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82a470f111
This removes the tcf_proto argument from the ematch code paths that only need it to reference the net namespace. This allows simplifying qdisc code paths especially when we need to tear down the ematch from an RCU callback. In this case we can not guarentee that the tcf_proto structure is still valid. Signed-off-by: John Fastabend <john.r.fastabend@intel.com> Acked-by: Cong Wang <cwang@twopensource.com> 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 net *net, 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(net, 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(net, index);
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return -ENOMEM;
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}
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static void em_ipset_destroy(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(em->net, 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.ext.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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