4c25fb2f83
In the MP-safe world, a rtentry stemming from a rtcache can be freed at any points. So we need to protect rtentries somehow say by reference couting or passive references. Regardless of the method, we need to call some release function of a rtentry after using it. The change adds a new function rtcache_unref to release a rtentry. At this point, this function does nothing because for now we don't add a reference to a rtentry when we get one from a rtcache. We will add something useful in a further commit. This change is a part of changes for MP-safe routing table. It is separated to avoid one big change that makes difficult to debug by bisecting.
412 lines
17 KiB
C
412 lines
17 KiB
C
/* $NetBSD: ip6_var.h,v 1.71 2016/12/08 05:16:34 ozaki-r Exp $ */
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/* $KAME: ip6_var.h,v 1.33 2000/06/11 14:59:20 jinmei Exp $ */
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/*
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 1982, 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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* @(#)ip_var.h 8.1 (Berkeley) 6/10/93
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*/
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#ifndef _NETINET6_IP6_VAR_H_
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#define _NETINET6_IP6_VAR_H_
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#include <sys/socketvar.h>
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#include <net/route.h>
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/*
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* IP6 reassembly queue structure. Each fragment
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* being reassembled is attached to one of these structures.
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*/
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struct ip6q {
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u_int32_t ip6q_head;
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u_int16_t ip6q_len;
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u_int8_t ip6q_nxt; /* ip6f_nxt in first fragment */
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u_int8_t ip6q_hlim;
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struct ip6asfrag *ip6q_down;
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struct ip6asfrag *ip6q_up;
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u_int32_t ip6q_ident;
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u_int8_t ip6q_arrive;
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u_int8_t ip6q_ttl;
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struct in6_addr ip6q_src, ip6q_dst;
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struct ip6q *ip6q_next;
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struct ip6q *ip6q_prev;
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int ip6q_unfrglen; /* len of unfragmentable part */
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#ifdef notyet
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u_char *ip6q_nxtp;
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#endif
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int ip6q_nfrag; /* # of fragments */
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};
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struct ip6asfrag {
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u_int32_t ip6af_head;
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u_int16_t ip6af_len;
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u_int8_t ip6af_nxt;
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u_int8_t ip6af_hlim;
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/* must not override the above members during reassembling */
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struct ip6asfrag *ip6af_down;
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struct ip6asfrag *ip6af_up;
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struct mbuf *ip6af_m;
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int ip6af_offset; /* offset in ip6af_m to next header */
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int ip6af_frglen; /* fragmentable part length */
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int ip6af_off; /* fragment offset */
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u_int16_t ip6af_mff; /* more fragment bit in frag off */
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};
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#define IP6_REASS_MBUF(ip6af) ((ip6af)->ip6af_m)
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struct ip6_moptions {
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if_index_t im6o_multicast_if_index; /* I/F for outgoing multicasts */
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u_char im6o_multicast_hlim; /* hoplimit for outgoing multicasts */
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u_char im6o_multicast_loop; /* 1 >= hear sends if a member */
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LIST_HEAD(, in6_multi_mship) im6o_memberships;
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};
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/*
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* Control options for outgoing packets
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*/
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/* Routing header related info */
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struct ip6po_rhinfo {
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struct ip6_rthdr *ip6po_rhi_rthdr; /* Routing header */
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struct route ip6po_rhi_route; /* Route to the 1st hop */
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};
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#define ip6po_rthdr ip6po_rhinfo.ip6po_rhi_rthdr
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#define ip6po_route ip6po_rhinfo.ip6po_rhi_route
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/* Nexthop related info */
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struct ip6po_nhinfo {
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struct sockaddr *ip6po_nhi_nexthop;
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struct route ip6po_nhi_route; /* Route to the nexthop */
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};
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#define ip6po_nexthop ip6po_nhinfo.ip6po_nhi_nexthop
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#define ip6po_nextroute ip6po_nhinfo.ip6po_nhi_route
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struct ip6_pktopts {
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int ip6po_hlim; /* Hoplimit for outgoing packets */
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struct in6_pktinfo *ip6po_pktinfo; /* Outgoing IF/address information */
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struct ip6po_nhinfo ip6po_nhinfo; /* Next-hop address information */
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struct ip6_hbh *ip6po_hbh; /* Hop-by-Hop options header */
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struct ip6_dest *ip6po_dest1; /* Destination options header(1st part) */
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struct ip6po_rhinfo ip6po_rhinfo; /* Routing header related info. */
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struct ip6_dest *ip6po_dest2; /* Destination options header(2nd part) */
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int ip6po_tclass; /* traffic class */
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int ip6po_minmtu; /* fragment vs PMTU discovery policy */
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#define IP6PO_MINMTU_MCASTONLY -1 /* default; send at min MTU for multicast*/
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#define IP6PO_MINMTU_DISABLE 0 /* always perform pmtu disc */
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#define IP6PO_MINMTU_ALL 1 /* always send at min MTU */
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int ip6po_prefer_tempaddr; /* whether temporary addresses are
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* preferred as source address */
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#define IP6PO_TEMPADDR_SYSTEM -1 /* follow the system default */
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#define IP6PO_TEMPADDR_NOTPREFER 0 /* not prefer temporary address */
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#define IP6PO_TEMPADDR_PREFER 1 /* prefer temporary address */
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int ip6po_flags;
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#if 0 /* parameters in this block is obsolete. do not reuse the values. */
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#define IP6PO_REACHCONF 0x01 /* upper-layer reachability confirmation. */
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#define IP6PO_MINMTU 0x02 /* use minimum MTU (IPV6_USE_MIN_MTU) */
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#endif
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#define IP6PO_DONTFRAG 0x04 /* disable fragmentation (IPV6_DONTFRAG) */
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};
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/*
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* IPv6 statistics.
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* Each counter is an unsigned 64-bit value.
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*/
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#define IP6_STAT_TOTAL 0 /* total packets received */
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#define IP6_STAT_TOOSHORT 1 /* packet too short */
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#define IP6_STAT_TOOSMALL 2 /* not enough data */
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#define IP6_STAT_FRAGMENTS 3 /* fragments received */
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#define IP6_STAT_FRAGDROPPED 4 /* frags dropped (dups, out of space) */
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#define IP6_STAT_FRAGTIMEOUT 5 /* fragments timed out */
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#define IP6_STAT_FRAGOVERFLOW 6 /* fragments that exceed limit */
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#define IP6_STAT_FORWARD 7 /* packets forwarded */
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#define IP6_STAT_CANTFORWARD 8 /* packets rcvd for uncreachable dst */
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#define IP6_STAT_REDIRECTSENT 9 /* packets forwarded on same net */
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#define IP6_STAT_DELIVERED 10 /* datagrams delivered to upper level */
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#define IP6_STAT_LOCALOUT 11 /* total IP packets generated here */
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#define IP6_STAT_ODROPPED 12 /* lost packets due to nobufs, etc. */
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#define IP6_STAT_REASSEMBLED 13 /* total packets reassembled ok */
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#define IP6_STAT_FRAGMENTED 14 /* datagrams successfully fragmented */
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#define IP6_STAT_OFRAGMENTS 15 /* output fragments created */
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#define IP6_STAT_CANTFRAG 16 /* don't fragment flag was set, etc. */
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#define IP6_STAT_BADOPTIONS 17 /* error in option processing */
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#define IP6_STAT_NOROUTE 18 /* packets discarded due to no route */
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#define IP6_STAT_BADVERS 19 /* ip6 version != 6 */
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#define IP6_STAT_RAWOUT 20 /* total raw ip packets generated */
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#define IP6_STAT_BADSCOPE 21 /* scope error */
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#define IP6_STAT_NOTMEMBER 22 /* don't join this multicast group */
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#define IP6_STAT_NXTHIST 23 /* next header histogram */
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/* space for 256 counters */
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#define IP6_STAT_M1 279 /* one mbuf */
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#define IP6_STAT_M2M 280 /* two or more mbuf */
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/* space for 32 counters */
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#define IP6_STAT_MEXT1 312 /* one ext mbuf */
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#define IP6_STAT_MEXT2M 313 /* two or more ext mbuf */
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#define IP6_STAT_EXTHDRTOOLONG 314 /* ext hdr are not contiguous */
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#define IP6_STAT_NOGIF 315 /* no match gif found */
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#define IP6_STAT_TOOMANYHDR 316 /* discarded due to too many headers */
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/*
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* statistics for improvement of the source address selection
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* algorithm:
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* XXX: hardcoded 16 = # of ip6 multicast scope types + 1
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*/
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#define IP6_STAT_SOURCES_NONE 317 /* number of times that address
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selection fails */
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#define IP6_STAT_SOURCES_SAMEIF 318 /* number of times that an address
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on the outgoing I/F is chosen */
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/* space for 16 counters */
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#define IP6_STAT_SOURCES_OTHERIF 334 /* number of times that an address on
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a non-outgoing I/F is chosen */
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/* space for 16 counters */
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#define IP6_STAT_SOURCES_SAMESCOPE 350 /* number of times that an address that
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has the same scope from the dest.
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is chosen */
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/* space for 16 counters */
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#define IP6_STAT_SOURCES_OTHERSCOPE 366 /* number of times that an address that
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has a different scope from the dest.
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is chosen */
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/* space for 16 counters */
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#define IP6_STAT_SOURCES_DEPRECATED 382 /* number of times that a deprecated
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address is chosen */
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/* space for 16 counters */
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#define IP6_STAT_FORWARD_CACHEHIT 398
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#define IP6_STAT_FORWARD_CACHEMISS 399
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#define IP6_STAT_FASTFORWARD 400 /* packets fast forwarded */
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#define IP6_STAT_FASTFORWARDFLOWS 401 /* number of fast forward flows */
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#define IP6_NSTATS 402
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#define IP6FLOW_HASHBITS 6 /* should not be a multiple of 8 */
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/*
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* Structure for an IPv6 flow (ip6_fastforward).
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*/
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struct ip6flow {
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TAILQ_ENTRY(ip6flow) ip6f_list; /* next in active list */
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TAILQ_ENTRY(ip6flow) ip6f_hash; /* next ip6flow in bucket */
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size_t ip6f_hashidx; /* own hash index of ipflowtable[] */
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struct in6_addr ip6f_dst; /* destination address */
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struct in6_addr ip6f_src; /* source address */
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struct route ip6f_ro; /* associated route entry */
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u_int32_t ip6f_flow; /* flow (tos) */
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u_quad_t ip6f_uses; /* number of uses in this period */
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u_quad_t ip6f_last_uses; /* number of uses in last period */
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u_quad_t ip6f_dropped; /* ENOBUFS returned by if_output */
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u_quad_t ip6f_forwarded; /* packets forwarded */
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u_int ip6f_timer; /* lifetime timer */
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};
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#ifdef _KERNEL
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/*
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* Auxiliary attributes of incoming IPv6 packets, which is initialized when we
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* come into ip6_input().
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* XXX do not make it a kitchen sink!
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*/
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struct ip6aux {
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/* ip6.ip6_dst */
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struct in6_addr ip6a_src;
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uint32_t ip6a_scope_id;
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int ip6a_flags;
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};
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/* flags passed to ip6_output as last parameter */
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#define IPV6_UNSPECSRC 0x01 /* allow :: as the source address */
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#define IPV6_FORWARDING 0x02 /* most of IPv6 header exists */
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#define IPV6_MINMTU 0x04 /* use minimum MTU (IPV6_USE_MIN_MTU) */
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extern u_int32_t ip6_id; /* fragment identifier */
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extern int ip6_defhlim; /* default hop limit */
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extern int ip6_defmcasthlim; /* default multicast hop limit */
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extern int ip6_forwarding; /* act as router? */
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extern int ip6_sendredirect; /* send ICMPv6 redirect? */
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extern int ip6_forward_srcrt; /* forward src-routed? */
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extern int ip6_use_deprecated; /* allow deprecated addr as source */
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extern int ip6_rr_prune; /* router renumbering prefix
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* walk list every 5 sec. */
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extern int ip6_mcast_pmtu; /* enable pMTU discovery for multicast? */
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extern int ip6_v6only;
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extern int ip6_neighborgcthresh; /* Threshold # of NDP entries for GC */
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extern int ip6_maxifprefixes; /* Max acceptable prefixes via RA per IF */
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extern int ip6_maxifdefrouters; /* Max acceptable def routers via RA */
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extern int ip6_maxdynroutes; /* Max # of routes created via redirect */
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extern struct socket *ip6_mrouter; /* multicast routing daemon */
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extern int ip6_sendredirects; /* send IP redirects when forwarding? */
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extern int ip6_maxfragpackets; /* Maximum packets in reassembly queue */
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extern int ip6_maxfrags; /* Maximum fragments in reassembly queue */
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extern int ip6_sourcecheck; /* Verify source interface */
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extern int ip6_sourcecheck_interval; /* Interval between log messages */
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extern int ip6_accept_rtadv; /* Acts as a host not a router */
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extern int ip6_rtadv_maxroutes; /* maximum number of routes via rtadv */
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extern int ip6_keepfaith; /* Firewall Aided Internet Translator */
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extern int ip6_log_interval;
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extern time_t ip6_log_time;
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extern int ip6_hdrnestlimit; /* upper limit of # of extension headers */
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extern int ip6_dad_count; /* DupAddrDetectionTransmits */
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extern int ip6_auto_flowlabel;
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extern int ip6_auto_linklocal;
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extern int ip6_anonportmin; /* minimum ephemeral port */
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extern int ip6_anonportmax; /* maximum ephemeral port */
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extern int ip6_lowportmin; /* minimum reserved port */
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extern int ip6_lowportmax; /* maximum reserved port */
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extern int ip6_use_tempaddr; /* whether to use temporary addresses. */
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extern int ip6_prefer_tempaddr; /* whether to prefer temporary addresses
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in the source address selection */
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extern int ip6_use_defzone; /* whether to use the default scope zone
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when unspecified */
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#ifdef GATEWAY
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extern int ip6_maxflows; /* maximum amount of flows for ip6ff */
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extern int ip6_hashsize; /* size of hash table */
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#endif
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struct in6pcb;
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extern const struct pr_usrreqs rip6_usrreqs;
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int icmp6_ctloutput(int, struct socket *, struct sockopt *);
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struct mbuf;
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void ip6_init(void);
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void ip6_input(struct mbuf *, struct ifnet *);
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const struct ip6aux *ip6_getdstifaddr(struct mbuf *);
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void ip6_freepcbopts(struct ip6_pktopts *);
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void ip6_freemoptions(struct ip6_moptions *);
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int ip6_unknown_opt(u_int8_t *, struct mbuf *, int);
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u_int8_t *ip6_get_prevhdr(struct mbuf *, int);
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int ip6_nexthdr(struct mbuf *, int, int, int *);
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int ip6_lasthdr(struct mbuf *, int, int, int *);
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struct m_tag *ip6_addaux(struct mbuf *);
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struct m_tag *ip6_findaux(struct mbuf *);
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void ip6_delaux(struct mbuf *);
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struct ip6_hdr;
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int ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *);
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int ip6_hopopts_input(u_int32_t *, u_int32_t *, struct mbuf **, int *);
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void ip6_savecontrol(struct in6pcb *, struct mbuf **, struct ip6_hdr *,
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struct mbuf *);
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void ip6_notify_pmtu(struct in6pcb *, const struct sockaddr_in6 *,
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u_int32_t *);
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int ip6_sysctl(int *, u_int, void *, size_t *, void *, size_t);
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void ip6_forward(struct mbuf *, int);
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void ip6_mloopback(struct ifnet *, struct mbuf *,
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const struct sockaddr_in6 *);
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int ip6_output(struct mbuf *, struct ip6_pktopts *,
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struct route *, int,
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struct ip6_moptions *, struct socket *,
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struct ifnet **);
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int ip6_ctloutput(int, struct socket *, struct sockopt *);
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int ip6_raw_ctloutput(int, struct socket *, struct sockopt *);
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void ip6_initpktopts(struct ip6_pktopts *);
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int ip6_setpktopts(struct mbuf *, struct ip6_pktopts *,
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struct ip6_pktopts *, kauth_cred_t, int);
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void ip6_clearpktopts(struct ip6_pktopts *, int);
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struct ip6_pktopts *ip6_copypktopts(struct ip6_pktopts *, int);
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int ip6_optlen(struct in6pcb *);
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void ip6_statinc(u_int);
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int route6_input(struct mbuf **, int *, int);
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void frag6_init(void);
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int frag6_input(struct mbuf **, int *, int);
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int ip6_reass_packet(struct mbuf **, int);
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void frag6_slowtimo(void);
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void frag6_fasttimo(void);
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void frag6_drain(void);
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void frag6_drainstub(void);
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int ip6flow_init(int);
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void ip6flow_poolinit(void);
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struct ip6flow *ip6flow_reap(int);
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void ip6flow_create(struct route *, struct mbuf *);
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void ip6flow_slowtimo(void);
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int ip6flow_invalidate_all(int);
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void rip6_init(void);
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int rip6_input(struct mbuf **, int *, int);
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void *rip6_ctlinput(int, const struct sockaddr *, void *);
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int rip6_ctloutput(int, struct socket *, struct sockopt *);
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int rip6_output(struct mbuf *, struct socket *, struct sockaddr_in6 *,
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struct mbuf *);
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int rip6_attach(struct socket *, int);
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int rip6_usrreq(struct socket *,
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int, struct mbuf *, struct mbuf *, struct mbuf *, struct lwp *);
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int dest6_input(struct mbuf **, int *, int);
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int none_input(struct mbuf **, int *, int);
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struct route;
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int in6_selectsrc(struct sockaddr_in6 *, struct ip6_pktopts *,
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struct ip6_moptions *, struct route *, struct in6_addr *,
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struct ifnet **, struct psref *, struct in6_addr *);
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int in6_selectroute(struct sockaddr_in6 *, struct ip6_pktopts *,
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struct route **, struct rtentry **, bool);
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int ip6_get_membership(const struct sockopt *, struct ifnet **, void *,
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size_t);
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u_int32_t ip6_randomid(void);
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u_int32_t ip6_randomflowlabel(void);
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#endif /* _KERNEL */
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#endif /* !_NETINET6_IP6_VAR_H_ */
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