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kernel-netlink: Increase the default receive buffer size

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Also simplify how we try to exceed the system-wide maximum.  We basically
just try to force the value and simply fall back to the regular call.
The kernel actually won't let the latter fail if the value is too big,
it just caps it at the internal maximum.
This commit is contained in:
Tobias Brunner
2023-07-26 15:14:50 +02:00
parent 0b47357091
commit 714c939018
2 changed files with 20 additions and 25 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/libcharon/plugins/kernel_netlink/kernel_netlink_shared.c
+13 -12
View File
@@ -57,6 +57,13 @@
#define SOL_NETLINK 270
#endif
/**
* Default receive buffer size
*/
#ifndef NETLINK_RCVBUF_DEFAULT
#define NETLINK_RCVBUF_DEFAULT (8 * 1024 * 1024)
#endif
typedef struct private_netlink_socket_t private_netlink_socket_t;
typedef struct private_netlink_event_socket_t private_netlink_event_socket_t;
@@ -656,7 +663,6 @@ netlink_socket_t *netlink_socket_create(int protocol, enum_name_t *names,
struct sockaddr_nl addr = {
.nl_family = AF_NETLINK,
};
bool force_buf = FALSE;
int on = 1, rcvbuf_size = 0;
INIT(this,
@@ -707,21 +713,16 @@ netlink_socket_t *netlink_socket_create(int protocol, enum_name_t *names,
rcvbuf_size = lib->settings->get_int(lib->settings,
"%s.plugins.kernel-netlink.receive_buffer_size",
rcvbuf_size, lib->ns);
NETLINK_RCVBUF_DEFAULT, lib->ns);
if (rcvbuf_size)
{
int optname;
force_buf = lib->settings->get_bool(lib->settings,
"%s.plugins.kernel-netlink.force_receive_buffer_size",
force_buf, lib->ns);
optname = force_buf ? SO_RCVBUFFORCE : SO_RCVBUF;
if (setsockopt(this->socket, SOL_SOCKET, optname, &rcvbuf_size,
if (setsockopt(this->socket, SOL_SOCKET, SO_RCVBUFFORCE, &rcvbuf_size,
sizeof(rcvbuf_size)) == -1 &&
setsockopt(this->socket, SOL_SOCKET, SO_RCVBUF, &rcvbuf_size,
sizeof(rcvbuf_size)) == -1)
{
DBG1(DBG_KNL, "failed to %supdate receive buffer size to %d: %s",
force_buf ? "forcibly " : "", rcvbuf_size, strerror(errno));
DBG1(DBG_KNL, "failed to set receive buffer size to %d: %s",
rcvbuf_size, strerror(errno));
}
}
if (this->parallel)