Yuxiang Zhu
b67e8a4e3e
From `ip-link(8)`:
> [no]ignore-df - enables/disables IPv4 DF
suppression on this tunnel. Normally datagrams
that exceed the MTU will be fragmented; the
presence of the DF flag inhibits this, resulting
instead in an ICMP Unreachable (Fragmentation
Required) message. Enabling this attribute causes
the DF flag to be ignored.
If this option is enabled for a GRE/GRETAP tunnel, the `DF` flag in the outer IP header
will not inherit the inner IP header's `DF` flag.
This is useful to transfer packets that exceed the MTU of the underlay
network.
140 lines
4.1 KiB
C
140 lines
4.1 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#pragma once
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#include "in-addr-util.h"
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#include "conf-parser.h"
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#include "fou-tunnel.h"
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#include "netdev-util.h"
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#include "netdev.h"
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#include "networkd-link.h"
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typedef enum Ip6TnlMode {
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NETDEV_IP6_TNL_MODE_IP6IP6,
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NETDEV_IP6_TNL_MODE_IPIP6,
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NETDEV_IP6_TNL_MODE_ANYIP6,
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_NETDEV_IP6_TNL_MODE_MAX,
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_NETDEV_IP6_TNL_MODE_INVALID = -EINVAL,
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} Ip6TnlMode;
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typedef enum IPv6FlowLabel {
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NETDEV_IPV6_FLOWLABEL_INHERIT = 0xFFFFF + 1,
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_NETDEV_IPV6_FLOWLABEL_MAX,
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_NETDEV_IPV6_FLOWLABEL_INVALID = -EINVAL,
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} IPv6FlowLabel;
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typedef struct Tunnel {
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NetDev meta;
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uint8_t encap_limit;
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int family;
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int ipv6_flowlabel;
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int allow_localremote;
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int gre_erspan_sequence;
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int isatap;
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unsigned ttl;
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unsigned tos;
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unsigned flags;
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uint32_t key;
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uint32_t ikey;
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uint32_t okey;
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uint8_t erspan_version;
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uint32_t erspan_index; /* version 1 */
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uint8_t erspan_direction; /* version 2 */
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uint16_t erspan_hwid; /* version 2 */
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NetDevLocalAddressType local_type;
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union in_addr_union local;
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union in_addr_union remote;
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Ip6TnlMode ip6tnl_mode;
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FooOverUDPEncapType fou_encap_type;
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int pmtudisc;
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bool ignore_df;
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bool copy_dscp;
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bool independent;
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bool fou_tunnel;
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bool assign_to_loopback;
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bool external; /* a.k.a collect metadata mode */
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uint16_t encap_src_port;
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uint16_t fou_destination_port;
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struct in6_addr sixrd_prefix;
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uint8_t sixrd_prefixlen;
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} Tunnel;
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int dhcp4_pd_create_6rd_tunnel_name(Link *link, char **ret);
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int dhcp4_pd_create_6rd_tunnel(Link *link, link_netlink_message_handler_t callback);
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DEFINE_NETDEV_CAST(IPIP, Tunnel);
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DEFINE_NETDEV_CAST(GRE, Tunnel);
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DEFINE_NETDEV_CAST(GRETAP, Tunnel);
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DEFINE_NETDEV_CAST(IP6GRE, Tunnel);
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DEFINE_NETDEV_CAST(IP6GRETAP, Tunnel);
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DEFINE_NETDEV_CAST(SIT, Tunnel);
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DEFINE_NETDEV_CAST(VTI, Tunnel);
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DEFINE_NETDEV_CAST(VTI6, Tunnel);
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DEFINE_NETDEV_CAST(IP6TNL, Tunnel);
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DEFINE_NETDEV_CAST(ERSPAN, Tunnel);
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static inline Tunnel* TUNNEL(NetDev *netdev) {
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assert(netdev);
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switch (netdev->kind) {
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case NETDEV_KIND_IPIP:
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return IPIP(netdev);
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case NETDEV_KIND_SIT:
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return SIT(netdev);
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case NETDEV_KIND_GRE:
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return GRE(netdev);
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case NETDEV_KIND_GRETAP:
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return GRETAP(netdev);
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case NETDEV_KIND_IP6GRE:
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return IP6GRE(netdev);
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case NETDEV_KIND_IP6GRETAP:
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return IP6GRETAP(netdev);
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case NETDEV_KIND_VTI:
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return VTI(netdev);
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case NETDEV_KIND_VTI6:
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return VTI6(netdev);
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case NETDEV_KIND_IP6TNL:
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return IP6TNL(netdev);
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case NETDEV_KIND_ERSPAN:
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return ERSPAN(netdev);
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default:
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return NULL;
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}
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}
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extern const NetDevVTable ipip_vtable;
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extern const NetDevVTable sit_vtable;
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extern const NetDevVTable vti_vtable;
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extern const NetDevVTable vti6_vtable;
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extern const NetDevVTable gre_vtable;
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extern const NetDevVTable gretap_vtable;
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extern const NetDevVTable ip6gre_vtable;
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extern const NetDevVTable ip6gretap_vtable;
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extern const NetDevVTable ip6tnl_vtable;
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extern const NetDevVTable erspan_vtable;
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const char *ip6tnl_mode_to_string(Ip6TnlMode d) _const_;
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Ip6TnlMode ip6tnl_mode_from_string(const char *d) _pure_;
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CONFIG_PARSER_PROTOTYPE(config_parse_ip6tnl_mode);
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CONFIG_PARSER_PROTOTYPE(config_parse_tunnel_local_address);
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CONFIG_PARSER_PROTOTYPE(config_parse_tunnel_remote_address);
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CONFIG_PARSER_PROTOTYPE(config_parse_ipv6_flowlabel);
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CONFIG_PARSER_PROTOTYPE(config_parse_encap_limit);
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CONFIG_PARSER_PROTOTYPE(config_parse_tunnel_key);
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CONFIG_PARSER_PROTOTYPE(config_parse_6rd_prefix);
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CONFIG_PARSER_PROTOTYPE(config_parse_erspan_version);
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CONFIG_PARSER_PROTOTYPE(config_parse_erspan_index);
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CONFIG_PARSER_PROTOTYPE(config_parse_erspan_direction);
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CONFIG_PARSER_PROTOTYPE(config_parse_erspan_hwid);
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