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 #include "vrf.h"
  30
  31 #include "libospf.h"
  32 #include "ospf6_proto.h"
  33 #include "ospf6_top.h"
  34 #include "ospf6_network.h"
  35 #include "ospf6d.h"
  36
  37 struct in6_addr allspfrouters6;
  38 struct in6_addr alldrouters6;
  39
  40 /* setsockopt MulticastLoop to off */
  41 static void ospf6_reset_mcastloop(int ospf6_sock)
  42 {
  43         unsigned int off = 0;
  44         if (setsockopt(ospf6_sock, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &off,
  45                        sizeof(unsigned int))
  46             < 0)
  47                 zlog_warn("Network: reset IPV6_MULTICAST_LOOP failed: %s",
  48                           safe_strerror(errno));
  49 }
  50
  51 static void ospf6_set_pktinfo(int ospf6_sock)
  52 {
  53         setsockopt_ipv6_pktinfo(ospf6_sock, 1);
  54 }
  55
  56 static void ospf6_set_transport_class(int ospf6_sock)
  57 {
  58 #ifdef IPTOS_PREC_INTERNETCONTROL
  59         setsockopt_ipv6_tclass(ospf6_sock, IPTOS_PREC_INTERNETCONTROL);
  60 #endif
  61 }
  62
  63 static void ospf6_set_checksum(int ospf6_sock)
  64 {
  65         int offset = 12;
  66 #ifndef DISABLE_IPV6_CHECKSUM
  67         if (setsockopt(ospf6_sock, IPPROTO_IPV6, IPV6_CHECKSUM, &offset,
  68                        sizeof(offset))
  69             < 0)
  70                 zlog_warn("Network: set IPV6_CHECKSUM failed: %s",
  71                           safe_strerror(errno));
  72 #else
  73         zlog_warn("Network: Don't set IPV6_CHECKSUM");
  74 #endif /* DISABLE_IPV6_CHECKSUM */
  75 }
  76
  77 void ospf6_serv_close(int *ospf6_sock)
  78 {
  79         if (*ospf6_sock != -1) {
  80                 close(*ospf6_sock);
  81                 *ospf6_sock = -1;
  82                 return;
  83         }
  84 }
  85
  86 /* Make ospf6d's server socket. */
  87 int ospf6_serv_sock(struct ospf6 *ospf6)
  88 {
  89         int ospf6_sock;
  90
  91         if (ospf6->fd != -1)
  92                 return -1;
  93
  94         if (ospf6->vrf_id == VRF_UNKNOWN)
  95                 return -1;
  96
  97         frr_with_privs(&ospf6d_privs) {
  98
  99                 ospf6_sock = vrf_socket(AF_INET6, SOCK_RAW, IPPROTO_OSPFIGP,
 100                                         ospf6->vrf_id, ospf6->name);
 101                 if (ospf6_sock < 0) {
 102                         zlog_warn("Network: can't create OSPF6 socket.");
 103                         return -1;
 104                 }
 105         }
 106
 107 /* set socket options */
 108 #if 1
 109         sockopt_reuseaddr(ospf6_sock);
 110 #else
 111         ospf6_set_reuseaddr();
 112 #endif /*1*/
 113         ospf6_reset_mcastloop(ospf6_sock);
 114         ospf6_set_pktinfo(ospf6_sock);
 115         ospf6_set_transport_class(ospf6_sock);
 116         ospf6_set_checksum(ospf6_sock);
 117
 118         ospf6->fd = ospf6_sock;
 119         /* setup global in6_addr, allspf6 and alldr6 for later use */
 120         inet_pton(AF_INET6, ALLSPFROUTERS6, &allspfrouters6);
 121         inet_pton(AF_INET6, ALLDROUTERS6, &alldrouters6);
 122
 123         return 0;
 124 }
 125
 126 /* ospf6 set socket option */
 127 int ospf6_sso(ifindex_t ifindex, struct in6_addr *group, int option, int sockfd)
 128 {
 129         struct ipv6_mreq mreq6;
 130         int ret;
 131         int bufsize = (8 * 1024 * 1024);
 132
 133         if (sockfd == -1)
 134                 return -1;
 135
 136         assert(ifindex);
 137         mreq6.ipv6mr_interface = ifindex;
 138         memcpy(&mreq6.ipv6mr_multiaddr, group, sizeof(struct in6_addr));
 139
 140         ret = setsockopt(sockfd, IPPROTO_IPV6, option, &mreq6, sizeof(mreq6));
 141         if (ret < 0) {
 142                 flog_err_sys(
 143                         EC_LIB_SOCKET,
 144                         "Network: setsockopt (%d) on ifindex %d failed: %s",
 145                         option, ifindex, safe_strerror(errno));
 146                 return ret;
 147         }
 148
 149         setsockopt_so_sendbuf(sockfd, bufsize);
 150         setsockopt_so_recvbuf(sockfd, bufsize);
 151
 152         return 0;
 153 }
 154
 155 static int iov_count(struct iovec *iov)
 156 {
 157         int i;
 158         for (i = 0; iov[i].iov_base; i++)
 159                 ;
 160         return i;
 161 }
 162
 163 static int iov_totallen(struct iovec *iov)
 164 {
 165         int i;
 166         int totallen = 0;
 167         for (i = 0; iov[i].iov_base; i++)
 168                 totallen += iov[i].iov_len;
 169         return totallen;
 170 }
 171
 172 int ospf6_sendmsg(struct in6_addr *src, struct in6_addr *dst,
 173                   ifindex_t ifindex, struct iovec *message, int ospf6_sock)
 174 {
 175         int retval;
 176         struct msghdr smsghdr;
 177         struct cmsghdr *scmsgp;
 178         union {
 179                 struct cmsghdr hdr;
 180                 uint8_t buf[CMSG_SPACE(sizeof(struct in6_pktinfo))];
 181         } cmsgbuf;
 182         struct in6_pktinfo *pktinfo;
 183         struct sockaddr_in6 dst_sin6;
 184
 185         assert(dst);
 186
 187         memset(&cmsgbuf, 0, sizeof(cmsgbuf));
 188         scmsgp = (struct cmsghdr *)&cmsgbuf;
 189         pktinfo = (struct in6_pktinfo *)(CMSG_DATA(scmsgp));
 190         memset(&dst_sin6, 0, sizeof(struct sockaddr_in6));
 191
 192         /* source address */
 193         pktinfo->ipi6_ifindex = ifindex;
 194         if (src)
 195                 memcpy(&pktinfo->ipi6_addr, src, sizeof(struct in6_addr));
 196         else
 197                 memset(&pktinfo->ipi6_addr, 0, sizeof(struct in6_addr));
 198
 199         /* destination address */
 200         dst_sin6.sin6_family = AF_INET6;
 201 #ifdef SIN6_LEN
 202         dst_sin6.sin6_len = sizeof(struct sockaddr_in6);
 203 #endif /*SIN6_LEN*/
 204         memcpy(&dst_sin6.sin6_addr, dst, sizeof(struct in6_addr));
 205         dst_sin6.sin6_scope_id = ifindex;
 206
 207         /* send control msg */
 208         scmsgp->cmsg_level = IPPROTO_IPV6;
 209         scmsgp->cmsg_type = IPV6_PKTINFO;
 210         scmsgp->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
 211         /* scmsgp = CMSG_NXTHDR (&smsghdr, scmsgp); */
 212
 213         /* send msg hdr */
 214         memset(&smsghdr, 0, sizeof(smsghdr));
 215         smsghdr.msg_iov = message;
 216         smsghdr.msg_iovlen = iov_count(message);
 217         smsghdr.msg_name = (caddr_t)&dst_sin6;
 218         smsghdr.msg_namelen = sizeof(struct sockaddr_in6);
 219         smsghdr.msg_control = (caddr_t)&cmsgbuf.buf;
 220         smsghdr.msg_controllen = sizeof(cmsgbuf.buf);
 221
 222         retval = sendmsg(ospf6_sock, &smsghdr, 0);
 223         if (retval != iov_totallen(message))
 224                 zlog_warn("sendmsg failed: source: %pI6 Dest: %pI6 ifindex: %d: %s (%d)",
 225                           src, dst, ifindex,
 226                           safe_strerror(errno), errno);
 227
 228         return retval;
 229 }
 230
 231 int ospf6_recvmsg(struct in6_addr *src, struct in6_addr *dst,
 232                   ifindex_t *ifindex, struct iovec *message, int ospf6_sock)
 233 {
 234         int retval;
 235         struct msghdr rmsghdr;
 236         struct cmsghdr *rcmsgp;
 237         uint8_t cmsgbuf[CMSG_SPACE(sizeof(struct in6_pktinfo))];
 238         struct in6_pktinfo *pktinfo;
 239         struct sockaddr_in6 src_sin6;
 240
 241         rcmsgp = (struct cmsghdr *)cmsgbuf;
 242         pktinfo = (struct in6_pktinfo *)(CMSG_DATA(rcmsgp));
 243         memset(&src_sin6, 0, sizeof(struct sockaddr_in6));
 244
 245         /* receive control msg */
 246         rcmsgp->cmsg_level = IPPROTO_IPV6;
 247         rcmsgp->cmsg_type = IPV6_PKTINFO;
 248         rcmsgp->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
 249         /* rcmsgp = CMSG_NXTHDR (&rmsghdr, rcmsgp); */
 250
 251         /* receive msg hdr */
 252         memset(&rmsghdr, 0, sizeof(rmsghdr));
 253         rmsghdr.msg_iov = message;
 254         rmsghdr.msg_iovlen = iov_count(message);
 255         rmsghdr.msg_name = (caddr_t)&src_sin6;
 256         rmsghdr.msg_namelen = sizeof(struct sockaddr_in6);
 257         rmsghdr.msg_control = (caddr_t)cmsgbuf;
 258         rmsghdr.msg_controllen = sizeof(cmsgbuf);
 259
 260         retval = recvmsg(ospf6_sock, &rmsghdr, 0);
 261         if (retval < 0)
 262                 zlog_warn("recvmsg failed: %s", safe_strerror(errno));
 263         else if (retval == iov_totallen(message))
 264                 zlog_warn("recvmsg read full buffer size: %d", retval);
 265
 266         /* source address */
 267         assert(src);
 268         memcpy(src, &src_sin6.sin6_addr, sizeof(struct in6_addr));
 269
 270         /* destination address */
 271         if (ifindex)
 272                 *ifindex = pktinfo->ipi6_ifindex;
 273         if (dst)
 274                 memcpy(dst, &pktinfo->ipi6_addr, sizeof(struct in6_addr));
 275
 276         return retval;
 277 }