Re: [Lksctp-developers] Problem with IPV6 SCTP

[Wei Y. <yj...@cn...>]

chandru.bs chandru rote:
> Hi,
>
> Below is the sample ipv6 server and client programs with SCTP socket
> type.  When i run these server and client, i do see following on
> tshark trace (server is running on fe80::21d:9ff:fe17:5d0e and client
> on fe80::213:d3ff:fee7:f511) and i could not able to communication on
> this socket. Please guide me though this.
>
> Also let me know in client program   is there a way to avoid
> setsockopt(sd, SOL_SOCKET, SO_BINDTODEVICE, "eth0\0", 5);
>   

This is IPv6 issue. If you want to used IPv6 link local address, your 
*MUST* special
the out device. Use IPv6 global address to aviod use 
setsockopt(SO_BINDTODEVICE).

Regards

>   3.953989 fe80::213:d3ff:fee7:f511 -> fe80::21d:9ff:fe17:5d0e SCTP INIT
>   3.954051 fe80::21d:9ff:fe17:5d0e -> fe80::213:d3ff:fee7:f511 ICMPv6
> Unreachable (Administratively prohibited)
>  15.953438 fe80::213:d3ff:fee7:f511 -> fe80::21d:9ff:fe17:5d0e SCTP INIT
>  15.953504 fe80::21d:9ff:fe17:5d0e -> fe80::213:d3ff:fee7:f511 ICMPv6
> Unreachable (Administratively prohibited)
>  39.975292 fe80::213:d3ff:fee7:f511 -> fe80::21d:9ff:fe17:5d0e SCTP INIT
>  ..
>
> Run server: ./serverexetuable
> Running Client: ./clientexecutable <server ipv6 address>
>
> Server Program:
> #include <stdio.h>
> #include <errno.h>
> #include <resolv.h>
> #include <sys/socket.h>
> #include <arpa/inet.h>
> #include <ctype.h>
> #include <stdarg.h>
> #include <sys/types.h>
> #include <sys/socket.h>
> #include <netinet/sctp.h>
>
>
> void panic(char* msg, ...)
> {       va_list ap;
>
>         va_start(ap, msg);
>         vprintf(msg, ap);
>         va_end(ap);
>         abort();
> }
>
> int main(int count, char *strings[])
> {
>     int sd, portnum, len;
>     struct sockaddr_in6 addr;
>     int idleTime = 20;
>
>     if ( count == 2 )
>         portnum = atoi(strings[1]);
>     else
>         portnum = 9990;
>     bzero(&addr, sizeof(addr));
>    if ( (sd = socket(AF_INET6, SOCK_STREAM, IPPROTO_SCTP)) < 0 )
>         panic("socket");
>
>     addr.sin6_family = AF_INET6;
>     addr.sin6_port = htons(portnum);
>     addr.sin6_scope_id = 2;
>
>     if ( inet_pton(AF_INET6, "0::0", &addr.sin6_addr) == 0 )
>                 panic("inet_pton");
>
>     struct linger      linger;
>     /* Set linger on, to 0 time */
>     linger.l_onoff = 1;
>     linger.l_linger = 0;
>
>     setsockopt(sd, SOL_SOCKET, SO_LINGER,
>                  (char *)&linger, sizeof(struct linger));
>
>     int    dummy = 1;
>
>     /* Set reuseaddr socket option */
>
>     setsockopt(sd, SOL_SOCKET, SO_REUSEADDR,
>                (void *)&dummy, sizeof(int));
>
>
>     //if ( bind(sd, (struct sockaddr*)&addr, sizeof(addr)) != 0 )
>
>     if ( sctp_bindx(sd, (struct sockaddr*)&addr, 1, SCTP_BINDX_ADD_ADDR) != 0 )
>                 panic("bind6");
>
>     if ( listen(sd, 15) != 0 )
>       panic("listen6");
>
>     while (1)
>     {
>         int sent, size=sizeof(addr);
>         int client;
>         char line[100];
>
>         client = accept(sd, (struct sockaddr*)&addr, &size);
>         fprintf(stderr, "Connected: %s port=%d\n",
>         inet_ntop(AF_INET6, &addr.sin6_addr, line, sizeof(line)),
> addr.sin6_port);
>
>         do
>         {
>             sent = send(client, line, recv(client, len, sizeof(line), 0), 0);
>             fprintf(stderr, "server=%s", line);
>         }
>         while ( sent > 0  &&  strcmp(line, "bye\n") != 0 );
>         close(client);
>     }
> }
>
>
> Client Program:
> #include <stdio.h>
> #include <errno.h>
> #include <resolv.h>
> #include <sys/socket.h>
> #include <arpa/inet.h>
> #include <ctype.h>
> #include <stdarg.h>
> #include <unistd.h>
> #include <netdb.h>
> #include <netinet/sctp.h>
> #include <sys/uio.h>
>
> void panic(char* msg, ...)
> {   va_list ap;
>
>     va_start(ap, msg);
>     vprintf(msg, ap);
>     va_end(ap);
>     abort();
> }
>
> int main(int count, char *strings[])
> {
>     int sd, portnum, ret, sz;
>     struct sockaddr_in6 addr;
>     char line[100];
>     struct in6_addr ipv6_local;
>     sctp_assoc_t id;
>
>     struct sctp_initmsg init;
>
>     if ( count == 3 )
>         portnum = atoi(strings[2]);
>     else
>         portnum = 9990;
>
>     bzero(&addr, sizeof(addr));
>
>     if ( (sd = socket(PF_INET6, SOCK_STREAM, IPPROTO_SCTP)) < 0 )
>                 panic("socket");
>
>     addr.sin6_family = AF_INET6;
>     addr.sin6_port = (int)htons(portnum);
>     addr.sin6_scope_id = 2;
>
>     if ( inet_pton(AF_INET6, strings[1], &addr.sin6_addr) == 0 )
>                 panic("inet_aton");
>
>     setsockopt(sd, SOL_SOCKET, SO_BINDTODEVICE, "eth0\0", 5);
>
>
>     if (connect(sd, (struct sockaddr*)&addr, sizeof(addr)) != 0)
>     {
>         perror("?\n");
>         panic("connect6");
>
>      }
>      do
>      {
>          fgets(line, sizeof(line), stdin);
>          send(sd, line, strlen(line)+1, 0);
>          recv(sd, line, sizeof(line), 0);
>          printf("client=%s", line);
>      }
>
>      while ( strcmp(line, "bye\n") != 0 );
>      close(sd);
> }
>
> Thanks,
> Chandru
>
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