1// SPDX-License-Identifier: GPL-2.0 2// Copyright (c) 2017 Facebook 3#include <stddef.h> 4#include <stdbool.h> 5#include <string.h> 6#include <linux/pkt_cls.h> 7#include <linux/bpf.h> 8#include <linux/in.h> 9#include <linux/if_ether.h> 10#include <linux/ip.h> 11#include <linux/ipv6.h> 12#include <linux/icmp.h> 13#include <linux/icmpv6.h> 14#include <linux/tcp.h> 15#include <linux/udp.h> 16#include <bpf/bpf_helpers.h> 17#include <bpf/bpf_endian.h> 18#include "bpf_compiler.h" 19 20static __always_inline __u32 rol32(__u32 word, unsigned int shift) 21{ 22 return (word << shift) | (word >> ((-shift) & 31)); 23} 24 25/* copy paste of jhash from kernel sources to make sure llvm 26 * can compile it into valid sequence of bpf instructions 27 */ 28#define __jhash_mix(a, b, c) \ 29{ \ 30 a -= c; a ^= rol32(c, 4); c += b; \ 31 b -= a; b ^= rol32(a, 6); a += c; \ 32 c -= b; c ^= rol32(b, 8); b += a; \ 33 a -= c; a ^= rol32(c, 16); c += b; \ 34 b -= a; b ^= rol32(a, 19); a += c; \ 35 c -= b; c ^= rol32(b, 4); b += a; \ 36} 37 38#define __jhash_final(a, b, c) \ 39{ \ 40 c ^= b; c -= rol32(b, 14); \ 41 a ^= c; a -= rol32(c, 11); \ 42 b ^= a; b -= rol32(a, 25); \ 43 c ^= b; c -= rol32(b, 16); \ 44 a ^= c; a -= rol32(c, 4); \ 45 b ^= a; b -= rol32(a, 14); \ 46 c ^= b; c -= rol32(b, 24); \ 47} 48 49#define JHASH_INITVAL 0xdeadbeef 50 51typedef unsigned int u32; 52 53static __noinline 54u32 jhash(const void *key, u32 length, u32 initval) 55{ 56 u32 a, b, c; 57 const unsigned char *k = key; 58 59 a = b = c = JHASH_INITVAL + length + initval; 60 61 while (length > 12) { 62 a += *(u32 *)(k); 63 b += *(u32 *)(k + 4); 64 c += *(u32 *)(k + 8); 65 __jhash_mix(a, b, c); 66 length -= 12; 67 k += 12; 68 } 69 switch (length) { 70 case 12: c += (u32)k[11]<<24; 71 case 11: c += (u32)k[10]<<16; 72 case 10: c += (u32)k[9]<<8; 73 case 9: c += k[8]; 74 case 8: b += (u32)k[7]<<24; 75 case 7: b += (u32)k[6]<<16; 76 case 6: b += (u32)k[5]<<8; 77 case 5: b += k[4]; 78 case 4: a += (u32)k[3]<<24; 79 case 3: a += (u32)k[2]<<16; 80 case 2: a += (u32)k[1]<<8; 81 case 1: a += k[0]; 82 __jhash_final(a, b, c); 83 case 0: /* Nothing left to add */ 84 break; 85 } 86 87 return c; 88} 89 90__noinline 91u32 __jhash_nwords(u32 a, u32 b, u32 c, u32 initval) 92{ 93 a += initval; 94 b += initval; 95 c += initval; 96 __jhash_final(a, b, c); 97 return c; 98} 99 100__noinline 101u32 jhash_2words(u32 a, u32 b, u32 initval) 102{ 103 return __jhash_nwords(a, b, 0, initval + JHASH_INITVAL + (2 << 2)); 104} 105 106struct flow_key { 107 union { 108 __be32 src; 109 __be32 srcv6[4]; 110 }; 111 union { 112 __be32 dst; 113 __be32 dstv6[4]; 114 }; 115 union { 116 __u32 ports; 117 __u16 port16[2]; 118 }; 119 __u8 proto; 120}; 121 122struct packet_description { 123 struct flow_key flow; 124 __u8 flags; 125}; 126 127struct ctl_value { 128 union { 129 __u64 value; 130 __u32 ifindex; 131 __u8 mac[6]; 132 }; 133}; 134 135struct vip_definition { 136 union { 137 __be32 vip; 138 __be32 vipv6[4]; 139 }; 140 __u16 port; 141 __u16 family; 142 __u8 proto; 143}; 144 145struct vip_meta { 146 __u32 flags; 147 __u32 vip_num; 148}; 149 150struct real_pos_lru { 151 __u32 pos; 152 __u64 atime; 153}; 154 155struct real_definition { 156 union { 157 __be32 dst; 158 __be32 dstv6[4]; 159 }; 160 __u8 flags; 161}; 162 163struct lb_stats { 164 __u64 v2; 165 __u64 v1; 166}; 167 168struct { 169 __uint(type, BPF_MAP_TYPE_HASH); 170 __uint(max_entries, 512); 171 __type(key, struct vip_definition); 172 __type(value, struct vip_meta); 173} vip_map SEC(".maps"); 174 175struct { 176 __uint(type, BPF_MAP_TYPE_LRU_HASH); 177 __uint(max_entries, 300); 178 __uint(map_flags, 1U << 1); 179 __type(key, struct flow_key); 180 __type(value, struct real_pos_lru); 181} lru_cache SEC(".maps"); 182 183struct { 184 __uint(type, BPF_MAP_TYPE_ARRAY); 185 __uint(max_entries, 12 * 655); 186 __type(key, __u32); 187 __type(value, __u32); 188} ch_rings SEC(".maps"); 189 190struct { 191 __uint(type, BPF_MAP_TYPE_ARRAY); 192 __uint(max_entries, 40); 193 __type(key, __u32); 194 __type(value, struct real_definition); 195} reals SEC(".maps"); 196 197struct { 198 __uint(type, BPF_MAP_TYPE_PERCPU_ARRAY); 199 __uint(max_entries, 515); 200 __type(key, __u32); 201 __type(value, struct lb_stats); 202} stats SEC(".maps"); 203 204struct { 205 __uint(type, BPF_MAP_TYPE_ARRAY); 206 __uint(max_entries, 16); 207 __type(key, __u32); 208 __type(value, struct ctl_value); 209} ctl_array SEC(".maps"); 210 211struct eth_hdr { 212 unsigned char eth_dest[6]; 213 unsigned char eth_source[6]; 214 unsigned short eth_proto; 215}; 216 217static __noinline __u64 calc_offset(bool is_ipv6, bool is_icmp) 218{ 219 __u64 off = sizeof(struct eth_hdr); 220 if (is_ipv6) { 221 off += sizeof(struct ipv6hdr); 222 if (is_icmp) 223 off += sizeof(struct icmp6hdr) + sizeof(struct ipv6hdr); 224 } else { 225 off += sizeof(struct iphdr); 226 if (is_icmp) 227 off += sizeof(struct icmphdr) + sizeof(struct iphdr); 228 } 229 return off; 230} 231 232static __attribute__ ((noinline)) 233bool parse_udp(void *data, void *data_end, 234 bool is_ipv6, struct packet_description *pckt) 235{ 236 237 bool is_icmp = !((pckt->flags & (1 << 0)) == 0); 238 __u64 off = calc_offset(is_ipv6, is_icmp); 239 struct udphdr *udp; 240 udp = data + off; 241 242 if (udp + 1 > data_end) 243 return false; 244 if (!is_icmp) { 245 pckt->flow.port16[0] = udp->source; 246 pckt->flow.port16[1] = udp->dest; 247 } else { 248 pckt->flow.port16[0] = udp->dest; 249 pckt->flow.port16[1] = udp->source; 250 } 251 return true; 252} 253 254static __attribute__ ((noinline)) 255bool parse_tcp(void *data, void *data_end, 256 bool is_ipv6, struct packet_description *pckt) 257{ 258 259 bool is_icmp = !((pckt->flags & (1 << 0)) == 0); 260 __u64 off = calc_offset(is_ipv6, is_icmp); 261 struct tcphdr *tcp; 262 263 tcp = data + off; 264 if (tcp + 1 > data_end) 265 return false; 266 if (tcp->syn) 267 pckt->flags |= (1 << 1); 268 if (!is_icmp) { 269 pckt->flow.port16[0] = tcp->source; 270 pckt->flow.port16[1] = tcp->dest; 271 } else { 272 pckt->flow.port16[0] = tcp->dest; 273 pckt->flow.port16[1] = tcp->source; 274 } 275 return true; 276} 277 278static __attribute__ ((noinline)) 279bool encap_v6(struct xdp_md *xdp, struct ctl_value *cval, 280 struct packet_description *pckt, 281 struct real_definition *dst, __u32 pkt_bytes) 282{ 283 struct eth_hdr *new_eth; 284 struct eth_hdr *old_eth; 285 struct ipv6hdr *ip6h; 286 __u32 ip_suffix; 287 void *data_end; 288 void *data; 289 290 if (bpf_xdp_adjust_head(xdp, 0 - (int)sizeof(struct ipv6hdr))) 291 return false; 292 data = (void *)(long)xdp->data; 293 data_end = (void *)(long)xdp->data_end; 294 new_eth = data; 295 ip6h = data + sizeof(struct eth_hdr); 296 old_eth = data + sizeof(struct ipv6hdr); 297 if (new_eth + 1 > data_end || 298 old_eth + 1 > data_end || ip6h + 1 > data_end) 299 return false; 300 memcpy(new_eth->eth_dest, cval->mac, 6); 301 memcpy(new_eth->eth_source, old_eth->eth_dest, 6); 302 new_eth->eth_proto = 56710; 303 ip6h->version = 6; 304 ip6h->priority = 0; 305 memset(ip6h->flow_lbl, 0, sizeof(ip6h->flow_lbl)); 306 307 ip6h->nexthdr = IPPROTO_IPV6; 308 ip_suffix = pckt->flow.srcv6[3] ^ pckt->flow.port16[0]; 309 ip6h->payload_len = 310 bpf_htons(pkt_bytes + sizeof(struct ipv6hdr)); 311 ip6h->hop_limit = 4; 312 313 ip6h->saddr.in6_u.u6_addr32[0] = 1; 314 ip6h->saddr.in6_u.u6_addr32[1] = 2; 315 ip6h->saddr.in6_u.u6_addr32[2] = 3; 316 ip6h->saddr.in6_u.u6_addr32[3] = ip_suffix; 317 memcpy(ip6h->daddr.in6_u.u6_addr32, dst->dstv6, 16); 318 return true; 319} 320 321static __attribute__ ((noinline)) 322bool encap_v4(struct xdp_md *xdp, struct ctl_value *cval, 323 struct packet_description *pckt, 324 struct real_definition *dst, __u32 pkt_bytes) 325{ 326 327 __u32 ip_suffix = bpf_ntohs(pckt->flow.port16[0]); 328 struct eth_hdr *new_eth; 329 struct eth_hdr *old_eth; 330 __u16 *next_iph_u16; 331 struct iphdr *iph; 332 __u32 csum = 0; 333 void *data_end; 334 void *data; 335 336 ip_suffix <<= 15; 337 ip_suffix ^= pckt->flow.src; 338 if (bpf_xdp_adjust_head(xdp, 0 - (int)sizeof(struct iphdr))) 339 return false; 340 data = (void *)(long)xdp->data; 341 data_end = (void *)(long)xdp->data_end; 342 new_eth = data; 343 iph = data + sizeof(struct eth_hdr); 344 old_eth = data + sizeof(struct iphdr); 345 if (new_eth + 1 > data_end || 346 old_eth + 1 > data_end || iph + 1 > data_end) 347 return false; 348 memcpy(new_eth->eth_dest, cval->mac, 6); 349 memcpy(new_eth->eth_source, old_eth->eth_dest, 6); 350 new_eth->eth_proto = 8; 351 iph->version = 4; 352 iph->ihl = 5; 353 iph->frag_off = 0; 354 iph->protocol = IPPROTO_IPIP; 355 iph->check = 0; 356 iph->tos = 1; 357 iph->tot_len = bpf_htons(pkt_bytes + sizeof(struct iphdr)); 358 /* don't update iph->daddr, since it will overwrite old eth_proto 359 * and multiple iterations of bpf_prog_run() will fail 360 */ 361 362 iph->saddr = ((0xFFFF0000 & ip_suffix) | 4268) ^ dst->dst; 363 iph->ttl = 4; 364 365 next_iph_u16 = (__u16 *) iph; 366 __pragma_loop_unroll_full 367 for (int i = 0; i < sizeof(struct iphdr) >> 1; i++) 368 csum += *next_iph_u16++; 369 iph->check = ~((csum & 0xffff) + (csum >> 16)); 370 if (bpf_xdp_adjust_head(xdp, (int)sizeof(struct iphdr))) 371 return false; 372 return true; 373} 374 375static __attribute__ ((noinline)) 376int swap_mac_and_send(void *data, void *data_end) 377{ 378 unsigned char tmp_mac[6]; 379 struct eth_hdr *eth; 380 381 eth = data; 382 memcpy(tmp_mac, eth->eth_source, 6); 383 memcpy(eth->eth_source, eth->eth_dest, 6); 384 memcpy(eth->eth_dest, tmp_mac, 6); 385 return XDP_TX; 386} 387 388static __attribute__ ((noinline)) 389int send_icmp_reply(void *data, void *data_end) 390{ 391 struct icmphdr *icmp_hdr; 392 __u16 *next_iph_u16; 393 __u32 tmp_addr = 0; 394 struct iphdr *iph; 395 __u32 csum = 0; 396 __u64 off = 0; 397 398 if (data + sizeof(struct eth_hdr) 399 + sizeof(struct iphdr) + sizeof(struct icmphdr) > data_end) 400 return XDP_DROP; 401 off += sizeof(struct eth_hdr); 402 iph = data + off; 403 off += sizeof(struct iphdr); 404 icmp_hdr = data + off; 405 icmp_hdr->type = 0; 406 icmp_hdr->checksum += 0x0007; 407 iph->ttl = 4; 408 tmp_addr = iph->daddr; 409 iph->daddr = iph->saddr; 410 iph->saddr = tmp_addr; 411 iph->check = 0; 412 next_iph_u16 = (__u16 *) iph; 413 __pragma_loop_unroll_full 414 for (int i = 0; i < sizeof(struct iphdr) >> 1; i++) 415 csum += *next_iph_u16++; 416 iph->check = ~((csum & 0xffff) + (csum >> 16)); 417 return swap_mac_and_send(data, data_end); 418} 419 420static __attribute__ ((noinline)) 421int send_icmp6_reply(void *data, void *data_end) 422{ 423 struct icmp6hdr *icmp_hdr; 424 struct ipv6hdr *ip6h; 425 __be32 tmp_addr[4]; 426 __u64 off = 0; 427 428 if (data + sizeof(struct eth_hdr) 429 + sizeof(struct ipv6hdr) + sizeof(struct icmp6hdr) > data_end) 430 return XDP_DROP; 431 off += sizeof(struct eth_hdr); 432 ip6h = data + off; 433 off += sizeof(struct ipv6hdr); 434 icmp_hdr = data + off; 435 icmp_hdr->icmp6_type = 129; 436 icmp_hdr->icmp6_cksum -= 0x0001; 437 ip6h->hop_limit = 4; 438 memcpy(tmp_addr, ip6h->saddr.in6_u.u6_addr32, 16); 439 memcpy(ip6h->saddr.in6_u.u6_addr32, ip6h->daddr.in6_u.u6_addr32, 16); 440 memcpy(ip6h->daddr.in6_u.u6_addr32, tmp_addr, 16); 441 return swap_mac_and_send(data, data_end); 442} 443 444static __attribute__ ((noinline)) 445int parse_icmpv6(void *data, void *data_end, __u64 off, 446 struct packet_description *pckt) 447{ 448 struct icmp6hdr *icmp_hdr; 449 struct ipv6hdr *ip6h; 450 451 icmp_hdr = data + off; 452 if (icmp_hdr + 1 > data_end) 453 return XDP_DROP; 454 if (icmp_hdr->icmp6_type == 128) 455 return send_icmp6_reply(data, data_end); 456 if (icmp_hdr->icmp6_type != 3) 457 return XDP_PASS; 458 off += sizeof(struct icmp6hdr); 459 ip6h = data + off; 460 if (ip6h + 1 > data_end) 461 return XDP_DROP; 462 pckt->flow.proto = ip6h->nexthdr; 463 pckt->flags |= (1 << 0); 464 memcpy(pckt->flow.srcv6, ip6h->daddr.in6_u.u6_addr32, 16); 465 memcpy(pckt->flow.dstv6, ip6h->saddr.in6_u.u6_addr32, 16); 466 return -1; 467} 468 469static __attribute__ ((noinline)) 470int parse_icmp(void *data, void *data_end, __u64 off, 471 struct packet_description *pckt) 472{ 473 struct icmphdr *icmp_hdr; 474 struct iphdr *iph; 475 476 icmp_hdr = data + off; 477 if (icmp_hdr + 1 > data_end) 478 return XDP_DROP; 479 if (icmp_hdr->type == 8) 480 return send_icmp_reply(data, data_end); 481 if ((icmp_hdr->type != 3) || (icmp_hdr->code != 4)) 482 return XDP_PASS; 483 off += sizeof(struct icmphdr); 484 iph = data + off; 485 if (iph + 1 > data_end) 486 return XDP_DROP; 487 if (iph->ihl != 5) 488 return XDP_DROP; 489 pckt->flow.proto = iph->protocol; 490 pckt->flags |= (1 << 0); 491 pckt->flow.src = iph->daddr; 492 pckt->flow.dst = iph->saddr; 493 return -1; 494} 495 496static __attribute__ ((noinline)) 497__u32 get_packet_hash(struct packet_description *pckt, 498 bool hash_16bytes) 499{ 500 if (hash_16bytes) 501 return jhash_2words(jhash(pckt->flow.srcv6, 16, 12), 502 pckt->flow.ports, 24); 503 else 504 return jhash_2words(pckt->flow.src, pckt->flow.ports, 505 24); 506} 507 508__attribute__ ((noinline)) 509static bool get_packet_dst(struct real_definition **real, 510 struct packet_description *pckt, 511 struct vip_meta *vip_info, 512 bool is_ipv6, void *lru_map) 513{ 514 struct real_pos_lru new_dst_lru = { }; 515 bool hash_16bytes = is_ipv6; 516 __u32 *real_pos, hash, key; 517 __u64 cur_time; 518 519 if (vip_info->flags & (1 << 2)) 520 hash_16bytes = 1; 521 if (vip_info->flags & (1 << 3)) { 522 pckt->flow.port16[0] = pckt->flow.port16[1]; 523 memset(pckt->flow.srcv6, 0, 16); 524 } 525 hash = get_packet_hash(pckt, hash_16bytes); 526 if (hash != 0x358459b7 /* jhash of ipv4 packet */ && 527 hash != 0x2f4bc6bb /* jhash of ipv6 packet */) 528 return false; 529 key = 2 * vip_info->vip_num + hash % 2; 530 real_pos = bpf_map_lookup_elem(&ch_rings, &key); 531 if (!real_pos) 532 return false; 533 key = *real_pos; 534 *real = bpf_map_lookup_elem(&reals, &key); 535 if (!(*real)) 536 return false; 537 if (!(vip_info->flags & (1 << 1))) { 538 __u32 conn_rate_key = 512 + 2; 539 struct lb_stats *conn_rate_stats = 540 bpf_map_lookup_elem(&stats, &conn_rate_key); 541 542 if (!conn_rate_stats) 543 return true; 544 cur_time = bpf_ktime_get_ns(); 545 if ((cur_time - conn_rate_stats->v2) >> 32 > 0xffFFFF) { 546 conn_rate_stats->v1 = 1; 547 conn_rate_stats->v2 = cur_time; 548 } else { 549 conn_rate_stats->v1 += 1; 550 if (conn_rate_stats->v1 >= 1) 551 return true; 552 } 553 if (pckt->flow.proto == IPPROTO_UDP) 554 new_dst_lru.atime = cur_time; 555 new_dst_lru.pos = key; 556 bpf_map_update_elem(lru_map, &pckt->flow, &new_dst_lru, 0); 557 } 558 return true; 559} 560 561__attribute__ ((noinline)) 562static void connection_table_lookup(struct real_definition **real, 563 struct packet_description *pckt, 564 void *lru_map) 565{ 566 567 struct real_pos_lru *dst_lru; 568 __u64 cur_time; 569 __u32 key; 570 571 dst_lru = bpf_map_lookup_elem(lru_map, &pckt->flow); 572 if (!dst_lru) 573 return; 574 if (pckt->flow.proto == IPPROTO_UDP) { 575 cur_time = bpf_ktime_get_ns(); 576 if (cur_time - dst_lru->atime > 300000) 577 return; 578 dst_lru->atime = cur_time; 579 } 580 key = dst_lru->pos; 581 *real = bpf_map_lookup_elem(&reals, &key); 582} 583 584/* don't believe your eyes! 585 * below function has 6 arguments whereas bpf and llvm allow maximum of 5 586 * but since it's _static_ llvm can optimize one argument away 587 */ 588__attribute__ ((noinline)) 589static int process_l3_headers_v6(struct packet_description *pckt, 590 __u8 *protocol, __u64 off, 591 __u16 *pkt_bytes, void *data, 592 void *data_end) 593{ 594 struct ipv6hdr *ip6h; 595 __u64 iph_len; 596 int action; 597 598 ip6h = data + off; 599 if (ip6h + 1 > data_end) 600 return XDP_DROP; 601 iph_len = sizeof(struct ipv6hdr); 602 *protocol = ip6h->nexthdr; 603 pckt->flow.proto = *protocol; 604 *pkt_bytes = bpf_ntohs(ip6h->payload_len); 605 off += iph_len; 606 if (*protocol == 45) { 607 return XDP_DROP; 608 } else if (*protocol == 59) { 609 action = parse_icmpv6(data, data_end, off, pckt); 610 if (action >= 0) 611 return action; 612 } else { 613 memcpy(pckt->flow.srcv6, ip6h->saddr.in6_u.u6_addr32, 16); 614 memcpy(pckt->flow.dstv6, ip6h->daddr.in6_u.u6_addr32, 16); 615 } 616 return -1; 617} 618 619__attribute__ ((noinline)) 620static int process_l3_headers_v4(struct packet_description *pckt, 621 __u8 *protocol, __u64 off, 622 __u16 *pkt_bytes, void *data, 623 void *data_end) 624{ 625 struct iphdr *iph; 626 int action; 627 628 iph = data + off; 629 if (iph + 1 > data_end) 630 return XDP_DROP; 631 if (iph->ihl != 5) 632 return XDP_DROP; 633 *protocol = iph->protocol; 634 pckt->flow.proto = *protocol; 635 *pkt_bytes = bpf_ntohs(iph->tot_len); 636 off += 20; 637 if (iph->frag_off & 65343) 638 return XDP_DROP; 639 if (*protocol == IPPROTO_ICMP) { 640 action = parse_icmp(data, data_end, off, pckt); 641 if (action >= 0) 642 return action; 643 } else { 644 pckt->flow.src = iph->saddr; 645 pckt->flow.dst = iph->daddr; 646 } 647 return -1; 648} 649 650__attribute__ ((noinline)) 651static int process_packet(void *data, __u64 off, void *data_end, 652 bool is_ipv6, struct xdp_md *xdp) 653{ 654 655 struct real_definition *dst = NULL; 656 struct packet_description pckt = { }; 657 struct vip_definition vip = { }; 658 struct lb_stats *data_stats; 659 void *lru_map = &lru_cache; 660 struct vip_meta *vip_info; 661 __u32 lru_stats_key = 513; 662 __u32 mac_addr_pos = 0; 663 __u32 stats_key = 512; 664 struct ctl_value *cval; 665 __u16 pkt_bytes; 666 __u8 protocol; 667 __u32 vip_num; 668 int action; 669 670 if (is_ipv6) 671 action = process_l3_headers_v6(&pckt, &protocol, off, 672 &pkt_bytes, data, data_end); 673 else 674 action = process_l3_headers_v4(&pckt, &protocol, off, 675 &pkt_bytes, data, data_end); 676 if (action >= 0) 677 return action; 678 protocol = pckt.flow.proto; 679 if (protocol == IPPROTO_TCP) { 680 if (!parse_tcp(data, data_end, is_ipv6, &pckt)) 681 return XDP_DROP; 682 } else if (protocol == IPPROTO_UDP) { 683 if (!parse_udp(data, data_end, is_ipv6, &pckt)) 684 return XDP_DROP; 685 } else { 686 return XDP_TX; 687 } 688 689 if (is_ipv6) 690 memcpy(vip.vipv6, pckt.flow.dstv6, 16); 691 else 692 vip.vip = pckt.flow.dst; 693 vip.port = pckt.flow.port16[1]; 694 vip.proto = pckt.flow.proto; 695 vip_info = bpf_map_lookup_elem(&vip_map, &vip); 696 if (!vip_info) { 697 vip.port = 0; 698 vip_info = bpf_map_lookup_elem(&vip_map, &vip); 699 if (!vip_info) 700 return XDP_PASS; 701 if (!(vip_info->flags & (1 << 4))) 702 pckt.flow.port16[1] = 0; 703 } 704 if (data_end - data > 1400) 705 return XDP_DROP; 706 data_stats = bpf_map_lookup_elem(&stats, &stats_key); 707 if (!data_stats) 708 return XDP_DROP; 709 data_stats->v1 += 1; 710 if (!dst) { 711 if (vip_info->flags & (1 << 0)) 712 pckt.flow.port16[0] = 0; 713 if (!(pckt.flags & (1 << 1)) && !(vip_info->flags & (1 << 1))) 714 connection_table_lookup(&dst, &pckt, lru_map); 715 if (dst) 716 goto out; 717 if (pckt.flow.proto == IPPROTO_TCP) { 718 struct lb_stats *lru_stats = 719 bpf_map_lookup_elem(&stats, &lru_stats_key); 720 721 if (!lru_stats) 722 return XDP_DROP; 723 if (pckt.flags & (1 << 1)) 724 lru_stats->v1 += 1; 725 else 726 lru_stats->v2 += 1; 727 } 728 if (!get_packet_dst(&dst, &pckt, vip_info, is_ipv6, lru_map)) 729 return XDP_DROP; 730 data_stats->v2 += 1; 731 } 732out: 733 cval = bpf_map_lookup_elem(&ctl_array, &mac_addr_pos); 734 if (!cval) 735 return XDP_DROP; 736 if (dst->flags & (1 << 0)) { 737 if (!encap_v6(xdp, cval, &pckt, dst, pkt_bytes)) 738 return XDP_DROP; 739 } else { 740 if (!encap_v4(xdp, cval, &pckt, dst, pkt_bytes)) 741 return XDP_DROP; 742 } 743 vip_num = vip_info->vip_num; 744 data_stats = bpf_map_lookup_elem(&stats, &vip_num); 745 if (!data_stats) 746 return XDP_DROP; 747 data_stats->v1 += 1; 748 data_stats->v2 += pkt_bytes; 749 750 data = (void *)(long)xdp->data; 751 data_end = (void *)(long)xdp->data_end; 752 if (data + 4 > data_end) 753 return XDP_DROP; 754 *(u32 *)data = dst->dst; 755 return XDP_DROP; 756} 757 758SEC("xdp") 759int balancer_ingress_v4(struct xdp_md *ctx) 760{ 761 void *data = (void *)(long)ctx->data; 762 void *data_end = (void *)(long)ctx->data_end; 763 struct eth_hdr *eth = data; 764 __u32 eth_proto; 765 __u32 nh_off; 766 767 nh_off = sizeof(struct eth_hdr); 768 if (data + nh_off > data_end) 769 return XDP_DROP; 770 eth_proto = bpf_ntohs(eth->eth_proto); 771 if (eth_proto == ETH_P_IP) 772 return process_packet(data, nh_off, data_end, 0, ctx); 773 else 774 return XDP_DROP; 775} 776 777SEC("xdp") 778int balancer_ingress_v6(struct xdp_md *ctx) 779{ 780 void *data = (void *)(long)ctx->data; 781 void *data_end = (void *)(long)ctx->data_end; 782 struct eth_hdr *eth = data; 783 __u32 eth_proto; 784 __u32 nh_off; 785 786 nh_off = sizeof(struct eth_hdr); 787 if (data + nh_off > data_end) 788 return XDP_DROP; 789 eth_proto = bpf_ntohs(eth->eth_proto); 790 if (eth_proto == ETH_P_IPV6) 791 return process_packet(data, nh_off, data_end, 1, ctx); 792 else 793 return XDP_DROP; 794} 795 796char _license[] SEC("license") = "GPL"; 797