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freebsd/sys/netinet/raw_ip.c
Garrett Wollman a29f300e80 The long-awaited mega-massive-network-code- cleanup. Part I. 
This commit includes the following changes:
1) Old-style (pr_usrreq()) protocols are no longer supported, the compatibility
glue for them is deleted, and the kernel will panic on boot if any are compiled
in.

2) Certain protocol entry points are modified to take a process structure,
so they they can easily tell whether or not it is possible to sleep, and
also to access credentials.

3) SS_PRIV is no more, and with it goes the SO_PRIVSTATE setsockopt()
call.  Protocols should use the process pointer they are now passed.

4) The PF_LOCAL and PF_ROUTE families have been updated to use the new
style, as has the `raw' skeleton family.

5) PF_LOCAL sockets now obey the process's umask when creating a socket
in the filesystem.

As a result, LINT is now broken.  I'm hoping that some enterprising hacker
with a bit more time will either make the broken bits work (should be
easy for netipx) or dike them out.
1997-04-27 20:01:29 +00:00

516 lines
13 KiB
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 1.44 1997/04/03 05:14:43 davidg 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)) {
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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