Merge from Master

[l2tpns.git] / icmp.c

diff --git a/icmp.c b/icmp.c
index 0a50c39..d03b60b 100644 (file)
--- a/icmp.c
+++ b/icmp.c
@@ -1,30 +1,24 @@
 // L2TPNS: icmp
 
 // L2TPNS: icmp
 

-char const *cvs_id_icmp = "$Id: icmp.c,v 1.5 2004/11/16 07:54:32 bodea Exp $";
-

 #include <arpa/inet.h>
 #include <arpa/inet.h>

-#include <netdb.h>
-#include <netinet/in.h>
-#include <asm/types.h>

 #include <linux/ip.h>
 #include <linux/icmp.h>
 #include <linux/ip.h>
 #include <linux/icmp.h>

-#include <stdio.h>
-#include <sys/socket.h>
+#include <netinet/icmp6.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 __u16 _checksum(unsigned char *addr, int count);
+static uint16_t _checksum(uint8_t *addr, int count);

 
 

-void host_unreachable(ipt destination, u16 id, ipt source, char *packet, int packet_len)
+void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, uint8_t *packet, int packet_len)

 {
        char buf[128] = {0};
        struct iphdr *iph;
        struct icmphdr *icmp;
 {
        char buf[128] = {0};
        struct iphdr *iph;
        struct icmphdr *icmp;

-       char *data;

        int len = 0, on = 1, icmp_socket;
        struct sockaddr_in whereto = {0};
 
        int len = 0, on = 1, icmp_socket;
        struct sockaddr_in whereto = {0};
 


@@ -40,9 +34,13 @@ void host_unreachable(ipt destination, u16 id, ipt source, char *packet, int pac
        len = sizeof(struct iphdr);
        icmp = (struct icmphdr *)(buf + len);
        len += sizeof(struct icmphdr);
        len = sizeof(struct iphdr);
        icmp = (struct icmphdr *)(buf + len);
        len += sizeof(struct icmphdr);

-       data = (char *)(buf + len);
-       len += (packet_len < 64) ? packet_len : 64;
-       memcpy(data, packet, (packet_len < 64) ? packet_len : 64);
+
+       /* ip header + first 8 bytes of payload */
+       if (packet_len > (sizeof(struct iphdr) + 8))
+               packet_len = sizeof(struct iphdr) + 8;
+
+       memcpy(buf + len, packet, packet_len);
+       len += packet_len;

 
        iph->tos = 0;
        iph->id = id;
 
        iph->tos = 0;
        iph->id = id;


@@ -60,25 +58,25 @@ void host_unreachable(ipt destination, u16 id, ipt source, char *packet, int pac
 
        icmp->type = ICMP_DEST_UNREACH;
        icmp->code = ICMP_HOST_UNREACH;
 
        icmp->type = ICMP_DEST_UNREACH;
        icmp->code = ICMP_HOST_UNREACH;

-       icmp->checksum = _checksum((char *)icmp, sizeof(struct icmphdr) + ((packet_len < 64) ? packet_len : 64));
+       icmp->checksum = _checksum((uint8_t *) icmp, sizeof(struct icmphdr) + packet_len);

 
 

-       iph->check = _checksum((char *)iph, sizeof(struct iphdr));
+       iph->check = _checksum((uint8_t *) iph, sizeof(struct iphdr));

 
 

-       sendto(icmp_socket, (char *)buf, len, 0, (struct sockaddr *)&whereto, sizeof(struct sockaddr));
+       sendto(icmp_socket, buf, len, 0, (struct sockaddr *)&whereto, sizeof(struct sockaddr));

        close(icmp_socket);
 }
 
        close(icmp_socket);
 }
 

-static __u16 _checksum(unsigned char *addr, int count)
+static uint16_t _checksum(uint8_t *addr, int count)

 {
        register long sum = 0;
 
        for (; count > 1; count -= 2)
        {
 {
        register long sum = 0;
 
        for (; count > 1; count -= 2)
        {

-               sum += ntohs(*(u32 *)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)


@@ -87,5 +85,87 @@ static __u16 _checksum(unsigned char *addr, int count)
        // one's complement the result
        sum = ~sum;
 
        // one's complement the result
        sum = ~sum;
 

-       return htons((u16) sum);
+       return htons((uint16_t) sum);
+}
+
+void send_ipv6_ra(sessionidt s, tunnelidt t, struct in6_addr *ip)
+{
+       struct nd_opt_prefix_info *pinfo;
+       struct ip6_hdr *p_ip6_hdr;
+       struct nd_router_advert *p_nra;
+       uint8_t b[MAXETHER + 20];
+       struct ipv6_pseudo_hdr pseudo_hdr;
+       int l;
+
+       LOG(3, s, t, "Sending IPv6 RA\n");
+
+       memset(b, 0, sizeof(b));
+       p_ip6_hdr = (struct ip6_hdr *) makeppp(b, sizeof(b), 0, 0, s, t, PPPIPV6, 0, 0, 0);
+
+       if (!p_ip6_hdr)
+       {
+               LOG(3, s, t, "failed to send IPv6 RA\n");
+               return;
+       }
+
+       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)
+       {
+               memcpy(p_ip6_hdr->ip6_dst.s6_addr, ip, 16);     // dest = ip
+       }
+       else
+       {
+               // FF02::1 - all hosts
+               inet_pton(AF_INET6, "FF02::1", &p_ip6_hdr->ip6_dst.s6_addr);
+       }
+
+       // 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_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_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;
+
+       // // Length of payload (not header)
+       p_ip6_hdr->ip6_plen = htons(sizeof(*pinfo) + sizeof(*p_nra));
+
+       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
+       p_nra->nd_ra_cksum = ipv6_checksum(&pseudo_hdr, (uint8_t *) p_nra, (sizeof(*pinfo) + sizeof(*p_nra)));
+
+       tunnelsend(b, l + (((uint8_t *) p_ip6_hdr)-b), t); // send it...
+       return;

 }
 }