diff options
Diffstat (limited to 'tools/testing/selftests/bpf/test_xdp_noinline.c')
| -rw-r--r-- | tools/testing/selftests/bpf/test_xdp_noinline.c | 833 |
1 files changed, 833 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/test_xdp_noinline.c b/tools/testing/selftests/bpf/test_xdp_noinline.c new file mode 100644 index 000000000000..5e4aac74f9d0 --- /dev/null +++ b/tools/testing/selftests/bpf/test_xdp_noinline.c @@ -0,0 +1,833 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (c) 2017 Facebook +#include <stddef.h> +#include <stdbool.h> +#include <string.h> +#include <linux/pkt_cls.h> +#include <linux/bpf.h> +#include <linux/in.h> +#include <linux/if_ether.h> +#include <linux/ip.h> +#include <linux/ipv6.h> +#include <linux/icmp.h> +#include <linux/icmpv6.h> +#include <linux/tcp.h> +#include <linux/udp.h> +#include "bpf_helpers.h" + +#define bpf_printk(fmt, ...) \ +({ \ + char ____fmt[] = fmt; \ + bpf_trace_printk(____fmt, sizeof(____fmt), \ + ##__VA_ARGS__); \ +}) + +static __u32 rol32(__u32 word, unsigned int shift) +{ + return (word << shift) | (word >> ((-shift) & 31)); +} + +/* copy paste of jhash from kernel sources to make sure llvm + * can compile it into valid sequence of bpf instructions + */ +#define __jhash_mix(a, b, c) \ +{ \ + a -= c; a ^= rol32(c, 4); c += b; \ + b -= a; b ^= rol32(a, 6); a += c; \ + c -= b; c ^= rol32(b, 8); b += a; \ + a -= c; a ^= rol32(c, 16); c += b; \ + b -= a; b ^= rol32(a, 19); a += c; \ + c -= b; c ^= rol32(b, 4); b += a; \ +} + +#define __jhash_final(a, b, c) \ +{ \ + c ^= b; c -= rol32(b, 14); \ + a ^= c; a -= rol32(c, 11); \ + b ^= a; b -= rol32(a, 25); \ + c ^= b; c -= rol32(b, 16); \ + a ^= c; a -= rol32(c, 4); \ + b ^= a; b -= rol32(a, 14); \ + c ^= b; c -= rol32(b, 24); \ +} + +#define JHASH_INITVAL 0xdeadbeef + +typedef unsigned int u32; + +static __attribute__ ((noinline)) +u32 jhash(const void *key, u32 length, u32 initval) +{ + u32 a, b, c; + const unsigned char *k = key; + + a = b = c = JHASH_INITVAL + length + initval; + + while (length > 12) { + a += *(u32 *)(k); + b += *(u32 *)(k + 4); + c += *(u32 *)(k + 8); + __jhash_mix(a, b, c); + length -= 12; + k += 12; + } + switch (length) { + case 12: c += (u32)k[11]<<24; + case 11: c += (u32)k[10]<<16; + case 10: c += (u32)k[9]<<8; + case 9: c += k[8]; + case 8: b += (u32)k[7]<<24; + case 7: b += (u32)k[6]<<16; + case 6: b += (u32)k[5]<<8; + case 5: b += k[4]; + case 4: a += (u32)k[3]<<24; + case 3: a += (u32)k[2]<<16; + case 2: a += (u32)k[1]<<8; + case 1: a += k[0]; + __jhash_final(a, b, c); + case 0: /* Nothing left to add */ + break; + } + + return c; +} + +static __attribute__ ((noinline)) +u32 __jhash_nwords(u32 a, u32 b, u32 c, u32 initval) +{ + a += initval; + b += initval; + c += initval; + __jhash_final(a, b, c); + return c; +} + +static __attribute__ ((noinline)) +u32 jhash_2words(u32 a, u32 b, u32 initval) +{ + return __jhash_nwords(a, b, 0, initval + JHASH_INITVAL + (2 << 2)); +} + +struct flow_key { + union { + __be32 src; + __be32 srcv6[4]; + }; + union { + __be32 dst; + __be32 dstv6[4]; + }; + union { + __u32 ports; + __u16 port16[2]; + }; + __u8 proto; +}; + +struct packet_description { + struct flow_key flow; + __u8 flags; +}; + +struct ctl_value { + union { + __u64 value; + __u32 ifindex; + __u8 mac[6]; + }; +}; + +struct vip_definition { + union { + __be32 vip; + __be32 vipv6[4]; + }; + __u16 port; + __u16 family; + __u8 proto; +}; + +struct vip_meta { + __u32 flags; + __u32 vip_num; +}; + +struct real_pos_lru { + __u32 pos; + __u64 atime; +}; + +struct real_definition { + union { + __be32 dst; + __be32 dstv6[4]; + }; + __u8 flags; +}; + +struct lb_stats { + __u64 v2; + __u64 v1; +}; + +struct bpf_map_def __attribute__ ((section("maps"), used)) vip_map = { + .type = BPF_MAP_TYPE_HASH, + .key_size = sizeof(struct vip_definition), + .value_size = sizeof(struct vip_meta), + .max_entries = 512, + .map_flags = 0, +}; + +struct bpf_map_def __attribute__ ((section("maps"), used)) lru_cache = { + .type = BPF_MAP_TYPE_LRU_HASH, + .key_size = sizeof(struct flow_key), + .value_size = sizeof(struct real_pos_lru), + .max_entries = 300, + .map_flags = 1U << 1, +}; + +struct bpf_map_def __attribute__ ((section("maps"), used)) ch_rings = { + .type = BPF_MAP_TYPE_ARRAY, + .key_size = sizeof(__u32), + .value_size = sizeof(__u32), + .max_entries = 12 * 655, + .map_flags = 0, +}; + +struct bpf_map_def __attribute__ ((section("maps"), used)) reals = { + .type = BPF_MAP_TYPE_ARRAY, + .key_size = sizeof(__u32), + .value_size = sizeof(struct real_definition), + .max_entries = 40, + .map_flags = 0, +}; + +struct bpf_map_def __attribute__ ((section("maps"), used)) stats = { + .type = BPF_MAP_TYPE_PERCPU_ARRAY, + .key_size = sizeof(__u32), + .value_size = sizeof(struct lb_stats), + .max_entries = 515, + .map_flags = 0, +}; + +struct bpf_map_def __attribute__ ((section("maps"), used)) ctl_array = { + .type = BPF_MAP_TYPE_ARRAY, + .key_size = sizeof(__u32), + .value_size = sizeof(struct ctl_value), + .max_entries = 16, + .map_flags = 0, +}; + +struct eth_hdr { + unsigned char eth_dest[6]; + unsigned char eth_source[6]; + unsigned short eth_proto; +}; + +static inline __u64 calc_offset(bool is_ipv6, bool is_icmp) +{ + __u64 off = sizeof(struct eth_hdr); + if (is_ipv6) { + off += sizeof(struct ipv6hdr); + if (is_icmp) + off += sizeof(struct icmp6hdr) + sizeof(struct ipv6hdr); + } else { + off += sizeof(struct iphdr); + if (is_icmp) + off += sizeof(struct icmphdr) + sizeof(struct iphdr); + } + return off; +} + +static __attribute__ ((noinline)) +bool parse_udp(void *data, void *data_end, + bool is_ipv6, struct packet_description *pckt) +{ + + bool is_icmp = !((pckt->flags & (1 << 0)) == 0); + __u64 off = calc_offset(is_ipv6, is_icmp); + struct udphdr *udp; + udp = data + off; + + if (udp + 1 > data_end) + return 0; + if (!is_icmp) { + pckt->flow.port16[0] = udp->source; + pckt->flow.port16[1] = udp->dest; + } else { + pckt->flow.port16[0] = udp->dest; + pckt->flow.port16[1] = udp->source; + } + return 1; +} + +static __attribute__ ((noinline)) +bool parse_tcp(void *data, void *data_end, + bool is_ipv6, struct packet_description *pckt) +{ + + bool is_icmp = !((pckt->flags & (1 << 0)) == 0); + __u64 off = calc_offset(is_ipv6, is_icmp); + struct tcphdr *tcp; + + tcp = data + off; + if (tcp + 1 > data_end) + return 0; + if (tcp->syn) + pckt->flags |= (1 << 1); + if (!is_icmp) { + pckt->flow.port16[0] = tcp->source; + pckt->flow.port16[1] = tcp->dest; + } else { + pckt->flow.port16[0] = tcp->dest; + pckt->flow.port16[1] = tcp->source; + } + return 1; +} + +static __attribute__ ((noinline)) +bool encap_v6(struct xdp_md *xdp, struct ctl_value *cval, + struct packet_description *pckt, + struct real_definition *dst, __u32 pkt_bytes) +{ + struct eth_hdr *new_eth; + struct eth_hdr *old_eth; + struct ipv6hdr *ip6h; + __u32 ip_suffix; + void *data_end; + void *data; + + if (bpf_xdp_adjust_head(xdp, 0 - (int)sizeof(struct ipv6hdr))) + return 0; + data = (void *)(long)xdp->data; + data_end = (void *)(long)xdp->data_end; + new_eth = data; + ip6h = data + sizeof(struct eth_hdr); + old_eth = data + sizeof(struct ipv6hdr); + if (new_eth + 1 > data_end || + old_eth + 1 > data_end || ip6h + 1 > data_end) + return 0; + memcpy(new_eth->eth_dest, cval->mac, 6); + memcpy(new_eth->eth_source, old_eth->eth_dest, 6); + new_eth->eth_proto = 56710; + ip6h->version = 6; + ip6h->priority = 0; + memset(ip6h->flow_lbl, 0, sizeof(ip6h->flow_lbl)); + + ip6h->nexthdr = IPPROTO_IPV6; + ip_suffix = pckt->flow.srcv6[3] ^ pckt->flow.port16[0]; + ip6h->payload_len = + __builtin_bswap16(pkt_bytes + sizeof(struct ipv6hdr)); + ip6h->hop_limit = 4; + + ip6h->saddr.in6_u.u6_addr32[0] = 1; + ip6h->saddr.in6_u.u6_addr32[1] = 2; + ip6h->saddr.in6_u.u6_addr32[2] = 3; + ip6h->saddr.in6_u.u6_addr32[3] = ip_suffix; + memcpy(ip6h->daddr.in6_u.u6_addr32, dst->dstv6, 16); + return 1; +} + +static __attribute__ ((noinline)) +bool encap_v4(struct xdp_md *xdp, struct ctl_value *cval, + struct packet_description *pckt, + struct real_definition *dst, __u32 pkt_bytes) +{ + + __u32 ip_suffix = __builtin_bswap16(pckt->flow.port16[0]); + struct eth_hdr *new_eth; + struct eth_hdr *old_eth; + __u16 *next_iph_u16; + struct iphdr *iph; + __u32 csum = 0; + void *data_end; + void *data; + + ip_suffix <<= 15; + ip_suffix ^= pckt->flow.src; + if (bpf_xdp_adjust_head(xdp, 0 - (int)sizeof(struct iphdr))) + return 0; + data = (void *)(long)xdp->data; + data_end = (void *)(long)xdp->data_end; + new_eth = data; + iph = data + sizeof(struct eth_hdr); + old_eth = data + sizeof(struct iphdr); + if (new_eth + 1 > data_end || + old_eth + 1 > data_end || iph + 1 > data_end) + return 0; + memcpy(new_eth->eth_dest, cval->mac, 6); + memcpy(new_eth->eth_source, old_eth->eth_dest, 6); + new_eth->eth_proto = 8; + iph->version = 4; + iph->ihl = 5; + iph->frag_off = 0; + iph->protocol = IPPROTO_IPIP; + iph->check = 0; + iph->tos = 1; + iph->tot_len = __builtin_bswap16(pkt_bytes + sizeof(struct iphdr)); + /* don't update iph->daddr, since it will overwrite old eth_proto + * and multiple iterations of bpf_prog_run() will fail + */ + + iph->saddr = ((0xFFFF0000 & ip_suffix) | 4268) ^ dst->dst; + iph->ttl = 4; + + next_iph_u16 = (__u16 *) iph; +#pragma clang loop unroll(full) + for (int i = 0; i < sizeof(struct iphdr) >> 1; i++) + csum += *next_iph_u16++; + iph->check = ~((csum & 0xffff) + (csum >> 16)); + if (bpf_xdp_adjust_head(xdp, (int)sizeof(struct iphdr))) + return 0; + return 1; +} + +static __attribute__ ((noinline)) +bool decap_v6(struct xdp_md *xdp, void **data, void **data_end, bool inner_v4) +{ + struct eth_hdr *new_eth; + struct eth_hdr *old_eth; + + old_eth = *data; + new_eth = *data + sizeof(struct ipv6hdr); + memcpy(new_eth->eth_source, old_eth->eth_source, 6); + memcpy(new_eth->eth_dest, old_eth->eth_dest, 6); + if (inner_v4) + new_eth->eth_proto = 8; + else + new_eth->eth_proto = 56710; + if (bpf_xdp_adjust_head(xdp, (int)sizeof(struct ipv6hdr))) + return 0; + *data = (void *)(long)xdp->data; + *data_end = (void *)(long)xdp->data_end; + return 1; +} + +static __attribute__ ((noinline)) +bool decap_v4(struct xdp_md *xdp, void **data, void **data_end) +{ + struct eth_hdr *new_eth; + struct eth_hdr *old_eth; + + old_eth = *data; + new_eth = *data + sizeof(struct iphdr); + memcpy(new_eth->eth_source, old_eth->eth_source, 6); + memcpy(new_eth->eth_dest, old_eth->eth_dest, 6); + new_eth->eth_proto = 8; + if (bpf_xdp_adjust_head(xdp, (int)sizeof(struct iphdr))) + return 0; + *data = (void *)(long)xdp->data; + *data_end = (void *)(long)xdp->data_end; + return 1; +} + +static __attribute__ ((noinline)) +int swap_mac_and_send(void *data, void *data_end) +{ + unsigned char tmp_mac[6]; + struct eth_hdr *eth; + + eth = data; + memcpy(tmp_mac, eth->eth_source, 6); + memcpy(eth->eth_source, eth->eth_dest, 6); + memcpy(eth->eth_dest, tmp_mac, 6); + return XDP_TX; +} + +static __attribute__ ((noinline)) +int send_icmp_reply(void *data, void *data_end) +{ + struct icmphdr *icmp_hdr; + __u16 *next_iph_u16; + __u32 tmp_addr = 0; + struct iphdr *iph; + __u32 csum1 = 0; + __u32 csum = 0; + __u64 off = 0; + + if (data + sizeof(struct eth_hdr) + + sizeof(struct iphdr) + sizeof(struct icmphdr) > data_end) + return XDP_DROP; + off += sizeof(struct eth_hdr); + iph = data + off; + off += sizeof(struct iphdr); + icmp_hdr = data + off; + icmp_hdr->type = 0; + icmp_hdr->checksum += 0x0007; + iph->ttl = 4; + tmp_addr = iph->daddr; + iph->daddr = iph->saddr; + iph->saddr = tmp_addr; + iph->check = 0; + next_iph_u16 = (__u16 *) iph; +#pragma clang loop unroll(full) + for (int i = 0; i < sizeof(struct iphdr) >> 1; i++) + csum += *next_iph_u16++; + iph->check = ~((csum & 0xffff) + (csum >> 16)); + return swap_mac_and_send(data, data_end); +} + +static __attribute__ ((noinline)) +int send_icmp6_reply(void *data, void *data_end) +{ + struct icmp6hdr *icmp_hdr; + struct ipv6hdr *ip6h; + __be32 tmp_addr[4]; + __u64 off = 0; + + if (data + sizeof(struct eth_hdr) + + sizeof(struct ipv6hdr) + sizeof(struct icmp6hdr) > data_end) + return XDP_DROP; + off += sizeof(struct eth_hdr); + ip6h = data + off; + off += sizeof(struct ipv6hdr); + icmp_hdr = data + off; + icmp_hdr->icmp6_type = 129; + icmp_hdr->icmp6_cksum -= 0x0001; + ip6h->hop_limit = 4; + memcpy(tmp_addr, ip6h->saddr.in6_u.u6_addr32, 16); + memcpy(ip6h->saddr.in6_u.u6_addr32, ip6h->daddr.in6_u.u6_addr32, 16); + memcpy(ip6h->daddr.in6_u.u6_addr32, tmp_addr, 16); + return swap_mac_and_send(data, data_end); +} + +static __attribute__ ((noinline)) +int parse_icmpv6(void *data, void *data_end, __u64 off, + struct packet_description *pckt) +{ + struct icmp6hdr *icmp_hdr; + struct ipv6hdr *ip6h; + + icmp_hdr = data + off; + if (icmp_hdr + 1 > data_end) + return XDP_DROP; + if (icmp_hdr->icmp6_type == 128) + return send_icmp6_reply(data, data_end); + if (icmp_hdr->icmp6_type != 3) + return XDP_PASS; + off += sizeof(struct icmp6hdr); + ip6h = data + off; + if (ip6h + 1 > data_end) + return XDP_DROP; + pckt->flow.proto = ip6h->nexthdr; + pckt->flags |= (1 << 0); + memcpy(pckt->flow.srcv6, ip6h->daddr.in6_u.u6_addr32, 16); + memcpy(pckt->flow.dstv6, ip6h->saddr.in6_u.u6_addr32, 16); + return -1; +} + +static __attribute__ ((noinline)) +int parse_icmp(void *data, void *data_end, __u64 off, + struct packet_description *pckt) +{ + struct icmphdr *icmp_hdr; + struct iphdr *iph; + + icmp_hdr = data + off; + if (icmp_hdr + 1 > data_end) + return XDP_DROP; + if (icmp_hdr->type == 8) + return send_icmp_reply(data, data_end); + if ((icmp_hdr->type != 3) || (icmp_hdr->code != 4)) + return XDP_PASS; + off += sizeof(struct icmphdr); + iph = data + off; + if (iph + 1 > data_end) + return XDP_DROP; + if (iph->ihl != 5) + return XDP_DROP; + pckt->flow.proto = iph->protocol; + pckt->flags |= (1 << 0); + pckt->flow.src = iph->daddr; + pckt->flow.dst = iph->saddr; + return -1; +} + +static __attribute__ ((noinline)) +__u32 get_packet_hash(struct packet_description *pckt, + bool hash_16bytes) +{ + if (hash_16bytes) + return jhash_2words(jhash(pckt->flow.srcv6, 16, 12), + pckt->flow.ports, 24); + else + return jhash_2words(pckt->flow.src, pckt->flow.ports, + 24); +} + +__attribute__ ((noinline)) +static bool get_packet_dst(struct real_definition **real, + struct packet_description *pckt, + struct vip_meta *vip_info, + bool is_ipv6, void *lru_map) +{ + struct real_pos_lru new_dst_lru = { }; + bool hash_16bytes = is_ipv6; + __u32 *real_pos, hash, key; + __u64 cur_time; + + if (vip_info->flags & (1 << 2)) + hash_16bytes = 1; + if (vip_info->flags & (1 << 3)) { + pckt->flow.port16[0] = pckt->flow.port16[1]; + memset(pckt->flow.srcv6, 0, 16); + } + hash = get_packet_hash(pckt, hash_16bytes); + if (hash != 0x358459b7 /* jhash of ipv4 packet */ && + hash != 0x2f4bc6bb /* jhash of ipv6 packet */) + return 0; + key = 2 * vip_info->vip_num + hash % 2; + real_pos = bpf_map_lookup_elem(&ch_rings, &key); + if (!real_pos) + return 0; + key = *real_pos; + *real = bpf_map_lookup_elem(&reals, &key); + if (!(*real)) + return 0; + if (!(vip_info->flags & (1 << 1))) { + __u32 conn_rate_key = 512 + 2; + struct lb_stats *conn_rate_stats = + bpf_map_lookup_elem(&stats, &conn_rate_key); + + if (!conn_rate_stats) + return 1; + cur_time = bpf_ktime_get_ns(); + if ((cur_time - conn_rate_stats->v2) >> 32 > 0xffFFFF) { + conn_rate_stats->v1 = 1; + conn_rate_stats->v2 = cur_time; + } else { + conn_rate_stats->v1 += 1; + if (conn_rate_stats->v1 >= 1) + return 1; + } + if (pckt->flow.proto == IPPROTO_UDP) + new_dst_lru.atime = cur_time; + new_dst_lru.pos = key; + bpf_map_update_elem(lru_map, &pckt->flow, &new_dst_lru, 0); + } + return 1; +} + +__attribute__ ((noinline)) +static void connection_table_lookup(struct real_definition **real, + struct packet_description *pckt, + void *lru_map) +{ + + struct real_pos_lru *dst_lru; + __u64 cur_time; + __u32 key; + + dst_lru = bpf_map_lookup_elem(lru_map, &pckt->flow); + if (!dst_lru) + return; + if (pckt->flow.proto == IPPROTO_UDP) { + cur_time = bpf_ktime_get_ns(); + if (cur_time - dst_lru->atime > 300000) + return; + dst_lru->atime = cur_time; + } + key = dst_lru->pos; + *real = bpf_map_lookup_elem(&reals, &key); +} + +/* don't believe your eyes! + * below function has 6 arguments whereas bpf and llvm allow maximum of 5 + * but since it's _static_ llvm can optimize one argument away + */ +__attribute__ ((noinline)) +static int process_l3_headers_v6(struct packet_description *pckt, + __u8 *protocol, __u64 off, + __u16 *pkt_bytes, void *data, + void *data_end) +{ + struct ipv6hdr *ip6h; + __u64 iph_len; + int action; + + ip6h = data + off; + if (ip6h + 1 > data_end) + return XDP_DROP; + iph_len = sizeof(struct ipv6hdr); + *protocol = ip6h->nexthdr; + pckt->flow.proto = *protocol; + *pkt_bytes = __builtin_bswap16(ip6h->payload_len); + off += iph_len; + if (*protocol == 45) { + return XDP_DROP; + } else if (*protocol == 59) { + action = parse_icmpv6(data, data_end, off, pckt); + if (action >= 0) + return action; + } else { + memcpy(pckt->flow.srcv6, ip6h->saddr.in6_u.u6_addr32, 16); + memcpy(pckt->flow.dstv6, ip6h->daddr.in6_u.u6_addr32, 16); + } + return -1; +} + +__attribute__ ((noinline)) +static int process_l3_headers_v4(struct packet_description *pckt, + __u8 *protocol, __u64 off, + __u16 *pkt_bytes, void *data, + void *data_end) +{ + struct iphdr *iph; + __u64 iph_len; + int action; + + iph = data + off; + if (iph + 1 > data_end) + return XDP_DROP; + if (iph->ihl != 5) + return XDP_DROP; + *protocol = iph->protocol; + pckt->flow.proto = *protocol; + *pkt_bytes = __builtin_bswap16(iph->tot_len); + off += 20; + if (iph->frag_off & 65343) + return XDP_DROP; + if (*protocol == IPPROTO_ICMP) { + action = parse_icmp(data, data_end, off, pckt); + if (action >= 0) + return action; + } else { + pckt->flow.src = iph->saddr; + pckt->flow.dst = iph->daddr; + } + return -1; +} + +__attribute__ ((noinline)) +static int process_packet(void *data, __u64 off, void *data_end, + bool is_ipv6, struct xdp_md *xdp) +{ + + struct real_definition *dst = NULL; + struct packet_description pckt = { }; + struct vip_definition vip = { }; + struct lb_stats *data_stats; + struct eth_hdr *eth = data; + void *lru_map = &lru_cache; + struct vip_meta *vip_info; + __u32 lru_stats_key = 513; + __u32 mac_addr_pos = 0; + __u32 stats_key = 512; + struct ctl_value *cval; + __u16 pkt_bytes; + __u64 iph_len; + __u8 protocol; + __u32 vip_num; + int action; + + if (is_ipv6) + action = process_l3_headers_v6(&pckt, &protocol, off, + &pkt_bytes, data, data_end); + else + action = process_l3_headers_v4(&pckt, &protocol, off, + &pkt_bytes, data, data_end); + if (action >= 0) + return action; + protocol = pckt.flow.proto; + if (protocol == IPPROTO_TCP) { + if (!parse_tcp(data, data_end, is_ipv6, &pckt)) + return XDP_DROP; + } else if (protocol == IPPROTO_UDP) { + if (!parse_udp(data, data_end, is_ipv6, &pckt)) + return XDP_DROP; + } else { + return XDP_TX; + } + + if (is_ipv6) + memcpy(vip.vipv6, pckt.flow.dstv6, 16); + else + vip.vip = pckt.flow.dst; + vip.port = pckt.flow.port16[1]; + vip.proto = pckt.flow.proto; + vip_info = bpf_map_lookup_elem(&vip_map, &vip); + if (!vip_info) { + vip.port = 0; + vip_info = bpf_map_lookup_elem(&vip_map, &vip); + if (!vip_info) + return XDP_PASS; + if (!(vip_info->flags & (1 << 4))) + pckt.flow.port16[1] = 0; + } + if (data_end - data > 1400) + return XDP_DROP; + data_stats = bpf_map_lookup_elem(&stats, &stats_key); + if (!data_stats) + return XDP_DROP; + data_stats->v1 += 1; + if (!dst) { + if (vip_info->flags & (1 << 0)) + pckt.flow.port16[0] = 0; + if (!(pckt.flags & (1 << 1)) && !(vip_info->flags & (1 << 1))) + connection_table_lookup(&dst, &pckt, lru_map); + if (dst) + goto out; + if (pckt.flow.proto == IPPROTO_TCP) { + struct lb_stats *lru_stats = + bpf_map_lookup_elem(&stats, &lru_stats_key); + + if (!lru_stats) + return XDP_DROP; + if (pckt.flags & (1 << 1)) + lru_stats->v1 += 1; + else + lru_stats->v2 += 1; + } + if (!get_packet_dst(&dst, &pckt, vip_info, is_ipv6, lru_map)) + return XDP_DROP; + data_stats->v2 += 1; + } +out: + cval = bpf_map_lookup_elem(&ctl_array, &mac_addr_pos); + if (!cval) + return XDP_DROP; + if (dst->flags & (1 << 0)) { + if (!encap_v6(xdp, cval, &pckt, dst, pkt_bytes)) + return XDP_DROP; + } else { + if (!encap_v4(xdp, cval, &pckt, dst, pkt_bytes)) + return XDP_DROP; + } + vip_num = vip_info->vip_num; + data_stats = bpf_map_lookup_elem(&stats, &vip_num); + if (!data_stats) + return XDP_DROP; + data_stats->v1 += 1; + data_stats->v2 += pkt_bytes; + + data = (void *)(long)xdp->data; + data_end = (void *)(long)xdp->data_end; + if (data + 4 > data_end) + return XDP_DROP; + *(u32 *)data = dst->dst; + return XDP_DROP; +} + +__attribute__ ((section("xdp-test"), used)) +int balancer_ingress(struct xdp_md *ctx) +{ + void *data = (void *)(long)ctx->data; + void *data_end = (void *)(long)ctx->data_end; + struct eth_hdr *eth = data; + __u32 eth_proto; + __u32 nh_off; + + nh_off = sizeof(struct eth_hdr); + if (data + nh_off > data_end) + return XDP_DROP; + eth_proto = eth->eth_proto; + if (eth_proto == 8) + return process_packet(data, nh_off, data_end, 0, ctx); + else if (eth_proto == 56710) + return process_packet(data, nh_off, data_end, 1, ctx); + else + return XDP_DROP; +} + +char _license[] __attribute__ ((section("license"), used)) = "GPL"; +int _version __attribute__ ((section("version"), used)) = 1; |