263 static bool gtp0_validate_echo_hdr(struct gtp0_header *gtp0)  in gtp0_validate_echo_hdr()  argument
265 	return !(gtp0->tid || (gtp0->flags ^ 0x1e) ||  in gtp0_validate_echo_hdr()
266 		gtp0->number != 0xff || gtp0->flow);  in gtp0_validate_echo_hdr()
298 	struct gtp0_header *gtp0;  in gtp0_send_echo_resp()  local
304 	gtp0 = (struct gtp0_header *)(skb->data + sizeof(struct udphdr));  in gtp0_send_echo_resp()
306 	if (!gtp0_validate_echo_hdr(gtp0))  in gtp0_send_echo_resp()
309 	seq = gtp0->seq;  in gtp0_send_echo_resp()
377 	struct gtp0_header *gtp0;  in gtp0_handle_echo_resp()  local
383 	gtp0 = (struct gtp0_header *)(skb->data + sizeof(struct udphdr));  in gtp0_handle_echo_resp()
385 	if (!gtp0_validate_echo_hdr(gtp0))  in gtp0_handle_echo_resp()
412 	struct gtp0_header *gtp0;  in gtp0_udp_encap_recv()  local
418 	gtp0 = (struct gtp0_header *)(skb->data + sizeof(struct udphdr));  in gtp0_udp_encap_recv()
420 	if ((gtp0->flags >> 5) != GTP_V0)  in gtp0_udp_encap_recv()
427 	if (gtp0->type == GTP_ECHO_REQ && gtp->sk_created)  in gtp0_udp_encap_recv()
430 	if (gtp0->type == GTP_ECHO_RSP && gtp->sk_created)  in gtp0_udp_encap_recv()
433 	if (gtp0->type != GTP_TPDU)  in gtp0_udp_encap_recv()
436 	pctx = gtp0_pdp_find(gtp, be64_to_cpu(gtp0->tid));  in gtp0_udp_encap_recv()
738 	struct gtp0_header *gtp0;  in gtp0_push_header()  local
740 	gtp0 = skb_push(skb, sizeof(*gtp0));  in gtp0_push_header()
742 	gtp0->flags	= 0x1e; /* v0, GTP-non-prime. */  in gtp0_push_header()
743 	gtp0->type	= GTP_TPDU;  in gtp0_push_header()
744 	gtp0->length	= htons(payload_len);  in gtp0_push_header()
745 	gtp0->seq	= htons((atomic_inc_return(&pctx->tx_seq) - 1) % 0xffff);  in gtp0_push_header()
746 	gtp0->flow	= htons(pctx->u.v0.flow);  in gtp0_push_header()
747 	gtp0->number	= 0xff;  in gtp0_push_header()
748 	gtp0->spare[0]	= gtp0->spare[1] = gtp0->spare[2] = 0xff;  in gtp0_push_header()
749 	gtp0->tid	= cpu_to_be64(pctx->u.v0.tid);  in gtp0_push_header()