Summary: * Refactor rt_addrmsg(): make V_rt_add_addr_allfibs decision locally. * Fix rt_routemsg() and multipath by accepting nexthop instead of interface pointer. * Refactor rtsock_routemsg(): avoid accessing rtentry fields directly. * Simplify in_addprefix() by moving prefix search to a separate function. Reviewers: #network Subscribers: imp, ae, bz Differential Revision: https://reviews.freebsd.org/D28011
1574 lines
39 KiB
C
1574 lines
39 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1982, 1986, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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* Copyright (C) 2001 WIDE Project. 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.c 8.4 (Berkeley) 1/9/95
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/eventhandler.h>
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#include <sys/systm.h>
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#include <sys/sockio.h>
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#include <sys/malloc.h>
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#include <sys/priv.h>
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#include <sys/socket.h>
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#include <sys/jail.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/proc.h>
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#include <sys/rmlock.h>
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#include <sys/sysctl.h>
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#include <sys/syslog.h>
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#include <sys/sx.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <net/if_arp.h>
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#include <net/if_dl.h>
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#include <net/if_llatbl.h>
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#include <net/if_types.h>
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#include <net/route.h>
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#include <net/vnet.h>
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#include <netinet/if_ether.h>
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#include <netinet/in.h>
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#include <netinet/in_var.h>
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#include <netinet/in_pcb.h>
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#include <netinet/ip_var.h>
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#include <netinet/ip_carp.h>
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#include <netinet/igmp_var.h>
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#include <netinet/udp.h>
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#include <netinet/udp_var.h>
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static int in_aifaddr_ioctl(u_long, caddr_t, struct ifnet *, struct thread *);
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static int in_difaddr_ioctl(u_long, caddr_t, struct ifnet *, struct thread *);
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static int in_gifaddr_ioctl(u_long, caddr_t, struct ifnet *, struct thread *);
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static void in_socktrim(struct sockaddr_in *);
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static void in_purgemaddrs(struct ifnet *);
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VNET_DEFINE_STATIC(int, nosameprefix);
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#define V_nosameprefix VNET(nosameprefix)
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SYSCTL_INT(_net_inet_ip, OID_AUTO, no_same_prefix, CTLFLAG_VNET | CTLFLAG_RW,
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&VNET_NAME(nosameprefix), 0,
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"Refuse to create same prefixes on different interfaces");
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VNET_DECLARE(struct inpcbinfo, ripcbinfo);
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#define V_ripcbinfo VNET(ripcbinfo)
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static struct sx in_control_sx;
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SX_SYSINIT(in_control_sx, &in_control_sx, "in_control");
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/*
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* Return 1 if an internet address is for a ``local'' host
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* (one to which we have a connection).
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*/
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int
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in_localaddr(struct in_addr in)
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{
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struct rm_priotracker in_ifa_tracker;
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u_long i = ntohl(in.s_addr);
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struct in_ifaddr *ia;
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IN_IFADDR_RLOCK(&in_ifa_tracker);
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CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
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if ((i & ia->ia_subnetmask) == ia->ia_subnet) {
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IN_IFADDR_RUNLOCK(&in_ifa_tracker);
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return (1);
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}
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}
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IN_IFADDR_RUNLOCK(&in_ifa_tracker);
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return (0);
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}
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/*
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* Return 1 if an internet address is for the local host and configured
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* on one of its interfaces.
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*/
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int
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in_localip(struct in_addr in)
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{
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struct rm_priotracker in_ifa_tracker;
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struct in_ifaddr *ia;
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IN_IFADDR_RLOCK(&in_ifa_tracker);
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LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash) {
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if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr) {
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IN_IFADDR_RUNLOCK(&in_ifa_tracker);
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return (1);
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}
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}
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IN_IFADDR_RUNLOCK(&in_ifa_tracker);
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return (0);
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}
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/*
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* Return 1 if an internet address is configured on an interface.
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*/
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int
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in_ifhasaddr(struct ifnet *ifp, struct in_addr in)
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{
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struct ifaddr *ifa;
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struct in_ifaddr *ia;
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NET_EPOCH_ASSERT();
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CK_STAILQ_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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ia = (struct in_ifaddr *)ifa;
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if (ia->ia_addr.sin_addr.s_addr == in.s_addr)
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return (1);
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}
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return (0);
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}
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/*
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* Return a reference to the interface address which is different to
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* the supplied one but with same IP address value.
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*/
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static struct in_ifaddr *
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in_localip_more(struct in_ifaddr *ia)
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{
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struct rm_priotracker in_ifa_tracker;
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in_addr_t in = IA_SIN(ia)->sin_addr.s_addr;
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struct in_ifaddr *it;
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IN_IFADDR_RLOCK(&in_ifa_tracker);
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LIST_FOREACH(it, INADDR_HASH(in), ia_hash) {
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if (it != ia && IA_SIN(it)->sin_addr.s_addr == in) {
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ifa_ref(&it->ia_ifa);
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IN_IFADDR_RUNLOCK(&in_ifa_tracker);
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return (it);
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}
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}
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IN_IFADDR_RUNLOCK(&in_ifa_tracker);
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return (NULL);
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}
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/*
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* Determine whether an IP address is in a reserved set of addresses
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* that may not be forwarded, or whether datagrams to that destination
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* may be forwarded.
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*/
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int
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in_canforward(struct in_addr in)
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{
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u_long i = ntohl(in.s_addr);
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if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i) || IN_LINKLOCAL(i) ||
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IN_ZERONET(i) || IN_LOOPBACK(i))
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return (0);
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return (1);
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}
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/*
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* Trim a mask in a sockaddr
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*/
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static void
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in_socktrim(struct sockaddr_in *ap)
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{
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char *cplim = (char *) &ap->sin_addr;
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char *cp = (char *) (&ap->sin_addr + 1);
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ap->sin_len = 0;
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while (--cp >= cplim)
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if (*cp) {
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(ap)->sin_len = cp - (char *) (ap) + 1;
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break;
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}
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}
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/*
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* Generic internet control operations (ioctl's).
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*/
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int
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in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
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struct thread *td)
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{
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struct ifreq *ifr = (struct ifreq *)data;
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struct sockaddr_in *addr = (struct sockaddr_in *)&ifr->ifr_addr;
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struct epoch_tracker et;
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struct ifaddr *ifa;
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struct in_ifaddr *ia;
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int error;
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if (ifp == NULL)
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return (EADDRNOTAVAIL);
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/*
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* Filter out 4 ioctls we implement directly. Forward the rest
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* to specific functions and ifp->if_ioctl().
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*/
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switch (cmd) {
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case SIOCGIFADDR:
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case SIOCGIFBRDADDR:
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case SIOCGIFDSTADDR:
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case SIOCGIFNETMASK:
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break;
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case SIOCGIFALIAS:
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sx_xlock(&in_control_sx);
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error = in_gifaddr_ioctl(cmd, data, ifp, td);
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sx_xunlock(&in_control_sx);
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return (error);
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case SIOCDIFADDR:
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sx_xlock(&in_control_sx);
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error = in_difaddr_ioctl(cmd, data, ifp, td);
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sx_xunlock(&in_control_sx);
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return (error);
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case OSIOCAIFADDR: /* 9.x compat */
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case SIOCAIFADDR:
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sx_xlock(&in_control_sx);
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error = in_aifaddr_ioctl(cmd, data, ifp, td);
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sx_xunlock(&in_control_sx);
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return (error);
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case SIOCSIFADDR:
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case SIOCSIFBRDADDR:
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case SIOCSIFDSTADDR:
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case SIOCSIFNETMASK:
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/* We no longer support that old commands. */
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return (EINVAL);
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default:
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if (ifp->if_ioctl == NULL)
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return (EOPNOTSUPP);
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return ((*ifp->if_ioctl)(ifp, cmd, data));
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}
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if (addr->sin_addr.s_addr != INADDR_ANY &&
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prison_check_ip4(td->td_ucred, &addr->sin_addr) != 0)
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return (EADDRNOTAVAIL);
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/*
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* Find address for this interface, if it exists. If an
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* address was specified, find that one instead of the
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* first one on the interface, if possible.
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*/
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NET_EPOCH_ENTER(et);
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CK_STAILQ_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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ia = (struct in_ifaddr *)ifa;
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if (ia->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr)
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break;
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}
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if (ifa == NULL)
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CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
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if (ifa->ifa_addr->sa_family == AF_INET) {
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ia = (struct in_ifaddr *)ifa;
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if (prison_check_ip4(td->td_ucred,
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&ia->ia_addr.sin_addr) == 0)
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break;
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}
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if (ifa == NULL) {
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NET_EPOCH_EXIT(et);
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return (EADDRNOTAVAIL);
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}
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error = 0;
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switch (cmd) {
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case SIOCGIFADDR:
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*addr = ia->ia_addr;
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break;
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case SIOCGIFBRDADDR:
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if ((ifp->if_flags & IFF_BROADCAST) == 0) {
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error = EINVAL;
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break;
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}
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*addr = ia->ia_broadaddr;
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break;
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case SIOCGIFDSTADDR:
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if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
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error = EINVAL;
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break;
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}
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*addr = ia->ia_dstaddr;
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break;
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case SIOCGIFNETMASK:
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*addr = ia->ia_sockmask;
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break;
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}
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NET_EPOCH_EXIT(et);
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return (error);
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}
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static int
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in_aifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td)
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{
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const struct in_aliasreq *ifra = (struct in_aliasreq *)data;
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const struct sockaddr_in *addr = &ifra->ifra_addr;
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const struct sockaddr_in *broadaddr = &ifra->ifra_broadaddr;
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const struct sockaddr_in *mask = &ifra->ifra_mask;
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const struct sockaddr_in *dstaddr = &ifra->ifra_dstaddr;
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const int vhid = (cmd == SIOCAIFADDR) ? ifra->ifra_vhid : 0;
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struct epoch_tracker et;
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struct ifaddr *ifa;
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struct in_ifaddr *ia;
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bool iaIsFirst;
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int error = 0;
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error = priv_check(td, PRIV_NET_ADDIFADDR);
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if (error)
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return (error);
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/*
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* ifra_addr must be present and be of INET family.
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* ifra_broadaddr/ifra_dstaddr and ifra_mask are optional.
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*/
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if (addr->sin_len != sizeof(struct sockaddr_in) ||
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addr->sin_family != AF_INET)
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return (EINVAL);
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if (broadaddr->sin_len != 0 &&
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(broadaddr->sin_len != sizeof(struct sockaddr_in) ||
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broadaddr->sin_family != AF_INET))
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return (EINVAL);
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if (mask->sin_len != 0 &&
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(mask->sin_len != sizeof(struct sockaddr_in) ||
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mask->sin_family != AF_INET))
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return (EINVAL);
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if ((ifp->if_flags & IFF_POINTOPOINT) &&
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(dstaddr->sin_len != sizeof(struct sockaddr_in) ||
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dstaddr->sin_addr.s_addr == INADDR_ANY))
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return (EDESTADDRREQ);
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if (vhid > 0 && carp_attach_p == NULL)
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return (EPROTONOSUPPORT);
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/*
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* See whether address already exist.
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*/
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iaIsFirst = true;
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ia = NULL;
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NET_EPOCH_ENTER(et);
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CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
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struct in_ifaddr *it;
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if (ifa->ifa_addr->sa_family != AF_INET)
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continue;
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it = (struct in_ifaddr *)ifa;
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if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
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prison_check_ip4(td->td_ucred, &addr->sin_addr) == 0)
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ia = it;
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else
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iaIsFirst = false;
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}
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NET_EPOCH_EXIT(et);
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if (ia != NULL)
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(void )in_difaddr_ioctl(cmd, data, ifp, td);
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ifa = ifa_alloc(sizeof(struct in_ifaddr), M_WAITOK);
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ia = (struct in_ifaddr *)ifa;
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ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr;
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ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
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ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask;
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callout_init_rw(&ia->ia_garp_timer, &ifp->if_addr_lock,
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CALLOUT_RETURNUNLOCKED);
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ia->ia_ifp = ifp;
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ia->ia_addr = *addr;
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if (mask->sin_len != 0) {
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ia->ia_sockmask = *mask;
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ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr);
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} else {
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in_addr_t i = ntohl(addr->sin_addr.s_addr);
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|
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/*
|
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* Be compatible with network classes, if netmask isn't
|
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* supplied, guess it based on classes.
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*/
|
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if (IN_CLASSA(i))
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ia->ia_subnetmask = IN_CLASSA_NET;
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else if (IN_CLASSB(i))
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ia->ia_subnetmask = IN_CLASSB_NET;
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else
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ia->ia_subnetmask = IN_CLASSC_NET;
|
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ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
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}
|
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ia->ia_subnet = ntohl(addr->sin_addr.s_addr) & ia->ia_subnetmask;
|
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in_socktrim(&ia->ia_sockmask);
|
|
|
|
if (ifp->if_flags & IFF_BROADCAST) {
|
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if (broadaddr->sin_len != 0) {
|
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ia->ia_broadaddr = *broadaddr;
|
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} else if (ia->ia_subnetmask == IN_RFC3021_MASK) {
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ia->ia_broadaddr.sin_addr.s_addr = INADDR_BROADCAST;
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ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in);
|
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ia->ia_broadaddr.sin_family = AF_INET;
|
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} else {
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ia->ia_broadaddr.sin_addr.s_addr =
|
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htonl(ia->ia_subnet | ~ia->ia_subnetmask);
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ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in);
|
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ia->ia_broadaddr.sin_family = AF_INET;
|
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}
|
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}
|
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|
|
if (ifp->if_flags & IFF_POINTOPOINT)
|
|
ia->ia_dstaddr = *dstaddr;
|
|
|
|
/* XXXGL: rtinit() needs this strange assignment. */
|
|
if (ifp->if_flags & IFF_LOOPBACK)
|
|
ia->ia_dstaddr = ia->ia_addr;
|
|
|
|
if (vhid != 0) {
|
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error = (*carp_attach_p)(&ia->ia_ifa, vhid);
|
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if (error)
|
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return (error);
|
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}
|
|
|
|
/* if_addrhead is already referenced by ifa_alloc() */
|
|
IF_ADDR_WLOCK(ifp);
|
|
CK_STAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link);
|
|
IF_ADDR_WUNLOCK(ifp);
|
|
|
|
ifa_ref(ifa); /* in_ifaddrhead */
|
|
IN_IFADDR_WLOCK();
|
|
CK_STAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link);
|
|
LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), ia, ia_hash);
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IN_IFADDR_WUNLOCK();
|
|
|
|
/*
|
|
* Give the interface a chance to initialize
|
|
* if this is its first address,
|
|
* and to validate the address if necessary.
|
|
*/
|
|
if (ifp->if_ioctl != NULL) {
|
|
error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
|
|
if (error)
|
|
goto fail1;
|
|
}
|
|
|
|
/*
|
|
* Add route for the network.
|
|
*/
|
|
if (vhid == 0) {
|
|
int flags = RTF_UP;
|
|
|
|
if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT))
|
|
flags |= RTF_HOST;
|
|
|
|
error = in_addprefix(ia, flags);
|
|
if (error)
|
|
goto fail1;
|
|
}
|
|
|
|
/*
|
|
* Add a loopback route to self.
|
|
*/
|
|
if (vhid == 0 && (ifp->if_flags & IFF_LOOPBACK) == 0 &&
|
|
ia->ia_addr.sin_addr.s_addr != INADDR_ANY &&
|
|
!((ifp->if_flags & IFF_POINTOPOINT) &&
|
|
ia->ia_dstaddr.sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr)) {
|
|
struct in_ifaddr *eia;
|
|
|
|
eia = in_localip_more(ia);
|
|
|
|
if (eia == NULL) {
|
|
error = ifa_add_loopback_route((struct ifaddr *)ia,
|
|
(struct sockaddr *)&ia->ia_addr);
|
|
if (error)
|
|
goto fail2;
|
|
} else
|
|
ifa_free(&eia->ia_ifa);
|
|
}
|
|
|
|
if (iaIsFirst && (ifp->if_flags & IFF_MULTICAST)) {
|
|
struct in_addr allhosts_addr;
|
|
struct in_ifinfo *ii;
|
|
|
|
ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
|
|
allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
|
|
|
|
error = in_joingroup(ifp, &allhosts_addr, NULL,
|
|
&ii->ii_allhosts);
|
|
}
|
|
|
|
/*
|
|
* Note: we don't need extra reference for ifa, since we called
|
|
* with sx lock held, and ifaddr can not be deleted in concurrent
|
|
* thread.
|
|
*/
|
|
EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, ifa, IFADDR_EVENT_ADD);
|
|
|
|
return (error);
|
|
|
|
fail2:
|
|
if (vhid == 0)
|
|
(void )in_scrubprefix(ia, LLE_STATIC);
|
|
|
|
fail1:
|
|
if (ia->ia_ifa.ifa_carp)
|
|
(*carp_detach_p)(&ia->ia_ifa, false);
|
|
|
|
IF_ADDR_WLOCK(ifp);
|
|
CK_STAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifaddr, ifa_link);
|
|
IF_ADDR_WUNLOCK(ifp);
|
|
ifa_free(&ia->ia_ifa); /* if_addrhead */
|
|
|
|
IN_IFADDR_WLOCK();
|
|
CK_STAILQ_REMOVE(&V_in_ifaddrhead, ia, in_ifaddr, ia_link);
|
|
LIST_REMOVE(ia, ia_hash);
|
|
IN_IFADDR_WUNLOCK();
|
|
ifa_free(&ia->ia_ifa); /* in_ifaddrhead */
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
in_difaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td)
|
|
{
|
|
const struct ifreq *ifr = (struct ifreq *)data;
|
|
const struct sockaddr_in *addr = (const struct sockaddr_in *)
|
|
&ifr->ifr_addr;
|
|
struct ifaddr *ifa;
|
|
struct in_ifaddr *ia;
|
|
bool deleteAny, iaIsLast;
|
|
int error;
|
|
|
|
if (td != NULL) {
|
|
error = priv_check(td, PRIV_NET_DELIFADDR);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
|
|
if (addr->sin_len != sizeof(struct sockaddr_in) ||
|
|
addr->sin_family != AF_INET)
|
|
deleteAny = true;
|
|
else
|
|
deleteAny = false;
|
|
|
|
iaIsLast = true;
|
|
ia = NULL;
|
|
IF_ADDR_WLOCK(ifp);
|
|
CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
|
|
struct in_ifaddr *it;
|
|
|
|
if (ifa->ifa_addr->sa_family != AF_INET)
|
|
continue;
|
|
|
|
it = (struct in_ifaddr *)ifa;
|
|
if (deleteAny && ia == NULL && (td == NULL ||
|
|
prison_check_ip4(td->td_ucred, &it->ia_addr.sin_addr) == 0))
|
|
ia = it;
|
|
|
|
if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
|
|
(td == NULL || prison_check_ip4(td->td_ucred,
|
|
&addr->sin_addr) == 0))
|
|
ia = it;
|
|
|
|
if (it != ia)
|
|
iaIsLast = false;
|
|
}
|
|
|
|
if (ia == NULL) {
|
|
IF_ADDR_WUNLOCK(ifp);
|
|
return (EADDRNOTAVAIL);
|
|
}
|
|
|
|
CK_STAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifaddr, ifa_link);
|
|
IF_ADDR_WUNLOCK(ifp);
|
|
ifa_free(&ia->ia_ifa); /* if_addrhead */
|
|
|
|
IN_IFADDR_WLOCK();
|
|
CK_STAILQ_REMOVE(&V_in_ifaddrhead, ia, in_ifaddr, ia_link);
|
|
LIST_REMOVE(ia, ia_hash);
|
|
IN_IFADDR_WUNLOCK();
|
|
|
|
/*
|
|
* in_scrubprefix() kills the interface route.
|
|
*/
|
|
in_scrubprefix(ia, LLE_STATIC);
|
|
|
|
/*
|
|
* in_ifadown gets rid of all the rest of
|
|
* the routes. This is not quite the right
|
|
* thing to do, but at least if we are running
|
|
* a routing process they will come back.
|
|
*/
|
|
in_ifadown(&ia->ia_ifa, 1);
|
|
|
|
if (ia->ia_ifa.ifa_carp)
|
|
(*carp_detach_p)(&ia->ia_ifa, cmd == SIOCAIFADDR);
|
|
|
|
/*
|
|
* If this is the last IPv4 address configured on this
|
|
* interface, leave the all-hosts group.
|
|
* No state-change report need be transmitted.
|
|
*/
|
|
if (iaIsLast && (ifp->if_flags & IFF_MULTICAST)) {
|
|
struct in_ifinfo *ii;
|
|
|
|
ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
|
|
if (ii->ii_allhosts) {
|
|
(void)in_leavegroup(ii->ii_allhosts, NULL);
|
|
ii->ii_allhosts = NULL;
|
|
}
|
|
}
|
|
|
|
IF_ADDR_WLOCK(ifp);
|
|
if (callout_stop(&ia->ia_garp_timer) == 1) {
|
|
ifa_free(&ia->ia_ifa);
|
|
}
|
|
IF_ADDR_WUNLOCK(ifp);
|
|
|
|
EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, &ia->ia_ifa,
|
|
IFADDR_EVENT_DEL);
|
|
ifa_free(&ia->ia_ifa); /* in_ifaddrhead */
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
in_gifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td)
|
|
{
|
|
struct in_aliasreq *ifra = (struct in_aliasreq *)data;
|
|
const struct sockaddr_in *addr = &ifra->ifra_addr;
|
|
struct epoch_tracker et;
|
|
struct ifaddr *ifa;
|
|
struct in_ifaddr *ia;
|
|
|
|
/*
|
|
* ifra_addr must be present and be of INET family.
|
|
*/
|
|
if (addr->sin_len != sizeof(struct sockaddr_in) ||
|
|
addr->sin_family != AF_INET)
|
|
return (EINVAL);
|
|
|
|
/*
|
|
* See whether address exist.
|
|
*/
|
|
ia = NULL;
|
|
NET_EPOCH_ENTER(et);
|
|
CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
|
|
struct in_ifaddr *it;
|
|
|
|
if (ifa->ifa_addr->sa_family != AF_INET)
|
|
continue;
|
|
|
|
it = (struct in_ifaddr *)ifa;
|
|
if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
|
|
prison_check_ip4(td->td_ucred, &addr->sin_addr) == 0) {
|
|
ia = it;
|
|
break;
|
|
}
|
|
}
|
|
if (ia == NULL) {
|
|
NET_EPOCH_EXIT(et);
|
|
return (EADDRNOTAVAIL);
|
|
}
|
|
|
|
ifra->ifra_mask = ia->ia_sockmask;
|
|
if ((ifp->if_flags & IFF_POINTOPOINT) &&
|
|
ia->ia_dstaddr.sin_family == AF_INET)
|
|
ifra->ifra_dstaddr = ia->ia_dstaddr;
|
|
else if ((ifp->if_flags & IFF_BROADCAST) &&
|
|
ia->ia_broadaddr.sin_family == AF_INET)
|
|
ifra->ifra_broadaddr = ia->ia_broadaddr;
|
|
else
|
|
memset(&ifra->ifra_broadaddr, 0,
|
|
sizeof(ifra->ifra_broadaddr));
|
|
|
|
NET_EPOCH_EXIT(et);
|
|
return (0);
|
|
}
|
|
|
|
#define rtinitflags(x) \
|
|
((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \
|
|
? RTF_HOST : 0)
|
|
|
|
/*
|
|
* Check if we have a route for the given prefix already.
|
|
*/
|
|
static bool
|
|
in_hasrtprefix(struct in_ifaddr *target, int flags)
|
|
{
|
|
struct rm_priotracker in_ifa_tracker;
|
|
struct in_ifaddr *ia;
|
|
struct in_addr prefix, mask, p, m;
|
|
bool result = false;
|
|
|
|
if ((flags & RTF_HOST) != 0) {
|
|
prefix = target->ia_dstaddr.sin_addr;
|
|
mask.s_addr = 0;
|
|
} else {
|
|
prefix = target->ia_addr.sin_addr;
|
|
mask = target->ia_sockmask.sin_addr;
|
|
prefix.s_addr &= mask.s_addr;
|
|
}
|
|
|
|
IN_IFADDR_RLOCK(&in_ifa_tracker);
|
|
/* Look for an existing address with the same prefix, mask, and fib */
|
|
CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
|
|
if (rtinitflags(ia)) {
|
|
p = ia->ia_dstaddr.sin_addr;
|
|
|
|
if (prefix.s_addr != p.s_addr)
|
|
continue;
|
|
} else {
|
|
p = ia->ia_addr.sin_addr;
|
|
m = ia->ia_sockmask.sin_addr;
|
|
p.s_addr &= m.s_addr;
|
|
|
|
if (prefix.s_addr != p.s_addr ||
|
|
mask.s_addr != m.s_addr)
|
|
continue;
|
|
}
|
|
if (target->ia_ifp->if_fib != ia->ia_ifp->if_fib)
|
|
continue;
|
|
|
|
/*
|
|
* If we got a matching prefix route inserted by other
|
|
* interface address, we are done here.
|
|
*/
|
|
if (ia->ia_flags & IFA_ROUTE) {
|
|
result = true;
|
|
break;
|
|
}
|
|
}
|
|
IN_IFADDR_RUNLOCK(&in_ifa_tracker);
|
|
|
|
return (result);
|
|
}
|
|
|
|
int
|
|
in_addprefix(struct in_ifaddr *target, int flags)
|
|
{
|
|
int error;
|
|
|
|
if (in_hasrtprefix(target, flags)) {
|
|
if (V_nosameprefix)
|
|
return (EEXIST);
|
|
else {
|
|
rt_addrmsg(RTM_ADD, &target->ia_ifa,
|
|
target->ia_ifp->if_fib);
|
|
return (0);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* No-one seem to have this prefix route, so we try to insert it.
|
|
*/
|
|
error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags);
|
|
if (!error)
|
|
target->ia_flags |= IFA_ROUTE;
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Removes either all lle entries for given @ia, or lle
|
|
* corresponding to @ia address.
|
|
*/
|
|
static void
|
|
in_scrubprefixlle(struct in_ifaddr *ia, int all, u_int flags)
|
|
{
|
|
struct sockaddr_in addr, mask;
|
|
struct sockaddr *saddr, *smask;
|
|
struct ifnet *ifp;
|
|
|
|
saddr = (struct sockaddr *)&addr;
|
|
bzero(&addr, sizeof(addr));
|
|
addr.sin_len = sizeof(addr);
|
|
addr.sin_family = AF_INET;
|
|
smask = (struct sockaddr *)&mask;
|
|
bzero(&mask, sizeof(mask));
|
|
mask.sin_len = sizeof(mask);
|
|
mask.sin_family = AF_INET;
|
|
mask.sin_addr.s_addr = ia->ia_subnetmask;
|
|
ifp = ia->ia_ifp;
|
|
|
|
if (all) {
|
|
/*
|
|
* Remove all L2 entries matching given prefix.
|
|
* Convert address to host representation to avoid
|
|
* doing this on every callback. ia_subnetmask is already
|
|
* stored in host representation.
|
|
*/
|
|
addr.sin_addr.s_addr = ntohl(ia->ia_addr.sin_addr.s_addr);
|
|
lltable_prefix_free(AF_INET, saddr, smask, flags);
|
|
} else {
|
|
/* Remove interface address only */
|
|
addr.sin_addr.s_addr = ia->ia_addr.sin_addr.s_addr;
|
|
lltable_delete_addr(LLTABLE(ifp), LLE_IFADDR, saddr);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If there is no other address in the system that can serve a route to the
|
|
* same prefix, remove the route. Hand over the route to the new address
|
|
* otherwise.
|
|
*/
|
|
int
|
|
in_scrubprefix(struct in_ifaddr *target, u_int flags)
|
|
{
|
|
struct rm_priotracker in_ifa_tracker;
|
|
struct in_ifaddr *ia;
|
|
struct in_addr prefix, mask, p, m;
|
|
int error = 0;
|
|
|
|
/*
|
|
* Remove the loopback route to the interface address.
|
|
*/
|
|
if ((target->ia_addr.sin_addr.s_addr != INADDR_ANY) &&
|
|
!(target->ia_ifp->if_flags & IFF_LOOPBACK) &&
|
|
(flags & LLE_STATIC)) {
|
|
struct in_ifaddr *eia;
|
|
|
|
/*
|
|
* XXXME: add fib-aware in_localip.
|
|
* We definitely don't want to switch between
|
|
* prefixes in different fibs.
|
|
*/
|
|
eia = in_localip_more(target);
|
|
|
|
if (eia != NULL) {
|
|
error = ifa_switch_loopback_route((struct ifaddr *)eia,
|
|
(struct sockaddr *)&target->ia_addr);
|
|
ifa_free(&eia->ia_ifa);
|
|
} else {
|
|
error = ifa_del_loopback_route((struct ifaddr *)target,
|
|
(struct sockaddr *)&target->ia_addr);
|
|
}
|
|
}
|
|
|
|
if (rtinitflags(target)) {
|
|
prefix = target->ia_dstaddr.sin_addr;
|
|
mask.s_addr = 0;
|
|
} else {
|
|
prefix = target->ia_addr.sin_addr;
|
|
mask = target->ia_sockmask.sin_addr;
|
|
prefix.s_addr &= mask.s_addr;
|
|
}
|
|
|
|
if ((target->ia_flags & IFA_ROUTE) == 0) {
|
|
rt_addrmsg(RTM_DELETE, &target->ia_ifa, target->ia_ifp->if_fib);
|
|
|
|
/*
|
|
* Removing address from !IFF_UP interface or
|
|
* prefix which exists on other interface (along with route).
|
|
* No entries should exist here except target addr.
|
|
* Given that, delete this entry only.
|
|
*/
|
|
in_scrubprefixlle(target, 0, flags);
|
|
return (0);
|
|
}
|
|
|
|
IN_IFADDR_RLOCK(&in_ifa_tracker);
|
|
CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
|
|
if (rtinitflags(ia)) {
|
|
p = ia->ia_dstaddr.sin_addr;
|
|
|
|
if (prefix.s_addr != p.s_addr)
|
|
continue;
|
|
} else {
|
|
p = ia->ia_addr.sin_addr;
|
|
m = ia->ia_sockmask.sin_addr;
|
|
p.s_addr &= m.s_addr;
|
|
|
|
if (prefix.s_addr != p.s_addr ||
|
|
mask.s_addr != m.s_addr)
|
|
continue;
|
|
}
|
|
|
|
if ((ia->ia_ifp->if_flags & IFF_UP) == 0)
|
|
continue;
|
|
|
|
/*
|
|
* If we got a matching prefix address, move IFA_ROUTE and
|
|
* the route itself to it. Make sure that routing daemons
|
|
* get a heads-up.
|
|
*/
|
|
if ((ia->ia_flags & IFA_ROUTE) == 0) {
|
|
ifa_ref(&ia->ia_ifa);
|
|
IN_IFADDR_RUNLOCK(&in_ifa_tracker);
|
|
error = rtinit(&(target->ia_ifa), (int)RTM_DELETE,
|
|
rtinitflags(target));
|
|
if (error == 0)
|
|
target->ia_flags &= ~IFA_ROUTE;
|
|
else
|
|
log(LOG_INFO, "in_scrubprefix: err=%d, old prefix delete failed\n",
|
|
error);
|
|
/* Scrub all entries IFF interface is different */
|
|
in_scrubprefixlle(target, target->ia_ifp != ia->ia_ifp,
|
|
flags);
|
|
error = rtinit(&ia->ia_ifa, (int)RTM_ADD,
|
|
rtinitflags(ia) | RTF_UP);
|
|
if (error == 0)
|
|
ia->ia_flags |= IFA_ROUTE;
|
|
else
|
|
log(LOG_INFO, "in_scrubprefix: err=%d, new prefix add failed\n",
|
|
error);
|
|
ifa_free(&ia->ia_ifa);
|
|
return (error);
|
|
}
|
|
}
|
|
IN_IFADDR_RUNLOCK(&in_ifa_tracker);
|
|
|
|
/*
|
|
* remove all L2 entries on the given prefix
|
|
*/
|
|
in_scrubprefixlle(target, 1, flags);
|
|
|
|
/*
|
|
* As no-one seem to have this prefix, we can remove the route.
|
|
*/
|
|
error = rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target));
|
|
if (error == 0)
|
|
target->ia_flags &= ~IFA_ROUTE;
|
|
else
|
|
log(LOG_INFO, "in_scrubprefix: err=%d, prefix delete failed\n", error);
|
|
return (error);
|
|
}
|
|
|
|
#undef rtinitflags
|
|
|
|
void
|
|
in_ifscrub_all(void)
|
|
{
|
|
struct ifnet *ifp;
|
|
struct ifaddr *ifa, *nifa;
|
|
struct ifaliasreq ifr;
|
|
|
|
IFNET_RLOCK();
|
|
CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
|
|
/* Cannot lock here - lock recursion. */
|
|
/* NET_EPOCH_ENTER(et); */
|
|
CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) {
|
|
if (ifa->ifa_addr->sa_family != AF_INET)
|
|
continue;
|
|
|
|
/*
|
|
* This is ugly but the only way for legacy IP to
|
|
* cleanly remove addresses and everything attached.
|
|
*/
|
|
bzero(&ifr, sizeof(ifr));
|
|
ifr.ifra_addr = *ifa->ifa_addr;
|
|
if (ifa->ifa_dstaddr)
|
|
ifr.ifra_broadaddr = *ifa->ifa_dstaddr;
|
|
(void)in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr,
|
|
ifp, NULL);
|
|
}
|
|
/* NET_EPOCH_EXIT(et); */
|
|
in_purgemaddrs(ifp);
|
|
igmp_domifdetach(ifp);
|
|
}
|
|
IFNET_RUNLOCK();
|
|
}
|
|
|
|
int
|
|
in_ifaddr_broadcast(struct in_addr in, struct in_ifaddr *ia)
|
|
{
|
|
|
|
return ((in.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
|
|
/*
|
|
* Check for old-style (host 0) broadcast, but
|
|
* taking into account that RFC 3021 obsoletes it.
|
|
*/
|
|
(ia->ia_subnetmask != IN_RFC3021_MASK &&
|
|
ntohl(in.s_addr) == ia->ia_subnet)) &&
|
|
/*
|
|
* Check for an all one subnetmask. These
|
|
* only exist when an interface gets a secondary
|
|
* address.
|
|
*/
|
|
ia->ia_subnetmask != (u_long)0xffffffff);
|
|
}
|
|
|
|
/*
|
|
* Return 1 if the address might be a local broadcast address.
|
|
*/
|
|
int
|
|
in_broadcast(struct in_addr in, struct ifnet *ifp)
|
|
{
|
|
struct ifaddr *ifa;
|
|
int found;
|
|
|
|
NET_EPOCH_ASSERT();
|
|
|
|
if (in.s_addr == INADDR_BROADCAST ||
|
|
in.s_addr == INADDR_ANY)
|
|
return (1);
|
|
if ((ifp->if_flags & IFF_BROADCAST) == 0)
|
|
return (0);
|
|
found = 0;
|
|
/*
|
|
* Look through the list of addresses for a match
|
|
* with a broadcast address.
|
|
*/
|
|
CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
|
|
if (ifa->ifa_addr->sa_family == AF_INET &&
|
|
in_ifaddr_broadcast(in, (struct in_ifaddr *)ifa)) {
|
|
found = 1;
|
|
break;
|
|
}
|
|
return (found);
|
|
}
|
|
|
|
/*
|
|
* On interface removal, clean up IPv4 data structures hung off of the ifnet.
|
|
*/
|
|
void
|
|
in_ifdetach(struct ifnet *ifp)
|
|
{
|
|
IN_MULTI_LOCK();
|
|
in_pcbpurgeif0(&V_ripcbinfo, ifp);
|
|
in_pcbpurgeif0(&V_udbinfo, ifp);
|
|
in_pcbpurgeif0(&V_ulitecbinfo, ifp);
|
|
in_purgemaddrs(ifp);
|
|
IN_MULTI_UNLOCK();
|
|
|
|
/*
|
|
* Make sure all multicast deletions invoking if_ioctl() are
|
|
* completed before returning. Else we risk accessing a freed
|
|
* ifnet structure pointer.
|
|
*/
|
|
inm_release_wait(NULL);
|
|
}
|
|
|
|
/*
|
|
* Delete all IPv4 multicast address records, and associated link-layer
|
|
* multicast address records, associated with ifp.
|
|
* XXX It looks like domifdetach runs AFTER the link layer cleanup.
|
|
* XXX This should not race with ifma_protospec being set during
|
|
* a new allocation, if it does, we have bigger problems.
|
|
*/
|
|
static void
|
|
in_purgemaddrs(struct ifnet *ifp)
|
|
{
|
|
struct in_multi_head purgeinms;
|
|
struct in_multi *inm;
|
|
struct ifmultiaddr *ifma, *next;
|
|
|
|
SLIST_INIT(&purgeinms);
|
|
IN_MULTI_LIST_LOCK();
|
|
|
|
/*
|
|
* Extract list of in_multi associated with the detaching ifp
|
|
* which the PF_INET layer is about to release.
|
|
* We need to do this as IF_ADDR_LOCK() may be re-acquired
|
|
* by code further down.
|
|
*/
|
|
IF_ADDR_WLOCK(ifp);
|
|
restart:
|
|
CK_STAILQ_FOREACH_SAFE(ifma, &ifp->if_multiaddrs, ifma_link, next) {
|
|
if (ifma->ifma_addr->sa_family != AF_INET ||
|
|
ifma->ifma_protospec == NULL)
|
|
continue;
|
|
inm = (struct in_multi *)ifma->ifma_protospec;
|
|
inm_rele_locked(&purgeinms, inm);
|
|
if (__predict_false(ifma_restart)) {
|
|
ifma_restart = true;
|
|
goto restart;
|
|
}
|
|
}
|
|
IF_ADDR_WUNLOCK(ifp);
|
|
|
|
inm_release_list_deferred(&purgeinms);
|
|
igmp_ifdetach(ifp);
|
|
IN_MULTI_LIST_UNLOCK();
|
|
}
|
|
|
|
struct in_llentry {
|
|
struct llentry base;
|
|
};
|
|
|
|
#define IN_LLTBL_DEFAULT_HSIZE 32
|
|
#define IN_LLTBL_HASH(k, h) \
|
|
(((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1))
|
|
|
|
/*
|
|
* Do actual deallocation of @lle.
|
|
*/
|
|
static void
|
|
in_lltable_destroy_lle_unlocked(epoch_context_t ctx)
|
|
{
|
|
struct llentry *lle;
|
|
|
|
lle = __containerof(ctx, struct llentry, lle_epoch_ctx);
|
|
LLE_LOCK_DESTROY(lle);
|
|
LLE_REQ_DESTROY(lle);
|
|
free(lle, M_LLTABLE);
|
|
}
|
|
|
|
/*
|
|
* Called by the datapath to indicate that
|
|
* the entry was used.
|
|
*/
|
|
static void
|
|
in_lltable_mark_used(struct llentry *lle)
|
|
{
|
|
|
|
LLE_REQ_LOCK(lle);
|
|
lle->r_skip_req = 0;
|
|
LLE_REQ_UNLOCK(lle);
|
|
}
|
|
|
|
/*
|
|
* Called by LLE_FREE_LOCKED when number of references
|
|
* drops to zero.
|
|
*/
|
|
static void
|
|
in_lltable_destroy_lle(struct llentry *lle)
|
|
{
|
|
|
|
LLE_WUNLOCK(lle);
|
|
NET_EPOCH_CALL(in_lltable_destroy_lle_unlocked, &lle->lle_epoch_ctx);
|
|
}
|
|
|
|
static struct llentry *
|
|
in_lltable_new(struct in_addr addr4, u_int flags)
|
|
{
|
|
struct in_llentry *lle;
|
|
|
|
lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_NOWAIT | M_ZERO);
|
|
if (lle == NULL) /* NB: caller generates msg */
|
|
return NULL;
|
|
|
|
/*
|
|
* For IPv4 this will trigger "arpresolve" to generate
|
|
* an ARP request.
|
|
*/
|
|
lle->base.la_expire = time_uptime; /* mark expired */
|
|
lle->base.r_l3addr.addr4 = addr4;
|
|
lle->base.lle_refcnt = 1;
|
|
lle->base.lle_free = in_lltable_destroy_lle;
|
|
LLE_LOCK_INIT(&lle->base);
|
|
LLE_REQ_INIT(&lle->base);
|
|
callout_init(&lle->base.lle_timer, 1);
|
|
|
|
return (&lle->base);
|
|
}
|
|
|
|
#define IN_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \
|
|
((((d).s_addr ^ (a).s_addr) & (m).s_addr)) == 0 )
|
|
|
|
static int
|
|
in_lltable_match_prefix(const struct sockaddr *saddr,
|
|
const struct sockaddr *smask, u_int flags, struct llentry *lle)
|
|
{
|
|
struct in_addr addr, mask, lle_addr;
|
|
|
|
addr = ((const struct sockaddr_in *)saddr)->sin_addr;
|
|
mask = ((const struct sockaddr_in *)smask)->sin_addr;
|
|
lle_addr.s_addr = ntohl(lle->r_l3addr.addr4.s_addr);
|
|
|
|
if (IN_ARE_MASKED_ADDR_EQUAL(lle_addr, addr, mask) == 0)
|
|
return (0);
|
|
|
|
if (lle->la_flags & LLE_IFADDR) {
|
|
/*
|
|
* Delete LLE_IFADDR records IFF address & flag matches.
|
|
* Note that addr is the interface address within prefix
|
|
* being matched.
|
|
* Note also we should handle 'ifdown' cases without removing
|
|
* ifaddr macs.
|
|
*/
|
|
if (addr.s_addr == lle_addr.s_addr && (flags & LLE_STATIC) != 0)
|
|
return (1);
|
|
return (0);
|
|
}
|
|
|
|
/* flags & LLE_STATIC means deleting both dynamic and static entries */
|
|
if ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))
|
|
return (1);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
in_lltable_free_entry(struct lltable *llt, struct llentry *lle)
|
|
{
|
|
size_t pkts_dropped;
|
|
|
|
LLE_WLOCK_ASSERT(lle);
|
|
KASSERT(llt != NULL, ("lltable is NULL"));
|
|
|
|
/* Unlink entry from table if not already */
|
|
if ((lle->la_flags & LLE_LINKED) != 0) {
|
|
IF_AFDATA_WLOCK_ASSERT(llt->llt_ifp);
|
|
lltable_unlink_entry(llt, lle);
|
|
}
|
|
|
|
/* Drop hold queue */
|
|
pkts_dropped = llentry_free(lle);
|
|
ARPSTAT_ADD(dropped, pkts_dropped);
|
|
}
|
|
|
|
static int
|
|
in_lltable_rtcheck(struct ifnet *ifp, u_int flags, const struct sockaddr *l3addr)
|
|
{
|
|
struct rt_addrinfo info;
|
|
struct sockaddr_in rt_key, rt_mask;
|
|
struct sockaddr rt_gateway;
|
|
int rt_flags;
|
|
|
|
KASSERT(l3addr->sa_family == AF_INET,
|
|
("sin_family %d", l3addr->sa_family));
|
|
|
|
bzero(&rt_key, sizeof(rt_key));
|
|
rt_key.sin_len = sizeof(rt_key);
|
|
bzero(&rt_mask, sizeof(rt_mask));
|
|
rt_mask.sin_len = sizeof(rt_mask);
|
|
bzero(&rt_gateway, sizeof(rt_gateway));
|
|
rt_gateway.sa_len = sizeof(rt_gateway);
|
|
|
|
bzero(&info, sizeof(info));
|
|
info.rti_info[RTAX_DST] = (struct sockaddr *)&rt_key;
|
|
info.rti_info[RTAX_NETMASK] = (struct sockaddr *)&rt_mask;
|
|
info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&rt_gateway;
|
|
|
|
if (rib_lookup_info(ifp->if_fib, l3addr, NHR_REF, 0, &info) != 0)
|
|
return (EINVAL);
|
|
|
|
rt_flags = info.rti_flags;
|
|
|
|
/*
|
|
* If the gateway for an existing host route matches the target L3
|
|
* address, which is a special route inserted by some implementation
|
|
* such as MANET, and the interface is of the correct type, then
|
|
* allow for ARP to proceed.
|
|
*/
|
|
if (rt_flags & RTF_GATEWAY) {
|
|
if (!(rt_flags & RTF_HOST) || !info.rti_ifp ||
|
|
info.rti_ifp->if_type != IFT_ETHER ||
|
|
(info.rti_ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) != 0 ||
|
|
memcmp(rt_gateway.sa_data, l3addr->sa_data,
|
|
sizeof(in_addr_t)) != 0) {
|
|
rib_free_info(&info);
|
|
return (EINVAL);
|
|
}
|
|
}
|
|
rib_free_info(&info);
|
|
|
|
/*
|
|
* Make sure that at least the destination address is covered
|
|
* by the route. This is for handling the case where 2 or more
|
|
* interfaces have the same prefix. An incoming packet arrives
|
|
* on one interface and the corresponding outgoing packet leaves
|
|
* another interface.
|
|
*/
|
|
if (!(rt_flags & RTF_HOST) && info.rti_ifp != ifp) {
|
|
const char *sa, *mask, *addr, *lim;
|
|
const struct sockaddr_in *l3sin;
|
|
|
|
mask = (const char *)&rt_mask;
|
|
/*
|
|
* Just being extra cautious to avoid some custom
|
|
* code getting into trouble.
|
|
*/
|
|
if ((info.rti_addrs & RTA_NETMASK) == 0)
|
|
return (EINVAL);
|
|
|
|
sa = (const char *)&rt_key;
|
|
addr = (const char *)l3addr;
|
|
l3sin = (const struct sockaddr_in *)l3addr;
|
|
lim = addr + l3sin->sin_len;
|
|
|
|
for ( ; addr < lim; sa++, mask++, addr++) {
|
|
if ((*sa ^ *addr) & *mask) {
|
|
#ifdef DIAGNOSTIC
|
|
char addrbuf[INET_ADDRSTRLEN];
|
|
|
|
log(LOG_INFO, "IPv4 address: \"%s\" "
|
|
"is not on the network\n",
|
|
inet_ntoa_r(l3sin->sin_addr, addrbuf));
|
|
#endif
|
|
return (EINVAL);
|
|
}
|
|
}
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static inline uint32_t
|
|
in_lltable_hash_dst(const struct in_addr dst, uint32_t hsize)
|
|
{
|
|
|
|
return (IN_LLTBL_HASH(dst.s_addr, hsize));
|
|
}
|
|
|
|
static uint32_t
|
|
in_lltable_hash(const struct llentry *lle, uint32_t hsize)
|
|
{
|
|
|
|
return (in_lltable_hash_dst(lle->r_l3addr.addr4, hsize));
|
|
}
|
|
|
|
static void
|
|
in_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa)
|
|
{
|
|
struct sockaddr_in *sin;
|
|
|
|
sin = (struct sockaddr_in *)sa;
|
|
bzero(sin, sizeof(*sin));
|
|
sin->sin_family = AF_INET;
|
|
sin->sin_len = sizeof(*sin);
|
|
sin->sin_addr = lle->r_l3addr.addr4;
|
|
}
|
|
|
|
static inline struct llentry *
|
|
in_lltable_find_dst(struct lltable *llt, struct in_addr dst)
|
|
{
|
|
struct llentry *lle;
|
|
struct llentries *lleh;
|
|
u_int hashidx;
|
|
|
|
hashidx = in_lltable_hash_dst(dst, llt->llt_hsize);
|
|
lleh = &llt->lle_head[hashidx];
|
|
CK_LIST_FOREACH(lle, lleh, lle_next) {
|
|
if (lle->la_flags & LLE_DELETED)
|
|
continue;
|
|
if (lle->r_l3addr.addr4.s_addr == dst.s_addr)
|
|
break;
|
|
}
|
|
|
|
return (lle);
|
|
}
|
|
|
|
static void
|
|
in_lltable_delete_entry(struct lltable *llt, struct llentry *lle)
|
|
{
|
|
|
|
lle->la_flags |= LLE_DELETED;
|
|
EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED);
|
|
#ifdef DIAGNOSTIC
|
|
log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle);
|
|
#endif
|
|
llentry_free(lle);
|
|
}
|
|
|
|
static struct llentry *
|
|
in_lltable_alloc(struct lltable *llt, u_int flags, const struct sockaddr *l3addr)
|
|
{
|
|
const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr;
|
|
struct ifnet *ifp = llt->llt_ifp;
|
|
struct llentry *lle;
|
|
char linkhdr[LLE_MAX_LINKHDR];
|
|
size_t linkhdrsize;
|
|
int lladdr_off;
|
|
|
|
KASSERT(l3addr->sa_family == AF_INET,
|
|
("sin_family %d", l3addr->sa_family));
|
|
|
|
/*
|
|
* A route that covers the given address must have
|
|
* been installed 1st because we are doing a resolution,
|
|
* verify this.
|
|
*/
|
|
if (!(flags & LLE_IFADDR) &&
|
|
in_lltable_rtcheck(ifp, flags, l3addr) != 0)
|
|
return (NULL);
|
|
|
|
lle = in_lltable_new(sin->sin_addr, flags);
|
|
if (lle == NULL) {
|
|
log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
|
|
return (NULL);
|
|
}
|
|
lle->la_flags = flags;
|
|
if (flags & LLE_STATIC)
|
|
lle->r_flags |= RLLE_VALID;
|
|
if ((flags & LLE_IFADDR) == LLE_IFADDR) {
|
|
linkhdrsize = LLE_MAX_LINKHDR;
|
|
if (lltable_calc_llheader(ifp, AF_INET, IF_LLADDR(ifp),
|
|
linkhdr, &linkhdrsize, &lladdr_off) != 0) {
|
|
NET_EPOCH_CALL(in_lltable_destroy_lle_unlocked, &lle->lle_epoch_ctx);
|
|
return (NULL);
|
|
}
|
|
lltable_set_entry_addr(ifp, lle, linkhdr, linkhdrsize,
|
|
lladdr_off);
|
|
lle->la_flags |= LLE_STATIC;
|
|
lle->r_flags |= (RLLE_VALID | RLLE_IFADDR);
|
|
}
|
|
|
|
return (lle);
|
|
}
|
|
|
|
/*
|
|
* Return NULL if not found or marked for deletion.
|
|
* If found return lle read locked.
|
|
*/
|
|
static struct llentry *
|
|
in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr)
|
|
{
|
|
const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr;
|
|
struct llentry *lle;
|
|
|
|
IF_AFDATA_LOCK_ASSERT(llt->llt_ifp);
|
|
KASSERT(l3addr->sa_family == AF_INET,
|
|
("sin_family %d", l3addr->sa_family));
|
|
KASSERT((flags & (LLE_UNLOCKED | LLE_EXCLUSIVE)) !=
|
|
(LLE_UNLOCKED | LLE_EXCLUSIVE),
|
|
("wrong lle request flags: %#x", flags));
|
|
|
|
lle = in_lltable_find_dst(llt, sin->sin_addr);
|
|
if (lle == NULL)
|
|
return (NULL);
|
|
if (flags & LLE_UNLOCKED)
|
|
return (lle);
|
|
|
|
if (flags & LLE_EXCLUSIVE)
|
|
LLE_WLOCK(lle);
|
|
else
|
|
LLE_RLOCK(lle);
|
|
|
|
/*
|
|
* If the afdata lock is not held, the LLE may have been unlinked while
|
|
* we were blocked on the LLE lock. Check for this case.
|
|
*/
|
|
if (__predict_false((lle->la_flags & LLE_LINKED) == 0)) {
|
|
if (flags & LLE_EXCLUSIVE)
|
|
LLE_WUNLOCK(lle);
|
|
else
|
|
LLE_RUNLOCK(lle);
|
|
return (NULL);
|
|
}
|
|
return (lle);
|
|
}
|
|
|
|
static int
|
|
in_lltable_dump_entry(struct lltable *llt, struct llentry *lle,
|
|
struct sysctl_req *wr)
|
|
{
|
|
struct ifnet *ifp = llt->llt_ifp;
|
|
/* XXX stack use */
|
|
struct {
|
|
struct rt_msghdr rtm;
|
|
struct sockaddr_in sin;
|
|
struct sockaddr_dl sdl;
|
|
} arpc;
|
|
struct sockaddr_dl *sdl;
|
|
int error;
|
|
|
|
bzero(&arpc, sizeof(arpc));
|
|
/* skip deleted entries */
|
|
if ((lle->la_flags & LLE_DELETED) == LLE_DELETED)
|
|
return (0);
|
|
/* Skip if jailed and not a valid IP of the prison. */
|
|
lltable_fill_sa_entry(lle,(struct sockaddr *)&arpc.sin);
|
|
if (prison_if(wr->td->td_ucred, (struct sockaddr *)&arpc.sin) != 0)
|
|
return (0);
|
|
/*
|
|
* produce a msg made of:
|
|
* struct rt_msghdr;
|
|
* struct sockaddr_in; (IPv4)
|
|
* struct sockaddr_dl;
|
|
*/
|
|
arpc.rtm.rtm_msglen = sizeof(arpc);
|
|
arpc.rtm.rtm_version = RTM_VERSION;
|
|
arpc.rtm.rtm_type = RTM_GET;
|
|
arpc.rtm.rtm_flags = RTF_UP;
|
|
arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
|
|
|
|
/* publish */
|
|
if (lle->la_flags & LLE_PUB)
|
|
arpc.rtm.rtm_flags |= RTF_ANNOUNCE;
|
|
|
|
sdl = &arpc.sdl;
|
|
sdl->sdl_family = AF_LINK;
|
|
sdl->sdl_len = sizeof(*sdl);
|
|
sdl->sdl_index = ifp->if_index;
|
|
sdl->sdl_type = ifp->if_type;
|
|
if ((lle->la_flags & LLE_VALID) == LLE_VALID) {
|
|
sdl->sdl_alen = ifp->if_addrlen;
|
|
bcopy(lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
|
|
} else {
|
|
sdl->sdl_alen = 0;
|
|
bzero(LLADDR(sdl), ifp->if_addrlen);
|
|
}
|
|
|
|
arpc.rtm.rtm_rmx.rmx_expire =
|
|
lle->la_flags & LLE_STATIC ? 0 : lle->la_expire;
|
|
arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
|
|
if (lle->la_flags & LLE_STATIC)
|
|
arpc.rtm.rtm_flags |= RTF_STATIC;
|
|
if (lle->la_flags & LLE_IFADDR)
|
|
arpc.rtm.rtm_flags |= RTF_PINNED;
|
|
arpc.rtm.rtm_index = ifp->if_index;
|
|
error = SYSCTL_OUT(wr, &arpc, sizeof(arpc));
|
|
|
|
return (error);
|
|
}
|
|
|
|
static struct lltable *
|
|
in_lltattach(struct ifnet *ifp)
|
|
{
|
|
struct lltable *llt;
|
|
|
|
llt = lltable_allocate_htbl(IN_LLTBL_DEFAULT_HSIZE);
|
|
llt->llt_af = AF_INET;
|
|
llt->llt_ifp = ifp;
|
|
|
|
llt->llt_lookup = in_lltable_lookup;
|
|
llt->llt_alloc_entry = in_lltable_alloc;
|
|
llt->llt_delete_entry = in_lltable_delete_entry;
|
|
llt->llt_dump_entry = in_lltable_dump_entry;
|
|
llt->llt_hash = in_lltable_hash;
|
|
llt->llt_fill_sa_entry = in_lltable_fill_sa_entry;
|
|
llt->llt_free_entry = in_lltable_free_entry;
|
|
llt->llt_match_prefix = in_lltable_match_prefix;
|
|
llt->llt_mark_used = in_lltable_mark_used;
|
|
lltable_link(llt);
|
|
|
|
return (llt);
|
|
}
|
|
|
|
void *
|
|
in_domifattach(struct ifnet *ifp)
|
|
{
|
|
struct in_ifinfo *ii;
|
|
|
|
ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO);
|
|
|
|
ii->ii_llt = in_lltattach(ifp);
|
|
ii->ii_igmp = igmp_domifattach(ifp);
|
|
|
|
return (ii);
|
|
}
|
|
|
|
void
|
|
in_domifdetach(struct ifnet *ifp, void *aux)
|
|
{
|
|
struct in_ifinfo *ii = (struct in_ifinfo *)aux;
|
|
|
|
igmp_domifdetach(ifp);
|
|
lltable_free(ii->ii_llt);
|
|
free(ii, M_IFADDR);
|
|
}
|