841 lines
22 KiB
C
841 lines
22 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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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include "opt_sctp.h"
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#ifndef INET
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#error "IPDIVERT requires INET"
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#endif
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#include <sys/param.h>
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#include <sys/eventhandler.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/socket.h>
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#include <sys/socketvar.h>
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#include <sys/sysctl.h>
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#include <net/vnet.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <net/netisr.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_var.h>
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#ifdef INET6
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#include <netinet/ip6.h>
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#include <netinet6/ip6_var.h>
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#endif
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#ifdef SCTP
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#include <netinet/sctp_crc32.h>
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#endif
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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 or other packet filters,
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* see the divert(4) manpage for features.
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* Packets are selected by the packet filter and tagged with an
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* MTAG_IPFW_RULE tag carrying the 'divert port' number (as set by
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* the packet filter) and information on the matching filter rule for
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* subsequent reinjection. The divert_port is used to put the packet
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* on the corresponding divert socket, while the rule number is passed
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* up (at least partially) as the sin_port in the struct sockaddr.
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*
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* Packets written to the divert socket carry in sin_addr a
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* destination address, and in sin_port the number of the filter rule
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* after which to continue processing.
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* If the destination address is INADDR_ANY, the packet is treated as
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* as outgoing and sent to ip_output(); otherwise it is treated as
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* incoming and sent to ip_input().
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* Further, sin_zero carries some information on the interface,
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* which can be used in the reinject -- see comments in the code.
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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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* packet filter processing will start at the rule number after the one
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* written in the sin_port (ipfw does not allow a rule #0, so sin_port=0
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* will apply the entire ruleset to the packet).
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*/
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/* Internal variables. */
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static VNET_DEFINE(struct inpcbhead, divcb);
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static VNET_DEFINE(struct inpcbinfo, divcbinfo);
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#define V_divcb VNET(divcb)
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#define V_divcbinfo VNET(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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static eventhandler_tag ip_divert_event_tag;
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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(V_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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static void
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div_init(void)
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{
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/*
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* XXX We don't use the hash list for divert IP, but it's easier to
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* allocate one-entry hash lists than it is to check all over the
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* place for hashbase == NULL.
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*/
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in_pcbinfo_init(&V_divcbinfo, "div", &V_divcb, 1, 1, "divcb",
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div_inpcb_init, div_inpcb_fini, UMA_ZONE_NOFREE,
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IPI_HASHFIELDS_NONE);
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}
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static void
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div_destroy(void)
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{
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in_pcbinfo_destroy(&V_divcbinfo);
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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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static int
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div_input(struct mbuf **mp, int *offp, int proto)
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{
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struct mbuf *m = *mp;
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KMOD_IPSTAT_INC(ips_noproto);
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m_freem(m);
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return (IPPROTO_DONE);
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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_locate(m, MTAG_IPFW_RULE, 0, NULL);
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if (mtag == NULL) {
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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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in_delayed_cksum(m);
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m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
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}
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#ifdef SCTP
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if (m->m_pkthdr.csum_flags & CSUM_SCTP) {
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sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2));
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m->m_pkthdr.csum_flags &= ~CSUM_SCTP;
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}
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#endif
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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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/* record matching rule, in host format */
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divsrc.sin_port = ((struct ipfw_rule_ref *)(mtag+1))->rulenum;
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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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if (incoming) {
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struct ifaddr *ifa;
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struct ifnet *ifp;
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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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ifp = m->m_pkthdr.rcvif;
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if_addr_rlock(ifp);
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TAILQ_FOREACH(ifa, &ifp->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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if_addr_runlock(ifp);
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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)(((struct ipfw_rule_ref *)(mtag+1))->info));
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INP_INFO_RLOCK(&V_divcbinfo);
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LIST_FOREACH(inp, &V_divcb, inp_list) {
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/* XXX why does only one socket match? */
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if (inp->inp_lport == nport) {
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INP_RLOCK(inp);
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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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}
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INP_INFO_RUNLOCK(&V_divcbinfo);
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if (sa == NULL) {
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m_freem(m);
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KMOD_IPSTAT_INC(ips_noproto);
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KMOD_IPSTAT_DEC(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 ip *const ip = mtod(m, struct ip *);
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struct m_tag *mtag;
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struct ipfw_rule_ref *dt;
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int error = 0;
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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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M_SETFIB(m, so->so_fibnum);
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if (control)
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m_freem(control); /* XXX */
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mtag = m_tag_locate(m, MTAG_IPFW_RULE, 0, NULL);
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if (mtag == NULL) {
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/* this should be normal */
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mtag = m_tag_alloc(MTAG_IPFW_RULE, 0,
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sizeof(struct ipfw_rule_ref), 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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m_tag_prepend(m, mtag);
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}
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dt = (struct ipfw_rule_ref *)(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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/* set the starting point. We provide a non-zero slot,
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* but a non_matching chain_id to skip that info and use
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* the rulenum/rule_id.
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*/
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dt->slot = 1; /* dummy, chain_id is invalid */
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dt->chain_id = 0;
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dt->rulenum = sin->sin_port+1; /* host format ? */
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dt->rule_id = 0;
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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 mbuf *options = NULL;
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struct inpcb *inp;
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dt->info |= IPFW_IS_DIVERT | IPFW_INFO_OUT;
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inp = sotoinpcb(so);
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INP_RLOCK(inp);
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switch (ip->ip_v) {
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case IPVERSION:
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/*
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* Don't allow both user specified and setsockopt
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* options, and don't allow packet length sizes that
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* will crash.
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*/
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if ((((ip->ip_hl << 2) != sizeof(struct ip)) &&
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inp->inp_options != NULL) ||
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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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goto cantsend;
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}
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break;
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#ifdef INET6
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case IPV6_VERSION >> 4:
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{
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struct ip6_hdr *const ip6 = mtod(m, struct ip6_hdr *);
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/* Don't allow packet length sizes that will crash */
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if (((u_short)ntohs(ip6->ip6_plen) > m->m_pkthdr.len)) {
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error = EINVAL;
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INP_RUNLOCK(inp);
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goto cantsend;
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}
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break;
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}
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#endif
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default:
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error = EINVAL;
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INP_RUNLOCK(inp);
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goto cantsend;
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}
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/* Send packet to output processing */
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KMOD_IPSTAT_INC(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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/*
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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_NOWAIT);
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if (options == NULL) {
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INP_RUNLOCK(inp);
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error = ENOBUFS;
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goto cantsend;
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}
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}
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INP_RUNLOCK(inp);
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switch (ip->ip_v) {
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case IPVERSION:
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error = ip_output(m, options, NULL,
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((so->so_options & SO_DONTROUTE) ? IP_ROUTETOIF : 0)
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| IP_ALLOWBROADCAST | IP_RAWOUTPUT, NULL, NULL);
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break;
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#ifdef INET6
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case IPV6_VERSION >> 4:
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error = ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL);
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break;
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#endif
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}
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if (options != NULL)
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m_freem(options);
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} else {
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dt->info |= IPFW_IS_DIVERT | IPFW_INFO_IN;
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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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ifa_free(ifa);
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}
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#ifdef MAC
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mac_socket_create_mbuf(so, m);
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#endif
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/* Send packet to input processing via netisr */
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switch (ip->ip_v) {
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case IPVERSION:
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netisr_queue_src(NETISR_IP, (uintptr_t)so, m);
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break;
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#ifdef INET6
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case IPV6_VERSION >> 4:
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netisr_queue_src(NETISR_IPV6, (uintptr_t)so, m);
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break;
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#endif
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default:
|
|
error = EINVAL;
|
|
goto cantsend;
|
|
}
|
|
}
|
|
|
|
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(&V_divcbinfo);
|
|
error = in_pcballoc(so, &V_divcbinfo);
|
|
if (error) {
|
|
INP_INFO_WUNLOCK(&V_divcbinfo);
|
|
return error;
|
|
}
|
|
inp = (struct inpcb *)so->so_pcb;
|
|
INP_INFO_WUNLOCK(&V_divcbinfo);
|
|
inp->inp_ip_p = proto;
|
|
inp->inp_vflag |= INP_IPV4;
|
|
inp->inp_flags |= INP_HDRINCL;
|
|
INP_WUNLOCK(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(&V_divcbinfo);
|
|
INP_WLOCK(inp);
|
|
in_pcbdetach(inp);
|
|
in_pcbfree(inp);
|
|
INP_INFO_WUNLOCK(&V_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(&V_divcbinfo);
|
|
INP_WLOCK(inp);
|
|
INP_HASH_WLOCK(&V_divcbinfo);
|
|
error = in_pcbbind(inp, nam, td->td_ucred);
|
|
INP_HASH_WUNLOCK(&V_divcbinfo);
|
|
INP_WUNLOCK(inp);
|
|
INP_INFO_WUNLOCK(&V_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) {
|
|
KMOD_IPSTAT_INC(ips_toosmall);
|
|
m_freem(m);
|
|
return EINVAL;
|
|
}
|
|
|
|
/* Send packet */
|
|
return div_output(so, m, (struct sockaddr_in *)nam, control);
|
|
}
|
|
|
|
static 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 = V_divcbinfo.ipi_count;
|
|
n += imax(n / 8, 10);
|
|
req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xinpcb);
|
|
return 0;
|
|
}
|
|
|
|
if (req->newptr != 0)
|
|
return EPERM;
|
|
|
|
/*
|
|
* OK, now we're committed to doing something.
|
|
*/
|
|
INP_INFO_RLOCK(&V_divcbinfo);
|
|
gencnt = V_divcbinfo.ipi_gencnt;
|
|
n = V_divcbinfo.ipi_count;
|
|
INP_INFO_RUNLOCK(&V_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(&V_divcbinfo);
|
|
for (inp = LIST_FIRST(V_divcbinfo.ipi_listhead), i = 0; inp && i < n;
|
|
inp = LIST_NEXT(inp, inp_list)) {
|
|
INP_WLOCK(inp);
|
|
if (inp->inp_gencnt <= gencnt &&
|
|
cr_canseeinpcb(req->td->td_ucred, inp) == 0) {
|
|
in_pcbref(inp);
|
|
inp_list[i++] = inp;
|
|
}
|
|
INP_WUNLOCK(inp);
|
|
}
|
|
INP_INFO_RUNLOCK(&V_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);
|
|
}
|
|
INP_INFO_WLOCK(&V_divcbinfo);
|
|
for (i = 0; i < n; i++) {
|
|
inp = inp_list[i];
|
|
INP_RLOCK(inp);
|
|
if (!in_pcbrele_rlocked(inp))
|
|
INP_RUNLOCK(inp);
|
|
}
|
|
INP_INFO_WUNLOCK(&V_divcbinfo);
|
|
|
|
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(&V_divcbinfo);
|
|
xig.xig_gen = V_divcbinfo.ipi_gencnt;
|
|
xig.xig_sogen = so_gencnt;
|
|
xig.xig_count = V_divcbinfo.ipi_count;
|
|
INP_INFO_RUNLOCK(&V_divcbinfo);
|
|
error = SYSCTL_OUT(req, &xig, sizeof xig);
|
|
}
|
|
free(inp_list, M_TEMP);
|
|
return error;
|
|
}
|
|
|
|
#ifdef SYSCTL_NODE
|
|
static SYSCTL_NODE(_net_inet, IPPROTO_DIVERT, divert, CTLFLAG_RW, 0,
|
|
"IPDIVERT");
|
|
SYSCTL_PROC(_net_inet_divert, OID_AUTO, pcblist, CTLTYPE_OPAQUE | CTLFLAG_RD,
|
|
NULL, 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,
|
|
#ifdef VIMAGE
|
|
.pr_destroy = div_destroy,
|
|
#endif
|
|
.pr_usrreqs = &div_usrreqs
|
|
};
|
|
|
|
static int
|
|
div_modevent(module_t mod, int type, void *unused)
|
|
{
|
|
int err = 0;
|
|
#ifndef VIMAGE
|
|
int n;
|
|
#endif
|
|
|
|
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);
|
|
if (err != 0)
|
|
return (err);
|
|
ip_divert_ptr = divert_packet;
|
|
ip_divert_event_tag = EVENTHANDLER_REGISTER(maxsockets_change,
|
|
div_zone_change, NULL, EVENTHANDLER_PRI_ANY);
|
|
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:
|
|
#ifdef VIMAGE
|
|
err = EPERM;
|
|
break;
|
|
#else
|
|
/*
|
|
* 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(&V_divcbinfo);
|
|
n = V_divcbinfo.ipi_count;
|
|
if (n != 0) {
|
|
err = EBUSY;
|
|
INP_INFO_WUNLOCK(&V_divcbinfo);
|
|
break;
|
|
}
|
|
ip_divert_ptr = NULL;
|
|
err = pf_proto_unregister(PF_INET, IPPROTO_DIVERT, SOCK_RAW);
|
|
INP_INFO_WUNLOCK(&V_divcbinfo);
|
|
div_destroy();
|
|
EVENTHANDLER_DEREGISTER(maxsockets_change, ip_divert_event_tag);
|
|
break;
|
|
#endif /* !VIMAGE */
|
|
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(ipdivert, ipfw, 3, 3, 3);
|
|
MODULE_VERSION(ipdivert, 1);
|