diff mbox series

[nft,v2,2/7] mnl: mnl_set_rcvbuffer() skips buffer size update if it is too small

Message ID 20190530105529.12657-2-pablo@netfilter.org
State Changes Requested
Delegated to: Pablo Neira
Headers show
Series [nft,v2,1/7] mnl: add mnl_set_rcvbuffer() and use it | expand

Commit Message

Pablo Neira Ayuso May 30, 2019, 10:55 a.m. UTC 
Check for existing buffer size, if this is larger than the requested new
buffer size, skip the buffer size update.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 src/mnl.c | 7 +++++++
 1 file changed, 7 insertions(+)
diff mbox series

Patch

diff --git a/src/mnl.c b/src/mnl.c
index 288a887df097..a84a6a609333 100644
--- a/src/mnl.c
+++ b/src/mnl.c
@@ -235,8 +235,15 @@  static void mnl_set_sndbuffer(const struct mnl_socket *nl,
 
 static int mnl_set_rcvbuffer(const struct mnl_socket *nl, size_t bufsiz)
 {
+	size_t cur_bufsiz;
+	socklen_t len;
 	int ret;
 
+	ret = getsockopt(mnl_socket_get_fd(nl), SOL_SOCKET, SO_RCVBUF,
+			 &cur_bufsiz, &len);
+	if (cur_bufsiz > bufsiz)
+		return 0;
+
 	ret = setsockopt(mnl_socket_get_fd(nl), SOL_SOCKET, SO_RCVBUFFORCE,
 			 &bufsiz, sizeof(socklen_t));
 	if (ret < 0) {