tipc: let function tipc_msg_reverse() expand header when needed
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>
diff --git a/net/tipc/msg.c b/net/tipc/msg.c
index 08b4cc7..4339aab 100644
--- a/net/tipc/msg.c
+++ b/net/tipc/msg.c
@@ -463,43 +463,58 @@
/**
* tipc_msg_reverse(): swap source and destination addresses and add error code
- * @buf: buffer containing message to be reversed
- * @dnode: return value: node where to send message after reversal
- * @err: error code to be set in message
- * Consumes buffer if failure
+ * @own_node: originating node id for reversed message
+ * @skb: buffer containing message to be reversed; may be replaced.
+ * @err: error code to be set in message, if any
+ * Consumes buffer at failure
* Returns true if success, otherwise false
*/
-bool tipc_msg_reverse(u32 own_addr, struct sk_buff *buf, u32 *dnode,
- int err)
+bool tipc_msg_reverse(u32 own_node, struct sk_buff **skb, u32 *dnode, int err)
{
- struct tipc_msg *msg = buf_msg(buf);
+ struct sk_buff *_skb = *skb;
+ struct tipc_msg *hdr = buf_msg(_skb);
struct tipc_msg ohdr;
- uint rdsz = min_t(uint, msg_data_sz(msg), MAX_FORWARD_SIZE);
+ int dlen = min_t(uint, msg_data_sz(hdr), MAX_FORWARD_SIZE);
- if (skb_linearize(buf))
+ if (skb_linearize(_skb))
goto exit;
- msg = buf_msg(buf);
- if (msg_dest_droppable(msg))
+ hdr = buf_msg(_skb);
+ if (msg_dest_droppable(hdr))
goto exit;
- if (msg_errcode(msg))
+ if (msg_errcode(hdr))
goto exit;
- memcpy(&ohdr, msg, msg_hdr_sz(msg));
- msg_set_errcode(msg, err);
- msg_set_origport(msg, msg_destport(&ohdr));
- msg_set_destport(msg, msg_origport(&ohdr));
- msg_set_prevnode(msg, own_addr);
- if (!msg_short(msg)) {
- msg_set_orignode(msg, msg_destnode(&ohdr));
- msg_set_destnode(msg, msg_orignode(&ohdr));
+
+ /* Take a copy of original header before altering message */
+ memcpy(&ohdr, hdr, msg_hdr_sz(hdr));
+
+ /* Never return SHORT header; expand by replacing buffer if necessary */
+ if (msg_short(hdr)) {
+ *skb = tipc_buf_acquire(BASIC_H_SIZE + dlen);
+ if (!*skb)
+ goto exit;
+ memcpy((*skb)->data + BASIC_H_SIZE, msg_data(hdr), dlen);
+ kfree_skb(_skb);
+ _skb = *skb;
+ hdr = buf_msg(_skb);
+ memcpy(hdr, &ohdr, BASIC_H_SIZE);
+ msg_set_hdr_sz(hdr, BASIC_H_SIZE);
}
- msg_set_size(msg, msg_hdr_sz(msg) + rdsz);
- skb_trim(buf, msg_size(msg));
- skb_orphan(buf);
- *dnode = msg_orignode(&ohdr);
+
+ /* Now reverse the concerned fields */
+ msg_set_errcode(hdr, err);
+ msg_set_origport(hdr, msg_destport(&ohdr));
+ msg_set_destport(hdr, msg_origport(&ohdr));
+ msg_set_destnode(hdr, msg_prevnode(&ohdr));
+ msg_set_prevnode(hdr, own_node);
+ msg_set_orignode(hdr, own_node);
+ msg_set_size(hdr, msg_hdr_sz(hdr) + dlen);
+ *dnode = msg_destnode(hdr);
+ skb_trim(_skb, msg_size(hdr));
+ skb_orphan(_skb);
return true;
exit:
- kfree_skb(buf);
- *dnode = 0;
+ kfree_skb(_skb);
+ *skb = NULL;
return false;
}
diff --git a/net/tipc/msg.h b/net/tipc/msg.h
index 2f1563b..0e96f59 100644
--- a/net/tipc/msg.h
+++ b/net/tipc/msg.h
@@ -785,8 +785,7 @@
struct sk_buff *tipc_buf_acquire(u32 size);
bool tipc_msg_validate(struct sk_buff *skb);
-bool tipc_msg_reverse(u32 own_addr, struct sk_buff *buf, u32 *dnode,
- int err);
+bool tipc_msg_reverse(u32 own_addr, struct sk_buff **skb, u32 *dnode, int err);
void tipc_msg_init(u32 own_addr, struct tipc_msg *m, u32 user, u32 type,
u32 hsize, u32 destnode);
struct sk_buff *tipc_msg_create(uint user, uint type, uint hdr_sz,
diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index 5b0b08d..e2d5b98 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -260,7 +260,7 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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);