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6d4fa852a0
Can be used to match packets against netfilter ip sets created via ipset(8). skb->sk_iif is used as 'incoming interface', skb->dev is 'outgoing interface'. Since ipset is usually called from netfilter, the ematch initializes a fake xt_action_param, pulls the ip header into the linear area and also sets skb->data to the IP header (otherwise matching Layer 4 set types doesn't work). Tested-by: Mr Dash Four <mr.dash.four@googlemail.com> Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: David S. Miller <davem@davemloft.net>
136 lines
3.1 KiB
C
136 lines
3.1 KiB
C
/*
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* net/sched/em_ipset.c ipset ematch
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*
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* Copyright (c) 2012 Florian Westphal <fw@strlen.de>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*/
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#include <linux/gfp.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/skbuff.h>
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#include <linux/netfilter/xt_set.h>
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#include <linux/ipv6.h>
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#include <net/ip.h>
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#include <net/pkt_cls.h>
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static int em_ipset_change(struct tcf_proto *tp, void *data, int data_len,
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struct tcf_ematch *em)
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{
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struct xt_set_info *set = data;
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ip_set_id_t index;
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if (data_len != sizeof(*set))
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return -EINVAL;
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index = ip_set_nfnl_get_byindex(set->index);
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if (index == IPSET_INVALID_ID)
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return -ENOENT;
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em->datalen = sizeof(*set);
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em->data = (unsigned long)kmemdup(data, em->datalen, GFP_KERNEL);
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if (em->data)
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return 0;
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ip_set_nfnl_put(index);
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return -ENOMEM;
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}
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static void em_ipset_destroy(struct tcf_proto *p, struct tcf_ematch *em)
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{
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const struct xt_set_info *set = (const void *) em->data;
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if (set) {
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ip_set_nfnl_put(set->index);
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kfree((void *) em->data);
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}
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}
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static int em_ipset_match(struct sk_buff *skb, struct tcf_ematch *em,
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struct tcf_pkt_info *info)
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{
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struct ip_set_adt_opt opt;
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struct xt_action_param acpar;
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const struct xt_set_info *set = (const void *) em->data;
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struct net_device *dev, *indev = NULL;
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int ret, network_offset;
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switch (skb->protocol) {
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case htons(ETH_P_IP):
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acpar.family = NFPROTO_IPV4;
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if (!pskb_network_may_pull(skb, sizeof(struct iphdr)))
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return 0;
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acpar.thoff = ip_hdrlen(skb);
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break;
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case htons(ETH_P_IPV6):
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acpar.family = NFPROTO_IPV6;
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if (!pskb_network_may_pull(skb, sizeof(struct ipv6hdr)))
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return 0;
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/* doesn't call ipv6_find_hdr() because ipset doesn't use thoff, yet */
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acpar.thoff = sizeof(struct ipv6hdr);
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break;
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default:
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return 0;
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}
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acpar.hooknum = 0;
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opt.family = acpar.family;
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opt.dim = set->dim;
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opt.flags = set->flags;
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opt.cmdflags = 0;
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opt.timeout = ~0u;
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network_offset = skb_network_offset(skb);
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skb_pull(skb, network_offset);
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dev = skb->dev;
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rcu_read_lock();
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if (dev && skb->skb_iif)
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indev = dev_get_by_index_rcu(dev_net(dev), skb->skb_iif);
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acpar.in = indev ? indev : dev;
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acpar.out = dev;
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ret = ip_set_test(set->index, skb, &acpar, &opt);
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rcu_read_unlock();
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skb_push(skb, network_offset);
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return ret;
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}
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static struct tcf_ematch_ops em_ipset_ops = {
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.kind = TCF_EM_IPSET,
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.change = em_ipset_change,
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.destroy = em_ipset_destroy,
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.match = em_ipset_match,
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.owner = THIS_MODULE,
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.link = LIST_HEAD_INIT(em_ipset_ops.link)
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};
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static int __init init_em_ipset(void)
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{
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return tcf_em_register(&em_ipset_ops);
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}
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static void __exit exit_em_ipset(void)
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{
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tcf_em_unregister(&em_ipset_ops);
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}
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Florian Westphal <fw@strlen.de>");
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MODULE_DESCRIPTION("TC extended match for IP sets");
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module_init(init_em_ipset);
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module_exit(exit_em_ipset);
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MODULE_ALIAS_TCF_EMATCH(TCF_EM_IPSET);
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