This change is based on the nexthop objects landed in D24232. The change introduces the concept of nexthop groups. Each group contains the collection of nexthops with their relative weights and a dataplane-optimized structure to enable efficient nexthop selection. Simular to the nexthops, nexthop groups are immutable. Dataplane part gets compiled during group creation and is basically an array of nexthop pointers, compiled w.r.t their weights. With this change, `rt_nhop` field of `struct rtentry` contains either nexthop or nexthop group. They are distinguished by the presense of NHF_MULTIPATH flag. All dataplane lookup functions returns pointer to the nexthop object, leaving nexhop groups details inside routing subsystem. User-visible changes: The change is intended to be backward-compatible: all non-mpath operations should work as before with ROUTE_MPATH and net.route.multipath=1. All routes now comes with weight, default weight is 1, maximum is 2^24-1. Current maximum multipath group width is statically set to 64. This will become sysctl-tunable in the followup changes. Using functionality: * Recompile kernel with ROUTE_MPATH * set net.route.multipath to 1 route add -6 2001:db8::/32 2001:db8::2 -weight 10 route add -6 2001:db8::/32 2001:db8::3 -weight 20 netstat -6On Nexthop groups data Internet6: GrpIdx NhIdx Weight Slots Gateway Netif Refcnt 1 ------- ------- ------- --------------------------------------- --------- 1 13 10 1 2001:db8::2 vlan2 14 20 2 2001:db8::3 vlan2 Next steps: * Land outbound hashing for locally-originated routes ( D26523 ). * Fix net/bird multipath (net/frr seems to work fine) * Add ROUTE_MPATH to GENERIC * Set net.route.multipath=1 by default Tested by: olivier Reviewed by: glebius Relnotes: yes Differential Revision: https://reviews.freebsd.org/D26449
1509 lines
38 KiB
C
1509 lines
38 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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|
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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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|
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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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|
|
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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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/*
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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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/*
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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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/*
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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 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:
|
|
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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* 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);
|
|
}
|
|
|
|
error = 0;
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|
switch (cmd) {
|
|
case SIOCGIFADDR:
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*addr = ia->ia_addr;
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break;
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|
|
|
case SIOCGIFBRDADDR:
|
|
if ((ifp->if_flags & IFF_BROADCAST) == 0) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
*addr = ia->ia_broadaddr;
|
|
break;
|
|
|
|
case SIOCGIFDSTADDR:
|
|
if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
*addr = ia->ia_dstaddr;
|
|
break;
|
|
|
|
case SIOCGIFNETMASK:
|
|
*addr = ia->ia_sockmask;
|
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break;
|
|
}
|
|
|
|
NET_EPOCH_EXIT(et);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
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in_aifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td)
|
|
{
|
|
const struct in_aliasreq *ifra = (struct in_aliasreq *)data;
|
|
const struct sockaddr_in *addr = &ifra->ifra_addr;
|
|
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;
|
|
struct in_ifaddr *ia;
|
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bool iaIsFirst;
|
|
int error = 0;
|
|
|
|
error = priv_check(td, PRIV_NET_ADDIFADDR);
|
|
if (error)
|
|
return (error);
|
|
|
|
/*
|
|
* ifra_addr must be present and be of INET family.
|
|
* ifra_broadaddr/ifra_dstaddr and ifra_mask are optional.
|
|
*/
|
|
if (addr->sin_len != sizeof(struct sockaddr_in) ||
|
|
addr->sin_family != AF_INET)
|
|
return (EINVAL);
|
|
if (broadaddr->sin_len != 0 &&
|
|
(broadaddr->sin_len != sizeof(struct sockaddr_in) ||
|
|
broadaddr->sin_family != AF_INET))
|
|
return (EINVAL);
|
|
if (mask->sin_len != 0 &&
|
|
(mask->sin_len != sizeof(struct sockaddr_in) ||
|
|
mask->sin_family != AF_INET))
|
|
return (EINVAL);
|
|
if ((ifp->if_flags & IFF_POINTOPOINT) &&
|
|
(dstaddr->sin_len != sizeof(struct sockaddr_in) ||
|
|
dstaddr->sin_addr.s_addr == INADDR_ANY))
|
|
return (EDESTADDRREQ);
|
|
if (vhid > 0 && carp_attach_p == NULL)
|
|
return (EPROTONOSUPPORT);
|
|
|
|
/*
|
|
* See whether address already exist.
|
|
*/
|
|
iaIsFirst = true;
|
|
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;
|
|
iaIsFirst = false;
|
|
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;
|
|
}
|
|
NET_EPOCH_EXIT(et);
|
|
|
|
if (ia != NULL)
|
|
(void )in_difaddr_ioctl(cmd, data, ifp, td);
|
|
|
|
ifa = ifa_alloc(sizeof(struct in_ifaddr), M_WAITOK);
|
|
ia = (struct in_ifaddr *)ifa;
|
|
ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr;
|
|
ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
|
|
ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask;
|
|
callout_init_rw(&ia->ia_garp_timer, &ifp->if_addr_lock,
|
|
CALLOUT_RETURNUNLOCKED);
|
|
|
|
ia->ia_ifp = ifp;
|
|
ia->ia_addr = *addr;
|
|
if (mask->sin_len != 0) {
|
|
ia->ia_sockmask = *mask;
|
|
ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr);
|
|
} else {
|
|
in_addr_t i = ntohl(addr->sin_addr.s_addr);
|
|
|
|
/*
|
|
* Be compatible with network classes, if netmask isn't
|
|
* supplied, guess it based on classes.
|
|
*/
|
|
if (IN_CLASSA(i))
|
|
ia->ia_subnetmask = IN_CLASSA_NET;
|
|
else if (IN_CLASSB(i))
|
|
ia->ia_subnetmask = IN_CLASSB_NET;
|
|
else
|
|
ia->ia_subnetmask = IN_CLASSC_NET;
|
|
ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
|
|
}
|
|
ia->ia_subnet = ntohl(addr->sin_addr.s_addr) & ia->ia_subnetmask;
|
|
in_socktrim(&ia->ia_sockmask);
|
|
|
|
if (ifp->if_flags & IFF_BROADCAST) {
|
|
if (broadaddr->sin_len != 0) {
|
|
ia->ia_broadaddr = *broadaddr;
|
|
} else if (ia->ia_subnetmask == IN_RFC3021_MASK) {
|
|
ia->ia_broadaddr.sin_addr.s_addr = INADDR_BROADCAST;
|
|
ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in);
|
|
ia->ia_broadaddr.sin_family = AF_INET;
|
|
} else {
|
|
ia->ia_broadaddr.sin_addr.s_addr =
|
|
htonl(ia->ia_subnet | ~ia->ia_subnetmask);
|
|
ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in);
|
|
ia->ia_broadaddr.sin_family = AF_INET;
|
|
}
|
|
}
|
|
|
|
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) {
|
|
error = (*carp_attach_p)(&ia->ia_ifa, vhid);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
|
|
/* 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);
|
|
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);
|
|
}
|
|
|
|
#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 or add one accordingly.
|
|
*/
|
|
int
|
|
in_addprefix(struct in_ifaddr *target, int flags)
|
|
{
|
|
struct rm_priotracker in_ifa_tracker;
|
|
struct in_ifaddr *ia;
|
|
struct in_addr prefix, mask, p, m;
|
|
int error;
|
|
|
|
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) {
|
|
if (V_nosameprefix) {
|
|
IN_IFADDR_RUNLOCK(&in_ifa_tracker);
|
|
return (EEXIST);
|
|
} else {
|
|
int fibnum;
|
|
|
|
fibnum = V_rt_add_addr_allfibs ? RT_ALL_FIBS :
|
|
target->ia_ifp->if_fib;
|
|
rt_addrmsg(RTM_ADD, &target->ia_ifa, fibnum);
|
|
IN_IFADDR_RUNLOCK(&in_ifa_tracker);
|
|
return (0);
|
|
}
|
|
}
|
|
}
|
|
IN_IFADDR_RUNLOCK(&in_ifa_tracker);
|
|
|
|
/*
|
|
* 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) {
|
|
int fibnum;
|
|
|
|
fibnum = V_rt_add_addr_allfibs ? RT_ALL_FIBS :
|
|
target->ia_ifp->if_fib;
|
|
rt_addrmsg(RTM_DELETE, &target->ia_ifa, fibnum);
|
|
|
|
/*
|
|
* 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);
|
|
}
|