forked from Minki/linux
bpf: Add tests for the lpm trie map
The first part of this program runs randomized tests against the lpm-bpf-map. It implements a "Trivial Longest Prefix Match" (tlpm) based on simple, linear, single linked lists. The implementation should be pretty straightforward. Based on tlpm, this inserts randomized data into bpf-lpm-maps and verifies the trie-based bpf-map implementation behaves the same way as tlpm. The second part uses 'real world' IPv4 and IPv6 addresses and tests the trie with those. Signed-off-by: David Herrmann <dh.herrmann@gmail.com> Signed-off-by: Daniel Mack <daniel@zonque.org> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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1
tools/testing/selftests/bpf/.gitignore
vendored
1
tools/testing/selftests/bpf/.gitignore
vendored
@ -1,3 +1,4 @@
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test_verifier
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test_maps
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test_lru_map
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test_lpm_map
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@ -1,8 +1,8 @@
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CFLAGS += -Wall -O2 -I../../../../usr/include
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test_objs = test_verifier test_maps test_lru_map
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test_objs = test_verifier test_maps test_lru_map test_lpm_map
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TEST_PROGS := test_verifier test_maps test_lru_map test_kmod.sh
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TEST_PROGS := test_verifier test_maps test_lru_map test_lpm_map test_kmod.sh
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TEST_FILES := $(test_objs)
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all: $(test_objs)
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358
tools/testing/selftests/bpf/test_lpm_map.c
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358
tools/testing/selftests/bpf/test_lpm_map.c
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/*
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* Randomized tests for eBPF longest-prefix-match maps
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*
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* This program runs randomized tests against the lpm-bpf-map. It implements a
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* "Trivial Longest Prefix Match" (tlpm) based on simple, linear, singly linked
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* lists. The implementation should be pretty straightforward.
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*
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* Based on tlpm, this inserts randomized data into bpf-lpm-maps and verifies
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* the trie-based bpf-map implementation behaves the same way as tlpm.
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*/
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#include <assert.h>
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#include <errno.h>
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#include <inttypes.h>
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#include <linux/bpf.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include <arpa/inet.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include "bpf_sys.h"
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#include "bpf_util.h"
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struct tlpm_node {
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struct tlpm_node *next;
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size_t n_bits;
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uint8_t key[];
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};
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static struct tlpm_node *tlpm_add(struct tlpm_node *list,
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const uint8_t *key,
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size_t n_bits)
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{
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struct tlpm_node *node;
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size_t n;
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/* add new entry with @key/@n_bits to @list and return new head */
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n = (n_bits + 7) / 8;
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node = malloc(sizeof(*node) + n);
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assert(node);
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node->next = list;
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node->n_bits = n_bits;
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memcpy(node->key, key, n);
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return node;
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}
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static void tlpm_clear(struct tlpm_node *list)
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{
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struct tlpm_node *node;
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/* free all entries in @list */
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while ((node = list)) {
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list = list->next;
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free(node);
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}
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}
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static struct tlpm_node *tlpm_match(struct tlpm_node *list,
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const uint8_t *key,
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size_t n_bits)
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{
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struct tlpm_node *best = NULL;
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size_t i;
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/* Perform longest prefix-match on @key/@n_bits. That is, iterate all
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* entries and match each prefix against @key. Remember the "best"
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* entry we find (i.e., the longest prefix that matches) and return it
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* to the caller when done.
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*/
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for ( ; list; list = list->next) {
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for (i = 0; i < n_bits && i < list->n_bits; ++i) {
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if ((key[i / 8] & (1 << (7 - i % 8))) !=
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(list->key[i / 8] & (1 << (7 - i % 8))))
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break;
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}
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if (i >= list->n_bits) {
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if (!best || i > best->n_bits)
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best = list;
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}
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}
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return best;
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}
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static void test_lpm_basic(void)
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{
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struct tlpm_node *list = NULL, *t1, *t2;
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/* very basic, static tests to verify tlpm works as expected */
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assert(!tlpm_match(list, (uint8_t[]){ 0xff }, 8));
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t1 = list = tlpm_add(list, (uint8_t[]){ 0xff }, 8);
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assert(t1 == tlpm_match(list, (uint8_t[]){ 0xff }, 8));
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assert(t1 == tlpm_match(list, (uint8_t[]){ 0xff, 0xff }, 16));
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assert(t1 == tlpm_match(list, (uint8_t[]){ 0xff, 0x00 }, 16));
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assert(!tlpm_match(list, (uint8_t[]){ 0x7f }, 8));
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assert(!tlpm_match(list, (uint8_t[]){ 0xfe }, 8));
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assert(!tlpm_match(list, (uint8_t[]){ 0xff }, 7));
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t2 = list = tlpm_add(list, (uint8_t[]){ 0xff, 0xff }, 16);
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assert(t1 == tlpm_match(list, (uint8_t[]){ 0xff }, 8));
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assert(t2 == tlpm_match(list, (uint8_t[]){ 0xff, 0xff }, 16));
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assert(t1 == tlpm_match(list, (uint8_t[]){ 0xff, 0xff }, 15));
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assert(!tlpm_match(list, (uint8_t[]){ 0x7f, 0xff }, 16));
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tlpm_clear(list);
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}
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static void test_lpm_order(void)
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{
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struct tlpm_node *t1, *t2, *l1 = NULL, *l2 = NULL;
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size_t i, j;
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/* Verify the tlpm implementation works correctly regardless of the
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* order of entries. Insert a random set of entries into @l1, and copy
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* the same data in reverse order into @l2. Then verify a lookup of
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* random keys will yield the same result in both sets.
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*/
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for (i = 0; i < (1 << 12); ++i)
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l1 = tlpm_add(l1, (uint8_t[]){
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rand() % 0xff,
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rand() % 0xff,
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}, rand() % 16 + 1);
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for (t1 = l1; t1; t1 = t1->next)
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l2 = tlpm_add(l2, t1->key, t1->n_bits);
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for (i = 0; i < (1 << 8); ++i) {
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uint8_t key[] = { rand() % 0xff, rand() % 0xff };
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t1 = tlpm_match(l1, key, 16);
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t2 = tlpm_match(l2, key, 16);
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assert(!t1 == !t2);
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if (t1) {
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assert(t1->n_bits == t2->n_bits);
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for (j = 0; j < t1->n_bits; ++j)
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assert((t1->key[j / 8] & (1 << (7 - j % 8))) ==
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(t2->key[j / 8] & (1 << (7 - j % 8))));
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}
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}
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tlpm_clear(l1);
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tlpm_clear(l2);
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}
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static void test_lpm_map(int keysize)
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{
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size_t i, j, n_matches, n_nodes, n_lookups;
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struct tlpm_node *t, *list = NULL;
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struct bpf_lpm_trie_key *key;
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uint8_t *data, *value;
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int r, map;
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/* Compare behavior of tlpm vs. bpf-lpm. Create a randomized set of
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* prefixes and insert it into both tlpm and bpf-lpm. Then run some
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* randomized lookups and verify both maps return the same result.
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*/
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n_matches = 0;
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n_nodes = 1 << 8;
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n_lookups = 1 << 16;
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data = alloca(keysize);
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memset(data, 0, keysize);
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value = alloca(keysize + 1);
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memset(value, 0, keysize + 1);
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key = alloca(sizeof(*key) + keysize);
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memset(key, 0, sizeof(*key) + keysize);
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map = bpf_map_create(BPF_MAP_TYPE_LPM_TRIE,
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sizeof(*key) + keysize,
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keysize + 1,
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4096,
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BPF_F_NO_PREALLOC);
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assert(map >= 0);
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for (i = 0; i < n_nodes; ++i) {
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for (j = 0; j < keysize; ++j)
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value[j] = rand() & 0xff;
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value[keysize] = rand() % (8 * keysize + 1);
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list = tlpm_add(list, value, value[keysize]);
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key->prefixlen = value[keysize];
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memcpy(key->data, value, keysize);
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r = bpf_map_update(map, key, value, 0);
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assert(!r);
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}
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for (i = 0; i < n_lookups; ++i) {
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for (j = 0; j < keysize; ++j)
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data[j] = rand() & 0xff;
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t = tlpm_match(list, data, 8 * keysize);
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key->prefixlen = 8 * keysize;
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memcpy(key->data, data, keysize);
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r = bpf_map_lookup(map, key, value);
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assert(!r || errno == ENOENT);
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assert(!t == !!r);
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if (t) {
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++n_matches;
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assert(t->n_bits == value[keysize]);
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for (j = 0; j < t->n_bits; ++j)
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assert((t->key[j / 8] & (1 << (7 - j % 8))) ==
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(value[j / 8] & (1 << (7 - j % 8))));
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}
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}
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close(map);
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tlpm_clear(list);
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/* With 255 random nodes in the map, we are pretty likely to match
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* something on every lookup. For statistics, use this:
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*
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* printf(" nodes: %zu\n"
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* "lookups: %zu\n"
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* "matches: %zu\n", n_nodes, n_lookups, n_matches);
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*/
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}
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/* Test the implementation with some 'real world' examples */
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static void test_lpm_ipaddr(void)
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{
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struct bpf_lpm_trie_key *key_ipv4;
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struct bpf_lpm_trie_key *key_ipv6;
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size_t key_size_ipv4;
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size_t key_size_ipv6;
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int map_fd_ipv4;
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int map_fd_ipv6;
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__u64 value;
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key_size_ipv4 = sizeof(*key_ipv4) + sizeof(__u32);
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key_size_ipv6 = sizeof(*key_ipv6) + sizeof(__u32) * 4;
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key_ipv4 = alloca(key_size_ipv4);
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key_ipv6 = alloca(key_size_ipv6);
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map_fd_ipv4 = bpf_map_create(BPF_MAP_TYPE_LPM_TRIE,
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key_size_ipv4, sizeof(value),
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100, BPF_F_NO_PREALLOC);
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assert(map_fd_ipv4 >= 0);
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map_fd_ipv6 = bpf_map_create(BPF_MAP_TYPE_LPM_TRIE,
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key_size_ipv6, sizeof(value),
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100, BPF_F_NO_PREALLOC);
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assert(map_fd_ipv6 >= 0);
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/* Fill data some IPv4 and IPv6 address ranges */
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value = 1;
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key_ipv4->prefixlen = 16;
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inet_pton(AF_INET, "192.168.0.0", key_ipv4->data);
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assert(bpf_map_update(map_fd_ipv4, key_ipv4, &value, 0) == 0);
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value = 2;
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key_ipv4->prefixlen = 24;
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inet_pton(AF_INET, "192.168.0.0", key_ipv4->data);
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assert(bpf_map_update(map_fd_ipv4, key_ipv4, &value, 0) == 0);
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value = 3;
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key_ipv4->prefixlen = 24;
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inet_pton(AF_INET, "192.168.128.0", key_ipv4->data);
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assert(bpf_map_update(map_fd_ipv4, key_ipv4, &value, 0) == 0);
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value = 5;
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key_ipv4->prefixlen = 24;
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inet_pton(AF_INET, "192.168.1.0", key_ipv4->data);
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assert(bpf_map_update(map_fd_ipv4, key_ipv4, &value, 0) == 0);
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value = 4;
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key_ipv4->prefixlen = 23;
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inet_pton(AF_INET, "192.168.0.0", key_ipv4->data);
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assert(bpf_map_update(map_fd_ipv4, key_ipv4, &value, 0) == 0);
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value = 0xdeadbeef;
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key_ipv6->prefixlen = 64;
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inet_pton(AF_INET6, "2a00:1450:4001:814::200e", key_ipv6->data);
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assert(bpf_map_update(map_fd_ipv6, key_ipv6, &value, 0) == 0);
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/* Set tprefixlen to maximum for lookups */
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key_ipv4->prefixlen = 32;
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key_ipv6->prefixlen = 128;
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/* Test some lookups that should come back with a value */
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inet_pton(AF_INET, "192.168.128.23", key_ipv4->data);
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assert(bpf_map_lookup(map_fd_ipv4, key_ipv4, &value) == 0);
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assert(value == 3);
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inet_pton(AF_INET, "192.168.0.1", key_ipv4->data);
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assert(bpf_map_lookup(map_fd_ipv4, key_ipv4, &value) == 0);
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assert(value == 2);
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inet_pton(AF_INET6, "2a00:1450:4001:814::", key_ipv6->data);
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assert(bpf_map_lookup(map_fd_ipv6, key_ipv6, &value) == 0);
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assert(value == 0xdeadbeef);
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inet_pton(AF_INET6, "2a00:1450:4001:814::1", key_ipv6->data);
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assert(bpf_map_lookup(map_fd_ipv6, key_ipv6, &value) == 0);
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assert(value == 0xdeadbeef);
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/* Test some lookups that should not match any entry */
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inet_pton(AF_INET, "10.0.0.1", key_ipv4->data);
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assert(bpf_map_lookup(map_fd_ipv4, key_ipv4, &value) == -1 &&
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errno == ENOENT);
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inet_pton(AF_INET, "11.11.11.11", key_ipv4->data);
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assert(bpf_map_lookup(map_fd_ipv4, key_ipv4, &value) == -1 &&
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errno == ENOENT);
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inet_pton(AF_INET6, "2a00:ffff::", key_ipv6->data);
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assert(bpf_map_lookup(map_fd_ipv6, key_ipv6, &value) == -1 &&
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errno == ENOENT);
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close(map_fd_ipv4);
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close(map_fd_ipv6);
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}
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int main(void)
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{
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struct rlimit limit = { RLIM_INFINITY, RLIM_INFINITY };
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int i, ret;
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/* we want predictable, pseudo random tests */
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srand(0xf00ba1);
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/* allow unlimited locked memory */
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ret = setrlimit(RLIMIT_MEMLOCK, &limit);
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if (ret < 0)
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perror("Unable to lift memlock rlimit");
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test_lpm_basic();
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test_lpm_order();
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/* Test with 8, 16, 24, 32, ... 128 bit prefix length */
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for (i = 1; i <= 16; ++i)
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test_lpm_map(i);
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test_lpm_ipaddr();
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printf("test_lpm: OK\n");
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return 0;
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}
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