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libbb: set netlink socket revbuf size before binding

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As soon as the socket is bound it will receive messages. Make sure the
recieve buffer size is increased before the first message is received.

Signed-off-by: Jan Klötzke <jan@kloetzke.net>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Jan Klötzke authored and Denys Vlasenko committed 2020-11-22 13:12:51 +01:00
1 parent 9bf4499dd7
commit 12aa68d10f
1 file changed
+12 -8
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libbb/xconnect.c
+12 -8
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@@ -422,17 +422,14 @@ int FAST_FUNC create_and_bind_to_netlink(int proto, int grp, unsigned rcvbuf)
struct sockaddr_nl sa;
int fd;
memset(&sa, 0, sizeof(sa));
sa.nl_family = AF_NETLINK;
sa.nl_pid = getpid();
sa.nl_groups = grp;
fd = xsocket(AF_NETLINK, SOCK_DGRAM, proto);
xbind(fd, (struct sockaddr *) &sa, sizeof(sa));
close_on_exec_on(fd);
/* Set receive buffer size before binding the socket
* We want to have enough space before we start receiving messages.
*/
if (rcvbuf != 0) {
// SO_RCVBUFFORCE (root only) can go above net.core.rmem_max sysctl
setsockopt_SOL_SOCKET_int(fd, SO_RCVBUF, rcvbuf);
setsockopt_SOL_SOCKET_int(fd, SO_RCVBUF, rcvbuf);
/* SO_RCVBUFFORCE (root only) can go above net.core.rmem_max */
setsockopt_SOL_SOCKET_int(fd, SO_RCVBUFFORCE, rcvbuf);
# if 0
{
@@ -444,6 +441,13 @@ int FAST_FUNC create_and_bind_to_netlink(int proto, int grp, unsigned rcvbuf)
# endif
}
memset(&sa, 0, sizeof(sa));
sa.nl_family = AF_NETLINK;
sa.nl_pid = getpid();
sa.nl_groups = grp;
xbind(fd, (struct sockaddr *) &sa, sizeof(sa));
close_on_exec_on(fd);
return fd;
}
#endif