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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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a412dbf40f
These NLA_U32 types get stored in u8 fields, reject invalid values instead of silently casting to u8. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
134 lines
3.3 KiB
C
134 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
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* Copyright (c) 2013 Eric Leblond <eric@regit.org>
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*
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* Development of this code funded by Astaro AG (http://www.astaro.com/)
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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/nft_reject.h>
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#include <linux/icmp.h>
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#include <linux/icmpv6.h>
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const struct nla_policy nft_reject_policy[NFTA_REJECT_MAX + 1] = {
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[NFTA_REJECT_TYPE] = NLA_POLICY_MAX(NLA_BE32, 255),
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[NFTA_REJECT_ICMP_CODE] = { .type = NLA_U8 },
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};
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EXPORT_SYMBOL_GPL(nft_reject_policy);
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int nft_reject_validate(const struct nft_ctx *ctx,
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const struct nft_expr *expr,
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const struct nft_data **data)
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{
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return nft_chain_validate_hooks(ctx->chain,
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(1 << NF_INET_LOCAL_IN) |
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(1 << NF_INET_FORWARD) |
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(1 << NF_INET_LOCAL_OUT) |
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(1 << NF_INET_PRE_ROUTING));
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}
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EXPORT_SYMBOL_GPL(nft_reject_validate);
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int nft_reject_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_reject *priv = nft_expr_priv(expr);
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int icmp_code;
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if (tb[NFTA_REJECT_TYPE] == NULL)
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return -EINVAL;
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priv->type = ntohl(nla_get_be32(tb[NFTA_REJECT_TYPE]));
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switch (priv->type) {
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case NFT_REJECT_ICMP_UNREACH:
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case NFT_REJECT_ICMPX_UNREACH:
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if (tb[NFTA_REJECT_ICMP_CODE] == NULL)
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return -EINVAL;
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icmp_code = nla_get_u8(tb[NFTA_REJECT_ICMP_CODE]);
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if (priv->type == NFT_REJECT_ICMPX_UNREACH &&
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icmp_code > NFT_REJECT_ICMPX_MAX)
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return -EINVAL;
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priv->icmp_code = icmp_code;
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break;
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case NFT_REJECT_TCP_RST:
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(nft_reject_init);
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int nft_reject_dump(struct sk_buff *skb,
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const struct nft_expr *expr, bool reset)
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{
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const struct nft_reject *priv = nft_expr_priv(expr);
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if (nla_put_be32(skb, NFTA_REJECT_TYPE, htonl(priv->type)))
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goto nla_put_failure;
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switch (priv->type) {
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case NFT_REJECT_ICMP_UNREACH:
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case NFT_REJECT_ICMPX_UNREACH:
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if (nla_put_u8(skb, NFTA_REJECT_ICMP_CODE, priv->icmp_code))
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goto nla_put_failure;
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break;
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default:
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break;
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}
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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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EXPORT_SYMBOL_GPL(nft_reject_dump);
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static u8 icmp_code_v4[NFT_REJECT_ICMPX_MAX + 1] = {
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[NFT_REJECT_ICMPX_NO_ROUTE] = ICMP_NET_UNREACH,
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[NFT_REJECT_ICMPX_PORT_UNREACH] = ICMP_PORT_UNREACH,
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[NFT_REJECT_ICMPX_HOST_UNREACH] = ICMP_HOST_UNREACH,
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[NFT_REJECT_ICMPX_ADMIN_PROHIBITED] = ICMP_PKT_FILTERED,
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};
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int nft_reject_icmp_code(u8 code)
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{
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if (WARN_ON_ONCE(code > NFT_REJECT_ICMPX_MAX))
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return ICMP_NET_UNREACH;
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return icmp_code_v4[code];
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}
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EXPORT_SYMBOL_GPL(nft_reject_icmp_code);
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static u8 icmp_code_v6[NFT_REJECT_ICMPX_MAX + 1] = {
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[NFT_REJECT_ICMPX_NO_ROUTE] = ICMPV6_NOROUTE,
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[NFT_REJECT_ICMPX_PORT_UNREACH] = ICMPV6_PORT_UNREACH,
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[NFT_REJECT_ICMPX_HOST_UNREACH] = ICMPV6_ADDR_UNREACH,
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[NFT_REJECT_ICMPX_ADMIN_PROHIBITED] = ICMPV6_ADM_PROHIBITED,
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};
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int nft_reject_icmpv6_code(u8 code)
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{
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if (WARN_ON_ONCE(code > NFT_REJECT_ICMPX_MAX))
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return ICMPV6_NOROUTE;
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return icmp_code_v6[code];
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}
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EXPORT_SYMBOL_GPL(nft_reject_icmpv6_code);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
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MODULE_DESCRIPTION("Netfilter x_tables over nftables module");
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