274579831b
Capsicum did not prevent certain privileged networking operations, specifically creation of raw sockets and network configuration ioctls. However, these facilities can be used to circumvent some of the restrictions that capability mode is supposed to enforce. Add capability mode checks to disallow network configuration ioctls and creation of sockets other than PF_LOCAL and SOCK_DGRAM/STREAM/SEQPACKET internet sockets. Reviewed by: oshogbo Discussed with: emaste Reported by: manu Sponsored by: The FreeBSD Foundation MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D29423
452 lines
17 KiB
C
452 lines
17 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1980, 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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* @(#)route.h 8.4 (Berkeley) 1/9/95
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* $FreeBSD$
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*/
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#ifndef _NET_ROUTE_H_
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#define _NET_ROUTE_H_
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#include <net/vnet.h>
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/*
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* Kernel resident routing tables.
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*
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* The routing tables are initialized when interface addresses
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* are set by making entries for all directly connected interfaces.
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*/
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/*
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* Struct route consiste of a destination address,
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* a route entry pointer, link-layer prepend data pointer along
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* with its length.
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*/
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struct route {
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struct nhop_object *ro_nh;
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struct llentry *ro_lle;
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/*
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* ro_prepend and ro_plen are only used for bpf to pass in a
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* preformed header. They are not cacheable.
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*/
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char *ro_prepend;
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uint16_t ro_plen;
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uint16_t ro_flags;
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uint16_t ro_mtu; /* saved ro_rt mtu */
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uint16_t spare;
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struct sockaddr ro_dst;
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};
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#define RT_L2_ME_BIT 2 /* dst L2 addr is our address */
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#define RT_MAY_LOOP_BIT 3 /* dst may require loop copy */
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#define RT_HAS_HEADER_BIT 4 /* mbuf already have its header prepended */
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#define RT_L2_ME (1 << RT_L2_ME_BIT) /* 0x0004 */
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#define RT_MAY_LOOP (1 << RT_MAY_LOOP_BIT) /* 0x0008 */
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#define RT_HAS_HEADER (1 << RT_HAS_HEADER_BIT) /* 0x0010 */
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#define RT_REJECT 0x0020 /* Destination is reject */
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#define RT_BLACKHOLE 0x0040 /* Destination is blackhole */
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#define RT_HAS_GW 0x0080 /* Destination has GW */
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#define RT_LLE_CACHE 0x0100 /* Cache link layer */
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struct rt_metrics {
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u_long rmx_locks; /* Kernel must leave these values alone */
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u_long rmx_mtu; /* MTU for this path */
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u_long rmx_hopcount; /* max hops expected */
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u_long rmx_expire; /* lifetime for route, e.g. redirect */
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u_long rmx_recvpipe; /* inbound delay-bandwidth product */
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u_long rmx_sendpipe; /* outbound delay-bandwidth product */
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u_long rmx_ssthresh; /* outbound gateway buffer limit */
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u_long rmx_rtt; /* estimated round trip time */
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u_long rmx_rttvar; /* estimated rtt variance */
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u_long rmx_pksent; /* packets sent using this route */
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u_long rmx_weight; /* route weight */
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u_long rmx_nhidx; /* route nexhop index */
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u_long rmx_filler[2]; /* will be used for T/TCP later */
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};
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/*
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* rmx_rtt and rmx_rttvar are stored as microseconds;
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* RTTTOPRHZ(rtt) converts to a value suitable for use
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* by a protocol slowtimo counter.
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*/
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#define RTM_RTTUNIT 1000000 /* units for rtt, rttvar, as units per sec */
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#define RTTTOPRHZ(r) ((r) / (RTM_RTTUNIT / PR_SLOWHZ))
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/* lle state is exported in rmx_state rt_metrics field */
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#define rmx_state rmx_weight
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/* default route weight */
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#define RT_DEFAULT_WEIGHT 1
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#define RT_MAX_WEIGHT 16777215 /* 3 bytes */
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/*
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* Keep a generation count of routing table, incremented on route addition,
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* so we can invalidate caches. This is accessed without a lock, as precision
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* is not required.
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*/
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typedef volatile u_int rt_gen_t; /* tree generation (for adds) */
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#define RT_GEN(fibnum, af) rt_tables_get_gen(fibnum, af)
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#define RT_DEFAULT_FIB 0 /* Explicitly mark fib=0 restricted cases */
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#define RT_ALL_FIBS -1 /* Announce event for every fib */
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#ifdef _KERNEL
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VNET_DECLARE(uint32_t, _rt_numfibs); /* number of existing route tables */
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#define V_rt_numfibs VNET(_rt_numfibs)
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/* temporary compat arg */
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#define rt_numfibs V_rt_numfibs
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VNET_DECLARE(u_int, rt_add_addr_allfibs); /* Announce interfaces to all fibs */
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#define V_rt_add_addr_allfibs VNET(rt_add_addr_allfibs)
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/* Calculate flowid for locally-originated packets */
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#define V_fib_hash_outbound VNET(fib_hash_outbound)
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VNET_DECLARE(u_int, fib_hash_outbound);
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/* Outbound flowid generation rules */
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#ifdef RSS
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#define fib4_calc_packet_hash xps_proto_software_hash_v4
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#define fib6_calc_packet_hash xps_proto_software_hash_v6
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#define CALC_FLOWID_OUTBOUND_SENDTO true
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#ifdef ROUTE_MPATH
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#define CALC_FLOWID_OUTBOUND V_fib_hash_outbound
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#else
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#define CALC_FLOWID_OUTBOUND false
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#endif
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#else /* !RSS */
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#define fib4_calc_packet_hash fib4_calc_software_hash
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#define fib6_calc_packet_hash fib6_calc_software_hash
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#ifdef ROUTE_MPATH
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#define CALC_FLOWID_OUTBOUND_SENDTO V_fib_hash_outbound
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#define CALC_FLOWID_OUTBOUND V_fib_hash_outbound
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#else
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#define CALC_FLOWID_OUTBOUND_SENDTO false
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#define CALC_FLOWID_OUTBOUND false
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#endif
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#endif /* RSS */
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#endif /* _KERNEL */
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/*
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* We distinguish between routes to hosts and routes to networks,
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* preferring the former if available. For each route we infer
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* the interface to use from the gateway address supplied when
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* the route was entered. Routes that forward packets through
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* gateways are marked so that the output routines know to address the
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* gateway rather than the ultimate destination.
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*/
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#define RTF_UP 0x1 /* route usable */
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#define RTF_GATEWAY 0x2 /* destination is a gateway */
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#define RTF_HOST 0x4 /* host entry (net otherwise) */
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#define RTF_REJECT 0x8 /* host or net unreachable */
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#define RTF_DYNAMIC 0x10 /* created dynamically (by redirect) */
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#define RTF_MODIFIED 0x20 /* modified dynamically (by redirect) */
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#define RTF_DONE 0x40 /* message confirmed */
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/* 0x80 unused, was RTF_DELCLONE */
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/* 0x100 unused, was RTF_CLONING */
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#define RTF_XRESOLVE 0x200 /* external daemon resolves name */
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#define RTF_LLINFO 0x400 /* DEPRECATED - exists ONLY for backward
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compatibility */
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#define RTF_LLDATA 0x400 /* used by apps to add/del L2 entries */
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#define RTF_STATIC 0x800 /* manually added */
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#define RTF_BLACKHOLE 0x1000 /* just discard pkts (during updates) */
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#define RTF_PROTO2 0x4000 /* protocol specific routing flag */
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#define RTF_PROTO1 0x8000 /* protocol specific routing flag */
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/* 0x10000 unused, was RTF_PRCLONING */
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/* 0x20000 unused, was RTF_WASCLONED */
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#define RTF_PROTO3 0x40000 /* protocol specific routing flag */
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#define RTF_FIXEDMTU 0x80000 /* MTU was explicitly specified */
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#define RTF_PINNED 0x100000 /* route is immutable */
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#define RTF_LOCAL 0x200000 /* route represents a local address */
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#define RTF_BROADCAST 0x400000 /* route represents a bcast address */
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#define RTF_MULTICAST 0x800000 /* route represents a mcast address */
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/* 0x8000000 and up unassigned */
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#define RTF_STICKY 0x10000000 /* always route dst->src */
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/* 0x40000000 unused, was RTF_RNH_LOCKED */
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#define RTF_GWFLAG_COMPAT 0x80000000 /* a compatibility bit for interacting
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with existing routing apps */
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/* Mask of RTF flags that are allowed to be modified by RTM_CHANGE. */
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#define RTF_FMASK \
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(RTF_PROTO1 | RTF_PROTO2 | RTF_PROTO3 | RTF_BLACKHOLE | \
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RTF_REJECT | RTF_STATIC | RTF_STICKY)
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/*
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* fib_ nexthop API flags.
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*/
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/* Consumer-visible nexthop info flags */
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#define NHF_MULTIPATH 0x0008 /* Nexhop is a nexthop group */
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#define NHF_REJECT 0x0010 /* RTF_REJECT */
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#define NHF_BLACKHOLE 0x0020 /* RTF_BLACKHOLE */
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#define NHF_REDIRECT 0x0040 /* RTF_DYNAMIC|RTF_MODIFIED */
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#define NHF_DEFAULT 0x0080 /* Default route */
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#define NHF_BROADCAST 0x0100 /* RTF_BROADCAST */
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#define NHF_GATEWAY 0x0200 /* RTF_GATEWAY */
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#define NHF_HOST 0x0400 /* RTF_HOST */
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/* Nexthop request flags */
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#define NHR_NONE 0x00 /* empty flags field */
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#define NHR_REF 0x01 /* reference nexhop */
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#define NHR_NODEFAULT 0x02 /* uRPF: do not consider default route */
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/* Control plane route request flags */
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#define NHR_COPY 0x100 /* Copy rte data */
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#define NHR_UNLOCKED 0x200 /* Do not lock table */
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/*
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* Routing statistics.
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*/
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struct rtstat {
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uint64_t rts_badredirect; /* bogus redirect calls */
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uint64_t rts_dynamic; /* routes created by redirects */
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uint64_t rts_newgateway; /* routes modified by redirects */
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uint64_t rts_unreach; /* lookups which failed */
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uint64_t rts_wildcard; /* lookups satisfied by a wildcard */
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uint64_t rts_nh_idx_alloc_failure; /* nexthop index alloc failure*/
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uint64_t rts_nh_alloc_failure; /* nexthop allocation failure*/
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uint64_t rts_add_failure; /* # of route addition failures */
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uint64_t rts_add_retry; /* # of route addition retries */
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uint64_t rts_del_failure; /* # of route deletion failure */
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uint64_t rts_del_retry; /* # of route deletion retries */
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};
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/*
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* Structures for routing messages.
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*/
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struct rt_msghdr {
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u_short rtm_msglen; /* to skip over non-understood messages */
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u_char rtm_version; /* future binary compatibility */
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u_char rtm_type; /* message type */
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u_short rtm_index; /* index for associated ifp */
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u_short _rtm_spare1;
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int rtm_flags; /* flags, incl. kern & message, e.g. DONE */
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int rtm_addrs; /* bitmask identifying sockaddrs in msg */
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pid_t rtm_pid; /* identify sender */
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int rtm_seq; /* for sender to identify action */
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int rtm_errno; /* why failed */
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int rtm_fmask; /* bitmask used in RTM_CHANGE message */
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u_long rtm_inits; /* which metrics we are initializing */
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struct rt_metrics rtm_rmx; /* metrics themselves */
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};
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#define RTM_VERSION 5 /* Up the ante and ignore older versions */
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/*
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* Message types.
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*
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* The format for each message is annotated below using the following
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* identifiers:
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*
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* (1) struct rt_msghdr
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* (2) struct ifa_msghdr
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* (3) struct if_msghdr
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* (4) struct ifma_msghdr
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* (5) struct if_announcemsghdr
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*
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*/
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#define RTM_ADD 0x1 /* (1) Add Route */
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#define RTM_DELETE 0x2 /* (1) Delete Route */
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#define RTM_CHANGE 0x3 /* (1) Change Metrics or flags */
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#define RTM_GET 0x4 /* (1) Report Metrics */
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#define RTM_LOSING 0x5 /* (1) Kernel Suspects Partitioning */
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#define RTM_REDIRECT 0x6 /* (1) Told to use different route */
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#define RTM_MISS 0x7 /* (1) Lookup failed on this address */
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#define RTM_LOCK 0x8 /* (1) fix specified metrics */
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/* 0x9 */
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/* 0xa */
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#define RTM_RESOLVE 0xb /* (1) req to resolve dst to LL addr */
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#define RTM_NEWADDR 0xc /* (2) address being added to iface */
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#define RTM_DELADDR 0xd /* (2) address being removed from iface */
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#define RTM_IFINFO 0xe /* (3) iface going up/down etc. */
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#define RTM_NEWMADDR 0xf /* (4) mcast group membership being added to if */
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#define RTM_DELMADDR 0x10 /* (4) mcast group membership being deleted */
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#define RTM_IFANNOUNCE 0x11 /* (5) iface arrival/departure */
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#define RTM_IEEE80211 0x12 /* (5) IEEE80211 wireless event */
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/*
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* Bitmask values for rtm_inits and rmx_locks.
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*/
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#define RTV_MTU 0x1 /* init or lock _mtu */
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#define RTV_HOPCOUNT 0x2 /* init or lock _hopcount */
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#define RTV_EXPIRE 0x4 /* init or lock _expire */
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#define RTV_RPIPE 0x8 /* init or lock _recvpipe */
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#define RTV_SPIPE 0x10 /* init or lock _sendpipe */
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#define RTV_SSTHRESH 0x20 /* init or lock _ssthresh */
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#define RTV_RTT 0x40 /* init or lock _rtt */
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#define RTV_RTTVAR 0x80 /* init or lock _rttvar */
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#define RTV_WEIGHT 0x100 /* init or lock _weight */
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/*
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* Bitmask values for rtm_addrs.
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*/
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#define RTA_DST 0x1 /* destination sockaddr present */
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#define RTA_GATEWAY 0x2 /* gateway sockaddr present */
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#define RTA_NETMASK 0x4 /* netmask sockaddr present */
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#define RTA_GENMASK 0x8 /* cloning mask sockaddr present */
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#define RTA_IFP 0x10 /* interface name sockaddr present */
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#define RTA_IFA 0x20 /* interface addr sockaddr present */
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#define RTA_AUTHOR 0x40 /* sockaddr for author of redirect */
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#define RTA_BRD 0x80 /* for NEWADDR, broadcast or p-p dest addr */
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/*
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* Index offsets for sockaddr array for alternate internal encoding.
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*/
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#define RTAX_DST 0 /* destination sockaddr present */
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#define RTAX_GATEWAY 1 /* gateway sockaddr present */
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#define RTAX_NETMASK 2 /* netmask sockaddr present */
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#define RTAX_GENMASK 3 /* cloning mask sockaddr present */
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#define RTAX_IFP 4 /* interface name sockaddr present */
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#define RTAX_IFA 5 /* interface addr sockaddr present */
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#define RTAX_AUTHOR 6 /* sockaddr for author of redirect */
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#define RTAX_BRD 7 /* for NEWADDR, broadcast or p-p dest addr */
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#define RTAX_MAX 8 /* size of array to allocate */
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struct rtentry;
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struct nhop_object;
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typedef int rib_filter_f_t(const struct rtentry *, const struct nhop_object *,
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void *);
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struct rt_addrinfo {
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int rti_addrs; /* Route RTF_ flags */
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int rti_flags; /* Route RTF_ flags */
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struct sockaddr *rti_info[RTAX_MAX]; /* Sockaddr data */
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struct ifaddr *rti_ifa; /* value of rt_ifa addr */
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struct ifnet *rti_ifp; /* route interface */
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rib_filter_f_t *rti_filter; /* filter function */
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void *rti_filterdata; /* filter paramenters */
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u_long rti_mflags; /* metrics RTV_ flags */
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u_long rti_spare; /* Will be used for fib */
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struct rt_metrics *rti_rmx; /* Pointer to route metrics */
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};
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/*
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* This macro returns the size of a struct sockaddr when passed
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* through a routing socket. Basically we round up sa_len to
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* a multiple of sizeof(long), with a minimum of sizeof(long).
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* The case sa_len == 0 should only apply to empty structures.
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*/
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#define SA_SIZE(sa) \
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( (((struct sockaddr *)(sa))->sa_len == 0) ? \
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sizeof(long) : \
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1 + ( (((struct sockaddr *)(sa))->sa_len - 1) | (sizeof(long) - 1) ) )
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#define sa_equal(a, b) ( \
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(((const struct sockaddr *)(a))->sa_len == ((const struct sockaddr *)(b))->sa_len) && \
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(bcmp((a), (b), ((const struct sockaddr *)(b))->sa_len) == 0))
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#ifdef _KERNEL
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#define RT_LINK_IS_UP(ifp) (!((ifp)->if_capabilities & IFCAP_LINKSTATE) \
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|| (ifp)->if_link_state == LINK_STATE_UP)
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#define RO_NHFREE(_ro) do { \
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if ((_ro)->ro_nh) { \
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NH_FREE((_ro)->ro_nh); \
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(_ro)->ro_nh = NULL; \
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} \
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} while (0)
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#define RO_INVALIDATE_CACHE(ro) do { \
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if ((ro)->ro_lle != NULL) { \
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LLE_FREE((ro)->ro_lle); \
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(ro)->ro_lle = NULL; \
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} \
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if ((ro)->ro_nh != NULL) { \
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NH_FREE((ro)->ro_nh); \
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(ro)->ro_nh = NULL; \
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} \
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} while (0)
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/*
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* Validate a cached route based on a supplied cookie. If there is an
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* out-of-date cache, simply free it. Update the generation number
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* for the new allocation
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*/
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#define NH_VALIDATE(ro, cookiep, fibnum) do { \
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rt_gen_t cookie = RT_GEN(fibnum, (ro)->ro_dst.sa_family); \
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if (*(cookiep) != cookie) { \
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RO_INVALIDATE_CACHE(ro); \
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*(cookiep) = cookie; \
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} \
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} while (0)
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struct ifmultiaddr;
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struct rib_head;
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void rt_ieee80211msg(struct ifnet *, int, void *, size_t);
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void rt_ifannouncemsg(struct ifnet *, int);
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void rt_ifmsg(struct ifnet *);
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void rt_missmsg(int, struct rt_addrinfo *, int, int);
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void rt_missmsg_fib(int, struct rt_addrinfo *, int, int, int);
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int rt_addrmsg(int, struct ifaddr *, int);
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int rt_routemsg(int, struct rtentry *, struct nhop_object *, int);
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int rt_routemsg_info(int, struct rt_addrinfo *, int);
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void rt_newmaddrmsg(int, struct ifmultiaddr *);
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void rt_maskedcopy(struct sockaddr *, struct sockaddr *, struct sockaddr *);
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struct rib_head *rt_table_init(int, int, u_int);
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void rt_table_destroy(struct rib_head *);
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u_int rt_tables_get_gen(uint32_t table, sa_family_t family);
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struct sockaddr *rtsock_fix_netmask(const struct sockaddr *dst,
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const struct sockaddr *smask, struct sockaddr_storage *dmask);
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void rt_updatemtu(struct ifnet *);
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void rt_flushifroutes(struct ifnet *ifp);
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struct thread;
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/* XXX MRT NEW VERSIONS THAT USE FIBs
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* For now the protocol indepedent versions are the same as the AF_INET ones
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* but this will change..
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*/
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int rtioctl_fib(u_long, caddr_t, u_int, struct thread *);
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int rib_lookup_info(uint32_t, const struct sockaddr *, uint32_t, uint32_t,
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struct rt_addrinfo *);
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void rib_free_info(struct rt_addrinfo *info);
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/* New API */
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void rib_flush_routes_family(int family);
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struct nhop_object *rib_lookup(uint32_t fibnum, const struct sockaddr *dst,
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uint32_t flags, uint32_t flowid);
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#endif
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#endif
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