| /* |
| * 25-Jul-1998 Major changes to allow for ip chain table |
| * |
| * 3-Jan-2000 Named tables to allow packet selection for different uses. |
| */ |
| |
| /* |
| * Format of an IP6 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 _IP6_TABLES_H |
| #define _IP6_TABLES_H |
| |
| #ifdef __KERNEL__ |
| #include <linux/if.h> |
| #include <linux/types.h> |
| #include <linux/in6.h> |
| #include <linux/ipv6.h> |
| #include <linux/skbuff.h> |
| #endif |
| #include <linux/compiler.h> |
| #include <linux/netfilter_ipv6.h> |
| |
| #define IP6T_FUNCTION_MAXNAMELEN 30 |
| #define IP6T_TABLE_MAXNAMELEN 32 |
| |
| /* Yes, Virginia, you have to zero the padding. */ |
| struct ip6t_ip6 { |
| /* Source and destination IP6 addr */ |
| struct in6_addr src, dst; |
| /* Mask for src and dest IP6 addr */ |
| struct in6_addr smsk, dmsk; |
| char iniface[IFNAMSIZ], outiface[IFNAMSIZ]; |
| unsigned char iniface_mask[IFNAMSIZ], outiface_mask[IFNAMSIZ]; |
| |
| /* ARGH, HopByHop uses 0, so can't do 0 = ANY, |
| instead IP6T_F_NOPROTO must be set */ |
| u_int16_t proto; |
| /* TOS to match iff flags & IP6T_F_TOS */ |
| u_int8_t tos; |
| |
| /* Flags word */ |
| u_int8_t flags; |
| /* Inverse flags */ |
| u_int8_t invflags; |
| }; |
| |
| /* FIXME: If alignment in kernel different from userspace? --RR */ |
| struct ip6t_entry_match |
| { |
| union { |
| struct { |
| u_int16_t match_size; |
| |
| /* Used by userspace */ |
| char name[IP6T_FUNCTION_MAXNAMELEN]; |
| } user; |
| struct { |
| u_int16_t match_size; |
| |
| /* Used inside the kernel */ |
| struct ip6t_match *match; |
| } kernel; |
| |
| /* Total length */ |
| u_int16_t match_size; |
| } u; |
| |
| unsigned char data[0]; |
| }; |
| |
| struct ip6t_entry_target |
| { |
| union { |
| struct { |
| u_int16_t target_size; |
| |
| /* Used by userspace */ |
| char name[IP6T_FUNCTION_MAXNAMELEN]; |
| } user; |
| struct { |
| u_int16_t target_size; |
| |
| /* Used inside the kernel */ |
| struct ip6t_target *target; |
| } kernel; |
| |
| /* Total length */ |
| u_int16_t target_size; |
| } u; |
| |
| unsigned char data[0]; |
| }; |
| |
| struct ip6t_standard_target |
| { |
| struct ip6t_entry_target target; |
| int verdict; |
| }; |
| |
| struct ip6t_counters |
| { |
| u_int64_t pcnt, bcnt; /* Packet and byte counters */ |
| }; |
| |
| /* Values for "flag" field in struct ip6t_ip6 (general ip6 structure). */ |
| #define IP6T_F_PROTO 0x01 /* Set if rule cares about upper |
| protocols */ |
| #define IP6T_F_TOS 0x02 /* Match the TOS. */ |
| #define IP6T_F_MASK 0x03 /* All possible flag bits mask. */ |
| |
| /* Values for "inv" field in struct ip6t_ip6. */ |
| #define IP6T_INV_VIA_IN 0x01 /* Invert the sense of IN IFACE. */ |
| #define IP6T_INV_VIA_OUT 0x02 /* Invert the sense of OUT IFACE */ |
| #define IP6T_INV_TOS 0x04 /* Invert the sense of TOS. */ |
| #define IP6T_INV_SRCIP 0x08 /* Invert the sense of SRC IP. */ |
| #define IP6T_INV_DSTIP 0x10 /* Invert the sense of DST OP. */ |
| #define IP6T_INV_FRAG 0x20 /* Invert the sense of FRAG. */ |
| #define IP6T_INV_PROTO 0x40 /* Invert the sense of PROTO. */ |
| #define IP6T_INV_MASK 0x7F /* All possible flag bits mask. */ |
| |
| /* This structure defines each of the firewall rules. Consists of 3 |
| parts which are 1) general IP header stuff 2) match specific |
| stuff 3) the target to perform if the rule matches */ |
| struct ip6t_entry |
| { |
| struct ip6t_ip6 ipv6; |
| |
| /* Mark with fields that we care about. */ |
| unsigned int nfcache; |
| |
| /* Size of ipt_entry + matches */ |
| u_int16_t target_offset; |
| /* Size of ipt_entry + matches + target */ |
| u_int16_t next_offset; |
| |
| /* Back pointer */ |
| unsigned int comefrom; |
| |
| /* Packet and byte counters. */ |
| struct ip6t_counters counters; |
| |
| /* The matches (if any), then the target. */ |
| unsigned char elems[0]; |
| }; |
| |
| /* |
| * 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 IP6T_BASE_CTL 64 /* base for firewall socket options */ |
| |
| #define IP6T_SO_SET_REPLACE (IP6T_BASE_CTL) |
| #define IP6T_SO_SET_ADD_COUNTERS (IP6T_BASE_CTL + 1) |
| #define IP6T_SO_SET_MAX IP6T_SO_SET_ADD_COUNTERS |
| |
| #define IP6T_SO_GET_INFO (IP6T_BASE_CTL) |
| #define IP6T_SO_GET_ENTRIES (IP6T_BASE_CTL + 1) |
| #define IP6T_SO_GET_MAX IP6T_SO_GET_ENTRIES |
| |
| /* CONTINUE verdict for targets */ |
| #define IP6T_CONTINUE 0xFFFFFFFF |
| |
| /* For standard target */ |
| #define IP6T_RETURN (-NF_REPEAT - 1) |
| |
| /* TCP matching stuff */ |
| struct ip6t_tcp |
| { |
| u_int16_t spts[2]; /* Source port range. */ |
| u_int16_t dpts[2]; /* Destination port range. */ |
| u_int8_t option; /* TCP Option iff non-zero*/ |
| u_int8_t flg_mask; /* TCP flags mask byte */ |
| u_int8_t flg_cmp; /* TCP flags compare byte */ |
| u_int8_t invflags; /* Inverse flags */ |
| }; |
| |
| /* Values for "inv" field in struct ipt_tcp. */ |
| #define IP6T_TCP_INV_SRCPT 0x01 /* Invert the sense of source ports. */ |
| #define IP6T_TCP_INV_DSTPT 0x02 /* Invert the sense of dest ports. */ |
| #define IP6T_TCP_INV_FLAGS 0x04 /* Invert the sense of TCP flags. */ |
| #define IP6T_TCP_INV_OPTION 0x08 /* Invert the sense of option test. */ |
| #define IP6T_TCP_INV_MASK 0x0F /* All possible flags. */ |
| |
| /* UDP matching stuff */ |
| struct ip6t_udp |
| { |
| u_int16_t spts[2]; /* Source port range. */ |
| u_int16_t dpts[2]; /* Destination port range. */ |
| u_int8_t invflags; /* Inverse flags */ |
| }; |
| |
| /* Values for "invflags" field in struct ipt_udp. */ |
| #define IP6T_UDP_INV_SRCPT 0x01 /* Invert the sense of source ports. */ |
| #define IP6T_UDP_INV_DSTPT 0x02 /* Invert the sense of dest ports. */ |
| #define IP6T_UDP_INV_MASK 0x03 /* All possible flags. */ |
| |
| /* ICMP matching stuff */ |
| struct ip6t_icmp |
| { |
| u_int8_t type; /* type to match */ |
| u_int8_t code[2]; /* range of code */ |
| u_int8_t invflags; /* Inverse flags */ |
| }; |
| |
| /* Values for "inv" field for struct ipt_icmp. */ |
| #define IP6T_ICMP_INV 0x01 /* Invert the sense of type/code test */ |
| |
| /* The argument to IP6T_SO_GET_INFO */ |
| struct ip6t_getinfo |
| { |
| /* Which table: caller fills this in. */ |
| char name[IP6T_TABLE_MAXNAMELEN]; |
| |
| /* Kernel fills these in. */ |
| /* Which hook entry points are valid: bitmask */ |
| unsigned int valid_hooks; |
| |
| /* Hook entry points: one per netfilter hook. */ |
| unsigned int hook_entry[NF_IP6_NUMHOOKS]; |
| |
| /* Underflow points. */ |
| unsigned int underflow[NF_IP6_NUMHOOKS]; |
| |
| /* Number of entries */ |
| unsigned int num_entries; |
| |
| /* Size of entries. */ |
| unsigned int size; |
| }; |
| |
| /* The argument to IP6T_SO_SET_REPLACE. */ |
| struct ip6t_replace |
| { |
| /* Which table. */ |
| char name[IP6T_TABLE_MAXNAMELEN]; |
| |
| /* Which hook entry points are valid: bitmask. You can't |
| change this. */ |
| unsigned int valid_hooks; |
| |
| /* Number of entries */ |
| unsigned int num_entries; |
| |
| /* Total size of new entries */ |
| unsigned int size; |
| |
| /* Hook entry points. */ |
| unsigned int hook_entry[NF_IP6_NUMHOOKS]; |
| |
| /* Underflow points. */ |
| unsigned int underflow[NF_IP6_NUMHOOKS]; |
| |
| /* Information about old entries: */ |
| /* Number of counters (must be equal to current number of entries). */ |
| unsigned int num_counters; |
| /* The old entries' counters. */ |
| struct ip6t_counters __user *counters; |
| |
| /* The entries (hang off end: not really an array). */ |
| struct ip6t_entry entries[0]; |
| }; |
| |
| /* The argument to IP6T_SO_ADD_COUNTERS. */ |
| struct ip6t_counters_info |
| { |
| /* Which table. */ |
| char name[IP6T_TABLE_MAXNAMELEN]; |
| |
| unsigned int num_counters; |
| |
| /* The counters (actually `number' of these). */ |
| struct ip6t_counters counters[0]; |
| }; |
| |
| /* The argument to IP6T_SO_GET_ENTRIES. */ |
| struct ip6t_get_entries |
| { |
| /* Which table: user fills this in. */ |
| char name[IP6T_TABLE_MAXNAMELEN]; |
| |
| /* User fills this in: total entry size. */ |
| unsigned int size; |
| |
| /* The entries. */ |
| struct ip6t_entry entrytable[0]; |
| }; |
| |
| /* Standard return verdict, or do jump. */ |
| #define IP6T_STANDARD_TARGET "" |
| /* Error verdict. */ |
| #define IP6T_ERROR_TARGET "ERROR" |
| |
| /* Helper functions */ |
| static __inline__ struct ip6t_entry_target * |
| ip6t_get_target(struct ip6t_entry *e) |
| { |
| return (void *)e + e->target_offset; |
| } |
| |
| /* fn returns 0 to continue iteration */ |
| #define IP6T_MATCH_ITERATE(e, fn, args...) \ |
| ({ \ |
| unsigned int __i; \ |
| int __ret = 0; \ |
| struct ip6t_entry_match *__m; \ |
| \ |
| for (__i = sizeof(struct ip6t_entry); \ |
| __i < (e)->target_offset; \ |
| __i += __m->u.match_size) { \ |
| __m = (void *)(e) + __i; \ |
| \ |
| __ret = fn(__m , ## args); \ |
| if (__ret != 0) \ |
| break; \ |
| } \ |
| __ret; \ |
| }) |
| |
| /* fn returns 0 to continue iteration */ |
| #define IP6T_ENTRY_ITERATE(entries, size, fn, args...) \ |
| ({ \ |
| unsigned int __i; \ |
| int __ret = 0; \ |
| struct ip6t_entry *__e; \ |
| \ |
| for (__i = 0; __i < (size); __i += __e->next_offset) { \ |
| __e = (void *)(entries) + __i; \ |
| \ |
| __ret = fn(__e , ## args); \ |
| if (__ret != 0) \ |
| break; \ |
| } \ |
| __ret; \ |
| }) |
| |
| /* |
| * Main firewall chains definitions and global var's definitions. |
| */ |
| |
| #ifdef __KERNEL__ |
| |
| #include <linux/init.h> |
| extern void ip6t_init(void) __init; |
| |
| struct ip6t_match |
| { |
| struct list_head list; |
| |
| const char name[IP6T_FUNCTION_MAXNAMELEN]; |
| |
| /* Return true or false: return FALSE and set *hotdrop = 1 to |
| force immediate packet drop. */ |
| /* Arguments changed since 2.6.9, as this must now handle |
| non-linear skb, using skb_header_pointer and |
| skb_ip_make_writable. */ |
| int (*match)(const struct sk_buff *skb, |
| const struct net_device *in, |
| const struct net_device *out, |
| const void *matchinfo, |
| int offset, |
| unsigned int protoff, |
| int *hotdrop); |
| |
| /* Called when user tries to insert an entry of this type. */ |
| /* Should return true or false. */ |
| int (*checkentry)(const char *tablename, |
| const struct ip6t_ip6 *ip, |
| void *matchinfo, |
| unsigned int matchinfosize, |
| unsigned int hook_mask); |
| |
| /* Called when entry of this type deleted. */ |
| void (*destroy)(void *matchinfo, unsigned int matchinfosize); |
| |
| /* Set this to THIS_MODULE if you are a module, otherwise NULL */ |
| struct module *me; |
| }; |
| |
| /* Registration hooks for targets. */ |
| struct ip6t_target |
| { |
| struct list_head list; |
| |
| const char name[IP6T_FUNCTION_MAXNAMELEN]; |
| |
| /* Returns verdict. Argument order changed since 2.6.9, as this |
| must now handle non-linear skbs, using skb_copy_bits and |
| skb_ip_make_writable. */ |
| unsigned int (*target)(struct sk_buff **pskb, |
| const struct net_device *in, |
| const struct net_device *out, |
| unsigned int hooknum, |
| const void *targinfo, |
| void *userdata); |
| |
| /* Called when user tries to insert an entry of this type: |
| hook_mask is a bitmask of hooks from which it can be |
| called. */ |
| /* Should return true or false. */ |
| int (*checkentry)(const char *tablename, |
| const struct ip6t_entry *e, |
| void *targinfo, |
| unsigned int targinfosize, |
| unsigned int hook_mask); |
| |
| /* Called when entry of this type deleted. */ |
| void (*destroy)(void *targinfo, unsigned int targinfosize); |
| |
| /* Set this to THIS_MODULE if you are a module, otherwise NULL */ |
| struct module *me; |
| }; |
| |
| extern int ip6t_register_target(struct ip6t_target *target); |
| extern void ip6t_unregister_target(struct ip6t_target *target); |
| |
| extern int ip6t_register_match(struct ip6t_match *match); |
| extern void ip6t_unregister_match(struct ip6t_match *match); |
| |
| /* Furniture shopping... */ |
| struct ip6t_table |
| { |
| struct list_head list; |
| |
| /* A unique name... */ |
| char name[IP6T_TABLE_MAXNAMELEN]; |
| |
| /* What hooks you will enter on */ |
| unsigned int valid_hooks; |
| |
| /* Lock for the curtain */ |
| rwlock_t lock; |
| |
| /* Man behind the curtain... */ |
| struct ip6t_table_info *private; |
| |
| /* Set this to THIS_MODULE if you are a module, otherwise NULL */ |
| struct module *me; |
| }; |
| |
| extern int ip6t_register_table(struct ip6t_table *table, |
| const struct ip6t_replace *repl); |
| extern void ip6t_unregister_table(struct ip6t_table *table); |
| extern unsigned int ip6t_do_table(struct sk_buff **pskb, |
| unsigned int hook, |
| const struct net_device *in, |
| const struct net_device *out, |
| struct ip6t_table *table, |
| void *userdata); |
| |
| /* Check for an extension */ |
| extern int ip6t_ext_hdr(u8 nexthdr); |
| |
| #define IP6T_ALIGN(s) (((s) + (__alignof__(struct ip6t_entry)-1)) & ~(__alignof__(struct ip6t_entry)-1)) |
| |
| #endif /*__KERNEL__*/ |
| #endif /* _IP6_TABLES_H */ |