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Message-Id: <20220315091513.66544-4-pablo@netfilter.org>
Date: Tue, 15 Mar 2022 10:15:10 +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 nf-next 3/6] netfilter: flowtable: Support GRE
From: Toshiaki Makita <toshiaki.makita1@...il.com>
Support GREv0 without NAT.
Signed-off-by: Toshiaki Makita <toshiaki.makita1@...il.com>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
net/netfilter/nf_flow_table_core.c | 10 ++++-
net/netfilter/nf_flow_table_ip.c | 62 ++++++++++++++++++++++-----
net/netfilter/nf_flow_table_offload.c | 22 +++++++---
net/netfilter/nft_flow_offload.c | 13 ++++++
4 files changed, 88 insertions(+), 19 deletions(-)
diff --git a/net/netfilter/nf_flow_table_core.c b/net/netfilter/nf_flow_table_core.c
index b90eca7a2f22..e66a375075c9 100644
--- a/net/netfilter/nf_flow_table_core.c
+++ b/net/netfilter/nf_flow_table_core.c
@@ -39,8 +39,14 @@ flow_offload_fill_dir(struct flow_offload *flow,
ft->l3proto = ctt->src.l3num;
ft->l4proto = ctt->dst.protonum;
- ft->src_port = ctt->src.u.tcp.port;
- ft->dst_port = ctt->dst.u.tcp.port;
+
+ switch (ctt->dst.protonum) {
+ case IPPROTO_TCP:
+ case IPPROTO_UDP:
+ ft->src_port = ctt->src.u.tcp.port;
+ ft->dst_port = ctt->dst.u.tcp.port;
+ break;
+ }
}
struct flow_offload *flow_offload_alloc(struct nf_conn *ct)
diff --git a/net/netfilter/nf_flow_table_ip.c b/net/netfilter/nf_flow_table_ip.c
index 889cf88d3dba..6e9cacf694de 100644
--- a/net/netfilter/nf_flow_table_ip.c
+++ b/net/netfilter/nf_flow_table_ip.c
@@ -172,6 +172,7 @@ static int nf_flow_tuple_ip(struct sk_buff *skb, const struct net_device *dev,
struct flow_ports *ports;
unsigned int thoff;
struct iphdr *iph;
+ u8 ipproto;
if (!pskb_may_pull(skb, sizeof(*iph) + offset))
return -1;
@@ -185,13 +186,19 @@ static int nf_flow_tuple_ip(struct sk_buff *skb, const struct net_device *dev,
thoff += offset;
- switch (iph->protocol) {
+ ipproto = iph->protocol;
+ switch (ipproto) {
case IPPROTO_TCP:
*hdrsize = sizeof(struct tcphdr);
break;
case IPPROTO_UDP:
*hdrsize = sizeof(struct udphdr);
break;
+#ifdef CONFIG_NF_CT_PROTO_GRE
+ case IPPROTO_GRE:
+ *hdrsize = sizeof(struct gre_base_hdr);
+ break;
+#endif
default:
return -1;
}
@@ -202,15 +209,29 @@ static int nf_flow_tuple_ip(struct sk_buff *skb, const struct net_device *dev,
if (!pskb_may_pull(skb, thoff + *hdrsize))
return -1;
+ switch (ipproto) {
+ case IPPROTO_TCP:
+ case IPPROTO_UDP:
+ ports = (struct flow_ports *)(skb_network_header(skb) + thoff);
+ tuple->src_port = ports->source;
+ tuple->dst_port = ports->dest;
+ break;
+ case IPPROTO_GRE: {
+ struct gre_base_hdr *greh;
+
+ greh = (struct gre_base_hdr *)(skb_network_header(skb) + thoff);
+ if ((greh->flags & GRE_VERSION) != GRE_VERSION_0)
+ return -1;
+ break;
+ }
+ }
+
iph = (struct iphdr *)(skb_network_header(skb) + offset);
- ports = (struct flow_ports *)(skb_network_header(skb) + thoff);
tuple->src_v4.s_addr = iph->saddr;
tuple->dst_v4.s_addr = iph->daddr;
- tuple->src_port = ports->source;
- tuple->dst_port = ports->dest;
tuple->l3proto = AF_INET;
- tuple->l4proto = iph->protocol;
+ tuple->l4proto = ipproto;
tuple->iifidx = dev->ifindex;
nf_flow_tuple_encap(skb, tuple);
@@ -521,6 +542,7 @@ static int nf_flow_tuple_ipv6(struct sk_buff *skb, const struct net_device *dev,
struct flow_ports *ports;
struct ipv6hdr *ip6h;
unsigned int thoff;
+ u8 nexthdr;
thoff = sizeof(*ip6h) + offset;
if (!pskb_may_pull(skb, thoff))
@@ -528,13 +550,19 @@ static int nf_flow_tuple_ipv6(struct sk_buff *skb, const struct net_device *dev,
ip6h = (struct ipv6hdr *)(skb_network_header(skb) + offset);
- switch (ip6h->nexthdr) {
+ nexthdr = ip6h->nexthdr;
+ switch (nexthdr) {
case IPPROTO_TCP:
*hdrsize = sizeof(struct tcphdr);
break;
case IPPROTO_UDP:
*hdrsize = sizeof(struct udphdr);
break;
+#ifdef CONFIG_NF_CT_PROTO_GRE
+ case IPPROTO_GRE:
+ *hdrsize = sizeof(struct gre_base_hdr);
+ break;
+#endif
default:
return -1;
}
@@ -545,15 +573,29 @@ static int nf_flow_tuple_ipv6(struct sk_buff *skb, const struct net_device *dev,
if (!pskb_may_pull(skb, thoff + *hdrsize))
return -1;
+ switch (nexthdr) {
+ case IPPROTO_TCP:
+ case IPPROTO_UDP:
+ ports = (struct flow_ports *)(skb_network_header(skb) + thoff);
+ tuple->src_port = ports->source;
+ tuple->dst_port = ports->dest;
+ break;
+ case IPPROTO_GRE: {
+ struct gre_base_hdr *greh;
+
+ greh = (struct gre_base_hdr *)(skb_network_header(skb) + thoff);
+ if ((greh->flags & GRE_VERSION) != GRE_VERSION_0)
+ return -1;
+ break;
+ }
+ }
+
ip6h = (struct ipv6hdr *)(skb_network_header(skb) + offset);
- ports = (struct flow_ports *)(skb_network_header(skb) + thoff);
tuple->src_v6 = ip6h->saddr;
tuple->dst_v6 = ip6h->daddr;
- tuple->src_port = ports->source;
- tuple->dst_port = ports->dest;
tuple->l3proto = AF_INET6;
- tuple->l4proto = ip6h->nexthdr;
+ tuple->l4proto = nexthdr;
tuple->iifidx = dev->ifindex;
nf_flow_tuple_encap(skb, tuple);
diff --git a/net/netfilter/nf_flow_table_offload.c b/net/netfilter/nf_flow_table_offload.c
index b561e0a44a45..99f6db3757ad 100644
--- a/net/netfilter/nf_flow_table_offload.c
+++ b/net/netfilter/nf_flow_table_offload.c
@@ -170,6 +170,7 @@ static int nf_flow_rule_match(struct nf_flow_match *match,
match->dissector.used_keys |= BIT(FLOW_DISSECTOR_KEY_TCP);
break;
case IPPROTO_UDP:
+ case IPPROTO_GRE:
break;
default:
return -EOPNOTSUPP;
@@ -178,15 +179,22 @@ static int nf_flow_rule_match(struct nf_flow_match *match,
key->basic.ip_proto = tuple->l4proto;
mask->basic.ip_proto = 0xff;
- key->tp.src = tuple->src_port;
- mask->tp.src = 0xffff;
- key->tp.dst = tuple->dst_port;
- mask->tp.dst = 0xffff;
-
match->dissector.used_keys |= BIT(FLOW_DISSECTOR_KEY_META) |
BIT(FLOW_DISSECTOR_KEY_CONTROL) |
- BIT(FLOW_DISSECTOR_KEY_BASIC) |
- BIT(FLOW_DISSECTOR_KEY_PORTS);
+ BIT(FLOW_DISSECTOR_KEY_BASIC);
+
+ switch (tuple->l4proto) {
+ case IPPROTO_TCP:
+ case IPPROTO_UDP:
+ key->tp.src = tuple->src_port;
+ mask->tp.src = 0xffff;
+ key->tp.dst = tuple->dst_port;
+ mask->tp.dst = 0xffff;
+
+ match->dissector.used_keys |= BIT(FLOW_DISSECTOR_KEY_PORTS);
+ break;
+ }
+
return 0;
}
diff --git a/net/netfilter/nft_flow_offload.c b/net/netfilter/nft_flow_offload.c
index 0af34ad41479..731b5d87ef45 100644
--- a/net/netfilter/nft_flow_offload.c
+++ b/net/netfilter/nft_flow_offload.c
@@ -298,6 +298,19 @@ static void nft_flow_offload_eval(const struct nft_expr *expr,
break;
case IPPROTO_UDP:
break;
+#ifdef CONFIG_NF_CT_PROTO_GRE
+ case IPPROTO_GRE: {
+ struct nf_conntrack_tuple *tuple;
+
+ if (ct->status & IPS_NAT_MASK)
+ goto out;
+ tuple = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple;
+ /* No support for GRE v1 */
+ if (tuple->src.u.gre.key || tuple->dst.u.gre.key)
+ goto out;
+ break;
+ }
+#endif
default:
goto out;
}
--
2.30.2
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