fixup: manually add C files that 'go mod' doesn't bring in

Need workaround until a fix upstream such as
https://github.com/iovisor/gobpf/pull/206/files is merged.

vendor/github.com/iovisor/gobpf/elf/include/bpf_map.h

@@ -0,0 +1,18 @@
+#define BUF_SIZE_MAP_NS 256
+
+typedef struct bpf_map_def {
+	unsigned int type;
+	unsigned int key_size;
+	unsigned int value_size;
+	unsigned int max_entries;
+	unsigned int map_flags;
+	unsigned int pinning;
+	char namespace[BUF_SIZE_MAP_NS];
+} bpf_map_def;
+
+enum bpf_pin_type {
+	PIN_NONE = 0,
+	PIN_OBJECT_NS,
+	PIN_GLOBAL_NS,
+	PIN_CUSTOM_NS,
+};

vendor/github.com/weaveworks/tcptracer-bpf/tcptracer-bpf.h

@@ -0,0 +1,114 @@
+#ifndef __TCPTRACER_BPF_H
+#define __TCPTRACER_BPF_H
+
+#include <linux/types.h>
+
+#define TCP_EVENT_TYPE_CONNECT          1
+#define TCP_EVENT_TYPE_ACCEPT           2
+#define TCP_EVENT_TYPE_CLOSE            3
+#define TCP_EVENT_TYPE_FD_INSTALL       4
+
+#define GUESS_SADDR      0
+#define GUESS_DADDR      1
+#define GUESS_FAMILY     2
+#define GUESS_SPORT      3
+#define GUESS_DPORT      4
+#define GUESS_NETNS      5
+#define GUESS_DADDR_IPV6 6
+
+#ifndef TASK_COMM_LEN
+#define TASK_COMM_LEN 16
+#endif
+
+struct tcp_ipv4_event_t {
+	__u64 timestamp;
+	__u64 cpu;
+	__u32 type;
+	__u32 pid;
+	char comm[TASK_COMM_LEN];
+	__u32 saddr;
+	__u32 daddr;
+	__u16 sport;
+	__u16 dport;
+	__u32 netns;
+	__u32 fd;
+	__u32 dummy;
+};
+
+struct tcp_ipv6_event_t {
+	__u64 timestamp;
+	__u64 cpu;
+	__u32 type;
+	__u32 pid;
+	char comm[TASK_COMM_LEN];
+	/* Using the type unsigned __int128 generates an error in the ebpf verifier */
+	__u64 saddr_h;
+	__u64 saddr_l;
+	__u64 daddr_h;
+	__u64 daddr_l;
+	__u16 sport;
+	__u16 dport;
+	__u32 netns;
+	__u32 fd;
+	__u32 dummy;
+};
+
+// tcp_set_state doesn't run in the context of the process that initiated the
+// connection so we need to store a map TUPLE -> PID to send the right PID on
+// the event
+struct ipv4_tuple_t {
+	__u32 saddr;
+	__u32 daddr;
+	__u16 sport;
+	__u16 dport;
+	__u32 netns;
+};
+
+struct ipv6_tuple_t {
+	/* Using the type unsigned __int128 generates an error in the ebpf verifier */
+	__u64 saddr_h;
+	__u64 saddr_l;
+	__u64 daddr_h;
+	__u64 daddr_l;
+	__u16 sport;
+	__u16 dport;
+	__u32 netns;
+};
+
+struct pid_comm_t {
+	__u64 pid;
+	char comm[TASK_COMM_LEN];
+};
+
+#define TCPTRACER_STATE_UNINITIALIZED 0
+#define TCPTRACER_STATE_CHECKING      1
+#define TCPTRACER_STATE_CHECKED       2
+#define TCPTRACER_STATE_READY         3
+struct tcptracer_status_t {
+	__u64 state;
+
+	/* checking */
+	__u64 pid_tgid;
+	__u64 what;
+	__u64 offset_saddr;
+	__u64 offset_daddr;
+	__u64 offset_sport;
+	__u64 offset_dport;
+	__u64 offset_netns;
+	__u64 offset_ino;
+	__u64 offset_family;
+	__u64 offset_daddr_ipv6;
+
+	__u64 err;
+
+	__u32 daddr_ipv6[4];
+	__u32 netns;
+	__u32 saddr;
+	__u32 daddr;
+	__u16 sport;
+	__u16 dport;
+	__u16 family;
+	__u16 padding;
+};
+
+#endif