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// 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);
__type(key, int);
__type(value, __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";
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