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| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
|---|---|
| 2 | /* |
| 3 | * Format of an ARP firewall descriptor |
| 4 | * |
| 5 | * src, tgt, src_mask, tgt_mask, arpop, arpop_mask are always stored in |
| 6 | * network byte order. |
| 7 | * flags are stored in host byte order (of course). |
| 8 | */ |
| 9 | #ifndef _ARPTABLES_H |
| 10 | #define _ARPTABLES_H |
| 11 | |
| 12 | #include <linux/if.h> |
| 13 | #include <linux/in.h> |
| 14 | #include <linux/if_arp.h> |
| 15 | #include <linux/skbuff.h> |
| 16 | #include <uapi/linux/netfilter_arp/arp_tables.h> |
| 17 | |
| 18 | /* Standard entry. */ |
| 19 | struct arpt_standard { |
| 20 | struct arpt_entry entry; |
| 21 | struct xt_standard_target target; |
| 22 | }; |
| 23 | |
| 24 | struct arpt_error { |
| 25 | struct arpt_entry entry; |
| 26 | struct xt_error_target target; |
| 27 | }; |
| 28 | |
| 29 | #define ARPT_ENTRY_INIT(__size) \ |
| 30 | { \ |
| 31 | .target_offset = sizeof(struct arpt_entry), \ |
| 32 | .next_offset = (__size), \ |
| 33 | } |
| 34 | |
| 35 | #define ARPT_STANDARD_INIT(__verdict) \ |
| 36 | { \ |
| 37 | .entry = ARPT_ENTRY_INIT(sizeof(struct arpt_standard)), \ |
| 38 | .target = XT_TARGET_INIT(XT_STANDARD_TARGET, \ |
| 39 | sizeof(struct xt_standard_target)), \ |
| 40 | .target.verdict = -(__verdict) - 1, \ |
| 41 | } |
| 42 | |
| 43 | #define ARPT_ERROR_INIT \ |
| 44 | { \ |
| 45 | .entry = ARPT_ENTRY_INIT(sizeof(struct arpt_error)), \ |
| 46 | .target = XT_TARGET_INIT(XT_ERROR_TARGET, \ |
| 47 | sizeof(struct xt_error_target)), \ |
| 48 | .target.errorname = "ERROR", \ |
| 49 | } |
| 50 | |
| 51 | extern void *arpt_alloc_initial_table(const struct xt_table *); |
| 52 | int arpt_register_table(struct net *net, const struct xt_table *table, |
| 53 | const struct arpt_replace *repl, |
| 54 | const struct nf_hook_ops *ops); |
| 55 | void arpt_unregister_table(struct net *net, const char *name); |
| 56 | void arpt_unregister_table_pre_exit(struct net *net, const char *name); |
| 57 | extern unsigned int arpt_do_table(void *priv, struct sk_buff *skb, |
| 58 | const struct nf_hook_state *state); |
| 59 | |
| 60 | #ifdef CONFIG_NETFILTER_XTABLES_COMPAT |
| 61 | #include <net/compat.h> |
| 62 | |
| 63 | struct compat_arpt_entry { |
| 64 | struct arpt_arp arp; |
| 65 | __u16 target_offset; |
| 66 | __u16 next_offset; |
| 67 | compat_uint_t comefrom; |
| 68 | struct compat_xt_counters counters; |
| 69 | unsigned char elems[]; |
| 70 | }; |
| 71 | |
| 72 | static inline struct xt_entry_target * |
| 73 | compat_arpt_get_target(struct compat_arpt_entry *e) |
| 74 | { |
| 75 | return (void *)e + e->target_offset; |
| 76 | } |
| 77 | |
| 78 | #endif /* CONFIG_COMPAT */ |
| 79 | #endif /* _ARPTABLES_H */ |
| 80 |
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