net/ipv6/fou6.c

1 // SPDX-License-Identifier: GPL-2.0-only
7 #include <linux/udp.h>
16 #include <net/udp.h>
31 	uh->dest = e->dport;  in fou6_build_udp()
32 	uh->source = sport;  in fou6_build_udp()
33 	uh->len = htons(skb->len);  in fou6_build_udp()
34 	udp6_set_csum(!(e->flags & TUNNEL_ENCAP_FLAG_CSUM6), skb,  in fou6_build_udp()
35 		      &fl6->saddr, &fl6->daddr, skb->len);  in fou6_build_udp()
45 	int type = e->flags & TUNNEL_ENCAP_FLAG_CSUM6 ?  in fou6_build_header()
62 	int type = e->flags & TUNNEL_ENCAP_FLAG_CSUM6 ?  in gue6_build_header()
81 	if (ipprot && ipprot->err_handler) {  in gue6_err_proto_handler()
82 		if (!ipprot->err_handler(skb, opt, type, code, offset, info))  in gue6_err_proto_handler()
86 	return -ENOENT;  in gue6_err_proto_handler()
99 		return -EINVAL;  in gue6_err()
103 	switch (guehdr->version) {  in gue6_err()
108 		skb_set_transport_header(skb, -(int)sizeof(struct icmp6hdr));  in gue6_err()
110 		switch (((struct iphdr *)guehdr)->version) {  in gue6_err()
120 			ret = -EOPNOTSUPP;  in gue6_err()
125 		return -EOPNOTSUPP;  in gue6_err()
128 	if (guehdr->control)  in gue6_err()
129 		return -ENOENT;  in gue6_err()
131 	optlen = guehdr->hlen << 2;  in gue6_err()
134 		return -EINVAL;  in gue6_err()
138 		return -EINVAL;  in gue6_err()
140 	/* Handling exceptions for direct UDP encapsulation in GUE would lead to  in gue6_err()
144 	if (guehdr->proto_ctype == IPPROTO_UDP ||  in gue6_err()
145 	    guehdr->proto_ctype == IPPROTO_UDPLITE)  in gue6_err()
146 		return -EOPNOTSUPP;  in gue6_err()
148 	skb_set_transport_header(skb, -(int)sizeof(struct icmp6hdr));  in gue6_err()
149 	ret = gue6_err_proto_handler(guehdr->proto_ctype, skb,  in gue6_err()
227 MODULE_DESCRIPTION("Foo over UDP (IPv6)");