raw routing

[unix-history] / usr / src / sys / netinet / raw_ip.c

/*      raw_ip.c        4.19    83/06/30        */

#include "../h/param.h"
#include "../h/mbuf.h"
#include "../h/socket.h"
#include "../h/protosw.h"
#include "../h/socketvar.h"
#include "../h/errno.h"

#include "../net/if.h"
#include "../net/route.h"
#include "../net/raw_cb.h"

#include "../netinet/in.h"
#include "../netinet/in_systm.h"
#include "../netinet/ip.h"
#include "../netinet/ip_var.h"

/*
* Raw interface to IP protocol.
*/

struct  sockaddr_in ripdst = { AF_INET };
struct  sockaddr_in ripsrc = { AF_INET };
struct  sockproto ripproto = { PF_INET };
/*
* Setup generic address and protocol structures
* for raw_input routine, then pass them along with
* mbuf chain.
*/
rip_input(m)
       struct mbuf *m;
{
       register struct ip *ip = mtod(m, struct ip *);

       ripproto.sp_protocol = ip->ip_p;
       ripdst.sin_addr = ip->ip_dst;
       ripsrc.sin_addr = ip->ip_src;
       raw_input(m, &ripproto, (struct sockaddr *)&ripsrc,
         (struct sockaddr *)&ripdst);
}

/*
* Generate IP header and pass packet to ip_output.
* Tack on options user may have setup with control call.
*/
rip_output(m0, so)
       struct mbuf *m0;
       struct socket *so;
{
       register struct mbuf *m;
       register struct ip *ip;
       int len = 0, error;
       struct rawcb *rp = sotorawcb(so);
       struct sockaddr_in *sin;

       /*
        * Calculate data length and get an mbuf
        * for IP header.
        */
       for (m = m0; m; m = m->m_next)
               len += m->m_len;
       m = m_get(M_DONTWAIT, MT_HEADER);
       if (m == 0) {
               error = ENOBUFS;
               goto bad;
       }
       
       /*
        * Fill in IP header as needed.
        */
       m->m_off = MMAXOFF - sizeof(struct ip);
       m->m_len = sizeof(struct ip);
       m->m_next = m0;
       ip = mtod(m, struct ip *);
       ip->ip_p = so->so_proto->pr_protocol;
       ip->ip_len = sizeof(struct ip) + len;
       if (rp->rcb_flags & RAW_LADDR) {
               sin = (struct sockaddr_in *)&rp->rcb_laddr;
               if (sin->sin_family != AF_INET) {
                       error = EAFNOSUPPORT;
                       goto bad;
               }
               ip->ip_src.s_addr = sin->sin_addr.s_addr;
       } else
               ip->ip_src.s_addr = 0;
       ip->ip_dst = ((struct sockaddr_in *)&rp->rcb_faddr)->sin_addr;
       ip->ip_ttl = MAXTTL;
       return (ip_output(m, (struct mbuf *)0, &rp->rcb_route, 
          IP_ROUTETOIF|IP_ALLOWBROADCAST));
bad:
       m_freem(m);
       return (error);
}