64 void gre_build_header(struct sk_buff *skb, const struct tnl_ptk_info *tpi,  in gre_build_header()  argument
73 	greh->flags = tnl_flags_to_gre_flags(tpi->flags);  in gre_build_header()
74 	greh->protocol = tpi->proto;  in gre_build_header()
76 	if (tpi->flags&(TUNNEL_KEY|TUNNEL_CSUM|TUNNEL_SEQ)) {  in gre_build_header()
79 		if (tpi->flags&TUNNEL_SEQ) {  in gre_build_header()
80 			*ptr = tpi->seq;  in gre_build_header()
83 		if (tpi->flags&TUNNEL_KEY) {  in gre_build_header()
84 			*ptr = tpi->key;  in gre_build_header()
87 		if (tpi->flags&TUNNEL_CSUM &&  in gre_build_header()
98 static int parse_gre_header(struct sk_buff *skb, struct tnl_ptk_info *tpi,  in parse_gre_header()  argument
112 	tpi->flags = gre_flags_to_tnl_flags(greh->flags);  in parse_gre_header()
113 	hdr_len = ip_gre_calc_hlen(tpi->flags);  in parse_gre_header()
119 	tpi->proto = greh->protocol;  in parse_gre_header()
135 		tpi->key = *options;  in parse_gre_header()
138 		tpi->key = 0;  in parse_gre_header()
141 		tpi->seq = *options;  in parse_gre_header()
144 		tpi->seq = 0;  in parse_gre_header()
150 	if (greh->flags == 0 && tpi->proto == htons(ETH_P_WCCP)) {  in parse_gre_header()
151 		tpi->proto = htons(ETH_P_IP);  in parse_gre_header()
159 	return iptunnel_pull_header(skb, hdr_len, tpi->proto);  in parse_gre_header()
164 	struct tnl_ptk_info tpi;  in gre_cisco_rcv()  local
176 	if (parse_gre_header(skb, &tpi, &csum_err) < 0)  in gre_cisco_rcv()
187 		ret = proto->handler(skb, &tpi);  in gre_cisco_rcv()
219 	struct tnl_ptk_info tpi;  in gre_cisco_err()  local
223 	if (parse_gre_header(skb, &tpi, &csum_err)) {  in gre_cisco_err()
247 		if (proto->err_handler(skb, info, &tpi) == PACKET_RCVD)  in gre_cisco_err()