diff options
| author | Jon Maloy <jon.maloy@ericsson.com> | 2018-09-28 20:23:21 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-09-29 20:24:22 +0200 |
| commit | 25b9221b959483f17c2964d0922869e16caa86b5 (patch) | |
| tree | efe153ded226c9b0046ff7612fa90fb0883e93b2 /net/tipc/socket.c | |
| parent | tipc: refactor function tipc_sk_filter_connect() (diff) | |
| download | linux-25b9221b959483f17c2964d0922869e16caa86b5.tar.xz linux-25b9221b959483f17c2964d0922869e16caa86b5.zip | |
tipc: add SYN bit to connection setup messages
Messages intended for intitating a connection are currently
indistinguishable from regular datagram messages. The TIPC
protocol specification defines bit 17 in word 0 as a SYN bit
to allow sanity check of such messages in the listening socket,
but this has so far never been implemented.
We do that in this commit.
Acked-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/tipc/socket.c')
| -rw-r--r-- | net/tipc/socket.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/net/tipc/socket.c b/net/tipc/socket.c index 094cfdc1e2b6..89d6dc0f456d 100644 --- a/net/tipc/socket.c +++ b/net/tipc/socket.c @@ -1319,6 +1319,7 @@ static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dlen) tsk->conn_type = dest->addr.name.name.type; tsk->conn_instance = dest->addr.name.name.instance; } + msg_set_syn(hdr, 1); } seq = &dest->addr.nameseq; @@ -1478,6 +1479,7 @@ static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port, struct net *net = sock_net(sk); struct tipc_msg *msg = &tsk->phdr; + msg_set_syn(msg, 0); msg_set_destnode(msg, peer_node); msg_set_destport(msg, peer_port); msg_set_type(msg, TIPC_CONN_MSG); @@ -2006,6 +2008,9 @@ static bool tipc_sk_filter_connect(struct tipc_sock *tsk, struct sk_buff *skb) return false; case TIPC_LISTEN: /* Accept only SYN message */ + if (!msg_is_syn(hdr) && + tipc_node_get_capabilities(net, onode) & TIPC_SYN_BIT) + return false; if (!con_msg && !err) return true; return false; |