Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 | // 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_tcpbpf.h" struct { __uint(type, BPF_MAP_TYPE_ARRAY); __uint(max_entries, 4); __type(key, __u32); __type(value, struct tcpbpf_globals); } global_map SEC(".maps"); struct { __uint(type, BPF_MAP_TYPE_ARRAY); __uint(max_entries, 2); __type(key, __u32); __type(value, int); } sockopt_results SEC(".maps"); static inline void update_event_map(int event) { __u32 key = 0; struct tcpbpf_globals g, *gp; gp = bpf_map_lookup_elem(&global_map, &key); if (gp == NULL) { struct tcpbpf_globals g = {0}; g.event_map |= (1 << event); bpf_map_update_elem(&global_map, &key, &g, BPF_ANY); } else { g = *gp; g.event_map |= (1 << event); bpf_map_update_elem(&global_map, &key, &g, BPF_ANY); } } int _version SEC("version") = 1; SEC("sockops") int bpf_testcb(struct bpf_sock_ops *skops) { char header[sizeof(struct ipv6hdr) + sizeof(struct tcphdr)]; struct tcphdr *thdr; int good_call_rv = 0; int bad_call_rv = 0; int save_syn = 1; int rv = -1; int v = 0; int op; op = (int) skops->op; update_event_map(op); switch (op) { case BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB: /* Test failure to set largest cb flag (assumes not defined) */ bad_call_rv = bpf_sock_ops_cb_flags_set(skops, 0x80); /* Set callback */ good_call_rv = bpf_sock_ops_cb_flags_set(skops, BPF_SOCK_OPS_STATE_CB_FLAG); /* Update results */ { __u32 key = 0; struct tcpbpf_globals g, *gp; gp = bpf_map_lookup_elem(&global_map, &key); if (!gp) break; g = *gp; g.bad_cb_test_rv = bad_call_rv; g.good_cb_test_rv = good_call_rv; bpf_map_update_elem(&global_map, &key, &g, BPF_ANY); } break; case BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB: skops->sk_txhash = 0x12345f; v = 0xff; rv = bpf_setsockopt(skops, SOL_IPV6, IPV6_TCLASS, &v, sizeof(v)); if (skops->family == AF_INET6) { v = bpf_getsockopt(skops, IPPROTO_TCP, TCP_SAVED_SYN, header, (sizeof(struct ipv6hdr) + sizeof(struct tcphdr))); if (!v) { int offset = sizeof(struct ipv6hdr); thdr = (struct tcphdr *)(header + offset); v = thdr->syn; __u32 key = 1; bpf_map_update_elem(&sockopt_results, &key, &v, BPF_ANY); } } break; case BPF_SOCK_OPS_RTO_CB: break; case BPF_SOCK_OPS_RETRANS_CB: break; case BPF_SOCK_OPS_STATE_CB: if (skops->args[1] == BPF_TCP_CLOSE) { __u32 key = 0; struct tcpbpf_globals g, *gp; gp = bpf_map_lookup_elem(&global_map, &key); if (!gp) break; g = *gp; if (skops->args[0] == BPF_TCP_LISTEN) { g.num_listen++; } else { g.total_retrans = skops->total_retrans; g.data_segs_in = skops->data_segs_in; g.data_segs_out = skops->data_segs_out; g.bytes_received = skops->bytes_received; g.bytes_acked = skops->bytes_acked; } g.num_close_events++; bpf_map_update_elem(&global_map, &key, &g, BPF_ANY); } break; case BPF_SOCK_OPS_TCP_LISTEN_CB: bpf_sock_ops_cb_flags_set(skops, BPF_SOCK_OPS_STATE_CB_FLAG); v = bpf_setsockopt(skops, IPPROTO_TCP, TCP_SAVE_SYN, &save_syn, sizeof(save_syn)); /* Update global map w/ result of setsock opt */ __u32 key = 0; bpf_map_update_elem(&sockopt_results, &key, &v, BPF_ANY); break; default: rv = -1; } skops->reply = rv; return 1; } char _license[] SEC("license") = "GPL"; |