391 static bool gtp0_validate_echo_hdr(struct gtp0_header *gtp0)  in gtp0_validate_echo_hdr()  argument
393 	return !(gtp0->tid || (gtp0->flags ^ 0x1e) ||  in gtp0_validate_echo_hdr()
394 		gtp0->number != 0xff || gtp0->flow);  in gtp0_validate_echo_hdr()
455 	struct gtp0_header *gtp0;  in gtp0_send_echo_resp()  local
458 	gtp0 = (struct gtp0_header *)(skb->data + sizeof(struct udphdr));  in gtp0_send_echo_resp()
460 	if (!gtp0_validate_echo_hdr(gtp0))  in gtp0_send_echo_resp()
463 	seq = gtp0->seq;  in gtp0_send_echo_resp()
528 	struct gtp0_header *gtp0;  in gtp0_handle_echo_resp()  local
533 	gtp0 = (struct gtp0_header *)(skb->data + sizeof(struct udphdr));  in gtp0_handle_echo_resp()
535 	if (!gtp0_validate_echo_hdr(gtp0))  in gtp0_handle_echo_resp()
580 	struct gtp0_header *gtp0;  in gtp0_udp_encap_recv()  local
587 	gtp0 = (struct gtp0_header *)(skb->data + sizeof(struct udphdr));  in gtp0_udp_encap_recv()
589 	if ((gtp0->flags >> 5) != GTP_V0)  in gtp0_udp_encap_recv()
596 	if (gtp0->type == GTP_ECHO_REQ && gtp->sk_created)  in gtp0_udp_encap_recv()
599 	if (gtp0->type == GTP_ECHO_RSP && gtp->sk_created)  in gtp0_udp_encap_recv()
602 	if (gtp0->type != GTP_TPDU)  in gtp0_udp_encap_recv()
610 	pctx = gtp0_pdp_find(gtp, be64_to_cpu(gtp0->tid),  in gtp0_udp_encap_recv()
947 	struct gtp0_header *gtp0;  in gtp0_push_header()  local
949 	gtp0 = skb_push(skb, sizeof(*gtp0));  in gtp0_push_header()
951 	gtp0->flags	= 0x1e; /* v0, GTP-non-prime. */  in gtp0_push_header()
952 	gtp0->type	= GTP_TPDU;  in gtp0_push_header()
953 	gtp0->length	= htons(payload_len);  in gtp0_push_header()
954 	gtp0->seq	= htons((atomic_inc_return(&pctx->tx_seq) - 1) % 0xffff);  in gtp0_push_header()
955 	gtp0->flow	= htons(pctx->u.v0.flow);  in gtp0_push_header()
956 	gtp0->number	= 0xff;  in gtp0_push_header()
957 	gtp0->spare[0]	= gtp0->spare[1] = gtp0->spare[2] = 0xff;  in gtp0_push_header()
958 	gtp0->tid	= cpu_to_be64(pctx->u.v0.tid);  in gtp0_push_header()