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authorAlexei Starovoitov <ast@plumgrid.com>2014-05-08 21:10:52 (GMT)
committerDavid S. Miller <davem@davemloft.net>2014-05-12 04:23:55 (GMT)
commit64a8946b447e418b4283c3573ef397980cca0cd8 (patch)
treeaf67f72649e1e3ac18a74bdb425ad3f48f611875 /lib/test_bpf.c
parent9739eef13c926645fbf88bcb77e66442fa75d688 (diff)
net: filter: BPF testsuite
The testsuite covers classic and internal BPF instructions. It is particularly useful for JIT compiler developers. Adds to "net" selftest target. The testsuite can be used as a set of micro-benchmarks. It measures execution time of each BPF program in nsec. This patch adds core framework. Signed-off-by: Alexei Starovoitov <ast@plumgrid.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'lib/test_bpf.c')
-rw-r--r--lib/test_bpf.c322
1 files changed, 322 insertions, 0 deletions
diff --git a/lib/test_bpf.c b/lib/test_bpf.c
new file mode 100644
index 0000000..9f25dc1
--- /dev/null
+++ b/lib/test_bpf.c
@@ -0,0 +1,322 @@
+/*
+ * Testsuite for BPF interpreter and BPF JIT compiler
+ *
+ * Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/filter.h>
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <linux/if_vlan.h>
+
+#define MAX_SUBTESTS 3
+#define MAX_DATA 128
+#define MAX_INSNS 512
+#define MAX_K 0xffffFFFF
+
+/* define few constants used to init test 'skb' */
+#define SKB_TYPE 3
+#define SKB_MARK 0x1234aaaa
+#define SKB_HASH 0x1234aaab
+#define SKB_QUEUE_MAP 123
+#define SKB_VLAN_TCI 0xffff
+#define SKB_DEV_IFINDEX 577
+#define SKB_DEV_TYPE 588
+
+/* redefine REGs to make tests less verbose */
+#define R0 BPF_REG_0
+#define R1 BPF_REG_1
+#define R2 BPF_REG_2
+#define R3 BPF_REG_3
+#define R4 BPF_REG_4
+#define R5 BPF_REG_5
+#define R6 BPF_REG_6
+#define R7 BPF_REG_7
+#define R8 BPF_REG_8
+#define R9 BPF_REG_9
+#define R10 BPF_REG_10
+
+struct bpf_test {
+ const char *descr;
+ union {
+ struct sock_filter insns[MAX_INSNS];
+ struct sock_filter_int insns_int[MAX_INSNS];
+ };
+ enum {
+ NO_DATA,
+ EXPECTED_FAIL,
+ SKB,
+ SKB_INT
+ } data_type;
+ __u8 data[MAX_DATA];
+ struct {
+ int data_size;
+ __u32 result;
+ } test[MAX_SUBTESTS];
+};
+
+static struct bpf_test tests[] = {
+ {
+ "TAX",
+ .insns = {
+ BPF_STMT(BPF_LD | BPF_IMM, 1),
+ BPF_STMT(BPF_MISC | BPF_TAX, 0),
+ BPF_STMT(BPF_LD | BPF_IMM, 2),
+ BPF_STMT(BPF_ALU | BPF_ADD | BPF_X, 0),
+ BPF_STMT(BPF_ALU | BPF_NEG, 0), /* A == -3 */
+ BPF_STMT(BPF_MISC | BPF_TAX, 0),
+ BPF_STMT(BPF_LD | BPF_LEN, 0),
+ BPF_STMT(BPF_ALU | BPF_ADD | BPF_X, 0),
+ BPF_STMT(BPF_MISC | BPF_TAX, 0), /* X == len - 3 */
+ BPF_STMT(BPF_LD | BPF_B | BPF_IND, 1),
+ BPF_STMT(BPF_RET | BPF_A, 0)
+ },
+ SKB,
+ { 10, 20, 30, 40, 50 },
+ { { 2, 10 }, { 3, 20 }, { 4, 30 } },
+ },
+ {
+ "tcpdump port 22",
+ .insns = {
+ { 0x28, 0, 0, 0x0000000c },
+ { 0x15, 0, 8, 0x000086dd },
+ { 0x30, 0, 0, 0x00000014 },
+ { 0x15, 2, 0, 0x00000084 },
+ { 0x15, 1, 0, 0x00000006 },
+ { 0x15, 0, 17, 0x00000011 },
+ { 0x28, 0, 0, 0x00000036 },
+ { 0x15, 14, 0, 0x00000016 },
+ { 0x28, 0, 0, 0x00000038 },
+ { 0x15, 12, 13, 0x00000016 },
+ { 0x15, 0, 12, 0x00000800 },
+ { 0x30, 0, 0, 0x00000017 },
+ { 0x15, 2, 0, 0x00000084 },
+ { 0x15, 1, 0, 0x00000006 },
+ { 0x15, 0, 8, 0x00000011 },
+ { 0x28, 0, 0, 0x00000014 },
+ { 0x45, 6, 0, 0x00001fff },
+ { 0xb1, 0, 0, 0x0000000e },
+ { 0x48, 0, 0, 0x0000000e },
+ { 0x15, 2, 0, 0x00000016 },
+ { 0x48, 0, 0, 0x00000010 },
+ { 0x15, 0, 1, 0x00000016 },
+ { 0x06, 0, 0, 0x0000ffff },
+ { 0x06, 0, 0, 0x00000000 },
+ },
+ SKB,
+ /* 3c:07:54:43:e5:76 > 10:bf:48:d6:43:d6, ethertype IPv4(0x0800)
+ * length 114: 10.1.1.149.49700 > 10.1.2.10.22: Flags [P.],
+ * seq 1305692979:1305693027, ack 3650467037, win 65535,
+ * options [nop,nop,TS val 2502645400 ecr 3971138], length 48
+ */
+ { 0x10, 0xbf, 0x48, 0xd6, 0x43, 0xd6,
+ 0x3c, 0x07, 0x54, 0x43, 0xe5, 0x76,
+ 0x08, 0x00,
+ 0x45, 0x10, 0x00, 0x64, 0x75, 0xb5,
+ 0x40, 0x00, 0x40, 0x06, 0xad, 0x2e, /* IP header */
+ 0x0a, 0x01, 0x01, 0x95, /* ip src */
+ 0x0a, 0x01, 0x02, 0x0a, /* ip dst */
+ 0xc2, 0x24,
+ 0x00, 0x16 /* dst port */ },
+ { { 10, 0 }, { 30, 0 }, { 100, 65535 } },
+ },
+ {
+ "INT: DIV + ABS",
+ .insns_int = {
+ BPF_ALU64_REG(BPF_MOV, R6, R1),
+ BPF_LD_ABS(BPF_B, 3),
+ BPF_ALU64_IMM(BPF_MOV, R2, 2),
+ BPF_ALU32_REG(BPF_DIV, R0, R2),
+ BPF_ALU64_REG(BPF_MOV, R8, R0),
+ BPF_LD_ABS(BPF_B, 4),
+ BPF_ALU64_REG(BPF_ADD, R8, R0),
+ BPF_LD_IND(BPF_B, R8, -70),
+ BPF_EXIT_INSN(),
+ },
+ SKB_INT,
+ { 10, 20, 30, 40, 50 },
+ { { 4, 0 }, { 5, 10 } }
+ },
+ {
+ "check: missing ret",
+ .insns = {
+ BPF_STMT(BPF_LD | BPF_IMM, 1),
+ },
+ EXPECTED_FAIL,
+ { },
+ { }
+ },
+};
+
+static int get_length(struct sock_filter *fp)
+{
+ int len = 0;
+
+ while (fp->code != 0 || fp->k != 0) {
+ fp++;
+ len++;
+ }
+
+ return len;
+}
+
+struct net_device dev;
+struct sk_buff *populate_skb(char *buf, int size)
+{
+ struct sk_buff *skb;
+
+ if (size >= MAX_DATA)
+ return NULL;
+
+ skb = alloc_skb(MAX_DATA, GFP_KERNEL);
+ if (!skb)
+ return NULL;
+
+ memcpy(__skb_put(skb, size), buf, size);
+ skb_reset_mac_header(skb);
+ skb->protocol = htons(ETH_P_IP);
+ skb->pkt_type = SKB_TYPE;
+ skb->mark = SKB_MARK;
+ skb->hash = SKB_HASH;
+ skb->queue_mapping = SKB_QUEUE_MAP;
+ skb->vlan_tci = SKB_VLAN_TCI;
+ skb->dev = &dev;
+ skb->dev->ifindex = SKB_DEV_IFINDEX;
+ skb->dev->type = SKB_DEV_TYPE;
+ skb_set_network_header(skb, min(size, ETH_HLEN));
+
+ return skb;
+}
+
+static int run_one(struct sk_filter *fp, struct bpf_test *t)
+{
+ u64 start, finish, res, cnt = 100000;
+ int err_cnt = 0, err, i, j;
+ u32 ret = 0;
+ void *data;
+
+ for (i = 0; i < MAX_SUBTESTS; i++) {
+ if (t->test[i].data_size == 0 &&
+ t->test[i].result == 0)
+ break;
+ if (t->data_type == SKB ||
+ t->data_type == SKB_INT) {
+ data = populate_skb(t->data, t->test[i].data_size);
+ if (!data)
+ return -ENOMEM;
+ } else {
+ data = NULL;
+ }
+
+ start = ktime_to_us(ktime_get());
+ for (j = 0; j < cnt; j++)
+ ret = SK_RUN_FILTER(fp, data);
+ finish = ktime_to_us(ktime_get());
+
+ res = (finish - start) * 1000;
+ do_div(res, cnt);
+
+ err = ret != t->test[i].result;
+ if (!err)
+ pr_cont("%lld ", res);
+
+ if (t->data_type == SKB || t->data_type == SKB_INT)
+ kfree_skb(data);
+
+ if (err) {
+ pr_cont("ret %d != %d ", ret, t->test[i].result);
+ err_cnt++;
+ }
+ }
+
+ return err_cnt;
+}
+
+static __init int test_bpf(void)
+{
+ struct sk_filter *fp, *fp_ext = NULL;
+ struct sock_fprog fprog;
+ int err, i, err_cnt = 0;
+
+ for (i = 0; i < ARRAY_SIZE(tests); i++) {
+ pr_info("#%d %s ", i, tests[i].descr);
+
+ fprog.filter = tests[i].insns;
+ fprog.len = get_length(fprog.filter);
+
+ if (tests[i].data_type == SKB_INT) {
+ fp_ext = kzalloc(4096, GFP_KERNEL);
+ if (!fp_ext)
+ return -ENOMEM;
+ fp = fp_ext;
+ memcpy(fp_ext->insns, tests[i].insns_int,
+ fprog.len * 8);
+ fp->len = fprog.len;
+ fp->bpf_func = sk_run_filter_int_skb;
+ } else {
+ err = sk_unattached_filter_create(&fp, &fprog);
+ if (tests[i].data_type == EXPECTED_FAIL) {
+ if (err == -EINVAL) {
+ pr_cont("PASS\n");
+ continue;
+ } else {
+ pr_cont("UNEXPECTED_PASS\n");
+ /* verifier didn't reject the test
+ * that's bad enough, just return
+ */
+ return -EINVAL;
+ }
+ }
+ if (err) {
+ pr_cont("FAIL to attach err=%d len=%d\n",
+ err, fprog.len);
+ return err;
+ }
+ }
+
+ err = run_one(fp, &tests[i]);
+
+ if (tests[i].data_type != SKB_INT)
+ sk_unattached_filter_destroy(fp);
+ else
+ kfree(fp);
+
+ if (err) {
+ pr_cont("FAIL %d\n", err);
+ err_cnt++;
+ } else {
+ pr_cont("PASS\n");
+ }
+ }
+
+ if (err_cnt)
+ return -EINVAL;
+ else
+ return 0;
+}
+
+static int __init test_bpf_init(void)
+{
+ return test_bpf();
+}
+
+static void __exit test_bpf_exit(void)
+{
+}
+
+module_init(test_bpf_init);
+module_exit(test_bpf_exit);
+MODULE_LICENSE("GPL");

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