Add of the RDNSS option to ICMPv6 Router Advertisement (RA).

diff --git a/debian/changelog b/debian/changelog
index e3b5193..565c153 100644 (file)
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+l2tpns (2.2.1-2fdn3.17) unstable; urgency=low
+
+  * Add of the RDNSS option to ICMPv6 Router Advertisement (RA).
+
+ -- Fernando Alves <fendo@sameswifi.fr>  Thu, 02 Oct 2014 00:24:31 +0200
+
 l2tpns (2.2.1-2fdn3.16) unstable; urgency=low
 
   * Fix: IPv6 prefix routing on slave cluster

diff --git a/icmp.c b/icmp.c
index d2f53e0..58c28f2 100644 (file)
--- a/icmp.c
+++ b/icmp.c
@@ -87,11 +87,21 @@ static uint16_t _checksum(uint8_t *addr, int count)
        return htons((uint16_t) sum);
 }
 
+struct nd_opt_rdnss_info_l2tpns
+{
+       uint8_t  nd_opt_rdnssi_type;
+       uint8_t  nd_opt_rdnssi_len;
+       uint16_t nd_opt_rdnssi_pref_flag_reserved;
+       uint32_t nd_opt_rdnssi_lifetime;
+       struct in6_addr nd_opt_rdnssi[0];
+};
+
 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;
+       struct nd_opt_rdnss_info_l2tpns *p_rdnss;
        uint8_t b[MAXETHER + 20];
        struct ipv6_pseudo_hdr pseudo_hdr;
        int l;
@@ -151,19 +161,44 @@ void send_ipv6_ra(sessionidt s, tunnelidt t, struct in6_addr *ip)
        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));
+       // Length of payload (not header)
+       l = sizeof(*pinfo) + sizeof(*p_nra);
+
+       if (config->default_ipv6_dns1.s6_addr32[0])
+       {
+               struct in6_addr *ptr_in6_addr;
+               p_rdnss = (struct nd_opt_rdnss_info_l2tpns *) &pinfo[1];
+
+               p_rdnss->nd_opt_rdnssi_type = 25; //RDNSS OPTION INFORMATION;
+               p_rdnss->nd_opt_rdnssi_len = 3; // 1 + 2 * nb DNS
+               p_rdnss->nd_opt_rdnssi_lifetime = htonl(config->dns6_lifetime);
+               ptr_in6_addr = &p_rdnss->nd_opt_rdnssi[0];
+               memcpy(ptr_in6_addr, &config->default_ipv6_dns1, sizeof(*ptr_in6_addr));
+
+               l += sizeof(*p_rdnss)  + sizeof(*ptr_in6_addr);
+               if (config->default_ipv6_dns2.s6_addr32[0])
+               {
+                       ptr_in6_addr = &p_rdnss->nd_opt_rdnssi[1];
+                       memcpy(ptr_in6_addr, &config->default_ipv6_dns2, sizeof(*ptr_in6_addr));
+                       p_rdnss->nd_opt_rdnssi_len += 2; // 1 + 2 * nb DNS
+                       l += sizeof(*ptr_in6_addr);
+               }
+       }
 
-       l = sizeof(*pinfo) + sizeof(*p_nra) + sizeof(*p_ip6_hdr);
+       // Length of payload (not header)
+       p_ip6_hdr->ip6_plen = htons(l);
 
        /* 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.ulp_length = htonl(l); // 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)));
+       p_nra->nd_ra_cksum = ipv6_checksum(&pseudo_hdr, (uint8_t *) p_nra, l);
+
+       // Length + hearder length
+       l += sizeof(*p_ip6_hdr);
 
        tunnelsend(b, l + (((uint8_t *) p_ip6_hdr)-b), t); // send it...
        return;

diff --git a/l2tpns.c b/l2tpns.c
index 14892f7..114981f 100644 (file)
--- a/l2tpns.c
+++ b/l2tpns.c
@@ -194,6 +194,7 @@ config_descriptt config_values[] = {
        CONFIG("dhcp6_preferred_lifetime", dhcp6_preferred_lifetime, INT),
        CONFIG("dhcp6_valid_lifetime", dhcp6_valid_lifetime, INT),
        CONFIG("dhcp6_server_duid", dhcp6_server_duid, INT),
+       CONFIG("dns6_lifetime", dns6_lifetime, INT),
        CONFIG("primary_ipv6_dns", default_ipv6_dns1, IPv6),
        CONFIG("secondary_ipv6_dns", default_ipv6_dns2, IPv6),
        CONFIG("default_ipv6_domain_list", default_ipv6_domain_list, STRING),
@@ -4599,6 +4600,8 @@ static void initdata(int optdebug, char *optconfig)
        // Set default value echo_timeout and idle_echo_timeout
        config->echo_timeout = ECHO_TIMEOUT;
        config->idle_echo_timeout = IDLE_ECHO_TIMEOUT;
+       // Set default RDNSS lifetime
+       config->dns6_lifetime = 1200;
 
        log_stream = stderr;
 

diff --git a/l2tpns.h b/l2tpns.h
index fdfaa62..c4487ff 100644 (file)
--- a/l2tpns.h
+++ b/l2tpns.h
@@ -808,6 +808,7 @@ typedef struct
        uint32_t dhcp6_preferred_lifetime;              // preferred lifetime (see rfc3315)
        uint32_t dhcp6_valid_lifetime;          // valid lifetime (see rfc3315)
        uint32_t dhcp6_server_duid;             // DUID of dhcpv6 server (see rfc3315)
+       uint32_t dns6_lifetime;         // RDNSS lifetime default 1200 (see rfc6106, rfc4861) (MaxRtrAdvInterval <= Lifetime <= 2*MaxRtrAdvInterval)
        char default_ipv6_domain_list[255];
 } configt;