Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0
#include <stddef.h>
#include <string.h>
#include <netinet/in.h>
#include <linux/bpf.h>
#include <linux/if_ether.h>
#include <linux/if_packet.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/tcp.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_endian.h>
#include "test_tcpnotify.h"
 
struct {
<------>__uint(type, BPF_MAP_TYPE_ARRAY);
<------>__uint(max_entries, 4);
<------>__type(key, __u32);
<------>__type(value, struct tcpnotify_globals);
} global_map SEC(".maps");
 
struct {
<------>__uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
<------>__uint(max_entries, 2);
<------>__uint(key_size, sizeof(int));
<------>__uint(value_size, sizeof(__u32));
} perf_event_map SEC(".maps");
 
int _version SEC("version") = 1;
 
SEC("sockops")
int bpf_testcb(struct bpf_sock_ops *skops)
{
<------>int rv = -1;
<------>int op;
 
<------>op = (int) skops->op;
 
<------>if (bpf_ntohl(skops->remote_port) != TESTPORT) {
<------><------>skops->reply = -1;
<------><------>return 0;
<------>}
 
<------>switch (op) {
<------>case BPF_SOCK_OPS_TIMEOUT_INIT:
<------>case BPF_SOCK_OPS_RWND_INIT:
<------>case BPF_SOCK_OPS_NEEDS_ECN:
<------>case BPF_SOCK_OPS_BASE_RTT:
<------>case BPF_SOCK_OPS_RTO_CB:
<------><------>rv = 1;
<------><------>break;
 
<------>case BPF_SOCK_OPS_TCP_CONNECT_CB:
<------>case BPF_SOCK_OPS_TCP_LISTEN_CB:
<------>case BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB:
<------>case BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB:
<------><------>bpf_sock_ops_cb_flags_set(skops, (BPF_SOCK_OPS_RETRANS_CB_FLAG|
<------><------><------><------><------>  BPF_SOCK_OPS_RTO_CB_FLAG));
<------><------>rv = 1;
<------><------>break;
<------>case BPF_SOCK_OPS_RETRANS_CB: {
<------><------><------>__u32 key = 0;
<------><------><------>struct tcpnotify_globals g, *gp;
<------><------><------>struct tcp_notifier msg = {
<------><------><------><------>.type = 0xde,
<------><------><------><------>.subtype = 0xad,
<------><------><------><------>.source = 0xbe,
<------><------><------><------>.hash = 0xef,
<------><------><------>};
 
<------><------><------>rv = 1;
 
<------><------><------>/* Update results */
<------><------><------>gp = bpf_map_lookup_elem(&global_map, &key);
<------><------><------>if (!gp)
<------><------><------><------>break;
<------><------><------>g = *gp;
<------><------><------>g.total_retrans = skops->total_retrans;
<------><------><------>g.ncalls++;
<------><------><------>bpf_map_update_elem(&global_map, &key, &g,
<------><------><------><------><------>    BPF_ANY);
<------><------><------>bpf_perf_event_output(skops, &perf_event_map,
<------><------><------><------><------>      BPF_F_CURRENT_CPU,
<------><------><------><------><------>      &msg, sizeof(msg));
<------><------>}
<------><------>break;
<------>default:
<------><------>rv = -1;
<------>}
<------>skops->reply = rv;
<------>return 1;
}
char _license[] SEC("license") = "GPL";