netdev - [PATCH net 1/4] netfilter: nftables_offload: set address type in control dissector

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Message-Id: <20201121123601.21733-2-pablo@netfilter.org>
Date:   Sat, 21 Nov 2020 13:35:58 +0100
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     netfilter-devel@...r.kernel.org
Cc:     davem@...emloft.net, netdev@...r.kernel.org, kuba@...nel.org
Subject: [PATCH net 1/4] netfilter: nftables_offload: set address type in control dissector

If the address type is missing through the control dissector, then
matching on IPv4 and IPv6 addresses does not work. Set it accordingly so
rules that specify an IP address succesfully match on packets.

Fixes: c9626a2cbdb2 ("netfilter: nf_tables: add hardware offload support")
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
 include/net/netfilter/nf_tables_offload.h |  4 ++++
 net/netfilter/nf_tables_offload.c         | 18 ++++++++++++++++++
 net/netfilter/nft_payload.c               |  4 ++++
 3 files changed, 26 insertions(+)

diff --git a/include/net/netfilter/nf_tables_offload.h b/include/net/netfilter/nf_tables_offload.h
index ea7d1d78b92d..bddd34c5bd79 100644
--- a/include/net/netfilter/nf_tables_offload.h
+++ b/include/net/netfilter/nf_tables_offload.h
@@ -37,6 +37,7 @@ void nft_offload_update_dependency(struct nft_offload_ctx *ctx,
 
 struct nft_flow_key {
 	struct flow_dissector_key_basic			basic;
+	struct flow_dissector_key_control		control;
 	union {
 		struct flow_dissector_key_ipv4_addrs	ipv4;
 		struct flow_dissector_key_ipv6_addrs	ipv6;
@@ -62,6 +63,9 @@ struct nft_flow_rule {
 
 #define NFT_OFFLOAD_F_ACTION	(1 << 0)
 
+void nft_flow_rule_set_addr_type(struct nft_flow_rule *flow,
+				 enum flow_dissector_key_id addr_type);
+
 struct nft_rule;
 struct nft_flow_rule *nft_flow_rule_create(struct net *net, const struct nft_rule *rule);
 void nft_flow_rule_destroy(struct nft_flow_rule *flow);
diff --git a/net/netfilter/nf_tables_offload.c b/net/netfilter/nf_tables_offload.c
index 9f625724a20f..9a3c5ac057b6 100644
--- a/net/netfilter/nf_tables_offload.c
+++ b/net/netfilter/nf_tables_offload.c
@@ -28,6 +28,24 @@ static struct nft_flow_rule *nft_flow_rule_alloc(int num_actions)
 	return flow;
 }
 
+void nft_flow_rule_set_addr_type(struct nft_flow_rule *flow,
+				 enum flow_dissector_key_id addr_type)
+{
+	struct nft_flow_match *match = &flow->match;
+	struct nft_flow_key *mask = &match->mask;
+	struct nft_flow_key *key = &match->key;
+
+	if (match->dissector.used_keys & BIT(FLOW_DISSECTOR_KEY_CONTROL))
+		return;
+
+	key->control.addr_type = addr_type;
+	mask->control.addr_type = 0xffff;
+	match->dissector.used_keys |= BIT(FLOW_DISSECTOR_KEY_CONTROL);
+	match->dissector.offset[FLOW_DISSECTOR_KEY_CONTROL] =
+		offsetof(struct nft_flow_key, control);
+}
+EXPORT_SYMBOL_GPL(nft_flow_rule_set_addr_type);
+
 struct nft_flow_rule *nft_flow_rule_create(struct net *net,
 					   const struct nft_rule *rule)
 {
diff --git a/net/netfilter/nft_payload.c b/net/netfilter/nft_payload.c
index dcd3c7b8a367..bbf811d030d5 100644
--- a/net/netfilter/nft_payload.c
+++ b/net/netfilter/nft_payload.c
@@ -244,6 +244,7 @@ static int nft_payload_offload_ip(struct nft_offload_ctx *ctx,
 
 		NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_IPV4_ADDRS, ipv4, src,
 				  sizeof(struct in_addr), reg);
+		nft_flow_rule_set_addr_type(flow, FLOW_DISSECTOR_KEY_IPV4_ADDRS);
 		break;
 	case offsetof(struct iphdr, daddr):
 		if (priv->len != sizeof(struct in_addr))
@@ -251,6 +252,7 @@ static int nft_payload_offload_ip(struct nft_offload_ctx *ctx,
 
 		NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_IPV4_ADDRS, ipv4, dst,
 				  sizeof(struct in_addr), reg);
+		nft_flow_rule_set_addr_type(flow, FLOW_DISSECTOR_KEY_IPV4_ADDRS);
 		break;
 	case offsetof(struct iphdr, protocol):
 		if (priv->len != sizeof(__u8))
@@ -280,6 +282,7 @@ static int nft_payload_offload_ip6(struct nft_offload_ctx *ctx,
 
 		NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_IPV6_ADDRS, ipv6, src,
 				  sizeof(struct in6_addr), reg);
+		nft_flow_rule_set_addr_type(flow, FLOW_DISSECTOR_KEY_IPV6_ADDRS);
 		break;
 	case offsetof(struct ipv6hdr, daddr):
 		if (priv->len != sizeof(struct in6_addr))
@@ -287,6 +290,7 @@ static int nft_payload_offload_ip6(struct nft_offload_ctx *ctx,
 
 		NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_IPV6_ADDRS, ipv6, dst,
 				  sizeof(struct in6_addr), reg);
+		nft_flow_rule_set_addr_type(flow, FLOW_DISSECTOR_KEY_IPV6_ADDRS);
 		break;
 	case offsetof(struct ipv6hdr, nexthdr):
 		if (priv->len != sizeof(__u8))
-- 
2.20.1