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 #include "lib_errors.h"
  29
  30 #include "libospf.h"
  31 #include "ospf6_proto.h"
  32 #include "ospf6_network.h"
  33 #include "ospf6d.h"
  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         unsigned int off = 0;
  43         if (setsockopt(ospf6_sock, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &off,
  44                        sizeof(unsigned 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 void ospf6_serv_close(void)
  77 {
  78         if (ospf6_sock > 0) {
  79                 close(ospf6_sock);
  80                 ospf6_sock = -1;
  81                 return;
  82         }
  83 }
  84
  85 /* Make ospf6d's server socket. */
  86 int ospf6_serv_sock(void)
  87 {
  88         frr_with_privs(&ospf6d_privs) {
  89
  90                 ospf6_sock = socket(AF_INET6, SOCK_RAW, IPPROTO_OSPFIGP);
  91                 if (ospf6_sock < 0) {
  92                         zlog_warn("Network: can't create OSPF6 socket.");
  93                         return -1;
  94                 }
  95         }
  96
  97 /* set socket options */
  98 #if 1
  99         sockopt_reuseaddr(ospf6_sock);
 100 #else
 101         ospf6_set_reuseaddr();
 102 #endif /*1*/
 103         ospf6_reset_mcastloop();
 104         ospf6_set_pktinfo();
 105         ospf6_set_transport_class();
 106         ospf6_set_checksum();
 107
 108         /* setup global in6_addr, allspf6 and alldr6 for later use */
 109         inet_pton(AF_INET6, ALLSPFROUTERS6, &allspfrouters6);
 110         inet_pton(AF_INET6, ALLDROUTERS6, &alldrouters6);
 111
 112         return 0;
 113 }
 114
 115 /* ospf6 set socket option */
 116 int ospf6_sso(ifindex_t ifindex, struct in6_addr *group, int option)
 117 {
 118         struct ipv6_mreq mreq6;
 119         int ret;
 120         int bufsize = (8 * 1024 * 1024);
 121
 122         assert(ifindex);
 123         mreq6.ipv6mr_interface = ifindex;
 124         memcpy(&mreq6.ipv6mr_multiaddr, group, sizeof(struct in6_addr));
 125
 126         ret = setsockopt(ospf6_sock, IPPROTO_IPV6, option, &mreq6,
 127                          sizeof(mreq6));
 128         if (ret < 0) {
 129                 flog_err_sys(
 130                         EC_LIB_SOCKET,
 131                         "Network: setsockopt (%d) on ifindex %d failed: %s",
 132                         option, ifindex, safe_strerror(errno));
 133                 return ret;
 134         }
 135
 136         setsockopt_so_sendbuf(ospf6_sock, bufsize);
 137         setsockopt_so_recvbuf(ospf6_sock, bufsize);
 138
 139         return 0;
 140 }
 141
 142 static int iov_count(struct iovec *iov)
 143 {
 144         int i;
 145         for (i = 0; iov[i].iov_base; i++)
 146                 ;
 147         return i;
 148 }
 149
 150 static int iov_totallen(struct iovec *iov)
 151 {
 152         int i;
 153         int totallen = 0;
 154         for (i = 0; iov[i].iov_base; i++)
 155                 totallen += iov[i].iov_len;
 156         return totallen;
 157 }
 158
 159 int ospf6_sendmsg(struct in6_addr *src, struct in6_addr *dst,
 160                   ifindex_t *ifindex, struct iovec *message)
 161 {
 162         int retval;
 163         struct msghdr smsghdr;
 164         struct cmsghdr *scmsgp;
 165         union {
 166                 struct cmsghdr hdr;
 167                 uint8_t buf[CMSG_SPACE(sizeof(struct in6_pktinfo))];
 168         } cmsgbuf;
 169         struct in6_pktinfo *pktinfo;
 170         struct sockaddr_in6 dst_sin6;
 171
 172         assert(dst);
 173         assert(*ifindex);
 174
 175         memset(&cmsgbuf, 0, sizeof(cmsgbuf));
 176         scmsgp = (struct cmsghdr *)&cmsgbuf;
 177         pktinfo = (struct in6_pktinfo *)(CMSG_DATA(scmsgp));
 178         memset(&dst_sin6, 0, sizeof(struct sockaddr_in6));
 179
 180         /* source address */
 181         pktinfo->ipi6_ifindex = *ifindex;
 182         if (src)
 183                 memcpy(&pktinfo->ipi6_addr, src, sizeof(struct in6_addr));
 184         else
 185                 memset(&pktinfo->ipi6_addr, 0, sizeof(struct in6_addr));
 186
 187         /* destination address */
 188         dst_sin6.sin6_family = AF_INET6;
 189 #ifdef SIN6_LEN
 190         dst_sin6.sin6_len = sizeof(struct sockaddr_in6);
 191 #endif /*SIN6_LEN*/
 192         memcpy(&dst_sin6.sin6_addr, dst, sizeof(struct in6_addr));
 193         dst_sin6.sin6_scope_id = *ifindex;
 194
 195         /* send control msg */
 196         scmsgp->cmsg_level = IPPROTO_IPV6;
 197         scmsgp->cmsg_type = IPV6_PKTINFO;
 198         scmsgp->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
 199         /* scmsgp = CMSG_NXTHDR (&smsghdr, scmsgp); */
 200
 201         /* send msg hdr */
 202         memset(&smsghdr, 0, sizeof(smsghdr));
 203         smsghdr.msg_iov = message;
 204         smsghdr.msg_iovlen = iov_count(message);
 205         smsghdr.msg_name = (caddr_t)&dst_sin6;
 206         smsghdr.msg_namelen = sizeof(struct sockaddr_in6);
 207         smsghdr.msg_control = (caddr_t)&cmsgbuf.buf;
 208         smsghdr.msg_controllen = sizeof(cmsgbuf.buf);
 209
 210         retval = sendmsg(ospf6_sock, &smsghdr, 0);
 211         if (retval != iov_totallen(message))
 212                 zlog_warn("sendmsg failed: ifindex: %d: %s (%d)", *ifindex,
 213                           safe_strerror(errno), errno);
 214
 215         return retval;
 216 }
 217
 218 int ospf6_recvmsg(struct in6_addr *src, struct in6_addr *dst,
 219                   ifindex_t *ifindex, struct iovec *message)
 220 {
 221         int retval;
 222         struct msghdr rmsghdr;
 223         struct cmsghdr *rcmsgp;
 224         uint8_t cmsgbuf[CMSG_SPACE(sizeof(struct in6_pktinfo))];
 225         struct in6_pktinfo *pktinfo;
 226         struct sockaddr_in6 src_sin6;
 227
 228         rcmsgp = (struct cmsghdr *)cmsgbuf;
 229         pktinfo = (struct in6_pktinfo *)(CMSG_DATA(rcmsgp));
 230         memset(&src_sin6, 0, sizeof(struct sockaddr_in6));
 231
 232         /* receive control msg */
 233         rcmsgp->cmsg_level = IPPROTO_IPV6;
 234         rcmsgp->cmsg_type = IPV6_PKTINFO;
 235         rcmsgp->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
 236         /* rcmsgp = CMSG_NXTHDR (&rmsghdr, rcmsgp); */
 237
 238         /* receive msg hdr */
 239         memset(&rmsghdr, 0, sizeof(rmsghdr));
 240         rmsghdr.msg_iov = message;
 241         rmsghdr.msg_iovlen = iov_count(message);
 242         rmsghdr.msg_name = (caddr_t)&src_sin6;
 243         rmsghdr.msg_namelen = sizeof(struct sockaddr_in6);
 244         rmsghdr.msg_control = (caddr_t)cmsgbuf;
 245         rmsghdr.msg_controllen = sizeof(cmsgbuf);
 246
 247         retval = recvmsg(ospf6_sock, &rmsghdr, 0);
 248         if (retval < 0)
 249                 zlog_warn("recvmsg failed: %s", safe_strerror(errno));
 250         else if (retval == iov_totallen(message))
 251                 zlog_warn("recvmsg read full buffer size: %d", retval);
 252
 253         /* source address */
 254         assert(src);
 255         memcpy(src, &src_sin6.sin6_addr, sizeof(struct in6_addr));
 256
 257         /* destination address */
 258         if (ifindex)
 259                 *ifindex = pktinfo->ipi6_ifindex;
 260         if (dst)
 261                 memcpy(dst, &pktinfo->ipi6_addr, sizeof(struct in6_addr));
 262
 263         return retval;
 264 }