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[l2tpns.git] / icmp.c
diff --git a/icmp.c b/icmp.c
index 6d90467..d03b60b 100644 (file)
--- a/icmp.c
+++ b/icmp.c
@@ -1,31 +1,19 @@
 // L2TPNS: icmp
 
 #include <arpa/inet.h>
 // L2TPNS: icmp
 
 #include <arpa/inet.h>
-#include <netdb.h>
-#include <netinet/in.h>
-#include <asm/types.h>
 #include <linux/ip.h>
 #include <linux/icmp.h>
 #include <netinet/icmp6.h>
 #include <linux/ip.h>
 #include <linux/icmp.h>
 #include <netinet/icmp6.h>
-#include <stdio.h>
-#include <sys/socket.h>
 #include <unistd.h>
 #include <unistd.h>
-#include <sys/types.h>
-#include <sys/wait.h>
-#include <memory.h>
+#include <linux/rtnetlink.h>
+#include <netinet/ip6.h>
 
 
+#include "dhcp6.h"
 #include "l2tpns.h"
 #include "l2tpns.h"
+#include "ipv6_u.h"
 
 static uint16_t _checksum(uint8_t *addr, int count);
 
 
 static uint16_t _checksum(uint8_t *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, uint8_t *packet, int packet_len)
 {
        char buf[128] = {0};
 void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, uint8_t *packet, int packet_len)
 {
        char buf[128] = {0};
@@ -84,11 +72,11 @@ static uint16_t _checksum(uint8_t *addr, int count)
 
        for (; count > 1; count -= 2)
        {
 
        for (; count > 1; count -= 2)
        {
-               sum += ntohs(*(uint32_t *) addr);
+               sum += ntohs(*(uint16_t *) addr);
                addr += 2;
        }
 
                addr += 2;
        }
 
-       if (count > 1) sum += *(unsigned char *)addr;
+       if (count > 0) sum += *(unsigned char *)addr;
 
        // take only 16 bits out of the 32 bit sum and add up the carries
        while (sum >> 16)
 
        // take only 16 bits out of the 32 bit sum and add up the carries
        while (sum >> 16)
@@ -103,73 +91,81 @@ static uint16_t _checksum(uint8_t *addr, int count)
 void send_ipv6_ra(sessionidt s, tunnelidt t, struct in6_addr *ip)
 {
        struct nd_opt_prefix_info *pinfo;
 void send_ipv6_ra(sessionidt s, tunnelidt t, struct in6_addr *ip)
 {
        struct nd_opt_prefix_info *pinfo;
-       struct ipv6_pseudo_hdr *phdr;
+       struct ip6_hdr *p_ip6_hdr;
+       struct nd_router_advert *p_nra;
        uint8_t b[MAXETHER + 20];
        uint8_t b[MAXETHER + 20];
-       uint8_t c[MAXETHER + 20];
+       struct ipv6_pseudo_hdr pseudo_hdr;
        int l;
        int l;
-       uint8_t *o;
 
        LOG(3, s, t, "Sending IPv6 RA\n");
 
        LOG(3, s, t, "Sending IPv6 RA\n");
-               
+
        memset(b, 0, sizeof(b));
        memset(b, 0, sizeof(b));
-       o = makeppp(b, sizeof(b), 0, 0, s, t, PPPIPV6, 0, 0, 0);
+       p_ip6_hdr = (struct ip6_hdr *) makeppp(b, sizeof(b), 0, 0, s, t, PPPIPV6, 0, 0, 0);
 
 
-       if (!o)
+       if (!p_ip6_hdr)
        {
                LOG(3, s, t, "failed to send IPv6 RA\n");
                return;
        }
 
        {
                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;
+       p_ip6_hdr->ip6_vfc = 0x60;                      // IPv6
+       p_ip6_hdr->ip6_plen = 0;                        // Length of payload (not header) (calculation below)
+       p_ip6_hdr->ip6_nxt = IPPROTO_ICMPV6;                    // icmp6 is next
+       p_ip6_hdr->ip6_hlim = 255;                      // Hop limit
+       // IPv6 0xFE80::1
+       inet_pton(AF_INET6, "FE80::1", &p_ip6_hdr->ip6_src.s6_addr);
+
        if (ip != NULL)
        if (ip != NULL)
-               memcpy(o+24, ip, 16);   // dest = ip
+       {
+               memcpy(p_ip6_hdr->ip6_dst.s6_addr, ip, 16);     // dest = ip
+       }
        else
        {
                // FF02::1 - all hosts
        else
        {
                // FF02::1 - all hosts
-               *(o+24) = 0xFF;
-               *(o+25) = 2;
-               *(o+39) = 1;
+               inet_pton(AF_INET6, "FF02::1", &p_ip6_hdr->ip6_dst.s6_addr);
        }
        }
-       *(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);
+
+       // RA message after Ipv6 header
+       p_nra = (struct nd_router_advert *) &p_ip6_hdr[1];
+       p_nra->nd_ra_type = ND_ROUTER_ADVERT; // RA message (134)
+       p_nra->nd_ra_code = 0;          // Code
+       p_nra->nd_ra_cksum = 0;         // Checksum
+       p_nra->nd_ra_curhoplimit = 64;          // Hop count
+       p_nra->nd_ra_flags_reserved = (ND_RA_FLAG_MANAGED|ND_RA_FLAG_OTHER); // Flags
+       p_nra->nd_ra_router_lifetime = 0xFFFF;  // Lifetime
+       p_nra->nd_ra_reachable = 0;     // Reachable time
+       p_nra->nd_ra_retransmit = 0;    // Retrans timer
+       // Option PI after RA message (rfc4861)
+       pinfo = (struct nd_opt_prefix_info *) &p_nra[1];
        pinfo->nd_opt_pi_type           = ND_OPT_PREFIX_INFORMATION;
        pinfo->nd_opt_pi_len            = 4;
        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_flags_reserved = ND_OPT_PI_FLAG_ONLINK | 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_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;
+       pinfo->nd_opt_pi_prefix_len     = 64; // prefix length
+       if (session[s].ipv6address.s6_addr[0])
+       {
+               // MSB 64bits of assigned IPv6 address to user (see radius attribut Framed-IPv6-Address)
+               memcpy(&pinfo->nd_opt_pi_prefix, &session[s].ipv6address.s6_addr[0], 8);
+       }
+       else
+               pinfo->nd_opt_pi_prefix     = config->ipv6_prefix;
 
 
-       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;
+       // // Length of payload (not header)
+       p_ip6_hdr->ip6_plen = htons(sizeof(*pinfo) + sizeof(*p_nra));
 
 
-       memcpy(c + sizeof(*phdr), o + 40, l - 40);
+       l = sizeof(*pinfo) + sizeof(*p_nra) + sizeof(*p_ip6_hdr);
 
 
+       /* Use pseudo hearder for checksum calculation */
+       memset(&pseudo_hdr, 0, sizeof(pseudo_hdr));
+       memcpy(&pseudo_hdr.src, &p_ip6_hdr->ip6_src, 16);
+       memcpy(&pseudo_hdr.dest, &p_ip6_hdr->ip6_dst, 16);
+       pseudo_hdr.ulp_length = htonl(sizeof(*pinfo) + sizeof(*p_nra)); // Lenght whitout Ipv6 header
+       pseudo_hdr.nexthdr = IPPROTO_ICMPV6;
        // Checksum is over the icmp6 payload plus the pseudo header
        // Checksum is over the icmp6 payload plus the pseudo header
-       *(uint16_t *)(o+42) = _checksum(c, l - 40 + sizeof(*phdr));
+       p_nra->nd_ra_cksum = ipv6_checksum(&pseudo_hdr, (uint8_t *) p_nra, (sizeof(*pinfo) + sizeof(*p_nra)));
 
 
-       tunnelsend(b, l + (o-b), t); // send it...
+       tunnelsend(b, l + (((uint8_t *) p_ip6_hdr)-b), t); // send it...
        return;
 }
        return;
 }
for cloning use: "git clone git://git.sameswireless.fr/l2tpns.git" ; For add to your sources.list: "deb http://package.sameswifi.fr/ jessie main"