ -845,8 +845,10 @@ int tipc_link_xmit(struct net *net, struct sk_buff_head *list, u32 dnode, if (link) return rc; - if (likely(in_own_node(net, dnode))) - return tipc_sk_rcv(net, list); + if (likely(in_own_node(net, dnode))) { + tipc_sk_rcv(net, list); + return 0; + } __skb_queue_purge(list); return rc; From f2f8036e391eb82ee78764483f869f2feafb5da8 Mon Sep 17 00:00:00 2001 From: Erik Hugne Date: Thu, 19 Mar 2015 09:02:19 +0100 Subject: [PATCH 3/3] tipc: add support for connect() on dgram/rdm sockets Following the example of ip4_datagram_connect, we store the address in the socket structure for dgram/rdm sockets and use that as the default destination for subsequent send() calls. It is allowed to connect to any address types, and the behaviour of send() will be the same as a normal sendto() with this address provided. Binding to an AF_UNSPEC address clears the association. Signed-off-by: Erik Hugne Reviewed-by: Ying Xue Reviewed-by: Jon Maloy Signed-off-by: David S. Miller --- net/tipc/socket.c | 38 ++++++++++++++++++++++++-------------- 1 file changed, 24 insertions(+), 14 deletions(-) diff --git a/net/tipc/socket.c b/net/tipc/socket.c index 5bceebd81f64..c03a3d33806f 100644 --- a/net/tipc/socket.c +++ b/net/tipc/socket.c @@ -74,6 +74,7 @@ * @link_cong: non-zero if owner must sleep because of link congestion * @sent_unacked: # messages sent by socket, and not yet acked by peer * @rcv_unacked: # messages read by user, but not yet acked back to peer + * @remote: 'connected' peer for dgram/rdm * @node: hash table node * @rcu: rcu struct for tipc_sock */ @@ -96,6 +97,7 @@ struct tipc_sock { bool link_cong; uint sent_unacked; uint rcv_unacked; + struct sockaddr_tipc remote; struct rhash_head node; struct rcu_head rcu; }; @@ -854,22 +856,23 @@ static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz) u32 dnode, dport; struct sk_buff_head *pktchain = &sk->sk_write_queue; struct sk_buff *skb; - struct tipc_name_seq *seq = &dest->addr.nameseq; + struct tipc_name_seq *seq; struct iov_iter save; u32 mtu; long timeo; int rc; - if (unlikely(!dest)) - return -EDESTADDRREQ; - - if (unlikely((m->msg_namelen < sizeof(*dest)) || - (dest->family != AF_TIPC))) - return -EINVAL; - if (dsz > TIPC_MAX_USER_MSG_SIZE) return -EMSGSIZE; - + if (unlikely(!dest)) { + if (tsk->connected && sock->state == SS_READY) + dest = &tsk->remote; + else + return -EDESTADDRREQ; + } else if (unlikely(m->msg_namelen < sizeof(*dest)) || + dest->family != AF_TIPC) { + return -EINVAL; + } if (unlikely(sock->state != SS_READY)) { if (sock->state == SS_LISTENING) return -EPIPE; @@ -882,7 +885,7 @@ static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz) tsk->conn_instance = dest->addr.name.name.instance; } } - + seq = &dest->addr.nameseq; timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); if (dest->addrtype == TIPC_ADDR_MCAST) { @@ -1833,17 +1836,24 @@ static int tipc_connect(struct socket *sock, struct sockaddr *dest, int destlen, int flags) { struct sock *sk = sock->sk; + struct tipc_sock *tsk = tipc_sk(sk); struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest; struct msghdr m = {NULL,}; - long timeout = (flags & O_NONBLOCK) ? 0 : tipc_sk(sk)->conn_timeout; + long timeout = (flags & O_NONBLOCK) ? 0 : tsk->conn_timeout; socket_state previous; - int res; + int res = 0; lock_sock(sk); - /* For now, TIPC does not allow use of connect() with DGRAM/RDM types */ + /* DGRAM/RDM connect(), just save the destaddr */ if (sock->state == SS_READY) { - res = -EOPNOTSUPP; + if (dst->family == AF_UNSPEC) { + memset(&tsk->remote, 0, sizeof(struct sockaddr_tipc)); + tsk->connected = 0; + } else { + memcpy(&tsk->remote, dest, destlen); + tsk->connected = 1; + } goto exit; }