1 /* SPDX-License-Identifier: GPL-2.0-or-later */
33  *	struct udp_skb_cb  -  UDP(-Lite) private variables
36  *	@cscov:       checksum coverage length (UDP-Lite only)
49 #define UDP_SKB_CB(__skb)	((struct udp_skb_cb *)((__skb)->cb))
52  *	struct udp_hslot - UDP hash slot
65  *	struct udp_table - UDP table
83 	return &table->hash[udp_hashfn(net, num, table->mask)];  in udp_hashslot()
92 	return &table->hash2[hash & table->mask];  in udp_hashslot2()
107  *	Generic checksumming routines for UDP(-Lite) v4 and v6
111 	return (UDP_SKB_CB(skb)->cscov == skb->len ?  in __udp_lib_checksum_complete()
113 		__skb_checksum_complete_head(skb, UDP_SKB_CB(skb)->cscov));  in __udp_lib_checksum_complete()
123  * 	udp_csum_outgoing  -  compute UDPv4/v6 checksum over fragments
125  * 	@skb: 	sk_buff containing the filled-in UDP header
132 	skb_queue_walk(&sk->sk_write_queue, skb) {  in udp_csum_outgoing()
133 		csum = csum_add(csum, skb->csum);  in udp_csum_outgoing()
141 				   sizeof(struct udphdr), skb->csum);  in udp_csum()
143 	for (skb = skb_shinfo(skb)->frag_list; skb; skb = skb->next) {  in udp_csum()
144 		csum = csum_add(csum, skb->csum);  in udp_csum()
160 	if (!skb->csum_valid && skb->ip_summed == CHECKSUM_NONE)  in udp_csum_pull_header()
161 		skb->csum = csum_partial(skb->data, sizeof(struct udphdr),  in udp_csum_pull_header()
162 					 skb->csum);  in udp_csum_pull_header()
164 	UDP_SKB_CB(skb)->cscov -= sizeof(struct udphdr);  in udp_csum_pull_header()
198 /* hash routines shared between UDPv4/6 and UDP-Litev4/6 */
232 			 * Ethernet packet so use that to compute a hash.  in udp_flow_src_port()
234 			hash = jhash(skb->data, 2 * ETH_ALEN,  in udp_flow_src_port()
235 				     (__force u32) skb->protocol);  in udp_flow_src_port()
251 	return htons((((u64) hash * (max - min)) >> 32) + min);  in udp_flow_src_port()
256 	return sk_rmem_alloc_get(sk) - READ_ONCE(udp_sk(sk)->forward_deficit);  in udp_rqueue_get()
263 	return inet_bound_dev_eq(!!READ_ONCE(net->ipv4.sysctl_udp_l3mdev_accept),  in udp_sk_bound_dev_eq()
331 /* UDP uses skb->dev_scratch to cache as much information as possible and avoid
335 	/* skb->truesize and the stateless bit are embedded in a single field;
342 	/* len and the bit needed to compute skb_csum_unnecessary
344 	 * skb->len can be stored on 16 bits since the udp header has been
355 	return (struct udp_dev_scratch *)&skb->dev_scratch;  in udp_skb_scratch()
361 	return udp_skb_scratch(skb)->len;  in udp_skb_len()
366 	return udp_skb_scratch(skb)->csum_unnecessary;  in udp_skb_csum_unnecessary()
371 	return udp_skb_scratch(skb)->is_linear;  in udp_skb_is_linear()
377 	return skb->len;  in udp_skb_len()
396 	n = copy_to_iter(skb->data + off, len, to);  in copy_linear_skb()
401 	return -EFAULT;  in copy_linear_skb()
405  * 	SNMP statistics for UDP and UDP-Lite
408 	if (is_udplite) SNMP_INC_STATS((net)->mib.udplite_statistics, field);       \
409 	else		SNMP_INC_STATS((net)->mib.udp_statistics, field);  }  while(0)
411 	if (is_udplite) __SNMP_INC_STATS((net)->mib.udplite_statistics, field);         \
412 	else		__SNMP_INC_STATS((net)->mib.udp_statistics, field);    }  while(0)
415 	if (is_udplite) __SNMP_INC_STATS((net)->mib.udplite_stats_in6, field);\
416 	else		__SNMP_INC_STATS((net)->mib.udp_stats_in6, field);  \
419 	if (__lite) SNMP_INC_STATS((net)->mib.udplite_stats_in6, field);  \
420 	else	    SNMP_INC_STATS((net)->mib.udp_stats_in6, field);      \
426 	ipv4 ? (IS_UDPLITE(sk) ? sock_net(sk)->mib.udplite_statistics :	\
427 				 sock_net(sk)->mib.udp_statistics) :	\
428 		(IS_UDPLITE(sk) ? sock_net(sk)->mib.udplite_stats_in6 :	\
429 				 sock_net(sk)->mib.udp_stats_in6);	\
434 	IS_UDPLITE(sk) ? sock_net(sk)->mib.udplite_statistics :		\
435 			 sock_net(sk)->mib.udp_statistics;		\
440 	__SNMP_INC_STATS(__UDPX_MIB(sk, (sk)->sk_family == AF_INET), field)
497 	if (skb->pkt_type == PACKET_LOOPBACK)  in udp_rcv_segment()
498 		skb->ip_summed = CHECKSUM_PARTIAL;  in udp_rcv_segment()
500 	/* the GSO CB lays after the UDP one, no need to save and restore any  in udp_rcv_segment()
501 	 * CB fragment  in udp_rcv_segment()
505 		int segs_nr = skb_shinfo(skb)->gso_segs;  in udp_rcv_segment()
507 		atomic_add(segs_nr, &sk->sk_drops);  in udp_rcv_segment()