From: Guus Sliepen Date: Thu, 10 Dec 2015 15:30:32 +0000 (+0100) Subject: Add support for recvmmsg(). X-Git-Tag: release-1.1pre12~78 X-Git-Url: https://git.tinc-vpn.org/git/browse?a=commitdiff_plain;h=e4fd81ed2d66b8fe3c2857244fe3da85c803cf60;p=tinc Add support for recvmmsg(). Based on a patch from Samuel Thibault and input from Michael Tokarev. --- diff --git a/THANKS b/THANKS index d3af70b0..77a04e45 100644 --- a/THANKS +++ b/THANKS @@ -67,6 +67,7 @@ We would like to thank the following people for their contributions to tinc: * Robert van der Meulen * Rumko * Sam Bryan +* Samuel Thibault * Saverio Proto * Scott Lamb * Steffan Karger diff --git a/configure.ac b/configure.ac index 005a24a4..89957ac2 100644 --- a/configure.ac +++ b/configure.ac @@ -198,7 +198,7 @@ AC_CHECK_TYPES([socklen_t, struct ether_header, struct arphdr, struct ether_arp, dnl Checks for library functions. AC_TYPE_SIGNAL -AC_CHECK_FUNCS([asprintf daemon fchmod flock ftime fork get_current_dir_name gettimeofday mlockall putenv random select strdup strerror strsignal strtol system time usleep unsetenv vsyslog writev], +AC_CHECK_FUNCS([asprintf daemon fchmod flock ftime fork get_current_dir_name gettimeofday mlockall putenv random recvmmsg select strdup strerror strsignal strtol system time usleep unsetenv vsyslog writev], [], [], [#include "$srcdir/src/have.h"] ) diff --git a/src/net_packet.c b/src/net_packet.c index 6f72e05b..e7161445 100644 --- a/src/net_packet.c +++ b/src/net_packet.c @@ -1393,42 +1393,27 @@ static node_t *try_harder(const sockaddr_t *from, const vpn_packet_t *pkt) { return match; } -void handle_incoming_vpn_data(void *data, int flags) { - listen_socket_t *ls = data; - vpn_packet_t pkt; +static void handle_incoming_vpn_packet(listen_socket_t *ls, vpn_packet_t *pkt, sockaddr_t *addr) { char *hostname; node_id_t nullid = {}; - sockaddr_t addr = {}; - socklen_t addrlen = sizeof addr; node_t *from, *to; bool direct = false; - pkt.offset = 0; - int len = recvfrom(ls->udp.fd, DATA(&pkt), MAXSIZE, 0, &addr.sa, &addrlen); - - if(len <= 0 || len > MAXSIZE) { - if(!sockwouldblock(sockerrno)) - logger(DEBUG_ALWAYS, LOG_ERR, "Receiving packet failed: %s", sockstrerror(sockerrno)); - return; - } - - pkt.len = len; - - sockaddrunmap(&addr); /* Some braindead IPv6 implementations do stupid things. */ + sockaddrunmap(addr); /* Some braindead IPv6 implementations do stupid things. */ // Try to figure out who sent this packet. - node_t *n = lookup_node_udp(&addr); + node_t *n = lookup_node_udp(addr); if(n && !n->status.udp_confirmed) n = NULL; // Don't believe it if we don't have confirmation yet. if(!n) { // It might be from a 1.1 node, which might have a source ID in the packet. - pkt.offset = 2 * sizeof(node_id_t); - from = lookup_node_id(SRCID(&pkt)); - if(from && !memcmp(DSTID(&pkt), &nullid, sizeof nullid) && from->status.sptps) { - if(sptps_verify_datagram(&from->sptps, DATA(&pkt), pkt.len - 2 * sizeof(node_id_t))) + pkt->offset = 2 * sizeof(node_id_t); + from = lookup_node_id(SRCID(pkt)); + if(from && !memcmp(DSTID(pkt), &nullid, sizeof nullid) && from->status.sptps) { + if(sptps_verify_datagram(&from->sptps, DATA(pkt), pkt->len - 2 * sizeof(node_id_t))) n = from; else goto skip_harder; @@ -1436,36 +1421,36 @@ void handle_incoming_vpn_data(void *data, int flags) { } if(!n) { - pkt.offset = 0; - n = try_harder(&addr, &pkt); + pkt->offset = 0; + n = try_harder(addr, pkt); } skip_harder: if(!n) { if(debug_level >= DEBUG_PROTOCOL) { - hostname = sockaddr2hostname(&addr); + hostname = sockaddr2hostname(addr); logger(DEBUG_PROTOCOL, LOG_WARNING, "Received UDP packet from unknown source %s", hostname); free(hostname); } return; } - pkt.offset = 0; + pkt->offset = 0; if(n->status.sptps) { bool relay_enabled = (n->options >> 24) >= 4; if (relay_enabled) { - pkt.offset = 2 * sizeof(node_id_t); - pkt.len -= pkt.offset; + pkt->offset = 2 * sizeof(node_id_t); + pkt->len -= pkt->offset; } - if(!memcmp(DSTID(&pkt), &nullid, sizeof nullid) || !relay_enabled) { + if(!memcmp(DSTID(pkt), &nullid, sizeof nullid) || !relay_enabled) { direct = true; from = n; to = myself; } else { - from = lookup_node_id(SRCID(&pkt)); - to = lookup_node_id(DSTID(&pkt)); + from = lookup_node_id(SRCID(pkt)); + to = lookup_node_id(DSTID(pkt)); } if(!from || !to) { logger(DEBUG_PROTOCOL, LOG_WARNING, "Received UDP packet from %s (%s) with unknown source and/or destination ID", n->name, n->hostname); @@ -1491,7 +1476,7 @@ skip_harder: /* If we're not the final recipient, relay the packet. */ if(to != myself) { - send_sptps_data(to, from, 0, DATA(&pkt), pkt.len); + send_sptps_data(to, from, 0, DATA(pkt), pkt->len); try_tx(to, true); return; } @@ -1500,12 +1485,12 @@ skip_harder: from = n; } - if(!receive_udppacket(from, &pkt)) + if(!receive_udppacket(from, pkt)) return; n->sock = ls - listen_socket; - if(direct && sockaddrcmp(&addr, &n->address)) - update_node_udp(n, &addr); + if(direct && sockaddrcmp(addr, &n->address)) + update_node_udp(n, addr); /* If the packet went through a relay, help the sender find the appropriate MTU through the relay path. */ @@ -1514,6 +1499,66 @@ skip_harder: send_mtu_info(myself, n, MTU); } +void handle_incoming_vpn_data(void *data, int flags) { + listen_socket_t *ls = data; + +#ifdef HAVE_RECVMMSG +#define MAX_MSG 64 + vpn_packet_t pkt[MAX_MSG]; + sockaddr_t addr[MAX_MSG]; + struct mmsghdr msg[MAX_MSG]; + struct iovec iov[MAX_MSG]; + + for(int i = 0; i < MAX_MSG; i++) { + pkt[i].offset = 0; + + iov[i] = (struct iovec){ + .iov_base = DATA(&pkt[i]), + .iov_len = MAXSIZE, + }; + + msg[i].msg_hdr = (struct msghdr){ + .msg_name = &addr[i].sa, + .msg_namelen = sizeof addr[i], + .msg_iov = &iov[i], + .msg_iovlen = 1, + }; + } + + int num = recvmmsg(ls->udp.fd, msg, MAX_MSG, MSG_DONTWAIT, NULL); + + if(num < 0) { + if(!sockwouldblock(sockerrno)) + logger(DEBUG_ALWAYS, LOG_ERR, "Receiving packet failed: %s", sockstrerror(sockerrno)); + return; + } + + for(int i = 0; i < num; i++) { + pkt[i].len = msg[i].msg_len; + if(pkt[i].len <= 0 || pkt[i].len > MAXSIZE) + continue; + handle_incoming_vpn_packet(ls, &pkt[i], &addr[i]); + } +#else + vpn_packet_t pkt; + sockaddr_t addr = {}; + socklen_t addrlen = sizeof addr; + + pkt.offset = 0; + int len = recvfrom(ls->udp.fd, DATA(&pkt), MAXSIZE, 0, &addr.sa, &addrlen); + + if(len <= 0 || len > MAXSIZE) { + if(!sockwouldblock(sockerrno)) + logger(DEBUG_ALWAYS, LOG_ERR, "Receiving packet failed: %s", sockstrerror(sockerrno)); + return; + } + + pkt.len = len; + + handle_incoming_vpn_packet(ls, &pkt, &addr); +#endif +} + void handle_device_data(void *data, int flags) { vpn_packet_t packet; packet.offset = DEFAULT_PACKET_OFFSET;