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} 320 321#ifndef __clang__ 322#pragma GCC push_options 323/* GCC optimization collapses functions and increases the number of arguments 324 * beyond the compatible amount supported by BPF. 325 */ 326#pragma GCC optimize("-fno-ipa-sra") 327#endif 328 329static __attribute__ ((noinline)) 330bool encap_v4(struct xdp_md *xdp, struct ctl_value *cval, 331 struct packet_description *pckt, 332 struct real_definition *dst, __u32 pkt_bytes) 333{ 334 335 __u32 ip_suffix = bpf_ntohs(pckt->flow.port16[0]); 336 struct eth_hdr *new_eth; 337 struct eth_hdr *old_eth; 338 __u16 *next_iph_u16; 339 struct iphdr *iph; 340 __u32 csum = 0; 341 void *data_end; 342 void *data; 343 344 ip_suffix <<= 15; 345 ip_suffix ^= pckt->flow.src; 346 if (bpf_xdp_adjust_head(xdp, 0 - (int)sizeof(struct iphdr))) 347 return false; 348 data = (void *)(long)xdp->data; 349 data_end = (void *)(long)xdp->data_end; 350 new_eth = data; 351 iph = data + sizeof(struct eth_hdr); 352 old_eth = data + sizeof(struct iphdr); 353 if (new_eth + 1 > data_end || 354 old_eth + 1 > data_end || iph + 1 > data_end) 355 return false; 356 memcpy(new_eth->eth_dest, cval->mac, 6); 357 memcpy(new_eth->eth_source, old_eth->eth_dest, 6); 358 new_eth->eth_proto = 8; 359 iph->version = 4; 360 iph->ihl = 5; 361 iph->frag_off = 0; 362 iph->protocol = IPPROTO_IPIP; 363 iph->check = 0; 364 iph->tos = 1; 365 iph->tot_len = bpf_htons(pkt_bytes + sizeof(struct iphdr)); 366 /* don't update iph->daddr, since it will overwrite old eth_proto 367 * and multiple iterations of bpf_prog_run() will fail 368 */ 369 370 iph->saddr = ((0xFFFF0000 & ip_suffix) | 4268) ^ dst->dst; 371 iph->ttl = 4; 372 373 next_iph_u16 = (__u16 *) iph; 374 __pragma_loop_unroll_full 375 for (int i = 0; i < sizeof(struct iphdr) >> 1; i++) 376 csum += *next_iph_u16++; 377 iph->check = ~((csum & 0xffff) + (csum >> 16)); 378 if (bpf_xdp_adjust_head(xdp, (int)sizeof(struct iphdr))) 379 return false; 380 return true; 381} 382 383#ifndef __clang__ 384#pragma GCC pop_options 385#endif 386 387static __attribute__ ((noinline)) 388int swap_mac_and_send(void *data, void *data_end) 389{ 390 unsigned char tmp_mac[6]; 391 struct eth_hdr *eth; 392 393 eth = data; 394 memcpy(tmp_mac, eth->eth_source, 6); 395 memcpy(eth->eth_source, eth->eth_dest, 6); 396 memcpy(eth->eth_dest, tmp_mac, 6); 397 return XDP_TX; 398} 399 400static __attribute__ ((noinline)) 401int send_icmp_reply(void *data, void *data_end) 402{ 403 struct icmphdr *icmp_hdr; 404 __u16 *next_iph_u16; 405 __u32 tmp_addr = 0; 406 struct iphdr *iph; 407 __u32 csum = 0; 408 __u64 off = 0; 409 410 if (data + sizeof(struct eth_hdr) 411 + sizeof(struct iphdr) + sizeof(struct icmphdr) > data_end) 412 return XDP_DROP; 413 off += sizeof(struct eth_hdr); 414 iph = data + off; 415 off += sizeof(struct iphdr); 416 icmp_hdr = data + off; 417 icmp_hdr->type = 0; 418 icmp_hdr->checksum += 0x0007; 419 iph->ttl = 4; 420 tmp_addr = iph->daddr; 421 iph->daddr = iph->saddr; 422 iph->saddr = tmp_addr; 423 iph->check = 0; 424 next_iph_u16 = (__u16 *) iph; 425 __pragma_loop_unroll_full 426 for (int i = 0; i < sizeof(struct iphdr) >> 1; i++) 427 csum += *next_iph_u16++; 428 iph->check = ~((csum & 0xffff) + (csum >> 16)); 429 return swap_mac_and_send(data, data_end); 430} 431 432static __attribute__ ((noinline)) 433int send_icmp6_reply(void *data, void *data_end) 434{ 435 struct icmp6hdr *icmp_hdr; 436 struct ipv6hdr *ip6h; 437 __be32 tmp_addr[4]; 438 __u64 off = 0; 439 440 if (data + sizeof(struct eth_hdr) 441 + sizeof(struct ipv6hdr) + sizeof(struct icmp6hdr) > data_end) 442 return XDP_DROP; 443 off += sizeof(struct eth_hdr); 444 ip6h = data + off; 445 off += sizeof(struct ipv6hdr); 446 icmp_hdr = data + off; 447 icmp_hdr->icmp6_type = 129; 448 icmp_hdr->icmp6_cksum -= 0x0001; 449 ip6h->hop_limit = 4; 450 memcpy(tmp_addr, ip6h->saddr.in6_u.u6_addr32, 16); 451 memcpy(ip6h->saddr.in6_u.u6_addr32, ip6h->daddr.in6_u.u6_addr32, 16); 452 memcpy(ip6h->daddr.in6_u.u6_addr32, tmp_addr, 16); 453 return swap_mac_and_send(data, data_end); 454} 455 456static __attribute__ ((noinline)) 457int parse_icmpv6(void *data, void *data_end, __u64 off, 458 struct packet_description *pckt) 459{ 460 struct icmp6hdr *icmp_hdr; 461 struct ipv6hdr *ip6h; 462 463 icmp_hdr = data + off; 464 if (icmp_hdr + 1 > data_end) 465 return XDP_DROP; 466 if (icmp_hdr->icmp6_type == 128) 467 return send_icmp6_reply(data, data_end); 468 if (icmp_hdr->icmp6_type != 3) 469 return XDP_PASS; 470 off += sizeof(struct icmp6hdr); 471 ip6h = data + off; 472 if (ip6h + 1 > data_end) 473 return XDP_DROP; 474 pckt->flow.proto = ip6h->nexthdr; 475 pckt->flags |= (1 << 0); 476 memcpy(pckt->flow.srcv6, ip6h->daddr.in6_u.u6_addr32, 16); 477 memcpy(pckt->flow.dstv6, ip6h->saddr.in6_u.u6_addr32, 16); 478 return -1; 479} 480 481static __attribute__ ((noinline)) 482int parse_icmp(void *data, void *data_end, __u64 off, 483 struct packet_description *pckt) 484{ 485 struct icmphdr *icmp_hdr; 486 struct iphdr *iph; 487 488 icmp_hdr = data + off; 489 if (icmp_hdr + 1 > data_end) 490 return XDP_DROP; 491 if (icmp_hdr->type == 8) 492 return send_icmp_reply(data, data_end); 493 if ((icmp_hdr->type != 3) || (icmp_hdr->code != 4)) 494 return XDP_PASS; 495 off += sizeof(struct icmphdr); 496 iph = data + off; 497 if (iph + 1 > data_end) 498 return XDP_DROP; 499 if (iph->ihl != 5) 500 return XDP_DROP; 501 pckt->flow.proto = iph->protocol; 502 pckt->flags |= (1 << 0); 503 pckt->flow.src = iph->daddr; 504 pckt->flow.dst = iph->saddr; 505 return -1; 506} 507 508static __attribute__ ((noinline)) 509__u32 get_packet_hash(struct packet_description *pckt, 510 bool hash_16bytes) 511{ 512 if (hash_16bytes) 513 return jhash_2words(jhash(pckt->flow.srcv6, 16, 12), 514 pckt->flow.ports, 24); 515 else 516 return jhash_2words(pckt->flow.src, pckt->flow.ports, 517 24); 518} 519 520__attribute__ ((noinline)) 521static bool get_packet_dst(struct real_definition **real, 522 struct packet_description *pckt, 523 struct vip_meta *vip_info, 524 bool is_ipv6, void *lru_map) 525{ 526 struct real_pos_lru new_dst_lru = { }; 527 bool hash_16bytes = is_ipv6; 528 __u32 *real_pos, hash, key; 529 __u64 cur_time; 530 531 if (vip_info->flags & (1 << 2)) 532 hash_16bytes = 1; 533 if (vip_info->flags & (1 << 3)) { 534 pckt->flow.port16[0] = pckt->flow.port16[1]; 535 memset(pckt->flow.srcv6, 0, 16); 536 } 537 hash = get_packet_hash(pckt, hash_16bytes); 538 if (hash != 0x358459b7 /* jhash of ipv4 packet */ && 539 hash != 0x2f4bc6bb /* jhash of ipv6 packet */) 540 return false; 541 key = 2 * vip_info->vip_num + hash % 2; 542 real_pos = bpf_map_lookup_elem(&ch_rings, &key); 543 if (!real_pos) 544 return false; 545 key = *real_pos; 546 *real = bpf_map_lookup_elem(&reals, &key); 547 if (!(*real)) 548 return false; 549 if (!(vip_info->flags & (1 << 1))) { 550 __u32 conn_rate_key = 512 + 2; 551 struct lb_stats *conn_rate_stats = 552 bpf_map_lookup_elem(&stats, &conn_rate_key); 553 554 if (!conn_rate_stats) 555 return true; 556 cur_time = bpf_ktime_get_ns(); 557 if ((cur_time - conn_rate_stats->v2) >> 32 > 0xffFFFF) { 558 conn_rate_stats->v1 = 1; 559 conn_rate_stats->v2 = cur_time; 560 } else { 561 conn_rate_stats->v1 += 1; 562 if (conn_rate_stats->v1 >= 1) 563 return true; 564 } 565 if (pckt->flow.proto == IPPROTO_UDP) 566 new_dst_lru.atime = cur_time; 567 new_dst_lru.pos = key; 568 bpf_map_update_elem(lru_map, &pckt->flow, &new_dst_lru, 0); 569 } 570 return true; 571} 572 573__attribute__ ((noinline)) 574static void connection_table_lookup(struct real_definition **real, 575 struct packet_description *pckt, 576 void *lru_map) 577{ 578 579 struct real_pos_lru *dst_lru; 580 __u64 cur_time; 581 __u32 key; 582 583 dst_lru = bpf_map_lookup_elem(lru_map, &pckt->flow); 584 if (!dst_lru) 585 return; 586 if (pckt->flow.proto == IPPROTO_UDP) { 587 cur_time = bpf_ktime_get_ns(); 588 if (cur_time - dst_lru->atime > 300000) 589 return; 590 dst_lru->atime = cur_time; 591 } 592 key = dst_lru->pos; 593 *real = bpf_map_lookup_elem(&reals, &key); 594} 595 596/* don't believe your eyes! 597 * below function has 6 arguments whereas bpf and llvm allow maximum of 5 598 * but since it's _static_ llvm can optimize one argument away 599 */ 600__attribute__ ((noinline)) 601static int process_l3_headers_v6(struct packet_description *pckt, 602 __u8 *protocol, __u64 off, 603 __u16 *pkt_bytes, void *extra_args[2]) 604{ 605 struct ipv6hdr *ip6h; 606 __u64 iph_len; 607 int action; 608 void *data = extra_args[0]; 609 void *data_end = extra_args[1]; 610 611 ip6h = data + off; 612 if (ip6h + 1 > data_end) 613 return XDP_DROP; 614 iph_len = sizeof(struct ipv6hdr); 615 *protocol = ip6h->nexthdr; 616 pckt->flow.proto = *protocol; 617 *pkt_bytes = bpf_ntohs(ip6h->payload_len); 618 off += iph_len; 619 if (*protocol == 45) { 620 return XDP_DROP; 621 } else if (*protocol == 59) { 622 action = parse_icmpv6(data, data_end, off, pckt); 623 if (action >= 0) 624 return action; 625 } else { 626 memcpy(pckt->flow.srcv6, ip6h->saddr.in6_u.u6_addr32, 16); 627 memcpy(pckt->flow.dstv6, ip6h->daddr.in6_u.u6_addr32, 16); 628 } 629 return -1; 630} 631 632__attribute__ ((noinline)) 633static int process_l3_headers_v4(struct packet_description *pckt, 634 __u8 *protocol, __u64 off, 635 __u16 *pkt_bytes, void *extra_args[2]) 636{ 637 struct iphdr *iph; 638 int action; 639 void *data = extra_args[0]; 640 void *data_end = extra_args[1]; 641 642 iph = data + off; 643 if (iph + 1 > data_end) 644 return XDP_DROP; 645 if (iph->ihl != 5) 646 return XDP_DROP; 647 *protocol = iph->protocol; 648 pckt->flow.proto = *protocol; 649 *pkt_bytes = bpf_ntohs(iph->tot_len); 650 off += 20; 651 if (iph->frag_off & 65343) 652 return XDP_DROP; 653 if (*protocol == IPPROTO_ICMP) { 654 action = parse_icmp(data, data_end, off, pckt); 655 if (action >= 0) 656 return action; 657 } else { 658 pckt->flow.src = iph->saddr; 659 pckt->flow.dst = iph->daddr; 660 } 661 return -1; 662} 663 664__attribute__ ((noinline)) 665static int process_packet(void *data, __u64 off, void *data_end, 666 bool is_ipv6, struct xdp_md *xdp) 667{ 668 669 struct real_definition *dst = NULL; 670 struct packet_description pckt = { }; 671 struct vip_definition vip = { }; 672 struct lb_stats *data_stats; 673 void *lru_map = &lru_cache; 674 struct vip_meta *vip_info; 675 __u32 lru_stats_key = 513; 676 __u32 mac_addr_pos = 0; 677 __u32 stats_key = 512; 678 struct ctl_value *cval; 679 __u16 pkt_bytes; 680 __u8 protocol; 681 __u32 vip_num; 682 int action; 683 void *extra_args[2] = { data, data_end }; 684 685 if (is_ipv6) 686 action = process_l3_headers_v6(&pckt, &protocol, off, 687 &pkt_bytes, extra_args); 688 else 689 action = process_l3_headers_v4(&pckt, &protocol, off, 690 &pkt_bytes, extra_args); 691 if (action >= 0) 692 return action; 693 protocol = pckt.flow.proto; 694 if (protocol == IPPROTO_TCP) { 695 if (!parse_tcp(data, data_end, is_ipv6, &pckt)) 696 return XDP_DROP; 697 } else if (protocol == IPPROTO_UDP) { 698 if (!parse_udp(data, data_end, is_ipv6, &pckt)) 699 return XDP_DROP; 700 } else { 701 return XDP_TX; 702 } 703 704 if (is_ipv6) 705 memcpy(vip.vipv6, pckt.flow.dstv6, 16); 706 else 707 vip.vip = pckt.flow.dst; 708 vip.port = pckt.flow.port16[1]; 709 vip.proto = pckt.flow.proto; 710 vip_info = bpf_map_lookup_elem(&vip_map, &vip); 711 if (!vip_info) { 712 vip.port = 0; 713 vip_info = bpf_map_lookup_elem(&vip_map, &vip); 714 if (!vip_info) 715 return XDP_PASS; 716 if (!(vip_info->flags & (1 << 4))) 717 pckt.flow.port16[1] = 0; 718 } 719 if (data_end - data > 1400) 720 return XDP_DROP; 721 data_stats = bpf_map_lookup_elem(&stats, &stats_key); 722 if (!data_stats) 723 return XDP_DROP; 724 data_stats->v1 += 1; 725 if (!dst) { 726 if (vip_info->flags & (1 << 0)) 727 pckt.flow.port16[0] = 0; 728 if (!(pckt.flags & (1 << 1)) && !(vip_info->flags & (1 << 1))) 729 connection_table_lookup(&dst, &pckt, lru_map); 730 if (dst) 731 goto out; 732 if (pckt.flow.proto == IPPROTO_TCP) { 733 struct lb_stats *lru_stats = 734 bpf_map_lookup_elem(&stats, &lru_stats_key); 735 736 if (!lru_stats) 737 return XDP_DROP; 738 if (pckt.flags & (1 << 1)) 739 lru_stats->v1 += 1; 740 else 741 lru_stats->v2 += 1; 742 } 743 if (!get_packet_dst(&dst, &pckt, vip_info, is_ipv6, lru_map)) 744 return XDP_DROP; 745 data_stats->v2 += 1; 746 } 747out: 748 cval = bpf_map_lookup_elem(&ctl_array, &mac_addr_pos); 749 if (!cval) 750 return XDP_DROP; 751 if (dst->flags & (1 << 0)) { 752 if (!encap_v6(xdp, cval, &pckt, dst, pkt_bytes)) 753 return XDP_DROP; 754 } else { 755 if (!encap_v4(xdp, cval, &pckt, dst, pkt_bytes)) 756 return XDP_DROP; 757 } 758 vip_num = vip_info->vip_num; 759 data_stats = bpf_map_lookup_elem(&stats, &vip_num); 760 if (!data_stats) 761 return XDP_DROP; 762 data_stats->v1 += 1; 763 data_stats->v2 += pkt_bytes; 764 765 data = (void *)(long)xdp->data; 766 data_end = (void *)(long)xdp->data_end; 767 if (data + 4 > data_end) 768 return XDP_DROP; 769 *(u32 *)data = dst->dst; 770 return XDP_DROP; 771} 772 773SEC("xdp") 774int balancer_ingress_v4(struct xdp_md *ctx) 775{ 776 void *data = (void *)(long)ctx->data; 777 void *data_end = (void *)(long)ctx->data_end; 778 struct eth_hdr *eth = data; 779 __u32 eth_proto; 780 __u32 nh_off; 781 782 nh_off = sizeof(struct eth_hdr); 783 if (data + nh_off > data_end) 784 return XDP_DROP; 785 eth_proto = bpf_ntohs(eth->eth_proto); 786 if (eth_proto == ETH_P_IP) 787 return process_packet(data, nh_off, data_end, 0, ctx); 788 else 789 return XDP_DROP; 790} 791 792SEC("xdp") 793int balancer_ingress_v6(struct xdp_md *ctx) 794{ 795 void *data = (void *)(long)ctx->data; 796 void *data_end = (void *)(long)ctx->data_end; 797 struct eth_hdr *eth = data; 798 __u32 eth_proto; 799 __u32 nh_off; 800 801 nh_off = sizeof(struct eth_hdr); 802 if (data + nh_off > data_end) 803 return XDP_DROP; 804 eth_proto = bpf_ntohs(eth->eth_proto); 805 if (eth_proto == ETH_P_IPV6) 806 return process_packet(data, nh_off, data_end, 1, ctx); 807 else 808 return XDP_DROP; 809} 810 811char _license[] SEC("license") = "GPL"; 812