1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368
|
/*
*
* Copyright (C) 2000 Robert Olsson.
* Swedish University of Agricultural Sciences
*
* 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.
*/
/*
* This work includes work with the following copywrite:
*
* Copyright (C) 1997, 2000 Kunihiro Ishiguro
*
*/
/*
* Thanks to Jens Ls at Swedish University of Agricultural Sciences
* for reviewing and tests.
*/
#include <zebra.h>
#ifdef HAVE_IRDP
#include "if.h"
#include "vty.h"
#include "sockunion.h"
#include "prefix.h"
#include "command.h"
#include "memory.h"
#include "stream.h"
#include "ioctl.h"
#include "connected.h"
#include "log.h"
#include "zclient.h"
#include "thread.h"
#include "zebra/interface.h"
#include "zebra/rtadv.h"
#include "zebra/rib.h"
#include "zebra/zserv.h"
#include "zebra/redistribute.h"
#include "zebra/irdp.h"
#include <netinet/ip_icmp.h>
#include "if.h"
#include "checksum.h"
#include "sockunion.h"
#include "log.h"
#include "sockopt.h"
/* GLOBAL VARS */
int irdp_sock = -1;
extern struct zebra_t zebrad;
extern struct thread *t_irdp_raw;
static void
parse_irdp_packet(char *p,
int len,
struct interface *ifp)
{
struct ip *ip = (struct ip *)p ;
struct icmphdr *icmp;
struct in_addr src;
int ip_hlen, iplen, datalen;
struct zebra_if *zi;
struct irdp_interface *irdp;
zi = ifp->info;
if (!zi)
return;
irdp = &zi->irdp;
if (!irdp)
return;
ip_hlen = ip->ip_hl << 2;
sockopt_iphdrincl_swab_systoh (ip);
iplen = ip->ip_len;
datalen = len - ip_hlen;
src = ip->ip_src;
if (len != iplen)
{
zlog_err ("IRDP: RX length doesnt match IP length");
return;
}
if (iplen < ICMP_MINLEN)
{
zlog_err ("IRDP: RX ICMP packet too short from %s\n",
inet_ntoa (src));
return;
}
/* XXX: RAW doesnt receive link-layer, surely? ??? */
/* Check so we don't checksum packets longer than oure RX_BUF - (ethlen +
len of IP-header) 14+20 */
if (iplen > IRDP_RX_BUF-34)
{
zlog_err ("IRDP: RX ICMP packet too long from %s\n",
inet_ntoa (src));
return;
}
icmp = (struct icmphdr *) (p+ip_hlen);
/* check icmp checksum */
if (in_cksum (icmp, datalen) != icmp->checksum)
{
zlog_warn ("IRDP: RX ICMP packet from %s. Bad checksum, silently ignored",
inet_ntoa (src));
return;
}
/* Handle just only IRDP */
if (!(icmp->type == ICMP_ROUTERADVERT
|| icmp->type == ICMP_ROUTERSOLICIT))
return;
if (icmp->code != 0)
{
zlog_warn ("IRDP: RX packet type %d from %s. Bad ICMP type code,"
" silently ignored",
icmp->type, inet_ntoa (src));
return;
}
if (! ((ntohl (ip->ip_dst.s_addr) == INADDR_BROADCAST)
&& (irdp->flags & IF_BROADCAST))
||
(ntohl (ip->ip_dst.s_addr) == INADDR_ALLRTRS_GROUP
&& !(irdp->flags & IF_BROADCAST)))
{
zlog_warn ("IRDP: RX illegal from %s to %s while %s operates in %s\n",
inet_ntoa (src),
ntohl (ip->ip_dst.s_addr) == INADDR_ALLRTRS_GROUP ?
"multicast" : inet_ntoa (ip->ip_dst),
ifp->name,
irdp->flags & IF_BROADCAST ? "broadcast" : "multicast");
zlog_warn ("IRDP: Please correct settings\n");
return;
}
switch (icmp->type)
{
case ICMP_ROUTERADVERT:
break;
case ICMP_ROUTERSOLICIT:
if(irdp->flags & IF_DEBUG_MESSAGES)
zlog_debug ("IRDP: RX Solicit on %s from %s\n",
ifp->name,
inet_ntoa (src));
process_solicit(ifp);
break;
default:
zlog_warn ("IRDP: RX type %d from %s. Bad ICMP type, silently ignored",
icmp->type,
inet_ntoa (src));
}
}
static int
irdp_recvmsg (int sock, u_char *buf, int size, int *ifindex)
{
struct msghdr msg;
struct iovec iov;
char adata[CMSG_SPACE( SOPT_SIZE_CMSG_PKTINFO_IPV4() )];
int ret;
msg.msg_name = (void *)0;
msg.msg_namelen = 0;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_control = (void *) adata;
msg.msg_controllen = sizeof adata;
iov.iov_base = buf;
iov.iov_len = size;
ret = recvmsg (sock, &msg, 0);
if (ret < 0) {
zlog_warn("IRDP: recvmsg: read error %s", safe_strerror(errno));
return ret;
}
if (msg.msg_flags & MSG_TRUNC) {
zlog_warn("IRDP: recvmsg: truncated message");
return ret;
}
if (msg.msg_flags & MSG_CTRUNC) {
zlog_warn("IRDP: recvmsg: truncated control message");
return ret;
}
*ifindex = getsockopt_ifindex (AF_INET, &msg);
return ret;
}
int irdp_read_raw(struct thread *r)
{
struct interface *ifp;
struct zebra_if *zi;
struct irdp_interface *irdp;
char buf[IRDP_RX_BUF];
int ret, ifindex = 0;
int irdp_sock = THREAD_FD (r);
t_irdp_raw = thread_add_read (zebrad.master, irdp_read_raw, NULL, irdp_sock);
ret = irdp_recvmsg (irdp_sock, (u_char *) buf, IRDP_RX_BUF, &ifindex);
if (ret < 0) zlog_warn ("IRDP: RX Error length = %d", ret);
ifp = if_lookup_by_index(ifindex);
if(! ifp ) return ret;
zi= ifp->info;
if(! zi ) return ret;
irdp = &zi->irdp;
if(! irdp ) return ret;
if(! (irdp->flags & IF_ACTIVE)) {
if(irdp->flags & IF_DEBUG_MISC)
zlog_debug("IRDP: RX ICMP for disabled interface %s\n", ifp->name);
return 0;
}
if(irdp->flags & IF_DEBUG_PACKET) {
int i;
zlog_debug("IRDP: RX (idx %d) ", ifindex);
for(i=0; i < ret; i++) zlog_debug( "IRDP: RX %x ", buf[i]&0xFF);
}
parse_irdp_packet(buf, ret, ifp);
return ret;
}
void
send_packet(struct interface *ifp,
struct stream *s,
u_int32_t dst,
struct prefix *p,
u_int32_t ttl)
{
static struct sockaddr_in sockdst = {AF_INET};
struct ip *ip;
struct icmphdr *icmp;
struct msghdr *msg;
struct cmsghdr *cmsg;
struct iovec iovector;
char msgbuf[256];
char buf[256];
struct in_pktinfo *pktinfo;
u_long src;
int on;
if (!(ifp->flags & IFF_UP))
return;
if (p)
src = ntohl(p->u.prefix4.s_addr);
else
src = 0; /* Is filled in */
ip = (struct ip *) buf;
ip->ip_hl = sizeof(struct ip) >> 2;
ip->ip_v = IPVERSION;
ip->ip_tos = 0xC0;
ip->ip_off = 0L;
ip->ip_p = 1; /* IP_ICMP */
ip->ip_ttl = ttl;
ip->ip_src.s_addr = src;
ip->ip_dst.s_addr = dst;
icmp = (struct icmphdr *) (buf + sizeof (struct ip));
/* Merge IP header with icmp packet */
assert (stream_get_endp(s) < (sizeof (buf) - sizeof (struct ip)));
stream_get(icmp, s, stream_get_endp(s));
/* icmp->checksum is already calculated */
ip->ip_len = sizeof(struct ip) + stream_get_endp(s);
on = 1;
if (setsockopt(irdp_sock, IPPROTO_IP, IP_HDRINCL,
(char *) &on, sizeof(on)) < 0)
zlog_warn("sendto %s", safe_strerror (errno));
if(dst == INADDR_BROADCAST ) {
on = 1;
if (setsockopt(irdp_sock, SOL_SOCKET, SO_BROADCAST,
(char *) &on, sizeof(on)) < 0)
zlog_warn("sendto %s", safe_strerror (errno));
}
if(dst != INADDR_BROADCAST) {
on = 0;
if( setsockopt(irdp_sock,IPPROTO_IP, IP_MULTICAST_LOOP,
(char *)&on,sizeof(on)) < 0)
zlog_warn("sendto %s", safe_strerror (errno));
}
memset(&sockdst,0,sizeof(sockdst));
sockdst.sin_family=AF_INET;
sockdst.sin_addr.s_addr = dst;
cmsg = (struct cmsghdr *) (msgbuf + sizeof(struct msghdr));
cmsg->cmsg_len = sizeof(struct cmsghdr) + sizeof(struct in_pktinfo);
cmsg->cmsg_level = SOL_IP;
cmsg->cmsg_type = IP_PKTINFO;
pktinfo = (struct in_pktinfo *) CMSG_DATA(cmsg);
pktinfo->ipi_ifindex = ifp->ifindex;
pktinfo->ipi_spec_dst.s_addr = src;
pktinfo->ipi_addr.s_addr = src;
iovector.iov_base = (void *) buf;
iovector.iov_len = ip->ip_len;
msg = (struct msghdr *) msgbuf;
msg->msg_name = &sockdst;
msg->msg_namelen = sizeof(sockdst);
msg->msg_iov = &iovector;
msg->msg_iovlen = 1;
msg->msg_control = cmsg;
msg->msg_controllen = cmsg->cmsg_len;
sockopt_iphdrincl_swab_htosys (ip);
if (sendmsg(irdp_sock, msg, 0) < 0) {
zlog_warn("sendto %s", safe_strerror (errno));
}
/* printf("TX on %s idx %d\n", ifp->name, ifp->ifindex); */
}
#endif /* HAVE_IRDP */
|