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Diffstat (limited to 'sys/netinet/ip_fw.h')
| -rw-r--r-- | sys/netinet/ip_fw.h | 234 |
1 files changed, 234 insertions, 0 deletions
diff --git a/sys/netinet/ip_fw.h b/sys/netinet/ip_fw.h new file mode 100644 index 0000000..eb4a999 --- /dev/null +++ b/sys/netinet/ip_fw.h @@ -0,0 +1,234 @@ +/* + * Copyright (c) 1993 Daniel Boulet + * Copyright (c) 1994 Ugen J.S.Antsilevich + * + * Redistribution and use in source forms, with and without modification, + * are permitted provided that this entire comment appears intact. + * + * Redistribution in binary form may occur without any restrictions. + * Obviously, it would be nice if you gave credit where credit is due + * but requiring it would be too onerous. + * + * This software is provided ``AS IS'' without any warranties of any kind. + * + * $FreeBSD$ + */ + +#ifndef _IP_FW_H +#define _IP_FW_H + +#include <sys/queue.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 10 /* need room ! was IFNAMSIZ */ + 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) + */ + +struct ip_fw { + u_int64_t 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 */ + u_short fw_number; /* Rule number */ + u_int fw_flg; /* Flags word */ +#define IP_FW_MAX_PORTS 10 /* A reasonable maximum */ + union { + u_short fw_pts[IP_FW_MAX_PORTS]; /* Array of port numbers to match */ +#define IP_FW_ICMPTYPES_MAX 128 +#define IP_FW_ICMPTYPES_DIM (IP_FW_ICMPTYPES_MAX / (sizeof(unsigned) * 8)) + unsigned fw_icmptypes[IP_FW_ICMPTYPES_DIM]; /* ICMP types bitmap */ + } fw_uar; + u_char fw_ipopt,fw_ipnopt; /* IP options set/unset */ + u_char fw_tcpf,fw_tcpnf; /* TCP flags set/unset */ + 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_pipe_nr; /* pipe number (option DUMMYNET) */ + u_short fu_skipto_rule; /* SKIPTO command rule number */ + u_short fu_reject_code; /* REJECT response code */ + struct sockaddr_in fu_fwd_ip; + } fw_un; + u_char fw_prot; /* IP protocol */ + /* + * 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) + */ + u_char fw_nports; + void *pipe_ptr; /* Pipe ptr in case of dummynet pipe */ + void *next_rule_ptr ; /* next rule in case of match */ + uid_t fw_uid; /* uid to match */ + gid_t fw_gid; /* gid to match */ + int fw_logamount; /* amount to log */ + u_int64_t fw_loghighest; /* highest number packet to log */ +}; + +/* + * extended ipfw structure... some fields in the original struct + * can be used to pass parameters up/down, namely pointers + * void *pipe_ptr + * void *next_rule_ptr + * some others can be used to pass parameters down, namely counters etc. + * u_int64_t fw_pcnt,fw_bcnt; + * long timestamp; + */ + +struct ip_fw_ext { /* extended structure */ + struct ip_fw rule; /* must be at offset 0 */ + long dont_match_prob; /* 0x7fffffff means 1.0, always fail */ + u_int param1; /* unused at the moment */ +}; + +#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 +#define fw_pipe_nr fw_un.fu_pipe_nr +#define fw_fwd_ip fw_un.fu_fwd_ip + +struct ip_fw_chain { + LIST_ENTRY(ip_fw_chain) chain; + struct ip_fw *rule; +}; + +/* + * Values for "flags" field . + */ +#define IP_FW_F_COMMAND 0x000000ff /* Mask for type of chain entry: */ +#define IP_FW_F_DENY 0x00000000 /* This is a deny rule */ +#define IP_FW_F_REJECT 0x00000001 /* Deny and send a response packet */ +#define IP_FW_F_ACCEPT 0x00000002 /* This is an accept rule */ +#define IP_FW_F_COUNT 0x00000003 /* This is a count rule */ +#define IP_FW_F_DIVERT 0x00000004 /* This is a divert rule */ +#define IP_FW_F_TEE 0x00000005 /* This is a tee rule */ +#define IP_FW_F_SKIPTO 0x00000006 /* This is a skipto rule */ +#define IP_FW_F_FWD 0x00000007 /* This is a "change forwarding address" rule */ +#define IP_FW_F_PIPE 0x00000008 /* This is a dummynet rule */ + +#define IP_FW_F_IN 0x00000100 /* Check inbound packets */ +#define IP_FW_F_OUT 0x00000200 /* Check outbound packets */ +#define IP_FW_F_IIFACE 0x00000400 /* Apply inbound interface test */ +#define IP_FW_F_OIFACE 0x00000800 /* Apply outbound interface test */ + +#define IP_FW_F_PRN 0x00001000 /* Print if this rule matches */ + +#define IP_FW_F_SRNG 0x00002000 /* The first two src ports are a min * + * and max range (stored in host byte * + * order). */ + +#define IP_FW_F_DRNG 0x00004000 /* The first two dst ports are a min * + * and max range (stored in host byte * + * order). */ + +#define IP_FW_F_FRAG 0x00008000 /* Fragment */ + +#define IP_FW_F_IIFNAME 0x00010000 /* In interface by name/unit (not IP) */ +#define IP_FW_F_OIFNAME 0x00020000 /* Out interface by name/unit (not IP) */ + +#define IP_FW_F_INVSRC 0x00040000 /* Invert sense of src check */ +#define IP_FW_F_INVDST 0x00080000 /* Invert sense of dst check */ + +#define IP_FW_F_ICMPBIT 0x00100000 /* ICMP type bitmap is valid */ + +#define IP_FW_F_UID 0x00200000 /* filter by uid */ + +#define IP_FW_F_GID 0x00400000 /* filter by gid */ + +#define IP_FW_F_RND_MATCH 0x00800000 /* probabilistic rule match */ + +#define IP_FW_F_MASK 0x00FFFFFF /* All possible flag bits mask */ + +/* + * 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) + +/* + * 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. + */ +#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 flags. + */ +#define IP_FW_TCPF_FIN TH_FIN +#define IP_FW_TCPF_SYN TH_SYN +#define IP_FW_TCPF_RST TH_RST +#define IP_FW_TCPF_PSH TH_PUSH +#define IP_FW_TCPF_ACK TH_ACK +#define IP_FW_TCPF_URG TH_URG +#define IP_FW_TCPF_ESTAB 0x40 + +/* + * Main firewall chains definitions and global var's definitions. + */ +#ifdef KERNEL + +#define IP_FW_PORT_DYNT_FLAG 0x10000 +#define IP_FW_PORT_TEE_FLAG 0x20000 + +/* + * Function definitions. + */ +void ip_fw_init __P((void)); + +/* Firewall hooks */ +struct ip; +struct sockopt; +typedef int ip_fw_chk_t __P((struct ip **, int, struct ifnet *, u_int16_t *, + struct mbuf **, struct ip_fw_chain **, struct sockaddr_in **)); +typedef int ip_fw_ctl_t __P((struct sockopt *)); +extern ip_fw_chk_t *ip_fw_chk_ptr; +extern ip_fw_ctl_t *ip_fw_ctl_ptr; + +#endif /* KERNEL */ + +#endif /* _IP_FW_H */ |
