From dc467d526fa2f2f4589b175c42f77b5977ad5975 Mon Sep 17 00:00:00 2001 From: David Gibson Date: Tue, 14 Feb 2023 10:48:22 +1100 Subject: tcp: Split pool lookup from creating new sockets in tcp_conn_new_sock() tcp_conn_new_sock() first looks for a socket in a pre-opened pool, then if that's empty creates a new socket in the init namespace. Both parts of this are duplicated in other places: the pool lookup logic is duplicated in tcp_splice_new(), and the socket opening logic is duplicated in tcp_sock_refill_pool(). Split the function into separate parts so we can remove both these duplications. Signed-off-by: David Gibson Signed-off-by: Stefano Brivio --- tcp.c | 53 ++++++++++++++++++++++++++++------------------------- 1 file changed, 28 insertions(+), 25 deletions(-) (limited to 'tcp.c') diff --git a/tcp.c b/tcp.c index 2f40d62..a0e2e34 100644 --- a/tcp.c +++ b/tcp.c @@ -1858,24 +1858,35 @@ static void tcp_seq_init(const struct ctx *c, struct tcp_tap_conn *conn, } /** - * tcp_conn_new_sock() - Get socket for new connection from pool or make new one - * @c: Execution context - * @af: Address family + * tcp_conn_pool_sock() - Get socket for new connection from pre-opened pool + * @pool: Pool of pre-opened sockets * - * Return: socket number if available, negative code if socket creation failed + * Return: socket number if available, negative code if pool is empty */ -static int tcp_conn_new_sock(const struct ctx *c, sa_family_t af) +int tcp_conn_pool_sock(int pool[]) { - int *p = af == AF_INET6 ? init_sock_pool6 : init_sock_pool4, i, s = -1; + int s = -1, i; - for (i = 0; i < TCP_SOCK_POOL_SIZE; i++, p++) { - SWAP(s, *p); + for (i = 0; i < TCP_SOCK_POOL_SIZE; i++) { + SWAP(s, pool[i]); if (s >= 0) - break; + return s; } + return -1; +} - if (s < 0) - s = socket(af, SOCK_STREAM | SOCK_NONBLOCK, IPPROTO_TCP); +/** + * tcp_conn_new_sock() - Open and prepare new socket for connection + * @c: Execution context + * @af: Address family + * + * Return: socket number on success, negative code if socket creation failed + */ +static int tcp_conn_new_sock(const struct ctx *c, sa_family_t af) +{ + int s; + + s = socket(af, SOCK_STREAM | SOCK_NONBLOCK, IPPROTO_TCP); if (s > SOCKET_MAX) { close(s); @@ -1936,6 +1947,7 @@ static void tcp_conn_from_tap(struct ctx *c, int af, const void *addr, 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, @@ -1954,8 +1966,9 @@ static void tcp_conn_from_tap(struct ctx *c, int af, const void *addr, if (c->tcp.conn_count >= TCP_MAX_CONNS) return; - if ((s = tcp_conn_new_sock(c, af)) < 0) - return; + if ((s = tcp_conn_pool_sock(pool)) < 0) + if ((s = tcp_conn_new_sock(c, af)) < 0) + return; if (!c->no_map_gw) { if (af == AF_INET && IN4_ARE_ADDR_EQUAL(addr, &c->ip4.gw)) @@ -3016,20 +3029,10 @@ void tcp_sock_refill_pool(const struct ctx *c, int pool[], int af) int i; for (i = 0; i < TCP_SOCK_POOL_SIZE; i++) { - int *s = &pool[i]; - - if (*s >= 0) + if (pool[i] >= 0) break; - *s = socket(af, SOCK_STREAM | SOCK_NONBLOCK, IPPROTO_TCP); - if (*s > SOCKET_MAX) { - close(*s); - *s = -1; - return; - } - - if (*s >= 0) - tcp_sock_set_bufsize(c, *s); + pool[i] = tcp_conn_new_sock(c, af); } } -- cgit v1.2.3