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Save previous connected client address

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Our connection state spans sockets that can disconnect and reconnect.
While sockets are connected we store the socket's remote address in the
connection's peername and we clear it as sockets disconnect.

Fencing wants to know the last connected address of the mount.  It's a
bit of metadata we know about the mount that can be used to find it and
fence it.  As we store the peer address we also stash it away as the
last known peer address for the socket.  Fencing can then use that
instead of the current socket peer address which is guaranteed to be
uninitialized because there's no socket connected.

Signed-off-by: Zach Brown <zab@versity.com>
This commit is contained in:
Zach Brown
2021-03-15 10:50:05 -07:00
parent 9ebc9d0f66
commit f3764b873b
2 changed files with 6 additions and 2 deletions
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7
kmod/src/net.c
View File

@@ -941,6 +941,8 @@ static int sock_opts_and_names(struct scoutfs_net_connection *conn,
ret = -EAFNOSUPPORT;
if (ret)
goto out;
conn->last_peername = conn->peername;
out:
return ret;
}
@@ -1237,9 +1239,9 @@ restart:
spin_unlock(&conn->lock);
if (!test_conn_fl(conn, shutting_down)) {
scoutfs_info(sb, "client "SIN_FMT" reconnect timed out, fencing",
SIN_ARG(&acc->peername));
SIN_ARG(&acc->last_peername));
ret = scoutfs_fence_start(sb, acc->rid,
acc->peername.sin_addr.s_addr,
acc->last_peername.sin_addr.s_addr,
SCOUTFS_FENCE_CLIENT_RECONNECT);
if (ret) {
scoutfs_err(sb, "client fence returned err %d, shutting down server",
@@ -1317,6 +1319,7 @@ scoutfs_net_alloc_conn(struct super_block *sb,
init_waitqueue_head(&conn->waitq);
conn->sockname.sin_family = AF_INET;
conn->peername.sin_family = AF_INET;
conn->last_peername.sin_family = AF_INET;
INIT_LIST_HEAD(&conn->accepted_head);
INIT_LIST_HEAD(&conn->accepted_list);
conn->next_send_seq = 1;

1
kmod/src/net.h
View File

@@ -49,6 +49,7 @@ struct scoutfs_net_connection {
u64 greeting_id;
struct sockaddr_in sockname;
struct sockaddr_in peername;
struct sockaddr_in last_peername;
struct list_head accepted_head;
struct scoutfs_net_connection *listening_conn;