757 lines
20 KiB
C
757 lines
20 KiB
C
/*-
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* Copyright (c) 1982, 1986, 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#if !defined(KLD_MODULE)
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#include "opt_inet.h"
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#include "opt_ipfw.h"
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#include "opt_mac.h"
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#ifndef INET
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#error "IPDIVERT requires INET."
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#endif
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#ifndef IPFIREWALL
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#error "IPDIVERT requires IPFIREWALL"
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#endif
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#endif
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/module.h>
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#include <sys/kernel.h>
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#include <sys/priv.h>
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#include <sys/proc.h>
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#include <sys/protosw.h>
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#include <sys/signalvar.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/sx.h>
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#include <sys/sysctl.h>
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#include <sys/systm.h>
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#include <vm/uma.h>
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#include <net/if.h>
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#include <net/netisr.h>
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#include <net/route.h>
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#include <netinet/in.h>
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#include <netinet/in_pcb.h>
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#include <netinet/in_systm.h>
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#include <netinet/in_var.h>
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#include <netinet/ip.h>
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#include <netinet/ip_divert.h>
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#include <netinet/ip_var.h>
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#include <netinet/ip_fw.h>
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#include <security/mac/mac_framework.h>
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/*
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* Divert sockets
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*/
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/*
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* Allocate enough space to hold a full IP packet
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*/
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#define DIVSNDQ (65536 + 100)
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#define DIVRCVQ (65536 + 100)
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/*
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* Divert sockets work in conjunction with ipfw, see the divert(4)
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* manpage for features.
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* Internally, packets selected by ipfw in ip_input() or ip_output(),
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* and never diverted before, are passed to the input queue of the
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* divert socket with a given 'divert_port' number (as specified in
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* the matching ipfw rule), and they are tagged with a 16 bit cookie
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* (representing the rule number of the matching ipfw rule), which
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* is passed to process reading from the socket.
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*
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* Packets written to the divert socket are again tagged with a cookie
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* (usually the same as above) and a destination address.
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* If the destination address is INADDR_ANY then the packet is
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* treated as outgoing and sent to ip_output(), otherwise it is
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* treated as incoming and sent to ip_input().
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* In both cases, the packet is tagged with the cookie.
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*
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* On reinjection, processing in ip_input() and ip_output()
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* will be exactly the same as for the original packet, except that
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* ipfw processing will start at the rule number after the one
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* written in the cookie (so, tagging a packet with a cookie of 0
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* will cause it to be effectively considered as a standard packet).
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*/
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/* Internal variables. */
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static struct inpcbhead divcb;
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static struct inpcbinfo divcbinfo;
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static u_long div_sendspace = DIVSNDQ; /* XXX sysctl ? */
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static u_long div_recvspace = DIVRCVQ; /* XXX sysctl ? */
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/*
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* Initialize divert connection block queue.
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*/
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static void
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div_zone_change(void *tag)
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{
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uma_zone_set_max(divcbinfo.ipi_zone, maxsockets);
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}
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static int
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div_inpcb_init(void *mem, int size, int flags)
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{
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struct inpcb *inp = mem;
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INP_LOCK_INIT(inp, "inp", "divinp");
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return (0);
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}
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static void
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div_inpcb_fini(void *mem, int size)
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{
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struct inpcb *inp = mem;
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INP_LOCK_DESTROY(inp);
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}
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void
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div_init(void)
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{
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INP_INFO_LOCK_INIT(&divcbinfo, "div");
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LIST_INIT(&divcb);
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divcbinfo.ipi_listhead = &divcb;
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/*
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* XXX We don't use the hash list for divert IP, but it's easier
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* to allocate a one entry hash list than it is to check all
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* over the place for hashbase == NULL.
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*/
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divcbinfo.ipi_hashbase = hashinit(1, M_PCB, &divcbinfo.ipi_hashmask);
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divcbinfo.ipi_porthashbase = hashinit(1, M_PCB,
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&divcbinfo.ipi_porthashmask);
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divcbinfo.ipi_zone = uma_zcreate("divcb", sizeof(struct inpcb),
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NULL, NULL, div_inpcb_init, div_inpcb_fini, UMA_ALIGN_PTR,
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UMA_ZONE_NOFREE);
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uma_zone_set_max(divcbinfo.ipi_zone, maxsockets);
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EVENTHANDLER_REGISTER(maxsockets_change, div_zone_change,
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NULL, EVENTHANDLER_PRI_ANY);
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}
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/*
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* IPPROTO_DIVERT is not in the real IP protocol number space; this
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* function should never be called. Just in case, drop any packets.
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*/
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void
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div_input(struct mbuf *m, int off)
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{
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ipstat.ips_noproto++;
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m_freem(m);
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}
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/*
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* Divert a packet by passing it up to the divert socket at port 'port'.
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*
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* Setup generic address and protocol structures for div_input routine,
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* then pass them along with mbuf chain.
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*/
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static void
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divert_packet(struct mbuf *m, int incoming)
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{
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struct ip *ip;
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struct inpcb *inp;
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struct socket *sa;
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u_int16_t nport;
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struct sockaddr_in divsrc;
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struct m_tag *mtag;
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mtag = m_tag_find(m, PACKET_TAG_DIVERT, NULL);
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if (mtag == NULL) {
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printf("%s: no divert tag\n", __func__);
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m_freem(m);
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return;
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}
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/* Assure header */
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if (m->m_len < sizeof(struct ip) &&
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(m = m_pullup(m, sizeof(struct ip))) == 0)
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return;
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ip = mtod(m, struct ip *);
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/* Delayed checksums are currently not compatible with divert. */
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if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
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ip->ip_len = ntohs(ip->ip_len);
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in_delayed_cksum(m);
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m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
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ip->ip_len = htons(ip->ip_len);
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}
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/*
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* Record receive interface address, if any.
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* But only for incoming packets.
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*/
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bzero(&divsrc, sizeof(divsrc));
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divsrc.sin_len = sizeof(divsrc);
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divsrc.sin_family = AF_INET;
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divsrc.sin_port = divert_cookie(mtag); /* record matching rule */
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if (incoming) {
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struct ifaddr *ifa;
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/* Sanity check */
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M_ASSERTPKTHDR(m);
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/* Find IP address for receive interface */
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TAILQ_FOREACH(ifa, &m->m_pkthdr.rcvif->if_addrhead, ifa_link) {
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if (ifa->ifa_addr->sa_family != AF_INET)
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continue;
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divsrc.sin_addr =
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((struct sockaddr_in *) ifa->ifa_addr)->sin_addr;
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break;
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}
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}
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/*
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* Record the incoming interface name whenever we have one.
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*/
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if (m->m_pkthdr.rcvif) {
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/*
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* Hide the actual interface name in there in the
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* sin_zero array. XXX This needs to be moved to a
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* different sockaddr type for divert, e.g.
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* sockaddr_div with multiple fields like
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* sockaddr_dl. Presently we have only 7 bytes
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* but that will do for now as most interfaces
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* are 4 or less + 2 or less bytes for unit.
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* There is probably a faster way of doing this,
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* possibly taking it from the sockaddr_dl on the iface.
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* This solves the problem of a P2P link and a LAN interface
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* having the same address, which can result in the wrong
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* interface being assigned to the packet when fed back
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* into the divert socket. Theoretically if the daemon saves
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* and re-uses the sockaddr_in as suggested in the man pages,
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* this iface name will come along for the ride.
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* (see div_output for the other half of this.)
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*/
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strlcpy(divsrc.sin_zero, m->m_pkthdr.rcvif->if_xname,
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sizeof(divsrc.sin_zero));
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}
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/* Put packet on socket queue, if any */
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sa = NULL;
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nport = htons((u_int16_t)divert_info(mtag));
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INP_INFO_RLOCK(&divcbinfo);
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LIST_FOREACH(inp, &divcb, inp_list) {
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INP_RLOCK(inp);
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/* XXX why does only one socket match? */
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if (inp->inp_lport == nport) {
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sa = inp->inp_socket;
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SOCKBUF_LOCK(&sa->so_rcv);
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if (sbappendaddr_locked(&sa->so_rcv,
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(struct sockaddr *)&divsrc, m,
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(struct mbuf *)0) == 0) {
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SOCKBUF_UNLOCK(&sa->so_rcv);
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sa = NULL; /* force mbuf reclaim below */
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} else
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sorwakeup_locked(sa);
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INP_RUNLOCK(inp);
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break;
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}
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INP_RUNLOCK(inp);
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}
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INP_INFO_RUNLOCK(&divcbinfo);
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if (sa == NULL) {
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m_freem(m);
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ipstat.ips_noproto++;
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ipstat.ips_delivered--;
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}
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}
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/*
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* Deliver packet back into the IP processing machinery.
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*
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* If no address specified, or address is 0.0.0.0, send to ip_output();
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* otherwise, send to ip_input() and mark as having been received on
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* the interface with that address.
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*/
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static int
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div_output(struct socket *so, struct mbuf *m, struct sockaddr_in *sin,
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struct mbuf *control)
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{
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struct m_tag *mtag;
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struct divert_tag *dt;
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int error = 0;
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struct mbuf *options;
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/*
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* An mbuf may hasn't come from userland, but we pretend
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* that it has.
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*/
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m->m_pkthdr.rcvif = NULL;
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m->m_nextpkt = NULL;
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if (control)
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m_freem(control); /* XXX */
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if ((mtag = m_tag_find(m, PACKET_TAG_DIVERT, NULL)) == NULL) {
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mtag = m_tag_get(PACKET_TAG_DIVERT, sizeof(struct divert_tag),
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M_NOWAIT | M_ZERO);
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if (mtag == NULL) {
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error = ENOBUFS;
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goto cantsend;
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}
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dt = (struct divert_tag *)(mtag+1);
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m_tag_prepend(m, mtag);
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} else
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dt = (struct divert_tag *)(mtag+1);
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/* Loopback avoidance and state recovery */
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if (sin) {
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int i;
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dt->cookie = sin->sin_port;
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/*
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* Find receive interface with the given name, stuffed
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* (if it exists) in the sin_zero[] field.
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* The name is user supplied data so don't trust its size
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* or that it is zero terminated.
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*/
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for (i = 0; i < sizeof(sin->sin_zero) && sin->sin_zero[i]; i++)
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;
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if ( i > 0 && i < sizeof(sin->sin_zero))
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m->m_pkthdr.rcvif = ifunit(sin->sin_zero);
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}
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/* Reinject packet into the system as incoming or outgoing */
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if (!sin || sin->sin_addr.s_addr == 0) {
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struct ip *const ip = mtod(m, struct ip *);
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struct inpcb *inp;
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dt->info |= IP_FW_DIVERT_OUTPUT_FLAG;
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INP_INFO_WLOCK(&divcbinfo);
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inp = sotoinpcb(so);
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INP_RLOCK(inp);
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/*
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* Don't allow both user specified and setsockopt options,
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* and don't allow packet length sizes that will crash
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*/
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if (((ip->ip_hl != (sizeof (*ip) >> 2)) && inp->inp_options) ||
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((u_short)ntohs(ip->ip_len) > m->m_pkthdr.len)) {
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error = EINVAL;
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INP_RUNLOCK(inp);
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INP_INFO_WUNLOCK(&divcbinfo);
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m_freem(m);
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} else {
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/* Convert fields to host order for ip_output() */
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ip->ip_len = ntohs(ip->ip_len);
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ip->ip_off = ntohs(ip->ip_off);
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/* Send packet to output processing */
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ipstat.ips_rawout++; /* XXX */
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#ifdef MAC
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mac_inpcb_create_mbuf(inp, m);
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#endif
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/*
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* Get ready to inject the packet into ip_output().
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* Just in case socket options were specified on the
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* divert socket, we duplicate them. This is done
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* to avoid having to hold the PCB locks over the call
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* to ip_output(), as doing this results in a number of
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* lock ordering complexities.
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*
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* Note that we set the multicast options argument for
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* ip_output() to NULL since it should be invariant that
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* they are not present.
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*/
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KASSERT(inp->inp_moptions == NULL,
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("multicast options set on a divert socket"));
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options = NULL;
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/*
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* XXXCSJP: It is unclear to me whether or not it makes
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* sense for divert sockets to have options. However,
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* for now we will duplicate them with the INP locks
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* held so we can use them in ip_output() without
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* requring a reference to the pcb.
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*/
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if (inp->inp_options != NULL) {
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options = m_dup(inp->inp_options, M_DONTWAIT);
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if (options == NULL)
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error = ENOBUFS;
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}
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INP_RUNLOCK(inp);
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INP_INFO_WUNLOCK(&divcbinfo);
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if (error == ENOBUFS) {
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m_freem(m);
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return (error);
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}
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error = ip_output(m, options, NULL,
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((so->so_options & SO_DONTROUTE) ?
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IP_ROUTETOIF : 0) | IP_ALLOWBROADCAST |
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IP_RAWOUTPUT, NULL, NULL);
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if (options != NULL)
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m_freem(options);
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}
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} else {
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dt->info |= IP_FW_DIVERT_LOOPBACK_FLAG;
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if (m->m_pkthdr.rcvif == NULL) {
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/*
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* No luck with the name, check by IP address.
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* Clear the port and the ifname to make sure
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* there are no distractions for ifa_ifwithaddr.
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*/
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struct ifaddr *ifa;
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bzero(sin->sin_zero, sizeof(sin->sin_zero));
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sin->sin_port = 0;
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ifa = ifa_ifwithaddr((struct sockaddr *) sin);
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if (ifa == NULL) {
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error = EADDRNOTAVAIL;
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goto cantsend;
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}
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m->m_pkthdr.rcvif = ifa->ifa_ifp;
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}
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#ifdef MAC
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SOCK_LOCK(so);
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mac_socket_create_mbuf(so, m);
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SOCK_UNLOCK(so);
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#endif
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/* Send packet to input processing via netisr */
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netisr_queue(NETISR_IP, m);
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}
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return error;
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cantsend:
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m_freem(m);
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return error;
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}
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static int
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div_attach(struct socket *so, int proto, struct thread *td)
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{
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struct inpcb *inp;
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int error;
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inp = sotoinpcb(so);
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KASSERT(inp == NULL, ("div_attach: inp != NULL"));
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if (td != NULL) {
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error = priv_check(td, PRIV_NETINET_DIVERT);
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if (error)
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return (error);
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}
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error = soreserve(so, div_sendspace, div_recvspace);
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if (error)
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return error;
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INP_INFO_WLOCK(&divcbinfo);
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error = in_pcballoc(so, &divcbinfo);
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if (error) {
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INP_INFO_WUNLOCK(&divcbinfo);
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return error;
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}
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inp = (struct inpcb *)so->so_pcb;
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INP_INFO_WUNLOCK(&divcbinfo);
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inp->inp_ip_p = proto;
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inp->inp_vflag |= INP_IPV4;
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inp->inp_flags |= INP_HDRINCL;
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INP_WUNLOCK(inp);
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return 0;
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}
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static void
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div_detach(struct socket *so)
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{
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struct inpcb *inp;
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inp = sotoinpcb(so);
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KASSERT(inp != NULL, ("div_detach: inp == NULL"));
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INP_INFO_WLOCK(&divcbinfo);
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INP_WLOCK(inp);
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in_pcbdetach(inp);
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in_pcbfree(inp);
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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_WLOCK(inp);
|
|
error = in_pcbbind(inp, nam, td->td_ucred);
|
|
INP_WUNLOCK(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_WLOCK(inp);
|
|
socantsendmore(so);
|
|
INP_WUNLOCK(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_RLOCK(inp);
|
|
if (inp->inp_gencnt <= gencnt &&
|
|
cr_canseesocket(req->td->td_ucred, inp->inp_socket) == 0)
|
|
inp_list[i++] = inp;
|
|
INP_RUNLOCK(inp);
|
|
}
|
|
INP_INFO_RUNLOCK(&divcbinfo);
|
|
n = i;
|
|
|
|
error = 0;
|
|
for (i = 0; i < n; i++) {
|
|
inp = inp_list[i];
|
|
INP_RLOCK(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_RUNLOCK(inp);
|
|
error = SYSCTL_OUT(req, &xi, sizeof xi);
|
|
} else
|
|
INP_RUNLOCK(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);
|