e7ccc85b8f
the "sockarg" ipfw option matches packets associated to a local socket and with a non-zero so_user_cookie value. The value is made available as tablearg, so it can be used as a skipto target or pipe number in ipfw/dummynet rules. Code by Paul Joe, manpage by me. Submitted by: Paul Joe MFC after: 1 week
583 lines
18 KiB
C
583 lines
18 KiB
C
/*-
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* Copyright (c) 2002-2009 Luigi Rizzo, Universita` di Pisa
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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* $FreeBSD$
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*/
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#ifndef _IPFW2_H
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#define _IPFW2_H
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/*
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* The default rule number. By the design of ip_fw, the default rule
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* is the last one, so its number can also serve as the highest number
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* allowed for a rule. The ip_fw code relies on both meanings of this
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* constant.
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*/
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#define IPFW_DEFAULT_RULE 65535
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/*
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* The number of ipfw tables. The maximum allowed table number is the
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* (IPFW_TABLES_MAX - 1).
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*/
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#define IPFW_TABLES_MAX 128
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/*
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* Most commands (queue, pipe, tag, untag, limit...) can have a 16-bit
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* argument between 1 and 65534. The value 0 is unused, the value
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* 65535 (IP_FW_TABLEARG) is used to represent 'tablearg', i.e. the
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* can be 1..65534, or 65535 to indicate the use of a 'tablearg'
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* result of the most recent table() lookup.
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* Note that 16bit is only a historical limit, resulting from
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* the use of a 16-bit fields for that value. In reality, we can have
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* 2^32 pipes, queues, tag values and so on, and use 0 as a tablearg.
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*/
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#define IPFW_ARG_MIN 1
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#define IPFW_ARG_MAX 65534
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#define IP_FW_TABLEARG 65535 /* XXX should use 0 */
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/*
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* The kernel representation of ipfw rules is made of a list of
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* 'instructions' (for all practical purposes equivalent to BPF
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* instructions), which specify which fields of the packet
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* (or its metadata) should be analysed.
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*
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* Each instruction is stored in a structure which begins with
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* "ipfw_insn", and can contain extra fields depending on the
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* instruction type (listed below).
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* Note that the code is written so that individual instructions
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* have a size which is a multiple of 32 bits. This means that, if
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* such structures contain pointers or other 64-bit entities,
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* (there is just one instance now) they may end up unaligned on
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* 64-bit architectures, so the must be handled with care.
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*
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* "enum ipfw_opcodes" are the opcodes supported. We can have up
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* to 256 different opcodes. When adding new opcodes, they should
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* be appended to the end of the opcode list before O_LAST_OPCODE,
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* this will prevent the ABI from being broken, otherwise users
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* will have to recompile ipfw(8) when they update the kernel.
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*/
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enum ipfw_opcodes { /* arguments (4 byte each) */
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O_NOP,
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O_IP_SRC, /* u32 = IP */
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O_IP_SRC_MASK, /* ip = IP/mask */
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O_IP_SRC_ME, /* none */
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O_IP_SRC_SET, /* u32=base, arg1=len, bitmap */
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O_IP_DST, /* u32 = IP */
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O_IP_DST_MASK, /* ip = IP/mask */
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O_IP_DST_ME, /* none */
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O_IP_DST_SET, /* u32=base, arg1=len, bitmap */
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O_IP_SRCPORT, /* (n)port list:mask 4 byte ea */
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O_IP_DSTPORT, /* (n)port list:mask 4 byte ea */
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O_PROTO, /* arg1=protocol */
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O_MACADDR2, /* 2 mac addr:mask */
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O_MAC_TYPE, /* same as srcport */
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O_LAYER2, /* none */
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O_IN, /* none */
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O_FRAG, /* none */
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O_RECV, /* none */
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O_XMIT, /* none */
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O_VIA, /* none */
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O_IPOPT, /* arg1 = 2*u8 bitmap */
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O_IPLEN, /* arg1 = len */
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O_IPID, /* arg1 = id */
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O_IPTOS, /* arg1 = id */
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O_IPPRECEDENCE, /* arg1 = precedence << 5 */
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O_IPTTL, /* arg1 = TTL */
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O_IPVER, /* arg1 = version */
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O_UID, /* u32 = id */
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O_GID, /* u32 = id */
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O_ESTAB, /* none (tcp established) */
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O_TCPFLAGS, /* arg1 = 2*u8 bitmap */
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O_TCPWIN, /* arg1 = desired win */
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O_TCPSEQ, /* u32 = desired seq. */
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O_TCPACK, /* u32 = desired seq. */
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O_ICMPTYPE, /* u32 = icmp bitmap */
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O_TCPOPTS, /* arg1 = 2*u8 bitmap */
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O_VERREVPATH, /* none */
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O_VERSRCREACH, /* none */
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O_PROBE_STATE, /* none */
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O_KEEP_STATE, /* none */
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O_LIMIT, /* ipfw_insn_limit */
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O_LIMIT_PARENT, /* dyn_type, not an opcode. */
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/*
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* These are really 'actions'.
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*/
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O_LOG, /* ipfw_insn_log */
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O_PROB, /* u32 = match probability */
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O_CHECK_STATE, /* none */
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O_ACCEPT, /* none */
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O_DENY, /* none */
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O_REJECT, /* arg1=icmp arg (same as deny) */
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O_COUNT, /* none */
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O_SKIPTO, /* arg1=next rule number */
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O_PIPE, /* arg1=pipe number */
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O_QUEUE, /* arg1=queue number */
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O_DIVERT, /* arg1=port number */
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O_TEE, /* arg1=port number */
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O_FORWARD_IP, /* fwd sockaddr */
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O_FORWARD_MAC, /* fwd mac */
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O_NAT, /* nope */
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O_REASS, /* none */
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/*
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* More opcodes.
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*/
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O_IPSEC, /* has ipsec history */
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O_IP_SRC_LOOKUP, /* arg1=table number, u32=value */
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O_IP_DST_LOOKUP, /* arg1=table number, u32=value */
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O_ANTISPOOF, /* none */
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O_JAIL, /* u32 = id */
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O_ALTQ, /* u32 = altq classif. qid */
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O_DIVERTED, /* arg1=bitmap (1:loop, 2:out) */
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O_TCPDATALEN, /* arg1 = tcp data len */
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O_IP6_SRC, /* address without mask */
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O_IP6_SRC_ME, /* my addresses */
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O_IP6_SRC_MASK, /* address with the mask */
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O_IP6_DST,
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O_IP6_DST_ME,
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O_IP6_DST_MASK,
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O_FLOW6ID, /* for flow id tag in the ipv6 pkt */
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O_ICMP6TYPE, /* icmp6 packet type filtering */
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O_EXT_HDR, /* filtering for ipv6 extension header */
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O_IP6,
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/*
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* actions for ng_ipfw
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*/
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O_NETGRAPH, /* send to ng_ipfw */
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O_NGTEE, /* copy to ng_ipfw */
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O_IP4,
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O_UNREACH6, /* arg1=icmpv6 code arg (deny) */
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O_TAG, /* arg1=tag number */
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O_TAGGED, /* arg1=tag number */
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O_SETFIB, /* arg1=FIB number */
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O_FIB, /* arg1=FIB desired fib number */
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O_SOCKARG, /* socket argument */
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O_LAST_OPCODE /* not an opcode! */
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};
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/*
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* The extension header are filtered only for presence using a bit
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* vector with a flag for each header.
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*/
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#define EXT_FRAGMENT 0x1
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#define EXT_HOPOPTS 0x2
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#define EXT_ROUTING 0x4
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#define EXT_AH 0x8
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#define EXT_ESP 0x10
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#define EXT_DSTOPTS 0x20
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#define EXT_RTHDR0 0x40
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#define EXT_RTHDR2 0x80
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/*
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* Template for instructions.
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*
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* ipfw_insn is used for all instructions which require no operands,
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* a single 16-bit value (arg1), or a couple of 8-bit values.
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*
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* For other instructions which require different/larger arguments
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* we have derived structures, ipfw_insn_*.
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*
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* The size of the instruction (in 32-bit words) is in the low
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* 6 bits of "len". The 2 remaining bits are used to implement
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* NOT and OR on individual instructions. Given a type, you can
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* compute the length to be put in "len" using F_INSN_SIZE(t)
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*
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* F_NOT negates the match result of the instruction.
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*
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* F_OR is used to build or blocks. By default, instructions
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* are evaluated as part of a logical AND. An "or" block
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* { X or Y or Z } contains F_OR set in all but the last
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* instruction of the block. A match will cause the code
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* to skip past the last instruction of the block.
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*
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* NOTA BENE: in a couple of places we assume that
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* sizeof(ipfw_insn) == sizeof(u_int32_t)
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* this needs to be fixed.
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*
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*/
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typedef struct _ipfw_insn { /* template for instructions */
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u_int8_t opcode;
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u_int8_t len; /* number of 32-bit words */
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#define F_NOT 0x80
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#define F_OR 0x40
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#define F_LEN_MASK 0x3f
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#define F_LEN(cmd) ((cmd)->len & F_LEN_MASK)
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u_int16_t arg1;
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} ipfw_insn;
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/*
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* The F_INSN_SIZE(type) computes the size, in 4-byte words, of
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* a given type.
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*/
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#define F_INSN_SIZE(t) ((sizeof (t))/sizeof(u_int32_t))
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/*
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* This is used to store an array of 16-bit entries (ports etc.)
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*/
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typedef struct _ipfw_insn_u16 {
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ipfw_insn o;
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u_int16_t ports[2]; /* there may be more */
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} ipfw_insn_u16;
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/*
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* This is used to store an array of 32-bit entries
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* (uid, single IPv4 addresses etc.)
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*/
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typedef struct _ipfw_insn_u32 {
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ipfw_insn o;
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u_int32_t d[1]; /* one or more */
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} ipfw_insn_u32;
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/*
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* This is used to store IP addr-mask pairs.
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*/
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typedef struct _ipfw_insn_ip {
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ipfw_insn o;
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struct in_addr addr;
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struct in_addr mask;
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} ipfw_insn_ip;
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/*
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* This is used to forward to a given address (ip).
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*/
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typedef struct _ipfw_insn_sa {
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ipfw_insn o;
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struct sockaddr_in sa;
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} ipfw_insn_sa;
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/*
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* This is used for MAC addr-mask pairs.
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*/
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typedef struct _ipfw_insn_mac {
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ipfw_insn o;
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u_char addr[12]; /* dst[6] + src[6] */
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u_char mask[12]; /* dst[6] + src[6] */
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} ipfw_insn_mac;
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/*
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* This is used for interface match rules (recv xx, xmit xx).
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*/
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typedef struct _ipfw_insn_if {
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ipfw_insn o;
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union {
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struct in_addr ip;
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int glob;
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} p;
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char name[IFNAMSIZ];
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} ipfw_insn_if;
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/*
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* This is used for storing an altq queue id number.
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*/
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typedef struct _ipfw_insn_altq {
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ipfw_insn o;
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u_int32_t qid;
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} ipfw_insn_altq;
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/*
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* This is used for limit rules.
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*/
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typedef struct _ipfw_insn_limit {
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ipfw_insn o;
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u_int8_t _pad;
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u_int8_t limit_mask; /* combination of DYN_* below */
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#define DYN_SRC_ADDR 0x1
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#define DYN_SRC_PORT 0x2
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#define DYN_DST_ADDR 0x4
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#define DYN_DST_PORT 0x8
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u_int16_t conn_limit;
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} ipfw_insn_limit;
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/*
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* This is used for log instructions.
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*/
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typedef struct _ipfw_insn_log {
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ipfw_insn o;
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u_int32_t max_log; /* how many do we log -- 0 = all */
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u_int32_t log_left; /* how many left to log */
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} ipfw_insn_log;
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/*
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* Data structures required by both ipfw(8) and ipfw(4) but not part of the
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* management API are protected by IPFW_INTERNAL.
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*/
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#ifdef IPFW_INTERNAL
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/* Server pool support (LSNAT). */
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struct cfg_spool {
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LIST_ENTRY(cfg_spool) _next; /* chain of spool instances */
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struct in_addr addr;
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u_short port;
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};
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#endif
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/* Redirect modes id. */
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#define REDIR_ADDR 0x01
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#define REDIR_PORT 0x02
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#define REDIR_PROTO 0x04
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#ifdef IPFW_INTERNAL
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/* Nat redirect configuration. */
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struct cfg_redir {
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LIST_ENTRY(cfg_redir) _next; /* chain of redir instances */
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u_int16_t mode; /* type of redirect mode */
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struct in_addr laddr; /* local ip address */
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struct in_addr paddr; /* public ip address */
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struct in_addr raddr; /* remote ip address */
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u_short lport; /* local port */
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u_short pport; /* public port */
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u_short rport; /* remote port */
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u_short pport_cnt; /* number of public ports */
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u_short rport_cnt; /* number of remote ports */
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int proto; /* protocol: tcp/udp */
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struct alias_link **alink;
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/* num of entry in spool chain */
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u_int16_t spool_cnt;
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/* chain of spool instances */
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LIST_HEAD(spool_chain, cfg_spool) spool_chain;
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};
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#endif
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#define NAT_BUF_LEN 1024
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#ifdef IPFW_INTERNAL
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/* Nat configuration data struct. */
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struct cfg_nat {
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/* chain of nat instances */
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LIST_ENTRY(cfg_nat) _next;
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int id; /* nat id */
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struct in_addr ip; /* nat ip address */
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char if_name[IF_NAMESIZE]; /* interface name */
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int mode; /* aliasing mode */
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struct libalias *lib; /* libalias instance */
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/* number of entry in spool chain */
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int redir_cnt;
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/* chain of redir instances */
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LIST_HEAD(redir_chain, cfg_redir) redir_chain;
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};
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#endif
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#define SOF_NAT sizeof(struct cfg_nat)
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#define SOF_REDIR sizeof(struct cfg_redir)
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#define SOF_SPOOL sizeof(struct cfg_spool)
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/* Nat command. */
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typedef struct _ipfw_insn_nat {
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ipfw_insn o;
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struct cfg_nat *nat;
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} ipfw_insn_nat;
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/* Apply ipv6 mask on ipv6 addr */
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#define APPLY_MASK(addr,mask) \
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(addr)->__u6_addr.__u6_addr32[0] &= (mask)->__u6_addr.__u6_addr32[0]; \
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(addr)->__u6_addr.__u6_addr32[1] &= (mask)->__u6_addr.__u6_addr32[1]; \
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(addr)->__u6_addr.__u6_addr32[2] &= (mask)->__u6_addr.__u6_addr32[2]; \
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(addr)->__u6_addr.__u6_addr32[3] &= (mask)->__u6_addr.__u6_addr32[3];
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/* Structure for ipv6 */
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typedef struct _ipfw_insn_ip6 {
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ipfw_insn o;
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struct in6_addr addr6;
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struct in6_addr mask6;
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} ipfw_insn_ip6;
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/* Used to support icmp6 types */
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typedef struct _ipfw_insn_icmp6 {
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ipfw_insn o;
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uint32_t d[7]; /* XXX This number si related to the netinet/icmp6.h
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* define ICMP6_MAXTYPE
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* as follows: n = ICMP6_MAXTYPE/32 + 1
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* Actually is 203
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*/
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} ipfw_insn_icmp6;
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/*
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* Here we have the structure representing an ipfw rule.
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*
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* It starts with a general area (with link fields and counters)
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* followed by an array of one or more instructions, which the code
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* accesses as an array of 32-bit values.
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*
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* Given a rule pointer r:
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*
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* r->cmd is the start of the first instruction.
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* ACTION_PTR(r) is the start of the first action (things to do
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* once a rule matched).
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*
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* When assembling instruction, remember the following:
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*
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* + if a rule has a "keep-state" (or "limit") option, then the
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* first instruction (at r->cmd) MUST BE an O_PROBE_STATE
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* + if a rule has a "log" option, then the first action
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* (at ACTION_PTR(r)) MUST be O_LOG
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* + if a rule has an "altq" option, it comes after "log"
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* + if a rule has an O_TAG option, it comes after "log" and "altq"
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*
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* NOTE: we use a simple linked list of rules because we never need
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* to delete a rule without scanning the list. We do not use
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* queue(3) macros for portability and readability.
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*/
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struct ip_fw {
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struct ip_fw *x_next; /* linked list of rules */
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struct ip_fw *next_rule; /* ptr to next [skipto] rule */
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/* 'next_rule' is used to pass up 'set_disable' status */
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uint16_t act_ofs; /* offset of action in 32-bit units */
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uint16_t cmd_len; /* # of 32-bit words in cmd */
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uint16_t rulenum; /* rule number */
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uint8_t set; /* rule set (0..31) */
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#define RESVD_SET 31 /* set for default and persistent rules */
|
|
uint8_t _pad; /* padding */
|
|
uint32_t id; /* rule id */
|
|
|
|
/* These fields are present in all rules. */
|
|
uint64_t pcnt; /* Packet counter */
|
|
uint64_t bcnt; /* Byte counter */
|
|
uint32_t timestamp; /* tv_sec of last match */
|
|
|
|
ipfw_insn cmd[1]; /* storage for commands */
|
|
};
|
|
|
|
#define ACTION_PTR(rule) \
|
|
(ipfw_insn *)( (u_int32_t *)((rule)->cmd) + ((rule)->act_ofs) )
|
|
|
|
#define RULESIZE(rule) (sizeof(struct ip_fw) + \
|
|
((struct ip_fw *)(rule))->cmd_len * 4 - 4)
|
|
|
|
#if 1 // should be moved to in.h
|
|
/*
|
|
* This structure is used as a flow mask and a flow id for various
|
|
* parts of the code.
|
|
* addr_type is used in userland and kernel to mark the address type.
|
|
* fib is used in the kernel to record the fib in use.
|
|
* _flags is used in the kernel to store tcp flags for dynamic rules.
|
|
*/
|
|
struct ipfw_flow_id {
|
|
uint32_t dst_ip;
|
|
uint32_t src_ip;
|
|
uint16_t dst_port;
|
|
uint16_t src_port;
|
|
uint8_t fib;
|
|
uint8_t proto;
|
|
uint8_t _flags; /* protocol-specific flags */
|
|
uint8_t addr_type; /* 4=ip4, 6=ip6, 1=ether ? */
|
|
struct in6_addr dst_ip6;
|
|
struct in6_addr src_ip6;
|
|
uint32_t flow_id6;
|
|
uint32_t extra; /* queue/pipe or frag_id */
|
|
};
|
|
#endif
|
|
|
|
#define IS_IP6_FLOW_ID(id) ((id)->addr_type == 6)
|
|
|
|
/*
|
|
* Dynamic ipfw rule.
|
|
*/
|
|
typedef struct _ipfw_dyn_rule ipfw_dyn_rule;
|
|
|
|
struct _ipfw_dyn_rule {
|
|
ipfw_dyn_rule *next; /* linked list of rules. */
|
|
struct ip_fw *rule; /* pointer to rule */
|
|
/* 'rule' is used to pass up the rule number (from the parent) */
|
|
|
|
ipfw_dyn_rule *parent; /* pointer to parent rule */
|
|
u_int64_t pcnt; /* packet match counter */
|
|
u_int64_t bcnt; /* byte match counter */
|
|
struct ipfw_flow_id id; /* (masked) flow id */
|
|
u_int32_t expire; /* expire time */
|
|
u_int32_t bucket; /* which bucket in hash table */
|
|
u_int32_t state; /* state of this rule (typically a
|
|
* combination of TCP flags)
|
|
*/
|
|
u_int32_t ack_fwd; /* most recent ACKs in forward */
|
|
u_int32_t ack_rev; /* and reverse directions (used */
|
|
/* to generate keepalives) */
|
|
u_int16_t dyn_type; /* rule type */
|
|
u_int16_t count; /* refcount */
|
|
};
|
|
|
|
/*
|
|
* Definitions for IP option names.
|
|
*/
|
|
#define IP_FW_IPOPT_LSRR 0x01
|
|
#define IP_FW_IPOPT_SSRR 0x02
|
|
#define IP_FW_IPOPT_RR 0x04
|
|
#define IP_FW_IPOPT_TS 0x08
|
|
|
|
/*
|
|
* Definitions for TCP option names.
|
|
*/
|
|
#define IP_FW_TCPOPT_MSS 0x01
|
|
#define IP_FW_TCPOPT_WINDOW 0x02
|
|
#define IP_FW_TCPOPT_SACK 0x04
|
|
#define IP_FW_TCPOPT_TS 0x08
|
|
#define IP_FW_TCPOPT_CC 0x10
|
|
|
|
#define ICMP_REJECT_RST 0x100 /* fake ICMP code (send a TCP RST) */
|
|
#define ICMP6_UNREACH_RST 0x100 /* fake ICMPv6 code (send a TCP RST) */
|
|
|
|
/*
|
|
* These are used for lookup tables.
|
|
*/
|
|
typedef struct _ipfw_table_entry {
|
|
in_addr_t addr; /* network address */
|
|
u_int32_t value; /* value */
|
|
u_int16_t tbl; /* table number */
|
|
u_int8_t masklen; /* mask length */
|
|
} ipfw_table_entry;
|
|
|
|
typedef struct _ipfw_table {
|
|
u_int32_t size; /* size of entries in bytes */
|
|
u_int32_t cnt; /* # of entries */
|
|
u_int16_t tbl; /* table number */
|
|
ipfw_table_entry ent[0]; /* entries */
|
|
} ipfw_table;
|
|
|
|
#endif /* _IPFW2_H */
|