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tipc: introduce new tipc_sk_respond() function 

Currently, we use the code sequence

if (msg_reverse())
   tipc_link_xmit_skb()

at numerous locations in socket.c. The preparation of arguments
for these calls, as well as the sequence itself, makes the code
unecessarily complex.

In this commit, we introduce a new function, tipc_sk_respond(),
that performs this call combination. We also replace some, but not
yet all, of these explicit call sequences with calls to the new
function. Notably, we let the function tipc_sk_proto_rcv() use
the new function to directly send out PROBE_REPLY messages,
instead of deferring this to the calling tipc_sk_rcv() function,
as we do now.

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 10:11:19 -04:00 committed by David S. Miller
parent 29042e19f2
commit bcd3ffd4f6
3 changed files with 47 additions and 39 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
net/tipc/msg.c
View File

@ -469,7 +469,7 @@ bool tipc_msg_make_bundle(struct sk_buff **skb, struct tipc_msg *msg,
* Consumes buffer at failure
* Returns true if success, otherwise false
*/
bool tipc_msg_reverse(u32 own_node, struct sk_buff **skb, u32 *dnode, int err)
bool tipc_msg_reverse(u32 own_node, struct sk_buff **skb, int err)
{
struct sk_buff *_skb = *skb;
struct tipc_msg *hdr = buf_msg(_skb);
@ -508,7 +508,6 @@ bool tipc_msg_reverse(u32 own_node, struct sk_buff **skb, u32 *dnode, int err)
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;

2
net/tipc/msg.h
View File

@ -785,7 +785,7 @@ static inline bool msg_peer_is_up(struct tipc_msg *m)
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 **skb, u32 *dnode, int err);
bool tipc_msg_reverse(u32 own_addr, struct sk_buff **skb, 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,

81
net/tipc/socket.c
View File

@ -248,6 +248,22 @@ static void tsk_advance_rx_queue(struct sock *sk)
kfree_skb(__skb_dequeue(&sk->sk_receive_queue));
}
/* tipc_sk_respond() : send response message back to sender
*/
static void tipc_sk_respond(struct sock *sk, struct sk_buff *skb, int err)
{
u32 selector;
u32 dnode;
u32 onode = tipc_own_addr(sock_net(sk));
if (!tipc_msg_reverse(onode, &skb, err))
return;
dnode = msg_destnode(buf_msg(skb));
selector = msg_origport(buf_msg(skb));
tipc_node_xmit_skb(sock_net(sk), skb, dnode, selector);
}
/**
* tsk_rej_rx_queue - reject all buffers in socket receive queue
*
@ -256,13 +272,9 @@ static void tsk_advance_rx_queue(struct sock *sk)
static void tsk_rej_rx_queue(struct sock *sk)
{
struct sk_buff *skb;
u32 dnode;
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))
tipc_node_xmit_skb(sock_net(sk), skb, dnode, 0);
}
while ((skb = __skb_dequeue(&sk->sk_receive_queue)))
tipc_sk_respond(sk, skb, TIPC_ERR_NO_PORT);
}
/* tsk_peer_msg - verify if message was sent by connected port's peer
@ -441,9 +453,7 @@ 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,
TIPC_ERR_NO_PORT))
tipc_node_xmit_skb(net, skb, dnode, 0);
tipc_sk_respond(sk, skb, TIPC_ERR_NO_PORT);
}
}
@ -764,35 +774,35 @@ void tipc_sk_mcast_rcv(struct net *net, struct sk_buff_head *arrvq,
/**
* tipc_sk_proto_rcv - receive a connection mng protocol message
* @tsk: receiving socket
* @skb: pointer to message buffer. Set to NULL if buffer is consumed.
* @skb: pointer to message buffer.
*/
static void tipc_sk_proto_rcv(struct tipc_sock *tsk, struct sk_buff **skb)
static void tipc_sk_proto_rcv(struct tipc_sock *tsk, struct sk_buff *skb)
{
struct tipc_msg *msg = buf_msg(*skb);
struct sock *sk = &tsk->sk;
struct tipc_msg *hdr = buf_msg(skb);
int mtyp = msg_type(hdr);
int conn_cong;
u32 dnode;
u32 own_node = tsk_own_node(tsk);
/* Ignore if connection cannot be validated: */
if (!tsk_peer_msg(tsk, msg))
if (!tsk_peer_msg(tsk, hdr))
goto exit;
tsk->probing_state = TIPC_CONN_OK;
if (msg_type(msg) == CONN_ACK) {
if (mtyp == CONN_PROBE) {
msg_set_type(hdr, CONN_PROBE_REPLY);
tipc_sk_respond(sk, skb, TIPC_OK);
return;
} else if (mtyp == CONN_ACK) {
conn_cong = tsk_conn_cong(tsk);
tsk->sent_unacked -= msg_msgcnt(msg);
tsk->sent_unacked -= msg_msgcnt(hdr);
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)) {
msg_set_type(msg, CONN_PROBE_REPLY);
return;
}
sk->sk_write_space(sk);
} else if (mtyp != CONN_PROBE_REPLY) {
pr_warn("Received unknown CONN_PROTO msg\n");
}
/* Do nothing if msg_type() == CONN_PROBE_REPLY */
exit:
kfree_skb(*skb);
*skb = NULL;
kfree_skb(skb);
}
static int tipc_wait_for_sndmsg(struct socket *sock, long *timeo_p)
@ -1638,7 +1648,7 @@ static int filter_rcv(struct sock *sk, struct sk_buff **skb)
int rc = TIPC_OK;
if (unlikely(msg_user(msg) == CONN_MANAGER)) {
tipc_sk_proto_rcv(tsk, skb);
tipc_sk_proto_rcv(tsk, *skb);
return TIPC_OK;
}
@ -1690,7 +1700,7 @@ static int tipc_backlog_rcv(struct sock *sk, struct sk_buff *skb)
{
int err;
atomic_t *dcnt;
u32 dnode;
u32 dnode = msg_prevnode(buf_msg(skb));
struct tipc_sock *tsk = tipc_sk(sk);
struct net *net = sock_net(sk);
uint truesize = skb->truesize;
@ -1702,7 +1712,7 @@ 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, -err))
tipc_node_xmit_skb(net, skb, dnode, tsk->portid);
return 0;
}
@ -1794,9 +1804,11 @@ int tipc_sk_rcv(struct net *net, struct sk_buff_head *inputq)
if (!err) {
dnode = msg_destnode(buf_msg(skb));
goto xmit;
} else {
dnode = msg_prevnode(buf_msg(skb));
}
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, -err))
continue;
xmit:
tipc_node_xmit_skb(net, skb, dnode, dport);
@ -2083,6 +2095,8 @@ static int tipc_shutdown(struct socket *sock, int how)
case SS_CONNECTED:
restart:
dnode = tsk_peer_node(tsk);
/* Disconnect and send a 'FIN+' or 'FIN-' message to peer */
skb = __skb_dequeue(&sk->sk_receive_queue);
if (skb) {
@ -2090,13 +2104,8 @@ restart:
kfree_skb(skb);
goto restart;
}
if (tipc_msg_reverse(tsk_own_node(tsk), &skb, &dnode,
TIPC_CONN_SHUTDOWN))
tipc_node_xmit_skb(net, skb, dnode,
tsk->portid);
tipc_sk_respond(sk, skb, TIPC_CONN_SHUTDOWN);
} else {
dnode = tsk_peer_node(tsk);
skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE,
TIPC_CONN_MSG, SHORT_H_SIZE,
0, dnode, tsk_own_node(tsk),