/* * net/sched/em_ipset.c ipset ematch * * Copyright (c) 2012 Florian Westphal <fw@strlen.de> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * version 2 as published by the Free Software Foundation. */ #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 (tc_skb_protocol(skb)) { 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);