From 5aea2f88ab5f63f01885109a4afb1271607fc06b Mon Sep 17 00:00:00 2001 From: Stefano Brivio Date: Wed, 8 Mar 2023 12:38:39 +0100 Subject: tcp, udp: Fix partial success return codes in {tcp,udp}_sock_init() The comments say we should return 0 on partial success, and an error code on complete failure. Rationale: if the user configures a port forwarding, and we succeed to bind that port for IPv4 or IPv6 only, that might actually be what the user intended. Adjust the two functions to reflect the comments. Signed-off-by: Stefano Brivio Reviewed-by: David Gibson --- udp.c | 30 ++++++++++++++---------------- 1 file changed, 14 insertions(+), 16 deletions(-) (limited to 'udp.c') diff --git a/udp.c b/udp.c index 0ac0a3a..b7bc4f3 100644 --- a/udp.c +++ b/udp.c @@ -983,7 +983,7 @@ int udp_sock_init(const struct ctx *c, int ns, sa_family_t af, const void *addr, const char *ifname, in_port_t port) { union udp_epoll_ref uref = { .u32 = 0 }; - int s, ret = 0; + int s, r4 = SOCKET_MAX + 1, r6 = SOCKET_MAX + 1; if (ns) { uref.udp.port = (in_port_t)(port + @@ -999,8 +999,8 @@ int udp_sock_init(const struct ctx *c, int ns, sa_family_t af, uref.udp.orig = true; if (!ns) { - s = sock_l4(c, AF_INET, IPPROTO_UDP, addr, ifname, - port, uref.u32); + r4 = s = sock_l4(c, AF_INET, IPPROTO_UDP, addr, + ifname, port, uref.u32); udp_tap_map[V4][uref.udp.port].sock = s < 0 ? -1 : s; udp_splice_init[V4][port].sock = s < 0 ? -1 : s; @@ -1008,13 +1008,10 @@ int udp_sock_init(const struct ctx *c, int ns, sa_family_t af, struct in_addr loopback = { htonl(INADDR_LOOPBACK) }; uref.udp.ns = true; - s = sock_l4(c, AF_INET, IPPROTO_UDP, &loopback, - ifname, port, uref.u32); + r4 = s = sock_l4(c, AF_INET, IPPROTO_UDP, &loopback, + ifname, port, uref.u32); udp_splice_ns[V4][port].sock = s < 0 ? -1 : s; } - - if (s < 0) - ret = s; } if ((af == AF_INET6 || af == AF_UNSPEC) && c->ifi6) { @@ -1023,24 +1020,25 @@ int udp_sock_init(const struct ctx *c, int ns, sa_family_t af, uref.udp.orig = true; if (!ns) { - s = sock_l4(c, AF_INET6, IPPROTO_UDP, addr, ifname, - port, uref.u32); + r6 = s = sock_l4(c, AF_INET6, IPPROTO_UDP, addr, + ifname, port, uref.u32); udp_tap_map[V6][uref.udp.port].sock = s < 0 ? -1 : s; udp_splice_init[V6][port].sock = s < 0 ? -1 : s; } else { uref.udp.ns = true; - s = sock_l4(c, AF_INET6, IPPROTO_UDP, &in6addr_loopback, - ifname, port, uref.u32); + r6 = s = sock_l4(c, AF_INET6, IPPROTO_UDP, + &in6addr_loopback, + ifname, port, uref.u32); udp_splice_ns[V6][port].sock = s < 0 ? -1 : s; } - - if (s < 0) - ret = s; } - return ret; + if (IN_INTERVAL(0, SOCKET_MAX, r4) || IN_INTERVAL(0, SOCKET_MAX, r6)) + return 0; + + return r4 < 0 ? r4 : r6; } /** -- cgit v1.2.3