Commit 384a46ea authored by Xin Long's avatar Xin Long Committed by Steffen Klassert
Browse files

esp4: add gso_segment for esp4 beet mode 



Similar to xfrm4_tunnel/transport_gso_segment(), _gso_segment()
is added to do gso_segment for esp4 beet mode. Before calling
inet_offloads[proto]->callbacks.gso_segment, it needs to do:

  - Get the upper proto from ph header to get its gso_segment
    when xo->proto is IPPROTO_BEETPH.

  - Add SKB_GSO_TCPV4 to gso_type if x->sel.family == AF_INET6
    and the proto == IPPROTO_TCP, so that the current tcp ipv4
    packet can be segmented.

  - Calculate a right value for skb->transport_header and move
    skb->data to the transport header position.

Signed-off-by: default avatarXin Long <lucien.xin@gmail.com>
Signed-off-by: default avatarSteffen Klassert <steffen.klassert@secunet.com>
parent dda520c4

net/ipv4/esp4_offload.c

+32 −0
Original line number Diff line number Diff line
@@ -132,6 +132,36 @@ static struct sk_buff *xfrm4_transport_gso_segment(struct xfrm_state *x, 
	return segs;

}



static struct sk_buff *xfrm4_beet_gso_segment(struct xfrm_state *x,

					      struct sk_buff *skb,

					      netdev_features_t features)

{

	struct xfrm_offload *xo = xfrm_offload(skb);

	struct sk_buff *segs = ERR_PTR(-EINVAL);

	const struct net_offload *ops;

	int proto = xo->proto;



	skb->transport_header += x->props.header_len;



	if (proto == IPPROTO_BEETPH) {

		struct ip_beet_phdr *ph = (struct ip_beet_phdr *)skb->data;



		skb->transport_header += ph->hdrlen * 8;

		proto = ph->nexthdr;

	} else if (x->sel.family != AF_INET6) {

		skb->transport_header -= IPV4_BEET_PHMAXLEN;

	} else if (proto == IPPROTO_TCP) {

		skb_shinfo(skb)->gso_type |= SKB_GSO_TCPV4;

	}



	__skb_pull(skb, skb_transport_offset(skb));

	ops = rcu_dereference(inet_offloads[proto]);

	if (likely(ops && ops->callbacks.gso_segment))

		segs = ops->callbacks.gso_segment(skb, features);



	return segs;

}



static struct sk_buff *xfrm4_outer_mode_gso_segment(struct xfrm_state *x,

						    struct sk_buff *skb,

						    netdev_features_t features)
@@ -141,6 +171,8 @@ static struct sk_buff *xfrm4_outer_mode_gso_segment(struct xfrm_state *x, 
		return xfrm4_tunnel_gso_segment(x, skb, features);

	case XFRM_MODE_TRANSPORT:

		return xfrm4_transport_gso_segment(x, skb, features);

	case XFRM_MODE_BEET:

		return xfrm4_beet_gso_segment(x, skb, features);

	}



	return ERR_PTR(-EOPNOTSUPP);

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