139 lines
2.8 KiB
C
139 lines
2.8 KiB
C
#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/socket.h>
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#include <linux/skbuff.h>
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#include <linux/ip.h>
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#include <linux/udp.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <net/fou.h>
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#include <net/ip.h>
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#include <net/ip6_tunnel.h>
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#include <net/ip6_checksum.h>
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#include <net/protocol.h>
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#include <net/udp.h>
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#include <net/udp_tunnel.h>
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#if IS_ENABLED(CONFIG_IPV6_FOU_TUNNEL)
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static void fou6_build_udp(struct sk_buff *skb, struct ip_tunnel_encap *e,
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struct flowi6 *fl6, u8 *protocol, __be16 sport)
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{
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struct udphdr *uh;
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skb_push(skb, sizeof(struct udphdr));
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skb_reset_transport_header(skb);
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uh = udp_hdr(skb);
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uh->dest = e->dport;
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uh->source = sport;
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uh->len = htons(skb->len);
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udp6_set_csum(!(e->flags & TUNNEL_ENCAP_FLAG_CSUM6), skb,
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&fl6->saddr, &fl6->daddr, skb->len);
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*protocol = IPPROTO_UDP;
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}
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static int fou6_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e,
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u8 *protocol, struct flowi6 *fl6)
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{
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__be16 sport;
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int err;
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int type = e->flags & TUNNEL_ENCAP_FLAG_CSUM6 ?
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SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
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err = __fou_build_header(skb, e, protocol, &sport, type);
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if (err)
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return err;
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fou6_build_udp(skb, e, fl6, protocol, sport);
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return 0;
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}
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static int gue6_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e,
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u8 *protocol, struct flowi6 *fl6)
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{
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__be16 sport;
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int err;
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int type = e->flags & TUNNEL_ENCAP_FLAG_CSUM6 ?
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SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
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err = __gue_build_header(skb, e, protocol, &sport, type);
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if (err)
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return err;
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fou6_build_udp(skb, e, fl6, protocol, sport);
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return 0;
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}
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static const struct ip6_tnl_encap_ops fou_ip6tun_ops = {
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.encap_hlen = fou_encap_hlen,
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.build_header = fou6_build_header,
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};
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static const struct ip6_tnl_encap_ops gue_ip6tun_ops = {
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.encap_hlen = gue_encap_hlen,
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.build_header = gue6_build_header,
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};
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static int ip6_tnl_encap_add_fou_ops(void)
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{
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int ret;
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ret = ip6_tnl_encap_add_ops(&fou_ip6tun_ops, TUNNEL_ENCAP_FOU);
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if (ret < 0) {
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pr_err("can't add fou6 ops\n");
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return ret;
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}
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ret = ip6_tnl_encap_add_ops(&gue_ip6tun_ops, TUNNEL_ENCAP_GUE);
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if (ret < 0) {
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pr_err("can't add gue6 ops\n");
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ip6_tnl_encap_del_ops(&fou_ip6tun_ops, TUNNEL_ENCAP_FOU);
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return ret;
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}
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return 0;
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}
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static void ip6_tnl_encap_del_fou_ops(void)
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{
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ip6_tnl_encap_del_ops(&fou_ip6tun_ops, TUNNEL_ENCAP_FOU);
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ip6_tnl_encap_del_ops(&gue_ip6tun_ops, TUNNEL_ENCAP_GUE);
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}
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#else
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static int ip6_tnl_encap_add_fou_ops(void)
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{
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return 0;
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}
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static void ip6_tnl_encap_del_fou_ops(void)
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{
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}
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#endif
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static int __init fou6_init(void)
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{
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int ret;
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ret = ip6_tnl_encap_add_fou_ops();
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return ret;
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}
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static void __exit fou6_fini(void)
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{
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ip6_tnl_encap_del_fou_ops();
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}
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module_init(fou6_init);
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module_exit(fou6_fini);
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MODULE_AUTHOR("Tom Herbert <therbert@google.com>");
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MODULE_LICENSE("GPL");
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