/** * @file udp.c * @note Copyright (C) 2011 Richard Cochran * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include #include #include #include #include #include #include #include #include #include #include #include #include "contain.h" #include "print.h" #include "sk.h" #include "ether.h" #include "transport_private.h" #include "udp.h" #define EVENT_PORT 319 #define GENERAL_PORT 320 #define PTP_PRIMARY_MCAST_IPADDR "224.0.1.129" #define PTP_PDELAY_MCAST_IPADDR "224.0.0.107" struct udp { struct transport t; uint8_t ip[4]; int ip_len; uint8_t mac[MAC_LEN]; int mac_len; }; static int mcast_bind(int fd, int index) { int err; struct ip_mreqn req; memset(&req, 0, sizeof(req)); req.imr_ifindex = index; err = setsockopt(fd, IPPROTO_IP, IP_MULTICAST_IF, &req, sizeof(req)); if (err) { pr_err("setsockopt IP_MULTICAST_IF failed: %m"); return -1; } return 0; } static int mcast_join(int fd, int index, const struct sockaddr *grp, socklen_t grplen) { int err, off = 0; struct ip_mreqn req; struct sockaddr_in *sa = (struct sockaddr_in *) grp; memset(&req, 0, sizeof(req)); memcpy(&req.imr_multiaddr, &sa->sin_addr, sizeof(struct in_addr)); req.imr_ifindex = index; err = setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &req, sizeof(req)); if (err) { pr_err("setsockopt IP_ADD_MEMBERSHIP failed: %m"); return -1; } err = setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP, &off, sizeof(off)); if (err) { pr_err("setsockopt IP_MULTICAST_LOOP failed: %m"); return -1; } return 0; } static int udp_close(struct transport *t, struct fdarray *fda) { close(fda->fd[0]); close(fda->fd[1]); return 0; } static int open_socket(char *name, struct in_addr mc_addr[2], short port) { struct sockaddr_in addr; int fd, index, on = 1; memset(&addr, 0, sizeof(addr)); addr.sin_family = AF_INET; addr.sin_addr.s_addr = htonl(INADDR_ANY); addr.sin_port = htons(port); fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP); if (fd < 0) { pr_err("socket failed: %m"); goto no_socket; } index = sk_interface_index(fd, name); if (index < 0) goto no_option; if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on))) { pr_err("setsockopt SO_REUSEADDR failed: %m"); goto no_option; } if (bind(fd, (struct sockaddr *) &addr, sizeof(addr))) { pr_err("bind failed: %m"); goto no_option; } if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, name, strlen(name))) { pr_err("setsockopt SO_BINDTODEVICE failed: %m"); goto no_option; } addr.sin_addr = mc_addr[0]; if (mcast_join(fd, index, (struct sockaddr *) &addr, sizeof(addr))) { pr_err("mcast_join failed"); goto no_option; } addr.sin_addr = mc_addr[1]; if (mcast_join(fd, index, (struct sockaddr *) &addr, sizeof(addr))) { pr_err("mcast_join failed"); goto no_option; } if (mcast_bind(fd, index)) { goto no_option; } return fd; no_option: close(fd); no_socket: return -1; } enum { MC_PRIMARY, MC_PDELAY }; static struct in_addr mcast_addr[2]; static int udp_open(struct transport *t, char *name, struct fdarray *fda, enum timestamp_type ts_type) { struct udp *udp = container_of(t, struct udp, t); int efd, gfd; udp->mac_len = 0; if (sk_interface_macaddr(name, udp->mac, MAC_LEN) == 0) udp->mac_len = MAC_LEN; udp->ip_len = sk_interface_addr(name, AF_INET, udp->ip, sizeof(udp->ip)); if (udp->ip_len == -1) udp->ip_len = 0; if (!inet_aton(PTP_PRIMARY_MCAST_IPADDR, &mcast_addr[MC_PRIMARY])) return -1; if (!inet_aton(PTP_PDELAY_MCAST_IPADDR, &mcast_addr[MC_PDELAY])) return -1; efd = open_socket(name, mcast_addr, EVENT_PORT); if (efd < 0) goto no_event; gfd = open_socket(name, mcast_addr, GENERAL_PORT); if (gfd < 0) goto no_general; if (sk_timestamping_init(efd, name, ts_type, TRANS_UDP_IPV4)) goto no_timestamping; fda->fd[FD_EVENT] = efd; fda->fd[FD_GENERAL] = gfd; return 0; no_timestamping: close(gfd); no_general: close(efd); no_event: return -1; } static int udp_recv(struct transport *t, int fd, void *buf, int buflen, struct hw_timestamp *hwts) { return sk_receive(fd, buf, buflen, hwts, 0); } static int udp_send(struct transport *t, struct fdarray *fda, int event, int peer, void *buf, int len, struct hw_timestamp *hwts) { ssize_t cnt; int fd = event ? fda->fd[FD_EVENT] : fda->fd[FD_GENERAL]; struct sockaddr_in addr; unsigned char junk[1600]; memset(&addr, 0, sizeof(addr)); addr.sin_family = AF_INET; addr.sin_addr = peer ? mcast_addr[MC_PDELAY] : mcast_addr[MC_PRIMARY]; addr.sin_port = htons(event ? EVENT_PORT : GENERAL_PORT); /* * Extend the payload by two, for UDP checksum correction. * This is not really part of the standard, but it is the way * that the phyter works. */ if (event == TRANS_ONESTEP) len += 2; cnt = sendto(fd, buf, len, 0, (struct sockaddr *)&addr, sizeof(addr)); if (cnt < 1) { pr_err("sendto failed: %m"); return cnt; } /* * Get the time stamp right away. */ return event == TRANS_EVENT ? sk_receive(fd, junk, len, hwts, MSG_ERRQUEUE) : cnt; } static void udp_release(struct transport *t) { struct udp *udp = container_of(t, struct udp, t); free(udp); } int udp_physical_addr(struct transport *t, uint8_t *addr) { struct udp *udp = container_of(t, struct udp, t); if (udp->mac_len) memcpy(addr, udp->mac, udp->mac_len); return udp->mac_len; } int udp_protocol_addr(struct transport *t, uint8_t *addr) { struct udp *udp = container_of(t, struct udp, t); if (udp->ip_len) memcpy(addr, &udp->ip, udp->ip_len); return udp->ip_len; } struct transport *udp_transport_create(void) { struct udp *udp = calloc(1, sizeof(*udp)); if (!udp) return NULL; udp->t.close = udp_close; udp->t.open = udp_open; udp->t.recv = udp_recv; udp->t.send = udp_send; udp->t.release = udp_release; udp->t.physical_addr = udp_physical_addr; udp->t.protocol_addr = udp_protocol_addr; return &udp->t; }