net/xfrm/xfrm_iptfs.c

311  * @initial_offset: the value passed in to skb_prepare_frag_walk()
320 	u32 initial_offset;
328  * @initial_offset: start the walk @initial_offset into the skb.
332  * least @initial_offset large.
334 static void iptfs_skb_prepare_frag_walk(struct sk_buff *skb, u32 initial_offset,
341 	walk->initial_offset = initial_offset;
349 		if (initial_offset >= skb_headlen(skb)) {
350 			initial_offset -= skb_headlen(skb);
354 			frag->offset += initial_offset;
355 			frag->len -= initial_offset;
357 			initial_offset = 0;
360 		initial_offset -= skb_headlen(skb);
365 		if (initial_offset >= from->len) {
366 			initial_offset -= from->len;
371 		if (initial_offset) {
372 			frag->offset += initial_offset;
373 			frag->len -= initial_offset;
374 			initial_offset = 0;
384 	offset -= walk->initial_offset;
465 	if (!walk->nr_frags || offset >= walk->total + walk->initial_offset)