In tap_handler() if we get an error on the tap device or socket, we use
tap_sock_init() to re-initialise it. However, what we actually need for
this reset case has remarkably little in common with the case where we're
initialising for the first time:
* Re-initialising the packet pools is unnecessary
* The case of a passed in fd (--fd) isn't relevant
* We don't even call this for pasta mode
* We will never re-call tap_sock_unix_init() because we never clear
fd_tap_listen
In fact the only thing we do in tap_sock_init() relevant to the reset case
is to remove the fd from the epoll and close it... which isn't used in the
first initialisation case.
So make a new tap_sock_reset() function just for this case, and simplify
tap_sock_init() slightly as being used only for the first time case.
Signed-off-by: David Gibson <david(a)gibson.dropbear.id.au>
---
tap.c | 52 +++++++++++++++++++++++++++++-----------------------
1 file changed, 29 insertions(+), 23 deletions(-)
diff --git a/tap.c b/tap.c
index a6a73d3..3a43263 100644
--- a/tap.c
+++ b/tap.c
@@ -1233,19 +1233,14 @@ void tap_sock_init(struct ctx *c)
tap6_l4[i].p = PACKET_INIT(pool_l4, TAP_SEQS, pkt_buf, sz);
}
- if (c->fd_tap != -1) {
- if (c->one_off) { /* Passed as --fd */
- struct epoll_event ev = { 0 };
-
- ev.data.fd = c->fd_tap;
- ev.events = EPOLLIN | EPOLLET | EPOLLRDHUP;
- epoll_ctl(c->epollfd, EPOLL_CTL_ADD, c->fd_tap, &ev);
- return;
- }
+ if (c->fd_tap != -1) { /* Passed as --fd */
+ struct epoll_event ev = { 0 };
+ ASSERT(c->one_off);
- epoll_ctl(c->epollfd, EPOLL_CTL_DEL, c->fd_tap, NULL);
- close(c->fd_tap);
- c->fd_tap = -1;
+ ev.data.fd = c->fd_tap;
+ ev.events = EPOLLIN | EPOLLET | EPOLLRDHUP;
+ epoll_ctl(c->epollfd, EPOLL_CTL_ADD, c->fd_tap, &ev);
+ return;
}
if (c->mode == MODE_PASST) {
@@ -1256,6 +1251,26 @@ void tap_sock_init(struct ctx *c)
}
}
+/**
+ * tap_sock_reset() - Handle closing or failure of connect AF_UNIX socket
+ * @c: Execution context
+ */
+static void tap_sock_reset(struct ctx *c)
+{
+ if (c->one_off) {
+ info("Client closed connection, exiting");
+ exit(EXIT_SUCCESS);
+ }
+
+ if (c->mode == MODE_PASTA)
+ die("Error on tap device, exiting");
+
+ /* Close the connected socket, wait for a new connection */
+ epoll_ctl(c->epollfd, EPOLL_CTL_DEL, c->fd_tap, NULL);
+ close(c->fd_tap);
+ c->fd_tap = -1;
+}
+
/**
* tap_handler() - Packet handler for AF_UNIX or tuntap file descriptor
* @c: Execution context
@@ -1273,15 +1288,6 @@ void tap_handler(struct ctx *c, int fd, uint32_t events,
if ((c->mode == MODE_PASST && tap_handler_passt(c, now)) ||
(c->mode == MODE_PASTA && tap_handler_pasta(c, now)) ||
- (events & (EPOLLRDHUP | EPOLLHUP | EPOLLERR))) {
- if (c->one_off) {
- info("Client closed connection, exiting");
- exit(EXIT_SUCCESS);
- }
-
- if (c->mode == MODE_PASTA)
- die("Error on tap device, exiting");
-
- tap_sock_init(c);
- }
+ (events & (EPOLLRDHUP | EPOLLHUP | EPOLLERR)))
+ tap_sock_reset(c);
}
--
2.41.0