| /* |
| * This code is heavily based on the code in ip_fw.h; see that file for |
| * copyrights and attributions. This code is basically GPL. |
| * |
| * 15-Feb-1997: Major changes to allow graphs for firewall rules. |
| * Paul Russell <Paul.Russell@rustcorp.com.au> and |
| * Michael Neuling <Michael.Neuling@rustcorp.com.au> |
| * 2-Nov-1997: Changed types to __u16, etc. |
| * Removed IP_FW_F_TCPACK & IP_FW_F_BIDIR. |
| * Added inverse flags field. |
| * Removed multiple port specs. |
| */ |
| |
| /* |
| * Format of an IP firewall descriptor |
| * |
| * src, dst, src_mask, dst_mask are always stored in network byte order. |
| * flags are stored in host byte order (of course). |
| * Port numbers are stored in HOST byte order. |
| */ |
| |
| #ifndef _IP_FWCHAINS_H |
| #define _IP_FWCHAINS_H |
| |
| #ifdef __KERNEL__ |
| #include <linux/icmp.h> |
| #include <linux/in.h> |
| #include <linux/ip.h> |
| #include <linux/tcp.h> |
| #include <linux/udp.h> |
| #endif /* __KERNEL__ */ |
| #define IP_FW_MAX_LABEL_LENGTH 8 |
| typedef char ip_chainlabel[IP_FW_MAX_LABEL_LENGTH+1]; |
| |
| struct ip_fw |
| { |
| 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 */ |
| __u32 fw_mark; /* ID to stamp on packet */ |
| __u16 fw_proto; /* Protocol, 0 = ANY */ |
| __u16 fw_flg; /* Flags word */ |
| __u16 fw_invflg; /* Inverse flags */ |
| __u16 fw_spts[2]; /* Source port range. */ |
| __u16 fw_dpts[2]; /* Destination port range. */ |
| __u16 fw_redirpt; /* Port to redirect to. */ |
| __u16 fw_outputsize; /* Max amount to output to |
| NETLINK */ |
| char fw_vianame[IFNAMSIZ]; /* name of interface "via" */ |
| __u8 fw_tosand, fw_tosxor; /* Revised packet priority */ |
| }; |
| |
| struct ip_fwuser |
| { |
| struct ip_fw ipfw; |
| ip_chainlabel label; |
| }; |
| |
| /* Values for "fw_flg" field . */ |
| #define IP_FW_F_PRN 0x0001 /* Print packet if it matches */ |
| #define IP_FW_F_TCPSYN 0x0002 /* For tcp packets-check SYN only */ |
| #define IP_FW_F_FRAG 0x0004 /* Set if rule is a fragment rule */ |
| #define IP_FW_F_MARKABS 0x0008 /* Set the mark to fw_mark, not add. */ |
| #define IP_FW_F_WILDIF 0x0010 /* Need only match start of interface name. */ |
| #define IP_FW_F_NETLINK 0x0020 /* Redirect to netlink: 2.1.x only */ |
| #define IP_FW_F_MASK 0x003F /* All possible flag bits mask */ |
| |
| /* Values for "fw_invflg" field. */ |
| #define IP_FW_INV_SRCIP 0x0001 /* Invert the sense of fw_src. */ |
| #define IP_FW_INV_DSTIP 0x0002 /* Invert the sense of fw_dst. */ |
| #define IP_FW_INV_PROTO 0x0004 /* Invert the sense of fw_proto. */ |
| #define IP_FW_INV_SRCPT 0x0008 /* Invert the sense of source ports. */ |
| #define IP_FW_INV_DSTPT 0x0010 /* Invert the sense of destination ports. */ |
| #define IP_FW_INV_VIA 0x0020 /* Invert the sense of fw_vianame. */ |
| #define IP_FW_INV_SYN 0x0040 /* Invert the sense of IP_FW_F_TCPSYN. */ |
| #define IP_FW_INV_FRAG 0x0080 /* Invert the sense of IP_FW_F_FRAG. */ |
| |
| /* |
| * New IP firewall options for [gs]etsockopt at the RAW IP level. |
| * Unlike BSD Linux inherits IP options so you don't have to use |
| * a raw socket for this. Instead we check rights in the calls. */ |
| |
| #define IP_FW_BASE_CTL 64 /* base for firewall socket options */ |
| |
| #define IP_FW_APPEND (IP_FW_BASE_CTL) /* Takes ip_fwchange */ |
| #define IP_FW_REPLACE (IP_FW_BASE_CTL+1) /* Takes ip_fwnew */ |
| #define IP_FW_DELETE_NUM (IP_FW_BASE_CTL+2) /* Takes ip_fwdelnum */ |
| #define IP_FW_DELETE (IP_FW_BASE_CTL+3) /* Takes ip_fwchange */ |
| #define IP_FW_INSERT (IP_FW_BASE_CTL+4) /* Takes ip_fwnew */ |
| #define IP_FW_FLUSH (IP_FW_BASE_CTL+5) /* Takes ip_chainlabel */ |
| #define IP_FW_ZERO (IP_FW_BASE_CTL+6) /* Takes ip_chainlabel */ |
| #define IP_FW_CHECK (IP_FW_BASE_CTL+7) /* Takes ip_fwtest */ |
| #define IP_FW_MASQ_TIMEOUTS (IP_FW_BASE_CTL+8) /* Takes 3 ints */ |
| #define IP_FW_CREATECHAIN (IP_FW_BASE_CTL+9) /* Takes ip_chainlabel */ |
| #define IP_FW_DELETECHAIN (IP_FW_BASE_CTL+10) /* Takes ip_chainlabel */ |
| #define IP_FW_POLICY (IP_FW_BASE_CTL+11) /* Takes ip_fwpolicy */ |
| /* Masquerade control, only 1 optname */ |
| |
| #define IP_FW_MASQ_CTL (IP_FW_BASE_CTL+12) /* General ip_masq ctl */ |
| |
| /* Builtin chain labels */ |
| #define IP_FW_LABEL_FORWARD "forward" |
| #define IP_FW_LABEL_INPUT "input" |
| #define IP_FW_LABEL_OUTPUT "output" |
| |
| /* Special targets */ |
| #define IP_FW_LABEL_MASQUERADE "MASQ" |
| #define IP_FW_LABEL_REDIRECT "REDIRECT" |
| #define IP_FW_LABEL_ACCEPT "ACCEPT" |
| #define IP_FW_LABEL_BLOCK "DENY" |
| #define IP_FW_LABEL_REJECT "REJECT" |
| #define IP_FW_LABEL_RETURN "RETURN" |
| #define IP_FW_LABEL_QUEUE "QUEUE" |
| |
| /* Files in /proc/net */ |
| #define IP_FW_PROC_CHAINS "ip_fwchains" |
| #define IP_FW_PROC_CHAIN_NAMES "ip_fwnames" |
| |
| |
| struct ip_fwpkt |
| { |
| struct iphdr fwp_iph; /* IP header */ |
| union { |
| struct tcphdr fwp_tcph; /* TCP header or */ |
| struct udphdr fwp_udph; /* UDP header */ |
| struct icmphdr fwp_icmph; /* ICMP header */ |
| } fwp_protoh; |
| struct in_addr fwp_via; /* interface address */ |
| char fwp_vianame[IFNAMSIZ]; /* interface name */ |
| }; |
| |
| /* The argument to IP_FW_DELETE and IP_FW_APPEND */ |
| struct ip_fwchange |
| { |
| struct ip_fwuser fwc_rule; |
| ip_chainlabel fwc_label; |
| }; |
| |
| /* The argument to IP_FW_CHECK. */ |
| struct ip_fwtest |
| { |
| struct ip_fwpkt fwt_packet; /* Packet to be tested */ |
| ip_chainlabel fwt_label; /* Block to start test in */ |
| }; |
| |
| /* The argument to IP_FW_DELETE_NUM */ |
| struct ip_fwdelnum |
| { |
| __u32 fwd_rulenum; |
| ip_chainlabel fwd_label; |
| }; |
| |
| /* The argument to IP_FW_REPLACE and IP_FW_INSERT */ |
| struct ip_fwnew |
| { |
| __u32 fwn_rulenum; |
| struct ip_fwuser fwn_rule; |
| ip_chainlabel fwn_label; |
| }; |
| |
| /* The argument to IP_FW_POLICY */ |
| struct ip_fwpolicy |
| { |
| ip_chainlabel fwp_policy; |
| ip_chainlabel fwp_label; |
| }; |
| /* |
| * timeouts for ip masquerading |
| */ |
| |
| extern int ip_fw_masq_timeouts(void *, int); |
| |
| |
| /* |
| * Main firewall chains definitions and global var's definitions. |
| */ |
| |
| #ifdef __KERNEL__ |
| |
| #include <linux/config.h> |
| #include <linux/version.h> |
| #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,0) |
| #include <linux/init.h> |
| extern void ip_fw_init(void) __init; |
| #else /* 2.0.x */ |
| extern void ip_fw_init(void); |
| #endif /* 2.1.x */ |
| extern int ip_fw_ctl(int, void *, int); |
| #ifdef CONFIG_IP_MASQUERADE |
| extern int ip_masq_uctl(int, char *, int); |
| #endif |
| #endif /* KERNEL */ |
| |
| #endif /* _IP_FWCHAINS_H */ |