| /* |
| * 'raw' table, which is the very first hooked in at PRE_ROUTING and LOCAL_OUT . |
| * |
| * Copyright (C) 2003 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> |
| */ |
| #include <linux/module.h> |
| #include <linux/netfilter_ipv4/ip_tables.h> |
| |
| #define RAW_VALID_HOOKS ((1 << NF_IP_PRE_ROUTING) | (1 << NF_IP_LOCAL_OUT)) |
| |
| static struct |
| { |
| struct ipt_replace repl; |
| struct ipt_standard entries[2]; |
| struct ipt_error term; |
| } initial_table __initdata = { |
| .repl = { |
| .name = "raw", |
| .valid_hooks = RAW_VALID_HOOKS, |
| .num_entries = 3, |
| .size = sizeof(struct ipt_standard) * 2 + sizeof(struct ipt_error), |
| .hook_entry = { |
| [NF_IP_PRE_ROUTING] = 0, |
| [NF_IP_LOCAL_OUT] = sizeof(struct ipt_standard) }, |
| .underflow = { |
| [NF_IP_PRE_ROUTING] = 0, |
| [NF_IP_LOCAL_OUT] = sizeof(struct ipt_standard) }, |
| }, |
| .entries = { |
| /* PRE_ROUTING */ |
| { |
| .entry = { |
| .target_offset = sizeof(struct ipt_entry), |
| .next_offset = sizeof(struct ipt_standard), |
| }, |
| .target = { |
| .target = { |
| .u = { |
| .target_size = IPT_ALIGN(sizeof(struct ipt_standard_target)), |
| }, |
| }, |
| .verdict = -NF_ACCEPT - 1, |
| }, |
| }, |
| |
| /* LOCAL_OUT */ |
| { |
| .entry = { |
| .target_offset = sizeof(struct ipt_entry), |
| .next_offset = sizeof(struct ipt_standard), |
| }, |
| .target = { |
| .target = { |
| .u = { |
| .target_size = IPT_ALIGN(sizeof(struct ipt_standard_target)), |
| }, |
| }, |
| .verdict = -NF_ACCEPT - 1, |
| }, |
| }, |
| }, |
| /* ERROR */ |
| .term = { |
| .entry = { |
| .target_offset = sizeof(struct ipt_entry), |
| .next_offset = sizeof(struct ipt_error), |
| }, |
| .target = { |
| .target = { |
| .u = { |
| .user = { |
| .target_size = IPT_ALIGN(sizeof(struct ipt_error_target)), |
| .name = IPT_ERROR_TARGET, |
| }, |
| }, |
| }, |
| .errorname = "ERROR", |
| }, |
| } |
| }; |
| |
| static struct ipt_table packet_raw = { |
| .name = "raw", |
| .valid_hooks = RAW_VALID_HOOKS, |
| .lock = RW_LOCK_UNLOCKED, |
| .me = THIS_MODULE |
| }; |
| |
| /* The work comes in here from netfilter.c. */ |
| static unsigned int |
| ipt_hook(unsigned int hook, |
| struct sk_buff **pskb, |
| const struct net_device *in, |
| const struct net_device *out, |
| int (*okfn)(struct sk_buff *)) |
| { |
| return ipt_do_table(pskb, hook, in, out, &packet_raw, NULL); |
| } |
| |
| /* 'raw' is the very first table. */ |
| static struct nf_hook_ops ipt_ops[] = { |
| { |
| .hook = ipt_hook, |
| .pf = PF_INET, |
| .hooknum = NF_IP_PRE_ROUTING, |
| .priority = NF_IP_PRI_RAW, |
| .owner = THIS_MODULE, |
| }, |
| { |
| .hook = ipt_hook, |
| .pf = PF_INET, |
| .hooknum = NF_IP_LOCAL_OUT, |
| .priority = NF_IP_PRI_RAW, |
| .owner = THIS_MODULE, |
| }, |
| }; |
| |
| static int __init init(void) |
| { |
| int ret; |
| |
| /* Register table */ |
| ret = ipt_register_table(&packet_raw, &initial_table.repl); |
| if (ret < 0) |
| return ret; |
| |
| /* Register hooks */ |
| ret = nf_register_hook(&ipt_ops[0]); |
| if (ret < 0) |
| goto cleanup_table; |
| |
| ret = nf_register_hook(&ipt_ops[1]); |
| if (ret < 0) |
| goto cleanup_hook0; |
| |
| return ret; |
| |
| cleanup_hook0: |
| nf_unregister_hook(&ipt_ops[0]); |
| cleanup_table: |
| ipt_unregister_table(&packet_raw); |
| |
| return ret; |
| } |
| |
| static void __exit fini(void) |
| { |
| unsigned int i; |
| |
| for (i = 0; i < sizeof(ipt_ops)/sizeof(struct nf_hook_ops); i++) |
| nf_unregister_hook(&ipt_ops[i]); |
| |
| ipt_unregister_table(&packet_raw); |
| } |
| |
| module_init(init); |
| module_exit(fini); |
| MODULE_LICENSE("GPL"); |