| /*- |
| * Copyright (c) 2002-2009 Luigi Rizzo, Universita` di Pisa |
| * |
| * 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. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. |
| * |
| * $FreeBSD$ |
| */ |
| |
| #ifndef _IPFW2_H |
| #define _IPFW2_H |
| |
| /* |
| * The default rule number. By the design of ip_fw, the default rule |
| * is the last one, so its number can also serve as the highest number |
| * allowed for a rule. The ip_fw code relies on both meanings of this |
| * constant. |
| */ |
| #define IPFW_DEFAULT_RULE 65535 |
| |
| /* |
| * The number of ipfw tables. The maximum allowed table number is the |
| * (IPFW_TABLES_MAX - 1). |
| */ |
| #define IPFW_TABLES_MAX 128 |
| |
| /* |
| * Most commands (queue, pipe, tag, untag, limit...) can have a 16-bit |
| * argument between 1 and 65534. The value 0 is unused, the value |
| * 65535 (IP_FW_TABLEARG) is used to represent 'tablearg', i.e. the |
| * can be 1..65534, or 65535 to indicate the use of a 'tablearg' |
| * result of the most recent table() lookup. |
| * Note that 16bit is only a historical limit, resulting from |
| * the use of a 16-bit fields for that value. In reality, we can have |
| * 2^32 pipes, queues, tag values and so on, and use 0 as a tablearg. |
| */ |
| #define IPFW_ARG_MIN 1 |
| #define IPFW_ARG_MAX 65534 |
| #define IP_FW_TABLEARG 65535 /* XXX should use 0 */ |
| |
| /* |
| * The kernel representation of ipfw rules is made of a list of |
| * 'instructions' (for all practical purposes equivalent to BPF |
| * instructions), which specify which fields of the packet |
| * (or its metadata) should be analysed. |
| * |
| * Each instruction is stored in a structure which begins with |
| * "ipfw_insn", and can contain extra fields depending on the |
| * instruction type (listed below). |
| * Note that the code is written so that individual instructions |
| * have a size which is a multiple of 32 bits. This means that, if |
| * such structures contain pointers or other 64-bit entities, |
| * (there is just one instance now) they may end up unaligned on |
| * 64-bit architectures, so the must be handled with care. |
| * |
| * "enum ipfw_opcodes" are the opcodes supported. We can have up |
| * to 256 different opcodes. When adding new opcodes, they should |
| * be appended to the end of the opcode list before O_LAST_OPCODE, |
| * this will prevent the ABI from being broken, otherwise users |
| * will have to recompile ipfw(8) when they update the kernel. |
| */ |
| |
| enum ipfw_opcodes { /* arguments (4 byte each) */ |
| O_NOP, |
| |
| O_IP_SRC, /* u32 = IP */ |
| O_IP_SRC_MASK, /* ip = IP/mask */ |
| O_IP_SRC_ME, /* none */ |
| O_IP_SRC_SET, /* u32=base, arg1=len, bitmap */ |
| |
| O_IP_DST, /* u32 = IP */ |
| O_IP_DST_MASK, /* ip = IP/mask */ |
| O_IP_DST_ME, /* none */ |
| O_IP_DST_SET, /* u32=base, arg1=len, bitmap */ |
| |
| O_IP_SRCPORT, /* (n)port list:mask 4 byte ea */ |
| O_IP_DSTPORT, /* (n)port list:mask 4 byte ea */ |
| O_PROTO, /* arg1=protocol */ |
| |
| O_MACADDR2, /* 2 mac addr:mask */ |
| O_MAC_TYPE, /* same as srcport */ |
| |
| O_LAYER2, /* none */ |
| O_IN, /* none */ |
| O_FRAG, /* none */ |
| |
| O_RECV, /* none */ |
| O_XMIT, /* none */ |
| O_VIA, /* none */ |
| |
| O_IPOPT, /* arg1 = 2*u8 bitmap */ |
| O_IPLEN, /* arg1 = len */ |
| O_IPID, /* arg1 = id */ |
| |
| O_IPTOS, /* arg1 = id */ |
| O_IPPRECEDENCE, /* arg1 = precedence << 5 */ |
| O_IPTTL, /* arg1 = TTL */ |
| |
| O_IPVER, /* arg1 = version */ |
| O_UID, /* u32 = id */ |
| O_GID, /* u32 = id */ |
| O_ESTAB, /* none (tcp established) */ |
| O_TCPFLAGS, /* arg1 = 2*u8 bitmap */ |
| O_TCPWIN, /* arg1 = desired win */ |
| O_TCPSEQ, /* u32 = desired seq. */ |
| O_TCPACK, /* u32 = desired seq. */ |
| O_ICMPTYPE, /* u32 = icmp bitmap */ |
| O_TCPOPTS, /* arg1 = 2*u8 bitmap */ |
| |
| O_VERREVPATH, /* none */ |
| O_VERSRCREACH, /* none */ |
| |
| O_PROBE_STATE, /* none */ |
| O_KEEP_STATE, /* none */ |
| O_LIMIT, /* ipfw_insn_limit */ |
| O_LIMIT_PARENT, /* dyn_type, not an opcode. */ |
| |
| /* |
| * These are really 'actions'. |
| */ |
| |
| O_LOG, /* ipfw_insn_log */ |
| O_PROB, /* u32 = match probability */ |
| |
| O_CHECK_STATE, /* none */ |
| O_ACCEPT, /* none */ |
| O_DENY, /* none */ |
| O_REJECT, /* arg1=icmp arg (same as deny) */ |
| O_COUNT, /* none */ |
| O_SKIPTO, /* arg1=next rule number */ |
| O_PIPE, /* arg1=pipe number */ |
| O_QUEUE, /* arg1=queue number */ |
| O_DIVERT, /* arg1=port number */ |
| O_TEE, /* arg1=port number */ |
| O_FORWARD_IP, /* fwd sockaddr */ |
| O_FORWARD_MAC, /* fwd mac */ |
| O_NAT, /* nope */ |
| O_REASS, /* none */ |
| |
| /* |
| * More opcodes. |
| */ |
| O_IPSEC, /* has ipsec history */ |
| O_IP_SRC_LOOKUP, /* arg1=table number, u32=value */ |
| O_IP_DST_LOOKUP, /* arg1=table number, u32=value */ |
| O_ANTISPOOF, /* none */ |
| O_JAIL, /* u32 = id */ |
| O_ALTQ, /* u32 = altq classif. qid */ |
| O_DIVERTED, /* arg1=bitmap (1:loop, 2:out) */ |
| O_TCPDATALEN, /* arg1 = tcp data len */ |
| O_IP6_SRC, /* address without mask */ |
| O_IP6_SRC_ME, /* my addresses */ |
| O_IP6_SRC_MASK, /* address with the mask */ |
| O_IP6_DST, |
| O_IP6_DST_ME, |
| O_IP6_DST_MASK, |
| O_FLOW6ID, /* for flow id tag in the ipv6 pkt */ |
| O_ICMP6TYPE, /* icmp6 packet type filtering */ |
| O_EXT_HDR, /* filtering for ipv6 extension header */ |
| O_IP6, |
| |
| /* |
| * actions for ng_ipfw |
| */ |
| O_NETGRAPH, /* send to ng_ipfw */ |
| O_NGTEE, /* copy to ng_ipfw */ |
| |
| O_IP4, |
| |
| O_UNREACH6, /* arg1=icmpv6 code arg (deny) */ |
| |
| O_TAG, /* arg1=tag number */ |
| O_TAGGED, /* arg1=tag number */ |
| |
| O_SETFIB, /* arg1=FIB number */ |
| O_FIB, /* arg1=FIB desired fib number */ |
| |
| O_LAST_OPCODE /* not an opcode! */ |
| }; |
| |
| /* |
| * The extension header are filtered only for presence using a bit |
| * vector with a flag for each header. |
| */ |
| #define EXT_FRAGMENT 0x1 |
| #define EXT_HOPOPTS 0x2 |
| #define EXT_ROUTING 0x4 |
| #define EXT_AH 0x8 |
| #define EXT_ESP 0x10 |
| #define EXT_DSTOPTS 0x20 |
| #define EXT_RTHDR0 0x40 |
| #define EXT_RTHDR2 0x80 |
| |
| /* |
| * Template for instructions. |
| * |
| * ipfw_insn is used for all instructions which require no operands, |
| * a single 16-bit value (arg1), or a couple of 8-bit values. |
| * |
| * For other instructions which require different/larger arguments |
| * we have derived structures, ipfw_insn_*. |
| * |
| * The size of the instruction (in 32-bit words) is in the low |
| * 6 bits of "len". The 2 remaining bits are used to implement |
| * NOT and OR on individual instructions. Given a type, you can |
| * compute the length to be put in "len" using F_INSN_SIZE(t) |
| * |
| * F_NOT negates the match result of the instruction. |
| * |
| * F_OR is used to build or blocks. By default, instructions |
| * are evaluated as part of a logical AND. An "or" block |
| * { X or Y or Z } contains F_OR set in all but the last |
| * instruction of the block. A match will cause the code |
| * to skip past the last instruction of the block. |
| * |
| * NOTA BENE: in a couple of places we assume that |
| * sizeof(ipfw_insn) == sizeof(u_int32_t) |
| * this needs to be fixed. |
| * |
| */ |
| typedef struct _ipfw_insn { /* template for instructions */ |
| u_int8_t opcode; |
| u_int8_t len; /* number of 32-bit words */ |
| #define F_NOT 0x80 |
| #define F_OR 0x40 |
| #define F_LEN_MASK 0x3f |
| #define F_LEN(cmd) ((cmd)->len & F_LEN_MASK) |
| |
| u_int16_t arg1; |
| } ipfw_insn; |
| |
| /* |
| * The F_INSN_SIZE(type) computes the size, in 4-byte words, of |
| * a given type. |
| */ |
| #define F_INSN_SIZE(t) ((sizeof (t))/sizeof(u_int32_t)) |
| |
| /* |
| * This is used to store an array of 16-bit entries (ports etc.) |
| */ |
| typedef struct _ipfw_insn_u16 { |
| ipfw_insn o; |
| u_int16_t ports[2]; /* there may be more */ |
| } ipfw_insn_u16; |
| |
| /* |
| * This is used to store an array of 32-bit entries |
| * (uid, single IPv4 addresses etc.) |
| */ |
| typedef struct _ipfw_insn_u32 { |
| ipfw_insn o; |
| u_int32_t d[1]; /* one or more */ |
| } ipfw_insn_u32; |
| |
| /* |
| * This is used to store IP addr-mask pairs. |
| */ |
| typedef struct _ipfw_insn_ip { |
| ipfw_insn o; |
| struct in_addr addr; |
| struct in_addr mask; |
| } ipfw_insn_ip; |
| |
| /* |
| * This is used to forward to a given address (ip). |
| */ |
| typedef struct _ipfw_insn_sa { |
| ipfw_insn o; |
| struct sockaddr_in sa; |
| } ipfw_insn_sa; |
| |
| /* |
| * This is used for MAC addr-mask pairs. |
| */ |
| typedef struct _ipfw_insn_mac { |
| ipfw_insn o; |
| u_char addr[12]; /* dst[6] + src[6] */ |
| u_char mask[12]; /* dst[6] + src[6] */ |
| } ipfw_insn_mac; |
| |
| /* |
| * This is used for interface match rules (recv xx, xmit xx). |
| */ |
| typedef struct _ipfw_insn_if { |
| ipfw_insn o; |
| union { |
| struct in_addr ip; |
| int glob; |
| } p; |
| char name[IFNAMSIZ]; |
| } ipfw_insn_if; |
| |
| /* |
| * This is used for storing an altq queue id number. |
| */ |
| typedef struct _ipfw_insn_altq { |
| ipfw_insn o; |
| u_int32_t qid; |
| } ipfw_insn_altq; |
| |
| /* |
| * This is used for limit rules. |
| */ |
| typedef struct _ipfw_insn_limit { |
| ipfw_insn o; |
| u_int8_t _pad; |
| u_int8_t limit_mask; /* combination of DYN_* below */ |
| #define DYN_SRC_ADDR 0x1 |
| #define DYN_SRC_PORT 0x2 |
| #define DYN_DST_ADDR 0x4 |
| #define DYN_DST_PORT 0x8 |
| |
| u_int16_t conn_limit; |
| } ipfw_insn_limit; |
| |
| /* |
| * This is used for log instructions. |
| */ |
| typedef struct _ipfw_insn_log { |
| ipfw_insn o; |
| u_int32_t max_log; /* how many do we log -- 0 = all */ |
| u_int32_t log_left; /* how many left to log */ |
| } ipfw_insn_log; |
| |
| /* |
| * Data structures required by both ipfw(8) and ipfw(4) but not part of the |
| * management API are protected by IPFW_INTERNAL. |
| */ |
| #ifdef IPFW_INTERNAL |
| /* Server pool support (LSNAT). */ |
| struct cfg_spool { |
| LIST_ENTRY(cfg_spool) _next; /* chain of spool instances */ |
| struct in_addr addr; |
| u_short port; |
| }; |
| #endif |
| |
| /* Redirect modes id. */ |
| #define REDIR_ADDR 0x01 |
| #define REDIR_PORT 0x02 |
| #define REDIR_PROTO 0x04 |
| |
| #ifdef IPFW_INTERNAL |
| /* Nat redirect configuration. */ |
| struct cfg_redir { |
| LIST_ENTRY(cfg_redir) _next; /* chain of redir instances */ |
| u_int16_t mode; /* type of redirect mode */ |
| struct in_addr laddr; /* local ip address */ |
| struct in_addr paddr; /* public ip address */ |
| struct in_addr raddr; /* remote ip address */ |
| u_short lport; /* local port */ |
| u_short pport; /* public port */ |
| u_short rport; /* remote port */ |
| u_short pport_cnt; /* number of public ports */ |
| u_short rport_cnt; /* number of remote ports */ |
| int proto; /* protocol: tcp/udp */ |
| struct alias_link **alink; |
| /* num of entry in spool chain */ |
| u_int16_t spool_cnt; |
| /* chain of spool instances */ |
| LIST_HEAD(spool_chain, cfg_spool) spool_chain; |
| }; |
| #endif |
| |
| #define NAT_BUF_LEN 1024 |
| |
| #ifdef IPFW_INTERNAL |
| /* Nat configuration data struct. */ |
| struct cfg_nat { |
| /* chain of nat instances */ |
| LIST_ENTRY(cfg_nat) _next; |
| int id; /* nat id */ |
| struct in_addr ip; /* nat ip address */ |
| char if_name[IF_NAMESIZE]; /* interface name */ |
| int mode; /* aliasing mode */ |
| struct libalias *lib; /* libalias instance */ |
| /* number of entry in spool chain */ |
| int redir_cnt; |
| /* chain of redir instances */ |
| LIST_HEAD(redir_chain, cfg_redir) redir_chain; |
| }; |
| #endif |
| |
| #define SOF_NAT sizeof(struct cfg_nat) |
| #define SOF_REDIR sizeof(struct cfg_redir) |
| #define SOF_SPOOL sizeof(struct cfg_spool) |
| |
| /* Nat command. */ |
| typedef struct _ipfw_insn_nat { |
| ipfw_insn o; |
| struct cfg_nat *nat; |
| } ipfw_insn_nat; |
| |
| /* Apply ipv6 mask on ipv6 addr */ |
| #define APPLY_MASK(addr,mask) \ |
| (addr)->__u6_addr.__u6_addr32[0] &= (mask)->__u6_addr.__u6_addr32[0]; \ |
| (addr)->__u6_addr.__u6_addr32[1] &= (mask)->__u6_addr.__u6_addr32[1]; \ |
| (addr)->__u6_addr.__u6_addr32[2] &= (mask)->__u6_addr.__u6_addr32[2]; \ |
| (addr)->__u6_addr.__u6_addr32[3] &= (mask)->__u6_addr.__u6_addr32[3]; |
| |
| /* Structure for ipv6 */ |
| typedef struct _ipfw_insn_ip6 { |
| ipfw_insn o; |
| struct in6_addr addr6; |
| struct in6_addr mask6; |
| } ipfw_insn_ip6; |
| |
| /* Used to support icmp6 types */ |
| typedef struct _ipfw_insn_icmp6 { |
| ipfw_insn o; |
| uint32_t d[7]; /* XXX This number si related to the netinet/icmp6.h |
| * define ICMP6_MAXTYPE |
| * as follows: n = ICMP6_MAXTYPE/32 + 1 |
| * Actually is 203 |
| */ |
| } ipfw_insn_icmp6; |
| |
| /* |
| * Here we have the structure representing an ipfw rule. |
| * |
| * It starts with a general area (with link fields and counters) |
| * followed by an array of one or more instructions, which the code |
| * accesses as an array of 32-bit values. |
| * |
| * Given a rule pointer r: |
| * |
| * r->cmd is the start of the first instruction. |
| * ACTION_PTR(r) is the start of the first action (things to do |
| * once a rule matched). |
| * |
| * When assembling instruction, remember the following: |
| * |
| * + if a rule has a "keep-state" (or "limit") option, then the |
| * first instruction (at r->cmd) MUST BE an O_PROBE_STATE |
| * + if a rule has a "log" option, then the first action |
| * (at ACTION_PTR(r)) MUST be O_LOG |
| * + if a rule has an "altq" option, it comes after "log" |
| * + if a rule has an O_TAG option, it comes after "log" and "altq" |
| * |
| * NOTE: we use a simple linked list of rules because we never need |
| * to delete a rule without scanning the list. We do not use |
| * queue(3) macros for portability and readability. |
| */ |
| |
| struct ip_fw { |
| struct ip_fw *next; /* linked list of rules */ |
| struct ip_fw *next_rule; /* ptr to next [skipto] rule */ |
| /* 'next_rule' is used to pass up 'set_disable' status */ |
| |
| uint16_t act_ofs; /* offset of action in 32-bit units */ |
| uint16_t cmd_len; /* # of 32-bit words in cmd */ |
| uint16_t rulenum; /* rule number */ |
| uint8_t set; /* rule set (0..31) */ |
| #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) |
| |
| /* |
| * This structure is used as a flow mask and a flow id for various |
| * parts of the code. |
| */ |
| struct ipfw_flow_id { |
| u_int32_t dst_ip; |
| u_int32_t src_ip; |
| u_int16_t dst_port; |
| u_int16_t src_port; |
| u_int8_t fib; |
| u_int8_t proto; |
| u_int8_t flags; /* protocol-specific flags */ |
| uint8_t addr_type; /* 4 = ipv4, 6 = ipv6, 1=ether ? */ |
| struct in6_addr dst_ip6; /* could also store MAC addr! */ |
| struct in6_addr src_ip6; |
| u_int32_t flow_id6; |
| u_int32_t frag_id6; |
| }; |
| |
| #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; |
| |
| /* |
| * Main firewall chains definitions and global var's definitions. |
| */ |
| #ifdef _FREEBSD_KERNEL |
| |
| #define MTAG_IPFW 1148380143 /* IPFW-tagged cookie */ |
| |
| /* Return values from ipfw_chk() */ |
| enum { |
| IP_FW_PASS = 0, |
| IP_FW_DENY, |
| IP_FW_DIVERT, |
| IP_FW_TEE, |
| IP_FW_DUMMYNET, |
| IP_FW_NETGRAPH, |
| IP_FW_NGTEE, |
| IP_FW_NAT, |
| IP_FW_REASS, |
| }; |
| |
| /* flags for divert mtag */ |
| #define IP_FW_DIVERT_LOOPBACK_FLAG 0x00080000 |
| #define IP_FW_DIVERT_OUTPUT_FLAG 0x00100000 |
| |
| /* |
| * Structure for collecting parameters to dummynet for ip6_output forwarding |
| */ |
| struct _ip6dn_args { |
| struct ip6_pktopts *opt_or; |
| struct route_in6 ro_or; |
| int flags_or; |
| struct ip6_moptions *im6o_or; |
| struct ifnet *origifp_or; |
| struct ifnet *ifp_or; |
| struct sockaddr_in6 dst_or; |
| u_long mtu_or; |
| struct route_in6 ro_pmtu_or; |
| }; |
| |
| /* |
| * Arguments for calling ipfw_chk() and dummynet_io(). We put them |
| * all into a structure because this way it is easier and more |
| * efficient to pass variables around and extend the interface. |
| */ |
| struct ip_fw_args { |
| struct mbuf *m; /* the mbuf chain */ |
| struct ifnet *oif; /* output interface */ |
| struct sockaddr_in *next_hop; /* forward address */ |
| struct ip_fw *rule; /* matching rule */ |
| uint32_t rule_id; /* matching rule id */ |
| uint32_t chain_id; /* ruleset id */ |
| struct ether_header *eh; /* for bridged packets */ |
| |
| struct ipfw_flow_id f_id; /* grabbed from IP header */ |
| uint32_t cookie; /* a cookie depending on rule action */ |
| struct inpcb *inp; |
| |
| struct _ip6dn_args dummypar; /* dummynet->ip6_output */ |
| struct sockaddr_in hopstore; /* store here if cannot use a pointer */ |
| }; |
| |
| /* |
| * Function definitions. |
| */ |
| |
| /* Firewall hooks */ |
| struct sockopt; |
| struct dn_flow_set; |
| |
| int ipfw_check_in(void *, struct mbuf **, struct ifnet *, int, struct inpcb *inp); |
| int ipfw_check_out(void *, struct mbuf **, struct ifnet *, int, struct inpcb *inp); |
| |
| int ipfw_chk(struct ip_fw_args *); |
| |
| int ipfw_hook(void); |
| int ipfw6_hook(void); |
| int ipfw_unhook(void); |
| int ipfw6_unhook(void); |
| #ifdef NOTYET |
| void ipfw_nat_destroy(void); |
| #endif |
| |
| VNET_DECLARE(int, fw_one_pass); |
| VNET_DECLARE(int, fw_enable); |
| #define V_fw_one_pass VNET(fw_one_pass) |
| #define V_fw_enable VNET(fw_enable) |
| |
| #ifdef INET6 |
| VNET_DECLARE(int, fw6_enable); |
| #define V_fw6_enable VNET(fw6_enable) |
| #endif |
| |
| struct ip_fw_chain { |
| struct ip_fw *rules; /* list of rules */ |
| struct ip_fw *reap; /* list of rules to reap */ |
| LIST_HEAD(, cfg_nat) nat; /* list of nat entries */ |
| struct radix_node_head *tables[IPFW_TABLES_MAX]; |
| struct rwlock rwmtx; |
| uint32_t id; /* ruleset id */ |
| }; |
| |
| #ifdef IPFW_INTERNAL |
| |
| #define IPFW_LOCK_INIT(_chain) \ |
| rw_init(&(_chain)->rwmtx, "IPFW static rules") |
| #define IPFW_LOCK_DESTROY(_chain) rw_destroy(&(_chain)->rwmtx) |
| #define IPFW_WLOCK_ASSERT(_chain) rw_assert(&(_chain)->rwmtx, RA_WLOCKED) |
| |
| #define IPFW_RLOCK(p) rw_rlock(&(p)->rwmtx) |
| #define IPFW_RUNLOCK(p) rw_runlock(&(p)->rwmtx) |
| #define IPFW_WLOCK(p) rw_wlock(&(p)->rwmtx) |
| #define IPFW_WUNLOCK(p) rw_wunlock(&(p)->rwmtx) |
| |
| #define LOOKUP_NAT(l, i, p) do { \ |
| LIST_FOREACH((p), &(l.nat), _next) { \ |
| if ((p)->id == (i)) { \ |
| break; \ |
| } \ |
| } \ |
| } while (0) |
| |
| typedef int ipfw_nat_t(struct ip_fw_args *, struct cfg_nat *, struct mbuf *); |
| typedef int ipfw_nat_cfg_t(struct sockopt *); |
| #endif |
| |
| VNET_DECLARE(struct ip_fw_chain, layer3_chain); |
| #define V_layer3_chain VNET(layer3_chain) |
| |
| #endif /* _FREEBSD_KERNEL */ |
| #endif /* _IPFW2_H */ |