1 // SPDX-License-Identifier: GPL-2.0 2 #include <stddef.h> 3 #include <string.h> 4 #include <netinet/in.h> 5 #include <linux/bpf.h> 6 #include <linux/if_ether.h> 7 #include <linux/if_packet.h> 8 #include <linux/ip.h> 9 #include <linux/ipv6.h> 10 #include <linux/types.h> 11 #include <linux/socket.h> 12 #include <linux/tcp.h> 13 #include <bpf/bpf_helpers.h> 14 #include <bpf/bpf_endian.h> 15 #include "test_tcpnotify.h" 16 17 struct { 18 __uint(type, BPF_MAP_TYPE_ARRAY); 19 __uint(max_entries, 4); 20 __type(key, __u32); 21 __type(value, struct tcpnotify_globals); 22 } global_map SEC(".maps"); 23 24 struct { 25 __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY); 26 __uint(max_entries, 2); 27 __uint(key_size, sizeof(int)); 28 __uint(value_size, sizeof(__u32)); 29 } perf_event_map SEC(".maps"); 30 31 int _version SEC("version") = 1; 32 33 SEC("sockops") 34 int bpf_testcb(struct bpf_sock_ops *skops) 35 { 36 int rv = -1; 37 int op; 38 39 op = (int) skops->op; 40 41 if (bpf_ntohl(skops->remote_port) != TESTPORT) { 42 skops->reply = -1; 43 return 0; 44 } 45 46 switch (op) { 47 case BPF_SOCK_OPS_TIMEOUT_INIT: 48 case BPF_SOCK_OPS_RWND_INIT: 49 case BPF_SOCK_OPS_NEEDS_ECN: 50 case BPF_SOCK_OPS_BASE_RTT: 51 case BPF_SOCK_OPS_RTO_CB: 52 rv = 1; 53 break; 54 55 case BPF_SOCK_OPS_TCP_CONNECT_CB: 56 case BPF_SOCK_OPS_TCP_LISTEN_CB: 57 case BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB: 58 case BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB: 59 bpf_sock_ops_cb_flags_set(skops, (BPF_SOCK_OPS_RETRANS_CB_FLAG| 60 BPF_SOCK_OPS_RTO_CB_FLAG)); 61 rv = 1; 62 break; 63 case BPF_SOCK_OPS_RETRANS_CB: { 64 __u32 key = 0; 65 struct tcpnotify_globals g, *gp; 66 struct tcp_notifier msg = { 67 .type = 0xde, 68 .subtype = 0xad, 69 .source = 0xbe, 70 .hash = 0xef, 71 }; 72 73 rv = 1; 74 75 /* Update results */ 76 gp = bpf_map_lookup_elem(&global_map, &key); 77 if (!gp) 78 break; 79 g = *gp; 80 g.total_retrans = skops->total_retrans; 81 g.ncalls++; 82 bpf_map_update_elem(&global_map, &key, &g, 83 BPF_ANY); 84 bpf_perf_event_output(skops, &perf_event_map, 85 BPF_F_CURRENT_CPU, 86 &msg, sizeof(msg)); 87 } 88 break; 89 default: 90 rv = -1; 91 } 92 skops->reply = rv; 93 return 1; 94 } 95 char _license[] SEC("license") = "GPL"; 96