include/net/gro.h

1 /* SPDX-License-Identifier: GPL-2.0-or-later */
11 #include <net/udp.h>
16 			/* Virtual address of skb_shinfo(skb)->frags[0].page + offset. */
32 	/* This indicates where we are processing relative to skb->data. */
35 	/* This is non-zero if the packet cannot be merged with the new skb. */
44 	/* Used in ipv6_gro_receive() and foo-over-udp and esp-in-udp */
56 		/* This is non-zero if the packet may be of the same flow. */
71 		/* Used in foo-over-udp, set in udp[46]_gro_receive */
91 #define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb)
96 	return ++NAPI_GRO_CB(skb)->recursion_counter == GRO_RECURSION_LIMIT;  in gro_recursion_inc_test()
105 		NAPI_GRO_CB(skb)->flush |= 1;  in call_gro_receive()
120 		NAPI_GRO_CB(skb)->flush |= 1;  in call_gro_receive_sk()
129 	return NAPI_GRO_CB(skb)->data_offset;  in skb_gro_offset()
134 	return skb->len - NAPI_GRO_CB(skb)->data_offset;  in skb_gro_len()
139 	NAPI_GRO_CB(skb)->data_offset += len;  in skb_gro_pull()
145 	return NAPI_GRO_CB(skb)->frag0 + offset;  in skb_gro_header_fast()
150 	return NAPI_GRO_CB(skb)->frag0_len < hlen;  in skb_gro_header_hard()
155 	NAPI_GRO_CB(skb)->frag0 = NULL;  in skb_gro_frag0_invalidate()
156 	NAPI_GRO_CB(skb)->frag0_len = 0;  in skb_gro_frag0_invalidate()
166 	return skb->data + offset;  in skb_gro_header_slow()
182 	return (NAPI_GRO_CB(skb)->frag0 ?: skb->data) +  in skb_gro_network_header()
190 	return csum_tcpudp_nofold(iph->saddr, iph->daddr,  in inet_gro_compute_pseudo()
197 	if (NAPI_GRO_CB(skb)->csum_valid)  in skb_gro_postpull_rcsum()
198 		NAPI_GRO_CB(skb)->csum = wsum_negate(csum_partial(start, len,  in skb_gro_postpull_rcsum()
199 						wsum_negate(NAPI_GRO_CB(skb)->csum)));  in skb_gro_postpull_rcsum()
211 	return (NAPI_GRO_CB(skb)->gro_remcsum_start == skb_gro_offset(skb));  in skb_at_gro_remcsum_start()
218 	return ((skb->ip_summed != CHECKSUM_PARTIAL ||  in __skb_gro_checksum_validate_needed()
222 		NAPI_GRO_CB(skb)->csum_cnt == 0 &&  in __skb_gro_checksum_validate_needed()
229 	if (NAPI_GRO_CB(skb)->csum_valid &&  in __skb_gro_checksum_validate_complete()
230 	    !csum_fold(csum_add(psum, NAPI_GRO_CB(skb)->csum)))  in __skb_gro_checksum_validate_complete()
233 	NAPI_GRO_CB(skb)->csum = psum;  in __skb_gro_checksum_validate_complete()
240 	if (NAPI_GRO_CB(skb)->csum_cnt > 0) {  in skb_gro_incr_csum_unnecessary()
242 		NAPI_GRO_CB(skb)->csum_cnt--;  in skb_gro_incr_csum_unnecessary()
276 	return (NAPI_GRO_CB(skb)->csum_cnt == 0 &&  in __skb_gro_checksum_convert_check()
277 		!NAPI_GRO_CB(skb)->csum_valid);  in __skb_gro_checksum_convert_check()
283 	NAPI_GRO_CB(skb)->csum = ~pseudo;  in __skb_gro_checksum_convert()
284 	NAPI_GRO_CB(skb)->csum_valid = 1;  in __skb_gro_checksum_convert()
301 	grc->offset = 0;  in skb_gro_remcsum_init()
302 	grc->delta = 0;  in skb_gro_remcsum_init()
314 	BUG_ON(!NAPI_GRO_CB(skb)->csum_valid);  in skb_gro_remcsum_process()
317 		NAPI_GRO_CB(skb)->gro_remcsum_start = off + hdrlen + start;  in skb_gro_remcsum_process()
325 	delta = remcsum_adjust(ptr + hdrlen, NAPI_GRO_CB(skb)->csum,  in skb_gro_remcsum_process()
328 	/* Adjust skb->csum since we changed the packet */  in skb_gro_remcsum_process()
329 	NAPI_GRO_CB(skb)->csum = csum_add(NAPI_GRO_CB(skb)->csum, delta);  in skb_gro_remcsum_process()
331 	grc->offset = off + hdrlen + offset;  in skb_gro_remcsum_process()
332 	grc->delta = delta;  in skb_gro_remcsum_process()
341 	size_t plen = grc->offset + sizeof(u16);  in skb_gro_remcsum_cleanup()
343 	if (!grc->delta)  in skb_gro_remcsum_cleanup()
346 	ptr = skb_gro_header(skb, plen, grc->offset);  in skb_gro_remcsum_cleanup()
350 	remcsum_unadjust((__sum16 *)ptr, grc->delta);  in skb_gro_remcsum_cleanup()
356 	if (PTR_ERR(pp) != -EINPROGRESS)  in skb_gro_flush_final()
357 		NAPI_GRO_CB(skb)->flush |= flush;  in skb_gro_flush_final()
364 	if (PTR_ERR(pp) != -EINPROGRESS) {  in skb_gro_flush_final_remcsum()
365 		NAPI_GRO_CB(skb)->flush |= flush;  in skb_gro_flush_final_remcsum()
367 		skb->remcsum_offload = 0;  in skb_gro_flush_final_remcsum()
373 	NAPI_GRO_CB(skb)->flush |= flush;  in skb_gro_flush_final()
380 	NAPI_GRO_CB(skb)->flush |= flush;  in skb_gro_flush_final_remcsum()
382 	skb->remcsum_offload = 0;  in skb_gro_flush_final_remcsum()
404 		NAPI_GRO_CB(skb)->flush |= 1, NULL :		\
428 	return ~csum_unfold(csum_ipv6_magic(&iph->saddr, &iph->daddr,  in ip6_gro_compute_pseudo()
437 	if (!napi->rx_count)  in gro_normal_list()
439 	netif_receive_skb_list_internal(&napi->rx_list);  in gro_normal_list()
440 	INIT_LIST_HEAD(&napi->rx_list);  in gro_normal_list()
441 	napi->rx_count = 0;  in gro_normal_list()
449 	list_add_tail(&skb->list, &napi->rx_list);  in gro_normal_one()
450 	napi->rx_count += segs;  in gro_normal_one()
451 	if (napi->rx_count >= READ_ONCE(gro_normal_batch))  in gro_normal_one()
458  * The caller must verify skb_valid_dst(skb) is false and skb->dev is initialized.
463 	*iif = inet_iif(skb) ?: skb->dev->ifindex;  in inet_get_iif_sdif()
467 	if (netif_is_l3_slave(skb->dev)) {  in inet_get_iif_sdif()
468 		struct net_device *master = netdev_master_upper_dev_get_rcu(skb->dev);  in inet_get_iif_sdif()
471 		*iif = master ? master->ifindex : 0;  in inet_get_iif_sdif()
479  * The caller must verify skb_valid_dst(skb) is false and skb->dev is initialized.
484 	/* using skb->dev->ifindex because skb_dst(skb) is not initialized */  in inet6_get_iif_sdif()
485 	*iif = skb->dev->ifindex;  in inet6_get_iif_sdif()
489 	if (netif_is_l3_slave(skb->dev)) {  in inet6_get_iif_sdif()
490 		struct net_device *master = netdev_master_upper_dev_get_rcu(skb->dev);  in inet6_get_iif_sdif()
493 		*iif = master ? master->ifindex : 0;  in inet6_get_iif_sdif()