Similar to 2cd6ad766e
for inet6 drop ifma_restart use, creating more
problems than solving. It is no longer needed after epoch introduction.
While there, add NULL check for ifma_ifp in igmp_change_state(), that
sometimes caused panics on interface destruction.
MFC after: 2 weeks
481 lines
15 KiB
C
481 lines
15 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1985, 1986, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 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_var.h 8.2 (Berkeley) 1/9/95
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* $FreeBSD$
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*/
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#ifndef _NETINET_IN_VAR_H_
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#define _NETINET_IN_VAR_H_
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/*
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* Argument structure for SIOCAIFADDR.
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*/
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struct in_aliasreq {
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char ifra_name[IFNAMSIZ]; /* if name, e.g. "en0" */
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struct sockaddr_in ifra_addr;
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struct sockaddr_in ifra_broadaddr;
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#define ifra_dstaddr ifra_broadaddr
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struct sockaddr_in ifra_mask;
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int ifra_vhid;
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};
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#ifdef _KERNEL
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#include <sys/queue.h>
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#include <sys/fnv_hash.h>
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#include <sys/tree.h>
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struct igmp_ifsoftc;
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struct in_multi;
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struct lltable;
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SLIST_HEAD(in_multi_head, in_multi);
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/*
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* IPv4 per-interface state.
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*/
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struct in_ifinfo {
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struct lltable *ii_llt; /* ARP state */
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struct igmp_ifsoftc *ii_igmp; /* IGMP state */
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struct in_multi *ii_allhosts; /* 224.0.0.1 membership */
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};
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/*
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* Interface address, Internet version. One of these structures
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* is allocated for each Internet address on an interface.
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* The ifaddr structure contains the protocol-independent part
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* of the structure and is assumed to be first.
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*/
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struct in_ifaddr {
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struct ifaddr ia_ifa; /* protocol-independent info */
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#define ia_ifp ia_ifa.ifa_ifp
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#define ia_flags ia_ifa.ifa_flags
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/* ia_subnet{,mask} in host order */
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u_long ia_subnet; /* subnet address */
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u_long ia_subnetmask; /* mask of subnet */
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CK_LIST_ENTRY(in_ifaddr) ia_hash; /* hash of internet addresses */
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CK_STAILQ_ENTRY(in_ifaddr) ia_link; /* list of internet addresses */
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struct sockaddr_in ia_addr; /* reserve space for interface name */
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struct sockaddr_in ia_dstaddr; /* reserve space for broadcast addr */
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#define ia_broadaddr ia_dstaddr
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struct sockaddr_in ia_sockmask; /* reserve space for general netmask */
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struct callout ia_garp_timer; /* timer for retransmitting GARPs */
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int ia_garp_count; /* count of retransmitted GARPs */
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};
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/*
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* Given a pointer to an in_ifaddr (ifaddr),
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* return a pointer to the addr as a sockaddr_in.
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*/
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#define IA_SIN(ia) (&(((struct in_ifaddr *)(ia))->ia_addr))
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#define IA_DSTSIN(ia) (&(((struct in_ifaddr *)(ia))->ia_dstaddr))
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#define IA_MASKSIN(ia) (&(((struct in_ifaddr *)(ia))->ia_sockmask))
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#define IN_LNAOF(in, ifa) \
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((ntohl((in).s_addr) & ~((struct in_ifaddr *)(ifa)->ia_subnetmask))
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#define LLTABLE(ifp) \
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((struct in_ifinfo *)(ifp)->if_afdata[AF_INET])->ii_llt
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/*
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* Hash table for IP addresses.
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*/
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CK_STAILQ_HEAD(in_ifaddrhead, in_ifaddr);
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CK_LIST_HEAD(in_ifaddrhashhead, in_ifaddr);
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VNET_DECLARE(struct in_ifaddrhashhead *, in_ifaddrhashtbl);
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VNET_DECLARE(struct in_ifaddrhead, in_ifaddrhead);
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VNET_DECLARE(u_long, in_ifaddrhmask); /* mask for hash table */
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#define V_in_ifaddrhashtbl VNET(in_ifaddrhashtbl)
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#define V_in_ifaddrhead VNET(in_ifaddrhead)
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#define V_in_ifaddrhmask VNET(in_ifaddrhmask)
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#define INADDR_NHASH_LOG2 9
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#define INADDR_NHASH (1 << INADDR_NHASH_LOG2)
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#define INADDR_HASHVAL(x) fnv_32_buf((&(x)), sizeof(x), FNV1_32_INIT)
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#define INADDR_HASH(x) \
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(&V_in_ifaddrhashtbl[INADDR_HASHVAL(x) & V_in_ifaddrhmask])
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/*
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* Macro for finding the internet address structure (in_ifaddr)
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* corresponding to one of our IP addresses (in_addr).
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*/
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#define INADDR_TO_IFADDR(addr, ia) \
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/* struct in_addr addr; */ \
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/* struct in_ifaddr *ia; */ \
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do { \
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NET_EPOCH_ASSERT(); \
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CK_LIST_FOREACH(ia, INADDR_HASH((addr).s_addr), ia_hash) \
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if (IA_SIN(ia)->sin_addr.s_addr == (addr).s_addr) \
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break; \
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} while (0)
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/*
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* Macro for finding the interface (ifnet structure) corresponding to one
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* of our IP addresses.
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*/
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#define INADDR_TO_IFP(addr, ifp) \
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/* struct in_addr addr; */ \
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/* struct ifnet *ifp; */ \
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{ \
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struct in_ifaddr *ia; \
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\
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INADDR_TO_IFADDR(addr, ia); \
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(ifp) = (ia == NULL) ? NULL : ia->ia_ifp; \
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}
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/*
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* Macro for finding the internet address structure (in_ifaddr) corresponding
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* to a given interface (ifnet structure).
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*/
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#define IFP_TO_IA(ifp, ia) \
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/* struct ifnet *ifp; */ \
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/* struct in_ifaddr *ia; */ \
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do { \
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NET_EPOCH_ASSERT(); \
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for ((ia) = CK_STAILQ_FIRST(&V_in_ifaddrhead); \
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(ia) != NULL && (ia)->ia_ifp != (ifp); \
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(ia) = CK_STAILQ_NEXT((ia), ia_link)) \
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continue; \
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} while (0)
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/*
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* Legacy IPv4 IGMP per-link structure.
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*/
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struct router_info {
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struct ifnet *rti_ifp;
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int rti_type; /* type of router which is querier on this interface */
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int rti_time; /* # of slow timeouts since last old query */
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SLIST_ENTRY(router_info) rti_list;
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};
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/*
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* IPv4 multicast IGMP-layer source entry.
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*/
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struct ip_msource {
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RB_ENTRY(ip_msource) ims_link; /* RB tree links */
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in_addr_t ims_haddr; /* host byte order */
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struct ims_st {
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uint16_t ex; /* # of exclusive members */
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uint16_t in; /* # of inclusive members */
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} ims_st[2]; /* state at t0, t1 */
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uint8_t ims_stp; /* pending query */
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};
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/*
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* IPv4 multicast PCB-layer source entry.
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*/
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struct in_msource {
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RB_ENTRY(ip_msource) ims_link; /* RB tree links */
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in_addr_t ims_haddr; /* host byte order */
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uint8_t imsl_st[2]; /* state before/at commit */
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};
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RB_HEAD(ip_msource_tree, ip_msource); /* define struct ip_msource_tree */
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static __inline int
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ip_msource_cmp(const struct ip_msource *a, const struct ip_msource *b)
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{
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if (a->ims_haddr < b->ims_haddr)
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return (-1);
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if (a->ims_haddr == b->ims_haddr)
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return (0);
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return (1);
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}
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RB_PROTOTYPE(ip_msource_tree, ip_msource, ims_link, ip_msource_cmp);
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/*
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* IPv4 multicast PCB-layer group filter descriptor.
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*/
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struct in_mfilter {
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struct ip_msource_tree imf_sources; /* source list for (S,G) */
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u_long imf_nsrc; /* # of source entries */
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uint8_t imf_st[2]; /* state before/at commit */
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struct in_multi *imf_inm; /* associated multicast address */
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STAILQ_ENTRY(in_mfilter) imf_entry; /* list entry */
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};
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/*
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* Helper types and functions for IPv4 multicast filters.
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*/
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STAILQ_HEAD(ip_mfilter_head, in_mfilter);
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struct in_mfilter *ip_mfilter_alloc(int mflags, int st0, int st1);
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void ip_mfilter_free(struct in_mfilter *);
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static inline void
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ip_mfilter_init(struct ip_mfilter_head *head)
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{
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STAILQ_INIT(head);
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}
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static inline struct in_mfilter *
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ip_mfilter_first(const struct ip_mfilter_head *head)
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{
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return (STAILQ_FIRST(head));
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}
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static inline void
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ip_mfilter_insert(struct ip_mfilter_head *head, struct in_mfilter *imf)
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{
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STAILQ_INSERT_TAIL(head, imf, imf_entry);
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}
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static inline void
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ip_mfilter_remove(struct ip_mfilter_head *head, struct in_mfilter *imf)
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{
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STAILQ_REMOVE(head, imf, in_mfilter, imf_entry);
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}
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#define IP_MFILTER_FOREACH(imf, head) \
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STAILQ_FOREACH(imf, head, imf_entry)
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static inline size_t
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ip_mfilter_count(struct ip_mfilter_head *head)
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{
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struct in_mfilter *imf;
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size_t num = 0;
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STAILQ_FOREACH(imf, head, imf_entry)
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num++;
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return (num);
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}
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/*
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* IPv4 group descriptor.
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*
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* For every entry on an ifnet's if_multiaddrs list which represents
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* an IP multicast group, there is one of these structures.
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*
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* If any source filters are present, then a node will exist in the RB-tree
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* to permit fast lookup by source whenever an operation takes place.
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* This permits pre-order traversal when we issue reports.
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* Source filter trees are kept separately from the socket layer to
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* greatly simplify locking.
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*
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* When IGMPv3 is active, inm_timer is the response to group query timer.
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* The state-change timer inm_sctimer is separate; whenever state changes
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* for the group the state change record is generated and transmitted,
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* and kept if retransmissions are necessary.
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*
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* FUTURE: inm_link is now only used when groups are being purged
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* on a detaching ifnet. It could be demoted to a SLIST_ENTRY, but
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* because it is at the very start of the struct, we can't do this
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* w/o breaking the ABI for ifmcstat.
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*/
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struct in_multi {
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LIST_ENTRY(in_multi) inm_link; /* to-be-released by in_ifdetach */
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struct in_addr inm_addr; /* IP multicast address, convenience */
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struct ifnet *inm_ifp; /* back pointer to ifnet */
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struct ifmultiaddr *inm_ifma; /* back pointer to ifmultiaddr */
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u_int inm_timer; /* IGMPv1/v2 group / v3 query timer */
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u_int inm_state; /* state of the membership */
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void *inm_rti; /* unused, legacy field */
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u_int inm_refcount; /* reference count */
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/* New fields for IGMPv3 follow. */
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struct igmp_ifsoftc *inm_igi; /* IGMP info */
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SLIST_ENTRY(in_multi) inm_nrele; /* to-be-released by IGMP */
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struct ip_msource_tree inm_srcs; /* tree of sources */
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u_long inm_nsrc; /* # of tree entries */
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struct mbufq inm_scq; /* queue of pending
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* state-change packets */
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struct timeval inm_lastgsrtv; /* Time of last G-S-R query */
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uint16_t inm_sctimer; /* state-change timer */
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uint16_t inm_scrv; /* state-change rexmit count */
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/*
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* SSM state counters which track state at T0 (the time the last
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* state-change report's RV timer went to zero) and T1
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* (time of pending report, i.e. now).
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* Used for computing IGMPv3 state-change reports. Several refcounts
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* are maintained here to optimize for common use-cases.
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*/
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struct inm_st {
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uint16_t iss_fmode; /* IGMP filter mode */
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uint16_t iss_asm; /* # of ASM listeners */
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uint16_t iss_ex; /* # of exclusive members */
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uint16_t iss_in; /* # of inclusive members */
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uint16_t iss_rec; /* # of recorded sources */
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} inm_st[2]; /* state at t0, t1 */
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};
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/*
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* Helper function to derive the filter mode on a source entry
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* from its internal counters. Predicates are:
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* A source is only excluded if all listeners exclude it.
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* A source is only included if no listeners exclude it,
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* and at least one listener includes it.
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* May be used by ifmcstat(8).
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*/
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static __inline uint8_t
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ims_get_mode(const struct in_multi *inm, const struct ip_msource *ims,
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uint8_t t)
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{
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t = !!t;
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if (inm->inm_st[t].iss_ex > 0 &&
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inm->inm_st[t].iss_ex == ims->ims_st[t].ex)
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return (MCAST_EXCLUDE);
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else if (ims->ims_st[t].in > 0 && ims->ims_st[t].ex == 0)
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return (MCAST_INCLUDE);
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return (MCAST_UNDEFINED);
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}
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#ifdef SYSCTL_DECL
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SYSCTL_DECL(_net_inet);
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SYSCTL_DECL(_net_inet_ip);
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SYSCTL_DECL(_net_inet_raw);
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#endif
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/*
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* Lock macros for IPv4 layer multicast address lists. IPv4 lock goes
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* before link layer multicast locks in the lock order. In most cases,
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* consumers of IN_*_MULTI() macros should acquire the locks before
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* calling them; users of the in_{add,del}multi() functions should not.
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*/
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extern struct mtx in_multi_list_mtx;
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extern struct sx in_multi_sx;
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#define IN_MULTI_LIST_LOCK() mtx_lock(&in_multi_list_mtx)
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#define IN_MULTI_LIST_UNLOCK() mtx_unlock(&in_multi_list_mtx)
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#define IN_MULTI_LIST_LOCK_ASSERT() mtx_assert(&in_multi_list_mtx, MA_OWNED)
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#define IN_MULTI_LIST_UNLOCK_ASSERT() mtx_assert(&in_multi_list_mtx, MA_NOTOWNED)
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#define IN_MULTI_LOCK() sx_xlock(&in_multi_sx)
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#define IN_MULTI_UNLOCK() sx_xunlock(&in_multi_sx)
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#define IN_MULTI_LOCK_ASSERT() sx_assert(&in_multi_sx, SA_XLOCKED)
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#define IN_MULTI_UNLOCK_ASSERT() sx_assert(&in_multi_sx, SA_XUNLOCKED)
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void inm_disconnect(struct in_multi *inm);
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/*
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* Get the in_multi pointer from a ifmultiaddr.
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* Returns NULL if ifmultiaddr is no longer valid.
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*/
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static __inline struct in_multi *
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inm_ifmultiaddr_get_inm(struct ifmultiaddr *ifma)
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{
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NET_EPOCH_ASSERT();
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return ((ifma->ifma_addr->sa_family != AF_INET ||
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(ifma->ifma_flags & IFMA_F_ENQUEUED) == 0) ? NULL :
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ifma->ifma_protospec);
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}
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/* Acquire an in_multi record. */
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static __inline void
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inm_acquire_locked(struct in_multi *inm)
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{
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IN_MULTI_LIST_LOCK_ASSERT();
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++inm->inm_refcount;
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}
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static __inline void
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inm_acquire(struct in_multi *inm)
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{
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IN_MULTI_LIST_LOCK();
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inm_acquire_locked(inm);
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IN_MULTI_LIST_UNLOCK();
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}
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static __inline void
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inm_rele_locked(struct in_multi_head *inmh, struct in_multi *inm)
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{
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MPASS(inm->inm_refcount > 0);
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IN_MULTI_LIST_LOCK_ASSERT();
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if (--inm->inm_refcount == 0) {
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MPASS(inmh != NULL);
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inm_disconnect(inm);
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inm->inm_ifma->ifma_protospec = NULL;
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SLIST_INSERT_HEAD(inmh, inm, inm_nrele);
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}
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}
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/*
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* Return values for imo_multi_filter().
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*/
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#define MCAST_PASS 0 /* Pass */
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#define MCAST_NOTGMEMBER 1 /* This host not a member of group */
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#define MCAST_NOTSMEMBER 2 /* This host excluded source */
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#define MCAST_MUTED 3 /* [deprecated] */
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struct rib_head;
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struct ip_moptions;
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struct in_multi *inm_lookup_locked(struct ifnet *, const struct in_addr);
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struct in_multi *inm_lookup(struct ifnet *, const struct in_addr);
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int imo_multi_filter(const struct ip_moptions *, const struct ifnet *,
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const struct sockaddr *, const struct sockaddr *);
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void inm_commit(struct in_multi *);
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void inm_clear_recorded(struct in_multi *);
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void inm_print(const struct in_multi *);
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int inm_record_source(struct in_multi *inm, const in_addr_t);
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void inm_release_deferred(struct in_multi *);
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void inm_release_list_deferred(struct in_multi_head *);
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void inm_release_wait(void *);
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int in_joingroup(struct ifnet *, const struct in_addr *,
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/*const*/ struct in_mfilter *, struct in_multi **);
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int in_joingroup_locked(struct ifnet *, const struct in_addr *,
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/*const*/ struct in_mfilter *, struct in_multi **);
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int in_leavegroup(struct in_multi *, /*const*/ struct in_mfilter *);
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int in_leavegroup_locked(struct in_multi *,
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/*const*/ struct in_mfilter *);
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int in_control(struct socket *, u_long, void *, struct ifnet *,
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struct thread *);
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int in_addprefix(struct in_ifaddr *);
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int in_scrubprefix(struct in_ifaddr *, u_int);
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void in_ifscrub_all(void);
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void ip_input(struct mbuf *);
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void ip_direct_input(struct mbuf *);
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void in_ifadown(struct ifaddr *ifa, int);
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struct mbuf *ip_tryforward(struct mbuf *);
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void *in_domifattach(struct ifnet *);
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void in_domifdetach(struct ifnet *, void *);
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struct rib_head *in_inithead(uint32_t fibnum);
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#ifdef VIMAGE
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void in_detachhead(struct rib_head *rh);
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#endif
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#endif /* _KERNEL */
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/* INET6 stuff */
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#include <netinet6/in6_var.h>
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#endif /* _NETINET_IN_VAR_H_ */
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