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Date: Tue, 15 Mar 2022 10:15:11 +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 4/6] act_ct: Support GRE offload
From: Toshiaki Makita <toshiaki.makita1@...il.com>
Support GREv0 without NAT.
Signed-off-by: Toshiaki Makita <toshiaki.makita1@...il.com>
Acked-by: Paul Blakey <paulb@...dia.com>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
net/sched/act_ct.c | 115 +++++++++++++++++++++++++++++++++++----------
1 file changed, 91 insertions(+), 24 deletions(-)
diff --git a/net/sched/act_ct.c b/net/sched/act_ct.c
index 5234e8bcc764..bed0b100dd0c 100644
--- a/net/sched/act_ct.c
+++ b/net/sched/act_ct.c
@@ -415,6 +415,19 @@ static void tcf_ct_flow_table_process_conn(struct tcf_ct_flow_table *ct_ft,
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)
+ return;
+ tuple = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple;
+ /* No support for GRE v1 */
+ if (tuple->src.u.gre.key || tuple->dst.u.gre.key)
+ return;
+ break;
+ }
+#endif
default:
return;
}
@@ -434,6 +447,8 @@ tcf_ct_flow_table_fill_tuple_ipv4(struct sk_buff *skb,
struct flow_ports *ports;
unsigned int thoff;
struct iphdr *iph;
+ size_t hdrsize;
+ u8 ipproto;
if (!pskb_network_may_pull(skb, sizeof(*iph)))
return false;
@@ -445,29 +460,54 @@ tcf_ct_flow_table_fill_tuple_ipv4(struct sk_buff *skb,
unlikely(thoff != sizeof(struct iphdr)))
return false;
- if (iph->protocol != IPPROTO_TCP &&
- iph->protocol != IPPROTO_UDP)
+ ipproto = iph->protocol;
+ switch (ipproto) {
+ case IPPROTO_TCP:
+ hdrsize = sizeof(struct tcphdr);
+ break;
+ case IPPROTO_UDP:
+ hdrsize = sizeof(*ports);
+ break;
+#ifdef CONFIG_NF_CT_PROTO_GRE
+ case IPPROTO_GRE:
+ hdrsize = sizeof(struct gre_base_hdr);
+ break;
+#endif
+ default:
return false;
+ }
if (iph->ttl <= 1)
return false;
- if (!pskb_network_may_pull(skb, iph->protocol == IPPROTO_TCP ?
- thoff + sizeof(struct tcphdr) :
- thoff + sizeof(*ports)))
+ if (!pskb_network_may_pull(skb, thoff + hdrsize))
return false;
- iph = ip_hdr(skb);
- if (iph->protocol == IPPROTO_TCP)
+ switch (ipproto) {
+ case IPPROTO_TCP:
*tcph = (void *)(skb_network_header(skb) + thoff);
+ fallthrough;
+ 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 false;
+ break;
+ }
+ }
+
+ iph = ip_hdr(skb);
- 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;
return true;
}
@@ -480,36 +520,63 @@ tcf_ct_flow_table_fill_tuple_ipv6(struct sk_buff *skb,
struct flow_ports *ports;
struct ipv6hdr *ip6h;
unsigned int thoff;
+ size_t hdrsize;
+ u8 nexthdr;
if (!pskb_network_may_pull(skb, sizeof(*ip6h)))
return false;
ip6h = ipv6_hdr(skb);
+ thoff = sizeof(*ip6h);
- if (ip6h->nexthdr != IPPROTO_TCP &&
- ip6h->nexthdr != IPPROTO_UDP)
- return false;
+ nexthdr = ip6h->nexthdr;
+ switch (nexthdr) {
+ case IPPROTO_TCP:
+ hdrsize = sizeof(struct tcphdr);
+ break;
+ case IPPROTO_UDP:
+ hdrsize = sizeof(*ports);
+ break;
+#ifdef CONFIG_NF_CT_PROTO_GRE
+ case IPPROTO_GRE:
+ hdrsize = sizeof(struct gre_base_hdr);
+ break;
+#endif
+ default:
+ return -1;
+ }
if (ip6h->hop_limit <= 1)
return false;
- thoff = sizeof(*ip6h);
- if (!pskb_network_may_pull(skb, ip6h->nexthdr == IPPROTO_TCP ?
- thoff + sizeof(struct tcphdr) :
- thoff + sizeof(*ports)))
+ if (!pskb_network_may_pull(skb, thoff + hdrsize))
return false;
- ip6h = ipv6_hdr(skb);
- if (ip6h->nexthdr == IPPROTO_TCP)
+ switch (nexthdr) {
+ case IPPROTO_TCP:
*tcph = (void *)(skb_network_header(skb) + thoff);
+ fallthrough;
+ 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 false;
+ break;
+ }
+ }
+
+ ip6h = ipv6_hdr(skb);
- 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;
return true;
}
--
2.30.2
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