ospf6d/ospf6_network.c

   1 /*
   2  * Copyright (C) 2003 Yasuhiro Ohara
   3  *
   4  * This file is part of GNU Zebra.
   5  *
   6  * GNU Zebra is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; either version 2, or (at your option) any
   9  * later version.
  10  *
  11  * GNU Zebra is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; see the file COPYING; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #include <zebra.h>
  22
  23 #include "log.h"
  24 #include "memory.h"
  25 #include "sockunion.h"
  26 #include "sockopt.h"
  27 #include "privs.h"
  28
  29 #include "libospf.h"
  30 #include "ospf6_proto.h"
  31 #include "ospf6_network.h"
  32
  33 extern struct zebra_privs_t ospf6d_privs;
  34
  35 int ospf6_sock;
  36 struct in6_addr allspfrouters6;
  37 struct in6_addr alldrouters6;
  38
  39 /* setsockopt MulticastLoop to off */
  40 static void ospf6_reset_mcastloop(void)
  41 {
  42         u_int off = 0;
  43         if (setsockopt(ospf6_sock, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &off,
  44                        sizeof(u_int))
  45             < 0)
  46                 zlog_warn("Network: reset IPV6_MULTICAST_LOOP failed: %s",
  47                           safe_strerror(errno));
  48 }
  49
  50 static void ospf6_set_pktinfo(void)
  51 {
  52         setsockopt_ipv6_pktinfo(ospf6_sock, 1);
  53 }
  54
  55 static void ospf6_set_transport_class(void)
  56 {
  57 #ifdef IPTOS_PREC_INTERNETCONTROL
  58         setsockopt_ipv6_tclass(ospf6_sock, IPTOS_PREC_INTERNETCONTROL);
  59 #endif
  60 }
  61
  62 static void ospf6_set_checksum(void)
  63 {
  64         int offset = 12;
  65 #ifndef DISABLE_IPV6_CHECKSUM
  66         if (setsockopt(ospf6_sock, IPPROTO_IPV6, IPV6_CHECKSUM, &offset,
  67                        sizeof(offset))
  68             < 0)
  69                 zlog_warn("Network: set IPV6_CHECKSUM failed: %s",
  70                           safe_strerror(errno));
  71 #else
  72         zlog_warn("Network: Don't set IPV6_CHECKSUM");
  73 #endif /* DISABLE_IPV6_CHECKSUM */
  74 }
  75
  76 /* Make ospf6d's server socket. */
  77 int ospf6_serv_sock(void)
  78 {
  79         if (ospf6d_privs.change(ZPRIVS_RAISE))
  80                 zlog_err("ospf6_serv_sock: could not raise privs");
  81
  82         ospf6_sock = socket(AF_INET6, SOCK_RAW, IPPROTO_OSPFIGP);
  83         if (ospf6_sock < 0) {
  84                 zlog_warn("Network: can't create OSPF6 socket.");
  85                 if (ospf6d_privs.change(ZPRIVS_LOWER))
  86                         zlog_err("ospf_sock_init: could not lower privs");
  87                 return -1;
  88         }
  89         if (ospf6d_privs.change(ZPRIVS_LOWER))
  90                 zlog_err("ospf_sock_init: could not lower privs");
  91
  92 /* set socket options */
  93 #if 1
  94         sockopt_reuseaddr(ospf6_sock);
  95 #else
  96         ospf6_set_reuseaddr();
  97 #endif /*1*/
  98         ospf6_reset_mcastloop();
  99         ospf6_set_pktinfo();
 100         ospf6_set_transport_class();
 101         ospf6_set_checksum();
 102
 103         /* setup global in6_addr, allspf6 and alldr6 for later use */
 104         inet_pton(AF_INET6, ALLSPFROUTERS6, &allspfrouters6);
 105         inet_pton(AF_INET6, ALLDROUTERS6, &alldrouters6);
 106
 107         return 0;
 108 }
 109
 110 /* ospf6 set socket option */
 111 int ospf6_sso(ifindex_t ifindex, struct in6_addr *group, int option)
 112 {
 113         struct ipv6_mreq mreq6;
 114         int ret;
 115         int bufsize = (8 * 1024 * 1024);
 116
 117         assert(ifindex);
 118         mreq6.ipv6mr_interface = ifindex;
 119         memcpy(&mreq6.ipv6mr_multiaddr, group, sizeof(struct in6_addr));
 120
 121         ret = setsockopt(ospf6_sock, IPPROTO_IPV6, option, &mreq6,
 122                          sizeof(mreq6));
 123         if (ret < 0) {
 124                 zlog_err("Network: setsockopt (%d) on ifindex %d failed: %s",
 125                          option, ifindex, safe_strerror(errno));
 126                 return ret;
 127         }
 128
 129         setsockopt_so_sendbuf(ospf6_sock, bufsize);
 130         setsockopt_so_recvbuf(ospf6_sock, bufsize);
 131
 132         return 0;
 133 }
 134
 135 static int iov_count(struct iovec *iov)
 136 {
 137         int i;
 138         for (i = 0; iov[i].iov_base; i++)
 139                 ;
 140         return i;
 141 }
 142
 143 static int iov_totallen(struct iovec *iov)
 144 {
 145         int i;
 146         int totallen = 0;
 147         for (i = 0; iov[i].iov_base; i++)
 148                 totallen += iov[i].iov_len;
 149         return totallen;
 150 }
 151
 152 int ospf6_sendmsg(struct in6_addr *src, struct in6_addr *dst,
 153                   ifindex_t *ifindex, struct iovec *message)
 154 {
 155         int retval;
 156         struct msghdr smsghdr;
 157         struct cmsghdr *scmsgp;
 158         union {
 159                 struct cmsghdr hdr;
 160                 u_char buf[CMSG_SPACE(sizeof(struct in6_pktinfo))];
 161         } cmsgbuf;
 162         struct in6_pktinfo *pktinfo;
 163         struct sockaddr_in6 dst_sin6;
 164
 165         assert(dst);
 166         assert(*ifindex);
 167
 168         scmsgp = (struct cmsghdr *)&cmsgbuf;
 169         pktinfo = (struct in6_pktinfo *)(CMSG_DATA(scmsgp));
 170         memset(&dst_sin6, 0, sizeof(struct sockaddr_in6));
 171
 172         /* source address */
 173         pktinfo->ipi6_ifindex = *ifindex;
 174         if (src)
 175                 memcpy(&pktinfo->ipi6_addr, src, sizeof(struct in6_addr));
 176         else
 177                 memset(&pktinfo->ipi6_addr, 0, sizeof(struct in6_addr));
 178
 179         /* destination address */
 180         dst_sin6.sin6_family = AF_INET6;
 181 #ifdef SIN6_LEN
 182         dst_sin6.sin6_len = sizeof(struct sockaddr_in6);
 183 #endif /*SIN6_LEN*/
 184         memcpy(&dst_sin6.sin6_addr, dst, sizeof(struct in6_addr));
 185         dst_sin6.sin6_scope_id = *ifindex;
 186
 187         /* send control msg */
 188         scmsgp->cmsg_level = IPPROTO_IPV6;
 189         scmsgp->cmsg_type = IPV6_PKTINFO;
 190         scmsgp->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
 191         /* scmsgp = CMSG_NXTHDR (&smsghdr, scmsgp); */
 192
 193         /* send msg hdr */
 194         memset(&smsghdr, 0, sizeof(smsghdr));
 195         smsghdr.msg_iov = message;
 196         smsghdr.msg_iovlen = iov_count(message);
 197         smsghdr.msg_name = (caddr_t)&dst_sin6;
 198         smsghdr.msg_namelen = sizeof(struct sockaddr_in6);
 199         smsghdr.msg_control = (caddr_t)&cmsgbuf.buf;
 200         smsghdr.msg_controllen = sizeof(cmsgbuf.buf);
 201
 202         retval = sendmsg(ospf6_sock, &smsghdr, 0);
 203         if (retval != iov_totallen(message))
 204                 zlog_warn("sendmsg failed: ifindex: %d: %s (%d)", *ifindex,
 205                           safe_strerror(errno), errno);
 206
 207         return retval;
 208 }
 209
 210 int ospf6_recvmsg(struct in6_addr *src, struct in6_addr *dst,
 211                   ifindex_t *ifindex, struct iovec *message)
 212 {
 213         int retval;
 214         struct msghdr rmsghdr;
 215         struct cmsghdr *rcmsgp;
 216         u_char cmsgbuf[CMSG_SPACE(sizeof(struct in6_pktinfo))];
 217         struct in6_pktinfo *pktinfo;
 218         struct sockaddr_in6 src_sin6;
 219
 220         rcmsgp = (struct cmsghdr *)cmsgbuf;
 221         pktinfo = (struct in6_pktinfo *)(CMSG_DATA(rcmsgp));
 222         memset(&src_sin6, 0, sizeof(struct sockaddr_in6));
 223
 224         /* receive control msg */
 225         rcmsgp->cmsg_level = IPPROTO_IPV6;
 226         rcmsgp->cmsg_type = IPV6_PKTINFO;
 227         rcmsgp->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
 228         /* rcmsgp = CMSG_NXTHDR (&rmsghdr, rcmsgp); */
 229
 230         /* receive msg hdr */
 231         memset(&rmsghdr, 0, sizeof(rmsghdr));
 232         rmsghdr.msg_iov = message;
 233         rmsghdr.msg_iovlen = iov_count(message);
 234         rmsghdr.msg_name = (caddr_t)&src_sin6;
 235         rmsghdr.msg_namelen = sizeof(struct sockaddr_in6);
 236         rmsghdr.msg_control = (caddr_t)cmsgbuf;
 237         rmsghdr.msg_controllen = sizeof(cmsgbuf);
 238
 239         retval = recvmsg(ospf6_sock, &rmsghdr, 0);
 240         if (retval < 0)
 241                 zlog_warn("recvmsg failed: %s", safe_strerror(errno));
 242         else if (retval == iov_totallen(message))
 243                 zlog_warn("recvmsg read full buffer size: %d", retval);
 244
 245         /* source address */
 246         assert(src);
 247         memcpy(src, &src_sin6.sin6_addr, sizeof(struct in6_addr));
 248
 249         /* destination address */
 250         if (ifindex)
 251                 *ifindex = pktinfo->ipi6_ifindex;
 252         if (dst)
 253                 memcpy(dst, &pktinfo->ipi6_addr, sizeof(struct in6_addr));
 254
 255         return retval;
 256 }