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![Pablo Neira Ayuso](/assets/img/avatar_default.png)
Don't copy relevant fields from hook state structure, instead use the one that is already available in struct xt_action_param. This patch also adds a set of new wrapper functions to fetch relevant hook state structure fields. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
153 lines
3.4 KiB
C
153 lines
3.4 KiB
C
/*
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* Copyright (c) 2016 Anders K. Pedersen <akp@cohaesio.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/netlink.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter/nf_tables.h>
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#include <net/dst.h>
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#include <net/ip6_route.h>
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#include <net/route.h>
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#include <net/netfilter/nf_tables.h>
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#include <net/netfilter/nf_tables_core.h>
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struct nft_rt {
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enum nft_rt_keys key:8;
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enum nft_registers dreg:8;
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};
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void nft_rt_get_eval(const struct nft_expr *expr,
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struct nft_regs *regs,
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const struct nft_pktinfo *pkt)
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{
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const struct nft_rt *priv = nft_expr_priv(expr);
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const struct sk_buff *skb = pkt->skb;
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u32 *dest = ®s->data[priv->dreg];
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const struct dst_entry *dst;
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dst = skb_dst(skb);
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if (!dst)
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goto err;
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switch (priv->key) {
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#ifdef CONFIG_IP_ROUTE_CLASSID
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case NFT_RT_CLASSID:
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*dest = dst->tclassid;
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break;
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#endif
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case NFT_RT_NEXTHOP4:
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if (nft_pf(pkt) != NFPROTO_IPV4)
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goto err;
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*dest = rt_nexthop((const struct rtable *)dst,
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ip_hdr(skb)->daddr);
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break;
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case NFT_RT_NEXTHOP6:
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if (nft_pf(pkt) != NFPROTO_IPV6)
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goto err;
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memcpy(dest, rt6_nexthop((struct rt6_info *)dst,
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&ipv6_hdr(skb)->daddr),
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sizeof(struct in6_addr));
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break;
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default:
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WARN_ON(1);
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goto err;
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}
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return;
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err:
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regs->verdict.code = NFT_BREAK;
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}
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const struct nla_policy nft_rt_policy[NFTA_RT_MAX + 1] = {
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[NFTA_RT_DREG] = { .type = NLA_U32 },
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[NFTA_RT_KEY] = { .type = NLA_U32 },
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};
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int nft_rt_get_init(const struct nft_ctx *ctx,
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const struct nft_expr *expr,
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const struct nlattr * const tb[])
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{
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struct nft_rt *priv = nft_expr_priv(expr);
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unsigned int len;
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if (tb[NFTA_RT_KEY] == NULL ||
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tb[NFTA_RT_DREG] == NULL)
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return -EINVAL;
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priv->key = ntohl(nla_get_be32(tb[NFTA_RT_KEY]));
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switch (priv->key) {
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#ifdef CONFIG_IP_ROUTE_CLASSID
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case NFT_RT_CLASSID:
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#endif
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case NFT_RT_NEXTHOP4:
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len = sizeof(u32);
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break;
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case NFT_RT_NEXTHOP6:
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len = sizeof(struct in6_addr);
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break;
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default:
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return -EOPNOTSUPP;
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}
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priv->dreg = nft_parse_register(tb[NFTA_RT_DREG]);
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return nft_validate_register_store(ctx, priv->dreg, NULL,
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NFT_DATA_VALUE, len);
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}
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int nft_rt_get_dump(struct sk_buff *skb,
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const struct nft_expr *expr)
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{
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const struct nft_rt *priv = nft_expr_priv(expr);
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if (nla_put_be32(skb, NFTA_RT_KEY, htonl(priv->key)))
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goto nla_put_failure;
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if (nft_dump_register(skb, NFTA_RT_DREG, priv->dreg))
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goto nla_put_failure;
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return 0;
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nla_put_failure:
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return -1;
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}
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static struct nft_expr_type nft_rt_type;
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static const struct nft_expr_ops nft_rt_get_ops = {
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.type = &nft_rt_type,
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.size = NFT_EXPR_SIZE(sizeof(struct nft_rt)),
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.eval = nft_rt_get_eval,
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.init = nft_rt_get_init,
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.dump = nft_rt_get_dump,
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};
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static struct nft_expr_type nft_rt_type __read_mostly = {
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.name = "rt",
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.ops = &nft_rt_get_ops,
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.policy = nft_rt_policy,
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.maxattr = NFTA_RT_MAX,
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.owner = THIS_MODULE,
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};
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static int __init nft_rt_module_init(void)
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{
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return nft_register_expr(&nft_rt_type);
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}
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static void __exit nft_rt_module_exit(void)
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{
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nft_unregister_expr(&nft_rt_type);
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}
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module_init(nft_rt_module_init);
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module_exit(nft_rt_module_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Anders K. Pedersen <akp@cohaesio.com>");
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MODULE_ALIAS_NFT_EXPR("rt");
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