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xdp_acl.c
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xdp_acl.c
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// +build ignore
#include <linux/types.h>
#include <linux/byteorder.h>
// #include <linux/rcupdate.h>
// <linux/rcupdate.h>
#include <stddef.h>
#include <linux/in.h> // proto type
#include <linux/if_ether.h> // l2
#include <linux/ip.h> // l3
#include <linux/tcp.h> // l4 struct tcphdr
#include <linux/udp.h> // l4 struct udphdr
#include <linux/icmp.h> // l4 备用
// #include <linux/if_packet.h>
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_endian.h>
// #define XDPACL_DEBUG
#define BITMAP_ARRAY_SIZE 160
/*
about BITMAP_ARRAY_SIZE
240 (15360) also ok; 288(18432; unroll 最大 36) is ok;
320 (20480) ok (需要全部展开)
必须是 8 的整数倍
*/
#ifndef IPPROTO_OSPF
#define IPPROTO_OSPF 89
#endif
// cacheline alignment
#ifndef L1_CACHE_BYTES
#define L1_CACHE_BYTES 64
#endif
#ifndef SMP_CACHE_BYTES
#define SMP_CACHE_BYTES L1_CACHE_BYTES
#endif
#ifndef ____cacheline_aligned
#define ____cacheline_aligned __attribute__((__aligned__(SMP_CACHE_BYTES)))
#endif
// likely optimization
#define likely(x) __builtin_expect(!!(x), 1)
#define unlikely(x) __builtin_expect(!!(x), 0)
// FIXED value
// #define ETH_HDR_SIZE 14
// #define IP_HDR_SIZE 20
// #define TCP_HDR_SIZE 20
// #define UDP_HDR_SIZE 8
// 支持的最多规则条数, 必须是 64 的整数倍; 比如: 64 * 16 == 1024
#define RULE_NUM_MAX_ENTRIES_V4 64 * BITMAP_ARRAY_SIZE
#define IP_MAX_ENTRIES_V4 RULE_NUM_MAX_ENTRIES_V4
// 支持的最多端口个数 1~65535; 65536 == 2^16
#define PORT_MAX_ENTRIES_V4 65536
// 支持的最多协议类型数 tcp udp icmp
#define PROTO_MAX_ENTRIES_V4 4
// 支持的规则数 编号
#define RULE_ACTION_MAX_ENTRIES_V4 RULE_NUM_MAX_ENTRIES_V4
#define LPM_PREFIXLEN_IPv4 32
struct lpm_key_ipv4
{
__u32 prefixlen; /* up to 32 for AF_INET, 128 for AF_INET6 */
__u8 data[4]; /* Arbitrary size */
} __attribute__((aligned(4)));
// v4 v6 可共用
__u64 bitmap[BITMAP_ARRAY_SIZE];
// v4 v6 可共用此结构体
struct rule_action
{
__u64 action;
__u64 count;
};
// v4 v6 可共用此结构体
struct rule_action_key
{
__u64 bitmap_ffs;
__u64 bitmap_array_index;
};
struct bpf_map_def SEC("maps") src_v4 = {
.type = BPF_MAP_TYPE_LPM_TRIE,
.key_size = sizeof(struct lpm_key_ipv4), // 8 byte: mask len; 8 byte: host byte oreder
.value_size = sizeof(bitmap),
.max_entries = IP_MAX_ENTRIES_V4,
.map_flags = BPF_F_NO_PREALLOC,
};
struct bpf_map_def SEC("maps") sport_v4 = {
.type = BPF_MAP_TYPE_HASH,
.key_size = sizeof(__u16), // 2 byte; net byte oreder
.value_size = sizeof(bitmap),
.max_entries = PORT_MAX_ENTRIES_V4,
};
struct bpf_map_def SEC("maps") dst_v4 = {
.type = BPF_MAP_TYPE_LPM_TRIE,
.key_size = sizeof(struct lpm_key_ipv4), // 8 byte: mask len; 8 byte; host byte oreder
.value_size = sizeof(bitmap),
.max_entries = IP_MAX_ENTRIES_V4,
.map_flags = BPF_F_NO_PREALLOC,
};
struct bpf_map_def SEC("maps") dport_v4 = {
.type = BPF_MAP_TYPE_HASH,
.key_size = sizeof(__u16), // 2 byte; net byte oreder
.value_size = sizeof(bitmap),
.max_entries = PORT_MAX_ENTRIES_V4,
};
struct bpf_map_def SEC("maps") proto_v4 = {
.type = BPF_MAP_TYPE_HASH,
.key_size = sizeof(__u32), // 4 byte; host byte oreder
.value_size = sizeof(bitmap),
.max_entries = PROTO_MAX_ENTRIES_V4,
};
struct bpf_map_def SEC("maps") rule_action_v4 = {
.type = BPF_MAP_TYPE_PERCPU_HASH,
.key_size = sizeof(struct rule_action_key),
.value_size = sizeof(struct rule_action),
.max_entries = RULE_ACTION_MAX_ENTRIES_V4,
};
struct hdr_cursor
{
void *pos;
};
static __always_inline int parse_ethhdr(struct hdr_cursor *nh, void *data_end,
struct ethhdr **ethhdr_l2)
{
*ethhdr_l2 = nh->pos;
// Byte-count bounds check; check if current pointer + size of header is after data_end.
if ((void *)((*ethhdr_l2) + 1) > data_end)
{
return -1;
}
nh->pos += sizeof(struct ethhdr);
return (*ethhdr_l2)->h_proto; // network-byte-order
}
static __always_inline int parse_iphdr(struct hdr_cursor *nh,
void *data_end,
struct iphdr **iphdr_l3)
{
*iphdr_l3 = nh->pos;
if ((void *)((*iphdr_l3) + 1) > data_end)
{
return -1;
}
int hdrsize = ((*iphdr_l3)->ihl) << 2; // * 4
// Sanity check packet field is valid
if (hdrsize < sizeof(struct iphdr))
{
return -1;
}
// Variable-length IPv4 header, need to use byte-based arithmetic
nh->pos += hdrsize;
if (nh->pos > data_end)
{
return -1;
}
return (*iphdr_l3)->protocol;
}
// parse and return the length of the tcp header
static __always_inline int parse_tcphdr(struct hdr_cursor *nh,
void *data_end,
struct tcphdr **tcphdr_l4)
{
*tcphdr_l4 = nh->pos;
if ((void *)((*tcphdr_l4) + 1) > data_end)
{
return -1;
}
int len = ((*tcphdr_l4)->doff) << 2; // * 4
// Sanity check packet field is valid
if (len < sizeof(struct tcphdr))
{
return -1;
}
// Variable-length TCP header, need to use byte-based arithmetic
nh->pos += len;
if (nh->pos > data_end)
{
return -1;
}
return len;
}
// parse the udp header and return the length of the udp payload
static __always_inline int parse_udphdr(struct hdr_cursor *nh,
void *data_end,
struct udphdr **udphdr_l4)
{
*udphdr_l4 = nh->pos;
if ((void *)((*udphdr_l4) + 1) > data_end)
{
return -1;
}
nh->pos += sizeof(struct udphdr);
int len = bpf_ntohs((*udphdr_l4)->len) - sizeof(struct udphdr);
if (len < 0)
{
return -1;
}
return len;
}
static __always_inline void get_lpm_prefix_data_v4(__u32 addr, struct lpm_key_ipv4 *lpm_key_v4)
{
lpm_key_v4->data[0] = addr & 0xff; // bpf_ntohl(iphdr_l3->saddr);
lpm_key_v4->data[1] = (addr >> 8) & 0xff;
lpm_key_v4->data[2] = (addr >> 16) & 0xff;
lpm_key_v4->data[3] = (addr >> 24) & 0xff;
}
static __always_inline void get_bitmap_array_for_tcp_v4(__u64 *rule_array[], __u32 *rule_array_len, int *proto_type, struct iphdr *iphdr_l3, struct tcphdr *tcphdr_l4)
{
struct lpm_key_ipv4 lpm_key_v4;
__u64 *bitmap = NULL;
// addr src
lpm_key_v4.prefixlen = LPM_PREFIXLEN_IPv4;
get_lpm_prefix_data_v4(iphdr_l3->saddr, &lpm_key_v4);
bitmap = bpf_map_lookup_elem(&src_v4, &lpm_key_v4);
if (NULL != bitmap)
{
#ifdef XDPACL_DEBUG
char msg1[] = "hit addr src: %u\n";
bpf_trace_printk(msg1, sizeof(msg1), bpf_ntohl(iphdr_l3->saddr));
#endif
rule_array[(*rule_array_len)++] = bitmap;
}
// addr dst
get_lpm_prefix_data_v4(iphdr_l3->daddr, &lpm_key_v4);
bitmap = bpf_map_lookup_elem(&dst_v4, &lpm_key_v4);
if (NULL != bitmap)
{
#ifdef XDPACL_DEBUG
char msg1[] = "hit addr dst: %u\n";
bpf_trace_printk(msg1, sizeof(msg1), bpf_ntohl(iphdr_l3->daddr));
#endif
rule_array[(*rule_array_len)++] = bitmap;
}
// port src
__u16 port = tcphdr_l4->source; // bpf_ntohs(tcphdr_l4->source);
bitmap = bpf_map_lookup_elem(&sport_v4, &port);
if (NULL != bitmap)
{
#ifdef XDPACL_DEBUG
char msg1[] = "hit port src: %u; bitmap[0]: %llu\n";
bpf_trace_printk(msg1, sizeof(msg1), bpf_ntohs(tcphdr_l4->source), bitmap[0]);
#endif
rule_array[(*rule_array_len)++] = bitmap;
}
// port dst bpf_ntohs(tcphdr_l4->dest);
port = tcphdr_l4->dest;
#ifdef XDPACL_DEBUG
char msg1[] = "port dst h-order: %u; n-order: %u\n";
bpf_trace_printk(msg1, sizeof(msg1), bpf_ntohs(tcphdr_l4->dest), tcphdr_l4->dest);
#endif
bitmap = bpf_map_lookup_elem(&dport_v4, &port);
if (NULL != bitmap)
{
#ifdef XDPACL_DEBUG
char msg1[] = "hit port dst: %u; bitmap[7]: %llu\n";
bpf_trace_printk(msg1, sizeof(msg1), bpf_ntohs(tcphdr_l4->dest), bitmap[7]);
#endif
rule_array[(*rule_array_len)++] = bitmap;
}
// proto
bitmap = bpf_map_lookup_elem(&proto_v4, proto_type);
if (NULL != bitmap)
{
#ifdef XDPACL_DEBUG
char msg1[] = "hit tcp\n";
bpf_trace_printk(msg1, sizeof(msg1));
#endif
rule_array[(*rule_array_len)++] = bitmap;
}
}
static __always_inline void get_bitmap_array_for_udp_v4(__u64 *rule_array[], __u32 *rule_array_len, int *proto_type, struct iphdr *iphdr_l3, struct udphdr *udphdr_l4)
{
struct lpm_key_ipv4 lpm_key_v4;
__u64 *bitmap;
// addr src
lpm_key_v4.prefixlen = LPM_PREFIXLEN_IPv4;
get_lpm_prefix_data_v4(iphdr_l3->saddr, &lpm_key_v4);
bitmap = bpf_map_lookup_elem(&src_v4, &lpm_key_v4);
if (NULL != bitmap)
{
#ifdef XDPACL_DEBUG
char msg1[] = "hit addr src: %u\n";
bpf_trace_printk(msg1, sizeof(msg1), bpf_ntohl(iphdr_l3->saddr));
#endif
rule_array[(*rule_array_len)++] = bitmap;
}
// addr dst
get_lpm_prefix_data_v4(iphdr_l3->daddr, &lpm_key_v4);
bitmap = bpf_map_lookup_elem(&dst_v4, &lpm_key_v4);
if (NULL != bitmap)
{
#ifdef XDPACL_DEBUG
char msg1[] = "hit addr dst: %u\n";
bpf_trace_printk(msg1, sizeof(msg1), bpf_ntohl(iphdr_l3->daddr));
#endif
rule_array[(*rule_array_len)++] = bitmap;
}
// port src
__u16 port = udphdr_l4->source; // bpf_ntohs(udphdr_l4->source);
bitmap = bpf_map_lookup_elem(&sport_v4, &port);
if (NULL != bitmap)
{
#ifdef XDPACL_DEBUG
char msg1[] = "hit port src: %u\n";
bpf_trace_printk(msg1, sizeof(msg1), bpf_ntohs(udphdr_l4->source));
#endif
rule_array[(*rule_array_len)++] = bitmap;
}
// port dst
port = udphdr_l4->dest; // bpf_ntohs(udphdr_l4->dest);
bitmap = bpf_map_lookup_elem(&dport_v4, &port);
if (NULL != bitmap)
{
#ifdef XDPACL_DEBUG
char msg1[] = "hit port dst: %u\n";
bpf_trace_printk(msg1, sizeof(msg1), bpf_ntohs(udphdr_l4->dest));
#endif
rule_array[(*rule_array_len)++] = bitmap;
}
// proto
bitmap = bpf_map_lookup_elem(&proto_v4, proto_type);
if (NULL != bitmap)
{
#ifdef XDPACL_DEBUG
char msg1[] = "hit udp\n";
bpf_trace_printk(msg1, sizeof(msg1));
#endif
rule_array[(*rule_array_len)++] = bitmap;
}
}
static __always_inline void get_bitmap_array_for_icmp_v4(__u64 *rule_array[], __u32 *rule_array_len, int *proto_type, struct iphdr *iphdr_l3)
{
struct lpm_key_ipv4 lpm_key_v4;
__u64 *bitmap;
// addr src
lpm_key_v4.prefixlen = LPM_PREFIXLEN_IPv4;
get_lpm_prefix_data_v4(iphdr_l3->saddr, &lpm_key_v4);
bitmap = bpf_map_lookup_elem(&src_v4, &lpm_key_v4);
if (NULL != bitmap)
{
#ifdef XDPACL_DEBUG
char msg1[] = "hit addr src: %u\n";
bpf_trace_printk(msg1, sizeof(msg1), bpf_ntohl(iphdr_l3->saddr));
#endif
rule_array[(*rule_array_len)++] = bitmap;
}
// addr dst
get_lpm_prefix_data_v4(iphdr_l3->daddr, &lpm_key_v4);
bitmap = bpf_map_lookup_elem(&dst_v4, &lpm_key_v4);
if (NULL != bitmap)
{
#ifdef XDPACL_DEBUG
char msg1[] = "hit addr dst: %u\n";
bpf_trace_printk(msg1, sizeof(msg1), bpf_ntohl(iphdr_l3->daddr));
#endif
rule_array[(*rule_array_len)++] = bitmap;
}
// proto
bitmap = bpf_map_lookup_elem(&proto_v4, proto_type);
if (NULL != bitmap)
{
#ifdef XDPACL_DEBUG
char msg1[] = "hit icmp\n";
bpf_trace_printk(msg1, sizeof(msg1));
#endif
rule_array[(*rule_array_len)++] = bitmap;
}
}
static __always_inline void get_hit_rules_optimize(__u64 *rule_array[], __u32 *rule_array_len_ptr, __u64 *rule_array_index_ptr, __u64 *hit_rules_ptr)
{
if (5 == *rule_array_len_ptr)
{
// 5
*hit_rules_ptr = (rule_array[0][*rule_array_index_ptr]) & (rule_array[1][*rule_array_index_ptr]) & (rule_array[2][*rule_array_index_ptr]) & (rule_array[3][*rule_array_index_ptr]) & (rule_array[4][*rule_array_index_ptr]);
if (*hit_rules_ptr > 0)
{
return;
}
(*rule_array_index_ptr)++;
*hit_rules_ptr = (rule_array[0][*rule_array_index_ptr]) & (rule_array[1][*rule_array_index_ptr]) & (rule_array[2][*rule_array_index_ptr]) & (rule_array[3][*rule_array_index_ptr]) & (rule_array[4][*rule_array_index_ptr]);
if (*hit_rules_ptr > 0)
{
return;
}
(*rule_array_index_ptr)++;
*hit_rules_ptr = (rule_array[0][*rule_array_index_ptr]) & (rule_array[1][*rule_array_index_ptr]) & (rule_array[2][*rule_array_index_ptr]) & (rule_array[3][*rule_array_index_ptr]) & (rule_array[4][*rule_array_index_ptr]);
if (*hit_rules_ptr > 0)
{
return;
}
(*rule_array_index_ptr)++;
*hit_rules_ptr = (rule_array[0][*rule_array_index_ptr]) & (rule_array[1][*rule_array_index_ptr]) & (rule_array[2][*rule_array_index_ptr]) & (rule_array[3][*rule_array_index_ptr]) & (rule_array[4][*rule_array_index_ptr]);
if (*hit_rules_ptr > 0)
{
return;
}
(*rule_array_index_ptr)++;
*hit_rules_ptr = (rule_array[0][*rule_array_index_ptr]) & (rule_array[1][*rule_array_index_ptr]) & (rule_array[2][*rule_array_index_ptr]) & (rule_array[3][*rule_array_index_ptr]) & (rule_array[4][*rule_array_index_ptr]);
if (*hit_rules_ptr > 0)
{
return;
}
(*rule_array_index_ptr)++;
*hit_rules_ptr = (rule_array[0][*rule_array_index_ptr]) & (rule_array[1][*rule_array_index_ptr]) & (rule_array[2][*rule_array_index_ptr]) & (rule_array[3][*rule_array_index_ptr]) & (rule_array[4][*rule_array_index_ptr]);
if (*hit_rules_ptr > 0)
{
return;
}
(*rule_array_index_ptr)++;
*hit_rules_ptr = (rule_array[0][*rule_array_index_ptr]) & (rule_array[1][*rule_array_index_ptr]) & (rule_array[2][*rule_array_index_ptr]) & (rule_array[3][*rule_array_index_ptr]) & (rule_array[4][*rule_array_index_ptr]);
if (*hit_rules_ptr > 0)
{
return;
}
(*rule_array_index_ptr)++;
*hit_rules_ptr = (rule_array[0][*rule_array_index_ptr]) & (rule_array[1][*rule_array_index_ptr]) & (rule_array[2][*rule_array_index_ptr]) & (rule_array[3][*rule_array_index_ptr]) & (rule_array[4][*rule_array_index_ptr]);
if (*hit_rules_ptr > 0)
{
return;
}
}
else
{
// 3
*hit_rules_ptr = (rule_array[0][*rule_array_index_ptr]) & (rule_array[1][*rule_array_index_ptr]) & (rule_array[2][*rule_array_index_ptr]);
if (*hit_rules_ptr > 0)
{
return;
}
(*rule_array_index_ptr)++;
*hit_rules_ptr = (rule_array[0][*rule_array_index_ptr]) & (rule_array[1][*rule_array_index_ptr]) & (rule_array[2][*rule_array_index_ptr]);
if (*hit_rules_ptr > 0)
{
return;
}
(*rule_array_index_ptr)++;
*hit_rules_ptr = (rule_array[0][*rule_array_index_ptr]) & (rule_array[1][*rule_array_index_ptr]) & (rule_array[2][*rule_array_index_ptr]);
if (*hit_rules_ptr > 0)
{
return;
}
(*rule_array_index_ptr)++;
*hit_rules_ptr = (rule_array[0][*rule_array_index_ptr]) & (rule_array[1][*rule_array_index_ptr]) & (rule_array[2][*rule_array_index_ptr]);
if (*hit_rules_ptr > 0)
{
return;
}
(*rule_array_index_ptr)++;
*hit_rules_ptr = (rule_array[0][*rule_array_index_ptr]) & (rule_array[1][*rule_array_index_ptr]) & (rule_array[2][*rule_array_index_ptr]);
if (*hit_rules_ptr > 0)
{
return;
}
(*rule_array_index_ptr)++;
*hit_rules_ptr = (rule_array[0][*rule_array_index_ptr]) & (rule_array[1][*rule_array_index_ptr]) & (rule_array[2][*rule_array_index_ptr]);
if (*hit_rules_ptr > 0)
{
return;
}
(*rule_array_index_ptr)++;
*hit_rules_ptr = (rule_array[0][*rule_array_index_ptr]) & (rule_array[1][*rule_array_index_ptr]) & (rule_array[2][*rule_array_index_ptr]);
if (*hit_rules_ptr > 0)
{
return;
}
(*rule_array_index_ptr)++;
*hit_rules_ptr = (rule_array[0][*rule_array_index_ptr]) & (rule_array[1][*rule_array_index_ptr]) & (rule_array[2][*rule_array_index_ptr]);
if (*hit_rules_ptr > 0)
{
return;
}
}
return;
}
static __always_inline int get_rule_action_v4(__u64 *rule_array[], __u32 *rule_array_len_ptr)
{
/*
三种特殊情况:
未匹配到规则:
1 *rule_array_len == 0 => (bitmap[0] == 0); 或者 *rule_array_len == 1 2 4 返回 XDP_PASS;
2 *rule_array_len != 0; 但 bitmap 按位与时，都为 0 => (bitmap[BITMAP_ARRAY_SIZE - 1] == 0); 返回 XDP_PASS
匹配到规则:
3 未找到 action
*/
struct rule_action_key key;
struct rule_action *value;
if (unlikely(3 != *rule_array_len_ptr && 5 != *rule_array_len_ptr))
{
// 特殊情况 1
// key.bitmap_ffs = 0;
// key.bitmap_array_index = 0;
#ifdef XDPACL_DEBUG
char msg3[] = "result => rule action: specified 1\n";
bpf_trace_printk(msg3, sizeof(msg3));
#endif
// value = bpf_map_lookup_elem(&rule_action_v4, &key);
// if (NULL != value)
// {
// (value->count)++;
// return value->action;
// }
return XDP_PASS;
}
__u64 rule_array_index ____cacheline_aligned = 0;
__u64 hit_rules ____cacheline_aligned = 0;
// #pragma unroll
// for (; rule_array_index < BITMAP_ARRAY_SIZE; rule_array_index++)
// {
// get_hit_rules(rule_array, rule_array_len_ptr, &rule_array_index, &hit_rules);
// // #ifdef XDPACL_DEBUG
// // char msg3[] = "hit_rules: %llu; rule_array_inx: %llu\n";
// // bpf_trace_printk(msg3, sizeof(msg3), hit_rules, rule_array_index);
// // #endif
// if (hit_rules > 0)
// {
// break;
// }
// }
__u64 rule_array_outer_index ____cacheline_aligned = 0;
#pragma unroll
for (; rule_array_outer_index < BITMAP_ARRAY_SIZE; rule_array_outer_index += 8)
{
get_hit_rules_optimize(rule_array, rule_array_len_ptr, &rule_array_index, &hit_rules);
if (hit_rules > 0)
{
break;
}
rule_array_index++;
}
#ifdef XDPACL_DEBUG
char msg13[] = "result => rule_array.size = %lu; rule_array_index: %llu; hit_rules: %llu;\n";
bpf_trace_printk(msg13, sizeof(msg13), *rule_array_len_ptr, rule_array_index, hit_rules);
#endif
if (rule_array_index >= BITMAP_ARRAY_SIZE)
{
// 特殊情况 2
#ifdef XDPACL_DEBUG
char msg3[] = "result => hit bitmap[%d]: %llu; specified 2; \n";
bpf_trace_printk(msg3, sizeof(msg3), rule_array_index, hit_rules);
#endif
return XDP_PASS;
}
key.bitmap_ffs = hit_rules & (-hit_rules);
key.bitmap_array_index = rule_array_index;
value = bpf_map_lookup_elem(&rule_action_v4, &key);
if (NULL != value)
{
#ifdef XDPACL_DEBUG
char msg3[] = "result => hit bitmap[%d]: %llu; ffs: %llu; normal\n";
bpf_trace_printk(msg3, sizeof(msg3), rule_array_index, hit_rules, key.bitmap_ffs);
char msg4[] = "hit bitmap[%d]: ffs: %llu; action: %d\n";
bpf_trace_printk(msg4, sizeof(msg4), rule_array_index, key.bitmap_ffs, value->action);
#endif
(value->count)++;
return value->action;
}
// 特殊情况 3，现在默认为 XDP_PASS
#ifdef XDPACL_DEBUG
char msg2[] = "result => hit bitmap[%d]: %llu; ffs: %llu; rule action: specified 3\n";
bpf_trace_printk(msg2, sizeof(msg2), rule_array_index, hit_rules, key.bitmap_ffs);
#endif
return XDP_PASS;
}
SEC("xdp_acl")
int xdp_acl_func(struct xdp_md *ctx)
{
#ifdef XDPACL_DEBUG
char msg1[] = "\n\nreceive new frame, ingress_ifindex: %u; rx_queue_index: %u\n";
bpf_trace_printk(msg1, sizeof(msg1), ctx->ingress_ifindex, ctx->rx_queue_index);
#endif
void *data_end = (void *)(long)ctx->data_end;
void *data = (void *)(long)ctx->data;
struct hdr_cursor nh = {.pos = data};
int proto_type;
struct ethhdr *ethhdr_l2;
proto_type = parse_ethhdr(&nh, data_end, ðhdr_l2);
if (bpf_htons(ETH_P_IP) == proto_type)
{
// IPv4
__u64 *rule_array[5];
__u32 rule_array_len = 0;
struct iphdr *iphdr_l3;
proto_type = parse_iphdr(&nh, data_end, &iphdr_l3);
if (likely(IPPROTO_TCP == proto_type))
{
#ifdef XDPACL_DEBUG
char msg1[] = "receive TCP pkt\n";
bpf_trace_printk(msg1, sizeof(msg1));
#endif
struct tcphdr *tcphdr_l4;
if (parse_tcphdr(&nh, data_end, &tcphdr_l4) < 0)
{
#ifdef XDPACL_DEBUG
char msg1[] = "\ndrop TCP pkt\n";
bpf_trace_printk(msg1, sizeof(msg1));
#endif
return XDP_DROP;
}
get_bitmap_array_for_tcp_v4(rule_array, &rule_array_len, &proto_type, iphdr_l3, tcphdr_l4);
}
else if (IPPROTO_UDP == proto_type)
{
#ifdef XDPACL_DEBUG
char msg1[] = "receive UDP pkt\n";
bpf_trace_printk(msg1, sizeof(msg1));
#endif
struct udphdr *udphdr_l4;
if (parse_udphdr(&nh, data_end, &udphdr_l4) < 0)
{
return XDP_DROP;
}
get_bitmap_array_for_udp_v4(rule_array, &rule_array_len, &proto_type, iphdr_l3, udphdr_l4);
}
else if (IPPROTO_ICMP == proto_type)
{
#ifdef XDPACL_DEBUG
char msg1[] = "receive ICMP pkt\n";
bpf_trace_printk(msg1, sizeof(msg1));
#endif
get_bitmap_array_for_icmp_v4(rule_array, &rule_array_len, &proto_type, iphdr_l3);
}
else
{
// IPPROTO_GRE IPPROTO_OSPF...
#ifdef XDPACL_DEBUG
char msg1[] = "\n\nreceive Unknown IP pkt\n";
bpf_trace_printk(msg1, sizeof(msg1));
#endif
return XDP_PASS;
}
return get_rule_action_v4(rule_array, &rule_array_len);
}
else if (proto_type > 0)
{
#ifdef XDPACL_DEBUG
char msg1[] = "\nreceive Not IP frame\n";
bpf_trace_printk(msg1, sizeof(msg1));
#endif
// contain ETH_P_IPV6 ETH_P_ARP
return XDP_PASS;
}
else
{
#ifdef XDPACL_DEBUG
char msg1[] = "\ndrop eth frame\n";
bpf_trace_printk(msg1, sizeof(msg1));
#endif
return XDP_DROP;
}
}
char _license[] SEC("license") = "GPL";
// with optimization max len 5
/*
static __always_inline void get_hit_rules_optimize_max_len_5(__u64 *rule_array[], __u32 *rule_array_len_ptr, __u64 *rule_array_index_ptr, __u64 *hit_rules_ptr)
{
switch (*rule_array_len_ptr)
{
case 1:
{
if (rule_array[0][*rule_array_index_ptr] > 0)
{
*hit_rules_ptr = rule_array[0][*rule_array_index_ptr];
return;
}
(*rule_array_index_ptr)++;
if (rule_array[0][*rule_array_index_ptr] > 0)
{
*hit_rules_ptr = rule_array[0][*rule_array_index_ptr];
return;
}
(*rule_array_index_ptr)++;
if (rule_array[0][*rule_array_index_ptr] > 0)
{
*hit_rules_ptr = rule_array[0][(*rule_array_index_ptr)];
return;
}
(*rule_array_index_ptr)++;
if (rule_array[0][*rule_array_index_ptr] > 0)
{
*hit_rules_ptr = rule_array[0][(*rule_array_index_ptr)];
return;
}
(*rule_array_index_ptr)++;
if (rule_array[0][*rule_array_index_ptr] > 0)
{
*hit_rules_ptr = rule_array[0][(*rule_array_index_ptr)];
return;
}
(*rule_array_index_ptr)++;
if (rule_array[0][*rule_array_index_ptr] > 0)
{
*hit_rules_ptr = rule_array[0][(*rule_array_index_ptr)];
return;
}
(*rule_array_index_ptr)++;
if (rule_array[0][*rule_array_index_ptr] > 0)
{
*hit_rules_ptr = rule_array[0][(*rule_array_index_ptr)];
return;
}
(*rule_array_index_ptr)++;
if (rule_array[0][*rule_array_index_ptr] > 0)
{
*hit_rules_ptr = rule_array[0][(*rule_array_index_ptr)];
return;
}
return;
}
case 2:
{
*hit_rules_ptr = (rule_array[0][*rule_array_index_ptr]) & (rule_array[1][*rule_array_index_ptr]);
if (*hit_rules_ptr > 0)
{
return;
}
(*rule_array_index_ptr)++;
*hit_rules_ptr = (rule_array[0][*rule_array_index_ptr]) & (rule_array[1][*rule_array_index_ptr]);
if (*hit_rules_ptr > 0)
{
return;
}
(*rule_array_index_ptr)++;
*hit_rules_ptr = (rule_array[0][*rule_array_index_ptr]) & (rule_array[1][*rule_array_index_ptr]);
if (*hit_rules_ptr > 0)
{
return;
}
(*rule_array_index_ptr)++;
*hit_rules_ptr = (rule_array[0][*rule_array_index_ptr]) & (rule_array[1][*rule_array_index_ptr]);
if (*hit_rules_ptr > 0)
{
return;
}
(*rule_array_index_ptr)++;
*hit_rules_ptr = (rule_array[0][*rule_array_index_ptr]) & (rule_array[1][*rule_array_index_ptr]);
if (*hit_rules_ptr > 0)
{
return;
}
(*rule_array_index_ptr)++;
*hit_rules_ptr = (rule_array[0][*rule_array_index_ptr]) & (rule_array[1][*rule_array_index_ptr]);
if (*hit_rules_ptr > 0)
{
return;
}
(*rule_array_index_ptr)++;
*hit_rules_ptr = (rule_array[0][*rule_array_index_ptr]) & (rule_array[1][*rule_array_index_ptr]);
if (*hit_rules_ptr > 0)
{
return;
}
(*rule_array_index_ptr)++;
*hit_rules_ptr = (rule_array[0][*rule_array_index_ptr]) & (rule_array[1][*rule_array_index_ptr]);
if (*hit_rules_ptr > 0)
{
return;
}
return;
}
case 3:
{
*hit_rules_ptr = (rule_array[0][*rule_array_index_ptr]) & (rule_array[1][*rule_array_index_ptr]) & (rule_array[2][*rule_array_index_ptr]);
if (*hit_rules_ptr > 0)
{
return;
}
(*rule_array_index_ptr)++;
*hit_rules_ptr = (rule_array[0][*rule_array_index_ptr]) & (rule_array[1][*rule_array_index_ptr]) & (rule_array[2][*rule_array_index_ptr]);
if (*hit_rules_ptr > 0)
{
return;
}
(*rule_array_index_ptr)++;
*hit_rules_ptr = (rule_array[0][*rule_array_index_ptr]) & (rule_array[1][*rule_array_index_ptr]) & (rule_array[2][*rule_array_index_ptr]);
if (*hit_rules_ptr > 0)
{
return;
}
(*rule_array_index_ptr)++;
*hit_rules_ptr = (rule_array[0][*rule_array_index_ptr]) & (rule_array[1][*rule_array_index_ptr]) & (rule_array[2][*rule_array_index_ptr]);
if (*hit_rules_ptr > 0)
{
return;
}
(*rule_array_index_ptr)++;
*hit_rules_ptr = (rule_array[0][*rule_array_index_ptr]) & (rule_array[1][*rule_array_index_ptr]) & (rule_array[2][*rule_array_index_ptr]);
if (*hit_rules_ptr > 0)
{
return;
}
(*rule_array_index_ptr)++;
*hit_rules_ptr = (rule_array[0][*rule_array_index_ptr]) & (rule_array[1][*rule_array_index_ptr]) & (rule_array[2][*rule_array_index_ptr]);
if (*hit_rules_ptr > 0)
{
return;
}
(*rule_array_index_ptr)++;
*hit_rules_ptr = (rule_array[0][*rule_array_index_ptr]) & (rule_array[1][*rule_array_index_ptr]) & (rule_array[2][*rule_array_index_ptr]);
if (*hit_rules_ptr > 0)
{
return;
}
(*rule_array_index_ptr)++;
*hit_rules_ptr = (rule_array[0][*rule_array_index_ptr]) & (rule_array[1][*rule_array_index_ptr]) & (rule_array[2][*rule_array_index_ptr]);
if (*hit_rules_ptr > 0)
{
return;
}
return;
}
case 4:
{
*hit_rules_ptr = (rule_array[0][*rule_array_index_ptr]) & (rule_array[1][*rule_array_index_ptr]) & (rule_array[2][*rule_array_index_ptr]) & (rule_array[3][*rule_array_index_ptr]);
if (*hit_rules_ptr > 0)
{
return;
}
(*rule_array_index_ptr)++;
*hit_rules_ptr = (rule_array[0][*rule_array_index_ptr]) & (rule_array[1][*rule_array_index_ptr]) & (rule_array[2][*rule_array_index_ptr]) & (rule_array[3][*rule_array_index_ptr]);
if (*hit_rules_ptr > 0)
{
return;
}
(*rule_array_index_ptr)++;
*hit_rules_ptr = (rule_array[0][*rule_array_index_ptr]) & (rule_array[1][*rule_array_index_ptr]) & (rule_array[2][*rule_array_index_ptr]) & (rule_array[3][*rule_array_index_ptr]);
if (*hit_rules_ptr > 0)
{
return;
}
(*rule_array_index_ptr)++;
*hit_rules_ptr = (rule_array[0][*rule_array_index_ptr]) & (rule_array[1][*rule_array_index_ptr]) & (rule_array[2][*rule_array_index_ptr]) & (rule_array[3][*rule_array_index_ptr]);
if (*hit_rules_ptr > 0)
{
return;
}
(*rule_array_index_ptr)++;
*hit_rules_ptr = (rule_array[0][*rule_array_index_ptr]) & (rule_array[1][*rule_array_index_ptr]) & (rule_array[2][*rule_array_index_ptr]) & (rule_array[3][*rule_array_index_ptr]);
if (*hit_rules_ptr > 0)
{
return;
}
(*rule_array_index_ptr)++;
*hit_rules_ptr = (rule_array[0][*rule_array_index_ptr]) & (rule_array[1][*rule_array_index_ptr]) & (rule_array[2][*rule_array_index_ptr]) & (rule_array[3][*rule_array_index_ptr]);
if (*hit_rules_ptr > 0)
{
return;
}