net/sched/act_csum.c

257 	struct udphdr *udph;
266 	 * udph->len to get the real length without any protocol check,
267 	 * UDPLITE uses udph->len for another thing,
271 	udph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*udph));
272 	if (udph == NULL)
276 	ul = ntohs(udph->len);
278 	if (udplite || udph->check) {
280 		udph->check = 0;
284 				skb->csum = csum_partial(udph, ipl - ihl, 0);
285 			else if ((ul >= sizeof(*udph)) && (ul <= ipl - ihl))
286 				skb->csum = csum_partial(udph, ul, 0);
293 			skb->csum = csum_partial(udph, ul, 0);
296 		udph->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
300 		if (!udph->check)
301 			udph->check = CSUM_MANGLED_0;
313 	struct udphdr *udph;
322 	 * udph->len to get the real length without any protocol check,
323 	 * UDPLITE uses udph->len for another thing,
327 	udph = tcf_csum_skb_nextlayer(skb, ihl, ipl, sizeof(*udph));
328 	if (udph == NULL)
332 	ul = ntohs(udph->len);
334 	udph->check = 0;
338 			skb->csum = csum_partial(udph, ipl - ihl, 0);
340 		else if ((ul >= sizeof(*udph)) && (ul <= ipl - ihl))
341 			skb->csum = csum_partial(udph, ul, 0);
349 		skb->csum = csum_partial(udph, ul, 0);
352 	udph->check = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, ul,
356 	if (!udph->check)
357 		udph->check = CSUM_MANGLED_0;