net: Export skb_headers_offset_update

Toshiaki Makita · borkmann · commit b0768a86585d · 2018-08-10T16:12:20.000+02:00
This is needed for veth XDP which does skb_copy_expand()-like operation.

v2:
- Drop skb_copy_header part because it has already been exported now.

Signed-off-by: Toshiaki Makita &lt;makita.toshiaki@lab.ntt.co.jp&gt;
Signed-off-by: Daniel Borkmann &lt;daniel@iogearbox.net&gt;
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
@@ -1038,6 +1038,7 @@ static inline struct sk_buff *alloc_skb_fclone(unsigned int size,
 }
 
 struct sk_buff *skb_morph(struct sk_buff *dst, struct sk_buff *src);
+void skb_headers_offset_update(struct sk_buff *skb, int off);
 int skb_copy_ubufs(struct sk_buff *skb, gfp_t gfp_mask);
 struct sk_buff *skb_clone(struct sk_buff *skb, gfp_t priority);
 void skb_copy_header(struct sk_buff *new, const struct sk_buff *old);
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
@@ -1291,7 +1291,7 @@ struct sk_buff *skb_clone(struct sk_buff *skb, gfp_t gfp_mask)
 }
 EXPORT_SYMBOL(skb_clone);
 
-static void skb_headers_offset_update(struct sk_buff *skb, int off)
+void skb_headers_offset_update(struct sk_buff *skb, int off)
 {
 	/* Only adjust this if it actually is csum_start rather than csum */
 	if (skb->ip_summed == CHECKSUM_PARTIAL)
@@ -1305,6 +1305,7 @@ static void skb_headers_offset_update(struct sk_buff *skb, int off)
 	skb->inner_network_header += off;
 	skb->inner_mac_header += off;
 }
+EXPORT_SYMBOL(skb_headers_offset_update);
 
 void skb_copy_header(struct sk_buff *new, const struct sk_buff *old)
 {

Original file line number	Diff line number	Diff line change
`@@ -1038,6 +1038,7 @@ static inline struct sk_buff *alloc_skb_fclone(unsigned int size,`
`1038`	`1038`	`}`
`1039`	`1039`
`1040`	`1040`	`struct sk_buff skb_morph(struct sk_buff dst, struct sk_buff *src);`
	`1041`	`+void skb_headers_offset_update(struct sk_buff *skb, int off);`
`1041`	`1042`	`int skb_copy_ubufs(struct sk_buff *skb, gfp_t gfp_mask);`
`1042`	`1043`	`struct sk_buff skb_clone(struct sk_buff skb, gfp_t priority);`
`1043`	`1044`	`void skb_copy_header(struct sk_buff new, const struct sk_buff old);`
Original file line number	Diff line number	Diff line change
`@@ -1291,7 +1291,7 @@ struct sk_buff skb_clone(struct sk_buff skb, gfp_t gfp_mask)`
`1291`	`1291`	`}`
`1292`	`1292`	`EXPORT_SYMBOL(skb_clone);`
`1293`	`1293`
`1294`		`-static void skb_headers_offset_update(struct sk_buff *skb, int off)`
	`1294`	`+void skb_headers_offset_update(struct sk_buff *skb, int off)`
`1295`	`1295`	`{`
`1296`	`1296`	`/* Only adjust this if it actually is csum_start rather than csum */`
`1297`	`1297`	`if (skb->ip_summed == CHECKSUM_PARTIAL)`
`@@ -1305,6 +1305,7 @@ static void skb_headers_offset_update(struct sk_buff *skb, int off)`
`1305`	`1305`	`skb->inner_network_header += off;`
`1306`	`1306`	`skb->inner_mac_header += off;`
`1307`	`1307`	`}`
	`1308`	`+EXPORT_SYMBOL(skb_headers_offset_update);`
`1308`	`1309`
`1309`	`1310`	`void skb_copy_header(struct sk_buff new, const struct sk_buff old)`
`1310`	`1311`	`{`