| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 1 | #include <linux/module.h> |
| 2 | #include <linux/errno.h> |
| 3 | #include <linux/socket.h> |
| 4 | #include <linux/skbuff.h> |
| 5 | #include <linux/ip.h> |
| 6 | #include <linux/udp.h> |
| 7 | #include <linux/types.h> |
| 8 | #include <linux/kernel.h> |
| 9 | #include <net/fou.h> |
| 10 | #include <net/ip.h> |
| 11 | #include <net/ip6_tunnel.h> |
| 12 | #include <net/ip6_checksum.h> |
| 13 | #include <net/protocol.h> |
| 14 | #include <net/udp.h> |
| 15 | #include <net/udp_tunnel.h> |
| 16 | |
| 17 | #if IS_ENABLED(CONFIG_IPV6_FOU_TUNNEL) |
| 18 | |
| 19 | static void fou6_build_udp(struct sk_buff *skb, struct ip_tunnel_encap *e, |
| 20 | struct flowi6 *fl6, u8 *protocol, __be16 sport) |
| 21 | { |
| 22 | struct udphdr *uh; |
| 23 | |
| 24 | skb_push(skb, sizeof(struct udphdr)); |
| 25 | skb_reset_transport_header(skb); |
| 26 | |
| 27 | uh = udp_hdr(skb); |
| 28 | |
| 29 | uh->dest = e->dport; |
| 30 | uh->source = sport; |
| 31 | uh->len = htons(skb->len); |
| 32 | udp6_set_csum(!(e->flags & TUNNEL_ENCAP_FLAG_CSUM6), skb, |
| 33 | &fl6->saddr, &fl6->daddr, skb->len); |
| 34 | |
| 35 | *protocol = IPPROTO_UDP; |
| 36 | } |
| 37 | |
| 38 | static int fou6_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e, |
| 39 | u8 *protocol, struct flowi6 *fl6) |
| 40 | { |
| 41 | __be16 sport; |
| 42 | int err; |
| 43 | int type = e->flags & TUNNEL_ENCAP_FLAG_CSUM6 ? |
| 44 | SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL; |
| 45 | |
| 46 | err = __fou_build_header(skb, e, protocol, &sport, type); |
| 47 | if (err) |
| 48 | return err; |
| 49 | |
| 50 | fou6_build_udp(skb, e, fl6, protocol, sport); |
| 51 | |
| 52 | return 0; |
| 53 | } |
| 54 | |
| 55 | static int gue6_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e, |
| 56 | u8 *protocol, struct flowi6 *fl6) |
| 57 | { |
| 58 | __be16 sport; |
| 59 | int err; |
| 60 | int type = e->flags & TUNNEL_ENCAP_FLAG_CSUM6 ? |
| 61 | SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL; |
| 62 | |
| 63 | err = __gue_build_header(skb, e, protocol, &sport, type); |
| 64 | if (err) |
| 65 | return err; |
| 66 | |
| 67 | fou6_build_udp(skb, e, fl6, protocol, sport); |
| 68 | |
| 69 | return 0; |
| 70 | } |
| 71 | |
| 72 | static const struct ip6_tnl_encap_ops fou_ip6tun_ops = { |
| 73 | .encap_hlen = fou_encap_hlen, |
| 74 | .build_header = fou6_build_header, |
| 75 | }; |
| 76 | |
| 77 | static const struct ip6_tnl_encap_ops gue_ip6tun_ops = { |
| 78 | .encap_hlen = gue_encap_hlen, |
| 79 | .build_header = gue6_build_header, |
| 80 | }; |
| 81 | |
| 82 | static int ip6_tnl_encap_add_fou_ops(void) |
| 83 | { |
| 84 | int ret; |
| 85 | |
| 86 | ret = ip6_tnl_encap_add_ops(&fou_ip6tun_ops, TUNNEL_ENCAP_FOU); |
| 87 | if (ret < 0) { |
| 88 | pr_err("can't add fou6 ops\n"); |
| 89 | return ret; |
| 90 | } |
| 91 | |
| 92 | ret = ip6_tnl_encap_add_ops(&gue_ip6tun_ops, TUNNEL_ENCAP_GUE); |
| 93 | if (ret < 0) { |
| 94 | pr_err("can't add gue6 ops\n"); |
| 95 | ip6_tnl_encap_del_ops(&fou_ip6tun_ops, TUNNEL_ENCAP_FOU); |
| 96 | return ret; |
| 97 | } |
| 98 | |
| 99 | return 0; |
| 100 | } |
| 101 | |
| 102 | static void ip6_tnl_encap_del_fou_ops(void) |
| 103 | { |
| 104 | ip6_tnl_encap_del_ops(&fou_ip6tun_ops, TUNNEL_ENCAP_FOU); |
| 105 | ip6_tnl_encap_del_ops(&gue_ip6tun_ops, TUNNEL_ENCAP_GUE); |
| 106 | } |
| 107 | |
| 108 | #else |
| 109 | |
| 110 | static int ip6_tnl_encap_add_fou_ops(void) |
| 111 | { |
| 112 | return 0; |
| 113 | } |
| 114 | |
| 115 | static void ip6_tnl_encap_del_fou_ops(void) |
| 116 | { |
| 117 | } |
| 118 | |
| 119 | #endif |
| 120 | |
| 121 | static int __init fou6_init(void) |
| 122 | { |
| 123 | int ret; |
| 124 | |
| 125 | ret = ip6_tnl_encap_add_fou_ops(); |
| 126 | |
| 127 | return ret; |
| 128 | } |
| 129 | |
| 130 | static void __exit fou6_fini(void) |
| 131 | { |
| 132 | ip6_tnl_encap_del_fou_ops(); |
| 133 | } |
| 134 | |
| 135 | module_init(fou6_init); |
| 136 | module_exit(fou6_fini); |
| 137 | MODULE_AUTHOR("Tom Herbert <therbert@google.com>"); |
| 138 | MODULE_LICENSE("GPL"); |