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