1222 lines
31 KiB
C
1222 lines
31 KiB
C
/* $NetBSD: in_pcb.c,v 1.202 2022/11/04 09:05:41 ozaki-r Exp $ */
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/*
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* 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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* 3. Neither the name of the project 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 PROJECT 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 PROJECT 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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/*-
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* Copyright (c) 1998, 2011 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Coyote Point Systems, Inc.
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* This code is derived from software contributed to The NetBSD Foundation
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* by Public Access Networks Corporation ("Panix"). It was developed under
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* contract to Panix by Eric Haszlakiewicz and Thor Lancelot Simon.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 1982, 1986, 1991, 1993, 1995
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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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* 3. 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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* @(#)in_pcb.c 8.4 (Berkeley) 5/24/95
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: in_pcb.c,v 1.202 2022/11/04 09:05:41 ozaki-r Exp $");
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#ifdef _KERNEL_OPT
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#include "opt_inet.h"
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#include "opt_ipsec.h"
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#endif
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/ioctl.h>
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#include <sys/errno.h>
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#include <sys/time.h>
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#include <sys/once.h>
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#include <sys/pool.h>
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#include <sys/proc.h>
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#include <sys/kauth.h>
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#include <sys/uidinfo.h>
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#include <sys/domain.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/in_pcb.h>
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#include <netinet/in_var.h>
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#include <netinet/ip_var.h>
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#include <netinet/portalgo.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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#include <netinet6/in6_pcb.h>
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#endif
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#ifdef IPSEC
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#include <netipsec/ipsec.h>
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#include <netipsec/key.h>
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#endif /* IPSEC */
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#include <netinet/tcp_vtw.h>
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struct in_addr zeroin_addr;
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#define INPCBHASH_PORT(table, lport) \
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&(table)->inpt_porthashtbl[ntohs(lport) & (table)->inpt_porthash]
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#define INPCBHASH_BIND(table, laddr, lport) \
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&(table)->inpt_bindhashtbl[ \
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((ntohl((laddr).s_addr) + ntohs(lport))) & (table)->inpt_bindhash]
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#define INPCBHASH_CONNECT(table, faddr, fport, laddr, lport) \
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&(table)->inpt_connecthashtbl[ \
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((ntohl((faddr).s_addr) + ntohs(fport)) + \
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(ntohl((laddr).s_addr) + ntohs(lport))) & (table)->inpt_connecthash]
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int anonportmin = IPPORT_ANONMIN;
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int anonportmax = IPPORT_ANONMAX;
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int lowportmin = IPPORT_RESERVEDMIN;
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int lowportmax = IPPORT_RESERVEDMAX;
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static pool_cache_t in4pcb_pool_cache;
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#ifdef INET6
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static pool_cache_t in6pcb_pool_cache;
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#endif
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static int
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inpcb_poolinit(void)
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{
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in4pcb_pool_cache = pool_cache_init(sizeof(struct in4pcb), coherency_unit,
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0, 0, "in4pcbpl", NULL, IPL_NET, NULL, NULL, NULL);
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#ifdef INET6
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in6pcb_pool_cache = pool_cache_init(sizeof(struct in6pcb), coherency_unit,
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0, 0, "in6pcbpl", NULL, IPL_NET, NULL, NULL, NULL);
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#endif
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return 0;
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}
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void
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inpcb_init(struct inpcbtable *table, int bindhashsize, int connecthashsize)
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{
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static ONCE_DECL(control);
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TAILQ_INIT(&table->inpt_queue);
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table->inpt_porthashtbl = hashinit(bindhashsize, HASH_LIST, true,
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&table->inpt_porthash);
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table->inpt_bindhashtbl = hashinit(bindhashsize, HASH_LIST, true,
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&table->inpt_bindhash);
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table->inpt_connecthashtbl = hashinit(connecthashsize, HASH_LIST, true,
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&table->inpt_connecthash);
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table->inpt_lastlow = IPPORT_RESERVEDMAX;
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table->inpt_lastport = (in_port_t)anonportmax;
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RUN_ONCE(&control, inpcb_poolinit);
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}
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/*
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* inpcb_create: construct a new PCB and associated with a given socket.
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* Sets the PCB state to INP_ATTACHED and makes PCB globally visible.
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*/
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int
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inpcb_create(struct socket *so, void *v)
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{
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struct inpcbtable *table = v;
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struct inpcb *inp;
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int s;
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#ifdef INET6
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KASSERT(soaf(so) == AF_INET || soaf(so) == AF_INET6);
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if (soaf(so) == AF_INET)
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inp = pool_cache_get(in4pcb_pool_cache, PR_NOWAIT);
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else
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inp = pool_cache_get(in6pcb_pool_cache, PR_NOWAIT);
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#else
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KASSERT(soaf(so) == AF_INET);
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inp = pool_cache_get(in4pcb_pool_cache, PR_NOWAIT);
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#endif
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if (inp == NULL)
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return ENOBUFS;
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if (soaf(so) == AF_INET)
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memset(inp, 0, sizeof(struct in4pcb));
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#ifdef INET6
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else
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memset(inp, 0, sizeof(struct in6pcb));
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#endif
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inp->inp_af = soaf(so);
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inp->inp_table = table;
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inp->inp_socket = so;
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inp->inp_portalgo = PORTALGO_DEFAULT;
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inp->inp_bindportonsend = false;
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if (inp->inp_af == AF_INET) {
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in4p_errormtu(inp) = -1;
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in4p_prefsrcip(inp).s_addr = INADDR_ANY;
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}
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#ifdef INET6
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else {
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in6p_hops6(inp) = -1; /* use kernel default */
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if (ip6_v6only)
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inp->inp_flags |= IN6P_IPV6_V6ONLY;
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}
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#endif
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#if defined(IPSEC)
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if (ipsec_enabled) {
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int error = ipsec_init_pcbpolicy(so, &inp->inp_sp);
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if (error != 0) {
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#ifdef INET6
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if (inp->inp_af == AF_INET)
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pool_cache_put(in4pcb_pool_cache, inp);
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else
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pool_cache_put(in6pcb_pool_cache, inp);
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#else
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KASSERT(inp->inp_af == AF_INET);
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pool_cache_put(in4pcb_pool_cache, inp);
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#endif
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return error;
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}
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inp->inp_sp->sp_inp = inp;
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}
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#endif
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so->so_pcb = inp;
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s = splsoftnet();
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TAILQ_INSERT_HEAD(&table->inpt_queue, inp, inp_queue);
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LIST_INSERT_HEAD(INPCBHASH_PORT(table, inp->inp_lport), inp,
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inp_lhash);
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inpcb_set_state(inp, INP_ATTACHED);
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splx(s);
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return 0;
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}
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static int
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inpcb_set_port(struct sockaddr_in *sin, struct inpcb *inp, kauth_cred_t cred)
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{
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struct inpcbtable *table = inp->inp_table;
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struct socket *so = inp->inp_socket;
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in_port_t *lastport;
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in_port_t lport = 0;
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enum kauth_network_req req;
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int error;
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if (inp->inp_flags & INP_LOWPORT) {
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#ifndef IPNOPRIVPORTS
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req = KAUTH_REQ_NETWORK_BIND_PRIVPORT;
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#else
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req = KAUTH_REQ_NETWORK_BIND_PORT;
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#endif
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lastport = &table->inpt_lastlow;
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} else {
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req = KAUTH_REQ_NETWORK_BIND_PORT;
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lastport = &table->inpt_lastport;
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}
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/* XXX-kauth: KAUTH_REQ_NETWORK_BIND_AUTOASSIGN_{,PRIV}PORT */
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error = kauth_authorize_network(cred, KAUTH_NETWORK_BIND, req, so, sin,
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NULL);
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if (error)
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return EACCES;
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/*
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* Use RFC6056 randomized port selection
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*/
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error = portalgo_randport(&lport, inp, cred);
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if (error)
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return error;
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inp->inp_flags |= INP_ANONPORT;
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*lastport = lport;
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lport = htons(lport);
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inp->inp_lport = lport;
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inpcb_set_state(inp, INP_BOUND);
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return 0;
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}
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int
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inpcb_bindableaddr(const struct inpcb *inp, struct sockaddr_in *sin,
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kauth_cred_t cred)
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{
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int error = EADDRNOTAVAIL;
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struct ifaddr *ifa = NULL;
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int s;
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if (sin->sin_family != AF_INET)
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return EAFNOSUPPORT;
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s = pserialize_read_enter();
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if (IN_MULTICAST(sin->sin_addr.s_addr)) {
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/* Always succeed; port reuse handled in inpcb_bind_port(). */
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} else if (!in_nullhost(sin->sin_addr)) {
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struct in_ifaddr *ia;
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ia = in_get_ia(sin->sin_addr);
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/* check for broadcast addresses */
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if (ia == NULL) {
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ifa = ifa_ifwithaddr(sintosa(sin));
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if (ifa != NULL)
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ia = ifatoia(ifa);
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else if ((inp->inp_flags & INP_BINDANY) != 0) {
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error = 0;
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goto error;
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}
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}
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if (ia == NULL)
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goto error;
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if (ia->ia4_flags & IN_IFF_DUPLICATED)
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goto error;
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}
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error = 0;
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error:
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pserialize_read_exit(s);
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return error;
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}
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static int
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inpcb_bind_addr(struct inpcb *inp, struct sockaddr_in *sin, kauth_cred_t cred)
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{
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int error;
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error = inpcb_bindableaddr(inp, sin, cred);
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if (error == 0)
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in4p_laddr(inp) = sin->sin_addr;
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return error;
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}
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static int
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inpcb_bind_port(struct inpcb *inp, struct sockaddr_in *sin, kauth_cred_t cred)
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{
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struct inpcbtable *table = inp->inp_table;
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struct socket *so = inp->inp_socket;
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int reuseport = (so->so_options & SO_REUSEPORT);
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int wild = 0, error;
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if (IN_MULTICAST(sin->sin_addr.s_addr)) {
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/*
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* Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
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* allow complete duplication of binding if
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* SO_REUSEPORT is set, or if SO_REUSEADDR is set
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* and a multicast address is bound on both
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* new and duplicated sockets.
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*/
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if (so->so_options & (SO_REUSEADDR | SO_REUSEPORT))
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reuseport = SO_REUSEADDR|SO_REUSEPORT;
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}
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if (sin->sin_port == 0) {
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error = inpcb_set_port(sin, inp, cred);
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if (error)
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return error;
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} else {
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struct inpcb *t;
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vestigial_inpcb_t vestige;
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#ifdef INET6
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struct inpcb *t6;
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struct in6_addr mapped;
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#endif
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enum kauth_network_req req;
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if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
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wild = 1;
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#ifndef IPNOPRIVPORTS
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if (ntohs(sin->sin_port) < IPPORT_RESERVED)
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req = KAUTH_REQ_NETWORK_BIND_PRIVPORT;
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else
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#endif /* !IPNOPRIVPORTS */
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req = KAUTH_REQ_NETWORK_BIND_PORT;
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error = kauth_authorize_network(cred, KAUTH_NETWORK_BIND, req,
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so, sin, NULL);
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if (error)
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return EACCES;
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#ifdef INET6
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in6_in_2_v4mapin6(&sin->sin_addr, &mapped);
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t6 = in6pcb_lookup_local(table, &mapped, sin->sin_port, wild, &vestige);
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if (t6 && (reuseport & t6->inp_socket->so_options) == 0)
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return EADDRINUSE;
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if (!t6 && vestige.valid) {
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if (!!reuseport != !!vestige.reuse_port) {
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return EADDRINUSE;
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}
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}
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#endif
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|
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/* XXX-kauth */
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if (so->so_uidinfo->ui_uid && !IN_MULTICAST(sin->sin_addr.s_addr)) {
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t = inpcb_lookup_local(table, sin->sin_addr, sin->sin_port, 1, &vestige);
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/*
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* XXX: investigate ramifications of loosening this
|
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* restriction so that as long as both ports have
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* SO_REUSEPORT allow the bind
|
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*/
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if (t &&
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(!in_nullhost(sin->sin_addr) ||
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!in_nullhost(in4p_laddr(t)) ||
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(t->inp_socket->so_options & SO_REUSEPORT) == 0)
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&& (so->so_uidinfo->ui_uid != t->inp_socket->so_uidinfo->ui_uid)) {
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return EADDRINUSE;
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}
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if (!t && vestige.valid) {
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if ((!in_nullhost(sin->sin_addr)
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|| !in_nullhost(vestige.laddr.v4)
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|| !vestige.reuse_port)
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&& so->so_uidinfo->ui_uid != vestige.uid) {
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return EADDRINUSE;
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}
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}
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}
|
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t = inpcb_lookup_local(table, sin->sin_addr, sin->sin_port, wild, &vestige);
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if (t && (reuseport & t->inp_socket->so_options) == 0)
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return EADDRINUSE;
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if (!t
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&& vestige.valid
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&& !(reuseport && vestige.reuse_port))
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return EADDRINUSE;
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|
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inp->inp_lport = sin->sin_port;
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inpcb_set_state(inp, INP_BOUND);
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}
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|
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LIST_REMOVE(inp, inp_lhash);
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|
LIST_INSERT_HEAD(INPCBHASH_PORT(table, inp->inp_lport), inp,
|
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inp_lhash);
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|
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return 0;
|
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}
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|
|
/*
|
|
* inpcb_bind: assign a local IP address and port number to the PCB.
|
|
*
|
|
* If the address is not a wildcard, verify that it corresponds to a
|
|
* local interface. If a port is specified and it is privileged, then
|
|
* check the permission. Check whether the address or port is in use,
|
|
* and if so, whether we can re-use them.
|
|
*/
|
|
int
|
|
inpcb_bind(void *v, struct sockaddr_in *sin, struct lwp *l)
|
|
{
|
|
struct inpcb *inp = v;
|
|
struct sockaddr_in lsin;
|
|
int error;
|
|
|
|
if (inp->inp_af != AF_INET)
|
|
return EINVAL;
|
|
|
|
if (inp->inp_lport || !in_nullhost(in4p_laddr(inp)))
|
|
return EINVAL;
|
|
|
|
if (NULL != sin) {
|
|
if (sin->sin_len != sizeof(*sin))
|
|
return EINVAL;
|
|
} else {
|
|
lsin = *((const struct sockaddr_in *)
|
|
inp->inp_socket->so_proto->pr_domain->dom_sa_any);
|
|
sin = &lsin;
|
|
}
|
|
|
|
/* Bind address. */
|
|
error = inpcb_bind_addr(inp, sin, l->l_cred);
|
|
if (error)
|
|
return error;
|
|
|
|
/* Bind port. */
|
|
error = inpcb_bind_port(inp, sin, l->l_cred);
|
|
if (error) {
|
|
in4p_laddr(inp).s_addr = INADDR_ANY;
|
|
|
|
return error;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* inpcb_connect: connect from a socket to a specified address, i.e.,
|
|
* assign a foreign IP address and port number to the PCB.
|
|
*
|
|
* Both address and port must be specified in the name argument.
|
|
* If there is no local address for this socket yet, then pick one.
|
|
*/
|
|
int
|
|
inpcb_connect(void *v, struct sockaddr_in *sin, struct lwp *l)
|
|
{
|
|
struct inpcb *inp = v;
|
|
vestigial_inpcb_t vestige;
|
|
int error;
|
|
struct in_addr laddr;
|
|
|
|
if (inp->inp_af != AF_INET)
|
|
return EINVAL;
|
|
|
|
if (sin->sin_len != sizeof (*sin))
|
|
return EINVAL;
|
|
if (sin->sin_family != AF_INET)
|
|
return EAFNOSUPPORT;
|
|
if (sin->sin_port == 0)
|
|
return EADDRNOTAVAIL;
|
|
|
|
if (IN_MULTICAST(sin->sin_addr.s_addr) &&
|
|
inp->inp_socket->so_type == SOCK_STREAM)
|
|
return EADDRNOTAVAIL;
|
|
|
|
if (!IN_ADDRLIST_READER_EMPTY()) {
|
|
/*
|
|
* If the destination address is INADDR_ANY,
|
|
* use any local address (likely loopback).
|
|
* If the supplied address is INADDR_BROADCAST,
|
|
* use the broadcast address of an interface
|
|
* which supports broadcast. (loopback does not)
|
|
*/
|
|
|
|
if (in_nullhost(sin->sin_addr)) {
|
|
/* XXX racy */
|
|
sin->sin_addr =
|
|
IN_ADDRLIST_READER_FIRST()->ia_addr.sin_addr;
|
|
} else if (sin->sin_addr.s_addr == INADDR_BROADCAST) {
|
|
struct in_ifaddr *ia;
|
|
int s = pserialize_read_enter();
|
|
IN_ADDRLIST_READER_FOREACH(ia) {
|
|
if (ia->ia_ifp->if_flags & IFF_BROADCAST) {
|
|
sin->sin_addr =
|
|
ia->ia_broadaddr.sin_addr;
|
|
break;
|
|
}
|
|
}
|
|
pserialize_read_exit(s);
|
|
}
|
|
}
|
|
/*
|
|
* If we haven't bound which network number to use as ours,
|
|
* we will use the number of the outgoing interface.
|
|
* This depends on having done a routing lookup, which
|
|
* we will probably have to do anyway, so we might
|
|
* as well do it now. On the other hand if we are
|
|
* sending to multiple destinations we may have already
|
|
* done the lookup, so see if we can use the route
|
|
* from before. In any case, we only
|
|
* chose a port number once, even if sending to multiple
|
|
* destinations.
|
|
*/
|
|
if (in_nullhost(in4p_laddr(inp))) {
|
|
int xerror;
|
|
struct in_ifaddr *ia, *_ia;
|
|
int s;
|
|
struct psref psref;
|
|
int bound;
|
|
|
|
bound = curlwp_bind();
|
|
ia = in_selectsrc(sin, &inp->inp_route,
|
|
inp->inp_socket->so_options, inp->inp_moptions, &xerror,
|
|
&psref);
|
|
if (ia == NULL) {
|
|
curlwp_bindx(bound);
|
|
if (xerror == 0)
|
|
xerror = EADDRNOTAVAIL;
|
|
return xerror;
|
|
}
|
|
s = pserialize_read_enter();
|
|
_ia = in_get_ia(IA_SIN(ia)->sin_addr);
|
|
if (_ia == NULL && (inp->inp_flags & INP_BINDANY) == 0) {
|
|
pserialize_read_exit(s);
|
|
ia4_release(ia, &psref);
|
|
curlwp_bindx(bound);
|
|
return EADDRNOTAVAIL;
|
|
}
|
|
pserialize_read_exit(s);
|
|
laddr = IA_SIN(ia)->sin_addr;
|
|
ia4_release(ia, &psref);
|
|
curlwp_bindx(bound);
|
|
} else
|
|
laddr = in4p_laddr(inp);
|
|
if (inpcb_lookup(inp->inp_table, sin->sin_addr, sin->sin_port,
|
|
laddr, inp->inp_lport, &vestige) != NULL ||
|
|
vestige.valid) {
|
|
return EADDRINUSE;
|
|
}
|
|
if (in_nullhost(in4p_laddr(inp))) {
|
|
if (inp->inp_lport == 0) {
|
|
error = inpcb_bind(inp, NULL, l);
|
|
/*
|
|
* This used to ignore the return value
|
|
* completely, but we need to check for
|
|
* ephemeral port shortage.
|
|
* And attempts to request low ports if not root.
|
|
*/
|
|
if (error != 0)
|
|
return error;
|
|
}
|
|
in4p_laddr(inp) = laddr;
|
|
}
|
|
in4p_faddr(inp) = sin->sin_addr;
|
|
inp->inp_fport = sin->sin_port;
|
|
|
|
/* Late bind, if needed */
|
|
if (inp->inp_bindportonsend) {
|
|
struct sockaddr_in lsin = *((const struct sockaddr_in *)
|
|
inp->inp_socket->so_proto->pr_domain->dom_sa_any);
|
|
lsin.sin_addr = in4p_laddr(inp);
|
|
lsin.sin_port = 0;
|
|
|
|
if ((error = inpcb_bind_port(inp, &lsin, l->l_cred)) != 0)
|
|
return error;
|
|
}
|
|
|
|
inpcb_set_state(inp, INP_CONNECTED);
|
|
#if defined(IPSEC)
|
|
if (ipsec_enabled && inp->inp_socket->so_type == SOCK_STREAM)
|
|
ipsec_pcbconn(inp->inp_sp);
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* inpcb_disconnect: remove any foreign IP/port association.
|
|
*
|
|
* Note: destroys the PCB if socket was closed.
|
|
*/
|
|
void
|
|
inpcb_disconnect(void *v)
|
|
{
|
|
struct inpcb *inp = v;
|
|
|
|
if (inp->inp_af != AF_INET)
|
|
return;
|
|
|
|
in4p_faddr(inp) = zeroin_addr;
|
|
inp->inp_fport = 0;
|
|
inpcb_set_state(inp, INP_BOUND);
|
|
#if defined(IPSEC)
|
|
if (ipsec_enabled)
|
|
ipsec_pcbdisconn(inp->inp_sp);
|
|
#endif
|
|
if (inp->inp_socket->so_state & SS_NOFDREF)
|
|
inpcb_destroy(inp);
|
|
}
|
|
|
|
/*
|
|
* inpcb_destroy: destroy PCB as well as the associated socket.
|
|
*/
|
|
void
|
|
inpcb_destroy(void *v)
|
|
{
|
|
struct inpcb *inp = v;
|
|
struct socket *so = inp->inp_socket;
|
|
int s;
|
|
|
|
KASSERT(inp->inp_af == AF_INET || inp->inp_af == AF_INET6);
|
|
|
|
#if defined(IPSEC)
|
|
if (ipsec_enabled)
|
|
ipsec_delete_pcbpolicy(inp);
|
|
#endif
|
|
so->so_pcb = NULL;
|
|
|
|
s = splsoftnet();
|
|
inpcb_set_state(inp, INP_ATTACHED);
|
|
LIST_REMOVE(inp, inp_lhash);
|
|
TAILQ_REMOVE(&inp->inp_table->inpt_queue, inp, inp_queue);
|
|
splx(s);
|
|
|
|
if (inp->inp_options) {
|
|
m_free(inp->inp_options);
|
|
}
|
|
rtcache_free(&inp->inp_route);
|
|
ip_freemoptions(inp->inp_moptions);
|
|
#ifdef INET6
|
|
if (inp->inp_af == AF_INET6) {
|
|
if (in6p_outputopts(inp) != NULL) {
|
|
ip6_clearpktopts(in6p_outputopts(inp), -1);
|
|
free(in6p_outputopts(inp), M_IP6OPT);
|
|
}
|
|
ip6_freemoptions(in6p_moptions(inp));
|
|
}
|
|
#endif
|
|
sofree(so); /* drops the socket's lock */
|
|
|
|
#ifdef INET6
|
|
if (inp->inp_af == AF_INET)
|
|
pool_cache_put(in4pcb_pool_cache, inp);
|
|
else
|
|
pool_cache_put(in6pcb_pool_cache, inp);
|
|
#else
|
|
KASSERT(inp->inp_af == AF_INET);
|
|
pool_cache_put(in4pcb_pool_cache, inp);
|
|
#endif
|
|
mutex_enter(softnet_lock); /* reacquire the softnet_lock */
|
|
}
|
|
|
|
/*
|
|
* inpcb_fetch_sockaddr: fetch the local IP address and port number.
|
|
*/
|
|
void
|
|
inpcb_fetch_sockaddr(struct inpcb *inp, struct sockaddr_in *sin)
|
|
{
|
|
|
|
if (inp->inp_af != AF_INET)
|
|
return;
|
|
|
|
sockaddr_in_init(sin, &in4p_laddr(inp), inp->inp_lport);
|
|
}
|
|
|
|
/*
|
|
* inpcb_fetch_peeraddr: fetch the foreign IP address and port number.
|
|
*/
|
|
void
|
|
inpcb_fetch_peeraddr(struct inpcb *inp, struct sockaddr_in *sin)
|
|
{
|
|
|
|
if (inp->inp_af != AF_INET)
|
|
return;
|
|
|
|
sockaddr_in_init(sin, &in4p_faddr(inp), inp->inp_fport);
|
|
}
|
|
|
|
/*
|
|
* inpcb_notify: pass some notification to all connections of a protocol
|
|
* associated with destination address. The local address and/or port
|
|
* numbers may be specified to limit the search. The "usual action" will
|
|
* be taken, depending on the command.
|
|
*
|
|
* The caller must filter any commands that are not interesting (e.g.,
|
|
* no error in the map). Call the protocol specific routine (if any) to
|
|
* report any errors for each matching socket.
|
|
*
|
|
* Must be called at splsoftnet.
|
|
*/
|
|
int
|
|
inpcb_notify(struct inpcbtable *table, struct in_addr faddr, u_int fport_arg,
|
|
struct in_addr laddr, u_int lport_arg, int errno,
|
|
void (*notify)(struct inpcb *, int))
|
|
{
|
|
struct inpcbhead *head;
|
|
struct inpcb *inp;
|
|
in_port_t fport = fport_arg, lport = lport_arg;
|
|
int nmatch;
|
|
|
|
if (in_nullhost(faddr) || notify == NULL)
|
|
return 0;
|
|
|
|
nmatch = 0;
|
|
head = INPCBHASH_CONNECT(table, faddr, fport, laddr, lport);
|
|
LIST_FOREACH(inp, head, inp_hash) {
|
|
if (inp->inp_af != AF_INET)
|
|
continue;
|
|
|
|
if (in_hosteq(in4p_faddr(inp), faddr) &&
|
|
inp->inp_fport == fport &&
|
|
inp->inp_lport == lport &&
|
|
in_hosteq(in4p_laddr(inp), laddr)) {
|
|
(*notify)(inp, errno);
|
|
nmatch++;
|
|
}
|
|
}
|
|
return nmatch;
|
|
}
|
|
|
|
void
|
|
inpcb_notifyall(struct inpcbtable *table, struct in_addr faddr, int errno,
|
|
void (*notify)(struct inpcb *, int))
|
|
{
|
|
struct inpcb *inp;
|
|
|
|
if (in_nullhost(faddr) || notify == NULL)
|
|
return;
|
|
|
|
TAILQ_FOREACH(inp, &table->inpt_queue, inp_queue) {
|
|
if (inp->inp_af != AF_INET)
|
|
continue;
|
|
if (in_hosteq(in4p_faddr(inp), faddr))
|
|
(*notify)(inp, errno);
|
|
}
|
|
}
|
|
|
|
void
|
|
in_purgeifmcast(struct ip_moptions *imo, struct ifnet *ifp)
|
|
{
|
|
int i, gap;
|
|
|
|
/* The owner of imo should be protected by solock */
|
|
KASSERT(ifp != NULL);
|
|
|
|
if (imo == NULL)
|
|
return;
|
|
|
|
/*
|
|
* Unselect the outgoing interface if it is being
|
|
* detached.
|
|
*/
|
|
if (imo->imo_multicast_if_index == ifp->if_index)
|
|
imo->imo_multicast_if_index = 0;
|
|
|
|
/*
|
|
* Drop multicast group membership if we joined
|
|
* through the interface being detached.
|
|
*/
|
|
for (i = 0, gap = 0; i < imo->imo_num_memberships; i++) {
|
|
if (imo->imo_membership[i]->inm_ifp == ifp) {
|
|
in_delmulti(imo->imo_membership[i]);
|
|
gap++;
|
|
} else if (gap != 0)
|
|
imo->imo_membership[i - gap] = imo->imo_membership[i];
|
|
}
|
|
imo->imo_num_memberships -= gap;
|
|
}
|
|
|
|
void
|
|
inpcb_purgeif0(struct inpcbtable *table, struct ifnet *ifp)
|
|
{
|
|
struct inpcb *inp;
|
|
|
|
TAILQ_FOREACH(inp, &table->inpt_queue, inp_queue) {
|
|
bool need_unlock = false;
|
|
|
|
if (inp->inp_af != AF_INET)
|
|
continue;
|
|
|
|
/* The caller holds either one of inps' lock */
|
|
if (!inp_locked(inp)) {
|
|
inp_lock(inp);
|
|
need_unlock = true;
|
|
}
|
|
|
|
in_purgeifmcast(inp->inp_moptions, ifp);
|
|
|
|
if (need_unlock)
|
|
inp_unlock(inp);
|
|
}
|
|
}
|
|
|
|
void
|
|
inpcb_purgeif(struct inpcbtable *table, struct ifnet *ifp)
|
|
{
|
|
struct rtentry *rt;
|
|
struct inpcb *inp;
|
|
|
|
TAILQ_FOREACH(inp, &table->inpt_queue, inp_queue) {
|
|
if (inp->inp_af != AF_INET)
|
|
continue;
|
|
if ((rt = rtcache_validate(&inp->inp_route)) != NULL &&
|
|
rt->rt_ifp == ifp) {
|
|
rtcache_unref(rt, &inp->inp_route);
|
|
inpcb_rtchange(inp, 0);
|
|
} else
|
|
rtcache_unref(rt, &inp->inp_route);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* inpcb_losing: check for alternatives when higher level complains about
|
|
* service problems. For now, invalidate cached routing information.
|
|
* If the route was created dynamically (by a redirect), time to try a
|
|
* default gateway again.
|
|
*/
|
|
void
|
|
inpcb_losing(struct inpcb *inp)
|
|
{
|
|
struct rtentry *rt;
|
|
struct rt_addrinfo info;
|
|
|
|
if (inp->inp_af != AF_INET)
|
|
return;
|
|
|
|
if ((rt = rtcache_validate(&inp->inp_route)) == NULL)
|
|
return;
|
|
|
|
memset(&info, 0, sizeof(info));
|
|
info.rti_info[RTAX_DST] = rtcache_getdst(&inp->inp_route);
|
|
info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
|
|
info.rti_info[RTAX_NETMASK] = rt_mask(rt);
|
|
rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0);
|
|
if (rt->rt_flags & RTF_DYNAMIC) {
|
|
int error;
|
|
struct rtentry *nrt;
|
|
|
|
error = rtrequest(RTM_DELETE, rt_getkey(rt),
|
|
rt->rt_gateway, rt_mask(rt), rt->rt_flags, &nrt);
|
|
rtcache_unref(rt, &inp->inp_route);
|
|
if (error == 0) {
|
|
rt_newmsg_dynamic(RTM_DELETE, nrt);
|
|
rt_free(nrt);
|
|
}
|
|
} else
|
|
rtcache_unref(rt, &inp->inp_route);
|
|
/*
|
|
* A new route can be allocated
|
|
* the next time output is attempted.
|
|
*/
|
|
rtcache_free(&inp->inp_route);
|
|
}
|
|
|
|
/*
|
|
* inpcb_rtchange: after a routing change, flush old routing.
|
|
* A new route can be allocated the next time output is attempted.
|
|
*/
|
|
void
|
|
inpcb_rtchange(struct inpcb *inp, int errno)
|
|
{
|
|
|
|
if (inp->inp_af != AF_INET)
|
|
return;
|
|
|
|
rtcache_free(&inp->inp_route);
|
|
|
|
/* XXX SHOULD NOTIFY HIGHER-LEVEL PROTOCOLS */
|
|
}
|
|
|
|
/*
|
|
* inpcb_lookup_local: find a PCB by looking at the local port and matching
|
|
* the local address or resolving the wildcards. Primarily used to detect
|
|
* when the local address is already in use.
|
|
*/
|
|
struct inpcb *
|
|
inpcb_lookup_local(struct inpcbtable *table, struct in_addr laddr,
|
|
u_int lport_arg, int lookup_wildcard, vestigial_inpcb_t *vp)
|
|
{
|
|
struct inpcbhead *head;
|
|
struct inpcb *inp;
|
|
struct inpcb *match = NULL;
|
|
int matchwild = 3;
|
|
int wildcard;
|
|
in_port_t lport = lport_arg;
|
|
|
|
if (vp)
|
|
vp->valid = 0;
|
|
|
|
head = INPCBHASH_PORT(table, lport);
|
|
LIST_FOREACH(inp, head, inp_lhash) {
|
|
if (inp->inp_af != AF_INET)
|
|
continue;
|
|
if (inp->inp_lport != lport)
|
|
continue;
|
|
/*
|
|
* check if inp's faddr and laddr match with ours.
|
|
* our faddr is considered null.
|
|
* count the number of wildcard matches. (0 - 2)
|
|
*
|
|
* null null match
|
|
* A null wildcard match
|
|
* null B wildcard match
|
|
* A B non match
|
|
* A A match
|
|
*/
|
|
wildcard = 0;
|
|
if (!in_nullhost(in4p_faddr(inp)))
|
|
wildcard++;
|
|
if (in_nullhost(in4p_laddr(inp))) {
|
|
if (!in_nullhost(laddr))
|
|
wildcard++;
|
|
} else {
|
|
if (in_nullhost(laddr))
|
|
wildcard++;
|
|
else {
|
|
if (!in_hosteq(in4p_laddr(inp), laddr))
|
|
continue;
|
|
}
|
|
}
|
|
if (wildcard && !lookup_wildcard)
|
|
continue;
|
|
/*
|
|
* prefer an address with less wildcards.
|
|
*/
|
|
if (wildcard < matchwild) {
|
|
match = inp;
|
|
matchwild = wildcard;
|
|
if (matchwild == 0)
|
|
break;
|
|
}
|
|
}
|
|
if (match && matchwild == 0)
|
|
return match;
|
|
|
|
if (vp && table->vestige) {
|
|
void *state = (*table->vestige->init_ports4)(laddr, lport_arg, lookup_wildcard);
|
|
vestigial_inpcb_t better;
|
|
bool has_better = false;
|
|
|
|
while (table->vestige
|
|
&& (*table->vestige->next_port4)(state, vp)) {
|
|
|
|
if (vp->lport != lport)
|
|
continue;
|
|
wildcard = 0;
|
|
if (!in_nullhost(vp->faddr.v4))
|
|
wildcard++;
|
|
if (in_nullhost(vp->laddr.v4)) {
|
|
if (!in_nullhost(laddr))
|
|
wildcard++;
|
|
} else {
|
|
if (in_nullhost(laddr))
|
|
wildcard++;
|
|
else {
|
|
if (!in_hosteq(vp->laddr.v4, laddr))
|
|
continue;
|
|
}
|
|
}
|
|
if (wildcard && !lookup_wildcard)
|
|
continue;
|
|
if (wildcard < matchwild) {
|
|
better = *vp;
|
|
has_better = true;
|
|
|
|
matchwild = wildcard;
|
|
if (matchwild == 0)
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (has_better) {
|
|
*vp = better;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return match;
|
|
}
|
|
|
|
#ifdef DIAGNOSTIC
|
|
int inpcb_notifymiss = 0;
|
|
#endif
|
|
|
|
/*
|
|
* inpcb_lookup: perform a full 4-tuple PCB lookup.
|
|
*/
|
|
struct inpcb *
|
|
inpcb_lookup(struct inpcbtable *table,
|
|
struct in_addr faddr, u_int fport_arg,
|
|
struct in_addr laddr, u_int lport_arg,
|
|
vestigial_inpcb_t *vp)
|
|
{
|
|
struct inpcbhead *head;
|
|
struct inpcb *inp;
|
|
in_port_t fport = fport_arg, lport = lport_arg;
|
|
|
|
if (vp)
|
|
vp->valid = 0;
|
|
|
|
head = INPCBHASH_CONNECT(table, faddr, fport, laddr, lport);
|
|
LIST_FOREACH(inp, head, inp_hash) {
|
|
if (inp->inp_af != AF_INET)
|
|
continue;
|
|
|
|
if (in_hosteq(in4p_faddr(inp), faddr) &&
|
|
inp->inp_fport == fport &&
|
|
inp->inp_lport == lport &&
|
|
in_hosteq(in4p_laddr(inp), laddr))
|
|
goto out;
|
|
}
|
|
if (vp && table->vestige) {
|
|
if ((*table->vestige->lookup4)(faddr, fport_arg,
|
|
laddr, lport_arg, vp))
|
|
return 0;
|
|
}
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (inpcb_notifymiss) {
|
|
printf("inpcb_lookup: faddr=%08x fport=%d laddr=%08x lport=%d\n",
|
|
ntohl(faddr.s_addr), ntohs(fport),
|
|
ntohl(laddr.s_addr), ntohs(lport));
|
|
}
|
|
#endif
|
|
return 0;
|
|
|
|
out:
|
|
/* Move this PCB to the head of hash chain. */
|
|
if (inp != LIST_FIRST(head)) {
|
|
LIST_REMOVE(inp, inp_hash);
|
|
LIST_INSERT_HEAD(head, inp, inp_hash);
|
|
}
|
|
return inp;
|
|
}
|
|
|
|
/*
|
|
* inpcb_lookup_bound: find a PCB by looking at the local address and port.
|
|
* Primarily used to find the listening (i.e., already bound) socket.
|
|
*/
|
|
struct inpcb *
|
|
inpcb_lookup_bound(struct inpcbtable *table,
|
|
struct in_addr laddr, u_int lport_arg)
|
|
{
|
|
struct inpcbhead *head;
|
|
struct inpcb *inp;
|
|
in_port_t lport = lport_arg;
|
|
|
|
head = INPCBHASH_BIND(table, laddr, lport);
|
|
LIST_FOREACH(inp, head, inp_hash) {
|
|
if (inp->inp_af != AF_INET)
|
|
continue;
|
|
|
|
if (inp->inp_lport == lport &&
|
|
in_hosteq(in4p_laddr(inp), laddr))
|
|
goto out;
|
|
}
|
|
head = INPCBHASH_BIND(table, zeroin_addr, lport);
|
|
LIST_FOREACH(inp, head, inp_hash) {
|
|
if (inp->inp_af != AF_INET)
|
|
continue;
|
|
|
|
if (inp->inp_lport == lport &&
|
|
in_hosteq(in4p_laddr(inp), zeroin_addr))
|
|
goto out;
|
|
}
|
|
#ifdef DIAGNOSTIC
|
|
if (inpcb_notifymiss) {
|
|
printf("inpcb_lookup_bound: laddr=%08x lport=%d\n",
|
|
ntohl(laddr.s_addr), ntohs(lport));
|
|
}
|
|
#endif
|
|
return 0;
|
|
|
|
out:
|
|
/* Move this PCB to the head of hash chain. */
|
|
if (inp != LIST_FIRST(head)) {
|
|
LIST_REMOVE(inp, inp_hash);
|
|
LIST_INSERT_HEAD(head, inp, inp_hash);
|
|
}
|
|
return inp;
|
|
}
|
|
|
|
void
|
|
inpcb_set_state(struct inpcb *inp, int state)
|
|
{
|
|
|
|
#ifdef INET6
|
|
if (inp->inp_af == AF_INET6) {
|
|
in6pcb_set_state(inp, state);
|
|
return;
|
|
}
|
|
#else
|
|
if (inp->inp_af != AF_INET)
|
|
return;
|
|
#endif
|
|
|
|
if (inp->inp_state > INP_ATTACHED)
|
|
LIST_REMOVE(inp, inp_hash);
|
|
|
|
switch (state) {
|
|
case INP_BOUND:
|
|
LIST_INSERT_HEAD(INPCBHASH_BIND(inp->inp_table,
|
|
in4p_laddr(inp), inp->inp_lport), inp,
|
|
inp_hash);
|
|
break;
|
|
case INP_CONNECTED:
|
|
LIST_INSERT_HEAD(INPCBHASH_CONNECT(inp->inp_table,
|
|
in4p_faddr(inp), inp->inp_fport,
|
|
in4p_laddr(inp), inp->inp_lport), inp,
|
|
inp_hash);
|
|
break;
|
|
}
|
|
|
|
inp->inp_state = state;
|
|
}
|
|
|
|
struct rtentry *
|
|
inpcb_rtentry(struct inpcb *inp)
|
|
{
|
|
struct route *ro;
|
|
union {
|
|
struct sockaddr dst;
|
|
struct sockaddr_in dst4;
|
|
} u;
|
|
|
|
#ifdef INET6
|
|
if (inp->inp_af == AF_INET6)
|
|
return in6pcb_rtentry(inp);
|
|
#endif
|
|
if (inp->inp_af != AF_INET)
|
|
return NULL;
|
|
|
|
ro = &inp->inp_route;
|
|
|
|
sockaddr_in_init(&u.dst4, &in4p_faddr(inp), 0);
|
|
return rtcache_lookup(ro, &u.dst);
|
|
}
|
|
|
|
void
|
|
inpcb_rtentry_unref(struct rtentry *rt, struct inpcb *inp)
|
|
{
|
|
|
|
rtcache_unref(rt, &inp->inp_route);
|
|
}
|