diff options
Diffstat (limited to 'tcp.c')
| -rw-r--r-- | tcp.c | 37 |
1 files changed, 25 insertions, 12 deletions
@@ -2471,6 +2471,29 @@ static void tcp_sock_refill_init(const struct ctx *c) } /** + * tcp_probe_peek_offset_cap() - Check if SO_PEEK_OFF is supported by kernel + * @af: Address family, IPv4 or IPv6 + * + * Return: true if supported, false otherwise + */ +bool tcp_probe_peek_offset_cap(sa_family_t af) +{ + bool ret = false; + int s, optv = 0; + + s = socket(af, SOCK_STREAM | SOCK_CLOEXEC, IPPROTO_TCP); + if (s < 0) { + warn_perror("Temporary TCP socket creation failed"); + } else { + if (!setsockopt(s, SOL_SOCKET, SO_PEEK_OFF, &optv, sizeof(int))) + ret = true; + close(s); + } + + return ret; +} + +/** * tcp_init() - Get initial sequence, hash secret, initialise per-socket data * @c: Execution context * @@ -2478,9 +2501,6 @@ static void tcp_sock_refill_init(const struct ctx *c) */ int tcp_init(struct ctx *c) { - unsigned int optv = 0; - int s; - ASSERT(!c->no_tcp); if (c->ifi4) @@ -2502,15 +2522,8 @@ int tcp_init(struct ctx *c) NS_CALL(tcp_ns_socks_init, c); } - /* Probe for SO_PEEK_OFF support */ - s = socket(AF_INET, SOCK_STREAM | SOCK_CLOEXEC, IPPROTO_TCP); - if (s < 0) { - warn_perror("Temporary TCP socket creation failed"); - } else { - if (!setsockopt(s, SOL_SOCKET, SO_PEEK_OFF, &optv, sizeof(int))) - peek_offset_cap = true; - close(s); - } + peek_offset_cap = (!c->ifi4 || tcp_probe_peek_offset_cap(AF_INET)) && + (!c->ifi6 || tcp_probe_peek_offset_cap(AF_INET6)); info("SO_PEEK_OFF%ssupported", peek_offset_cap ? " " : " not "); return 0; |