mirror of
https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
synced 2024-10-21 02:49:11 +00:00
22dea562bb
Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
486 lines
13 KiB
C
486 lines
13 KiB
C
/*
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* 25-Jul-1998 Major changes to allow for ip chain table
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*
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* 3-Jan-2000 Named tables to allow packet selection for different uses.
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*/
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/*
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* Format of an IP6 firewall descriptor
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*
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* src, dst, src_mask, dst_mask are always stored in network byte order.
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* flags are stored in host byte order (of course).
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* Port numbers are stored in HOST byte order.
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*/
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#ifndef _IP6_TABLES_H
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#define _IP6_TABLES_H
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#ifdef __KERNEL__
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#include <linux/if.h>
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#include <linux/types.h>
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#include <linux/in6.h>
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#include <linux/ipv6.h>
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#include <linux/skbuff.h>
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#endif
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#include <linux/compiler.h>
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#include <linux/netfilter_ipv6.h>
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#define IP6T_FUNCTION_MAXNAMELEN 30
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#define IP6T_TABLE_MAXNAMELEN 32
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/* Yes, Virginia, you have to zero the padding. */
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struct ip6t_ip6 {
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/* Source and destination IP6 addr */
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struct in6_addr src, dst;
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/* Mask for src and dest IP6 addr */
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struct in6_addr smsk, dmsk;
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char iniface[IFNAMSIZ], outiface[IFNAMSIZ];
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unsigned char iniface_mask[IFNAMSIZ], outiface_mask[IFNAMSIZ];
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/* ARGH, HopByHop uses 0, so can't do 0 = ANY,
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instead IP6T_F_NOPROTO must be set */
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u_int16_t proto;
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/* TOS to match iff flags & IP6T_F_TOS */
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u_int8_t tos;
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/* Flags word */
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u_int8_t flags;
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/* Inverse flags */
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u_int8_t invflags;
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};
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/* FIXME: If alignment in kernel different from userspace? --RR */
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struct ip6t_entry_match
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{
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union {
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struct {
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u_int16_t match_size;
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/* Used by userspace */
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char name[IP6T_FUNCTION_MAXNAMELEN-1];
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u_int8_t revision;
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} user;
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struct {
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u_int16_t match_size;
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/* Used inside the kernel */
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struct ip6t_match *match;
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} kernel;
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/* Total length */
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u_int16_t match_size;
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} u;
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unsigned char data[0];
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};
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struct ip6t_entry_target
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{
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union {
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struct {
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u_int16_t target_size;
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/* Used by userspace */
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char name[IP6T_FUNCTION_MAXNAMELEN-1];
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u_int8_t revision;
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} user;
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struct {
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u_int16_t target_size;
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/* Used inside the kernel */
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struct ip6t_target *target;
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} kernel;
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/* Total length */
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u_int16_t target_size;
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} u;
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unsigned char data[0];
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};
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struct ip6t_standard_target
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{
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struct ip6t_entry_target target;
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int verdict;
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};
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struct ip6t_counters
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{
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u_int64_t pcnt, bcnt; /* Packet and byte counters */
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};
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/* Values for "flag" field in struct ip6t_ip6 (general ip6 structure). */
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#define IP6T_F_PROTO 0x01 /* Set if rule cares about upper
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protocols */
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#define IP6T_F_TOS 0x02 /* Match the TOS. */
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#define IP6T_F_GOTO 0x04 /* Set if jump is a goto */
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#define IP6T_F_MASK 0x07 /* All possible flag bits mask. */
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/* Values for "inv" field in struct ip6t_ip6. */
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#define IP6T_INV_VIA_IN 0x01 /* Invert the sense of IN IFACE. */
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#define IP6T_INV_VIA_OUT 0x02 /* Invert the sense of OUT IFACE */
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#define IP6T_INV_TOS 0x04 /* Invert the sense of TOS. */
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#define IP6T_INV_SRCIP 0x08 /* Invert the sense of SRC IP. */
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#define IP6T_INV_DSTIP 0x10 /* Invert the sense of DST OP. */
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#define IP6T_INV_FRAG 0x20 /* Invert the sense of FRAG. */
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#define IP6T_INV_PROTO 0x40 /* Invert the sense of PROTO. */
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#define IP6T_INV_MASK 0x7F /* All possible flag bits mask. */
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/* This structure defines each of the firewall rules. Consists of 3
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parts which are 1) general IP header stuff 2) match specific
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stuff 3) the target to perform if the rule matches */
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struct ip6t_entry
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{
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struct ip6t_ip6 ipv6;
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/* Mark with fields that we care about. */
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unsigned int nfcache;
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/* Size of ipt_entry + matches */
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u_int16_t target_offset;
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/* Size of ipt_entry + matches + target */
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u_int16_t next_offset;
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/* Back pointer */
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unsigned int comefrom;
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/* Packet and byte counters. */
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struct ip6t_counters counters;
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/* The matches (if any), then the target. */
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unsigned char elems[0];
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};
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/*
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* New IP firewall options for [gs]etsockopt at the RAW IP level.
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* Unlike BSD Linux inherits IP options so you don't have to use
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* a raw socket for this. Instead we check rights in the calls. */
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#define IP6T_BASE_CTL 64 /* base for firewall socket options */
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#define IP6T_SO_SET_REPLACE (IP6T_BASE_CTL)
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#define IP6T_SO_SET_ADD_COUNTERS (IP6T_BASE_CTL + 1)
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#define IP6T_SO_SET_MAX IP6T_SO_SET_ADD_COUNTERS
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#define IP6T_SO_GET_INFO (IP6T_BASE_CTL)
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#define IP6T_SO_GET_ENTRIES (IP6T_BASE_CTL + 1)
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#define IP6T_SO_GET_REVISION_MATCH (IP6T_BASE_CTL + 2)
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#define IP6T_SO_GET_REVISION_TARGET (IP6T_BASE_CTL + 3)
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#define IP6T_SO_GET_MAX IP6T_SO_GET_REVISION_TARGET
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/* CONTINUE verdict for targets */
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#define IP6T_CONTINUE 0xFFFFFFFF
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/* For standard target */
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#define IP6T_RETURN (-NF_REPEAT - 1)
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/* TCP matching stuff */
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struct ip6t_tcp
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{
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u_int16_t spts[2]; /* Source port range. */
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u_int16_t dpts[2]; /* Destination port range. */
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u_int8_t option; /* TCP Option iff non-zero*/
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u_int8_t flg_mask; /* TCP flags mask byte */
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u_int8_t flg_cmp; /* TCP flags compare byte */
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u_int8_t invflags; /* Inverse flags */
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};
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/* Values for "inv" field in struct ipt_tcp. */
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#define IP6T_TCP_INV_SRCPT 0x01 /* Invert the sense of source ports. */
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#define IP6T_TCP_INV_DSTPT 0x02 /* Invert the sense of dest ports. */
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#define IP6T_TCP_INV_FLAGS 0x04 /* Invert the sense of TCP flags. */
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#define IP6T_TCP_INV_OPTION 0x08 /* Invert the sense of option test. */
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#define IP6T_TCP_INV_MASK 0x0F /* All possible flags. */
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/* UDP matching stuff */
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struct ip6t_udp
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{
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u_int16_t spts[2]; /* Source port range. */
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u_int16_t dpts[2]; /* Destination port range. */
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u_int8_t invflags; /* Inverse flags */
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};
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/* Values for "invflags" field in struct ipt_udp. */
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#define IP6T_UDP_INV_SRCPT 0x01 /* Invert the sense of source ports. */
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#define IP6T_UDP_INV_DSTPT 0x02 /* Invert the sense of dest ports. */
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#define IP6T_UDP_INV_MASK 0x03 /* All possible flags. */
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/* ICMP matching stuff */
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struct ip6t_icmp
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{
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u_int8_t type; /* type to match */
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u_int8_t code[2]; /* range of code */
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u_int8_t invflags; /* Inverse flags */
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};
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/* Values for "inv" field for struct ipt_icmp. */
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#define IP6T_ICMP_INV 0x01 /* Invert the sense of type/code test */
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/* The argument to IP6T_SO_GET_INFO */
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struct ip6t_getinfo
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{
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/* Which table: caller fills this in. */
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char name[IP6T_TABLE_MAXNAMELEN];
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/* Kernel fills these in. */
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/* Which hook entry points are valid: bitmask */
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unsigned int valid_hooks;
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/* Hook entry points: one per netfilter hook. */
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unsigned int hook_entry[NF_IP6_NUMHOOKS];
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/* Underflow points. */
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unsigned int underflow[NF_IP6_NUMHOOKS];
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/* Number of entries */
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unsigned int num_entries;
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/* Size of entries. */
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unsigned int size;
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};
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/* The argument to IP6T_SO_SET_REPLACE. */
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struct ip6t_replace
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{
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/* Which table. */
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char name[IP6T_TABLE_MAXNAMELEN];
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/* Which hook entry points are valid: bitmask. You can't
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change this. */
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unsigned int valid_hooks;
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/* Number of entries */
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unsigned int num_entries;
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/* Total size of new entries */
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unsigned int size;
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/* Hook entry points. */
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unsigned int hook_entry[NF_IP6_NUMHOOKS];
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/* Underflow points. */
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unsigned int underflow[NF_IP6_NUMHOOKS];
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/* Information about old entries: */
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/* Number of counters (must be equal to current number of entries). */
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unsigned int num_counters;
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/* The old entries' counters. */
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struct ip6t_counters __user *counters;
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/* The entries (hang off end: not really an array). */
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struct ip6t_entry entries[0];
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};
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/* The argument to IP6T_SO_ADD_COUNTERS. */
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struct ip6t_counters_info
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{
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/* Which table. */
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char name[IP6T_TABLE_MAXNAMELEN];
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unsigned int num_counters;
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/* The counters (actually `number' of these). */
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struct ip6t_counters counters[0];
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};
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/* The argument to IP6T_SO_GET_ENTRIES. */
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struct ip6t_get_entries
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{
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/* Which table: user fills this in. */
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char name[IP6T_TABLE_MAXNAMELEN];
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/* User fills this in: total entry size. */
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unsigned int size;
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/* The entries. */
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struct ip6t_entry entrytable[0];
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};
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/* The argument to IP6T_SO_GET_REVISION_*. Returns highest revision
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* kernel supports, if >= revision. */
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struct ip6t_get_revision
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{
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char name[IP6T_FUNCTION_MAXNAMELEN-1];
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u_int8_t revision;
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};
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/* Standard return verdict, or do jump. */
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#define IP6T_STANDARD_TARGET ""
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/* Error verdict. */
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#define IP6T_ERROR_TARGET "ERROR"
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/* Helper functions */
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static __inline__ struct ip6t_entry_target *
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ip6t_get_target(struct ip6t_entry *e)
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{
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return (void *)e + e->target_offset;
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}
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/* fn returns 0 to continue iteration */
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#define IP6T_MATCH_ITERATE(e, fn, args...) \
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({ \
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unsigned int __i; \
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int __ret = 0; \
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struct ip6t_entry_match *__m; \
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\
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for (__i = sizeof(struct ip6t_entry); \
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__i < (e)->target_offset; \
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__i += __m->u.match_size) { \
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__m = (void *)(e) + __i; \
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\
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__ret = fn(__m , ## args); \
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if (__ret != 0) \
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break; \
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} \
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__ret; \
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})
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/* fn returns 0 to continue iteration */
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#define IP6T_ENTRY_ITERATE(entries, size, fn, args...) \
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({ \
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unsigned int __i; \
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int __ret = 0; \
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struct ip6t_entry *__e; \
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\
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for (__i = 0; __i < (size); __i += __e->next_offset) { \
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__e = (void *)(entries) + __i; \
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\
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__ret = fn(__e , ## args); \
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if (__ret != 0) \
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break; \
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} \
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__ret; \
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})
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/*
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* Main firewall chains definitions and global var's definitions.
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*/
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#ifdef __KERNEL__
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#include <linux/init.h>
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extern void ip6t_init(void) __init;
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struct ip6t_match
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{
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struct list_head list;
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const char name[IP6T_FUNCTION_MAXNAMELEN-1];
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u_int8_t revision;
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/* Return true or false: return FALSE and set *hotdrop = 1 to
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force immediate packet drop. */
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/* Arguments changed since 2.6.9, as this must now handle
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non-linear skb, using skb_header_pointer and
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skb_ip_make_writable. */
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int (*match)(const struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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const void *matchinfo,
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int offset,
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unsigned int protoff,
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int *hotdrop);
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/* Called when user tries to insert an entry of this type. */
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/* Should return true or false. */
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int (*checkentry)(const char *tablename,
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const struct ip6t_ip6 *ip,
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void *matchinfo,
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unsigned int matchinfosize,
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unsigned int hook_mask);
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/* Called when entry of this type deleted. */
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void (*destroy)(void *matchinfo, unsigned int matchinfosize);
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/* Set this to THIS_MODULE if you are a module, otherwise NULL */
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struct module *me;
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};
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/* Registration hooks for targets. */
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struct ip6t_target
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{
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struct list_head list;
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const char name[IP6T_FUNCTION_MAXNAMELEN-1];
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u_int8_t revision;
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/* Returns verdict. Argument order changed since 2.6.9, as this
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must now handle non-linear skbs, using skb_copy_bits and
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skb_ip_make_writable. */
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unsigned int (*target)(struct sk_buff **pskb,
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const struct net_device *in,
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const struct net_device *out,
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unsigned int hooknum,
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const void *targinfo,
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void *userdata);
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/* Called when user tries to insert an entry of this type:
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hook_mask is a bitmask of hooks from which it can be
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called. */
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/* Should return true or false. */
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int (*checkentry)(const char *tablename,
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const struct ip6t_entry *e,
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void *targinfo,
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unsigned int targinfosize,
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unsigned int hook_mask);
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/* Called when entry of this type deleted. */
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void (*destroy)(void *targinfo, unsigned int targinfosize);
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/* Set this to THIS_MODULE if you are a module, otherwise NULL */
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struct module *me;
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};
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extern int ip6t_register_target(struct ip6t_target *target);
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extern void ip6t_unregister_target(struct ip6t_target *target);
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extern int ip6t_register_match(struct ip6t_match *match);
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extern void ip6t_unregister_match(struct ip6t_match *match);
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/* Furniture shopping... */
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struct ip6t_table
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{
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struct list_head list;
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/* A unique name... */
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char name[IP6T_TABLE_MAXNAMELEN];
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/* What hooks you will enter on */
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unsigned int valid_hooks;
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/* Lock for the curtain */
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rwlock_t lock;
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/* Man behind the curtain... */
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struct ip6t_table_info *private;
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/* Set this to THIS_MODULE if you are a module, otherwise NULL */
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struct module *me;
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};
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extern int ip6t_register_table(struct ip6t_table *table,
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const struct ip6t_replace *repl);
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extern void ip6t_unregister_table(struct ip6t_table *table);
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extern unsigned int ip6t_do_table(struct sk_buff **pskb,
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unsigned int hook,
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const struct net_device *in,
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const struct net_device *out,
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struct ip6t_table *table,
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void *userdata);
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/* Check for an extension */
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extern int ip6t_ext_hdr(u8 nexthdr);
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/* find specified header and get offset to it */
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extern int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset,
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int target, unsigned short *fragoff);
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extern int ip6_masked_addrcmp(const struct in6_addr *addr1,
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const struct in6_addr *mask,
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const struct in6_addr *addr2);
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#define IP6T_ALIGN(s) (((s) + (__alignof__(struct ip6t_entry)-1)) & ~(__alignof__(struct ip6t_entry)-1))
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#endif /*__KERNEL__*/
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#endif /* _IP6_TABLES_H */
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