From: Pablo Neira Ayuso <pablo@netfilter.org>
To: netfilter-devel@vger.kernel.org
Cc: phil@nwl.cc
Subject: [PATCH nft 2/7,v4] mnl: mnl_set_rcvbuffer() skips buffer size update if it is too small
Date: Fri, 31 May 2019 12:20:03 +0200 [thread overview]
Message-ID: <20190531102003.19648-1-pablo@netfilter.org> (raw)
Check for existing buffer size, if this is larger than the newer buffer
size, skip this size update.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
src/mnl.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/src/mnl.c b/src/mnl.c
index 288a887df097..859c7d770748 100644
--- a/src/mnl.c
+++ b/src/mnl.c
@@ -233,10 +233,21 @@ static void mnl_set_sndbuffer(const struct mnl_socket *nl,
nlbuffsiz = newbuffsiz;
}
+static unsigned int nlsndbufsiz;
+
static int mnl_set_rcvbuffer(const struct mnl_socket *nl, size_t bufsiz)
{
+ socklen_t len = sizeof(nlsndbufsiz);
int ret;
+ if (!nlsndbufsiz) {
+ getsockopt(mnl_socket_get_fd(nl), SOL_SOCKET, SO_RCVBUF,
+ &nlsndbufsiz, &len);
+ }
+
+ if (nlsndbufsiz >= bufsiz)
+ return 0;
+
ret = setsockopt(mnl_socket_get_fd(nl), SOL_SOCKET, SO_RCVBUFFORCE,
&bufsiz, sizeof(socklen_t));
if (ret < 0) {
--
2.11.0
reply other threads:[~2019-05-31 10:20 UTC|newest]
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