/* * Copyright (C) 2003 Yasuhiro Ohara * * This file is part of GNU Zebra. * * GNU Zebra 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, or (at your option) any * later version. * * GNU Zebra 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 GNU Zebra; see the file COPYING. If not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ #include #include "log.h" #include "memory.h" #include "sockunion.h" #include "sockopt.h" #include "privs.h" #include "libospf.h" #include "ospf6_proto.h" #include "ospf6_network.h" extern struct zebra_privs_t ospf6d_privs; int ospf6_sock; struct in6_addr allspfrouters6; struct in6_addr alldrouters6; /* setsockopt ReUseAddr to on */ void ospf6_set_reuseaddr (void) { u_int on = 0; if (setsockopt (ospf6_sock, SOL_SOCKET, SO_REUSEADDR, &on, sizeof (u_int)) < 0) zlog_warn ("Network: set SO_REUSEADDR failed: %s", safe_strerror (errno)); } /* setsockopt MulticastLoop to off */ void ospf6_reset_mcastloop (void) { u_int off = 0; if (setsockopt (ospf6_sock, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &off, sizeof (u_int)) < 0) zlog_warn ("Network: reset IPV6_MULTICAST_LOOP failed: %s", safe_strerror (errno)); } void ospf6_set_pktinfo (void) { setsockopt_ipv6_pktinfo (ospf6_sock, 1); } void ospf6_set_transport_class (void) { #ifdef IPTOS_PREC_INTERNETCONTROL setsockopt_ipv6_tclass (ospf6_sock, IPTOS_PREC_INTERNETCONTROL); #endif } void ospf6_set_checksum (void) { int offset = 12; #ifndef DISABLE_IPV6_CHECKSUM if (setsockopt (ospf6_sock, IPPROTO_IPV6, IPV6_CHECKSUM, &offset, sizeof (offset)) < 0) zlog_warn ("Network: set IPV6_CHECKSUM failed: %s", safe_strerror (errno)); #else zlog_warn ("Network: Don't set IPV6_CHECKSUM"); #endif /* DISABLE_IPV6_CHECKSUM */ } /* Make ospf6d's server socket. */ int ospf6_serv_sock (void) { if (ospf6d_privs.change (ZPRIVS_RAISE)) zlog_err ("ospf6_serv_sock: could not raise privs"); ospf6_sock = socket (AF_INET6, SOCK_RAW, IPPROTO_OSPFIGP); if (ospf6_sock < 0) { zlog_warn ("Network: can't create OSPF6 socket."); if (ospf6d_privs.change (ZPRIVS_LOWER)) zlog_err ("ospf_sock_init: could not lower privs"); return -1; } if (ospf6d_privs.change (ZPRIVS_LOWER)) zlog_err ("ospf_sock_init: could not lower privs"); /* set socket options */ #if 1 sockopt_reuseaddr (ospf6_sock); #else ospf6_set_reuseaddr (); #endif /*1*/ ospf6_reset_mcastloop (); ospf6_set_pktinfo (); ospf6_set_transport_class (); ospf6_set_checksum (); /* setup global in6_addr, allspf6 and alldr6 for later use */ inet_pton (AF_INET6, ALLSPFROUTERS6, &allspfrouters6); inet_pton (AF_INET6, ALLDROUTERS6, &alldrouters6); return 0; } /* ospf6 set socket option */ void ospf6_sso (u_int ifindex, struct in6_addr *group, int option) { struct ipv6_mreq mreq6; int ret; assert (ifindex); mreq6.ipv6mr_interface = ifindex; memcpy (&mreq6.ipv6mr_multiaddr, group, sizeof (struct in6_addr)); ret = setsockopt (ospf6_sock, IPPROTO_IPV6, option, &mreq6, sizeof (mreq6)); if (ret < 0) zlog_err ("Network: setsockopt (%d) on ifindex %d failed: %s", option, ifindex, safe_strerror (errno)); } static int iov_count (struct iovec *iov) { int i; for (i = 0; iov[i].iov_base; i++) ; return i; } static int iov_totallen (struct iovec *iov) { int i; int totallen = 0; for (i = 0; iov[i].iov_base; i++) totallen += iov[i].iov_len; return totallen; } int ospf6_sendmsg (struct in6_addr *src, struct in6_addr *dst, unsigned int *ifindex, struct iovec *message) { int retval; struct msghdr smsghdr; struct cmsghdr *scmsgp; u_char cmsgbuf[CMSG_SPACE(sizeof (struct in6_pktinfo))]; struct in6_pktinfo *pktinfo; struct sockaddr_in6 dst_sin6; assert (dst); assert (*ifindex); scmsgp = (struct cmsghdr *)cmsgbuf; pktinfo = (struct in6_pktinfo *)(CMSG_DATA(scmsgp)); memset (&dst_sin6, 0, sizeof (struct sockaddr_in6)); /* source address */ pktinfo->ipi6_ifindex = *ifindex; if (src) memcpy (&pktinfo->ipi6_addr, src, sizeof (struct in6_addr)); else memset (&pktinfo->ipi6_addr, 0, sizeof (struct in6_addr)); /* destination address */ dst_sin6.sin6_family = AF_INET6; #ifdef SIN6_LEN dst_sin6.sin6_len = sizeof (struct sockaddr_in6); #endif /*SIN6_LEN*/ memcpy (&dst_sin6.sin6_addr, dst, sizeof (struct in6_addr)); #ifdef HAVE_SIN6_SCOPE_ID dst_sin6.sin6_scope_id = *ifindex; #endif /* send control msg */ scmsgp->cmsg_level = IPPROTO_IPV6; scmsgp->cmsg_type = IPV6_PKTINFO; scmsgp->cmsg_len = CMSG_LEN (sizeof (struct in6_pktinfo)); /* scmsgp = CMSG_NXTHDR (&smsghdr, scmsgp); */ /* send msg hdr */ memset (&smsghdr, 0, sizeof (smsghdr)); smsghdr.msg_iov = message; smsghdr.msg_iovlen = iov_count (message); smsghdr.msg_name = (caddr_t) &dst_sin6; smsghdr.msg_namelen = sizeof (struct sockaddr_in6); smsghdr.msg_control = (caddr_t) cmsgbuf; smsghdr.msg_controllen = scmsgp->cmsg_len; retval = sendmsg (ospf6_sock, &smsghdr, 0); if (retval != iov_totallen (message)) zlog_warn ("sendmsg failed: ifindex: %d: %s (%d)", *ifindex, safe_strerror (errno), errno); return retval; } int ospf6_recvmsg (struct in6_addr *src, struct in6_addr *dst, unsigned int *ifindex, struct iovec *message) { int retval; struct msghdr rmsghdr; struct cmsghdr *rcmsgp; u_char cmsgbuf[CMSG_SPACE(sizeof (struct in6_pktinfo))]; struct in6_pktinfo *pktinfo; struct sockaddr_in6 src_sin6; rcmsgp = (struct cmsghdr *)cmsgbuf; pktinfo = (struct in6_pktinfo *)(CMSG_DATA(rcmsgp)); memset (&src_sin6, 0, sizeof (struct sockaddr_in6)); /* receive control msg */ rcmsgp->cmsg_level = IPPROTO_IPV6; rcmsgp->cmsg_type = IPV6_PKTINFO; rcmsgp->cmsg_len = CMSG_LEN (sizeof (struct in6_pktinfo)); /* rcmsgp = CMSG_NXTHDR (&rmsghdr, rcmsgp); */ /* receive msg hdr */ memset (&rmsghdr, 0, sizeof (rmsghdr)); rmsghdr.msg_iov = message; rmsghdr.msg_iovlen = iov_count (message); rmsghdr.msg_name = (caddr_t) &src_sin6; rmsghdr.msg_namelen = sizeof (struct sockaddr_in6); rmsghdr.msg_control = (caddr_t) cmsgbuf; rmsghdr.msg_controllen = sizeof (cmsgbuf); retval = recvmsg (ospf6_sock, &rmsghdr, 0); if (retval < 0) zlog_warn ("recvmsg failed: %s", safe_strerror (errno)); else if (retval == iov_totallen (message)) zlog_warn ("recvmsg read full buffer size: %d", retval); /* source address */ assert (src); memcpy (src, &src_sin6.sin6_addr, sizeof (struct in6_addr)); /* destination address */ if (ifindex) *ifindex = pktinfo->ipi6_ifindex; if (dst) memcpy (dst, &pktinfo->ipi6_addr, sizeof (struct in6_addr)); return retval; }