135 lines
2.9 KiB
C
135 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* net/sched/em_ipset.c ipset ematch
|
|
*
|
|
* Copyright (c) 2012 Florian Westphal <fw@strlen.de>
|
|
*/
|
|
|
|
#include <linux/gfp.h>
|
|
#include <linux/module.h>
|
|
#include <linux/types.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/string.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/netfilter/xt_set.h>
|
|
#include <linux/ipv6.h>
|
|
#include <net/ip.h>
|
|
#include <net/pkt_cls.h>
|
|
|
|
static int em_ipset_change(struct net *net, void *data, int data_len,
|
|
struct tcf_ematch *em)
|
|
{
|
|
struct xt_set_info *set = data;
|
|
ip_set_id_t index;
|
|
|
|
if (data_len != sizeof(*set))
|
|
return -EINVAL;
|
|
|
|
index = ip_set_nfnl_get_byindex(net, set->index);
|
|
if (index == IPSET_INVALID_ID)
|
|
return -ENOENT;
|
|
|
|
em->datalen = sizeof(*set);
|
|
em->data = (unsigned long)kmemdup(data, em->datalen, GFP_KERNEL);
|
|
if (em->data)
|
|
return 0;
|
|
|
|
ip_set_nfnl_put(net, index);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static void em_ipset_destroy(struct tcf_ematch *em)
|
|
{
|
|
const struct xt_set_info *set = (const void *) em->data;
|
|
if (set) {
|
|
ip_set_nfnl_put(em->net, set->index);
|
|
kfree((void *) em->data);
|
|
}
|
|
}
|
|
|
|
static int em_ipset_match(struct sk_buff *skb, struct tcf_ematch *em,
|
|
struct tcf_pkt_info *info)
|
|
{
|
|
struct ip_set_adt_opt opt;
|
|
struct xt_action_param acpar;
|
|
const struct xt_set_info *set = (const void *) em->data;
|
|
struct net_device *dev, *indev = NULL;
|
|
struct nf_hook_state state = {
|
|
.net = em->net,
|
|
};
|
|
int ret, network_offset;
|
|
|
|
switch (skb_protocol(skb, true)) {
|
|
case htons(ETH_P_IP):
|
|
state.pf = NFPROTO_IPV4;
|
|
if (!pskb_network_may_pull(skb, sizeof(struct iphdr)))
|
|
return 0;
|
|
acpar.thoff = ip_hdrlen(skb);
|
|
break;
|
|
case htons(ETH_P_IPV6):
|
|
state.pf = NFPROTO_IPV6;
|
|
if (!pskb_network_may_pull(skb, sizeof(struct ipv6hdr)))
|
|
return 0;
|
|
/* doesn't call ipv6_find_hdr() because ipset doesn't use thoff, yet */
|
|
acpar.thoff = sizeof(struct ipv6hdr);
|
|
break;
|
|
default:
|
|
return 0;
|
|
}
|
|
|
|
opt.family = state.pf;
|
|
opt.dim = set->dim;
|
|
opt.flags = set->flags;
|
|
opt.cmdflags = 0;
|
|
opt.ext.timeout = ~0u;
|
|
|
|
network_offset = skb_network_offset(skb);
|
|
skb_pull(skb, network_offset);
|
|
|
|
dev = skb->dev;
|
|
|
|
rcu_read_lock();
|
|
|
|
if (skb->skb_iif)
|
|
indev = dev_get_by_index_rcu(em->net, skb->skb_iif);
|
|
|
|
state.in = indev ? indev : dev;
|
|
state.out = dev;
|
|
acpar.state = &state;
|
|
|
|
ret = ip_set_test(set->index, skb, &acpar, &opt);
|
|
|
|
rcu_read_unlock();
|
|
|
|
skb_push(skb, network_offset);
|
|
return ret;
|
|
}
|
|
|
|
static struct tcf_ematch_ops em_ipset_ops = {
|
|
.kind = TCF_EM_IPSET,
|
|
.change = em_ipset_change,
|
|
.destroy = em_ipset_destroy,
|
|
.match = em_ipset_match,
|
|
.owner = THIS_MODULE,
|
|
.link = LIST_HEAD_INIT(em_ipset_ops.link)
|
|
};
|
|
|
|
static int __init init_em_ipset(void)
|
|
{
|
|
return tcf_em_register(&em_ipset_ops);
|
|
}
|
|
|
|
static void __exit exit_em_ipset(void)
|
|
{
|
|
tcf_em_unregister(&em_ipset_ops);
|
|
}
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Florian Westphal <fw@strlen.de>");
|
|
MODULE_DESCRIPTION("TC extended match for IP sets");
|
|
|
|
module_init(init_em_ipset);
|
|
module_exit(exit_em_ipset);
|
|
|
|
MODULE_ALIAS_TCF_EMATCH(TCF_EM_IPSET);
|