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authorHuy Nguyen <huyn@nvidia.com>2021-06-14 17:33:48 +0300
committerSaeed Mahameed <saeedm@nvidia.com>2021-06-22 15:24:32 -0700
commitfa4535238fb5f306f95de89371a993057b32b2a4 (patch)
tree0f73787c8b0b8519900cbe39684fd14d054fcf61 /net/xfrm/xfrm_output.c
parentdd7cf00f87dc6cba8dd87dd6c9a5f18f187976ff (diff)
net/xfrm: Add inner_ipproto into sec_path
The inner_ipproto saves the inner IP protocol of the plain text packet. This allows vendor's IPsec feature making offload decision at skb's features_check and configuring hardware at ndo_start_xmit. For example, ConnectX6-DX IPsec device needs the plaintext's IP protocol to support partial checksum offload on VXLAN/GENEVE packet over IPsec transport mode tunnel. Signed-off-by: Raed Salem <raeds@nvidia.com> Signed-off-by: Huy Nguyen <huyn@nvidia.com> Cc: Steffen Klassert <steffen.klassert@secunet.com> Acked-by: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Diffstat (limited to 'net/xfrm/xfrm_output.c')
-rw-r--r--net/xfrm/xfrm_output.c41
1 files changed, 40 insertions, 1 deletions
diff --git a/net/xfrm/xfrm_output.c b/net/xfrm/xfrm_output.c
index e4cb0ff4dcf4..e321fc63a2e9 100644
--- a/net/xfrm/xfrm_output.c
+++ b/net/xfrm/xfrm_output.c
@@ -565,6 +565,42 @@ static int xfrm_output_gso(struct net *net, struct sock *sk, struct sk_buff *skb
return 0;
}
+/* For partial checksum offload, the outer header checksum is calculated
+ * by software and the inner header checksum is calculated by hardware.
+ * This requires hardware to know the inner packet type to calculate
+ * the inner header checksum. Save inner ip protocol here to avoid
+ * traversing the packet in the vendor's xmit code.
+ * If the encap type is IPIP, just save skb->inner_ipproto. Otherwise,
+ * get the ip protocol from the IP header.
+ */
+static void xfrm_get_inner_ipproto(struct sk_buff *skb)
+{
+ struct xfrm_offload *xo = xfrm_offload(skb);
+ const struct ethhdr *eth;
+
+ if (!xo)
+ return;
+
+ if (skb->inner_protocol_type == ENCAP_TYPE_IPPROTO) {
+ xo->inner_ipproto = skb->inner_ipproto;
+ return;
+ }
+
+ if (skb->inner_protocol_type != ENCAP_TYPE_ETHER)
+ return;
+
+ eth = (struct ethhdr *)skb_inner_mac_header(skb);
+
+ switch (ntohs(eth->h_proto)) {
+ case ETH_P_IPV6:
+ xo->inner_ipproto = inner_ipv6_hdr(skb)->nexthdr;
+ break;
+ case ETH_P_IP:
+ xo->inner_ipproto = inner_ip_hdr(skb)->protocol;
+ break;
+ }
+}
+
int xfrm_output(struct sock *sk, struct sk_buff *skb)
{
struct net *net = dev_net(skb_dst(skb)->dev);
@@ -594,12 +630,15 @@ int xfrm_output(struct sock *sk, struct sk_buff *skb)
kfree_skb(skb);
return -ENOMEM;
}
- skb->encapsulation = 1;
sp->olen++;
sp->xvec[sp->len++] = x;
xfrm_state_hold(x);
+ if (skb->encapsulation)
+ xfrm_get_inner_ipproto(skb);
+ skb->encapsulation = 1;
+
if (skb_is_gso(skb)) {
if (skb->inner_protocol)
return xfrm_output_gso(net, sk, skb);