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dlm: use the tcp version of accept_from_sock for sctp as well 

The only difference between a few missing fixes applied to the SCTP
one is that TCP uses ->getpeername to get the remote address, while
SCTP uses kernel_getsockopt(.. SCTP_PRIMARY_ADDR).  But given that
getpeername is defined to return the primary address for sctp, there
doesn't seem to be any reason for the different way of quering the
peername, or all the code duplication.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Christoph Hellwig 2020-05-27 20:22:28 +02:00 committed by David S. Miller
parent 50ce4c099b
commit 0774dc7643
1 changed files with 3 additions and 120 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

123
fs/dlm/lowcomms.c
View File

@ -724,7 +724,7 @@ static int receive_from_sock(struct connection *con)
}
/* Listening socket is busy, accept a connection */
static int tcp_accept_from_sock(struct connection *con)
static int accept_from_sock(struct connection *con)
{
int result;
struct sockaddr_storage peeraddr;
@ -852,123 +852,6 @@ static int tcp_accept_from_sock(struct connection *con)
return result;
}
static int sctp_accept_from_sock(struct connection *con)
{
/* Check that the new node is in the lockspace */
struct sctp_prim prim;
int nodeid;
int prim_len, ret;
int addr_len;
struct connection *newcon;
struct connection *addcon;
struct socket *newsock;
mutex_lock(&connections_lock);
if (!dlm_allow_conn) {
mutex_unlock(&connections_lock);
return -1;
}
mutex_unlock(&connections_lock);
mutex_lock_nested(&con->sock_mutex, 0);
ret = kernel_accept(con->sock, &newsock, O_NONBLOCK);
if (ret < 0)
goto accept_err;
memset(&prim, 0, sizeof(struct sctp_prim));
prim_len = sizeof(struct sctp_prim);
ret = kernel_getsockopt(newsock, IPPROTO_SCTP, SCTP_PRIMARY_ADDR,
(char *)&prim, &prim_len);
if (ret < 0) {
log_print("getsockopt/sctp_primary_addr failed: %d", ret);
goto accept_err;
}
make_sockaddr(&prim.ssp_addr, 0, &addr_len);
ret = addr_to_nodeid(&prim.ssp_addr, &nodeid);
if (ret) {
unsigned char *b = (unsigned char *)&prim.ssp_addr;
log_print("reject connect from unknown addr");
print_hex_dump_bytes("ss: ", DUMP_PREFIX_NONE,
b, sizeof(struct sockaddr_storage));
goto accept_err;
}
newcon = nodeid2con(nodeid, GFP_NOFS);
if (!newcon) {
ret = -ENOMEM;
goto accept_err;
}
mutex_lock_nested(&newcon->sock_mutex, 1);
if (newcon->sock) {
struct connection *othercon = newcon->othercon;
if (!othercon) {
othercon = kmem_cache_zalloc(con_cache, GFP_NOFS);
if (!othercon) {
log_print("failed to allocate incoming socket");
mutex_unlock(&newcon->sock_mutex);
ret = -ENOMEM;
goto accept_err;
}
othercon->nodeid = nodeid;
othercon->rx_action = receive_from_sock;
mutex_init(&othercon->sock_mutex);
INIT_LIST_HEAD(&othercon->writequeue);
spin_lock_init(&othercon->writequeue_lock);
INIT_WORK(&othercon->swork, process_send_sockets);
INIT_WORK(&othercon->rwork, process_recv_sockets);
set_bit(CF_IS_OTHERCON, &othercon->flags);
}
mutex_lock_nested(&othercon->sock_mutex, 2);
if (!othercon->sock) {
newcon->othercon = othercon;
add_sock(newsock, othercon);
addcon = othercon;
mutex_unlock(&othercon->sock_mutex);
} else {
printk("Extra connection from node %d attempted\n", nodeid);
ret = -EAGAIN;
mutex_unlock(&othercon->sock_mutex);
mutex_unlock(&newcon->sock_mutex);
goto accept_err;
}
} else {
newcon->rx_action = receive_from_sock;
add_sock(newsock, newcon);
addcon = newcon;
}
log_print("connected to %d", nodeid);
mutex_unlock(&newcon->sock_mutex);
/*
* Add it to the active queue in case we got data
* between processing the accept adding the socket
* to the read_sockets list
*/
if (!test_and_set_bit(CF_READ_PENDING, &addcon->flags))
queue_work(recv_workqueue, &addcon->rwork);
mutex_unlock(&con->sock_mutex);
return 0;
accept_err:
mutex_unlock(&con->sock_mutex);
if (newsock)
sock_release(newsock);
if (ret != -EAGAIN)
log_print("error accepting connection from node: %d", ret);
return ret;
}
static void free_entry(struct writequeue_entry *e)
{
__free_page(e->page);
@ -1253,7 +1136,7 @@ static struct socket *tcp_create_listen_sock(struct connection *con,
write_lock_bh(&sock->sk->sk_callback_lock);
sock->sk->sk_user_data = con;
save_listen_callbacks(sock);
con->rx_action = tcp_accept_from_sock;
con->rx_action = accept_from_sock;
con->connect_action = tcp_connect_to_sock;
write_unlock_bh(&sock->sk->sk_callback_lock);
@ -1340,7 +1223,7 @@ static int sctp_listen_for_all(void)
save_listen_callbacks(sock);
con->sock = sock;
con->sock->sk->sk_data_ready = lowcomms_data_ready;
con->rx_action = sctp_accept_from_sock;
con->rx_action = accept_from_sock;
con->connect_action = sctp_connect_to_sock;
write_unlock_bh(&sock->sk->sk_callback_lock);