diff options
| -rw-r--r-- | tcp.c | 34 | ||||
| -rw-r--r-- | tcp_conn.h | 2 | ||||
| -rw-r--r-- | tcp_splice.c | 55 |
3 files changed, 62 insertions, 29 deletions
@@ -1792,7 +1792,7 @@ int tcp_conn_pool_sock(int pool[]) * * Return: socket number on success, negative code if socket creation failed */ -int tcp_conn_new_sock(const struct ctx *c, sa_family_t af) +static int tcp_conn_new_sock(const struct ctx *c, sa_family_t af) { int s; @@ -1812,6 +1812,32 @@ int tcp_conn_new_sock(const struct ctx *c, sa_family_t af) } /** + * tcp_conn_sock() - Obtain a connectable socket in the host/init namespace + * @c: Execution context + * @af: Address family (AF_INET or AF_INET6) + * + * Return: Socket fd on success, -errno on failure + */ +int tcp_conn_sock(const struct ctx *c, sa_family_t af) +{ + int *pool = af == AF_INET6 ? init_sock_pool6 : init_sock_pool4; + int s; + + if ((s = tcp_conn_pool_sock(pool)) >= 0) + return s; + + /* If the pool is empty we just open a new one without refilling the + * pool to keep latency down. + */ + if ((s = tcp_conn_new_sock(c, af)) >= 0) + return s; + + err("TCP: Unable to open socket for new connection: %s", + strerror(-s)); + return -1; +} + +/** * tcp_conn_tap_mss() - Get MSS value advertised by tap/guest * @conn: Connection pointer * @opts: Pointer to start of TCP options @@ -1909,7 +1935,6 @@ static void tcp_conn_from_tap(struct ctx *c, sa_family_t af, const struct tcphdr *th, const char *opts, size_t optlen, const struct timespec *now) { - int *pool = af == AF_INET6 ? init_sock_pool6 : init_sock_pool4; struct sockaddr_in addr4 = { .sin_family = AF_INET, .sin_port = th->dest, @@ -1931,9 +1956,8 @@ static void tcp_conn_from_tap(struct ctx *c, sa_family_t af, if (!(flow = flow_alloc())) return; - if ((s = tcp_conn_pool_sock(pool)) < 0) - if ((s = tcp_conn_new_sock(c, af)) < 0) - goto cancel; + if ((s = tcp_conn_sock(c, af)) < 0) + goto cancel; if (!c->no_map_gw) { if (af == AF_INET && IN4_ARE_ADDR_EQUAL(daddr, &c->ip4.gw)) @@ -159,7 +159,7 @@ bool tcp_flow_defer(union flow *flow); bool tcp_splice_flow_defer(union flow *flow); void tcp_splice_timer(const struct ctx *c, union flow *flow); int tcp_conn_pool_sock(int pool[]); -int tcp_conn_new_sock(const struct ctx *c, sa_family_t af); +int tcp_conn_sock(const struct ctx *c, sa_family_t af); int tcp_sock_refill_pool(const struct ctx *c, int pool[], sa_family_t af); void tcp_splice_refill(const struct ctx *c); diff --git a/tcp_splice.c b/tcp_splice.c index ee68029..5b38a82 100644 --- a/tcp_splice.c +++ b/tcp_splice.c @@ -377,6 +377,34 @@ static int tcp_splice_connect(const struct ctx *c, struct tcp_splice_conn *conn, } /** + * tcp_conn_sock_ns() - Obtain a connectable socket in the namespace + * @c: Execution context + * @af: Address family (AF_INET or AF_INET6) + * + * Return: Socket fd in the namespace on success, -errno on failure + */ +static int tcp_conn_sock_ns(const struct ctx *c, sa_family_t af) +{ + int *p = af == AF_INET6 ? ns_sock_pool6 : ns_sock_pool4; + int s; + + if ((s = tcp_conn_pool_sock(p)) >= 0) + return s; + + /* If the pool is empty we have to incur the latency of entering the ns. + * Therefore, we might as well refill the whole pool while we're at it. + * This differs from tcp_conn_sock(). + */ + NS_CALL(tcp_sock_refill_ns, c); + + if ((s = tcp_conn_pool_sock(p)) >= 0) + return s; + + err("TCP: No available ns sockets for new connection"); + return -1; +} + +/** * tcp_splice_new() - Handle new spliced connection * @c: Execution context * @conn: Connection pointer @@ -388,38 +416,19 @@ static int tcp_splice_connect(const struct ctx *c, struct tcp_splice_conn *conn, static int tcp_splice_new(const struct ctx *c, struct tcp_splice_conn *conn, in_port_t port, uint8_t pif) { + sa_family_t af = CONN_V6(conn) ? AF_INET6 : AF_INET; int s = -1; - /* If the pool is empty we take slightly different approaches - * for init or ns sockets. For init sockets we just open a - * new one without refilling the pool to keep latency down. - * For ns sockets, we're going to incur the latency of - * entering the ns anyway, so we might as well refill the - * pool. - */ if (pif == PIF_SPLICE) { - int *p = CONN_V6(conn) ? init_sock_pool6 : init_sock_pool4; - sa_family_t af = CONN_V6(conn) ? AF_INET6 : AF_INET; - - s = tcp_conn_pool_sock(p); - if (s < 0) - s = tcp_conn_new_sock(c, af); + s = tcp_conn_sock(c, af); } else { - int *p = CONN_V6(conn) ? ns_sock_pool6 : ns_sock_pool4; - ASSERT(pif == PIF_HOST); - /* If pool is empty, refill it first */ - if (p[TCP_SOCK_POOL_SIZE-1] < 0) - NS_CALL(tcp_sock_refill_ns, c); - - s = tcp_conn_pool_sock(p); + s = tcp_conn_sock_ns(c, af); } - if (s < 0) { - warn("Couldn't open connectable socket for splice (%d)", s); + if (s < 0) return s; - } return tcp_splice_connect(c, conn, s, port); } |