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raw_ip.c
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C/C++ Source or Header
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1989-10-14
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4KB
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166 lines
/*
* Copyright (c) 1982, 1986 Regents of the University of California.
* All rights reserved. The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*
* @(#)raw_ip.c 1.11 89/01/16 SMI; from UCB 7.2 6/21/87
*/
#include <sys/param.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/protosw.h>
#include <sys/socketvar.h>
#include <sys/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(m, so)
register struct mbuf *m;
struct socket *so;
{
register struct ip *ip;
int error;
struct rawcb *rp = sotorawcb(so);
struct sockaddr_in *sin;
/*
* if the protocol is IPPROTO_RAW, the user handed us a
* complete IP packet. Otherwise, allocate an mbuf for a
* header and fill it in as needed.
*/
if (so->so_proto->pr_protocol != IPPROTO_RAW) {
/*
* Calculate data length and get an mbuf
* for IP header.
*/
int len = 0;
struct mbuf *m0;
for (m0 = m; m; m = m->m_next)
len += m->m_len;
m = m_get(M_DONTWAIT, MT_HEADER);
if (m == 0) {
m = m0;
error = ENOBUFS;
goto bad;
}
m->m_off = MMAXOFF - sizeof(struct ip);
m->m_len = sizeof(struct ip);
m->m_next = m0;
ip = mtod(m, struct ip *);
ip->ip_off = 0;
ip->ip_tos = 0;
ip->ip_p = rp->rcb_proto.sp_protocol;
ip->ip_len = sizeof(struct ip) + len;
ip->ip_ttl = MAXTTL;
} else
ip = mtod(m, struct ip *);
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;
return (ip_output(m, rp->rcb_options, &rp->rcb_route,
(so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST));
bad:
m_freem(m);
return (error);
}
/*
* Raw IP socket option processing.
*/
rip_ctloutput(op, so, level, optname, m)
int op;
struct socket *so;
int level, optname;
struct mbuf **m;
{
int error = 0;
register struct rawcb *rp = sotorawcb(so);
if (level != IPPROTO_IP)
error = EINVAL;
else switch (op) {
case PRCO_SETOPT:
switch (optname) {
case IP_OPTIONS:
return (ip_pcbopts(&rp->rcb_options, *m));
default:
error = EINVAL;
break;
}
break;
case PRCO_GETOPT:
switch (optname) {
case IP_OPTIONS:
*m = m_get(M_WAIT, MT_SOOPTS);
if (rp->rcb_options) {
(*m)->m_off = rp->rcb_options->m_off;
(*m)->m_len = rp->rcb_options->m_len;
bcopy(mtod(rp->rcb_options, caddr_t),
mtod(*m, caddr_t), (unsigned)(*m)->m_len);
} else
(*m)->m_len = 0;
break;
default:
error = EINVAL;
break;
}
break;
}
if (op == PRCO_SETOPT && *m)
(void)m_free(*m);
return (error);
}