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![Tomasz Bursztyka](/assets/img/avatar_default.png)
This will be useful to create network family dedicated META expression as for NFPROTO_BRIDGE for instance. Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
334 lines
7.7 KiB
C
334 lines
7.7 KiB
C
/*
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* Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
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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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* 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/dst.h>
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#include <net/sock.h>
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#include <net/tcp_states.h> /* for TCP_TIME_WAIT */
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#include <net/netfilter/nf_tables.h>
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#include <net/netfilter/nft_meta.h>
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void nft_meta_get_eval(const struct nft_expr *expr,
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struct nft_data data[NFT_REG_MAX + 1],
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const struct nft_pktinfo *pkt)
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{
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const struct nft_meta *priv = nft_expr_priv(expr);
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const struct sk_buff *skb = pkt->skb;
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const struct net_device *in = pkt->in, *out = pkt->out;
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struct nft_data *dest = &data[priv->dreg];
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switch (priv->key) {
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case NFT_META_LEN:
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dest->data[0] = skb->len;
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break;
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case NFT_META_PROTOCOL:
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*(__be16 *)dest->data = skb->protocol;
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break;
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case NFT_META_NFPROTO:
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dest->data[0] = pkt->ops->pf;
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break;
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case NFT_META_L4PROTO:
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dest->data[0] = pkt->tprot;
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break;
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case NFT_META_PRIORITY:
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dest->data[0] = skb->priority;
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break;
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case NFT_META_MARK:
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dest->data[0] = skb->mark;
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break;
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case NFT_META_IIF:
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if (in == NULL)
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goto err;
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dest->data[0] = in->ifindex;
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break;
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case NFT_META_OIF:
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if (out == NULL)
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goto err;
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dest->data[0] = out->ifindex;
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break;
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case NFT_META_IIFNAME:
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if (in == NULL)
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goto err;
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strncpy((char *)dest->data, in->name, sizeof(dest->data));
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break;
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case NFT_META_OIFNAME:
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if (out == NULL)
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goto err;
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strncpy((char *)dest->data, out->name, sizeof(dest->data));
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break;
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case NFT_META_IIFTYPE:
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if (in == NULL)
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goto err;
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*(u16 *)dest->data = in->type;
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break;
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case NFT_META_OIFTYPE:
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if (out == NULL)
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goto err;
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*(u16 *)dest->data = out->type;
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break;
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case NFT_META_SKUID:
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if (skb->sk == NULL || skb->sk->sk_state == TCP_TIME_WAIT)
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goto err;
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read_lock_bh(&skb->sk->sk_callback_lock);
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if (skb->sk->sk_socket == NULL ||
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skb->sk->sk_socket->file == NULL) {
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read_unlock_bh(&skb->sk->sk_callback_lock);
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goto err;
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}
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dest->data[0] =
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from_kuid_munged(&init_user_ns,
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skb->sk->sk_socket->file->f_cred->fsuid);
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read_unlock_bh(&skb->sk->sk_callback_lock);
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break;
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case NFT_META_SKGID:
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if (skb->sk == NULL || skb->sk->sk_state == TCP_TIME_WAIT)
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goto err;
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read_lock_bh(&skb->sk->sk_callback_lock);
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if (skb->sk->sk_socket == NULL ||
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skb->sk->sk_socket->file == NULL) {
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read_unlock_bh(&skb->sk->sk_callback_lock);
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goto err;
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}
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dest->data[0] =
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from_kgid_munged(&init_user_ns,
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skb->sk->sk_socket->file->f_cred->fsgid);
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read_unlock_bh(&skb->sk->sk_callback_lock);
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break;
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#ifdef CONFIG_IP_ROUTE_CLASSID
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case NFT_META_RTCLASSID: {
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const struct dst_entry *dst = skb_dst(skb);
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if (dst == NULL)
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goto err;
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dest->data[0] = dst->tclassid;
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break;
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}
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#endif
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#ifdef CONFIG_NETWORK_SECMARK
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case NFT_META_SECMARK:
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dest->data[0] = skb->secmark;
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break;
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#endif
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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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data[NFT_REG_VERDICT].verdict = NFT_BREAK;
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}
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EXPORT_SYMBOL_GPL(nft_meta_get_eval);
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void nft_meta_set_eval(const struct nft_expr *expr,
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struct nft_data data[NFT_REG_MAX + 1],
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const struct nft_pktinfo *pkt)
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{
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const struct nft_meta *meta = nft_expr_priv(expr);
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struct sk_buff *skb = pkt->skb;
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u32 value = data[meta->sreg].data[0];
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switch (meta->key) {
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case NFT_META_MARK:
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skb->mark = value;
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break;
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case NFT_META_PRIORITY:
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skb->priority = value;
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break;
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case NFT_META_NFTRACE:
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skb->nf_trace = 1;
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break;
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default:
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WARN_ON(1);
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}
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}
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EXPORT_SYMBOL_GPL(nft_meta_set_eval);
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const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = {
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[NFTA_META_DREG] = { .type = NLA_U32 },
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[NFTA_META_KEY] = { .type = NLA_U32 },
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[NFTA_META_SREG] = { .type = NLA_U32 },
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};
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EXPORT_SYMBOL_GPL(nft_meta_policy);
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int nft_meta_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_meta *priv = nft_expr_priv(expr);
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int err;
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priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
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switch (priv->key) {
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case NFT_META_LEN:
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case NFT_META_PROTOCOL:
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case NFT_META_NFPROTO:
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case NFT_META_L4PROTO:
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case NFT_META_PRIORITY:
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case NFT_META_MARK:
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case NFT_META_IIF:
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case NFT_META_OIF:
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case NFT_META_IIFNAME:
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case NFT_META_OIFNAME:
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case NFT_META_IIFTYPE:
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case NFT_META_OIFTYPE:
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case NFT_META_SKUID:
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case NFT_META_SKGID:
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#ifdef CONFIG_IP_ROUTE_CLASSID
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case NFT_META_RTCLASSID:
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#endif
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#ifdef CONFIG_NETWORK_SECMARK
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case NFT_META_SECMARK:
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#endif
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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 = ntohl(nla_get_be32(tb[NFTA_META_DREG]));
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err = nft_validate_output_register(priv->dreg);
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if (err < 0)
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return err;
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err = nft_validate_data_load(ctx, priv->dreg, NULL, NFT_DATA_VALUE);
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if (err < 0)
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return err;
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return 0;
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}
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EXPORT_SYMBOL_GPL(nft_meta_get_init);
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int nft_meta_set_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_meta *priv = nft_expr_priv(expr);
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int err;
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priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
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switch (priv->key) {
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case NFT_META_MARK:
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case NFT_META_PRIORITY:
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case NFT_META_NFTRACE:
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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->sreg = ntohl(nla_get_be32(tb[NFTA_META_SREG]));
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err = nft_validate_input_register(priv->sreg);
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if (err < 0)
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return err;
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return 0;
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}
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EXPORT_SYMBOL_GPL(nft_meta_set_init);
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int nft_meta_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_meta *priv = nft_expr_priv(expr);
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if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
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goto nla_put_failure;
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if (nla_put_be32(skb, NFTA_META_DREG, htonl(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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EXPORT_SYMBOL_GPL(nft_meta_get_dump);
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int nft_meta_set_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_meta *priv = nft_expr_priv(expr);
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if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
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goto nla_put_failure;
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if (nla_put_be32(skb, NFTA_META_SREG, htonl(priv->sreg)))
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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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EXPORT_SYMBOL_GPL(nft_meta_set_dump);
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static struct nft_expr_type nft_meta_type;
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static const struct nft_expr_ops nft_meta_get_ops = {
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.type = &nft_meta_type,
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.size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
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.eval = nft_meta_get_eval,
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.init = nft_meta_get_init,
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.dump = nft_meta_get_dump,
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};
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static const struct nft_expr_ops nft_meta_set_ops = {
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.type = &nft_meta_type,
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.size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
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.eval = nft_meta_set_eval,
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.init = nft_meta_set_init,
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.dump = nft_meta_set_dump,
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};
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static const struct nft_expr_ops *
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nft_meta_select_ops(const struct nft_ctx *ctx,
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const struct nlattr * const tb[])
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{
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if (tb[NFTA_META_KEY] == NULL)
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return ERR_PTR(-EINVAL);
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if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG])
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return ERR_PTR(-EINVAL);
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if (tb[NFTA_META_DREG])
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return &nft_meta_get_ops;
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if (tb[NFTA_META_SREG])
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return &nft_meta_set_ops;
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return ERR_PTR(-EINVAL);
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}
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static struct nft_expr_type nft_meta_type __read_mostly = {
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.name = "meta",
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.select_ops = &nft_meta_select_ops,
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.policy = nft_meta_policy,
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.maxattr = NFTA_META_MAX,
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.owner = THIS_MODULE,
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};
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static int __init nft_meta_module_init(void)
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{
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return nft_register_expr(&nft_meta_type);
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}
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static void __exit nft_meta_module_exit(void)
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{
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nft_unregister_expr(&nft_meta_type);
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}
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module_init(nft_meta_module_init);
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module_exit(nft_meta_module_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
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MODULE_ALIAS_NFT_EXPR("meta");
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