William Tu | 6afb1e2 | 2016-08-19 11:55:44 -0700 | [diff] [blame] | 1 | /* Copyright (c) 2016 VMware |
Alexei Starovoitov | a1c8270 | 2016-09-15 13:00:31 -0700 | [diff] [blame] | 2 | * Copyright (c) 2016 Facebook |
William Tu | 6afb1e2 | 2016-08-19 11:55:44 -0700 | [diff] [blame] | 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of version 2 of the GNU General Public |
| 6 | * License as published by the Free Software Foundation. |
| 7 | */ |
| 8 | #include <uapi/linux/bpf.h> |
| 9 | #include <uapi/linux/if_ether.h> |
| 10 | #include <uapi/linux/if_packet.h> |
| 11 | #include <uapi/linux/ip.h> |
Alexei Starovoitov | 173ca26 | 2016-09-15 13:00:32 -0700 | [diff] [blame] | 12 | #include <uapi/linux/ipv6.h> |
William Tu | 6afb1e2 | 2016-08-19 11:55:44 -0700 | [diff] [blame] | 13 | #include <uapi/linux/in.h> |
| 14 | #include <uapi/linux/tcp.h> |
| 15 | #include <uapi/linux/filter.h> |
| 16 | #include <uapi/linux/pkt_cls.h> |
Alexei Starovoitov | 173ca26 | 2016-09-15 13:00:32 -0700 | [diff] [blame] | 17 | #include <net/ipv6.h> |
William Tu | 6afb1e2 | 2016-08-19 11:55:44 -0700 | [diff] [blame] | 18 | #include "bpf_helpers.h" |
| 19 | |
Alexei Starovoitov | 173ca26 | 2016-09-15 13:00:32 -0700 | [diff] [blame] | 20 | #define _htonl __builtin_bswap32 |
William Tu | 6afb1e2 | 2016-08-19 11:55:44 -0700 | [diff] [blame] | 21 | #define ERROR(ret) do {\ |
| 22 | char fmt[] = "ERROR line:%d ret:%d\n";\ |
| 23 | bpf_trace_printk(fmt, sizeof(fmt), __LINE__, ret); \ |
| 24 | } while(0) |
| 25 | |
| 26 | struct geneve_opt { |
| 27 | __be16 opt_class; |
| 28 | u8 type; |
| 29 | u8 length:5; |
| 30 | u8 r3:1; |
| 31 | u8 r2:1; |
| 32 | u8 r1:1; |
| 33 | u8 opt_data[8]; /* hard-coded to 8 byte */ |
| 34 | }; |
| 35 | |
| 36 | struct vxlan_metadata { |
| 37 | u32 gbp; |
| 38 | }; |
| 39 | |
| 40 | SEC("gre_set_tunnel") |
| 41 | int _gre_set_tunnel(struct __sk_buff *skb) |
| 42 | { |
| 43 | int ret; |
| 44 | struct bpf_tunnel_key key; |
| 45 | |
| 46 | __builtin_memset(&key, 0x0, sizeof(key)); |
| 47 | key.remote_ipv4 = 0xac100164; /* 172.16.1.100 */ |
| 48 | key.tunnel_id = 2; |
| 49 | key.tunnel_tos = 0; |
| 50 | key.tunnel_ttl = 64; |
| 51 | |
| 52 | ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key), BPF_F_ZERO_CSUM_TX); |
| 53 | if (ret < 0) { |
| 54 | ERROR(ret); |
| 55 | return TC_ACT_SHOT; |
| 56 | } |
| 57 | |
| 58 | return TC_ACT_OK; |
| 59 | } |
| 60 | |
| 61 | SEC("gre_get_tunnel") |
| 62 | int _gre_get_tunnel(struct __sk_buff *skb) |
| 63 | { |
| 64 | int ret; |
| 65 | struct bpf_tunnel_key key; |
| 66 | char fmt[] = "key %d remote ip 0x%x\n"; |
| 67 | |
| 68 | ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key), 0); |
| 69 | if (ret < 0) { |
| 70 | ERROR(ret); |
| 71 | return TC_ACT_SHOT; |
| 72 | } |
| 73 | |
| 74 | bpf_trace_printk(fmt, sizeof(fmt), key.tunnel_id, key.remote_ipv4); |
| 75 | return TC_ACT_OK; |
| 76 | } |
| 77 | |
| 78 | SEC("vxlan_set_tunnel") |
| 79 | int _vxlan_set_tunnel(struct __sk_buff *skb) |
| 80 | { |
| 81 | int ret; |
| 82 | struct bpf_tunnel_key key; |
| 83 | struct vxlan_metadata md; |
| 84 | |
| 85 | __builtin_memset(&key, 0x0, sizeof(key)); |
| 86 | key.remote_ipv4 = 0xac100164; /* 172.16.1.100 */ |
| 87 | key.tunnel_id = 2; |
| 88 | key.tunnel_tos = 0; |
| 89 | key.tunnel_ttl = 64; |
| 90 | |
| 91 | ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key), BPF_F_ZERO_CSUM_TX); |
| 92 | if (ret < 0) { |
| 93 | ERROR(ret); |
| 94 | return TC_ACT_SHOT; |
| 95 | } |
| 96 | |
| 97 | md.gbp = 0x800FF; /* Set VXLAN Group Policy extension */ |
| 98 | ret = bpf_skb_set_tunnel_opt(skb, &md, sizeof(md)); |
| 99 | if (ret < 0) { |
| 100 | ERROR(ret); |
| 101 | return TC_ACT_SHOT; |
| 102 | } |
| 103 | |
| 104 | return TC_ACT_OK; |
| 105 | } |
| 106 | |
| 107 | SEC("vxlan_get_tunnel") |
| 108 | int _vxlan_get_tunnel(struct __sk_buff *skb) |
| 109 | { |
| 110 | int ret; |
| 111 | struct bpf_tunnel_key key; |
| 112 | struct vxlan_metadata md; |
| 113 | char fmt[] = "key %d remote ip 0x%x vxlan gbp 0x%x\n"; |
| 114 | |
| 115 | ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key), 0); |
| 116 | if (ret < 0) { |
| 117 | ERROR(ret); |
| 118 | return TC_ACT_SHOT; |
| 119 | } |
| 120 | |
| 121 | ret = bpf_skb_get_tunnel_opt(skb, &md, sizeof(md)); |
| 122 | if (ret < 0) { |
| 123 | ERROR(ret); |
| 124 | return TC_ACT_SHOT; |
| 125 | } |
| 126 | |
| 127 | bpf_trace_printk(fmt, sizeof(fmt), |
| 128 | key.tunnel_id, key.remote_ipv4, md.gbp); |
| 129 | |
| 130 | return TC_ACT_OK; |
| 131 | } |
| 132 | |
| 133 | SEC("geneve_set_tunnel") |
| 134 | int _geneve_set_tunnel(struct __sk_buff *skb) |
| 135 | { |
| 136 | int ret, ret2; |
| 137 | struct bpf_tunnel_key key; |
| 138 | struct geneve_opt gopt; |
| 139 | |
| 140 | __builtin_memset(&key, 0x0, sizeof(key)); |
| 141 | key.remote_ipv4 = 0xac100164; /* 172.16.1.100 */ |
| 142 | key.tunnel_id = 2; |
| 143 | key.tunnel_tos = 0; |
| 144 | key.tunnel_ttl = 64; |
| 145 | |
| 146 | __builtin_memset(&gopt, 0x0, sizeof(gopt)); |
| 147 | gopt.opt_class = 0x102; /* Open Virtual Networking (OVN) */ |
| 148 | gopt.type = 0x08; |
| 149 | gopt.r1 = 1; |
| 150 | gopt.r2 = 0; |
| 151 | gopt.r3 = 1; |
| 152 | gopt.length = 2; /* 4-byte multiple */ |
| 153 | *(int *) &gopt.opt_data = 0xdeadbeef; |
| 154 | |
| 155 | ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key), BPF_F_ZERO_CSUM_TX); |
| 156 | if (ret < 0) { |
| 157 | ERROR(ret); |
| 158 | return TC_ACT_SHOT; |
| 159 | } |
| 160 | |
| 161 | ret = bpf_skb_set_tunnel_opt(skb, &gopt, sizeof(gopt)); |
| 162 | if (ret < 0) { |
| 163 | ERROR(ret); |
| 164 | return TC_ACT_SHOT; |
| 165 | } |
| 166 | |
| 167 | return TC_ACT_OK; |
| 168 | } |
| 169 | |
| 170 | SEC("geneve_get_tunnel") |
| 171 | int _geneve_get_tunnel(struct __sk_buff *skb) |
| 172 | { |
| 173 | int ret; |
| 174 | struct bpf_tunnel_key key; |
| 175 | struct geneve_opt gopt; |
| 176 | char fmt[] = "key %d remote ip 0x%x geneve class 0x%x\n"; |
| 177 | |
| 178 | ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key), 0); |
| 179 | if (ret < 0) { |
| 180 | ERROR(ret); |
| 181 | return TC_ACT_SHOT; |
| 182 | } |
| 183 | |
| 184 | ret = bpf_skb_get_tunnel_opt(skb, &gopt, sizeof(gopt)); |
| 185 | if (ret < 0) { |
| 186 | ERROR(ret); |
| 187 | return TC_ACT_SHOT; |
| 188 | } |
| 189 | |
| 190 | bpf_trace_printk(fmt, sizeof(fmt), |
| 191 | key.tunnel_id, key.remote_ipv4, gopt.opt_class); |
| 192 | return TC_ACT_OK; |
| 193 | } |
| 194 | |
Alexei Starovoitov | a1c8270 | 2016-09-15 13:00:31 -0700 | [diff] [blame] | 195 | SEC("ipip_set_tunnel") |
| 196 | int _ipip_set_tunnel(struct __sk_buff *skb) |
| 197 | { |
| 198 | struct bpf_tunnel_key key = {}; |
| 199 | void *data = (void *)(long)skb->data; |
| 200 | struct iphdr *iph = data; |
| 201 | struct tcphdr *tcp = data + sizeof(*iph); |
| 202 | void *data_end = (void *)(long)skb->data_end; |
| 203 | int ret; |
| 204 | |
| 205 | /* single length check */ |
| 206 | if (data + sizeof(*iph) + sizeof(*tcp) > data_end) { |
| 207 | ERROR(1); |
| 208 | return TC_ACT_SHOT; |
| 209 | } |
| 210 | |
| 211 | key.tunnel_ttl = 64; |
| 212 | if (iph->protocol == IPPROTO_ICMP) { |
| 213 | key.remote_ipv4 = 0xac100164; /* 172.16.1.100 */ |
| 214 | } else { |
| 215 | if (iph->protocol != IPPROTO_TCP || iph->ihl != 5) |
| 216 | return TC_ACT_SHOT; |
| 217 | |
| 218 | if (tcp->dest == htons(5200)) |
| 219 | key.remote_ipv4 = 0xac100164; /* 172.16.1.100 */ |
| 220 | else if (tcp->dest == htons(5201)) |
| 221 | key.remote_ipv4 = 0xac100165; /* 172.16.1.101 */ |
| 222 | else |
| 223 | return TC_ACT_SHOT; |
| 224 | } |
| 225 | |
| 226 | ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key), 0); |
| 227 | if (ret < 0) { |
| 228 | ERROR(ret); |
| 229 | return TC_ACT_SHOT; |
| 230 | } |
| 231 | |
| 232 | return TC_ACT_OK; |
| 233 | } |
| 234 | |
| 235 | SEC("ipip_get_tunnel") |
| 236 | int _ipip_get_tunnel(struct __sk_buff *skb) |
| 237 | { |
| 238 | int ret; |
| 239 | struct bpf_tunnel_key key; |
| 240 | char fmt[] = "remote ip 0x%x\n"; |
| 241 | |
| 242 | ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key), 0); |
| 243 | if (ret < 0) { |
| 244 | ERROR(ret); |
| 245 | return TC_ACT_SHOT; |
| 246 | } |
| 247 | |
| 248 | bpf_trace_printk(fmt, sizeof(fmt), key.remote_ipv4); |
| 249 | return TC_ACT_OK; |
| 250 | } |
| 251 | |
Alexei Starovoitov | 173ca26 | 2016-09-15 13:00:32 -0700 | [diff] [blame] | 252 | SEC("ipip6_set_tunnel") |
| 253 | int _ipip6_set_tunnel(struct __sk_buff *skb) |
| 254 | { |
| 255 | struct bpf_tunnel_key key = {}; |
| 256 | void *data = (void *)(long)skb->data; |
| 257 | struct iphdr *iph = data; |
| 258 | struct tcphdr *tcp = data + sizeof(*iph); |
| 259 | void *data_end = (void *)(long)skb->data_end; |
| 260 | int ret; |
| 261 | |
| 262 | /* single length check */ |
| 263 | if (data + sizeof(*iph) + sizeof(*tcp) > data_end) { |
| 264 | ERROR(1); |
| 265 | return TC_ACT_SHOT; |
| 266 | } |
| 267 | |
| 268 | key.remote_ipv6[0] = _htonl(0x2401db00); |
| 269 | key.tunnel_ttl = 64; |
| 270 | |
| 271 | if (iph->protocol == IPPROTO_ICMP) { |
| 272 | key.remote_ipv6[3] = _htonl(1); |
| 273 | } else { |
| 274 | if (iph->protocol != IPPROTO_TCP || iph->ihl != 5) { |
| 275 | ERROR(iph->protocol); |
| 276 | return TC_ACT_SHOT; |
| 277 | } |
| 278 | |
| 279 | if (tcp->dest == htons(5200)) { |
| 280 | key.remote_ipv6[3] = _htonl(1); |
| 281 | } else if (tcp->dest == htons(5201)) { |
| 282 | key.remote_ipv6[3] = _htonl(2); |
| 283 | } else { |
| 284 | ERROR(tcp->dest); |
| 285 | return TC_ACT_SHOT; |
| 286 | } |
| 287 | } |
| 288 | |
| 289 | ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key), BPF_F_TUNINFO_IPV6); |
| 290 | if (ret < 0) { |
| 291 | ERROR(ret); |
| 292 | return TC_ACT_SHOT; |
| 293 | } |
| 294 | |
| 295 | return TC_ACT_OK; |
| 296 | } |
| 297 | |
| 298 | SEC("ipip6_get_tunnel") |
| 299 | int _ipip6_get_tunnel(struct __sk_buff *skb) |
| 300 | { |
| 301 | int ret; |
| 302 | struct bpf_tunnel_key key; |
| 303 | char fmt[] = "remote ip6 %x::%x\n"; |
| 304 | |
| 305 | ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key), BPF_F_TUNINFO_IPV6); |
| 306 | if (ret < 0) { |
| 307 | ERROR(ret); |
| 308 | return TC_ACT_SHOT; |
| 309 | } |
| 310 | |
| 311 | bpf_trace_printk(fmt, sizeof(fmt), _htonl(key.remote_ipv6[0]), |
| 312 | _htonl(key.remote_ipv6[3])); |
| 313 | return TC_ACT_OK; |
| 314 | } |
| 315 | |
| 316 | SEC("ip6ip6_set_tunnel") |
| 317 | int _ip6ip6_set_tunnel(struct __sk_buff *skb) |
| 318 | { |
| 319 | struct bpf_tunnel_key key = {}; |
| 320 | void *data = (void *)(long)skb->data; |
| 321 | struct ipv6hdr *iph = data; |
| 322 | struct tcphdr *tcp = data + sizeof(*iph); |
| 323 | void *data_end = (void *)(long)skb->data_end; |
| 324 | int ret; |
| 325 | |
| 326 | /* single length check */ |
| 327 | if (data + sizeof(*iph) + sizeof(*tcp) > data_end) { |
| 328 | ERROR(1); |
| 329 | return TC_ACT_SHOT; |
| 330 | } |
| 331 | |
| 332 | key.remote_ipv6[0] = _htonl(0x2401db00); |
| 333 | key.tunnel_ttl = 64; |
| 334 | |
| 335 | if (iph->nexthdr == NEXTHDR_ICMP) { |
| 336 | key.remote_ipv6[3] = _htonl(1); |
| 337 | } else { |
| 338 | if (iph->nexthdr != NEXTHDR_TCP) { |
| 339 | ERROR(iph->nexthdr); |
| 340 | return TC_ACT_SHOT; |
| 341 | } |
| 342 | |
| 343 | if (tcp->dest == htons(5200)) { |
| 344 | key.remote_ipv6[3] = _htonl(1); |
| 345 | } else if (tcp->dest == htons(5201)) { |
| 346 | key.remote_ipv6[3] = _htonl(2); |
| 347 | } else { |
| 348 | ERROR(tcp->dest); |
| 349 | return TC_ACT_SHOT; |
| 350 | } |
| 351 | } |
| 352 | |
| 353 | ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key), BPF_F_TUNINFO_IPV6); |
| 354 | if (ret < 0) { |
| 355 | ERROR(ret); |
| 356 | return TC_ACT_SHOT; |
| 357 | } |
| 358 | |
| 359 | return TC_ACT_OK; |
| 360 | } |
| 361 | |
| 362 | SEC("ip6ip6_get_tunnel") |
| 363 | int _ip6ip6_get_tunnel(struct __sk_buff *skb) |
| 364 | { |
| 365 | int ret; |
| 366 | struct bpf_tunnel_key key; |
| 367 | char fmt[] = "remote ip6 %x::%x\n"; |
| 368 | |
| 369 | ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key), BPF_F_TUNINFO_IPV6); |
| 370 | if (ret < 0) { |
| 371 | ERROR(ret); |
| 372 | return TC_ACT_SHOT; |
| 373 | } |
| 374 | |
| 375 | bpf_trace_printk(fmt, sizeof(fmt), _htonl(key.remote_ipv6[0]), |
| 376 | _htonl(key.remote_ipv6[3])); |
| 377 | return TC_ACT_OK; |
| 378 | } |
| 379 | |
| 380 | |
William Tu | 6afb1e2 | 2016-08-19 11:55:44 -0700 | [diff] [blame] | 381 | char _license[] SEC("license") = "GPL"; |