54d642bbe5
protocol entry points using functions named proto_getsockaddr and proto_getpeeraddr rather than proto_setsockaddr and proto_setpeeraddr. While it's true that sockaddrs are allocated and set, the net effect is to retrieve (get) the socket address or peer address from a socket, not set it, so align names to that intent.
721 lines
19 KiB
C
721 lines
19 KiB
C
/*-
|
|
* 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.
|
|
* 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#if !defined(KLD_MODULE)
|
|
#include "opt_inet.h"
|
|
#include "opt_ipfw.h"
|
|
#include "opt_mac.h"
|
|
#ifndef INET
|
|
#error "IPDIVERT requires INET."
|
|
#endif
|
|
#ifndef IPFIREWALL
|
|
#error "IPDIVERT requires IPFIREWALL"
|
|
#endif
|
|
#endif
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/module.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/priv.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/protosw.h>
|
|
#include <sys/signalvar.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/socketvar.h>
|
|
#include <sys/sx.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/systm.h>
|
|
|
|
#include <vm/uma.h>
|
|
|
|
#include <net/if.h>
|
|
#include <net/route.h>
|
|
|
|
#include <netinet/in.h>
|
|
#include <netinet/in_pcb.h>
|
|
#include <netinet/in_systm.h>
|
|
#include <netinet/in_var.h>
|
|
#include <netinet/ip.h>
|
|
#include <netinet/ip_divert.h>
|
|
#include <netinet/ip_var.h>
|
|
#include <netinet/ip_fw.h>
|
|
|
|
#include <security/mac/mac_framework.h>
|
|
|
|
/*
|
|
* Divert sockets
|
|
*/
|
|
|
|
/*
|
|
* Allocate enough space to hold a full IP packet
|
|
*/
|
|
#define DIVSNDQ (65536 + 100)
|
|
#define DIVRCVQ (65536 + 100)
|
|
|
|
/*
|
|
* Divert sockets work in conjunction with ipfw, see the divert(4)
|
|
* manpage for features.
|
|
* Internally, packets selected by ipfw in ip_input() or ip_output(),
|
|
* and never diverted before, are passed to the input queue of the
|
|
* divert socket with a given 'divert_port' number (as specified in
|
|
* the matching ipfw rule), and they are tagged with a 16 bit cookie
|
|
* (representing the rule number of the matching ipfw rule), which
|
|
* is passed to process reading from the socket.
|
|
*
|
|
* Packets written to the divert socket are again tagged with a cookie
|
|
* (usually the same as above) and a destination address.
|
|
* If the destination address is INADDR_ANY then the packet is
|
|
* treated as outgoing and sent to ip_output(), otherwise it is
|
|
* treated as incoming and sent to ip_input().
|
|
* In both cases, the packet is tagged with the cookie.
|
|
*
|
|
* On reinjection, processing in ip_input() and ip_output()
|
|
* will be exactly the same as for the original packet, except that
|
|
* ipfw processing will start at the rule number after the one
|
|
* written in the cookie (so, tagging a packet with a cookie of 0
|
|
* will cause it to be effectively considered as a standard packet).
|
|
*/
|
|
|
|
/* Internal variables. */
|
|
static struct inpcbhead divcb;
|
|
static struct inpcbinfo divcbinfo;
|
|
|
|
static u_long div_sendspace = DIVSNDQ; /* XXX sysctl ? */
|
|
static u_long div_recvspace = DIVRCVQ; /* XXX sysctl ? */
|
|
|
|
/*
|
|
* Initialize divert connection block queue.
|
|
*/
|
|
static void
|
|
div_zone_change(void *tag)
|
|
{
|
|
|
|
uma_zone_set_max(divcbinfo.ipi_zone, maxsockets);
|
|
}
|
|
|
|
static int
|
|
div_inpcb_init(void *mem, int size, int flags)
|
|
{
|
|
struct inpcb *inp = mem;
|
|
|
|
INP_LOCK_INIT(inp, "inp", "divinp");
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
div_inpcb_fini(void *mem, int size)
|
|
{
|
|
struct inpcb *inp = mem;
|
|
|
|
INP_LOCK_DESTROY(inp);
|
|
}
|
|
|
|
void
|
|
div_init(void)
|
|
{
|
|
|
|
INP_INFO_LOCK_INIT(&divcbinfo, "div");
|
|
LIST_INIT(&divcb);
|
|
divcbinfo.ipi_listhead = &divcb;
|
|
/*
|
|
* XXX We don't use the hash list for divert IP, but it's easier
|
|
* to allocate a one entry hash list than it is to check all
|
|
* over the place for hashbase == NULL.
|
|
*/
|
|
divcbinfo.ipi_hashbase = hashinit(1, M_PCB, &divcbinfo.ipi_hashmask);
|
|
divcbinfo.ipi_porthashbase = hashinit(1, M_PCB,
|
|
&divcbinfo.ipi_porthashmask);
|
|
divcbinfo.ipi_zone = uma_zcreate("divcb", sizeof(struct inpcb),
|
|
NULL, NULL, div_inpcb_init, div_inpcb_fini, UMA_ALIGN_PTR,
|
|
UMA_ZONE_NOFREE);
|
|
uma_zone_set_max(divcbinfo.ipi_zone, maxsockets);
|
|
EVENTHANDLER_REGISTER(maxsockets_change, div_zone_change,
|
|
NULL, EVENTHANDLER_PRI_ANY);
|
|
}
|
|
|
|
/*
|
|
* IPPROTO_DIVERT is not in the real IP protocol number space; this
|
|
* function should never be called. Just in case, drop any packets.
|
|
*/
|
|
void
|
|
div_input(struct mbuf *m, int off)
|
|
{
|
|
ipstat.ips_noproto++;
|
|
m_freem(m);
|
|
}
|
|
|
|
/*
|
|
* Divert a packet by passing it up to the divert socket at port 'port'.
|
|
*
|
|
* Setup generic address and protocol structures for div_input routine,
|
|
* then pass them along with mbuf chain.
|
|
*/
|
|
static void
|
|
divert_packet(struct mbuf *m, int incoming)
|
|
{
|
|
struct ip *ip;
|
|
struct inpcb *inp;
|
|
struct socket *sa;
|
|
u_int16_t nport;
|
|
struct sockaddr_in divsrc;
|
|
struct m_tag *mtag;
|
|
|
|
mtag = m_tag_find(m, PACKET_TAG_DIVERT, NULL);
|
|
if (mtag == NULL) {
|
|
printf("%s: no divert tag\n", __func__);
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
/* Assure header */
|
|
if (m->m_len < sizeof(struct ip) &&
|
|
(m = m_pullup(m, sizeof(struct ip))) == 0)
|
|
return;
|
|
ip = mtod(m, struct ip *);
|
|
|
|
/* Delayed checksums are currently not compatible with divert. */
|
|
if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
|
|
ip->ip_len = ntohs(ip->ip_len);
|
|
in_delayed_cksum(m);
|
|
m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
|
|
ip->ip_len = htons(ip->ip_len);
|
|
}
|
|
|
|
/*
|
|
* Record receive interface address, if any.
|
|
* But only for incoming packets.
|
|
*/
|
|
bzero(&divsrc, sizeof(divsrc));
|
|
divsrc.sin_len = sizeof(divsrc);
|
|
divsrc.sin_family = AF_INET;
|
|
divsrc.sin_port = divert_cookie(mtag); /* record matching rule */
|
|
if (incoming) {
|
|
struct ifaddr *ifa;
|
|
|
|
/* Sanity check */
|
|
M_ASSERTPKTHDR(m);
|
|
|
|
/* Find IP address for receive interface */
|
|
TAILQ_FOREACH(ifa, &m->m_pkthdr.rcvif->if_addrhead, ifa_link) {
|
|
if (ifa->ifa_addr->sa_family != AF_INET)
|
|
continue;
|
|
divsrc.sin_addr =
|
|
((struct sockaddr_in *) ifa->ifa_addr)->sin_addr;
|
|
break;
|
|
}
|
|
}
|
|
/*
|
|
* Record the incoming interface name whenever we have one.
|
|
*/
|
|
if (m->m_pkthdr.rcvif) {
|
|
/*
|
|
* Hide the actual interface name in there in the
|
|
* sin_zero array. XXX This needs to be moved to a
|
|
* different sockaddr type for divert, e.g.
|
|
* sockaddr_div with multiple fields like
|
|
* sockaddr_dl. Presently we have only 7 bytes
|
|
* but that will do for now as most interfaces
|
|
* are 4 or less + 2 or less bytes for unit.
|
|
* There is probably a faster way of doing this,
|
|
* possibly taking it from the sockaddr_dl on the iface.
|
|
* This solves the problem of a P2P link and a LAN interface
|
|
* having the same address, which can result in the wrong
|
|
* interface being assigned to the packet when fed back
|
|
* into the divert socket. Theoretically if the daemon saves
|
|
* and re-uses the sockaddr_in as suggested in the man pages,
|
|
* this iface name will come along for the ride.
|
|
* (see div_output for the other half of this.)
|
|
*/
|
|
strlcpy(divsrc.sin_zero, m->m_pkthdr.rcvif->if_xname,
|
|
sizeof(divsrc.sin_zero));
|
|
}
|
|
|
|
/* Put packet on socket queue, if any */
|
|
sa = NULL;
|
|
nport = htons((u_int16_t)divert_info(mtag));
|
|
INP_INFO_RLOCK(&divcbinfo);
|
|
LIST_FOREACH(inp, &divcb, inp_list) {
|
|
INP_LOCK(inp);
|
|
/* XXX why does only one socket match? */
|
|
if (inp->inp_lport == nport) {
|
|
sa = inp->inp_socket;
|
|
SOCKBUF_LOCK(&sa->so_rcv);
|
|
if (sbappendaddr_locked(&sa->so_rcv,
|
|
(struct sockaddr *)&divsrc, m,
|
|
(struct mbuf *)0) == 0) {
|
|
SOCKBUF_UNLOCK(&sa->so_rcv);
|
|
sa = NULL; /* force mbuf reclaim below */
|
|
} else
|
|
sorwakeup_locked(sa);
|
|
INP_UNLOCK(inp);
|
|
break;
|
|
}
|
|
INP_UNLOCK(inp);
|
|
}
|
|
INP_INFO_RUNLOCK(&divcbinfo);
|
|
if (sa == NULL) {
|
|
m_freem(m);
|
|
ipstat.ips_noproto++;
|
|
ipstat.ips_delivered--;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Deliver packet back into the IP processing machinery.
|
|
*
|
|
* If no address specified, or address is 0.0.0.0, send to ip_output();
|
|
* otherwise, send to ip_input() and mark as having been received on
|
|
* the interface with that address.
|
|
*/
|
|
static int
|
|
div_output(struct socket *so, struct mbuf *m, struct sockaddr_in *sin,
|
|
struct mbuf *control)
|
|
{
|
|
struct m_tag *mtag;
|
|
struct divert_tag *dt;
|
|
int error = 0;
|
|
|
|
/*
|
|
* An mbuf may hasn't come from userland, but we pretend
|
|
* that it has.
|
|
*/
|
|
m->m_pkthdr.rcvif = NULL;
|
|
m->m_nextpkt = NULL;
|
|
|
|
if (control)
|
|
m_freem(control); /* XXX */
|
|
|
|
if ((mtag = m_tag_find(m, PACKET_TAG_DIVERT, NULL)) == NULL) {
|
|
mtag = m_tag_get(PACKET_TAG_DIVERT, sizeof(struct divert_tag),
|
|
M_NOWAIT | M_ZERO);
|
|
if (mtag == NULL) {
|
|
error = ENOBUFS;
|
|
goto cantsend;
|
|
}
|
|
dt = (struct divert_tag *)(mtag+1);
|
|
m_tag_prepend(m, mtag);
|
|
} else
|
|
dt = (struct divert_tag *)(mtag+1);
|
|
|
|
/* Loopback avoidance and state recovery */
|
|
if (sin) {
|
|
int i;
|
|
|
|
dt->cookie = sin->sin_port;
|
|
/*
|
|
* Find receive interface with the given name, stuffed
|
|
* (if it exists) in the sin_zero[] field.
|
|
* The name is user supplied data so don't trust its size
|
|
* or that it is zero terminated.
|
|
*/
|
|
for (i = 0; i < sizeof(sin->sin_zero) && sin->sin_zero[i]; i++)
|
|
;
|
|
if ( i > 0 && i < sizeof(sin->sin_zero))
|
|
m->m_pkthdr.rcvif = ifunit(sin->sin_zero);
|
|
}
|
|
|
|
/* Reinject packet into the system as incoming or outgoing */
|
|
if (!sin || sin->sin_addr.s_addr == 0) {
|
|
struct ip *const ip = mtod(m, struct ip *);
|
|
struct inpcb *inp;
|
|
|
|
dt->info |= IP_FW_DIVERT_OUTPUT_FLAG;
|
|
INP_INFO_WLOCK(&divcbinfo);
|
|
inp = sotoinpcb(so);
|
|
INP_LOCK(inp);
|
|
/*
|
|
* Don't allow both user specified and setsockopt options,
|
|
* and don't allow packet length sizes that will crash
|
|
*/
|
|
if (((ip->ip_hl != (sizeof (*ip) >> 2)) && inp->inp_options) ||
|
|
((u_short)ntohs(ip->ip_len) > m->m_pkthdr.len)) {
|
|
error = EINVAL;
|
|
m_freem(m);
|
|
} else {
|
|
/* Convert fields to host order for ip_output() */
|
|
ip->ip_len = ntohs(ip->ip_len);
|
|
ip->ip_off = ntohs(ip->ip_off);
|
|
|
|
/* Send packet to output processing */
|
|
ipstat.ips_rawout++; /* XXX */
|
|
|
|
#ifdef MAC
|
|
mac_create_mbuf_from_inpcb(inp, m);
|
|
#endif
|
|
error = ip_output(m,
|
|
inp->inp_options, NULL,
|
|
((so->so_options & SO_DONTROUTE) ?
|
|
IP_ROUTETOIF : 0) |
|
|
IP_ALLOWBROADCAST | IP_RAWOUTPUT,
|
|
inp->inp_moptions, NULL);
|
|
}
|
|
INP_UNLOCK(inp);
|
|
INP_INFO_WUNLOCK(&divcbinfo);
|
|
} else {
|
|
dt->info |= IP_FW_DIVERT_LOOPBACK_FLAG;
|
|
if (m->m_pkthdr.rcvif == NULL) {
|
|
/*
|
|
* No luck with the name, check by IP address.
|
|
* Clear the port and the ifname to make sure
|
|
* there are no distractions for ifa_ifwithaddr.
|
|
*/
|
|
struct ifaddr *ifa;
|
|
|
|
bzero(sin->sin_zero, sizeof(sin->sin_zero));
|
|
sin->sin_port = 0;
|
|
ifa = ifa_ifwithaddr((struct sockaddr *) sin);
|
|
if (ifa == NULL) {
|
|
error = EADDRNOTAVAIL;
|
|
goto cantsend;
|
|
}
|
|
m->m_pkthdr.rcvif = ifa->ifa_ifp;
|
|
}
|
|
#ifdef MAC
|
|
SOCK_LOCK(so);
|
|
mac_create_mbuf_from_socket(so, m);
|
|
SOCK_UNLOCK(so);
|
|
#endif
|
|
/* Send packet to input processing */
|
|
ip_input(m);
|
|
}
|
|
|
|
return error;
|
|
|
|
cantsend:
|
|
m_freem(m);
|
|
return error;
|
|
}
|
|
|
|
static int
|
|
div_attach(struct socket *so, int proto, struct thread *td)
|
|
{
|
|
struct inpcb *inp;
|
|
int error;
|
|
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp == NULL, ("div_attach: inp != NULL"));
|
|
if (td != NULL) {
|
|
error = priv_check(td, PRIV_NETINET_DIVERT);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
error = soreserve(so, div_sendspace, div_recvspace);
|
|
if (error)
|
|
return error;
|
|
INP_INFO_WLOCK(&divcbinfo);
|
|
error = in_pcballoc(so, &divcbinfo);
|
|
if (error) {
|
|
INP_INFO_WUNLOCK(&divcbinfo);
|
|
return error;
|
|
}
|
|
inp = (struct inpcb *)so->so_pcb;
|
|
INP_INFO_WUNLOCK(&divcbinfo);
|
|
inp->inp_ip_p = proto;
|
|
inp->inp_vflag |= INP_IPV4;
|
|
inp->inp_flags |= INP_HDRINCL;
|
|
INP_UNLOCK(inp);
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
div_detach(struct socket *so)
|
|
{
|
|
struct inpcb *inp;
|
|
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp != NULL, ("div_detach: inp == NULL"));
|
|
INP_INFO_WLOCK(&divcbinfo);
|
|
INP_LOCK(inp);
|
|
in_pcbdetach(inp);
|
|
in_pcbfree(inp);
|
|
INP_INFO_WUNLOCK(&divcbinfo);
|
|
}
|
|
|
|
static int
|
|
div_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
|
|
{
|
|
struct inpcb *inp;
|
|
int error;
|
|
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp != NULL, ("div_bind: inp == NULL"));
|
|
/* in_pcbbind assumes that nam is a sockaddr_in
|
|
* and in_pcbbind requires a valid address. Since divert
|
|
* sockets don't we need to make sure the address is
|
|
* filled in properly.
|
|
* XXX -- divert should not be abusing in_pcbind
|
|
* and should probably have its own family.
|
|
*/
|
|
if (nam->sa_family != AF_INET)
|
|
return EAFNOSUPPORT;
|
|
((struct sockaddr_in *)nam)->sin_addr.s_addr = INADDR_ANY;
|
|
INP_INFO_WLOCK(&divcbinfo);
|
|
INP_LOCK(inp);
|
|
error = in_pcbbind(inp, nam, td->td_ucred);
|
|
INP_UNLOCK(inp);
|
|
INP_INFO_WUNLOCK(&divcbinfo);
|
|
return error;
|
|
}
|
|
|
|
static int
|
|
div_shutdown(struct socket *so)
|
|
{
|
|
struct inpcb *inp;
|
|
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp != NULL, ("div_shutdown: inp == NULL"));
|
|
INP_LOCK(inp);
|
|
socantsendmore(so);
|
|
INP_UNLOCK(inp);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
div_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
|
|
struct mbuf *control, struct thread *td)
|
|
{
|
|
/* Packet must have a header (but that's about it) */
|
|
if (m->m_len < sizeof (struct ip) &&
|
|
(m = m_pullup(m, sizeof (struct ip))) == 0) {
|
|
ipstat.ips_toosmall++;
|
|
m_freem(m);
|
|
return EINVAL;
|
|
}
|
|
|
|
/* Send packet */
|
|
return div_output(so, m, (struct sockaddr_in *)nam, control);
|
|
}
|
|
|
|
void
|
|
div_ctlinput(int cmd, struct sockaddr *sa, void *vip)
|
|
{
|
|
struct in_addr faddr;
|
|
|
|
faddr = ((struct sockaddr_in *)sa)->sin_addr;
|
|
if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
|
|
return;
|
|
if (PRC_IS_REDIRECT(cmd))
|
|
return;
|
|
}
|
|
|
|
static int
|
|
div_pcblist(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
int error, i, n;
|
|
struct inpcb *inp, **inp_list;
|
|
inp_gen_t gencnt;
|
|
struct xinpgen xig;
|
|
|
|
/*
|
|
* The process of preparing the TCB list is too time-consuming and
|
|
* resource-intensive to repeat twice on every request.
|
|
*/
|
|
if (req->oldptr == 0) {
|
|
n = divcbinfo.ipi_count;
|
|
req->oldidx = 2 * (sizeof xig)
|
|
+ (n + n/8) * sizeof(struct xinpcb);
|
|
return 0;
|
|
}
|
|
|
|
if (req->newptr != 0)
|
|
return EPERM;
|
|
|
|
/*
|
|
* OK, now we're committed to doing something.
|
|
*/
|
|
INP_INFO_RLOCK(&divcbinfo);
|
|
gencnt = divcbinfo.ipi_gencnt;
|
|
n = divcbinfo.ipi_count;
|
|
INP_INFO_RUNLOCK(&divcbinfo);
|
|
|
|
error = sysctl_wire_old_buffer(req,
|
|
2 * sizeof(xig) + n*sizeof(struct xinpcb));
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
xig.xig_len = sizeof xig;
|
|
xig.xig_count = n;
|
|
xig.xig_gen = gencnt;
|
|
xig.xig_sogen = so_gencnt;
|
|
error = SYSCTL_OUT(req, &xig, sizeof xig);
|
|
if (error)
|
|
return error;
|
|
|
|
inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK);
|
|
if (inp_list == 0)
|
|
return ENOMEM;
|
|
|
|
INP_INFO_RLOCK(&divcbinfo);
|
|
for (inp = LIST_FIRST(divcbinfo.ipi_listhead), i = 0; inp && i < n;
|
|
inp = LIST_NEXT(inp, inp_list)) {
|
|
INP_LOCK(inp);
|
|
if (inp->inp_gencnt <= gencnt &&
|
|
cr_canseesocket(req->td->td_ucred, inp->inp_socket) == 0)
|
|
inp_list[i++] = inp;
|
|
INP_UNLOCK(inp);
|
|
}
|
|
INP_INFO_RUNLOCK(&divcbinfo);
|
|
n = i;
|
|
|
|
error = 0;
|
|
for (i = 0; i < n; i++) {
|
|
inp = inp_list[i];
|
|
INP_LOCK(inp);
|
|
if (inp->inp_gencnt <= gencnt) {
|
|
struct xinpcb xi;
|
|
bzero(&xi, sizeof(xi));
|
|
xi.xi_len = sizeof xi;
|
|
/* XXX should avoid extra copy */
|
|
bcopy(inp, &xi.xi_inp, sizeof *inp);
|
|
if (inp->inp_socket)
|
|
sotoxsocket(inp->inp_socket, &xi.xi_socket);
|
|
INP_UNLOCK(inp);
|
|
error = SYSCTL_OUT(req, &xi, sizeof xi);
|
|
} else
|
|
INP_UNLOCK(inp);
|
|
}
|
|
if (!error) {
|
|
/*
|
|
* Give the user an updated idea of our state.
|
|
* If the generation differs from what we told
|
|
* her before, she knows that something happened
|
|
* while we were processing this request, and it
|
|
* might be necessary to retry.
|
|
*/
|
|
INP_INFO_RLOCK(&divcbinfo);
|
|
xig.xig_gen = divcbinfo.ipi_gencnt;
|
|
xig.xig_sogen = so_gencnt;
|
|
xig.xig_count = divcbinfo.ipi_count;
|
|
INP_INFO_RUNLOCK(&divcbinfo);
|
|
error = SYSCTL_OUT(req, &xig, sizeof xig);
|
|
}
|
|
free(inp_list, M_TEMP);
|
|
return error;
|
|
}
|
|
|
|
#ifdef SYSCTL_NODE
|
|
SYSCTL_NODE(_net_inet, IPPROTO_DIVERT, divert, CTLFLAG_RW, 0, "IPDIVERT");
|
|
SYSCTL_PROC(_net_inet_divert, OID_AUTO, pcblist, CTLFLAG_RD, 0, 0,
|
|
div_pcblist, "S,xinpcb", "List of active divert sockets");
|
|
#endif
|
|
|
|
struct pr_usrreqs div_usrreqs = {
|
|
.pru_attach = div_attach,
|
|
.pru_bind = div_bind,
|
|
.pru_control = in_control,
|
|
.pru_detach = div_detach,
|
|
.pru_peeraddr = in_getpeeraddr,
|
|
.pru_send = div_send,
|
|
.pru_shutdown = div_shutdown,
|
|
.pru_sockaddr = in_getsockaddr,
|
|
.pru_sosetlabel = in_pcbsosetlabel
|
|
};
|
|
|
|
struct protosw div_protosw = {
|
|
.pr_type = SOCK_RAW,
|
|
.pr_protocol = IPPROTO_DIVERT,
|
|
.pr_flags = PR_ATOMIC|PR_ADDR,
|
|
.pr_input = div_input,
|
|
.pr_ctlinput = div_ctlinput,
|
|
.pr_ctloutput = ip_ctloutput,
|
|
.pr_init = div_init,
|
|
.pr_usrreqs = &div_usrreqs
|
|
};
|
|
|
|
static int
|
|
div_modevent(module_t mod, int type, void *unused)
|
|
{
|
|
int err = 0;
|
|
int n;
|
|
|
|
switch (type) {
|
|
case MOD_LOAD:
|
|
/*
|
|
* Protocol will be initialized by pf_proto_register().
|
|
* We don't have to register ip_protox because we are not
|
|
* a true IP protocol that goes over the wire.
|
|
*/
|
|
err = pf_proto_register(PF_INET, &div_protosw);
|
|
ip_divert_ptr = divert_packet;
|
|
break;
|
|
case MOD_QUIESCE:
|
|
/*
|
|
* IPDIVERT may normally not be unloaded because of the
|
|
* potential race conditions. Tell kldunload we can't be
|
|
* unloaded unless the unload is forced.
|
|
*/
|
|
err = EPERM;
|
|
break;
|
|
case MOD_UNLOAD:
|
|
/*
|
|
* Forced unload.
|
|
*
|
|
* Module ipdivert can only be unloaded if no sockets are
|
|
* connected. Maybe this can be changed later to forcefully
|
|
* disconnect any open sockets.
|
|
*
|
|
* XXXRW: Note that there is a slight race here, as a new
|
|
* socket open request could be spinning on the lock and then
|
|
* we destroy the lock.
|
|
*/
|
|
INP_INFO_WLOCK(&divcbinfo);
|
|
n = divcbinfo.ipi_count;
|
|
if (n != 0) {
|
|
err = EBUSY;
|
|
INP_INFO_WUNLOCK(&divcbinfo);
|
|
break;
|
|
}
|
|
ip_divert_ptr = NULL;
|
|
err = pf_proto_unregister(PF_INET, IPPROTO_DIVERT, SOCK_RAW);
|
|
INP_INFO_WUNLOCK(&divcbinfo);
|
|
INP_INFO_LOCK_DESTROY(&divcbinfo);
|
|
uma_zdestroy(divcbinfo.ipi_zone);
|
|
break;
|
|
default:
|
|
err = EOPNOTSUPP;
|
|
break;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static moduledata_t ipdivertmod = {
|
|
"ipdivert",
|
|
div_modevent,
|
|
0
|
|
};
|
|
|
|
DECLARE_MODULE(ipdivert, ipdivertmod, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY);
|
|
MODULE_DEPEND(dummynet, ipfw, 2, 2, 2);
|
|
MODULE_VERSION(ipdivert, 1);
|