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finish incorporating ipv6 patches

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This commit is contained in:
Brendan O'Dea 2005-01-25 04:19:04 +00:00
parent 1c209703a3
commit 08360e49b4
9 changed files with 724 additions and 18 deletions
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85
icmp.c
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@ -1,6 +1,6 @@
// L2TPNS: icmp
char const *cvs_id_icmp = "$Id: icmp.c,v 1.6 2004-12-16 08:49:53 bodea Exp $";
char const *cvs_id_icmp = "$Id: icmp.c,v 1.7 2005-01-25 04:19:05 bodea Exp $";
#include <arpa/inet.h>
#include <netdb.h>
@ -8,6 +8,7 @@ char const *cvs_id_icmp = "$Id: icmp.c,v 1.6 2004-12-16 08:49:53 bodea Exp $";
#include <asm/types.h>
#include <linux/ip.h>
#include <linux/icmp.h>
#include <netinet/icmp6.h>
#include <stdio.h>
#include <sys/socket.h>
#include <unistd.h>
@ -19,6 +20,14 @@ char const *cvs_id_icmp = "$Id: icmp.c,v 1.6 2004-12-16 08:49:53 bodea Exp $";
static uint16_t _checksum(unsigned char *addr, int count);
struct ipv6_pseudo_hdr {
struct in6_addr src;
struct in6_addr dest;
uint32_t ulp_length;
uint32_t zero : 24;
uint32_t nexthdr : 8;
};
void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, char *packet, int packet_len)
{
char buf[128] = {0};
@ -89,3 +98,77 @@ static uint16_t _checksum(unsigned char *addr, int count)
return htons((uint16_t) sum);
}
void send_ipv6_ra(tunnelidt t, sessionidt s, struct in6_addr *ip)
{
struct nd_opt_prefix_info *pinfo;
struct ipv6_pseudo_hdr *phdr;
uint8_t b[MAXETHER + 20];
uint8_t c[MAXETHER + 20];
int l;
uint8_t *o;
LOG(3, s, t, "Sending IPv6 RA\n");
memset(b, 0, sizeof(b));
o = makeppp(b, sizeof(b), 0, 0, t, s, PPPIPV6);
if (!o)
{
LOG(3, s, t, "failed to send IPv6 RA\n");
return;
}
*o = 0x60; // IPv6
*(o+1) = 0;
*(o+5) = 48; // Length of payload (not header)
*(o+6) = 58; // icmp6 is next
*(o+7) = 255; // Hop limit
memset(o+8, 0, 16); // source = FE80::1
*(o+8) = 0xFE;
*(o+9) = 0x80;
*(o+23) = 1;
if (ip != NULL)
memcpy(o+24, ip, 16); // dest = ip
else
{
// FF02::1 - all hosts
*(o+24) = 0xFF;
*(o+25) = 2;
*(o+39) = 1;
}
*(o+40) = 134; // RA message
*(o+41) = 0; // Code
*(o+42) = *(o+43) = 0; // Checksum
*(o+44) = 64; // Hop count
*(o+45) = 0; // Flags
*(o+46) = *(o+47) = 255; // Lifetime
*(uint32_t *)(o+48) = 0; // Reachable time
*(uint32_t *)(o+52) = 0; // Retrans timer
pinfo = (struct nd_opt_prefix_info *)(o+56);
pinfo->nd_opt_pi_type = ND_OPT_PREFIX_INFORMATION;
pinfo->nd_opt_pi_len = 4;
pinfo->nd_opt_pi_prefix_len = 64; // prefix length
pinfo->nd_opt_pi_flags_reserved = ND_OPT_PI_FLAG_ONLINK;
pinfo->nd_opt_pi_flags_reserved |= ND_OPT_PI_FLAG_AUTO;
pinfo->nd_opt_pi_valid_time = htonl(2592000);
pinfo->nd_opt_pi_preferred_time = htonl(604800);
pinfo->nd_opt_pi_reserved2 = 0;
pinfo->nd_opt_pi_prefix = config->ipv6_prefix;
l = sizeof(*pinfo) + 56;
memset(c, 0, sizeof(c));
phdr = (struct ipv6_pseudo_hdr *) c;
memcpy(&phdr->src, o+8, 16);
memcpy(&phdr->dest, o+24, 16);
phdr->ulp_length = htonl(l - 40);
phdr->nexthdr = IPPROTO_ICMPV6;
memcpy(c + sizeof(*phdr), o + 40, l - 40);
// Checksum is over the icmp6 payload plus the pseudo header
*(uint16_t *)(o+42) = _checksum(c, l - 40 + sizeof(*phdr));
tunnelsend(b, l + (o-b), t); // send it...
return;
}