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tipc: let function tipc_msg_reverse() expand header when needed

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The shortest TIPC message header, for cluster local CONNECTED messages,
is 24 bytes long. With this format, the fields "dest_node" and
"orig_node" are optimized away, since they in reality are redundant
in this particular case.

However, the absence of these fields leads to code inconsistencies
that are difficult to handle in some cases, especially when we need
to reverse or reject messages at the socket layer.

In this commit, we concentrate the handling of the absent fields
to one place, by letting the function tipc_msg_reverse() reallocate
the buffer and expand the header to 32 bytes when necessary. This
means that the socket code now can assume that the two previously
absent fields are present in the header when a message needs to be
rejected. This opens up for some further simplifications of the
socket code.

Reviewed-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>
This commit is contained in:
Jon Paul Maloy
2015-07-22 10:11:18 -04:00
committed by David S. Miller
parent a69e5a0dcf
commit 29042e19f2
3 changed files with 48 additions and 34 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
net/tipc/socket.c
View File

@@ -260,7 +260,7 @@ static void tsk_rej_rx_queue(struct sock *sk)
u32 own_node = tsk_own_node(tipc_sk(sk));
while ((skb = __skb_dequeue(&sk->sk_receive_queue))) {
if (tipc_msg_reverse(own_node, skb, &dnode, TIPC_ERR_NO_PORT))
if (tipc_msg_reverse(own_node, &skb, &dnode, TIPC_ERR_NO_PORT))
tipc_node_xmit_skb(sock_net(sk), skb, dnode, 0);
}
}
@@ -441,7 +441,7 @@ static int tipc_release(struct socket *sock)
tsk->connected = 0;
tipc_node_remove_conn(net, dnode, tsk->portid);
}
if (tipc_msg_reverse(tsk_own_node(tsk), skb, &dnode,
if (tipc_msg_reverse(tsk_own_node(tsk), &skb, &dnode,
TIPC_ERR_NO_PORT))
tipc_node_xmit_skb(net, skb, dnode, 0);
}
@@ -784,7 +784,7 @@ static void tipc_sk_proto_rcv(struct tipc_sock *tsk, struct sk_buff **skb)
if (conn_cong)
tsk->sk.sk_write_space(&tsk->sk);
} else if (msg_type(msg) == CONN_PROBE) {
if (tipc_msg_reverse(own_node, *skb, &dnode, TIPC_OK)) {
if (tipc_msg_reverse(own_node, skb, &dnode, TIPC_OK)) {
msg_set_type(msg, CONN_PROBE_REPLY);
return;
}
@@ -1702,7 +1702,7 @@ static int tipc_backlog_rcv(struct sock *sk, struct sk_buff *skb)
atomic_add(truesize, dcnt);
return 0;
}
if (!err || tipc_msg_reverse(tsk_own_node(tsk), skb, &dnode, -err))
if (!err || tipc_msg_reverse(tsk_own_node(tsk), &skb, &dnode, -err))
tipc_node_xmit_skb(net, skb, dnode, tsk->portid);
return 0;
}
@@ -1796,7 +1796,7 @@ int tipc_sk_rcv(struct net *net, struct sk_buff_head *inputq)
goto xmit;
}
tn = net_generic(net, tipc_net_id);
if (!tipc_msg_reverse(tn->own_addr, skb, &dnode, -err))
if (!tipc_msg_reverse(tn->own_addr, &skb, &dnode, -err))
continue;
xmit:
tipc_node_xmit_skb(net, skb, dnode, dport);
@@ -2090,7 +2090,7 @@ restart:
kfree_skb(skb);
goto restart;
}
if (tipc_msg_reverse(tsk_own_node(tsk), skb, &dnode,
if (tipc_msg_reverse(tsk_own_node(tsk), &skb, &dnode,
TIPC_CONN_SHUTDOWN))
tipc_node_xmit_skb(net, skb, dnode,
tsk->portid);