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|
/* $OpenBSD: ip6_divert.c,v 1.5 2010/07/03 04:44:51 guenther Exp $ */
/*
* Copyright (c) 2009 Michele Marchetto <michele@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/proc.h>
#include <sys/sysctl.h>
#include <net/if.h>
#include <net/route.h>
#include <net/netisr.h>
#include <net/pfvar.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/in_pcb.h>
#include <netinet/ip6.h>
#include <netinet6/in6_var.h>
#include <netinet6/in6_var.h>
#include <netinet6/ip6_divert.h>
struct inpcbtable divb6table;
struct div6stat div6stat;
#ifndef DIVERT_SENDSPACE
#define DIVERT_SENDSPACE (65536 + 100)
#endif
u_int divert6_sendspace = DIVERT_SENDSPACE;
#ifndef DIVERT_RECVSPACE
#define DIVERT_RECVSPACE (65536 + 100)
#endif
u_int divert6_recvspace = DIVERT_RECVSPACE;
#ifndef DIVERTHASHSIZE
#define DIVERTHASHSIZE 128
#endif
int *divert6ctl_vars[DIVERT6CTL_MAXID] = DIVERT6CTL_VARS;
int divb6hashsize = DIVERTHASHSIZE;
static struct sockaddr_in6 ip6addr = { sizeof(ip6addr), AF_INET6 };
void divert6_detach(struct inpcb *);
void
divert6_init()
{
in_pcbinit(&divb6table, divb6hashsize);
}
int
divert6_input(struct mbuf **mp, int *offp, int proto)
{
m_freem(*mp);
return (0);
}
int
divert6_output(struct mbuf *m, ...)
{
struct inpcb *inp;
struct ifqueue *inq;
struct mbuf *nam, *control;
struct sockaddr_in6 *sin6;
struct socket *so;
struct ifaddr *ifa;
int s, error = 0;
va_list ap;
va_start(ap, m);
inp = va_arg(ap, struct inpcb *);
nam = va_arg(ap, struct mbuf *);
control = va_arg(ap, struct mbuf *);
va_end(ap);
m->m_pkthdr.rcvif = NULL;
m->m_nextpkt = NULL;
m->m_pkthdr.rdomain = inp->inp_rtableid;
if (control)
m_freem(control);
sin6 = mtod(nam, struct sockaddr_in6 *);
so = inp->inp_socket;
m->m_pkthdr.pf.flags |= PF_TAG_DIVERTED_PACKET;
if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
ip6addr.sin6_addr = sin6->sin6_addr;
ifa = ifa_ifwithaddr(sin6tosa(&ip6addr), m->m_pkthdr.rdomain);
if (ifa == NULL) {
div6stat.divs_errors++;
m_freem(m);
return (EADDRNOTAVAIL);
}
m->m_pkthdr.rcvif = ifa->ifa_ifp;
inq = &ip6intrq;
s = splnet();
IF_INPUT_ENQUEUE(inq, m);
schednetisr(NETISR_IPV6);
splx(s);
} else {
error = ip6_output(m, NULL, &inp->inp_route6,
((so->so_options & SO_DONTROUTE) ? IP_ROUTETOIF : 0)
| IP_ALLOWBROADCAST | IP_RAWOUTPUT, NULL, NULL, NULL);
}
div6stat.divs_opackets++;
return (error);
}
void
divert6_packet(struct mbuf *m, int dir)
{
struct inpcb *inp;
struct socket *sa = NULL;
struct sockaddr_in6 addr;
struct pf_divert *pd;
div6stat.divs_ipackets++;
if (m->m_len < sizeof(struct ip6_hdr) &&
(m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
div6stat.divs_errors++;
return;
}
pd = pf_find_divert(m);
if (pd == NULL) {
div6stat.divs_errors++;
m_freem(m);
return;
}
bzero(&addr, sizeof(addr));
addr.sin6_family = AF_INET6;
addr.sin6_len = sizeof(addr);
if (dir == PF_IN) {
struct ifaddr *ifa;
struct ifnet *ifp;
ifp = m->m_pkthdr.rcvif;
TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
addr.sin6_addr = ((struct sockaddr_in6 *)
ifa->ifa_addr)->sin6_addr;
break;
}
}
CIRCLEQ_FOREACH(inp, &divb6table.inpt_queue, inp_queue) {
if (inp->inp_lport != pd->port)
continue;
sa = inp->inp_socket;
if (sbappendaddr(&sa->so_rcv, (struct sockaddr *)&addr,
m, NULL) == 0) {
div6stat.divs_fullsock++;
m_freem(m);
return;
} else
sorwakeup(inp->inp_socket);
break;
}
if (sa == NULL) {
div6stat.divs_noport++;
m_freem(m);
}
}
/*ARGSUSED*/
int
divert6_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *addr,
struct mbuf *control, struct proc *p)
{
struct inpcb *inp = sotoinpcb(so);
int error = 0;
int s;
if (req == PRU_CONTROL) {
return (in6_control(so, (u_long)m, (caddr_t)addr,
(struct ifnet *)control, p));
}
if (inp == NULL && req != PRU_ATTACH) {
error = EINVAL;
goto release;
}
switch (req) {
case PRU_ATTACH:
if (inp != NULL) {
error = EINVAL;
break;
}
if ((so->so_state & SS_PRIV) == 0) {
error = EACCES;
break;
}
s = splsoftnet();
error = in_pcballoc(so, &divb6table);
splx(s);
if (error)
break;
error = soreserve(so, divert6_sendspace, divert6_recvspace);
if (error)
break;
((struct inpcb *) so->so_pcb)->inp_flags |= INP_HDRINCL;
break;
case PRU_DETACH:
divert6_detach(inp);
break;
case PRU_BIND:
s = splsoftnet();
error = in6_pcbbind(inp, addr, p);
splx(s);
break;
case PRU_SHUTDOWN:
socantsendmore(so);
break;
case PRU_SEND:
return (divert6_output(m, inp, addr, control));
case PRU_ABORT:
soisdisconnected(so);
divert6_detach(inp);
break;
case PRU_SOCKADDR:
in6_setsockaddr(inp, addr);
break;
case PRU_PEERADDR:
in6_setpeeraddr(inp, addr);
break;
case PRU_SENSE:
return (0);
case PRU_LISTEN:
case PRU_CONNECT:
case PRU_CONNECT2:
case PRU_ACCEPT:
case PRU_DISCONNECT:
case PRU_SENDOOB:
case PRU_FASTTIMO:
case PRU_SLOWTIMO:
case PRU_PROTORCV:
case PRU_PROTOSEND:
error = EOPNOTSUPP;
break;
case PRU_RCVD:
case PRU_RCVOOB:
return (EOPNOTSUPP); /* do not free mbuf's */
default:
panic("divert6_usrreq");
}
release:
if (control) {
m_freem(control);
}
if (m)
m_freem(m);
return (error);
}
void
divert6_detach(struct inpcb *inp)
{
int s = splsoftnet();
in_pcbdetach(inp);
splx(s);
}
/*
* Sysctl for divert variables.
*/
int
divert6_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp,
void *newp, size_t newlen)
{
/* All sysctl names at this level are terminal. */
if (namelen != 1)
return (ENOTDIR);
switch (name[0]) {
case DIVERT6CTL_SENDSPACE:
return (sysctl_int(oldp, oldlenp, newp, newlen,
&divert6_sendspace));
case DIVERT6CTL_RECVSPACE:
return (sysctl_int(oldp, oldlenp, newp, newlen,
&divert6_recvspace));
case DIVERT6CTL_STATS:
if (newp != NULL)
return (EPERM);
return (sysctl_struct(oldp, oldlenp, newp, newlen,
&div6stat, sizeof(div6stat)));
default:
if (name[0] < DIVERT6CTL_MAXID)
return sysctl_int_arr(divert6ctl_vars, name, namelen,
oldp, oldlenp, newp, newlen);
return (ENOPROTOOPT);
}
/* NOTREACHED */
}
|