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 __type(key, int); 28 __type(value, __u32); 29 } perf_event_map SEC(".maps"); 30 31 SEC("sockops") 32 int bpf_testcb(struct bpf_sock_ops *skops) 33 { 34 int rv = -1; 35 int op; 36 37 op = (int) skops->op; 38 39 if (bpf_ntohl(skops->remote_port) != TESTPORT) { 40 skops->reply = -1; 41 return 0; 42 } 43 44 switch (op) { 45 case BPF_SOCK_OPS_TIMEOUT_INIT: 46 case BPF_SOCK_OPS_RWND_INIT: 47 case BPF_SOCK_OPS_NEEDS_ECN: 48 case BPF_SOCK_OPS_BASE_RTT: 49 case BPF_SOCK_OPS_RTO_CB: 50 rv = 1; 51 break; 52 53 case BPF_SOCK_OPS_TCP_CONNECT_CB: 54 case BPF_SOCK_OPS_TCP_LISTEN_CB: 55 case BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB: 56 case BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB: 57 bpf_sock_ops_cb_flags_set(skops, (BPF_SOCK_OPS_RETRANS_CB_FLAG| 58 BPF_SOCK_OPS_RTO_CB_FLAG)); 59 rv = 1; 60 break; 61 case BPF_SOCK_OPS_RETRANS_CB: { 62 __u32 key = 0; 63 struct tcpnotify_globals g, *gp; 64 struct tcp_notifier msg = { 65 .type = 0xde, 66 .subtype = 0xad, 67 .source = 0xbe, 68 .hash = 0xef, 69 }; 70 71 rv = 1; 72 73 /* Update results */ 74 gp = bpf_map_lookup_elem(&global_map, &key); 75 if (!gp) 76 break; 77 g = *gp; 78 g.total_retrans = skops->total_retrans; 79 g.ncalls++; 80 bpf_map_update_elem(&global_map, &key, &g, 81 BPF_ANY); 82 bpf_perf_event_output(skops, &perf_event_map, 83 BPF_F_CURRENT_CPU, 84 &msg, sizeof(msg)); 85 } 86 break; 87 default: 88 rv = -1; 89 } 90 skops->reply = rv; 91 return 1; 92 } 93 char _license[] SEC("license") = "GPL"; 94