* [PATCH nft,v3 2/7] mnl: mnl_set_rcvbuffer() skips buffer size update if it is too small
@ 2019-05-30 11:12 Pablo Neira Ayuso
2019-05-31 9:30 ` Phil Sutter
0 siblings, 1 reply; 3+ messages in thread
From: Pablo Neira Ayuso @ 2019-05-30 11:12 UTC (permalink / raw)
To: netfilter-devel; +Cc: phil
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>
---
v3: 'len' variable was not properly set.
src/mnl.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/src/mnl.c b/src/mnl.c
index 288a887df097..2270a084ad29 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)
{
+ unsigned int cur_bufsiz;
+ socklen_t len = sizeof(cur_bufsiz);
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) {
--
2.11.0
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH nft,v3 2/7] mnl: mnl_set_rcvbuffer() skips buffer size update if it is too small
2019-05-30 11:12 [PATCH nft,v3 2/7] mnl: mnl_set_rcvbuffer() skips buffer size update if it is too small Pablo Neira Ayuso
@ 2019-05-31 9:30 ` Phil Sutter
2019-05-31 9:59 ` Pablo Neira Ayuso
0 siblings, 1 reply; 3+ messages in thread
From: Phil Sutter @ 2019-05-31 9:30 UTC (permalink / raw)
To: Pablo Neira Ayuso; +Cc: netfilter-devel
Hi Pablo,
On Thu, May 30, 2019 at 01:12:46PM +0200, Pablo Neira Ayuso wrote:
> 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>
> ---
> v3: 'len' variable was not properly set.
>
> src/mnl.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/src/mnl.c b/src/mnl.c
> index 288a887df097..2270a084ad29 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)
> {
> + unsigned int cur_bufsiz;
> + socklen_t len = sizeof(cur_bufsiz);
> int ret;
>
> + ret = getsockopt(mnl_socket_get_fd(nl), SOL_SOCKET, SO_RCVBUF,
> + &cur_bufsiz, &len);
> + if (cur_bufsiz > bufsiz)
> + return 0;
> +
For mnl_set_sndbuffer(), there is simply a global static variable
holding the last set value. Can't we use that here as well? I think of
something like:
+ 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)
+ ret = getsockopt(mnl_socket_get_fd(nl), SOL_SOCKET, SO_RCVBUF,
+ &nlsndbufsiz, &len);
+ if (nlsndbufsiz >= bufsiz)
+ return 0;
Cheers, Phil
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH nft,v3 2/7] mnl: mnl_set_rcvbuffer() skips buffer size update if it is too small
2019-05-31 9:30 ` Phil Sutter
@ 2019-05-31 9:59 ` Pablo Neira Ayuso
0 siblings, 0 replies; 3+ messages in thread
From: Pablo Neira Ayuso @ 2019-05-31 9:59 UTC (permalink / raw)
To: Phil Sutter, netfilter-devel
On Fri, May 31, 2019 at 11:30:12AM +0200, Phil Sutter wrote:
> Hi Pablo,
>
> On Thu, May 30, 2019 at 01:12:46PM +0200, Pablo Neira Ayuso wrote:
> > 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>
> > ---
> > v3: 'len' variable was not properly set.
> >
> > src/mnl.c | 7 +++++++
> > 1 file changed, 7 insertions(+)
> >
> > diff --git a/src/mnl.c b/src/mnl.c
> > index 288a887df097..2270a084ad29 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)
> > {
> > + unsigned int cur_bufsiz;
> > + socklen_t len = sizeof(cur_bufsiz);
> > int ret;
> >
> > + ret = getsockopt(mnl_socket_get_fd(nl), SOL_SOCKET, SO_RCVBUF,
> > + &cur_bufsiz, &len);
> > + if (cur_bufsiz > bufsiz)
> > + return 0;
> > +
>
> For mnl_set_sndbuffer(), there is simply a global static variable
> holding the last set value. Can't we use that here as well? I think of
> something like:
>
> + 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)
> + ret = getsockopt(mnl_socket_get_fd(nl), SOL_SOCKET, SO_RCVBUF,
> + &nlsndbufsiz, &len);
> + if (nlsndbufsiz >= bufsiz)
> + return 0;
Yes, I'm going to send a v4 including this change you propose.
Thanks!
^ permalink raw reply [flat|nested] 3+ messages in thread
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2019-05-30 11:12 [PATCH nft,v3 2/7] mnl: mnl_set_rcvbuffer() skips buffer size update if it is too small Pablo Neira Ayuso
2019-05-31 9:30 ` Phil Sutter
2019-05-31 9:59 ` Pablo Neira Ayuso
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