15 static struct sk_buff *gre_gso_segment(struct sk_buff *skb,  in gre_gso_segment()  argument
18 	int tnl_hlen = skb_inner_mac_header(skb) - skb_transport_header(skb);  in gre_gso_segment()
21 	u16 mac_offset = skb->mac_header;  in gre_gso_segment()
22 	__be16 protocol = skb->protocol;  in gre_gso_segment()
23 	u16 mac_len = skb->mac_len;  in gre_gso_segment()
26 	if (!skb->encapsulation)  in gre_gso_segment()
32 	if (unlikely(!pskb_may_pull(skb, tnl_hlen)))  in gre_gso_segment()
36 	skb->encapsulation = 0;  in gre_gso_segment()
37 	SKB_GSO_CB(skb)->encap_level = 0;  in gre_gso_segment()
38 	__skb_pull(skb, tnl_hlen);  in gre_gso_segment()
39 	skb_reset_mac_header(skb);  in gre_gso_segment()
40 	skb_set_network_header(skb, skb_inner_network_offset(skb));  in gre_gso_segment()
41 	skb->mac_len = skb_inner_network_offset(skb);  in gre_gso_segment()
42 	skb->protocol = skb->inner_protocol;  in gre_gso_segment()
44 	need_csum = !!(skb_shinfo(skb)->gso_type & SKB_GSO_GRE_CSUM);  in gre_gso_segment()
45 	skb->encap_hdr_csum = need_csum;  in gre_gso_segment()
47 	features &= skb->dev->hw_enc_features;  in gre_gso_segment()
51 	need_ipsec = skb_dst(skb) && dst_xfrm(skb_dst(skb));  in gre_gso_segment()
54 			  (skb->dev->features & NETIF_F_HW_CSUM));  in gre_gso_segment()
57 	segs = skb_mac_gso_segment(skb, features);  in gre_gso_segment()
59 		skb_gso_error_unwind(skb, protocol, tnl_hlen, mac_offset,  in gre_gso_segment()
66 	outer_hlen = skb_tnl_header_len(skb);  in gre_gso_segment()
68 	skb = segs;  in gre_gso_segment()
74 		if (skb->ip_summed == CHECKSUM_PARTIAL) {  in gre_gso_segment()
75 			skb_reset_inner_headers(skb);  in gre_gso_segment()
76 			skb->encapsulation = 1;  in gre_gso_segment()
79 		skb->mac_len = mac_len;  in gre_gso_segment()
80 		skb->protocol = protocol;  in gre_gso_segment()
82 		__skb_push(skb, outer_hlen);  in gre_gso_segment()
83 		skb_reset_mac_header(skb);  in gre_gso_segment()
84 		skb_set_network_header(skb, mac_len);  in gre_gso_segment()
85 		skb_set_transport_header(skb, gre_offset);  in gre_gso_segment()
90 		greh = (struct gre_base_hdr *)skb_transport_header(skb);  in gre_gso_segment()
93 		if (gso_partial && skb_is_gso(skb)) {  in gre_gso_segment()
100 			partial_adj = skb->len + skb_headroom(skb) -  in gre_gso_segment()
101 				      SKB_GSO_CB(skb)->data_offset -  in gre_gso_segment()
102 				      skb_shinfo(skb)->gso_size;  in gre_gso_segment()
109 		if (skb->encapsulation || !offload_csum) {  in gre_gso_segment()
110 			*pcsum = gso_make_checksum(skb, 0);  in gre_gso_segment()
112 			skb->ip_summed = CHECKSUM_PARTIAL;  in gre_gso_segment()
113 			skb->csum_start = skb_transport_header(skb) - skb->head;  in gre_gso_segment()
114 			skb->csum_offset = sizeof(*greh);  in gre_gso_segment()
116 	} while ((skb = skb->next));  in gre_gso_segment()
122 				       struct sk_buff *skb)  in gre_gro_receive()  argument
133 	if (NAPI_GRO_CB(skb)->encap_mark)  in gre_gro_receive()
136 	NAPI_GRO_CB(skb)->encap_mark = 1;  in gre_gro_receive()
138 	off = skb_gro_offset(skb);  in gre_gro_receive()
140 	greh = skb_gro_header(skb, hlen, off);  in gre_gro_receive()
158 	if ((greh->flags & GRE_CSUM) && NAPI_GRO_CB(skb)->is_fou)  in gre_gro_receive()
176 	if (skb_gro_header_hard(skb, hlen)) {  in gre_gro_receive()
177 		greh = skb_gro_header_slow(skb, hlen, off);  in gre_gro_receive()
183 	if ((greh->flags & GRE_CSUM) && !NAPI_GRO_CB(skb)->flush) {  in gre_gro_receive()
184 		if (skb_gro_checksum_simple_validate(skb))  in gre_gro_receive()
187 		skb_gro_checksum_try_convert(skb, IPPROTO_GRE,  in gre_gro_receive()
221 	skb_gro_pull(skb, grehlen);  in gre_gro_receive()
224 	skb_gro_postpull_rcsum(skb, greh, grehlen);  in gre_gro_receive()
226 	pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);  in gre_gro_receive()
230 	skb_gro_flush_final(skb, pp, flush);  in gre_gro_receive()
235 static int gre_gro_complete(struct sk_buff *skb, int nhoff)  in gre_gro_complete()  argument
237 	struct gre_base_hdr *greh = (struct gre_base_hdr *)(skb->data + nhoff);  in gre_gro_complete()
243 	skb->encapsulation = 1;  in gre_gro_complete()
244 	skb_shinfo(skb)->gso_type = SKB_GSO_GRE;  in gre_gro_complete()
255 		err = ptype->callbacks.gro_complete(skb, nhoff + grehlen);  in gre_gro_complete()
257 	skb_set_inner_mac_header(skb, nhoff + grehlen);  in gre_gro_complete()