diff options
Diffstat (limited to 'kernel/net/ipv4/netfilter/iptable_raw.c')
-rw-r--r-- | kernel/net/ipv4/netfilter/iptable_raw.c | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/kernel/net/ipv4/netfilter/iptable_raw.c b/kernel/net/ipv4/netfilter/iptable_raw.c new file mode 100644 index 000000000..0356e6da4 --- /dev/null +++ b/kernel/net/ipv4/netfilter/iptable_raw.c @@ -0,0 +1,89 @@ +/* + * '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> +#include <linux/slab.h> +#include <net/ip.h> + +#define RAW_VALID_HOOKS ((1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_OUT)) + +static const struct xt_table packet_raw = { + .name = "raw", + .valid_hooks = RAW_VALID_HOOKS, + .me = THIS_MODULE, + .af = NFPROTO_IPV4, + .priority = NF_IP_PRI_RAW, +}; + +/* The work comes in here from netfilter.c. */ +static unsigned int +iptable_raw_hook(const struct nf_hook_ops *ops, struct sk_buff *skb, + const struct nf_hook_state *state) +{ + const struct net *net; + + if (ops->hooknum == NF_INET_LOCAL_OUT && + (skb->len < sizeof(struct iphdr) || + ip_hdrlen(skb) < sizeof(struct iphdr))) + /* root is playing with raw sockets. */ + return NF_ACCEPT; + + net = dev_net(state->in ? state->in : state->out); + return ipt_do_table(skb, ops->hooknum, state, net->ipv4.iptable_raw); +} + +static struct nf_hook_ops *rawtable_ops __read_mostly; + +static int __net_init iptable_raw_net_init(struct net *net) +{ + struct ipt_replace *repl; + + repl = ipt_alloc_initial_table(&packet_raw); + if (repl == NULL) + return -ENOMEM; + net->ipv4.iptable_raw = + ipt_register_table(net, &packet_raw, repl); + kfree(repl); + return PTR_ERR_OR_ZERO(net->ipv4.iptable_raw); +} + +static void __net_exit iptable_raw_net_exit(struct net *net) +{ + ipt_unregister_table(net, net->ipv4.iptable_raw); +} + +static struct pernet_operations iptable_raw_net_ops = { + .init = iptable_raw_net_init, + .exit = iptable_raw_net_exit, +}; + +static int __init iptable_raw_init(void) +{ + int ret; + + ret = register_pernet_subsys(&iptable_raw_net_ops); + if (ret < 0) + return ret; + + /* Register hooks */ + rawtable_ops = xt_hook_link(&packet_raw, iptable_raw_hook); + if (IS_ERR(rawtable_ops)) { + ret = PTR_ERR(rawtable_ops); + unregister_pernet_subsys(&iptable_raw_net_ops); + } + + return ret; +} + +static void __exit iptable_raw_fini(void) +{ + xt_hook_unlink(&packet_raw, rawtable_ops); + unregister_pernet_subsys(&iptable_raw_net_ops); +} + +module_init(iptable_raw_init); +module_exit(iptable_raw_fini); +MODULE_LICENSE("GPL"); |