Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 423 | giacomo | 1 | /* |
| 2 | * This code is heavily based on the code in ip_fw.h; see that file for |
||
| 3 | * copyrights and attributions. This code is basically GPL. |
||
| 4 | * |
||
| 5 | * 15-Feb-1997: Major changes to allow graphs for firewall rules. |
||
| 6 | * Paul Russell <Paul.Russell@rustcorp.com.au> and |
||
| 7 | * Michael Neuling <Michael.Neuling@rustcorp.com.au> |
||
| 8 | * 2-Nov-1997: Changed types to __u16, etc. |
||
| 9 | * Removed IP_FW_F_TCPACK & IP_FW_F_BIDIR. |
||
| 10 | * Added inverse flags field. |
||
| 11 | * Removed multiple port specs. |
||
| 12 | */ |
||
| 13 | |||
| 14 | /* |
||
| 15 | * Format of an IP firewall descriptor |
||
| 16 | * |
||
| 17 | * src, dst, src_mask, dst_mask are always stored in network byte order. |
||
| 18 | * flags are stored in host byte order (of course). |
||
| 19 | * Port numbers are stored in HOST byte order. |
||
| 20 | */ |
||
| 21 | |||
| 22 | #ifndef _IP_FWCHAINS_H |
||
| 23 | #define _IP_FWCHAINS_H |
||
| 24 | |||
| 25 | #ifdef __KERNEL__ |
||
| 26 | #include <linux/icmp.h> |
||
| 27 | #include <linux/in.h> |
||
| 28 | #include <linux/ip.h> |
||
| 29 | #include <linux/tcp.h> |
||
| 30 | #include <linux/udp.h> |
||
| 31 | #endif /* __KERNEL__ */ |
||
| 32 | #define IP_FW_MAX_LABEL_LENGTH 8 |
||
| 33 | typedef char ip_chainlabel[IP_FW_MAX_LABEL_LENGTH+1]; |
||
| 34 | |||
| 35 | struct ip_fw |
||
| 36 | { |
||
| 37 | struct in_addr fw_src, fw_dst; /* Source and destination IP addr */ |
||
| 38 | struct in_addr fw_smsk, fw_dmsk; /* Mask for src and dest IP addr */ |
||
| 39 | __u32 fw_mark; /* ID to stamp on packet */ |
||
| 40 | __u16 fw_proto; /* Protocol, 0 = ANY */ |
||
| 41 | __u16 fw_flg; /* Flags word */ |
||
| 42 | __u16 fw_invflg; /* Inverse flags */ |
||
| 43 | __u16 fw_spts[2]; /* Source port range. */ |
||
| 44 | __u16 fw_dpts[2]; /* Destination port range. */ |
||
| 45 | __u16 fw_redirpt; /* Port to redirect to. */ |
||
| 46 | __u16 fw_outputsize; /* Max amount to output to |
||
| 47 | NETLINK */ |
||
| 48 | char fw_vianame[IFNAMSIZ]; /* name of interface "via" */ |
||
| 49 | __u8 fw_tosand, fw_tosxor; /* Revised packet priority */ |
||
| 50 | }; |
||
| 51 | |||
| 52 | struct ip_fwuser |
||
| 53 | { |
||
| 54 | struct ip_fw ipfw; |
||
| 55 | ip_chainlabel label; |
||
| 56 | }; |
||
| 57 | |||
| 58 | /* Values for "fw_flg" field . */ |
||
| 59 | #define IP_FW_F_PRN 0x0001 /* Print packet if it matches */ |
||
| 60 | #define IP_FW_F_TCPSYN 0x0002 /* For tcp packets-check SYN only */ |
||
| 61 | #define IP_FW_F_FRAG 0x0004 /* Set if rule is a fragment rule */ |
||
| 62 | #define IP_FW_F_MARKABS 0x0008 /* Set the mark to fw_mark, not add. */ |
||
| 63 | #define IP_FW_F_WILDIF 0x0010 /* Need only match start of interface name. */ |
||
| 64 | #define IP_FW_F_NETLINK 0x0020 /* Redirect to netlink: 2.1.x only */ |
||
| 65 | #define IP_FW_F_MASK 0x003F /* All possible flag bits mask */ |
||
| 66 | |||
| 67 | /* Values for "fw_invflg" field. */ |
||
| 68 | #define IP_FW_INV_SRCIP 0x0001 /* Invert the sense of fw_src. */ |
||
| 69 | #define IP_FW_INV_DSTIP 0x0002 /* Invert the sense of fw_dst. */ |
||
| 70 | #define IP_FW_INV_PROTO 0x0004 /* Invert the sense of fw_proto. */ |
||
| 71 | #define IP_FW_INV_SRCPT 0x0008 /* Invert the sense of source ports. */ |
||
| 72 | #define IP_FW_INV_DSTPT 0x0010 /* Invert the sense of destination ports. */ |
||
| 73 | #define IP_FW_INV_VIA 0x0020 /* Invert the sense of fw_vianame. */ |
||
| 74 | #define IP_FW_INV_SYN 0x0040 /* Invert the sense of IP_FW_F_TCPSYN. */ |
||
| 75 | #define IP_FW_INV_FRAG 0x0080 /* Invert the sense of IP_FW_F_FRAG. */ |
||
| 76 | |||
| 77 | /* |
||
| 78 | * New IP firewall options for [gs]etsockopt at the RAW IP level. |
||
| 79 | * Unlike BSD Linux inherits IP options so you don't have to use |
||
| 80 | * a raw socket for this. Instead we check rights in the calls. */ |
||
| 81 | |||
| 82 | #define IP_FW_BASE_CTL 64 /* base for firewall socket options */ |
||
| 83 | |||
| 84 | #define IP_FW_APPEND (IP_FW_BASE_CTL) /* Takes ip_fwchange */ |
||
| 85 | #define IP_FW_REPLACE (IP_FW_BASE_CTL+1) /* Takes ip_fwnew */ |
||
| 86 | #define IP_FW_DELETE_NUM (IP_FW_BASE_CTL+2) /* Takes ip_fwdelnum */ |
||
| 87 | #define IP_FW_DELETE (IP_FW_BASE_CTL+3) /* Takes ip_fwchange */ |
||
| 88 | #define IP_FW_INSERT (IP_FW_BASE_CTL+4) /* Takes ip_fwnew */ |
||
| 89 | #define IP_FW_FLUSH (IP_FW_BASE_CTL+5) /* Takes ip_chainlabel */ |
||
| 90 | #define IP_FW_ZERO (IP_FW_BASE_CTL+6) /* Takes ip_chainlabel */ |
||
| 91 | #define IP_FW_CHECK (IP_FW_BASE_CTL+7) /* Takes ip_fwtest */ |
||
| 92 | #define IP_FW_MASQ_TIMEOUTS (IP_FW_BASE_CTL+8) /* Takes 3 ints */ |
||
| 93 | #define IP_FW_CREATECHAIN (IP_FW_BASE_CTL+9) /* Takes ip_chainlabel */ |
||
| 94 | #define IP_FW_DELETECHAIN (IP_FW_BASE_CTL+10) /* Takes ip_chainlabel */ |
||
| 95 | #define IP_FW_POLICY (IP_FW_BASE_CTL+11) /* Takes ip_fwpolicy */ |
||
| 96 | /* Masquerade control, only 1 optname */ |
||
| 97 | |||
| 98 | #define IP_FW_MASQ_CTL (IP_FW_BASE_CTL+12) /* General ip_masq ctl */ |
||
| 99 | |||
| 100 | /* Builtin chain labels */ |
||
| 101 | #define IP_FW_LABEL_FORWARD "forward" |
||
| 102 | #define IP_FW_LABEL_INPUT "input" |
||
| 103 | #define IP_FW_LABEL_OUTPUT "output" |
||
| 104 | |||
| 105 | /* Special targets */ |
||
| 106 | #define IP_FW_LABEL_MASQUERADE "MASQ" |
||
| 107 | #define IP_FW_LABEL_REDIRECT "REDIRECT" |
||
| 108 | #define IP_FW_LABEL_ACCEPT "ACCEPT" |
||
| 109 | #define IP_FW_LABEL_BLOCK "DENY" |
||
| 110 | #define IP_FW_LABEL_REJECT "REJECT" |
||
| 111 | #define IP_FW_LABEL_RETURN "RETURN" |
||
| 112 | #define IP_FW_LABEL_QUEUE "QUEUE" |
||
| 113 | |||
| 114 | /* Files in /proc/net */ |
||
| 115 | #define IP_FW_PROC_CHAINS "ip_fwchains" |
||
| 116 | #define IP_FW_PROC_CHAIN_NAMES "ip_fwnames" |
||
| 117 | |||
| 118 | |||
| 119 | struct ip_fwpkt |
||
| 120 | { |
||
| 121 | struct iphdr fwp_iph; /* IP header */ |
||
| 122 | union { |
||
| 123 | struct tcphdr fwp_tcph; /* TCP header or */ |
||
| 124 | struct udphdr fwp_udph; /* UDP header */ |
||
| 125 | struct icmphdr fwp_icmph; /* ICMP header */ |
||
| 126 | } fwp_protoh; |
||
| 127 | struct in_addr fwp_via; /* interface address */ |
||
| 128 | char fwp_vianame[IFNAMSIZ]; /* interface name */ |
||
| 129 | }; |
||
| 130 | |||
| 131 | /* The argument to IP_FW_DELETE and IP_FW_APPEND */ |
||
| 132 | struct ip_fwchange |
||
| 133 | { |
||
| 134 | struct ip_fwuser fwc_rule; |
||
| 135 | ip_chainlabel fwc_label; |
||
| 136 | }; |
||
| 137 | |||
| 138 | /* The argument to IP_FW_CHECK. */ |
||
| 139 | struct ip_fwtest |
||
| 140 | { |
||
| 141 | struct ip_fwpkt fwt_packet; /* Packet to be tested */ |
||
| 142 | ip_chainlabel fwt_label; /* Block to start test in */ |
||
| 143 | }; |
||
| 144 | |||
| 145 | /* The argument to IP_FW_DELETE_NUM */ |
||
| 146 | struct ip_fwdelnum |
||
| 147 | { |
||
| 148 | __u32 fwd_rulenum; |
||
| 149 | ip_chainlabel fwd_label; |
||
| 150 | }; |
||
| 151 | |||
| 152 | /* The argument to IP_FW_REPLACE and IP_FW_INSERT */ |
||
| 153 | struct ip_fwnew |
||
| 154 | { |
||
| 155 | __u32 fwn_rulenum; |
||
| 156 | struct ip_fwuser fwn_rule; |
||
| 157 | ip_chainlabel fwn_label; |
||
| 158 | }; |
||
| 159 | |||
| 160 | /* The argument to IP_FW_POLICY */ |
||
| 161 | struct ip_fwpolicy |
||
| 162 | { |
||
| 163 | ip_chainlabel fwp_policy; |
||
| 164 | ip_chainlabel fwp_label; |
||
| 165 | }; |
||
| 166 | /* |
||
| 167 | * timeouts for ip masquerading |
||
| 168 | */ |
||
| 169 | |||
| 170 | extern int ip_fw_masq_timeouts(void *, int); |
||
| 171 | |||
| 172 | |||
| 173 | /* |
||
| 174 | * Main firewall chains definitions and global var's definitions. |
||
| 175 | */ |
||
| 176 | |||
| 177 | #ifdef __KERNEL__ |
||
| 178 | |||
| 179 | #include <linux/config.h> |
||
| 180 | #include <linux/version.h> |
||
| 181 | #include <linux/init.h> |
||
| 182 | extern void ip_fw_init(void) __init; |
||
| 183 | extern int ip_fw_ctl(int, void *, int); |
||
| 184 | #ifdef CONFIG_IP_MASQUERADE |
||
| 185 | extern int ip_masq_uctl(int, char *, int); |
||
| 186 | #endif |
||
| 187 | #endif /* KERNEL */ |
||
| 188 | |||
| 189 | #endif /* _IP_FWCHAINS_H */ |