along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- $Id: route.c,v 1.1.2.32 2002/03/12 14:25:04 guus Exp $
+ $Id: route.c,v 1.1.2.37 2002/03/19 00:08:23 guus Exp $
*/
#include "config.h"
#else
#include <net/ethernet.h>
#endif
-#ifdef NEIGHBORSOL
#include <netinet/ip6.h>
#include <netinet/icmp6.h>
-#endif
#include <netinet/if_ether.h>
#include <utils.h>
#include <xalloc.h>
return subnet->owner;
}
-#ifdef NEIGHBORSOL
-unsigned short int ipv6_cksum(short int *data, int len, unsigned short int cksum)
+unsigned short int inet_checksum(unsigned short int *data, int len, unsigned short int prevsum)
{
+ unsigned long int checksum = prevsum ^ 0xFFFF;
+
while(len--)
- {
- cksum += ntohs(*data++);
- }
- return cksum;
+ checksum += ntohs(*data++);
+
+ while(checksum >> 16)
+ checksum = (checksum & 0xFFFF) + (checksum >> 16);
+
+ return checksum ^ 0xFFFF;
}
void route_neighborsol(vpn_packet_t *packet)
struct nd_neighbor_solicit *ns;
struct nd_opt_hdr *opt;
subnet_t *subnet;
- short int cksum;
+ short unsigned int checksum;
struct {
struct in6_addr ip6_src; /* source address */
cp
hdr = (struct ip6_hdr *)(packet->data + 14);
- ns = (struct nd_neighbor_solicit *)(packet->data + 14 + sizeof(struct ip6_hdr));
- opt = (struct nd_opt_hdr *)(packet->data + 14 + sizeof(struct ip6_hdr) + sizeof(struct nd_neighbor_solicit));
+ ns = (struct nd_neighbor_solicit *)(packet->data + 14 + sizeof(*hdr));
+ opt = (struct nd_opt_hdr *)(packet->data + 14 + sizeof(*hdr) + sizeof(*ns));
/* First, snatch the source address from the neighbor solicitation packet */
return;
}
+ /* Create pseudo header */
+
+ memcpy(&pseudo.ip6_src, &hdr->ip6_src, 16);
+ memcpy(&pseudo.ip6_dst, &hdr->ip6_dst, 16);
+ pseudo.length = htonl(sizeof(*ns) + sizeof(*opt) + 6);
+ pseudo.junk[0] = pseudo.junk[1] = pseudo.junk[2] = 0;
+ pseudo.junk[3] = IPPROTO_ICMPV6;
+
+ /* Generate checksum */
+
+ checksum = inet_checksum((unsigned short int *)&pseudo, sizeof(pseudo)/2, ~0);
+ checksum = inet_checksum((unsigned short int *)ns, sizeof(*ns)/2 + 4, checksum);
+
+ if(checksum)
+ {
+ if(debug_lvl >= DEBUG_TRAFFIC)
+ syslog(LOG_WARNING, _("Cannot route packet: checksum error for neighbor solicitation request"));
+ return;
+ }
+
/* Check if the IPv6 address exists on the VPN */
-#if 0
+
subnet = lookup_subnet_ipv6((ipv6_t *)&ns->nd_ns_target);
if(!subnet)
if(debug_lvl >= DEBUG_TRAFFIC)
{
syslog(LOG_WARNING, _("Cannot route packet: neighbor solicitation request for unknown address %hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx"),
- ntohs(ns->nd_ns_target.s6_addr16[0]), ntohs(ns->nd_ns_target.s6_addr16[1]), ntohs(ns->nd_ns_target.s6_addr16[2]), ntohs(ns->nd_ns_target.s6_addr16[3]),
- ntohs(ns->nd_ns_target.s6_addr16[4]), ntohs(ns->nd_ns_target.s6_addr16[5]), ntohs(ns->nd_ns_target.s6_addr16[6]), ntohs(ns->nd_ns_target.s6_addr16[7]));
+ ntohs(((uint16_t *)&ns->nd_ns_target)[0]), ntohs(((uint16_t *)&ns->nd_ns_target)[1]), ntohs(((uint16_t *)&ns->nd_ns_target)[2]), ntohs(((uint16_t *)&ns->nd_ns_target)[3]),
+ ntohs(((uint16_t *)&ns->nd_ns_target)[4]), ntohs(((uint16_t *)&ns->nd_ns_target)[5]), ntohs(((uint16_t *)&ns->nd_ns_target)[6]), ntohs(((uint16_t *)&ns->nd_ns_target)[7]));
}
return;
if(subnet->owner == myself)
return; /* silently ignore */
-#endif
-
- syslog(LOG_DEBUG, "Neighbor solicitation request with checksum %hx", ntohs(ns->nd_ns_hdr.icmp6_cksum));
-
- /* Create pseudo header */
- memcpy(&pseudo.ip6_src, &hdr->ip6_src, 16);
- memcpy(&pseudo.ip6_dst, &hdr->ip6_dst, 16);
- pseudo.length = htonl(sizeof(*ns));
- pseudo.junk[0] = pseudo.junk[1] = pseudo.junk[2] = 0;
- pseudo.junk[3] = IPPROTO_ICMPV6;
-
- /* Generate checksum */
-
- ns->nd_ns_hdr.icmp6_cksum = 0;
-
- cksum = ipv6_cksum((short int *)&pseudo, sizeof(pseudo)/2, 0);
-
- syslog(LOG_DEBUG, "Our checksum %hx", cksum);
-
- cksum = ipv6_cksum((short int *)ns, sizeof(*ns)/2, cksum);
-
- syslog(LOG_DEBUG, "Our checksum %hx", cksum);
-
- cksum = ipv6_cksum((short int *)opt, sizeof(*opt)/2, cksum);
-
- syslog(LOG_DEBUG, "Our checksum %hx", cksum);
-
- /* Create neighbor advertation reply */
+ /* Create neighbor advertation reply */
memcpy(packet->data, packet->data + ETHER_ADDR_LEN, ETHER_ADDR_LEN); /* copy destination address */
packet->data[ETHER_ADDR_LEN*2 - 1] ^= 0xFF; /* mangle source address so it looks like it's not from us */
ns->nd_ns_hdr.icmp6_cksum = 0;
ns->nd_ns_hdr.icmp6_type = ND_NEIGHBOR_ADVERT;
+ ns->nd_ns_hdr.icmp6_dataun.icmp6_un_data8[0] = 0x40; /* Set solicited flag */
+ ns->nd_ns_hdr.icmp6_dataun.icmp6_un_data8[1] = ns->nd_ns_hdr.icmp6_dataun.icmp6_un_data8[2] = ns->nd_ns_hdr.icmp6_dataun.icmp6_un_data8[3] = 0;
opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
/* Create pseudo header */
memcpy(&pseudo.ip6_src, &hdr->ip6_src, 16);
memcpy(&pseudo.ip6_dst, &hdr->ip6_dst, 16);
- pseudo.length = htonl(sizeof(struct icmp6_hdr));
+ pseudo.length = htonl(sizeof(*ns) + sizeof(*opt) + 6);
pseudo.junk[0] = pseudo.junk[1] = pseudo.junk[2] = 0;
pseudo.junk[3] = IPPROTO_ICMPV6;
/* Generate checksum */
- cksum = ipv6_cksum((short int *)&pseudo, sizeof(pseudo)/2, 0);
- cksum = ipv6_cksum((short int *)ns, sizeof(*ns)/2, cksum);
+ checksum = inet_checksum((unsigned short int *)&pseudo, sizeof(pseudo)/2, ~0);
+ checksum = inet_checksum((unsigned short int *)ns, sizeof(*ns)/2 + 4, checksum);
+
+ ns->nd_ns_hdr.icmp6_cksum = htons(checksum);
- ns->nd_ns_hdr.icmp6_cksum = htons(cksum);
-
write_packet(packet);
cp
}
-#endif
void route_arp(vpn_packet_t *packet)
{
n = route_ipv4(packet);
break;
case 0x86DD:
- n = route_ipv6(packet);
-#ifdef NEIGHBORSOL
- if(!n && packet->data[0] == 0x33 && packet->data[1] == 0x33 && packet->data[2] == 0xff)
+ if(packet->data[20] == IPPROTO_ICMPV6 && packet->data[54] == ND_NEIGHBOR_SOLICIT)
{
route_neighborsol(packet);
return;
}
-#endif
+ n = route_ipv6(packet);
break;
case 0x0806:
route_arp(packet);
projects / tinc / blobdiff