SCTP is in the Tree :-)

[Bjoern A. Zeeb]

On Wed, 8 Nov 2006, Randall Stewart wrote:

> Ivan Voras wrote:
>> Randall Stewart wrote:
>> 
>> 
>>> Stream Control Transmission Protocol (SCTP) - is a reliable message
>>> oriented transport protocol which provides network fault tolerance
>>> It supports multiple streams and multihoming. A very good overview
>>> of the protocol is given in RFC 3268.
>> 
>> 
>> Looks cool :)
>> 
>> It's under IP so it's routable, but I imagine it probably needs routers
>> along the way to know about it in order to use the more advanced features?
>
> Nope.. not at all..
>
> The only issue is when you cross a firewall or NAT :-(
>
> Note that I have heard that the latest FreeBSD IPv6 FW for
> some reason drops SCTP packets even if you have typed in
> allow ip from any to any...
>
> Something about not liking protocol 132 in the extension
> headers :(

would that patch help you (I'd have to investigate in detail but like
some of us I am currently in Milan and I still don't know the details
of SCTP [as in I haven't read the RFC yet]):

Index: ip_fw2.c
===================================================================
RCS file: /local/mirror/FreeBSD/r/ncvs/src/sys/netinet/ip_fw2.c,v
retrieving revision 1.153
diff -u -p -r1.153 ip_fw2.c
--- ip_fw2.c    6 Nov 2006 13:42:04 -0000       1.153
+++ ip_fw2.c    9 Nov 2006 17:32:22 -0000
@@ -311,6 +311,7 @@ static int fw_deny_unknown_exthdrs = 1;
   */
  #define        L3HDR(T, ip)    ((T *)((u_int32_t *)(ip) + (ip)->ip_hl))
  #define        TCP(p)          ((struct tcphdr *)(p))
+#define        SCTP(p)         ((struct sctphdr *)(p))
  #define        UDP(p)          ((struct udphdr *)(p))
  #define        ICMP(p)         ((struct icmphdr *)(p))
  #define        ICMP6(p)        ((struct icmp6_hdr *)(p))
@@ -2222,6 +2223,12 @@ do {                                                                     \
                                 args->f_id.flags = TCP(ulp)->th_flags;
                                 break;

+                       case IPPROTO_SCTP:
+                               PULLUP_TO(hlen, ulp, struct sctphdr);
+                               src_port = SCTP(ulp)->src_port;
+                               dst_port = SCTP(ulp)->dest_port;
+                               break;
+
                         case IPPROTO_UDP:
                                 PULLUP_TO(hlen, ulp, struct udphdr);
                                 dst_port = UDP(ulp)->uh_dport;


-- 
Bjoern A. Zeeb				bzeeb at Zabbadoz dot NeT