/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
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/* Copyright 2019, 2020 Cloudflare */
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <string.h>
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#include <linux/if_ether.h>
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#include <linux/in.h>
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include <linux/udp.h>
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/* offsetof() is used in static asserts, and the libbpf-redefined CO-RE
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* friendly version breaks compilation for older clang versions <= 15
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* when invoked in a static assert. Restore original here.
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*/
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#ifdef offsetof
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#undef offsetof
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#define offsetof(type, member) __builtin_offsetof(type, member)
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#endif
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struct gre_base_hdr {
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uint16_t flags;
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uint16_t protocol;
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} __attribute__((packed));
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struct guehdr {
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#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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uint8_t hlen : 5, control : 1, variant : 2;
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#else
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uint8_t variant : 2, control : 1, hlen : 5;
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#endif
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uint8_t proto_ctype;
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uint16_t flags;
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};
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struct unigue {
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#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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uint8_t _r : 2, last_hop_gre : 1, forward_syn : 1, version : 4;
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#else
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uint8_t version : 4, forward_syn : 1, last_hop_gre : 1, _r : 2;
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#endif
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uint8_t reserved;
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uint8_t next_hop;
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uint8_t hop_count;
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// Next hops go here
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} __attribute__((packed));
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typedef struct {
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struct ethhdr eth;
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struct iphdr ip;
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struct gre_base_hdr gre;
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} __attribute__((packed)) encap_gre_t;
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typedef struct {
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struct ethhdr eth;
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struct iphdr ip;
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struct udphdr udp;
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struct guehdr gue;
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struct unigue unigue;
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} __attribute__((packed)) encap_headers_t;
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