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227 lines
5.1 KiB
227 lines
5.1 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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#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/icmpv6.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 int gue6_err_proto_handler(int proto, struct sk_buff *skb, |
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struct inet6_skb_parm *opt, |
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u8 type, u8 code, int offset, __be32 info) |
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{ |
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const struct inet6_protocol *ipprot; |
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ipprot = rcu_dereference(inet6_protos[proto]); |
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if (ipprot && ipprot->err_handler) { |
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if (!ipprot->err_handler(skb, opt, type, code, offset, info)) |
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return 0; |
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} |
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return -ENOENT; |
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} |
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static int gue6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
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u8 type, u8 code, int offset, __be32 info) |
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{ |
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int transport_offset = skb_transport_offset(skb); |
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struct guehdr *guehdr; |
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size_t len, optlen; |
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int ret; |
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len = sizeof(struct udphdr) + sizeof(struct guehdr); |
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if (!pskb_may_pull(skb, transport_offset + len)) |
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return -EINVAL; |
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guehdr = (struct guehdr *)&udp_hdr(skb)[1]; |
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switch (guehdr->version) { |
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case 0: /* Full GUE header present */ |
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break; |
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case 1: { |
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/* Direct encasulation of IPv4 or IPv6 */ |
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skb_set_transport_header(skb, -(int)sizeof(struct icmp6hdr)); |
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switch (((struct iphdr *)guehdr)->version) { |
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case 4: |
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ret = gue6_err_proto_handler(IPPROTO_IPIP, skb, opt, |
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type, code, offset, info); |
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goto out; |
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case 6: |
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ret = gue6_err_proto_handler(IPPROTO_IPV6, skb, opt, |
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type, code, offset, info); |
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goto out; |
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default: |
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ret = -EOPNOTSUPP; |
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goto out; |
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} |
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} |
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default: /* Undefined version */ |
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return -EOPNOTSUPP; |
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} |
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if (guehdr->control) |
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return -ENOENT; |
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optlen = guehdr->hlen << 2; |
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if (!pskb_may_pull(skb, transport_offset + len + optlen)) |
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return -EINVAL; |
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guehdr = (struct guehdr *)&udp_hdr(skb)[1]; |
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if (validate_gue_flags(guehdr, optlen)) |
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return -EINVAL; |
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/* Handling exceptions for direct UDP encapsulation in GUE would lead to |
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* recursion. Besides, this kind of encapsulation can't even be |
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* configured currently. Discard this. |
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*/ |
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if (guehdr->proto_ctype == IPPROTO_UDP || |
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guehdr->proto_ctype == IPPROTO_UDPLITE) |
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return -EOPNOTSUPP; |
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skb_set_transport_header(skb, -(int)sizeof(struct icmp6hdr)); |
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ret = gue6_err_proto_handler(guehdr->proto_ctype, skb, |
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opt, type, code, offset, info); |
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out: |
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skb_set_transport_header(skb, transport_offset); |
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return ret; |
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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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.err_handler = gue6_err, |
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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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.err_handler = gue6_err, |
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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 <[email protected]>"); |
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MODULE_LICENSE("GPL"); |
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MODULE_DESCRIPTION("Foo over UDP (IPv6)");
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