Allow to match on vrf slave ifindex or name.
In case there was no slave interface involved, store 0 in the
destination register just like existing iif/oif matching.
sdif(name) is restricted to the ipv4/ipv6 input and forward hooks,
as it depends on ip(6) stack parsing/storing info in skb->cb[].
Cc: Martin Willi <martin@xxxxxxxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxxx>
Cc: Shrijeet Mukherjee <shrijeet@xxxxxxxxx>
Signed-off-by: Florian Westphal <fw@xxxxxxxxx>
---
include/uapi/linux/netfilter/nf_tables.h | 4 ++
net/netfilter/nft_meta.c | 76 +++++++++++++++++++++---
2 files changed, 73 insertions(+), 7 deletions(-)
diff --git a/include/uapi/linux/netfilter/nf_tables.h b/include/uapi/linux/netfilter/nf_tables.h
index bb9b049310df..e237ecbdcd8a 100644
--- a/include/uapi/linux/netfilter/nf_tables.h
+++ b/include/uapi/linux/netfilter/nf_tables.h
@@ -805,6 +805,8 @@ enum nft_exthdr_attributes {
* @NFT_META_TIME_NS: time since epoch (in nanoseconds)
* @NFT_META_TIME_DAY: day of week (from 0 = Sunday to 6 = Saturday)
* @NFT_META_TIME_HOUR: hour of day (in seconds)
+ * @NFT_META_SDIF: slave device interface index
+ * @NFT_META_SDIFNAME: slave device interface name
*/
enum nft_meta_keys {
NFT_META_LEN,
@@ -840,6 +842,8 @@ enum nft_meta_keys {
NFT_META_TIME_NS,
NFT_META_TIME_DAY,
NFT_META_TIME_HOUR,
+ NFT_META_SDIF,
+ NFT_META_SDIFNAME,
};
/**
diff --git a/net/netfilter/nft_meta.c b/net/netfilter/nft_meta.c
index fb1a571db924..951b6e87ed5d 100644
--- a/net/netfilter/nft_meta.c
+++ b/net/netfilter/nft_meta.c
@@ -17,6 +17,7 @@
#include <linux/smp.h>
#include <linux/static_key.h>
#include <net/dst.h>
+#include <net/ip.h>
#include <net/sock.h>
#include <net/tcp_states.h> /* for TCP_TIME_WAIT */
#include <net/netfilter/nf_tables.h>
@@ -287,6 +288,28 @@ nft_meta_get_eval_rtclassid(const struct sk_buff *skb, u32 *dest)
}
#endif
+static noinline u32 nft_meta_get_eval_sdif(const struct nft_pktinfo *pkt)
+{
+ switch (nft_pf(pkt)) {
+ case NFPROTO_IPV4:
+ return inet_sdif(pkt->skb);
+ case NFPROTO_IPV6:
+ return inet6_sdif(pkt->skb);
+ }
+
+ return 0;
+}
+
+static noinline void
+nft_meta_get_eval_sdifname(u32 *dest, const struct nft_pktinfo *pkt)
+{
+ u32 sdif = nft_meta_get_eval_sdif(pkt);
+ const struct net_device *dev;
+
+ dev = sdif ? dev_get_by_index_rcu(nft_net(pkt), sdif) : NULL;
+ nft_meta_store_ifname(dest, dev);
+}
+
void nft_meta_get_eval(const struct nft_expr *expr,
struct nft_regs *regs,
const struct nft_pktinfo *pkt)
@@ -379,6 +402,12 @@ void nft_meta_get_eval(const struct nft_expr *expr,
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;
@@ -459,6 +488,7 @@ int nft_meta_get_init(const struct nft_ctx *ctx,
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
@@ -480,6 +510,7 @@ int nft_meta_get_init(const struct nft_ctx *ctx,
case NFT_META_OIFNAME:
case NFT_META_IIFKIND:
case NFT_META_OIFKIND:
+ case NFT_META_SDIFNAME:
len = IFNAMSIZ;
break;
case NFT_META_PRANDOM:
@@ -510,16 +541,28 @@ int nft_meta_get_init(const struct nft_ctx *ctx,
}
EXPORT_SYMBOL_GPL(nft_meta_get_init);
-static int nft_meta_get_validate(const struct nft_ctx *ctx,
- const struct nft_expr *expr,
- const struct nft_data **data)
+static int nft_meta_get_validate_sdif(const struct nft_ctx *ctx)
{
-#ifdef CONFIG_XFRM
- const struct nft_meta *priv = nft_expr_priv(expr);
unsigned int hooks;
- if (priv->key != NFT_META_SECPATH)
- return 0;
+ 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:
@@ -542,6 +585,25 @@ static int nft_meta_get_validate(const struct nft_ctx *ctx,
#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)
--
2.24.1
