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freebsd-nq/sys/netinet6/ip6_var.h
Jonathan T. Looney 1e9f3b734e Implement a limit on on the number of IPv6 reassembly queues per bucket. 
There is a hashing algorithm which should distribute IPv6 reassembly
queues across the available buckets in a relatively even way. However,
if there is a flaw in the hashing algorithm which allows a large number
of IPv6 fragment reassembly queues to end up in a single bucket, a per-
bucket limit could help mitigate the performance impact of this flaw.

Implement such a limit, with a default of twice the maximum number of
reassembly queues divided by the number of buckets. Recalculate the
limit any time the maximum number of reassembly queues changes.
However, allow the user to override the value using a sysctl
(net.inet6.ip6.maxfragbucketsize).

Reviewed by:	jhb
Security:	FreeBSD-SA-18:10.ip
Security:	CVE-2018-6923
2018-08-14 17:27:41 +00:00

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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $KAME: ip6_var.h,v 1.62 2001/05/03 14:51:48 itojun Exp $
*/
/*-
* Copyright (c) 1982, 1986, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)ip_var.h 8.1 (Berkeley) 6/10/93
* $FreeBSD$
*/
#ifndef _NETINET6_IP6_VAR_H_
#define _NETINET6_IP6_VAR_H_
#include <sys/epoch.h>
/*
* IP6 reassembly queue structure. Each fragment
* being reassembled is attached to one of these structures.
*/
struct ip6q {
struct ip6asfrag *ip6q_down;
struct ip6asfrag *ip6q_up;
u_int32_t ip6q_ident;
u_int8_t ip6q_nxt;
u_int8_t ip6q_ecn;
u_int8_t ip6q_ttl;
struct in6_addr ip6q_src, ip6q_dst;
struct ip6q *ip6q_next;
struct ip6q *ip6q_prev;
int ip6q_unfrglen; /* len of unfragmentable part */
#ifdef notyet
u_char *ip6q_nxtp;
#endif
int ip6q_nfrag; /* # of fragments */
struct label *ip6q_label;
};
struct ip6asfrag {
struct ip6asfrag *ip6af_down;
struct ip6asfrag *ip6af_up;
struct mbuf *ip6af_m;
int ip6af_offset; /* offset in ip6af_m to next header */
int ip6af_frglen; /* fragmentable part length */
int ip6af_off; /* fragment offset */
u_int16_t ip6af_mff; /* more fragment bit in frag off */
};
#define IP6_REASS_MBUF(ip6af) (*(struct mbuf **)&((ip6af)->ip6af_m))
/*
* IP6 reinjecting structure.
*/
struct ip6_direct_ctx {
uint32_t ip6dc_nxt; /* next header to process */
uint32_t ip6dc_off; /* offset to next header */
};
/*
* Structure attached to inpcb.in6p_moptions and
* passed to ip6_output when IPv6 multicast options are in use.
* This structure is lazy-allocated.
*/
struct ip6_moptions {
struct ifnet *im6o_multicast_ifp; /* ifp for outgoing multicasts */
u_char im6o_multicast_hlim; /* hoplimit for outgoing multicasts */
u_char im6o_multicast_loop; /* 1 >= hear sends if a member */
u_short im6o_num_memberships; /* no. memberships this socket */
u_short im6o_max_memberships; /* max memberships this socket */
struct in6_multi **im6o_membership; /* group memberships */
struct in6_mfilter *im6o_mfilters; /* source filters */
struct epoch_context imo6_epoch_ctx;
};
/*
* Control options for outgoing packets
*/
/* Routing header related info */
struct ip6po_rhinfo {
struct ip6_rthdr *ip6po_rhi_rthdr; /* Routing header */
struct route_in6 ip6po_rhi_route; /* Route to the 1st hop */
};
#define ip6po_rthdr ip6po_rhinfo.ip6po_rhi_rthdr
#define ip6po_route ip6po_rhinfo.ip6po_rhi_route
/* Nexthop related info */
struct ip6po_nhinfo {
struct sockaddr *ip6po_nhi_nexthop;
struct route_in6 ip6po_nhi_route; /* Route to the nexthop */
};
#define ip6po_nexthop ip6po_nhinfo.ip6po_nhi_nexthop
#define ip6po_nextroute ip6po_nhinfo.ip6po_nhi_route
struct ip6_pktopts {
struct mbuf *ip6po_m; /* Pointer to mbuf storing the data */
int ip6po_hlim; /* Hoplimit for outgoing packets */
/* Outgoing IF/address information */
struct in6_pktinfo *ip6po_pktinfo;
/* Next-hop address information */
struct ip6po_nhinfo ip6po_nhinfo;
struct ip6_hbh *ip6po_hbh; /* Hop-by-Hop options header */
/* Destination options header (before a routing header) */
struct ip6_dest *ip6po_dest1;
/* Routing header related info. */
struct ip6po_rhinfo ip6po_rhinfo;
/* Destination options header (after a routing header) */
struct ip6_dest *ip6po_dest2;
int ip6po_tclass; /* traffic class */
int ip6po_minmtu; /* fragment vs PMTU discovery policy */
#define IP6PO_MINMTU_MCASTONLY -1 /* default; send at min MTU for multicast*/
#define IP6PO_MINMTU_DISABLE 0 /* always perform pmtu disc */
#define IP6PO_MINMTU_ALL 1 /* always send at min MTU */
int ip6po_prefer_tempaddr; /* whether temporary addresses are
preferred as source address */
#define IP6PO_TEMPADDR_SYSTEM -1 /* follow the system default */
#define IP6PO_TEMPADDR_NOTPREFER 0 /* not prefer temporary address */
#define IP6PO_TEMPADDR_PREFER 1 /* prefer temporary address */
int ip6po_flags;
#if 0 /* parameters in this block is obsolete. do not reuse the values. */
#define IP6PO_REACHCONF 0x01 /* upper-layer reachability confirmation. */
#define IP6PO_MINMTU 0x02 /* use minimum MTU (IPV6_USE_MIN_MTU) */
#endif
#define IP6PO_DONTFRAG 0x04 /* disable fragmentation (IPV6_DONTFRAG) */
#define IP6PO_USECOA 0x08 /* use care of address */
};
/*
* Control options for incoming packets
*/
struct ip6stat {
uint64_t ip6s_total; /* total packets received */
uint64_t ip6s_tooshort; /* packet too short */
uint64_t ip6s_toosmall; /* not enough data */
uint64_t ip6s_fragments; /* fragments received */
uint64_t ip6s_fragdropped; /* frags dropped(dups, out of space) */
uint64_t ip6s_fragtimeout; /* fragments timed out */
uint64_t ip6s_fragoverflow; /* fragments that exceeded limit */
uint64_t ip6s_forward; /* packets forwarded */
uint64_t ip6s_cantforward; /* packets rcvd for unreachable dest */
uint64_t ip6s_redirectsent; /* packets forwarded on same net */
uint64_t ip6s_delivered; /* datagrams delivered to upper level*/
uint64_t ip6s_localout; /* total ip packets generated here */
uint64_t ip6s_odropped; /* lost packets due to nobufs, etc. */
uint64_t ip6s_reassembled; /* total packets reassembled ok */
uint64_t ip6s_fragmented; /* datagrams successfully fragmented */
uint64_t ip6s_ofragments; /* output fragments created */
uint64_t ip6s_cantfrag; /* don't fragment flag was set, etc. */
uint64_t ip6s_badoptions; /* error in option processing */
uint64_t ip6s_noroute; /* packets discarded due to no route */
uint64_t ip6s_badvers; /* ip6 version != 6 */
uint64_t ip6s_rawout; /* total raw ip packets generated */
uint64_t ip6s_badscope; /* scope error */
uint64_t ip6s_notmember; /* don't join this multicast group */
#define IP6S_HDRCNT 256 /* headers count */
uint64_t ip6s_nxthist[IP6S_HDRCNT]; /* next header history */
uint64_t ip6s_m1; /* one mbuf */
#define IP6S_M2MMAX 32
uint64_t ip6s_m2m[IP6S_M2MMAX]; /* two or more mbuf */
uint64_t ip6s_mext1; /* one ext mbuf */
uint64_t ip6s_mext2m; /* two or more ext mbuf */
uint64_t ip6s_exthdrtoolong; /* ext hdr are not contiguous */
uint64_t ip6s_nogif; /* no match gif found */
uint64_t ip6s_toomanyhdr; /* discarded due to too many headers */
/*
* statistics for improvement of the source address selection
* algorithm:
* XXX: hardcoded 16 = # of ip6 multicast scope types + 1
*/
#define IP6S_RULESMAX 16
#define IP6S_SCOPECNT 16
/* number of times that address selection fails */
uint64_t ip6s_sources_none;
/* number of times that an address on the outgoing I/F is chosen */
uint64_t ip6s_sources_sameif[IP6S_SCOPECNT];
/* number of times that an address on a non-outgoing I/F is chosen */
uint64_t ip6s_sources_otherif[IP6S_SCOPECNT];
/*
* number of times that an address that has the same scope
* from the destination is chosen.
*/
uint64_t ip6s_sources_samescope[IP6S_SCOPECNT];
/*
* number of times that an address that has a different scope
* from the destination is chosen.
*/
uint64_t ip6s_sources_otherscope[IP6S_SCOPECNT];
/* number of times that a deprecated address is chosen */
uint64_t ip6s_sources_deprecated[IP6S_SCOPECNT];
/* number of times that each rule of source selection is applied. */
uint64_t ip6s_sources_rule[IP6S_RULESMAX];
};
#ifdef _KERNEL
#include <sys/counter.h>
VNET_PCPUSTAT_DECLARE(struct ip6stat, ip6stat);
#define IP6STAT_ADD(name, val) \
VNET_PCPUSTAT_ADD(struct ip6stat, ip6stat, name, (val))
#define IP6STAT_SUB(name, val) IP6STAT_ADD(name, -(val))
#define IP6STAT_INC(name) IP6STAT_ADD(name, 1)
#define IP6STAT_DEC(name) IP6STAT_SUB(name, 1)
#endif
#ifdef _KERNEL
/* flags passed to ip6_output as last parameter */
#define IPV6_UNSPECSRC 0x01 /* allow :: as the source address */
#define IPV6_FORWARDING 0x02 /* most of IPv6 header exists */
#define IPV6_MINMTU 0x04 /* use minimum MTU (IPV6_USE_MIN_MTU) */
#ifdef __NO_STRICT_ALIGNMENT
#define IP6_HDR_ALIGNED_P(ip) 1
#else
#define IP6_HDR_ALIGNED_P(ip) ((((intptr_t) (ip)) & 3) == 0)
#endif
VNET_DECLARE(int, ip6_defhlim); /* default hop limit */
VNET_DECLARE(int, ip6_defmcasthlim); /* default multicast hop limit */
VNET_DECLARE(int, ip6_forwarding); /* act as router? */
VNET_DECLARE(int, ip6_use_deprecated); /* allow deprecated addr as source */
VNET_DECLARE(int, ip6_rr_prune); /* router renumbering prefix
* walk list every 5 sec. */
VNET_DECLARE(int, ip6_mcast_pmtu); /* enable pMTU discovery for multicast? */
VNET_DECLARE(int, ip6_v6only);
#define V_ip6_defhlim VNET(ip6_defhlim)
#define V_ip6_defmcasthlim VNET(ip6_defmcasthlim)
#define V_ip6_forwarding VNET(ip6_forwarding)
#define V_ip6_use_deprecated VNET(ip6_use_deprecated)
#define V_ip6_rr_prune VNET(ip6_rr_prune)
#define V_ip6_mcast_pmtu VNET(ip6_mcast_pmtu)
#define V_ip6_v6only VNET(ip6_v6only)
VNET_DECLARE(struct socket *, ip6_mrouter); /* multicast routing daemon */
VNET_DECLARE(int, ip6_sendredirects); /* send IP redirects when forwarding? */
VNET_DECLARE(int, ip6_maxfragpackets); /* Maximum packets in reassembly
* queue */
extern int ip6_maxfrags; /* Maximum fragments in reassembly
* queue */
VNET_DECLARE(int, ip6_maxfragbucketsize); /* Maximum reassembly queues per bucket */
VNET_DECLARE(int, ip6_maxfragsperpacket); /* Maximum fragments per packet */
VNET_DECLARE(int, ip6_accept_rtadv); /* Acts as a host not a router */
VNET_DECLARE(int, ip6_no_radr); /* No defroute from RA */
VNET_DECLARE(int, ip6_norbit_raif); /* Disable R-bit in NA on RA
* receiving IF. */
VNET_DECLARE(int, ip6_rfc6204w3); /* Accept defroute from RA even when
forwarding enabled */
VNET_DECLARE(int, ip6_log_interval);
VNET_DECLARE(time_t, ip6_log_time);
VNET_DECLARE(int, ip6_hdrnestlimit); /* upper limit of # of extension
* headers */
VNET_DECLARE(int, ip6_dad_count); /* DupAddrDetectionTransmits */
#define V_ip6_mrouter VNET(ip6_mrouter)
#define V_ip6_sendredirects VNET(ip6_sendredirects)
#define V_ip6_maxfragpackets VNET(ip6_maxfragpackets)
#define V_ip6_maxfragbucketsize VNET(ip6_maxfragbucketsize)
#define V_ip6_maxfragsperpacket VNET(ip6_maxfragsperpacket)
#define V_ip6_accept_rtadv VNET(ip6_accept_rtadv)
#define V_ip6_no_radr VNET(ip6_no_radr)
#define V_ip6_norbit_raif VNET(ip6_norbit_raif)
#define V_ip6_rfc6204w3 VNET(ip6_rfc6204w3)
#define V_ip6_log_interval VNET(ip6_log_interval)
#define V_ip6_log_time VNET(ip6_log_time)
#define V_ip6_hdrnestlimit VNET(ip6_hdrnestlimit)
#define V_ip6_dad_count VNET(ip6_dad_count)
VNET_DECLARE(int, ip6_auto_flowlabel);
VNET_DECLARE(int, ip6_auto_linklocal);
#define V_ip6_auto_flowlabel VNET(ip6_auto_flowlabel)
#define V_ip6_auto_linklocal VNET(ip6_auto_linklocal)
VNET_DECLARE(int, ip6_use_tempaddr); /* Whether to use temporary addresses */
VNET_DECLARE(int, ip6_prefer_tempaddr); /* Whether to prefer temporary
* addresses in the source address
* selection */
#define V_ip6_use_tempaddr VNET(ip6_use_tempaddr)
#define V_ip6_prefer_tempaddr VNET(ip6_prefer_tempaddr)
VNET_DECLARE(int, ip6_use_defzone); /* Whether to use the default scope
* zone when unspecified */
#define V_ip6_use_defzone VNET(ip6_use_defzone)
VNET_DECLARE (struct pfil_head, inet6_pfil_hook); /* packet filter hooks */
#define V_inet6_pfil_hook VNET(inet6_pfil_hook)
#ifdef IPSTEALTH
VNET_DECLARE(int, ip6stealth);
#define V_ip6stealth VNET(ip6stealth)
#endif
extern struct pr_usrreqs rip6_usrreqs;
struct sockopt;
struct inpcb;
int icmp6_ctloutput(struct socket *, struct sockopt *sopt);
struct in6_ifaddr;
void ip6_init(void);
int ip6proto_register(short);
int ip6proto_unregister(short);
void ip6_input(struct mbuf *);
void ip6_direct_input(struct mbuf *);
void ip6_freepcbopts(struct ip6_pktopts *);
int ip6_unknown_opt(u_int8_t *, struct mbuf *, int);
int ip6_get_prevhdr(const struct mbuf *, int);
int ip6_nexthdr(const struct mbuf *, int, int, int *);
int ip6_lasthdr(const struct mbuf *, int, int, int *);
extern int (*ip6_mforward)(struct ip6_hdr *, struct ifnet *,
struct mbuf *);
int ip6_process_hopopts(struct mbuf *, u_int8_t *, int, u_int32_t *,
u_int32_t *);
struct mbuf **ip6_savecontrol_v4(struct inpcb *, struct mbuf *,
struct mbuf **, int *);
void ip6_savecontrol(struct inpcb *, struct mbuf *, struct mbuf **);
void ip6_notify_pmtu(struct inpcb *, struct sockaddr_in6 *, u_int32_t);
int ip6_sysctl(int *, u_int, void *, size_t *, void *, size_t);
void ip6_forward(struct mbuf *, int);
void ip6_mloopback(struct ifnet *, struct mbuf *);
int ip6_output(struct mbuf *, struct ip6_pktopts *,
struct route_in6 *,
int,
struct ip6_moptions *, struct ifnet **,
struct inpcb *);
int ip6_ctloutput(struct socket *, struct sockopt *);
int ip6_raw_ctloutput(struct socket *, struct sockopt *);
void ip6_initpktopts(struct ip6_pktopts *);
int ip6_setpktopts(struct mbuf *, struct ip6_pktopts *,
struct ip6_pktopts *, struct ucred *, int);
void ip6_clearpktopts(struct ip6_pktopts *, int);
struct ip6_pktopts *ip6_copypktopts(struct ip6_pktopts *, int);
int ip6_optlen(struct inpcb *);
int ip6_deletefraghdr(struct mbuf *, int, int);
int ip6_fragment(struct ifnet *, struct mbuf *, int, u_char, int,
uint32_t);
int route6_input(struct mbuf **, int *, int);
void frag6_set_bucketsize(void);
void frag6_init(void);
int frag6_input(struct mbuf **, int *, int);
void frag6_slowtimo(void);
void frag6_drain(void);
void rip6_init(void);
int rip6_input(struct mbuf **, int *, int);
void rip6_ctlinput(int, struct sockaddr *, void *);
int rip6_ctloutput(struct socket *, struct sockopt *);
int rip6_output(struct mbuf *, struct socket *, ...);
int rip6_usrreq(struct socket *,
int, struct mbuf *, struct mbuf *, struct mbuf *, struct thread *);
int dest6_input(struct mbuf **, int *, int);
int none_input(struct mbuf **, int *, int);
int in6_selectsrc_socket(struct sockaddr_in6 *, struct ip6_pktopts *,
struct inpcb *, struct ucred *, int, struct in6_addr *, int *);
int in6_selectsrc_addr(uint32_t, const struct in6_addr *,
uint32_t, struct ifnet *, struct in6_addr *, int *);
int in6_selectroute(struct sockaddr_in6 *, struct ip6_pktopts *,
struct ip6_moptions *, struct route_in6 *, struct ifnet **,
struct rtentry **);
int in6_selectroute_fib(struct sockaddr_in6 *, struct ip6_pktopts *,
struct ip6_moptions *, struct route_in6 *, struct ifnet **,
struct rtentry **, u_int);
u_int32_t ip6_randomid(void);
u_int32_t ip6_randomflowlabel(void);
void in6_delayed_cksum(struct mbuf *m, uint32_t plen, u_short offset);
#endif /* _KERNEL */
#endif /* !_NETINET6_IP6_VAR_H_ */
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