// SPDX-License-Identifier: GPL-2.0-only
|
/*
|
* Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
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* Copyright (c) 2014 Intel Corporation
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* Author: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
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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/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/random.h>
|
#include <linux/smp.h>
|
#include <linux/static_key.h>
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#include <net/dst.h>
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#include <net/ip.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/nf_tables_core.h>
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#include <net/netfilter/nft_meta.h>
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#include <net/netfilter/nf_tables_offload.h>
|
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#include <uapi/linux/netfilter_bridge.h> /* NF_BR_PRE_ROUTING */
|
|
#define NFT_META_SECS_PER_MINUTE 60
|
#define NFT_META_SECS_PER_HOUR 3600
|
#define NFT_META_SECS_PER_DAY 86400
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#define NFT_META_DAYS_PER_WEEK 7
|
|
static u8 nft_meta_weekday(void)
|
{
|
time64_t secs = ktime_get_real_seconds();
|
unsigned int dse;
|
u8 wday;
|
|
secs -= NFT_META_SECS_PER_MINUTE * sys_tz.tz_minuteswest;
|
dse = div_u64(secs, NFT_META_SECS_PER_DAY);
|
wday = (4 + dse) % NFT_META_DAYS_PER_WEEK;
|
|
return wday;
|
}
|
|
static u32 nft_meta_hour(time64_t secs)
|
{
|
struct tm tm;
|
|
time64_to_tm(secs, 0, &tm);
|
|
return tm.tm_hour * NFT_META_SECS_PER_HOUR
|
+ tm.tm_min * NFT_META_SECS_PER_MINUTE
|
+ tm.tm_sec;
|
}
|
|
static noinline_for_stack void
|
nft_meta_get_eval_time(enum nft_meta_keys key,
|
u32 *dest)
|
{
|
switch (key) {
|
case NFT_META_TIME_NS:
|
nft_reg_store64(dest, ktime_get_real_ns());
|
break;
|
case NFT_META_TIME_DAY:
|
nft_reg_store8(dest, nft_meta_weekday());
|
break;
|
case NFT_META_TIME_HOUR:
|
*dest = nft_meta_hour(ktime_get_real_seconds());
|
break;
|
default:
|
break;
|
}
|
}
|
|
static noinline bool
|
nft_meta_get_eval_pkttype_lo(const struct nft_pktinfo *pkt,
|
u32 *dest)
|
{
|
const struct sk_buff *skb = pkt->skb;
|
|
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;
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case NFPROTO_IPV6:
|
nft_reg_store8(dest, PACKET_MULTICAST);
|
break;
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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)
|
return false;
|
|
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);
|
return false;
|
}
|
break;
|
default:
|
WARN_ON_ONCE(1);
|
return false;
|
}
|
|
return true;
|
}
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|
static noinline bool
|
nft_meta_get_eval_skugid(enum nft_meta_keys key,
|
u32 *dest,
|
const struct nft_pktinfo *pkt)
|
{
|
struct sock *sk = skb_to_full_sk(pkt->skb);
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struct socket *sock;
|
|
if (!sk || !sk_fullsock(sk) || !net_eq(nft_net(pkt), sock_net(sk)))
|
return false;
|
|
read_lock_bh(&sk->sk_callback_lock);
|
sock = sk->sk_socket;
|
if (!sock || !sock->file) {
|
read_unlock_bh(&sk->sk_callback_lock);
|
return false;
|
}
|
|
switch (key) {
|
case NFT_META_SKUID:
|
*dest = from_kuid_munged(sock_net(sk)->user_ns,
|
sock->file->f_cred->fsuid);
|
break;
|
case NFT_META_SKGID:
|
*dest = from_kgid_munged(sock_net(sk)->user_ns,
|
sock->file->f_cred->fsgid);
|
break;
|
default:
|
break;
|
}
|
|
read_unlock_bh(&sk->sk_callback_lock);
|
return true;
|
}
|
|
#ifdef CONFIG_CGROUP_NET_CLASSID
|
static noinline bool
|
nft_meta_get_eval_cgroup(u32 *dest, const struct nft_pktinfo *pkt)
|
{
|
struct sock *sk = skb_to_full_sk(pkt->skb);
|
|
if (!sk || !sk_fullsock(sk) || !net_eq(nft_net(pkt), sock_net(sk)))
|
return false;
|
|
*dest = sock_cgroup_classid(&sk->sk_cgrp_data);
|
return true;
|
}
|
#endif
|
|
static noinline bool nft_meta_get_eval_kind(enum nft_meta_keys key,
|
u32 *dest,
|
const struct nft_pktinfo *pkt)
|
{
|
const struct net_device *in = nft_in(pkt), *out = nft_out(pkt);
|
|
switch (key) {
|
case NFT_META_IIFKIND:
|
if (!in || !in->rtnl_link_ops)
|
return false;
|
strncpy((char *)dest, in->rtnl_link_ops->kind, IFNAMSIZ);
|
break;
|
case NFT_META_OIFKIND:
|
if (!out || !out->rtnl_link_ops)
|
return false;
|
strncpy((char *)dest, out->rtnl_link_ops->kind, IFNAMSIZ);
|
break;
|
default:
|
return false;
|
}
|
|
return true;
|
}
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|
static void nft_meta_store_ifindex(u32 *dest, const struct net_device *dev)
|
{
|
*dest = dev ? dev->ifindex : 0;
|
}
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|
static void nft_meta_store_ifname(u32 *dest, const struct net_device *dev)
|
{
|
strncpy((char *)dest, dev ? dev->name : "", IFNAMSIZ);
|
}
|
|
static bool nft_meta_store_iftype(u32 *dest, const struct net_device *dev)
|
{
|
if (!dev)
|
return false;
|
|
nft_reg_store16(dest, dev->type);
|
return true;
|
}
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|
static bool nft_meta_store_ifgroup(u32 *dest, const struct net_device *dev)
|
{
|
if (!dev)
|
return false;
|
|
*dest = dev->group;
|
return true;
|
}
|
|
static bool nft_meta_get_eval_ifname(enum nft_meta_keys key, u32 *dest,
|
const struct nft_pktinfo *pkt)
|
{
|
switch (key) {
|
case NFT_META_IIFNAME:
|
nft_meta_store_ifname(dest, nft_in(pkt));
|
break;
|
case NFT_META_OIFNAME:
|
nft_meta_store_ifname(dest, nft_out(pkt));
|
break;
|
case NFT_META_IIF:
|
nft_meta_store_ifindex(dest, nft_in(pkt));
|
break;
|
case NFT_META_OIF:
|
nft_meta_store_ifindex(dest, nft_out(pkt));
|
break;
|
case NFT_META_IIFTYPE:
|
if (!nft_meta_store_iftype(dest, nft_in(pkt)))
|
return false;
|
break;
|
case NFT_META_OIFTYPE:
|
if (!nft_meta_store_iftype(dest, nft_out(pkt)))
|
return false;
|
break;
|
case NFT_META_IIFGROUP:
|
if (!nft_meta_store_ifgroup(dest, nft_in(pkt)))
|
return false;
|
break;
|
case NFT_META_OIFGROUP:
|
if (!nft_meta_store_ifgroup(dest, nft_out(pkt)))
|
return false;
|
break;
|
default:
|
return false;
|
}
|
|
return true;
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}
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|
#ifdef CONFIG_IP_ROUTE_CLASSID
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static noinline bool
|
nft_meta_get_eval_rtclassid(const struct sk_buff *skb, u32 *dest)
|
{
|
const struct dst_entry *dst = skb_dst(skb);
|
|
if (!dst)
|
return false;
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*dest = dst->tclassid;
|
return true;
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}
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#endif
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static noinline u32 nft_meta_get_eval_sdif(const struct nft_pktinfo *pkt)
|
{
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switch (nft_pf(pkt)) {
|
case NFPROTO_IPV4:
|
return inet_sdif(pkt->skb);
|
case NFPROTO_IPV6:
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return inet6_sdif(pkt->skb);
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}
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return 0;
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}
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static noinline void
|
nft_meta_get_eval_sdifname(u32 *dest, const struct nft_pktinfo *pkt)
|
{
|
u32 sdif = nft_meta_get_eval_sdif(pkt);
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const struct net_device *dev;
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|
dev = sdif ? dev_get_by_index_rcu(nft_net(pkt), sdif) : NULL;
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nft_meta_store_ifname(dest, dev);
|
}
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|
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;
|
u32 *dest = ®s->data[priv->dreg];
|
|
switch (priv->key) {
|
case NFT_META_LEN:
|
*dest = skb->len;
|
break;
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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:
|
case NFT_META_OIF:
|
case NFT_META_IIFNAME:
|
case NFT_META_OIFNAME:
|
case NFT_META_IIFTYPE:
|
case NFT_META_OIFTYPE:
|
case NFT_META_IIFGROUP:
|
case NFT_META_OIFGROUP:
|
if (!nft_meta_get_eval_ifname(priv->key, dest, pkt))
|
goto err;
|
break;
|
case NFT_META_SKUID:
|
case NFT_META_SKGID:
|
if (!nft_meta_get_eval_skugid(priv->key, dest, pkt))
|
goto err;
|
break;
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#ifdef CONFIG_IP_ROUTE_CLASSID
|
case NFT_META_RTCLASSID:
|
if (!nft_meta_get_eval_rtclassid(skb, dest))
|
goto err;
|
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;
|
}
|
|
if (!nft_meta_get_eval_pkttype_lo(pkt, dest))
|
goto err;
|
break;
|
case NFT_META_CPU:
|
*dest = raw_smp_processor_id();
|
break;
|
#ifdef CONFIG_CGROUP_NET_CLASSID
|
case NFT_META_CGROUP:
|
if (!nft_meta_get_eval_cgroup(dest, pkt))
|
goto err;
|
break;
|
#endif
|
case NFT_META_PRANDOM:
|
*dest = get_random_u32();
|
break;
|
#ifdef CONFIG_XFRM
|
case NFT_META_SECPATH:
|
nft_reg_store8(dest, secpath_exists(skb));
|
break;
|
#endif
|
case NFT_META_IIFKIND:
|
case NFT_META_OIFKIND:
|
if (!nft_meta_get_eval_kind(priv->key, dest, pkt))
|
goto err;
|
break;
|
case NFT_META_TIME_NS:
|
case NFT_META_TIME_DAY:
|
case NFT_META_TIME_HOUR:
|
nft_meta_get_eval_time(priv->key, dest);
|
break;
|
case NFT_META_SDIF:
|
*dest = nft_meta_get_eval_sdif(pkt);
|
break;
|
case NFT_META_SDIFNAME:
|
nft_meta_get_eval_sdifname(dest, pkt);
|
break;
|
default:
|
WARN_ON(1);
|
goto err;
|
}
|
return;
|
|
err:
|
regs->verdict.code = NFT_BREAK;
|
}
|
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 value8;
|
|
switch (meta->key) {
|
case NFT_META_MARK:
|
skb->mark = value;
|
break;
|
case NFT_META_PRIORITY:
|
skb->priority = value;
|
break;
|
case NFT_META_PKTTYPE:
|
value8 = nft_reg_load8(sreg);
|
|
if (skb->pkt_type != value8 &&
|
skb_pkt_type_ok(value8) &&
|
skb_pkt_type_ok(skb->pkt_type))
|
skb->pkt_type = value8;
|
break;
|
case NFT_META_NFTRACE:
|
value8 = nft_reg_load8(sreg);
|
|
skb->nf_trace = !!value8;
|
break;
|
#ifdef CONFIG_NETWORK_SECMARK
|
case NFT_META_SECMARK:
|
skb->secmark = value;
|
break;
|
#endif
|
default:
|
WARN_ON(1);
|
}
|
}
|
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_SDIF:
|
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:
|
case NFT_META_IIFKIND:
|
case NFT_META_OIFKIND:
|
case NFT_META_SDIFNAME:
|
len = IFNAMSIZ;
|
break;
|
case NFT_META_PRANDOM:
|
len = sizeof(u32);
|
break;
|
#ifdef CONFIG_XFRM
|
case NFT_META_SECPATH:
|
len = sizeof(u8);
|
break;
|
#endif
|
case NFT_META_TIME_NS:
|
len = sizeof(u64);
|
break;
|
case NFT_META_TIME_DAY:
|
len = sizeof(u8);
|
break;
|
case NFT_META_TIME_HOUR:
|
len = sizeof(u32);
|
break;
|
default:
|
return -EOPNOTSUPP;
|
}
|
|
return nft_parse_register_store(ctx, tb[NFTA_META_DREG], &priv->dreg,
|
NULL, NFT_DATA_VALUE, len);
|
}
|
EXPORT_SYMBOL_GPL(nft_meta_get_init);
|
|
static int nft_meta_get_validate_sdif(const struct nft_ctx *ctx)
|
{
|
unsigned int hooks;
|
|
switch (ctx->family) {
|
case NFPROTO_IPV4:
|
case NFPROTO_IPV6:
|
case NFPROTO_INET:
|
hooks = (1 << NF_INET_LOCAL_IN) |
|
(1 << NF_INET_FORWARD);
|
break;
|
default:
|
return -EOPNOTSUPP;
|
}
|
|
return nft_chain_validate_hooks(ctx->chain, hooks);
|
}
|
|
static int nft_meta_get_validate_xfrm(const struct nft_ctx *ctx)
|
{
|
#ifdef CONFIG_XFRM
|
unsigned int hooks;
|
|
switch (ctx->family) {
|
case NFPROTO_NETDEV:
|
hooks = 1 << NF_NETDEV_INGRESS;
|
break;
|
case NFPROTO_IPV4:
|
case NFPROTO_IPV6:
|
case NFPROTO_INET:
|
hooks = (1 << NF_INET_PRE_ROUTING) |
|
(1 << NF_INET_LOCAL_IN) |
|
(1 << NF_INET_FORWARD);
|
break;
|
default:
|
return -EOPNOTSUPP;
|
}
|
|
return nft_chain_validate_hooks(ctx->chain, hooks);
|
#else
|
return 0;
|
#endif
|
}
|
|
static int nft_meta_get_validate(const struct nft_ctx *ctx,
|
const struct nft_expr *expr,
|
const struct nft_data **data)
|
{
|
const struct nft_meta *priv = nft_expr_priv(expr);
|
|
switch (priv->key) {
|
case NFT_META_SECPATH:
|
return nft_meta_get_validate_xfrm(ctx);
|
case NFT_META_SDIF:
|
case NFT_META_SDIFNAME:
|
return nft_meta_get_validate_sdif(ctx);
|
default:
|
break;
|
}
|
|
return 0;
|
}
|
|
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->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);
|
}
|
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:
|
#ifdef CONFIG_NETWORK_SECMARK
|
case NFT_META_SECMARK:
|
#endif
|
len = sizeof(u32);
|
break;
|
case NFT_META_NFTRACE:
|
len = sizeof(u8);
|
break;
|
case NFT_META_PKTTYPE:
|
len = sizeof(u8);
|
break;
|
default:
|
return -EOPNOTSUPP;
|
}
|
|
err = nft_parse_register_load(tb[NFTA_META_SREG], &priv->sreg, len);
|
if (err < 0)
|
return err;
|
|
if (priv->key == NFT_META_NFTRACE)
|
static_branch_inc(&nft_trace_enabled);
|
|
return 0;
|
}
|
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;
|
}
|
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;
|
}
|
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);
|
}
|
EXPORT_SYMBOL_GPL(nft_meta_set_destroy);
|
|
static int nft_meta_get_offload(struct nft_offload_ctx *ctx,
|
struct nft_flow_rule *flow,
|
const struct nft_expr *expr)
|
{
|
const struct nft_meta *priv = nft_expr_priv(expr);
|
struct nft_offload_reg *reg = &ctx->regs[priv->dreg];
|
|
switch (priv->key) {
|
case NFT_META_PROTOCOL:
|
NFT_OFFLOAD_MATCH_EXACT(FLOW_DISSECTOR_KEY_BASIC, basic, n_proto,
|
sizeof(__u16), reg);
|
nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_NETWORK);
|
break;
|
case NFT_META_L4PROTO:
|
NFT_OFFLOAD_MATCH_EXACT(FLOW_DISSECTOR_KEY_BASIC, basic, ip_proto,
|
sizeof(__u8), reg);
|
nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_TRANSPORT);
|
break;
|
case NFT_META_IIF:
|
NFT_OFFLOAD_MATCH_EXACT(FLOW_DISSECTOR_KEY_META, meta,
|
ingress_ifindex, sizeof(__u32), reg);
|
break;
|
case NFT_META_IIFTYPE:
|
NFT_OFFLOAD_MATCH_EXACT(FLOW_DISSECTOR_KEY_META, meta,
|
ingress_iftype, sizeof(__u16), reg);
|
break;
|
default:
|
return -EOPNOTSUPP;
|
}
|
|
return 0;
|
}
|
|
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,
|
.validate = nft_meta_get_validate,
|
.offload = nft_meta_get_offload,
|
};
|
|
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 IS_ENABLED(CONFIG_NF_TABLES_BRIDGE) && IS_MODULE(CONFIG_NFT_BRIDGE_META)
|
if (ctx->family == NFPROTO_BRIDGE)
|
return ERR_PTR(-EAGAIN);
|
#endif
|
if (tb[NFTA_META_DREG])
|
return &nft_meta_get_ops;
|
|
if (tb[NFTA_META_SREG])
|
return &nft_meta_set_ops;
|
|
return ERR_PTR(-EINVAL);
|
}
|
|
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,
|
};
|
|
#ifdef CONFIG_NETWORK_SECMARK
|
struct nft_secmark {
|
u32 secid;
|
char *ctx;
|
};
|
|
static const struct nla_policy nft_secmark_policy[NFTA_SECMARK_MAX + 1] = {
|
[NFTA_SECMARK_CTX] = { .type = NLA_STRING, .len = NFT_SECMARK_CTX_MAXLEN },
|
};
|
|
static int nft_secmark_compute_secid(struct nft_secmark *priv)
|
{
|
u32 tmp_secid = 0;
|
int err;
|
|
err = security_secctx_to_secid(priv->ctx, strlen(priv->ctx), &tmp_secid);
|
if (err)
|
return err;
|
|
if (!tmp_secid)
|
return -ENOENT;
|
|
err = security_secmark_relabel_packet(tmp_secid);
|
if (err)
|
return err;
|
|
priv->secid = tmp_secid;
|
return 0;
|
}
|
|
static void nft_secmark_obj_eval(struct nft_object *obj, struct nft_regs *regs,
|
const struct nft_pktinfo *pkt)
|
{
|
const struct nft_secmark *priv = nft_obj_data(obj);
|
struct sk_buff *skb = pkt->skb;
|
|
skb->secmark = priv->secid;
|
}
|
|
static int nft_secmark_obj_init(const struct nft_ctx *ctx,
|
const struct nlattr * const tb[],
|
struct nft_object *obj)
|
{
|
struct nft_secmark *priv = nft_obj_data(obj);
|
int err;
|
|
if (tb[NFTA_SECMARK_CTX] == NULL)
|
return -EINVAL;
|
|
priv->ctx = nla_strdup(tb[NFTA_SECMARK_CTX], GFP_KERNEL);
|
if (!priv->ctx)
|
return -ENOMEM;
|
|
err = nft_secmark_compute_secid(priv);
|
if (err) {
|
kfree(priv->ctx);
|
return err;
|
}
|
|
security_secmark_refcount_inc();
|
|
return 0;
|
}
|
|
static int nft_secmark_obj_dump(struct sk_buff *skb, struct nft_object *obj,
|
bool reset)
|
{
|
struct nft_secmark *priv = nft_obj_data(obj);
|
int err;
|
|
if (nla_put_string(skb, NFTA_SECMARK_CTX, priv->ctx))
|
return -1;
|
|
if (reset) {
|
err = nft_secmark_compute_secid(priv);
|
if (err)
|
return err;
|
}
|
|
return 0;
|
}
|
|
static void nft_secmark_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)
|
{
|
struct nft_secmark *priv = nft_obj_data(obj);
|
|
security_secmark_refcount_dec();
|
|
kfree(priv->ctx);
|
}
|
|
static const struct nft_object_ops nft_secmark_obj_ops = {
|
.type = &nft_secmark_obj_type,
|
.size = sizeof(struct nft_secmark),
|
.init = nft_secmark_obj_init,
|
.eval = nft_secmark_obj_eval,
|
.dump = nft_secmark_obj_dump,
|
.destroy = nft_secmark_obj_destroy,
|
};
|
struct nft_object_type nft_secmark_obj_type __read_mostly = {
|
.type = NFT_OBJECT_SECMARK,
|
.ops = &nft_secmark_obj_ops,
|
.maxattr = NFTA_SECMARK_MAX,
|
.policy = nft_secmark_policy,
|
.owner = THIS_MODULE,
|
};
|
#endif /* CONFIG_NETWORK_SECMARK */
|
