diff options
Diffstat (limited to 'util.c')
| -rw-r--r-- | util.c | 19 |
1 files changed, 17 insertions, 2 deletions
@@ -233,12 +233,13 @@ int sock_unix(char *sock_path) } /** - * sock_probe_mem() - Check if setting high SO_SNDBUF and SO_RCVBUF is allowed + * sock_probe_features() - Probe for socket features we might use * @c: Execution context */ -void sock_probe_mem(struct ctx *c) +void sock_probe_features(struct ctx *c) { int v = INT_MAX / 2, s; + const char lo[] = "lo"; socklen_t sl; s = socket(AF_INET, SOCK_STREAM | SOCK_CLOEXEC, IPPROTO_TCP); @@ -247,6 +248,7 @@ void sock_probe_mem(struct ctx *c) return; } + /* Check if setting high SO_SNDBUF and SO_RCVBUF is allowed */ sl = sizeof(v); if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, &v, sizeof(v)) || getsockopt(s, SOL_SOCKET, SO_SNDBUF, &v, &sl) || @@ -259,6 +261,19 @@ void sock_probe_mem(struct ctx *c) (size_t)v < RCVBUF_BIG) c->low_rmem = 1; + /* Check if SO_BINDTODEVICE is available + * + * Supported since kernel version 5.7, commit c427bfec18f2 ("net: core: + * enable SO_BINDTODEVICE for non-root users"). Some distro kernels may + * have backports, of course. Record whether we can use it so that we + * can give more useful diagnostics. + */ + if (setsockopt(s, SOL_SOCKET, SO_BINDTODEVICE, lo, sizeof(lo) - 1)) { + if (errno != EPERM) + warn_perror("Unexpected error probing SO_BINDTODEVICE"); + c->no_bindtodevice = 1; + } + close(s); } |