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freebsd/sys/netinet/raw_ip.c

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/*
* Copyright (c) 1982, 1986, 1988, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)raw_ip.c 8.7 (Berkeley) 5/15/95
* $Id: raw_ip.c,v 1.45 1997/04/27 20:01:10 wollman Exp $
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/errno.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/proc.h>
#include <sys/protosw.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>
#include <net/if.h>
#include <net/route.h>
#define _IP_VHL
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/in_pcb.h>
#include <netinet/in_var.h>
#include <netinet/ip_var.h>
#include <netinet/ip_mroute.h>
#include <netinet/ip_fw.h>
#if !defined(COMPAT_IPFW) || COMPAT_IPFW == 1
#undef COMPAT_IPFW
#define COMPAT_IPFW 1
#else
#undef COMPAT_IPFW
#endif
static struct inpcbhead ripcb;
static struct inpcbinfo ripcbinfo;
/*
* Nominal space allocated to a raw ip socket.
*/
#define RIPSNDQ 8192
#define RIPRCVQ 8192
/*
* Raw interface to IP protocol.
*/
/*
* Initialize raw connection block q.
*/
void
rip_init()
{
LIST_INIT(&ripcb);
ripcbinfo.listhead = &ripcb;
/*
* XXX We don't use the hash list for raw IP, but it's easier
* to allocate a one entry hash list than it is to check all
* over the place for hashbase == NULL.
*/
ripcbinfo.hashbase = hashinit(1, M_PCB, &ripcbinfo.hashmask);
}
static struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET };
/*
* Setup generic address and protocol structures
* for raw_input routine, then pass them along with
* mbuf chain.
*/
void
rip_input(m, iphlen)
struct mbuf *m;
int iphlen;
{
register struct ip *ip = mtod(m, struct ip *);
register struct inpcb *inp;
struct inpcb *last = 0;
struct mbuf *opts = 0;
ripsrc.sin_addr = ip->ip_src;
for (inp = ripcb.lh_first; inp != NULL; inp = inp->inp_list.le_next) {
if (inp->inp_ip_p && inp->inp_ip_p != ip->ip_p)
continue;
if (inp->inp_laddr.s_addr &&
inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
continue;
if (inp->inp_faddr.s_addr &&
inp->inp_faddr.s_addr != ip->ip_src.s_addr)
continue;
if (last) {
struct mbuf *n = m_copy(m, 0, (int)M_COPYALL);
if (n) {
if (last->inp_flags & INP_CONTROLOPTS ||
last->inp_socket->so_options & SO_TIMESTAMP)
ip_savecontrol(last, &opts, ip, n);
if (sbappendaddr(&last->inp_socket->so_rcv,
(struct sockaddr *)&ripsrc, n,
opts) == 0) {
/* should notify about lost packet */
m_freem(n);
if (opts)
m_freem(opts);
} else
sorwakeup(last->inp_socket);
opts = 0;
}
}
last = inp;
}
if (last) {
if (last->inp_flags & INP_CONTROLOPTS ||
last->inp_socket->so_options & SO_TIMESTAMP)
ip_savecontrol(last, &opts, ip, m);
if (sbappendaddr(&last->inp_socket->so_rcv,
(struct sockaddr *)&ripsrc, m, opts) == 0) {
m_freem(m);
if (opts)
m_freem(opts);
} else
sorwakeup(last->inp_socket);
} else {
m_freem(m);
ipstat.ips_noproto++;
ipstat.ips_delivered--;
}
}
/*
* Generate IP header and pass packet to ip_output.
* Tack on options user may have setup with control call.
*/
int
rip_output(m, so, dst)
register struct mbuf *m;
struct socket *so;
u_long dst;
{
register struct ip *ip;
register struct inpcb *inp = sotoinpcb(so);
int flags = (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST;
/*
* If the user handed us a complete IP packet, use it.
* Otherwise, allocate an mbuf for a header and fill it in.
*/
if ((inp->inp_flags & INP_HDRINCL) == 0) {
if (m->m_pkthdr.len + sizeof(struct ip) > IP_MAXPACKET) {
m_freem(m);
return(EMSGSIZE);
}
M_PREPEND(m, sizeof(struct ip), M_WAIT);
ip = mtod(m, struct ip *);
ip->ip_tos = 0;
ip->ip_off = 0;
ip->ip_p = inp->inp_ip_p;
ip->ip_len = m->m_pkthdr.len;
ip->ip_src = inp->inp_laddr;
ip->ip_dst.s_addr = dst;
ip->ip_ttl = MAXTTL;
} else {
if (m->m_pkthdr.len > IP_MAXPACKET) {
m_freem(m);
return(EMSGSIZE);
}
ip = mtod(m, struct ip *);
/* don't allow both user specified and setsockopt options,
and don't allow packet length sizes that will crash */
if (((IP_VHL_HL(ip->ip_vhl) != (sizeof (*ip) >> 2))
&& inp->inp_options)
|| (ip->ip_len > m->m_pkthdr.len)
|| (ip->ip_len < (IP_VHL_HL(ip->ip_vhl) << 2))) {
m_freem(m);
return EINVAL;
}
if (ip->ip_id == 0)
ip->ip_id = htons(ip_id++);
/* XXX prevent ip_output from overwriting header fields */
flags |= IP_RAWOUTPUT;
ipstat.ips_rawout++;
}
return (ip_output(m, inp->inp_options, &inp->inp_route, flags,
inp->inp_moptions));
}
/*
* Raw IP socket option processing.
*/
int
rip_ctloutput(op, so, level, optname, m, p)
int op;
struct socket *so;
int level, optname;
struct mbuf **m;
struct proc *p;
{
register struct inpcb *inp = sotoinpcb(so);
register int error;
if (level != IPPROTO_IP) {
if (op == PRCO_SETOPT && *m)
(void)m_free(*m);
return (EINVAL);
}
switch (optname) {
case IP_HDRINCL:
error = 0;
if (op == PRCO_SETOPT) {
if (m == 0 || *m == 0 || (*m)->m_len < sizeof (int))
error = EINVAL;
else if (*mtod(*m, int *))
inp->inp_flags |= INP_HDRINCL;
else
inp->inp_flags &= ~INP_HDRINCL;
if (*m)
(void)m_free(*m);
} else {
*m = m_get(M_WAIT, MT_SOOPTS);
(*m)->m_len = sizeof (int);
*mtod(*m, int *) = inp->inp_flags & INP_HDRINCL;
}
return (error);
#ifdef COMPAT_IPFW
case IP_FW_GET:
if (ip_fw_ctl_ptr == NULL || op == PRCO_SETOPT) {
if (*m) (void)m_free(*m);
return(EINVAL);
}
return (*ip_fw_ctl_ptr)(optname, m);
case IP_FW_ADD:
case IP_FW_DEL:
case IP_FW_FLUSH:
case IP_FW_ZERO:
if (ip_fw_ctl_ptr == NULL || op != PRCO_SETOPT) {
if (*m) (void)m_free(*m);
return(EINVAL);
}
return (*ip_fw_ctl_ptr)(optname, m);
case IP_NAT:
if (ip_nat_ctl_ptr == NULL) {
if (*m) (void)m_free(*m);
return(EINVAL);
}
return (*ip_nat_ctl_ptr)(op, m);
#endif
case IP_RSVP_ON:
return ip_rsvp_init(so);
break;
case IP_RSVP_OFF:
return ip_rsvp_done();
break;
case IP_RSVP_VIF_ON:
return ip_rsvp_vif_init(so, *m);
case IP_RSVP_VIF_OFF:
return ip_rsvp_vif_done(so, *m);
case MRT_INIT:
case MRT_DONE:
case MRT_ADD_VIF:
case MRT_DEL_VIF:
case MRT_ADD_MFC:
case MRT_DEL_MFC:
case MRT_VERSION:
case MRT_ASSERT:
if (op == PRCO_SETOPT) {
error = ip_mrouter_set(optname, so, *m);
if (*m)
(void)m_free(*m);
} else if (op == PRCO_GETOPT) {
error = ip_mrouter_get(optname, so, m);
} else
error = EINVAL;
return (error);
}
return (ip_ctloutput(op, so, level, optname, m, p));
}
/*
* This function exists solely to receive the PRC_IFDOWN messages which
* are sent by if_down(). It looks for an ifaddr whose ifa_addr is sa,
* and calls in_ifadown() to remove all routes corresponding to that address.
* It also receives the PRC_IFUP messages from if_up() and reinstalls the
* interface routes.
*/
void
rip_ctlinput(cmd, sa, vip)
int cmd;
struct sockaddr *sa;
void *vip;
{
struct in_ifaddr *ia;
struct ifnet *ifp;
int err;
int flags;
switch(cmd) {
case PRC_IFDOWN:
for (ia = in_ifaddrhead.tqh_first; ia;
ia = ia->ia_link.tqe_next) {
if (ia->ia_ifa.ifa_addr == sa
&& (ia->ia_flags & IFA_ROUTE)) {
/*
* in_ifscrub kills the interface route.
*/
in_ifscrub(ia->ia_ifp, ia);
/*
* in_ifadown gets rid of all the rest of
* the routes. This is not quite the right
* thing to do, but at least if we are running
* a routing process they will come back.
*/
in_ifadown(&ia->ia_ifa);
break;
}
}
break;
case PRC_IFUP:
for (ia = in_ifaddrhead.tqh_first; ia;
ia = ia->ia_link.tqe_next) {
if (ia->ia_ifa.ifa_addr == sa)
break;
}
if (ia == 0 || (ia->ia_flags & IFA_ROUTE))
return;
flags = RTF_UP;
ifp = ia->ia_ifa.ifa_ifp;
if ((ifp->if_flags & IFF_LOOPBACK)
|| (ifp->if_flags & IFF_POINTOPOINT))
flags |= RTF_HOST;
err = rtinit(&ia->ia_ifa, RTM_ADD, flags);
if (err == 0)
ia->ia_flags |= IFA_ROUTE;
break;
}
}
static u_long rip_sendspace = RIPSNDQ;
static u_long rip_recvspace = RIPRCVQ;
SYSCTL_INT(_net_inet_raw, OID_AUTO, maxdgram, CTLFLAG_RW, &rip_sendspace,
0, "");
SYSCTL_INT(_net_inet_raw, OID_AUTO, recvspace, CTLFLAG_RW, &rip_recvspace,
0, "");
static int
rip_attach(struct socket *so, int proto, struct proc *p)
{
struct inpcb *inp;
int error;
inp = sotoinpcb(so);
if (inp)
panic("rip_attach");
if (p && (error = suser(p->p_ucred, &p->p_acflag)) != 0)
return error;
if ((error = soreserve(so, rip_sendspace, rip_recvspace)) ||
(error = in_pcballoc(so, &ripcbinfo, p)))
return error;
inp = (struct inpcb *)so->so_pcb;
inp->inp_ip_p = proto;
return 0;
}
static int
rip_detach(struct socket *so)
{
struct inpcb *inp;
inp = sotoinpcb(so);
if (inp == 0)
panic("rip_detach");
if (so == ip_mrouter)
ip_mrouter_done();
ip_rsvp_force_done(so);
if (so == ip_rsvpd)
ip_rsvp_done();
in_pcbdetach(inp);
return 0;
}
static int
rip_abort(struct socket *so)
{
soisdisconnected(so);
return rip_detach(so);
}
static int
rip_disconnect(struct socket *so)
{
if ((so->so_state & SS_ISCONNECTED) == 0)
return ENOTCONN;
return rip_abort(so);
}
static int
rip_bind(struct socket *so, struct mbuf *nam, struct proc *p)
{
struct inpcb *inp = sotoinpcb(so);
struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
if (nam->m_len != sizeof(*addr))
return EINVAL;
if (TAILQ_EMPTY(&ifnet) || ((addr->sin_family != AF_INET) &&
(addr->sin_family != AF_IMPLINK)) ||
(addr->sin_addr.s_addr &&
ifa_ifwithaddr((struct sockaddr *)addr) == 0))
return EADDRNOTAVAIL;
inp->inp_laddr = addr->sin_addr;
return 0;
}
static int
rip_connect(struct socket *so, struct mbuf *nam, struct proc *p)
{
struct inpcb *inp = sotoinpcb(so);
struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
if (nam->m_len != sizeof(*addr))
return EINVAL;
if (TAILQ_EMPTY(&ifnet))
return EADDRNOTAVAIL;
if ((addr->sin_family != AF_INET) &&
(addr->sin_family != AF_IMPLINK))
return EAFNOSUPPORT;
inp->inp_faddr = addr->sin_addr;
soisconnected(so);
return 0;
}
static int
rip_shutdown(struct socket *so)
{
socantsendmore(so);
return 0;
}
static int
rip_send(struct socket *so, int flags, struct mbuf *m, struct mbuf *nam,
struct mbuf *control, struct proc *p)
{
struct inpcb *inp = sotoinpcb(so);
register u_long dst;
if (so->so_state & SS_ISCONNECTED) {
if (nam) {
m_freem(m);
return EISCONN;
}
dst = inp->inp_faddr.s_addr;
} else {
if (nam == NULL) {
m_freem(m);
return ENOTCONN;
}
dst = mtod(nam, struct sockaddr_in *)->sin_addr.s_addr;
}
return rip_output(m, so, dst);
}
struct pr_usrreqs rip_usrreqs = {
rip_abort, pru_accept_notsupp, rip_attach, rip_bind, rip_connect,
pru_connect2_notsupp, in_control, rip_detach, rip_disconnect,
pru_listen_notsupp, in_setpeeraddr, pru_rcvd_notsupp,
pru_rcvoob_notsupp, rip_send, pru_sense_null, rip_shutdown,
in_setsockaddr, sosend, soreceive, soselect
};
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