Release 4.14 net/netfilter/nft_meta.c
/*
* Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
*
* 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.
*
* Development of this code funded by Astaro AG (http://www.astaro.com/)
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/netlink.h>
#include <linux/netfilter.h>
#include <linux/netfilter/nf_tables.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/smp.h>
#include <linux/static_key.h>
#include <net/dst.h>
#include <net/sock.h>
#include <net/tcp_states.h> /* for TCP_TIME_WAIT */
#include <net/netfilter/nf_tables.h>
#include <net/netfilter/nf_tables_core.h>
#include <net/netfilter/nft_meta.h>
#include <uapi/linux/netfilter_bridge.h> /* NF_BR_PRE_ROUTING */
static DEFINE_PER_CPU(struct rnd_state, nft_prandom_state);
void nft_meta_get_eval(const struct nft_expr *expr,
struct nft_regs *regs,
const struct nft_pktinfo *pkt)
{
const struct nft_meta *priv = nft_expr_priv(expr);
const struct sk_buff *skb = pkt->skb;
const struct net_device *in = nft_in(pkt), *out = nft_out(pkt);
struct sock *sk;
u32 *dest = ®s->data[priv->dreg];
switch (priv->key) {
case NFT_META_LEN:
*dest = skb->len;
break;
case NFT_META_PROTOCOL:
nft_reg_store16(dest, (__force u16)skb->protocol);
break;
case NFT_META_NFPROTO:
nft_reg_store8(dest, nft_pf(pkt));
break;
case NFT_META_L4PROTO:
if (!pkt->tprot_set)
goto err;
nft_reg_store8(dest, pkt->tprot);
break;
case NFT_META_PRIORITY:
*dest = skb->priority;
break;
case NFT_META_MARK:
*dest = skb->mark;
break;
case NFT_META_IIF:
if (in == NULL)
goto err;
*dest = in->ifindex;
break;
case NFT_META_OIF:
if (out == NULL)
goto err;
*dest = out->ifindex;
break;
case NFT_META_IIFNAME:
if (in == NULL)
goto err;
strncpy((char *)dest, in->name, IFNAMSIZ);
break;
case NFT_META_OIFNAME:
if (out == NULL)
goto err;
strncpy((char *)dest, out->name, IFNAMSIZ);
break;
case NFT_META_IIFTYPE:
if (in == NULL)
goto err;
nft_reg_store16(dest, in->type);
break;
case NFT_META_OIFTYPE:
if (out == NULL)
goto err;
nft_reg_store16(dest, out->type);
break;
case NFT_META_SKUID:
sk = skb_to_full_sk(skb);
if (!sk || !sk_fullsock(sk))
goto err;
read_lock_bh(&sk->sk_callback_lock);
if (sk->sk_socket == NULL ||
sk->sk_socket->file == NULL) {
read_unlock_bh(&sk->sk_callback_lock);
goto err;
}
*dest = from_kuid_munged(&init_user_ns,
sk->sk_socket->file->f_cred->fsuid);
read_unlock_bh(&sk->sk_callback_lock);
break;
case NFT_META_SKGID:
sk = skb_to_full_sk(skb);
if (!sk || !sk_fullsock(sk))
goto err;
read_lock_bh(&sk->sk_callback_lock);
if (sk->sk_socket == NULL ||
sk->sk_socket->file == NULL) {
read_unlock_bh(&sk->sk_callback_lock);
goto err;
}
*dest = from_kgid_munged(&init_user_ns,
sk->sk_socket->file->f_cred->fsgid);
read_unlock_bh(&sk->sk_callback_lock);
break;
#ifdef CONFIG_IP_ROUTE_CLASSID
case NFT_META_RTCLASSID: {
const struct dst_entry *dst = skb_dst(skb);
if (dst == NULL)
goto err;
*dest = dst->tclassid;
break;
}
#endif
#ifdef CONFIG_NETWORK_SECMARK
case NFT_META_SECMARK:
*dest = skb->secmark;
break;
#endif
case NFT_META_PKTTYPE:
if (skb->pkt_type != PACKET_LOOPBACK) {
nft_reg_store8(dest, skb->pkt_type);
break;
}
switch (nft_pf(pkt)) {
case NFPROTO_IPV4:
if (ipv4_is_multicast(ip_hdr(skb)->daddr))
nft_reg_store8(dest, PACKET_MULTICAST);
else
nft_reg_store8(dest, PACKET_BROADCAST);
break;
case NFPROTO_IPV6:
nft_reg_store8(dest, PACKET_MULTICAST);
break;
case NFPROTO_NETDEV:
switch (skb->protocol) {
case htons(ETH_P_IP): {
int noff = skb_network_offset(skb);
struct iphdr *iph, _iph;
iph = skb_header_pointer(skb, noff,
sizeof(_iph), &_iph);
if (!iph)
goto err;
if (ipv4_is_multicast(iph->daddr))
nft_reg_store8(dest, PACKET_MULTICAST);
else
nft_reg_store8(dest, PACKET_BROADCAST);
break;
}
case htons(ETH_P_IPV6):
nft_reg_store8(dest, PACKET_MULTICAST);
break;
default:
WARN_ON_ONCE(1);
goto err;
}
break;
default:
WARN_ON_ONCE(1);
goto err;
}
break;
case NFT_META_CPU:
*dest = raw_smp_processor_id();
break;
case NFT_META_IIFGROUP:
if (in == NULL)
goto err;
*dest = in->group;
break;
case NFT_META_OIFGROUP:
if (out == NULL)
goto err;
*dest = out->group;
break;
#ifdef CONFIG_CGROUP_NET_CLASSID
case NFT_META_CGROUP:
sk = skb_to_full_sk(skb);
if (!sk || !sk_fullsock(sk))
goto err;
*dest = sock_cgroup_classid(&sk->sk_cgrp_data);
break;
#endif
case NFT_META_PRANDOM: {
struct rnd_state *state = this_cpu_ptr(&nft_prandom_state);
*dest = prandom_u32_state(state);
break;
}
default:
WARN_ON(1);
goto err;
}
return;
err:
regs->verdict.code = NFT_BREAK;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Patrick McHardy | 501 | 57.19% | 7 | 30.43% |
| Liping Zhang | 147 | 16.78% | 2 | 8.70% |
| Ana Rey Botello | 123 | 14.04% | 4 | 17.39% |
| Eric Dumazet | 37 | 4.22% | 2 | 8.70% |
| Pablo Neira Ayuso | 31 | 3.54% | 3 | 13.04% |
| Florian Westphal | 25 | 2.85% | 1 | 4.35% |
| Mathias Krause | 5 | 0.57% | 1 | 4.35% |
| Tejun Heo | 5 | 0.57% | 1 | 4.35% |
| Paul Bolle | 1 | 0.11% | 1 | 4.35% |
| Arturo Borrero Gonzalez | 1 | 0.11% | 1 | 4.35% |
| Total | 876 | 100.00% | 23 | 100.00% |
EXPORT_SYMBOL_GPL(nft_meta_get_eval);
void nft_meta_set_eval(const struct nft_expr *expr,
struct nft_regs *regs,
const struct nft_pktinfo *pkt)
{
const struct nft_meta *meta = nft_expr_priv(expr);
struct sk_buff *skb = pkt->skb;
u32 *sreg = ®s->data[meta->sreg];
u32 value = *sreg;
u8 pkt_type;
switch (meta->key) {
case NFT_META_MARK:
skb->mark = value;
break;
case NFT_META_PRIORITY:
skb->priority = value;
break;
case NFT_META_PKTTYPE:
pkt_type = nft_reg_load8(sreg);
if (skb->pkt_type != pkt_type &&
skb_pkt_type_ok(pkt_type) &&
skb_pkt_type_ok(skb->pkt_type))
skb->pkt_type = pkt_type;
break;
case NFT_META_NFTRACE:
skb->nf_trace = !!value;
break;
default:
WARN_ON(1);
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Arturo Borrero Gonzalez | 91 | 61.49% | 1 | 16.67% |
| Florian Westphal | 25 | 16.89% | 1 | 16.67% |
| Liping Zhang | 25 | 16.89% | 2 | 33.33% |
| Patrick McHardy | 5 | 3.38% | 1 | 16.67% |
| Jamal Hadi Salim | 2 | 1.35% | 1 | 16.67% |
| Total | 148 | 100.00% | 6 | 100.00% |
EXPORT_SYMBOL_GPL(nft_meta_set_eval);
const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = {
[NFTA_META_DREG] = { .type = NLA_U32 },
[NFTA_META_KEY] = { .type = NLA_U32 },
[NFTA_META_SREG] = { .type = NLA_U32 },
};
EXPORT_SYMBOL_GPL(nft_meta_policy);
int nft_meta_get_init(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nlattr * const tb[])
{
struct nft_meta *priv = nft_expr_priv(expr);
unsigned int len;
priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
switch (priv->key) {
case NFT_META_PROTOCOL:
case NFT_META_IIFTYPE:
case NFT_META_OIFTYPE:
len = sizeof(u16);
break;
case NFT_META_NFPROTO:
case NFT_META_L4PROTO:
case NFT_META_LEN:
case NFT_META_PRIORITY:
case NFT_META_MARK:
case NFT_META_IIF:
case NFT_META_OIF:
case NFT_META_SKUID:
case NFT_META_SKGID:
#ifdef CONFIG_IP_ROUTE_CLASSID
case NFT_META_RTCLASSID:
#endif
#ifdef CONFIG_NETWORK_SECMARK
case NFT_META_SECMARK:
#endif
case NFT_META_PKTTYPE:
case NFT_META_CPU:
case NFT_META_IIFGROUP:
case NFT_META_OIFGROUP:
#ifdef CONFIG_CGROUP_NET_CLASSID
case NFT_META_CGROUP:
#endif
len = sizeof(u32);
break;
case NFT_META_IIFNAME:
case NFT_META_OIFNAME:
len = IFNAMSIZ;
break;
case NFT_META_PRANDOM:
prandom_init_once(&nft_prandom_state);
len = sizeof(u32);
break;
default:
return -EOPNOTSUPP;
}
priv->dreg = nft_parse_register(tb[NFTA_META_DREG]);
return nft_validate_register_store(ctx, priv->dreg, NULL,
NFT_DATA_VALUE, len);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Patrick McHardy | 172 | 81.52% | 7 | 46.67% |
| Florian Westphal | 17 | 8.06% | 1 | 6.67% |
| Ana Rey Botello | 15 | 7.11% | 4 | 26.67% |
| Mathias Krause | 5 | 2.37% | 1 | 6.67% |
| Arturo Borrero Gonzalez | 1 | 0.47% | 1 | 6.67% |
| Paul Bolle | 1 | 0.47% | 1 | 6.67% |
| Total | 211 | 100.00% | 15 | 100.00% |
EXPORT_SYMBOL_GPL(nft_meta_get_init);
int nft_meta_set_validate(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nft_data **data)
{
struct nft_meta *priv = nft_expr_priv(expr);
unsigned int hooks;
if (priv->key != NFT_META_PKTTYPE)
return 0;
switch (ctx->afi->family) {
case NFPROTO_BRIDGE:
hooks = 1 << NF_BR_PRE_ROUTING;
break;
case NFPROTO_NETDEV:
hooks = 1 << NF_NETDEV_INGRESS;
break;
case NFPROTO_IPV4:
case NFPROTO_IPV6:
case NFPROTO_INET:
hooks = 1 << NF_INET_PRE_ROUTING;
break;
default:
return -EOPNOTSUPP;
}
return nft_chain_validate_hooks(ctx->chain, hooks);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Florian Westphal | 59 | 53.64% | 1 | 33.33% |
| Liping Zhang | 51 | 46.36% | 2 | 66.67% |
| Total | 110 | 100.00% | 3 | 100.00% |
EXPORT_SYMBOL_GPL(nft_meta_set_validate);
int nft_meta_set_init(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nlattr * const tb[])
{
struct nft_meta *priv = nft_expr_priv(expr);
unsigned int len;
int err;
priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
switch (priv->key) {
case NFT_META_MARK:
case NFT_META_PRIORITY:
len = sizeof(u32);
break;
case NFT_META_NFTRACE:
len = sizeof(u8);
break;
case NFT_META_PKTTYPE:
len = sizeof(u8);
break;
default:
return -EOPNOTSUPP;
}
priv->sreg = nft_parse_register(tb[NFTA_META_SREG]);
err = nft_validate_register_load(priv->sreg, len);
if (err < 0)
return err;
if (priv->key == NFT_META_NFTRACE)
static_branch_inc(&nft_trace_enabled);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Arturo Borrero Gonzalez | 68 | 43.87% | 1 | 12.50% |
| Patrick McHardy | 45 | 29.03% | 4 | 50.00% |
| Florian Westphal | 25 | 16.13% | 2 | 25.00% |
| Pablo Neira Ayuso | 17 | 10.97% | 1 | 12.50% |
| Total | 155 | 100.00% | 8 | 100.00% |
EXPORT_SYMBOL_GPL(nft_meta_set_init);
int nft_meta_get_dump(struct sk_buff *skb,
const struct nft_expr *expr)
{
const struct nft_meta *priv = nft_expr_priv(expr);
if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
goto nla_put_failure;
if (nft_dump_register(skb, NFTA_META_DREG, priv->dreg))
goto nla_put_failure;
return 0;
nla_put_failure:
return -1;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Patrick McHardy | 42 | 59.15% | 2 | 66.67% |
| Arturo Borrero Gonzalez | 29 | 40.85% | 1 | 33.33% |
| Total | 71 | 100.00% | 3 | 100.00% |
EXPORT_SYMBOL_GPL(nft_meta_get_dump);
int nft_meta_set_dump(struct sk_buff *skb,
const struct nft_expr *expr)
{
const struct nft_meta *priv = nft_expr_priv(expr);
if (nla_put_be32(skb, NFTA_META_KEY, htonl(priv->key)))
goto nla_put_failure;
if (nft_dump_register(skb, NFTA_META_SREG, priv->sreg))
goto nla_put_failure;
return 0;
nla_put_failure:
return -1;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Arturo Borrero Gonzalez | 41 | 57.75% | 1 | 33.33% |
| Patrick McHardy | 30 | 42.25% | 2 | 66.67% |
| Total | 71 | 100.00% | 3 | 100.00% |
EXPORT_SYMBOL_GPL(nft_meta_set_dump);
void nft_meta_set_destroy(const struct nft_ctx *ctx,
const struct nft_expr *expr)
{
const struct nft_meta *priv = nft_expr_priv(expr);
if (priv->key == NFT_META_NFTRACE)
static_branch_dec(&nft_trace_enabled);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Florian Westphal | 42 | 100.00% | 1 | 100.00% |
| Total | 42 | 100.00% | 1 | 100.00% |
EXPORT_SYMBOL_GPL(nft_meta_set_destroy);
static struct nft_expr_type nft_meta_type;
static const struct nft_expr_ops nft_meta_get_ops = {
.type = &nft_meta_type,
.size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
.eval = nft_meta_get_eval,
.init = nft_meta_get_init,
.dump = nft_meta_get_dump,
};
static const struct nft_expr_ops nft_meta_set_ops = {
.type = &nft_meta_type,
.size = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
.eval = nft_meta_set_eval,
.init = nft_meta_set_init,
.destroy = nft_meta_set_destroy,
.dump = nft_meta_set_dump,
.validate = nft_meta_set_validate,
};
static const struct nft_expr_ops *
nft_meta_select_ops(const struct nft_ctx *ctx,
const struct nlattr * const tb[])
{
if (tb[NFTA_META_KEY] == NULL)
return ERR_PTR(-EINVAL);
if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG])
return ERR_PTR(-EINVAL);
if (tb[NFTA_META_DREG])
return &nft_meta_get_ops;
if (tb[NFTA_META_SREG])
return &nft_meta_set_ops;
return ERR_PTR(-EINVAL);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Arturo Borrero Gonzalez | 87 | 100.00% | 1 | 100.00% |
| Total | 87 | 100.00% | 1 | 100.00% |
static struct nft_expr_type nft_meta_type __read_mostly = {
.name = "meta",
.select_ops = nft_meta_select_ops,
.policy = nft_meta_policy,
.maxattr = NFTA_META_MAX,
.owner = THIS_MODULE,
};
static int __init nft_meta_module_init(void)
{
return nft_register_expr(&nft_meta_type);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Patrick McHardy | 16 | 100.00% | 2 | 100.00% |
| Total | 16 | 100.00% | 2 | 100.00% |
static void __exit nft_meta_module_exit(void)
{
nft_unregister_expr(&nft_meta_type);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Patrick McHardy | 15 | 100.00% | 2 | 100.00% |
| Total | 15 | 100.00% | 2 | 100.00% |
module_init(nft_meta_module_init);
module_exit(nft_meta_module_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
MODULE_ALIAS_NFT_EXPR("meta");
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Patrick McHardy | 992 | 46.95% | 13 | 35.14% |
| Arturo Borrero Gonzalez | 374 | 17.70% | 1 | 2.70% |
| Liping Zhang | 233 | 11.03% | 5 | 13.51% |
| Florian Westphal | 222 | 10.51% | 3 | 8.11% |
| Ana Rey Botello | 150 | 7.10% | 4 | 10.81% |
| Pablo Neira Ayuso | 48 | 2.27% | 4 | 10.81% |
| Tomasz Bursztyka | 38 | 1.80% | 1 | 2.70% |
| Eric Dumazet | 37 | 1.75% | 2 | 5.41% |
| Mathias Krause | 10 | 0.47% | 1 | 2.70% |
| Tejun Heo | 5 | 0.24% | 1 | 2.70% |
| Paul Bolle | 2 | 0.09% | 1 | 2.70% |
| Jamal Hadi Salim | 2 | 0.09% | 1 | 2.70% |
| Total | 2113 | 100.00% | 37 | 100.00% |
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