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![Pablo Neira Ayuso](/assets/img/avatar_default.png)
This new expression uses the nf_dup engine to clone packets to a given gateway. Unlike xt_TEE, we use an index to indicate output interface which should be fine at this stage. Moreover, change to the preemtion-safe this_cpu_read(nf_skb_duplicated) from nf_dup_ipv{4,6} to silence a lockdep splat. Based on the original tee expression from Arturo Borrero Gonzalez, although this patch has diverted quite a bit from this initial effort due to the change to support maps. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
108 lines
2.9 KiB
C
108 lines
2.9 KiB
C
/*
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* Copyright (c) 2015 Pablo Neira Ayuso <pablo@netfilter.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* 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/netfilter/nf_tables.h>
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#include <net/netfilter/ipv6/nf_dup_ipv6.h>
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struct nft_dup_ipv6 {
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enum nft_registers sreg_addr:8;
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enum nft_registers sreg_dev:8;
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};
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static void nft_dup_ipv6_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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struct nft_dup_ipv6 *priv = nft_expr_priv(expr);
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struct in6_addr *gw = (struct in6_addr *)®s->data[priv->sreg_addr];
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int oif = regs->data[priv->sreg_dev];
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nf_dup_ipv6(pkt->skb, pkt->ops->hooknum, gw, oif);
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}
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static int nft_dup_ipv6_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_dup_ipv6 *priv = nft_expr_priv(expr);
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int err;
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if (tb[NFTA_DUP_SREG_ADDR] == NULL)
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return -EINVAL;
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priv->sreg_addr = nft_parse_register(tb[NFTA_DUP_SREG_ADDR]);
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err = nft_validate_register_load(priv->sreg_addr, sizeof(struct in6_addr));
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if (err < 0)
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return err;
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if (tb[NFTA_DUP_SREG_DEV] != NULL) {
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priv->sreg_dev = nft_parse_register(tb[NFTA_DUP_SREG_DEV]);
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return nft_validate_register_load(priv->sreg_dev, sizeof(int));
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}
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return 0;
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}
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static int nft_dup_ipv6_dump(struct sk_buff *skb, const struct nft_expr *expr)
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{
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struct nft_dup_ipv6 *priv = nft_expr_priv(expr);
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if (nft_dump_register(skb, NFTA_DUP_SREG_ADDR, priv->sreg_addr) ||
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nft_dump_register(skb, NFTA_DUP_SREG_DEV, priv->sreg_dev))
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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_dup_ipv6_type;
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static const struct nft_expr_ops nft_dup_ipv6_ops = {
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.type = &nft_dup_ipv6_type,
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.size = NFT_EXPR_SIZE(sizeof(struct nft_dup_ipv6)),
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.eval = nft_dup_ipv6_eval,
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.init = nft_dup_ipv6_init,
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.dump = nft_dup_ipv6_dump,
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};
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static const struct nla_policy nft_dup_ipv6_policy[NFTA_DUP_MAX + 1] = {
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[NFTA_DUP_SREG_ADDR] = { .type = NLA_U32 },
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[NFTA_DUP_SREG_DEV] = { .type = NLA_U32 },
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};
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static struct nft_expr_type nft_dup_ipv6_type __read_mostly = {
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.family = NFPROTO_IPV6,
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.name = "dup",
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.ops = &nft_dup_ipv6_ops,
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.policy = nft_dup_ipv6_policy,
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.maxattr = NFTA_DUP_MAX,
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.owner = THIS_MODULE,
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};
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static int __init nft_dup_ipv6_module_init(void)
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{
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return nft_register_expr(&nft_dup_ipv6_type);
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}
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static void __exit nft_dup_ipv6_module_exit(void)
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{
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nft_unregister_expr(&nft_dup_ipv6_type);
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}
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module_init(nft_dup_ipv6_module_init);
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module_exit(nft_dup_ipv6_module_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
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MODULE_ALIAS_NFT_AF_EXPR(AF_INET6, "dup");
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