diff options
| -rw-r--r-- | udp.c | 52 | ||||
| -rw-r--r-- | udp.h | 2 |
2 files changed, 34 insertions, 20 deletions
@@ -513,16 +513,25 @@ static int udp_splice_new_ns(void *arg) } /** - * sa_port() - Determine port from a sockaddr_in or sockaddr_in6 + * udp_mmh_splice_port() - Is source address of message suitable for splicing? * @v6: Is @sa a sockaddr_in6 (otherwise sockaddr_in)? - * @sa: Pointer to either sockaddr_in or sockaddr_in6 + * @mmh: mmsghdr of incoming message + * + * Return: if @sa refers to localhost (127.0.0.1 or ::1) the port from + * @sa in host order, otherwise -1. */ -static in_port_t sa_port(bool v6, const void *sa) +static int udp_mmh_splice_port(bool v6, const struct mmsghdr *mmh) { - const struct sockaddr_in6 *sa6 = sa; - const struct sockaddr_in *sa4 = sa; + const struct sockaddr_in6 *sa6 = mmh->msg_hdr.msg_name; + const struct sockaddr_in *sa4 = mmh->msg_hdr.msg_name; + + if (v6 && IN6_IS_ADDR_LOOPBACK(&sa6->sin6_addr)) + return ntohs(sa6->sin6_port); + + if (!v6 && IN4_IS_ADDR_LOOPBACK(&sa4->sin_addr)) + return ntohs(sa4->sin_port); - return v6 ? ntohs(sa6->sin6_port) : ntohs(sa4->sin_port); + return -1; } /** @@ -926,23 +935,28 @@ void udp_sock_handler(const struct ctx *c, union epoll_ref ref, uint32_t events, if (n <= 0) return; - if (!ref.r.p.udp.udp.splice) { - udp_tap_send(c, 0, n, dstport, v6, now); - return; - } - for (i = 0; i < n; i += m) { - in_port_t src = sa_port(v6, mmh_recv[i].msg_hdr.msg_name); + int splicefrom = -1; + m = n; + + if (ref.r.p.udp.udp.splice) { + splicefrom = udp_mmh_splice_port(v6, mmh_recv + i); + + for (m = 1; i + m < n; m++) { + int p; - for (m = 1; i + m < n; m++) { - void *mname = mmh_recv[i + m].msg_hdr.msg_name; - if (sa_port(v6, mname) != src) - break; + p = udp_mmh_splice_port(v6, mmh_recv + i + m); + if (p != splicefrom) + break; + } } - udp_splice_sendfrom(c, i, m, src, dstport, v6, - ref.r.p.udp.udp.ns, ref.r.p.udp.udp.orig, - now); + if (splicefrom >= 0) + udp_splice_sendfrom(c, i, m, splicefrom, dstport, + v6, ref.r.p.udp.udp.ns, + ref.r.p.udp.udp.orig, now); + else + udp_tap_send(c, i, m, dstport, v6, now); } } @@ -22,7 +22,7 @@ void udp_update_l2_buf(const unsigned char *eth_d, const unsigned char *eth_s, /** * union udp_epoll_ref - epoll reference portion for TCP connections * @bound: Set if this file descriptor is a bound socket - * @splice: Set if descriptor is associated to "spliced" connection + * @splice: Set if descriptor packets to be "spliced" * @orig: Set if a spliced socket which can originate "connections" * @ns: Set if this is a socket in the pasta network namespace * @v6: Set for IPv6 sockets or connections |