1
2
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_helpers.h"
17
18#define bpf_printk(fmt, ...) \
19({ \
20 char ____fmt[] = fmt; \
21 bpf_trace_printk(____fmt, sizeof(____fmt), \
22 ##__VA_ARGS__); \
23})
24
25static __u32 rol32(__u32 word, unsigned int shift)
26{
27 return (word << shift) | (word >> ((-shift) & 31));
28}
29
30
31
32
33#define __jhash_mix(a, b, c) \
34{ \
35 a -= c; a ^= rol32(c, 4); c += b; \
36 b -= a; b ^= rol32(a, 6); a += c; \
37 c -= b; c ^= rol32(b, 8); b += a; \
38 a -= c; a ^= rol32(c, 16); c += b; \
39 b -= a; b ^= rol32(a, 19); a += c; \
40 c -= b; c ^= rol32(b, 4); b += a; \
41}
42
43#define __jhash_final(a, b, c) \
44{ \
45 c ^= b; c -= rol32(b, 14); \
46 a ^= c; a -= rol32(c, 11); \
47 b ^= a; b -= rol32(a, 25); \
48 c ^= b; c -= rol32(b, 16); \
49 a ^= c; a -= rol32(c, 4); \
50 b ^= a; b -= rol32(a, 14); \
51 c ^= b; c -= rol32(b, 24); \
52}
53
54#define JHASH_INITVAL 0xdeadbeef
55
56typedef unsigned int u32;
57
58static __attribute__ ((noinline))
59u32 jhash(const void *key, u32 length, u32 initval)
60{
61 u32 a, b, c;
62 const unsigned char *k = key;
63
64 a = b = c = JHASH_INITVAL + length + initval;
65
66 while (length > 12) {
67 a += *(u32 *)(k);
68 b += *(u32 *)(k + 4);
69 c += *(u32 *)(k + 8);
70 __jhash_mix(a, b, c);
71 length -= 12;
72 k += 12;
73 }
74 switch (length) {
75 case 12: c += (u32)k[11]<<24;
76 case 11: c += (u32)k[10]<<16;
77 case 10: c += (u32)k[9]<<8;
78 case 9: c += k[8];
79 case 8: b += (u32)k[7]<<24;
80 case 7: b += (u32)k[6]<<16;
81 case 6: b += (u32)k[5]<<8;
82 case 5: b += k[4];
83 case 4: a += (u32)k[3]<<24;
84 case 3: a += (u32)k[2]<<16;
85 case 2: a += (u32)k[1]<<8;
86 case 1: a += k[0];
87 __jhash_final(a, b, c);
88 case 0:
89 break;
90 }
91
92 return c;
93}
94
95static __attribute__ ((noinline))
96u32 __jhash_nwords(u32 a, u32 b, u32 c, u32 initval)
97{
98 a += initval;
99 b += initval;
100 c += initval;
101 __jhash_final(a, b, c);
102 return c;
103}
104
105static __attribute__ ((noinline))
106u32 jhash_2words(u32 a, u32 b, u32 initval)
107{
108 return __jhash_nwords(a, b, 0, initval + JHASH_INITVAL + (2 << 2));
109}
110
111struct flow_key {
112 union {
113 __be32 src;
114 __be32 srcv6[4];
115 };
116 union {
117 __be32 dst;
118 __be32 dstv6[4];
119 };
120 union {
121 __u32 ports;
122 __u16 port16[2];
123 };
124 __u8 proto;
125};
126
127struct packet_description {
128 struct flow_key flow;
129 __u8 flags;
130};
131
132struct ctl_value {
133 union {
134 __u64 value;
135 __u32 ifindex;
136 __u8 mac[6];
137 };
138};
139
140struct vip_definition {
141 union {
142 __be32 vip;
143 __be32 vipv6[4];
144 };
145 __u16 port;
146 __u16 family;
147 __u8 proto;
148};
149
150struct vip_meta {
151 __u32 flags;
152 __u32 vip_num;
153};
154
155struct real_pos_lru {
156 __u32 pos;
157 __u64 atime;
158};
159
160struct real_definition {
161 union {
162 __be32 dst;
163 __be32 dstv6[4];
164 };
165 __u8 flags;
166};
167
168struct lb_stats {
169 __u64 v2;
170 __u64 v1;
171};
172
173struct bpf_map_def __attribute__ ((section("maps"), used)) vip_map = {
174 .type = BPF_MAP_TYPE_HASH,
175 .key_size = sizeof(struct vip_definition),
176 .value_size = sizeof(struct vip_meta),
177 .max_entries = 512,
178 .map_flags = 0,
179};
180
181struct bpf_map_def __attribute__ ((section("maps"), used)) lru_cache = {
182 .type = BPF_MAP_TYPE_LRU_HASH,
183 .key_size = sizeof(struct flow_key),
184 .value_size = sizeof(struct real_pos_lru),
185 .max_entries = 300,
186 .map_flags = 1U << 1,
187};
188
189struct bpf_map_def __attribute__ ((section("maps"), used)) ch_rings = {
190 .type = BPF_MAP_TYPE_ARRAY,
191 .key_size = sizeof(__u32),
192 .value_size = sizeof(__u32),
193 .max_entries = 12 * 655,
194 .map_flags = 0,
195};
196
197struct bpf_map_def __attribute__ ((section("maps"), used)) reals = {
198 .type = BPF_MAP_TYPE_ARRAY,
199 .key_size = sizeof(__u32),
200 .value_size = sizeof(struct real_definition),
201 .max_entries = 40,
202 .map_flags = 0,
203};
204
205struct bpf_map_def __attribute__ ((section("maps"), used)) stats = {
206 .type = BPF_MAP_TYPE_PERCPU_ARRAY,
207 .key_size = sizeof(__u32),
208 .value_size = sizeof(struct lb_stats),
209 .max_entries = 515,
210 .map_flags = 0,
211};
212
213struct bpf_map_def __attribute__ ((section("maps"), used)) ctl_array = {
214 .type = BPF_MAP_TYPE_ARRAY,
215 .key_size = sizeof(__u32),
216 .value_size = sizeof(struct ctl_value),
217 .max_entries = 16,
218 .map_flags = 0,
219};
220
221struct eth_hdr {
222 unsigned char eth_dest[6];
223 unsigned char eth_source[6];
224 unsigned short eth_proto;
225};
226
227static inline __u64 calc_offset(bool is_ipv6, bool is_icmp)
228{
229 __u64 off = sizeof(struct eth_hdr);
230 if (is_ipv6) {
231 off += sizeof(struct ipv6hdr);
232 if (is_icmp)
233 off += sizeof(struct icmp6hdr) + sizeof(struct ipv6hdr);
234 } else {
235 off += sizeof(struct iphdr);
236 if (is_icmp)
237 off += sizeof(struct icmphdr) + sizeof(struct iphdr);
238 }
239 return off;
240}
241
242static __attribute__ ((noinline))
243bool parse_udp(void *data, void *data_end,
244 bool is_ipv6, struct packet_description *pckt)
245{
246
247 bool is_icmp = !((pckt->flags & (1 << 0)) == 0);
248 __u64 off = calc_offset(is_ipv6, is_icmp);
249 struct udphdr *udp;
250 udp = data + off;
251
252 if (udp + 1 > data_end)
253 return 0;
254 if (!is_icmp) {
255 pckt->flow.port16[0] = udp->source;
256 pckt->flow.port16[1] = udp->dest;
257 } else {
258 pckt->flow.port16[0] = udp->dest;
259 pckt->flow.port16[1] = udp->source;
260 }
261 return 1;
262}
263
264static __attribute__ ((noinline))
265bool parse_tcp(void *data, void *data_end,
266 bool is_ipv6, struct packet_description *pckt)
267{
268
269 bool is_icmp = !((pckt->flags & (1 << 0)) == 0);
270 __u64 off = calc_offset(is_ipv6, is_icmp);
271 struct tcphdr *tcp;
272
273 tcp = data + off;
274 if (tcp + 1 > data_end)
275 return 0;
276 if (tcp->syn)
277 pckt->flags |= (1 << 1);
278 if (!is_icmp) {
279 pckt->flow.port16[0] = tcp->source;
280 pckt->flow.port16[1] = tcp->dest;
281 } else {
282 pckt->flow.port16[0] = tcp->dest;
283 pckt->flow.port16[1] = tcp->source;
284 }
285 return 1;
286}
287
288static __attribute__ ((noinline))
289bool encap_v6(struct xdp_md *xdp, struct ctl_value *cval,
290 struct packet_description *pckt,
291 struct real_definition *dst, __u32 pkt_bytes)
292{
293 struct eth_hdr *new_eth;
294 struct eth_hdr *old_eth;
295 struct ipv6hdr *ip6h;
296 __u32 ip_suffix;
297 void *data_end;
298 void *data;
299
300 if (bpf_xdp_adjust_head(xdp, 0 - (int)sizeof(struct ipv6hdr)))
301 return 0;
302 data = (void *)(long)xdp->data;
303 data_end = (void *)(long)xdp->data_end;
304 new_eth = data;
305 ip6h = data + sizeof(struct eth_hdr);
306 old_eth = data + sizeof(struct ipv6hdr);
307 if (new_eth + 1 > data_end ||
308 old_eth + 1 > data_end || ip6h + 1 > data_end)
309 return 0;
310 memcpy(new_eth->eth_dest, cval->mac, 6);
311 memcpy(new_eth->eth_source, old_eth->eth_dest, 6);
312 new_eth->eth_proto = 56710;
313 ip6h->version = 6;
314 ip6h->priority = 0;
315 memset(ip6h->flow_lbl, 0, sizeof(ip6h->flow_lbl));
316
317 ip6h->nexthdr = IPPROTO_IPV6;
318 ip_suffix = pckt->flow.srcv6[3] ^ pckt->flow.port16[0];
319 ip6h->payload_len =
320 __builtin_bswap16(pkt_bytes + sizeof(struct ipv6hdr));
321 ip6h->hop_limit = 4;
322
323 ip6h->saddr.in6_u.u6_addr32[0] = 1;
324 ip6h->saddr.in6_u.u6_addr32[1] = 2;
325 ip6h->saddr.in6_u.u6_addr32[2] = 3;
326 ip6h->saddr.in6_u.u6_addr32[3] = ip_suffix;
327 memcpy(ip6h->daddr.in6_u.u6_addr32, dst->dstv6, 16);
328 return 1;
329}
330
331static __attribute__ ((noinline))
332bool encap_v4(struct xdp_md *xdp, struct ctl_value *cval,
333 struct packet_description *pckt,
334 struct real_definition *dst, __u32 pkt_bytes)
335{
336
337 __u32 ip_suffix = __builtin_bswap16(pckt->flow.port16[0]);
338 struct eth_hdr *new_eth;
339 struct eth_hdr *old_eth;
340 __u16 *next_iph_u16;
341 struct iphdr *iph;
342 __u32 csum = 0;
343 void *data_end;
344 void *data;
345
346 ip_suffix <<= 15;
347 ip_suffix ^= pckt->flow.src;
348 if (bpf_xdp_adjust_head(xdp, 0 - (int)sizeof(struct iphdr)))
349 return 0;
350 data = (void *)(long)xdp->data;
351 data_end = (void *)(long)xdp->data_end;
352 new_eth = data;
353 iph = data + sizeof(struct eth_hdr);
354 old_eth = data + sizeof(struct iphdr);
355 if (new_eth + 1 > data_end ||
356 old_eth + 1 > data_end || iph + 1 > data_end)
357 return 0;
358 memcpy(new_eth->eth_dest, cval->mac, 6);
359 memcpy(new_eth->eth_source, old_eth->eth_dest, 6);
360 new_eth->eth_proto = 8;
361 iph->version = 4;
362 iph->ihl = 5;
363 iph->frag_off = 0;
364 iph->protocol = IPPROTO_IPIP;
365 iph->check = 0;
366 iph->tos = 1;
367 iph->tot_len = __builtin_bswap16(pkt_bytes + sizeof(struct iphdr));
368
369
370
371
372 iph->saddr = ((0xFFFF0000 & ip_suffix) | 4268) ^ dst->dst;
373 iph->ttl = 4;
374
375 next_iph_u16 = (__u16 *) iph;
376#pragma clang loop unroll(full)
377 for (int i = 0; i < sizeof(struct iphdr) >> 1; i++)
378 csum += *next_iph_u16++;
379 iph->check = ~((csum & 0xffff) + (csum >> 16));
380 if (bpf_xdp_adjust_head(xdp, (int)sizeof(struct iphdr)))
381 return 0;
382 return 1;
383}
384
385static __attribute__ ((noinline))
386bool decap_v6(struct xdp_md *xdp, void **data, void **data_end, bool inner_v4)
387{
388 struct eth_hdr *new_eth;
389 struct eth_hdr *old_eth;
390
391 old_eth = *data;
392 new_eth = *data + sizeof(struct ipv6hdr);
393 memcpy(new_eth->eth_source, old_eth->eth_source, 6);
394 memcpy(new_eth->eth_dest, old_eth->eth_dest, 6);
395 if (inner_v4)
396 new_eth->eth_proto = 8;
397 else
398 new_eth->eth_proto = 56710;
399 if (bpf_xdp_adjust_head(xdp, (int)sizeof(struct ipv6hdr)))
400 return 0;
401 *data = (void *)(long)xdp->data;
402 *data_end = (void *)(long)xdp->data_end;
403 return 1;
404}
405
406static __attribute__ ((noinline))
407bool decap_v4(struct xdp_md *xdp, void **data, void **data_end)
408{
409 struct eth_hdr *new_eth;
410 struct eth_hdr *old_eth;
411
412 old_eth = *data;
413 new_eth = *data + sizeof(struct iphdr);
414 memcpy(new_eth->eth_source, old_eth->eth_source, 6);
415 memcpy(new_eth->eth_dest, old_eth->eth_dest, 6);
416 new_eth->eth_proto = 8;
417 if (bpf_xdp_adjust_head(xdp, (int)sizeof(struct iphdr)))
418 return 0;
419 *data = (void *)(long)xdp->data;
420 *data_end = (void *)(long)xdp->data_end;
421 return 1;
422}
423
424static __attribute__ ((noinline))
425int swap_mac_and_send(void *data, void *data_end)
426{
427 unsigned char tmp_mac[6];
428 struct eth_hdr *eth;
429
430 eth = data;
431 memcpy(tmp_mac, eth->eth_source, 6);
432 memcpy(eth->eth_source, eth->eth_dest, 6);
433 memcpy(eth->eth_dest, tmp_mac, 6);
434 return XDP_TX;
435}
436
437static __attribute__ ((noinline))
438int send_icmp_reply(void *data, void *data_end)
439{
440 struct icmphdr *icmp_hdr;
441 __u16 *next_iph_u16;
442 __u32 tmp_addr = 0;
443 struct iphdr *iph;
444 __u32 csum1 = 0;
445 __u32 csum = 0;
446 __u64 off = 0;
447
448 if (data + sizeof(struct eth_hdr)
449 + sizeof(struct iphdr) + sizeof(struct icmphdr) > data_end)
450 return XDP_DROP;
451 off += sizeof(struct eth_hdr);
452 iph = data + off;
453 off += sizeof(struct iphdr);
454 icmp_hdr = data + off;
455 icmp_hdr->type = 0;
456 icmp_hdr->checksum += 0x0007;
457 iph->ttl = 4;
458 tmp_addr = iph->daddr;
459 iph->daddr = iph->saddr;
460 iph->saddr = tmp_addr;
461 iph->check = 0;
462 next_iph_u16 = (__u16 *) iph;
463#pragma clang loop unroll(full)
464 for (int i = 0; i < sizeof(struct iphdr) >> 1; i++)
465 csum += *next_iph_u16++;
466 iph->check = ~((csum & 0xffff) + (csum >> 16));
467 return swap_mac_and_send(data, data_end);
468}
469
470static __attribute__ ((noinline))
471int send_icmp6_reply(void *data, void *data_end)
472{
473 struct icmp6hdr *icmp_hdr;
474 struct ipv6hdr *ip6h;
475 __be32 tmp_addr[4];
476 __u64 off = 0;
477
478 if (data + sizeof(struct eth_hdr)
479 + sizeof(struct ipv6hdr) + sizeof(struct icmp6hdr) > data_end)
480 return XDP_DROP;
481 off += sizeof(struct eth_hdr);
482 ip6h = data + off;
483 off += sizeof(struct ipv6hdr);
484 icmp_hdr = data + off;
485 icmp_hdr->icmp6_type = 129;
486 icmp_hdr->icmp6_cksum -= 0x0001;
487 ip6h->hop_limit = 4;
488 memcpy(tmp_addr, ip6h->saddr.in6_u.u6_addr32, 16);
489 memcpy(ip6h->saddr.in6_u.u6_addr32, ip6h->daddr.in6_u.u6_addr32, 16);
490 memcpy(ip6h->daddr.in6_u.u6_addr32, tmp_addr, 16);
491 return swap_mac_and_send(data, data_end);
492}
493
494static __attribute__ ((noinline))
495int parse_icmpv6(void *data, void *data_end, __u64 off,
496 struct packet_description *pckt)
497{
498 struct icmp6hdr *icmp_hdr;
499 struct ipv6hdr *ip6h;
500
501 icmp_hdr = data + off;
502 if (icmp_hdr + 1 > data_end)
503 return XDP_DROP;
504 if (icmp_hdr->icmp6_type == 128)
505 return send_icmp6_reply(data, data_end);
506 if (icmp_hdr->icmp6_type != 3)
507 return XDP_PASS;
508 off += sizeof(struct icmp6hdr);
509 ip6h = data + off;
510 if (ip6h + 1 > data_end)
511 return XDP_DROP;
512 pckt->flow.proto = ip6h->nexthdr;
513 pckt->flags |= (1 << 0);
514 memcpy(pckt->flow.srcv6, ip6h->daddr.in6_u.u6_addr32, 16);
515 memcpy(pckt->flow.dstv6, ip6h->saddr.in6_u.u6_addr32, 16);
516 return -1;
517}
518
519static __attribute__ ((noinline))
520int parse_icmp(void *data, void *data_end, __u64 off,
521 struct packet_description *pckt)
522{
523 struct icmphdr *icmp_hdr;
524 struct iphdr *iph;
525
526 icmp_hdr = data + off;
527 if (icmp_hdr + 1 > data_end)
528 return XDP_DROP;
529 if (icmp_hdr->type == 8)
530 return send_icmp_reply(data, data_end);
531 if ((icmp_hdr->type != 3) || (icmp_hdr->code != 4))
532 return XDP_PASS;
533 off += sizeof(struct icmphdr);
534 iph = data + off;
535 if (iph + 1 > data_end)
536 return XDP_DROP;
537 if (iph->ihl != 5)
538 return XDP_DROP;
539 pckt->flow.proto = iph->protocol;
540 pckt->flags |= (1 << 0);
541 pckt->flow.src = iph->daddr;
542 pckt->flow.dst = iph->saddr;
543 return -1;
544}
545
546static __attribute__ ((noinline))
547__u32 get_packet_hash(struct packet_description *pckt,
548 bool hash_16bytes)
549{
550 if (hash_16bytes)
551 return jhash_2words(jhash(pckt->flow.srcv6, 16, 12),
552 pckt->flow.ports, 24);
553 else
554 return jhash_2words(pckt->flow.src, pckt->flow.ports,
555 24);
556}
557
558__attribute__ ((noinline))
559static bool get_packet_dst(struct real_definition **real,
560 struct packet_description *pckt,
561 struct vip_meta *vip_info,
562 bool is_ipv6, void *lru_map)
563{
564 struct real_pos_lru new_dst_lru = { };
565 bool hash_16bytes = is_ipv6;
566 __u32 *real_pos, hash, key;
567 __u64 cur_time;
568
569 if (vip_info->flags & (1 << 2))
570 hash_16bytes = 1;
571 if (vip_info->flags & (1 << 3)) {
572 pckt->flow.port16[0] = pckt->flow.port16[1];
573 memset(pckt->flow.srcv6, 0, 16);
574 }
575 hash = get_packet_hash(pckt, hash_16bytes);
576 if (hash != 0x358459b7 &&
577 hash != 0x2f4bc6bb )
578 return 0;
579 key = 2 * vip_info->vip_num + hash % 2;
580 real_pos = bpf_map_lookup_elem(&ch_rings, &key);
581 if (!real_pos)
582 return 0;
583 key = *real_pos;
584 *real = bpf_map_lookup_elem(&reals, &key);
585 if (!(*real))
586 return 0;
587 if (!(vip_info->flags & (1 << 1))) {
588 __u32 conn_rate_key = 512 + 2;
589 struct lb_stats *conn_rate_stats =
590 bpf_map_lookup_elem(&stats, &conn_rate_key);
591
592 if (!conn_rate_stats)
593 return 1;
594 cur_time = bpf_ktime_get_ns();
595 if ((cur_time - conn_rate_stats->v2) >> 32 > 0xffFFFF) {
596 conn_rate_stats->v1 = 1;
597 conn_rate_stats->v2 = cur_time;
598 } else {
599 conn_rate_stats->v1 += 1;
600 if (conn_rate_stats->v1 >= 1)
601 return 1;
602 }
603 if (pckt->flow.proto == IPPROTO_UDP)
604 new_dst_lru.atime = cur_time;
605 new_dst_lru.pos = key;
606 bpf_map_update_elem(lru_map, &pckt->flow, &new_dst_lru, 0);
607 }
608 return 1;
609}
610
611__attribute__ ((noinline))
612static void connection_table_lookup(struct real_definition **real,
613 struct packet_description *pckt,
614 void *lru_map)
615{
616
617 struct real_pos_lru *dst_lru;
618 __u64 cur_time;
619 __u32 key;
620
621 dst_lru = bpf_map_lookup_elem(lru_map, &pckt->flow);
622 if (!dst_lru)
623 return;
624 if (pckt->flow.proto == IPPROTO_UDP) {
625 cur_time = bpf_ktime_get_ns();
626 if (cur_time - dst_lru->atime > 300000)
627 return;
628 dst_lru->atime = cur_time;
629 }
630 key = dst_lru->pos;
631 *real = bpf_map_lookup_elem(&reals, &key);
632}
633
634
635
636
637
638__attribute__ ((noinline))
639static int process_l3_headers_v6(struct packet_description *pckt,
640 __u8 *protocol, __u64 off,
641 __u16 *pkt_bytes, void *data,
642 void *data_end)
643{
644 struct ipv6hdr *ip6h;
645 __u64 iph_len;
646 int action;
647
648 ip6h = data + off;
649 if (ip6h + 1 > data_end)
650 return XDP_DROP;
651 iph_len = sizeof(struct ipv6hdr);
652 *protocol = ip6h->nexthdr;
653 pckt->flow.proto = *protocol;
654 *pkt_bytes = __builtin_bswap16(ip6h->payload_len);
655 off += iph_len;
656 if (*protocol == 45) {
657 return XDP_DROP;
658 } else if (*protocol == 59) {
659 action = parse_icmpv6(data, data_end, off, pckt);
660 if (action >= 0)
661 return action;
662 } else {
663 memcpy(pckt->flow.srcv6, ip6h->saddr.in6_u.u6_addr32, 16);
664 memcpy(pckt->flow.dstv6, ip6h->daddr.in6_u.u6_addr32, 16);
665 }
666 return -1;
667}
668
669__attribute__ ((noinline))
670static int process_l3_headers_v4(struct packet_description *pckt,
671 __u8 *protocol, __u64 off,
672 __u16 *pkt_bytes, void *data,
673 void *data_end)
674{
675 struct iphdr *iph;
676 __u64 iph_len;
677 int action;
678
679 iph = data + off;
680 if (iph + 1 > data_end)
681 return XDP_DROP;
682 if (iph->ihl != 5)
683 return XDP_DROP;
684 *protocol = iph->protocol;
685 pckt->flow.proto = *protocol;
686 *pkt_bytes = __builtin_bswap16(iph->tot_len);
687 off += 20;
688 if (iph->frag_off & 65343)
689 return XDP_DROP;
690 if (*protocol == IPPROTO_ICMP) {
691 action = parse_icmp(data, data_end, off, pckt);
692 if (action >= 0)
693 return action;
694 } else {
695 pckt->flow.src = iph->saddr;
696 pckt->flow.dst = iph->daddr;
697 }
698 return -1;
699}
700
701__attribute__ ((noinline))
702static int process_packet(void *data, __u64 off, void *data_end,
703 bool is_ipv6, struct xdp_md *xdp)
704{
705
706 struct real_definition *dst = NULL;
707 struct packet_description pckt = { };
708 struct vip_definition vip = { };
709 struct lb_stats *data_stats;
710 struct eth_hdr *eth = data;
711 void *lru_map = &lru_cache;
712 struct vip_meta *vip_info;
713 __u32 lru_stats_key = 513;
714 __u32 mac_addr_pos = 0;
715 __u32 stats_key = 512;
716 struct ctl_value *cval;
717 __u16 pkt_bytes;
718 __u64 iph_len;
719 __u8 protocol;
720 __u32 vip_num;
721 int action;
722
723 if (is_ipv6)
724 action = process_l3_headers_v6(&pckt, &protocol, off,
725 &pkt_bytes, data, data_end);
726 else
727 action = process_l3_headers_v4(&pckt, &protocol, off,
728 &pkt_bytes, data, data_end);
729 if (action >= 0)
730 return action;
731 protocol = pckt.flow.proto;
732 if (protocol == IPPROTO_TCP) {
733 if (!parse_tcp(data, data_end, is_ipv6, &pckt))
734 return XDP_DROP;
735 } else if (protocol == IPPROTO_UDP) {
736 if (!parse_udp(data, data_end, is_ipv6, &pckt))
737 return XDP_DROP;
738 } else {
739 return XDP_TX;
740 }
741
742 if (is_ipv6)
743 memcpy(vip.vipv6, pckt.flow.dstv6, 16);
744 else
745 vip.vip = pckt.flow.dst;
746 vip.port = pckt.flow.port16[1];
747 vip.proto = pckt.flow.proto;
748 vip_info = bpf_map_lookup_elem(&vip_map, &vip);
749 if (!vip_info) {
750 vip.port = 0;
751 vip_info = bpf_map_lookup_elem(&vip_map, &vip);
752 if (!vip_info)
753 return XDP_PASS;
754 if (!(vip_info->flags & (1 << 4)))
755 pckt.flow.port16[1] = 0;
756 }
757 if (data_end - data > 1400)
758 return XDP_DROP;
759 data_stats = bpf_map_lookup_elem(&stats, &stats_key);
760 if (!data_stats)
761 return XDP_DROP;
762 data_stats->v1 += 1;
763 if (!dst) {
764 if (vip_info->flags & (1 << 0))
765 pckt.flow.port16[0] = 0;
766 if (!(pckt.flags & (1 << 1)) && !(vip_info->flags & (1 << 1)))
767 connection_table_lookup(&dst, &pckt, lru_map);
768 if (dst)
769 goto out;
770 if (pckt.flow.proto == IPPROTO_TCP) {
771 struct lb_stats *lru_stats =
772 bpf_map_lookup_elem(&stats, &lru_stats_key);
773
774 if (!lru_stats)
775 return XDP_DROP;
776 if (pckt.flags & (1 << 1))
777 lru_stats->v1 += 1;
778 else
779 lru_stats->v2 += 1;
780 }
781 if (!get_packet_dst(&dst, &pckt, vip_info, is_ipv6, lru_map))
782 return XDP_DROP;
783 data_stats->v2 += 1;
784 }
785out:
786 cval = bpf_map_lookup_elem(&ctl_array, &mac_addr_pos);
787 if (!cval)
788 return XDP_DROP;
789 if (dst->flags & (1 << 0)) {
790 if (!encap_v6(xdp, cval, &pckt, dst, pkt_bytes))
791 return XDP_DROP;
792 } else {
793 if (!encap_v4(xdp, cval, &pckt, dst, pkt_bytes))
794 return XDP_DROP;
795 }
796 vip_num = vip_info->vip_num;
797 data_stats = bpf_map_lookup_elem(&stats, &vip_num);
798 if (!data_stats)
799 return XDP_DROP;
800 data_stats->v1 += 1;
801 data_stats->v2 += pkt_bytes;
802
803 data = (void *)(long)xdp->data;
804 data_end = (void *)(long)xdp->data_end;
805 if (data + 4 > data_end)
806 return XDP_DROP;
807 *(u32 *)data = dst->dst;
808 return XDP_DROP;
809}
810
811__attribute__ ((section("xdp-test"), used))
812int balancer_ingress(struct xdp_md *ctx)
813{
814 void *data = (void *)(long)ctx->data;
815 void *data_end = (void *)(long)ctx->data_end;
816 struct eth_hdr *eth = data;
817 __u32 eth_proto;
818 __u32 nh_off;
819
820 nh_off = sizeof(struct eth_hdr);
821 if (data + nh_off > data_end)
822 return XDP_DROP;
823 eth_proto = eth->eth_proto;
824 if (eth_proto == 8)
825 return process_packet(data, nh_off, data_end, 0, ctx);
826 else if (eth_proto == 56710)
827 return process_packet(data, nh_off, data_end, 1, ctx);
828 else
829 return XDP_DROP;
830}
831
832char _license[] __attribute__ ((section("license"), used)) = "GPL";
833int _version __attribute__ ((section("version"), used)) = 1;
834
