diff options
Diffstat (limited to 'sys/netinet/ip_fw.h')
| -rw-r--r-- | sys/netinet/ip_fw.h | 141 |
1 files changed, 96 insertions, 45 deletions
diff --git a/sys/netinet/ip_fw.h b/sys/netinet/ip_fw.h index b3ae6ad..96d7357 100644 --- a/sys/netinet/ip_fw.h +++ b/sys/netinet/ip_fw.h @@ -11,51 +11,84 @@ * * This software is provided ``AS IS'' without any warranties of any kind. * - * $Id$ + * $Id: ip_fw.h,v 1.1 1997/05/09 17:46:45 archie Exp $ */ +#ifndef _IP_FW_H +#define _IP_FW_H + +/* + * This union structure identifies an interface, either explicitly + * by name or implicitly by IP address. The flags IP_FW_F_IIFNAME + * and IP_FW_F_OIFNAME say how to interpret this structure. An + * interface unit number of -1 matches any unit number, while an + * IP address of 0.0.0.0 indicates matches any interface. + * + * The receive and transmit interfaces are only compared against the + * the packet if the corresponding bit (IP_FW_F_IIFACE or IP_FW_F_OIFACE) + * is set. Note some packets lack a receive or transmit interface + * (in which case the missing "interface" never matches). + */ + +union ip_fw_if { + struct in_addr fu_via_ip; /* Specified by IP address */ + struct { /* Specified by interface name */ +#define FW_IFNLEN 6 /* To keep structure on 2^x boundary */ + char name[FW_IFNLEN]; + short unit; /* -1 means match any unit */ + } fu_via_if; +}; + /* * Format of an IP firewall descriptor * * fw_src, fw_dst, fw_smsk, fw_dmsk are always stored in network byte order. * fw_flg and fw_n*p are stored in host byte order (of course). * Port numbers are stored in HOST byte order. + * Warning: setsockopt() will fail if sizeof(struct ip_fw) > MLEN (108) */ -#ifndef _IP_FW_H -#define _IP_FW_H struct ip_fw { u_long fw_pcnt,fw_bcnt; /* Packet and byte counters */ struct in_addr fw_src, fw_dst; /* Source and destination IP addr */ struct in_addr fw_smsk, fw_dmsk; /* Mask for src and dest IP addr */ - union { - struct in_addr fu_via_ip; /* Specified by IP address */ - struct { /* Specified by interface name */ -#define FW_IFNLEN 6 /* To keep structure on 2^x boundary */ - char fu_via_name[FW_IFNLEN]; - short fu_via_unit; - } fu_via_if; - } fu_via_un; -#define fw_via_ip fu_via_un.fu_via_ip -#define fw_via_name fu_via_un.fu_via_if.fu_via_name -#define fw_via_unit fu_via_un.fu_via_if.fu_via_unit - u_short fw_number; + u_short fw_number; /* Rule number */ u_short fw_flg; /* Flags word */ - u_short fw_nsp, fw_ndp; /* N'of src ports and # of dst ports */ - /* in ports array (dst ports follow */ - /* src ports; max of 10 ports in all; */ - /* count of 0 means match all ports) */ -#define IP_FW_MAX_PORTS 10 /* A reasonable maximum */ - u_short fw_pts[IP_FW_MAX_PORTS]; /* Array of port numbers to match */ +#define IP_FW_MAX_PORTS 10 /* A reasonable maximum */ + u_short fw_pts[IP_FW_MAX_PORTS]; /* Array of port numbers to match */ u_char fw_ipopt,fw_ipnopt; /* IP options set/unset */ u_char fw_tcpf,fw_tcpnf; /* TCP flags set/unset */ #define IP_FW_ICMPTYPES_DIM (256 / (sizeof(unsigned) * 8)) unsigned fw_icmptypes[IP_FW_ICMPTYPES_DIM]; /* ICMP types bitmap */ - long timestamp; /* timestamp (tv_sec) of last match */ - u_short fw_divert_port; /* Divert port (options IPDIVERT) */ + long timestamp; /* timestamp (tv_sec) of last match */ + union ip_fw_if fw_in_if, fw_out_if; /* Incoming and outgoing interfaces */ + union { + u_short fu_divert_port; /* Divert/tee port (options IPDIVERT) */ + u_short fu_skipto_rule; /* SKIPTO command rule number */ + u_short fu_reject_code; /* REJECT response code */ + } fw_un; u_char fw_prot; /* IP protocol */ + u_char fw_nports; /* N'of src ports and # of dst ports */ + /* in ports array (dst ports follow */ + /* src ports; max of 10 ports in all; */ + /* count of 0 means match all ports) */ }; +#define IP_FW_GETNSRCP(rule) ((rule)->fw_nports & 0x0f) +#define IP_FW_SETNSRCP(rule, n) do { \ + (rule)->fw_nports &= ~0x0f; \ + (rule)->fw_nports |= (n); \ + } while (0) +#define IP_FW_GETNDSTP(rule) ((rule)->fw_nports >> 4) +#define IP_FW_SETNDSTP(rule, n) do { \ + (rule)->fw_nports &= ~0xf0; \ + (rule)->fw_nports |= (n) << 4;\ + } while (0) + +#define fw_divert_port fw_un.fu_divert_port +#define fw_skipto_rule fw_un.fu_skipto_rule +#define fw_reject_code fw_un.fu_reject_code + struct ip_fw_chain { LIST_ENTRY(ip_fw_chain) chain; struct ip_fw *rule; @@ -64,37 +97,55 @@ struct ip_fw_chain { /* * Values for "flags" field . */ -#define IP_FW_F_INVSRC 0x0001 /* Invert sense of src check */ -#define IP_FW_F_INVDST 0x0002 /* Invert sense of dst check */ -#define IP_FW_F_IN 0x0004 /* Inbound */ -#define IP_FW_F_OUT 0x0008 /* Outbound */ +#define IP_FW_F_IN 0x0001 /* Check inbound packets */ +#define IP_FW_F_OUT 0x0002 /* Check outbound packets */ +#define IP_FW_F_IIFACE 0x0004 /* Apply inbound interface test */ +#define IP_FW_F_OIFACE 0x0008 /* Apply outbound interface test */ + +#define IP_FW_F_COMMAND 0x0070 /* Mask for type of chain entry: */ +#define IP_FW_F_DENY 0x0000 /* This is a deny rule */ +#define IP_FW_F_REJECT 0x0010 /* Deny and send a response packet */ +#define IP_FW_F_ACCEPT 0x0020 /* This is an accept rule */ +#define IP_FW_F_COUNT 0x0030 /* This is a count rule */ +#define IP_FW_F_DIVERT 0x0040 /* This is a divert rule */ +#define IP_FW_F_TEE 0x0050 /* This is a tee rule */ +#define IP_FW_F_SKIPTO 0x0060 /* This is a skipto rule */ + +#define IP_FW_F_PRN 0x0080 /* Print if this rule matches */ -#define IP_FW_F_COMMAND 0x0030 /* Mask for type of chain entry: */ -#define IP_FW_F_ACCEPT 0x0010 /* This is an accept rule */ -#define IP_FW_F_COUNT 0x0020 /* This is a count rule */ -#define IP_FW_F_DIVERT 0x0030 /* This is a divert rule */ -#define IP_FW_F_DENY 0x0000 /* This is a deny rule */ +#define IP_FW_F_SRNG 0x0100 /* The first two src ports are a min * + * and max range (stored in host byte * + * order). */ -#define IP_FW_F_PRN 0x0040 /* Print if this rule matches */ -#define IP_FW_F_ICMPRPL 0x0080 /* Send back icmp unreachable packet */ +#define IP_FW_F_DRNG 0x0200 /* The first two dst ports are a min * + * and max range (stored in host byte * + * order). */ -#define IP_FW_F_SRNG 0x0100 /* The first two src ports are a min * - * and max range (stored in host byte * - * order). */ +#define IP_FW_F_IIFNAME 0x0400 /* In interface by name/unit (not IP) */ +#define IP_FW_F_OIFNAME 0x0800 /* Out interface by name/unit (not IP) */ -#define IP_FW_F_DRNG 0x0200 /* The first two dst ports are a min * - * and max range (stored in host byte * - * order). */ +#define IP_FW_F_INVSRC 0x1000 /* Invert sense of src check */ +#define IP_FW_F_INVDST 0x2000 /* Invert sense of dst check */ -#define IP_FW_F_IFNAME 0x0400 /* Use interface name/unit (not IP) */ +#define IP_FW_F_FRAG 0x4000 /* Fragment */ -#define IP_FW_F_FRAG 0x0800 /* Fragment */ +#define IP_FW_F_ICMPBIT 0x8000 /* ICMP type bitmap is valid */ -#define IP_FW_F_ICMPBIT 0x1000 /* ICMP type bitmap is valid */ +#define IP_FW_F_MASK 0xFFFF /* All possible flag bits mask */ -#define IP_FW_F_IFUWILD 0x2000 /* Match all interface units */ +/* + * For backwards compatibility with rules specifying "via iface" but + * not restricted to only "in" or "out" packets, we define this combination + * of bits to represent this configuration. + */ + +#define IF_FW_F_VIAHACK (IP_FW_F_IN|IP_FW_F_OUT|IP_FW_F_IIFACE|IP_FW_F_OIFACE) -#define IP_FW_F_MASK 0x3FFF /* All possible flag bits mask */ +/* + * Definitions for REJECT response codes. + * Values less than 256 correspond to ICMP unreachable codes. + */ +#define IP_FW_REJECT_RST 0x0100 /* TCP packets: send RST */ /* * Definitions for IP option names. |
