We call tap_sock_reset() if tap_handler_passt() fails, or if we get an
error event on the socket. Fold that logic into tap_handler() passt itself
which simplifies the caller. It also makes it clearer that we had a
redundant EPOLL_CTL_DEL and close() in one of the reset paths, so fix that
too.
Signed-off-by: David Gibson <david(a)gibson.dropbear.id.au>
---
tap.c | 68 ++++++++++++++++++++++++++++-------------------------------
1 file changed, 32 insertions(+), 36 deletions(-)
diff --git a/tap.c b/tap.c
index d717bc2..3777de8 100644
--- a/tap.c
+++ b/tap.c
@@ -891,19 +891,41 @@ append:
return in->count;
}
+/**
+ * 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);
+ }
+
+ /* 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_passt() - Packet handler for AF_UNIX file descriptor
* @c: Execution context
+ * @events: epoll events
* @now: Current timestamp
- *
- * Return: -ECONNRESET on receive error, 0 otherwise
*/
-static int tap_handler_passt(struct ctx *c, const struct timespec *now)
+static void tap_handler_passt(struct ctx *c, uint32_t events,
+ const struct timespec *now)
{
struct ethhdr *eh;
ssize_t n, rem;
char *p;
+ if (events & (EPOLLRDHUP | EPOLLHUP | EPOLLERR)) {
+ tap_sock_reset(c);
+ return;
+ }
+
redo:
p = pkt_buf;
rem = 0;
@@ -913,13 +935,9 @@ redo:
n = recv(c->fd_tap, p, TAP_BUF_FILL, MSG_DONTWAIT);
if (n < 0) {
- if (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK)
- return 0;
-
- epoll_ctl(c->epollfd, EPOLL_CTL_DEL, c->fd_tap, NULL);
- close(c->fd_tap);
-
- return -ECONNRESET;
+ if (errno != EINTR && errno != EAGAIN && errno != EWOULDBLOCK)
+ tap_sock_reset(c);
+ return;
}
while (n > (ssize_t)sizeof(uint32_t)) {
@@ -934,7 +952,7 @@ redo:
if (len > n) {
rem = recv(c->fd_tap, p + n, len - n, 0);
if ((n += rem) != len)
- return 0;
+ return;
}
/* Complete the partial read above before discarding a malformed
@@ -975,8 +993,6 @@ next:
/* We can't use EPOLLET otherwise. */
if (rem)
goto redo;
-
- return 0;
}
/**
@@ -1258,23 +1274,6 @@ 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);
- }
-
- /* 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
@@ -1290,11 +1289,8 @@ void tap_handler(struct ctx *c, int fd, uint32_t events,
return;
}
- if (c->mode == MODE_PASST) {
- if (tap_handler_passt(c, now) ||
- (events & (EPOLLRDHUP | EPOLLHUP | EPOLLERR)))
- tap_sock_reset(c);
- } else if (c->mode == MODE_PASTA) {
+ if (c->mode == MODE_PASST)
+ tap_handler_passt(c, events, now);
+ else if (c->mode == MODE_PASTA)
tap_handler_pasta(c, events, now);
- }
}
--
2.41.0