selftests/bpf: add realistic loop tests
Add a bunch of loop tests. Most of them are created by replacing '#pragma unroll' with '#pragma clang loop unroll(disable)' Several tests are artificially large: /* partial unroll. llvm will unroll loop ~150 times. * C loop count -> 600. * Asm loop count -> 4. * 16k insns in loop body. * Total of 5 such loops. Total program size ~82k insns. */ "./pyperf600.o", /* no unroll at all. * C loop count -> 600. * ASM loop count -> 600. * ~110 insns in loop body. * Total of 5 such loops. Total program size ~1500 insns. */ "./pyperf600_nounroll.o", /* partial unroll. 19k insn in a loop. * Total program size 20.8k insn. * ~350k processed_insns */ "./strobemeta.o", Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Alexei Starovoitov
Daniel Borkmann
parent
0d3679e99a
commit
b061017f8b
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@ -5,7 +5,7 @@ static int libbpf_debug_print(enum libbpf_print_level level,
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const char *format, va_list args)
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{
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if (level != LIBBPF_DEBUG)
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return 0;
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return vfprintf(stderr, format, args);
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if (!strstr(format, "verifier log"))
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return 0;
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@ -32,24 +32,69 @@ static int check_load(const char *file, enum bpf_prog_type type)
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void test_bpf_verif_scale(void)
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{
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const char *scale[] = {
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"./test_verif_scale1.o", "./test_verif_scale2.o", "./test_verif_scale3.o"
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const char *sched_cls[] = {
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"./test_verif_scale1.o", "./test_verif_scale2.o", "./test_verif_scale3.o",
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};
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const char *pyperf[] = {
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"./pyperf50.o", "./pyperf100.o", "./pyperf180.o"
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const char *raw_tp[] = {
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/* full unroll by llvm */
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"./pyperf50.o", "./pyperf100.o", "./pyperf180.o",
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/* partial unroll. llvm will unroll loop ~150 times.
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* C loop count -> 600.
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* Asm loop count -> 4.
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* 16k insns in loop body.
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* Total of 5 such loops. Total program size ~82k insns.
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*/
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"./pyperf600.o",
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/* no unroll at all.
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* C loop count -> 600.
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* ASM loop count -> 600.
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* ~110 insns in loop body.
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* Total of 5 such loops. Total program size ~1500 insns.
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*/
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"./pyperf600_nounroll.o",
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"./loop1.o", "./loop2.o",
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/* partial unroll. 19k insn in a loop.
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* Total program size 20.8k insn.
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* ~350k processed_insns
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*/
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"./strobemeta.o",
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/* no unroll, tiny loops */
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"./strobemeta_nounroll1.o",
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"./strobemeta_nounroll2.o",
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};
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const char *cg_sysctl[] = {
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"./test_sysctl_loop1.o", "./test_sysctl_loop2.o",
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};
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int err, i;
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if (verifier_stats)
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libbpf_set_print(libbpf_debug_print);
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for (i = 0; i < ARRAY_SIZE(scale); i++) {
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err = check_load(scale[i], BPF_PROG_TYPE_SCHED_CLS);
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printf("test_scale:%s:%s\n", scale[i], err ? "FAIL" : "OK");
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err = check_load("./loop3.o", BPF_PROG_TYPE_RAW_TRACEPOINT);
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printf("test_scale:loop3:%s\n", err ? (error_cnt--, "OK") : "FAIL");
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for (i = 0; i < ARRAY_SIZE(sched_cls); i++) {
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err = check_load(sched_cls[i], BPF_PROG_TYPE_SCHED_CLS);
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printf("test_scale:%s:%s\n", sched_cls[i], err ? "FAIL" : "OK");
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}
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for (i = 0; i < ARRAY_SIZE(pyperf); i++) {
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err = check_load(pyperf[i], BPF_PROG_TYPE_RAW_TRACEPOINT);
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printf("test_scale:%s:%s\n", pyperf[i], err ? "FAIL" : "OK");
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for (i = 0; i < ARRAY_SIZE(raw_tp); i++) {
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err = check_load(raw_tp[i], BPF_PROG_TYPE_RAW_TRACEPOINT);
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printf("test_scale:%s:%s\n", raw_tp[i], err ? "FAIL" : "OK");
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}
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for (i = 0; i < ARRAY_SIZE(cg_sysctl); i++) {
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err = check_load(cg_sysctl[i], BPF_PROG_TYPE_CGROUP_SYSCTL);
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printf("test_scale:%s:%s\n", cg_sysctl[i], err ? "FAIL" : "OK");
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}
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err = check_load("./test_xdp_loop.o", BPF_PROG_TYPE_XDP);
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printf("test_scale:test_xdp_loop:%s\n", err ? "FAIL" : "OK");
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err = check_load("./test_seg6_loop.o", BPF_PROG_TYPE_LWT_SEG6LOCAL);
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printf("test_scale:test_seg6_loop:%s\n", err ? "FAIL" : "OK");
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}
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@ -0,0 +1,28 @@
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2019 Facebook
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#include <linux/sched.h>
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#include <linux/ptrace.h>
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#include <stdint.h>
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#include <stddef.h>
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#include <stdbool.h>
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#include <linux/bpf.h>
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#include "bpf_helpers.h"
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char _license[] SEC("license") = "GPL";
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SEC("raw_tracepoint/kfree_skb")
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int nested_loops(volatile struct pt_regs* ctx)
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{
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int i, j, sum = 0, m;
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for (j = 0; j < 300; j++)
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for (i = 0; i < j; i++) {
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if (j & 1)
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m = ctx->rax;
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else
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m = j;
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sum += i * m;
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}
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return sum;
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}
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@ -0,0 +1,28 @@
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2019 Facebook
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#include <linux/sched.h>
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#include <linux/ptrace.h>
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#include <stdint.h>
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#include <stddef.h>
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#include <stdbool.h>
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#include <linux/bpf.h>
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#include "bpf_helpers.h"
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char _license[] SEC("license") = "GPL";
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SEC("raw_tracepoint/consume_skb")
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int while_true(volatile struct pt_regs* ctx)
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{
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int i = 0;
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while (true) {
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if (ctx->rax & 1)
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i += 3;
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else
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i += 7;
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if (i > 40)
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break;
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}
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return i;
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}
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@ -0,0 +1,22 @@
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2019 Facebook
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#include <linux/sched.h>
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#include <linux/ptrace.h>
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#include <stdint.h>
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#include <stddef.h>
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#include <stdbool.h>
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#include <linux/bpf.h>
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#include "bpf_helpers.h"
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char _license[] SEC("license") = "GPL";
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SEC("raw_tracepoint/consume_skb")
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int while_true(volatile struct pt_regs* ctx)
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{
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__u64 i = 0, sum = 0;
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do {
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i++;
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sum += ctx->rax;
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} while (i < 0x100000000ULL);
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return sum;
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}
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@ -220,7 +220,11 @@ static inline __attribute__((__always_inline__)) int __on_event(struct pt_regs *
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int32_t* symbol_counter = bpf_map_lookup_elem(&symbolmap, &sym);
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if (symbol_counter == NULL)
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return 0;
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#pragma unroll
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#ifdef NO_UNROLL
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#pragma clang loop unroll(disable)
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#else
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#pragma clang loop unroll(full)
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#endif
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/* Unwind python stack */
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for (int i = 0; i < STACK_MAX_LEN; ++i) {
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if (frame_ptr && get_frame_data(frame_ptr, pidData, &frame, &sym)) {
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@ -0,0 +1,9 @@
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2019 Facebook
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#define STACK_MAX_LEN 600
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/* clang will not unroll the loop 600 times.
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* Instead it will unroll it to the amount it deemed
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* appropriate, but the loop will still execute 600 times.
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* Total program size is around 90k insns
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*/
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#include "pyperf.h"
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@ -0,0 +1,8 @@
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2019 Facebook
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#define STACK_MAX_LEN 600
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#define NO_UNROLL
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/* clang will not unroll at all.
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* Total program size is around 2k insns
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*/
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#include "pyperf.h"
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@ -0,0 +1,10 @@
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// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
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// Copyright (c) 2019 Facebook
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#define STROBE_MAX_INTS 2
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#define STROBE_MAX_STRS 25
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#define STROBE_MAX_MAPS 100
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#define STROBE_MAX_MAP_ENTRIES 20
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/* full unroll by llvm #undef NO_UNROLL */
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#include "strobemeta.h"
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@ -0,0 +1,528 @@
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2019 Facebook
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#include <stdint.h>
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#include <stddef.h>
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#include <stdbool.h>
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#include <linux/bpf.h>
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#include <linux/ptrace.h>
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#include <linux/sched.h>
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#include <linux/types.h>
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#include "bpf_helpers.h"
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typedef uint32_t pid_t;
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struct task_struct {};
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#define TASK_COMM_LEN 16
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#define PERF_MAX_STACK_DEPTH 127
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#define STROBE_TYPE_INVALID 0
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#define STROBE_TYPE_INT 1
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#define STROBE_TYPE_STR 2
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#define STROBE_TYPE_MAP 3
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#define STACK_TABLE_EPOCH_SHIFT 20
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#define STROBE_MAX_STR_LEN 1
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#define STROBE_MAX_CFGS 32
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#define STROBE_MAX_PAYLOAD \
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(STROBE_MAX_STRS * STROBE_MAX_STR_LEN + \
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STROBE_MAX_MAPS * (1 + STROBE_MAX_MAP_ENTRIES * 2) * STROBE_MAX_STR_LEN)
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struct strobe_value_header {
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/*
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* meaning depends on type:
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* 1. int: 0, if value not set, 1 otherwise
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* 2. str: 1 always, whether value is set or not is determined by ptr
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* 3. map: 1 always, pointer points to additional struct with number
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* of entries (up to STROBE_MAX_MAP_ENTRIES)
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*/
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uint16_t len;
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/*
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* _reserved might be used for some future fields/flags, but we always
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* want to keep strobe_value_header to be 8 bytes, so BPF can read 16
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* bytes in one go and get both header and value
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*/
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uint8_t _reserved[6];
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};
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/*
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* strobe_value_generic is used from BPF probe only, but needs to be a union
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* of strobe_value_int/strobe_value_str/strobe_value_map
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*/
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struct strobe_value_generic {
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struct strobe_value_header header;
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union {
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int64_t val;
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void *ptr;
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};
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};
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struct strobe_value_int {
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struct strobe_value_header header;
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int64_t value;
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};
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struct strobe_value_str {
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struct strobe_value_header header;
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const char* value;
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};
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struct strobe_value_map {
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struct strobe_value_header header;
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const struct strobe_map_raw* value;
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};
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struct strobe_map_entry {
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const char* key;
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const char* val;
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};
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/*
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* Map of C-string key/value pairs with fixed maximum capacity. Each map has
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* corresponding int64 ID, which application can use (or ignore) in whatever
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* way appropriate. Map is "write-only", there is no way to get data out of
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* map. Map is intended to be used to provide metadata for profilers and is
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* not to be used for internal in-app communication. All methods are
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* thread-safe.
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*/
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struct strobe_map_raw {
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/*
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* general purpose unique ID that's up to application to decide
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* whether and how to use; for request metadata use case id is unique
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* request ID that's used to match metadata with stack traces on
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* Strobelight backend side
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*/
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int64_t id;
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/* number of used entries in map */
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int64_t cnt;
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/*
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* having volatile doesn't change anything on BPF side, but clang
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* emits warnings for passing `volatile const char *` into
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* bpf_probe_read_str that expects just `const char *`
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*/
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const char* tag;
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/*
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* key/value entries, each consisting of 2 pointers to key and value
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* C strings
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*/
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struct strobe_map_entry entries[STROBE_MAX_MAP_ENTRIES];
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};
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/* Following values define supported values of TLS mode */
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#define TLS_NOT_SET -1
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#define TLS_LOCAL_EXEC 0
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#define TLS_IMM_EXEC 1
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#define TLS_GENERAL_DYN 2
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/*
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* structure that universally represents TLS location (both for static
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* executables and shared libraries)
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*/
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struct strobe_value_loc {
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/*
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* tls_mode defines what TLS mode was used for particular metavariable:
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* - -1 (TLS_NOT_SET) - no metavariable;
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* - 0 (TLS_LOCAL_EXEC) - Local Executable mode;
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* - 1 (TLS_IMM_EXEC) - Immediate Executable mode;
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* - 2 (TLS_GENERAL_DYN) - General Dynamic mode;
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* Local Dynamic mode is not yet supported, because never seen in
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* practice. Mode defines how offset field is interpreted. See
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* calc_location() in below for details.
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*/
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int64_t tls_mode;
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/*
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* TLS_LOCAL_EXEC: offset from thread pointer (fs:0 for x86-64,
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* tpidr_el0 for aarch64).
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* TLS_IMM_EXEC: absolute address of GOT entry containing offset
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* from thread pointer;
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* TLS_GENERAL_DYN: absolute addres of double GOT entry
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* containing tls_index_t struct;
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*/
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int64_t offset;
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};
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struct strobemeta_cfg {
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int64_t req_meta_idx;
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struct strobe_value_loc int_locs[STROBE_MAX_INTS];
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struct strobe_value_loc str_locs[STROBE_MAX_STRS];
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struct strobe_value_loc map_locs[STROBE_MAX_MAPS];
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};
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struct strobe_map_descr {
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uint64_t id;
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int16_t tag_len;
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/*
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* cnt <0 - map value isn't set;
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* 0 - map has id set, but no key/value entries
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*/
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int16_t cnt;
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/*
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* both key_lens[i] and val_lens[i] should be >0 for present key/value
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* entry
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*/
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uint16_t key_lens[STROBE_MAX_MAP_ENTRIES];
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uint16_t val_lens[STROBE_MAX_MAP_ENTRIES];
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};
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struct strobemeta_payload {
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/* req_id has valid request ID, if req_meta_valid == 1 */
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int64_t req_id;
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uint8_t req_meta_valid;
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/*
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* mask has Nth bit set to 1, if Nth metavar was present and
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* successfully read
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*/
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uint64_t int_vals_set_mask;
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int64_t int_vals[STROBE_MAX_INTS];
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/* len is >0 for present values */
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uint16_t str_lens[STROBE_MAX_STRS];
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/* if map_descrs[i].cnt == -1, metavar is not present/set */
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struct strobe_map_descr map_descrs[STROBE_MAX_MAPS];
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/*
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* payload has compactly packed values of str and map variables in the
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* form: strval1\0strval2\0map1key1\0map1val1\0map2key1\0map2val1\0
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* (and so on); str_lens[i], key_lens[i] and val_lens[i] determines
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* value length
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*/
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char payload[STROBE_MAX_PAYLOAD];
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};
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struct strobelight_bpf_sample {
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uint64_t ktime;
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char comm[TASK_COMM_LEN];
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pid_t pid;
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int user_stack_id;
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int kernel_stack_id;
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int has_meta;
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struct strobemeta_payload metadata;
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/*
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* makes it possible to pass (<real payload size> + 1) as data size to
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* perf_submit() to avoid perf_submit's paranoia about passing zero as
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* size, as it deduces that <real payload size> might be
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* **theoretically** zero
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*/
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char dummy_safeguard;
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};
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struct bpf_map_def SEC("maps") samples = {
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.type = BPF_MAP_TYPE_PERF_EVENT_ARRAY,
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.key_size = sizeof(int),
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.value_size = sizeof(int),
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.max_entries = 32,
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};
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struct bpf_map_def SEC("maps") stacks_0 = {
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.type = BPF_MAP_TYPE_STACK_TRACE,
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.key_size = sizeof(uint32_t),
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.value_size = sizeof(uint64_t) * PERF_MAX_STACK_DEPTH,
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.max_entries = 16,
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};
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|
||||
struct bpf_map_def SEC("maps") stacks_1 = {
|
||||
.type = BPF_MAP_TYPE_STACK_TRACE,
|
||||
.key_size = sizeof(uint32_t),
|
||||
.value_size = sizeof(uint64_t) * PERF_MAX_STACK_DEPTH,
|
||||
.max_entries = 16,
|
||||
};
|
||||
|
||||
struct bpf_map_def SEC("maps") sample_heap = {
|
||||
.type = BPF_MAP_TYPE_PERCPU_ARRAY,
|
||||
.key_size = sizeof(uint32_t),
|
||||
.value_size = sizeof(struct strobelight_bpf_sample),
|
||||
.max_entries = 1,
|
||||
};
|
||||
|
||||
struct bpf_map_def SEC("maps") strobemeta_cfgs = {
|
||||
.type = BPF_MAP_TYPE_PERCPU_ARRAY,
|
||||
.key_size = sizeof(pid_t),
|
||||
.value_size = sizeof(struct strobemeta_cfg),
|
||||
.max_entries = STROBE_MAX_CFGS,
|
||||
};
|
||||
|
||||
/* Type for the dtv. */
|
||||
/* https://github.com/lattera/glibc/blob/master/nptl/sysdeps/x86_64/tls.h#L34 */
|
||||
typedef union dtv {
|
||||
size_t counter;
|
||||
struct {
|
||||
void* val;
|
||||
bool is_static;
|
||||
} pointer;
|
||||
} dtv_t;
|
||||
|
||||
/* Partial definition for tcbhead_t */
|
||||
/* https://github.com/bminor/glibc/blob/master/sysdeps/x86_64/nptl/tls.h#L42 */
|
||||
struct tcbhead {
|
||||
void* tcb;
|
||||
dtv_t* dtv;
|
||||
};
|
||||
|
||||
/*
|
||||
* TLS module/offset information for shared library case.
|
||||
* For x86-64, this is mapped onto two entries in GOT.
|
||||
* For aarch64, this is pointed to by second GOT entry.
|
||||
*/
|
||||
struct tls_index {
|
||||
uint64_t module;
|
||||
uint64_t offset;
|
||||
};
|
||||
|
||||
static inline __attribute__((always_inline))
|
||||
void *calc_location(struct strobe_value_loc *loc, void *tls_base)
|
||||
{
|
||||
/*
|
||||
* tls_mode value is:
|
||||
* - -1 (TLS_NOT_SET), if no metavar is present;
|
||||
* - 0 (TLS_LOCAL_EXEC), if metavar uses Local Executable mode of TLS
|
||||
* (offset from fs:0 for x86-64 or tpidr_el0 for aarch64);
|
||||
* - 1 (TLS_IMM_EXEC), if metavar uses Immediate Executable mode of TLS;
|
||||
* - 2 (TLS_GENERAL_DYN), if metavar uses General Dynamic mode of TLS;
|
||||
* This schema allows to use something like:
|
||||
* (tls_mode + 1) * (tls_base + offset)
|
||||
* to get NULL for "no metavar" location, or correct pointer for local
|
||||
* executable mode without doing extra ifs.
|
||||
*/
|
||||
if (loc->tls_mode <= TLS_LOCAL_EXEC) {
|
||||
/* static executable is simple, we just have offset from
|
||||
* tls_base */
|
||||
void *addr = tls_base + loc->offset;
|
||||
/* multiply by (tls_mode + 1) to get NULL, if we have no
|
||||
* metavar in this slot */
|
||||
return (void *)((loc->tls_mode + 1) * (int64_t)addr);
|
||||
}
|
||||
/*
|
||||
* Other modes are more complicated, we need to jump through few hoops.
|
||||
*
|
||||
* For immediate executable mode (currently supported only for aarch64):
|
||||
* - loc->offset is pointing to a GOT entry containing fixed offset
|
||||
* relative to tls_base;
|
||||
*
|
||||
* For general dynamic mode:
|
||||
* - loc->offset is pointing to a beginning of double GOT entries;
|
||||
* - (for aarch64 only) second entry points to tls_index_t struct;
|
||||
* - (for x86-64 only) two GOT entries are already tls_index_t;
|
||||
* - tls_index_t->module is used to find start of TLS section in
|
||||
* which variable resides;
|
||||
* - tls_index_t->offset provides offset within that TLS section,
|
||||
* pointing to value of variable.
|
||||
*/
|
||||
struct tls_index tls_index;
|
||||
dtv_t *dtv;
|
||||
void *tls_ptr;
|
||||
|
||||
bpf_probe_read(&tls_index, sizeof(struct tls_index),
|
||||
(void *)loc->offset);
|
||||
/* valid module index is always positive */
|
||||
if (tls_index.module > 0) {
|
||||
/* dtv = ((struct tcbhead *)tls_base)->dtv[tls_index.module] */
|
||||
bpf_probe_read(&dtv, sizeof(dtv),
|
||||
&((struct tcbhead *)tls_base)->dtv);
|
||||
dtv += tls_index.module;
|
||||
} else {
|
||||
dtv = NULL;
|
||||
}
|
||||
bpf_probe_read(&tls_ptr, sizeof(void *), dtv);
|
||||
/* if pointer has (void *)-1 value, then TLS wasn't initialized yet */
|
||||
return tls_ptr && tls_ptr != (void *)-1
|
||||
? tls_ptr + tls_index.offset
|
||||
: NULL;
|
||||
}
|
||||
|
||||
static inline __attribute__((always_inline))
|
||||
void read_int_var(struct strobemeta_cfg *cfg, size_t idx, void *tls_base,
|
||||
struct strobe_value_generic *value,
|
||||
struct strobemeta_payload *data)
|
||||
{
|
||||
void *location = calc_location(&cfg->int_locs[idx], tls_base);
|
||||
if (!location)
|
||||
return;
|
||||
|
||||
bpf_probe_read(value, sizeof(struct strobe_value_generic), location);
|
||||
data->int_vals[idx] = value->val;
|
||||
if (value->header.len)
|
||||
data->int_vals_set_mask |= (1 << idx);
|
||||
}
|
||||
|
||||
static inline __attribute__((always_inline))
|
||||
uint64_t read_str_var(struct strobemeta_cfg* cfg, size_t idx, void *tls_base,
|
||||
struct strobe_value_generic *value,
|
||||
struct strobemeta_payload *data, void *payload)
|
||||
{
|
||||
void *location;
|
||||
uint32_t len;
|
||||
|
||||
data->str_lens[idx] = 0;
|
||||
location = calc_location(&cfg->str_locs[idx], tls_base);
|
||||
if (!location)
|
||||
return 0;
|
||||
|
||||
bpf_probe_read(value, sizeof(struct strobe_value_generic), location);
|
||||
len = bpf_probe_read_str(payload, STROBE_MAX_STR_LEN, value->ptr);
|
||||
/*
|
||||
* if bpf_probe_read_str returns error (<0), due to casting to
|
||||
* unsinged int, it will become big number, so next check is
|
||||
* sufficient to check for errors AND prove to BPF verifier, that
|
||||
* bpf_probe_read_str won't return anything bigger than
|
||||
* STROBE_MAX_STR_LEN
|
||||
*/
|
||||
if (len > STROBE_MAX_STR_LEN)
|
||||
return 0;
|
||||
|
||||
data->str_lens[idx] = len;
|
||||
return len;
|
||||
}
|
||||
|
||||
static inline __attribute__((always_inline))
|
||||
void *read_map_var(struct strobemeta_cfg *cfg, size_t idx, void *tls_base,
|
||||
struct strobe_value_generic *value,
|
||||
struct strobemeta_payload* data, void *payload)
|
||||
{
|
||||
struct strobe_map_descr* descr = &data->map_descrs[idx];
|
||||
struct strobe_map_raw map;
|
||||
void *location;
|
||||
uint32_t len;
|
||||
int i;
|
||||
|
||||
descr->tag_len = 0; /* presume no tag is set */
|
||||
descr->cnt = -1; /* presume no value is set */
|
||||
|
||||
location = calc_location(&cfg->map_locs[idx], tls_base);
|
||||
if (!location)
|
||||
return payload;
|
||||
|
||||
bpf_probe_read(value, sizeof(struct strobe_value_generic), location);
|
||||
if (bpf_probe_read(&map, sizeof(struct strobe_map_raw), value->ptr))
|
||||
return payload;
|
||||
|
||||
descr->id = map.id;
|
||||
descr->cnt = map.cnt;
|
||||
if (cfg->req_meta_idx == idx) {
|
||||
data->req_id = map.id;
|
||||
data->req_meta_valid = 1;
|
||||
}
|
||||
|
||||
len = bpf_probe_read_str(payload, STROBE_MAX_STR_LEN, map.tag);
|
||||
if (len <= STROBE_MAX_STR_LEN) {
|
||||
descr->tag_len = len;
|
||||
payload += len;
|
||||
}
|
||||
|
||||
#ifdef NO_UNROLL
|
||||
#pragma clang loop unroll(disable)
|
||||
#else
|
||||
#pragma unroll
|
||||
#endif
|
||||
for (int i = 0; i < STROBE_MAX_MAP_ENTRIES && i < map.cnt; ++i) {
|
||||
descr->key_lens[i] = 0;
|
||||
len = bpf_probe_read_str(payload, STROBE_MAX_STR_LEN,
|
||||
map.entries[i].key);
|
||||
if (len <= STROBE_MAX_STR_LEN) {
|
||||
descr->key_lens[i] = len;
|
||||
payload += len;
|
||||
}
|
||||
descr->val_lens[i] = 0;
|
||||
len = bpf_probe_read_str(payload, STROBE_MAX_STR_LEN,
|
||||
map.entries[i].val);
|
||||
if (len <= STROBE_MAX_STR_LEN) {
|
||||
descr->val_lens[i] = len;
|
||||
payload += len;
|
||||
}
|
||||
}
|
||||
|
||||
return payload;
|
||||
}
|
||||
|
||||
/*
|
||||
* read_strobe_meta returns NULL, if no metadata was read; otherwise returns
|
||||
* pointer to *right after* payload ends
|
||||
*/
|
||||
static inline __attribute__((always_inline))
|
||||
void *read_strobe_meta(struct task_struct* task,
|
||||
struct strobemeta_payload* data) {
|
||||
pid_t pid = bpf_get_current_pid_tgid() >> 32;
|
||||
struct strobe_value_generic value = {0};
|
||||
struct strobemeta_cfg *cfg;
|
||||
void *tls_base, *payload;
|
||||
|
||||
cfg = bpf_map_lookup_elem(&strobemeta_cfgs, &pid);
|
||||
if (!cfg)
|
||||
return NULL;
|
||||
|
||||
data->int_vals_set_mask = 0;
|
||||
data->req_meta_valid = 0;
|
||||
payload = data->payload;
|
||||
/*
|
||||
* we don't have struct task_struct definition, it should be:
|
||||
* tls_base = (void *)task->thread.fsbase;
|
||||
*/
|
||||
tls_base = (void *)task;
|
||||
|
||||
#ifdef NO_UNROLL
|
||||
#pragma clang loop unroll(disable)
|
||||
#else
|
||||
#pragma unroll
|
||||
#endif
|
||||
for (int i = 0; i < STROBE_MAX_INTS; ++i) {
|
||||
read_int_var(cfg, i, tls_base, &value, data);
|
||||
}
|
||||
#ifdef NO_UNROLL
|
||||
#pragma clang loop unroll(disable)
|
||||
#else
|
||||
#pragma unroll
|
||||
#endif
|
||||
for (int i = 0; i < STROBE_MAX_STRS; ++i) {
|
||||
payload += read_str_var(cfg, i, tls_base, &value, data, payload);
|
||||
}
|
||||
#ifdef NO_UNROLL
|
||||
#pragma clang loop unroll(disable)
|
||||
#else
|
||||
#pragma unroll
|
||||
#endif
|
||||
for (int i = 0; i < STROBE_MAX_MAPS; ++i) {
|
||||
payload = read_map_var(cfg, i, tls_base, &value, data, payload);
|
||||
}
|
||||
/*
|
||||
* return pointer right after end of payload, so it's possible to
|
||||
* calculate exact amount of useful data that needs to be sent
|
||||
*/
|
||||
return payload;
|
||||
}
|
||||
|
||||
SEC("raw_tracepoint/kfree_skb")
|
||||
int on_event(struct pt_regs *ctx) {
|
||||
pid_t pid = bpf_get_current_pid_tgid() >> 32;
|
||||
struct strobelight_bpf_sample* sample;
|
||||
struct task_struct *task;
|
||||
uint32_t zero = 0;
|
||||
uint64_t ktime_ns;
|
||||
void *sample_end;
|
||||
|
||||
sample = bpf_map_lookup_elem(&sample_heap, &zero);
|
||||
if (!sample)
|
||||
return 0; /* this will never happen */
|
||||
|
||||
sample->pid = pid;
|
||||
bpf_get_current_comm(&sample->comm, TASK_COMM_LEN);
|
||||
ktime_ns = bpf_ktime_get_ns();
|
||||
sample->ktime = ktime_ns;
|
||||
|
||||
task = (struct task_struct *)bpf_get_current_task();
|
||||
sample_end = read_strobe_meta(task, &sample->metadata);
|
||||
sample->has_meta = sample_end != NULL;
|
||||
sample_end = sample_end ? : &sample->metadata;
|
||||
|
||||
if ((ktime_ns >> STACK_TABLE_EPOCH_SHIFT) & 1) {
|
||||
sample->kernel_stack_id = bpf_get_stackid(ctx, &stacks_1, 0);
|
||||
sample->user_stack_id = bpf_get_stackid(ctx, &stacks_1, BPF_F_USER_STACK);
|
||||
} else {
|
||||
sample->kernel_stack_id = bpf_get_stackid(ctx, &stacks_0, 0);
|
||||
sample->user_stack_id = bpf_get_stackid(ctx, &stacks_0, BPF_F_USER_STACK);
|
||||
}
|
||||
|
||||
uint64_t sample_size = sample_end - (void *)sample;
|
||||
/* should always be true */
|
||||
if (sample_size < sizeof(struct strobelight_bpf_sample))
|
||||
bpf_perf_event_output(ctx, &samples, 0, sample, 1 + sample_size);
|
||||
return 0;
|
||||
}
|
||||
|
||||
char _license[] SEC("license") = "GPL";
|
||||
|
|
@ -0,0 +1,9 @@
|
|||
// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
|
||||
// Copyright (c) 2019 Facebook
|
||||
|
||||
#define STROBE_MAX_INTS 2
|
||||
#define STROBE_MAX_STRS 25
|
||||
#define STROBE_MAX_MAPS 13
|
||||
#define STROBE_MAX_MAP_ENTRIES 20
|
||||
#define NO_UNROLL
|
||||
#include "strobemeta.h"
|
||||
|
|
@ -0,0 +1,9 @@
|
|||
// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
|
||||
// Copyright (c) 2019 Facebook
|
||||
|
||||
#define STROBE_MAX_INTS 2
|
||||
#define STROBE_MAX_STRS 25
|
||||
#define STROBE_MAX_MAPS 30
|
||||
#define STROBE_MAX_MAP_ENTRIES 20
|
||||
#define NO_UNROLL
|
||||
#include "strobemeta.h"
|
||||
|
|
@ -0,0 +1,261 @@
|
|||
#include <stddef.h>
|
||||
#include <inttypes.h>
|
||||
#include <errno.h>
|
||||
#include <linux/seg6_local.h>
|
||||
#include <linux/bpf.h>
|
||||
#include "bpf_helpers.h"
|
||||
#include "bpf_endian.h"
|
||||
|
||||
/* Packet parsing state machine helpers. */
|
||||
#define cursor_advance(_cursor, _len) \
|
||||
({ void *_tmp = _cursor; _cursor += _len; _tmp; })
|
||||
|
||||
#define SR6_FLAG_ALERT (1 << 4)
|
||||
|
||||
#define htonll(x) ((bpf_htonl(1)) == 1 ? (x) : ((uint64_t)bpf_htonl((x) & \
|
||||
0xFFFFFFFF) << 32) | bpf_htonl((x) >> 32))
|
||||
#define ntohll(x) ((bpf_ntohl(1)) == 1 ? (x) : ((uint64_t)bpf_ntohl((x) & \
|
||||
0xFFFFFFFF) << 32) | bpf_ntohl((x) >> 32))
|
||||
#define BPF_PACKET_HEADER __attribute__((packed))
|
||||
|
||||
struct ip6_t {
|
||||
unsigned int ver:4;
|
||||
unsigned int priority:8;
|
||||
unsigned int flow_label:20;
|
||||
unsigned short payload_len;
|
||||
unsigned char next_header;
|
||||
unsigned char hop_limit;
|
||||
unsigned long long src_hi;
|
||||
unsigned long long src_lo;
|
||||
unsigned long long dst_hi;
|
||||
unsigned long long dst_lo;
|
||||
} BPF_PACKET_HEADER;
|
||||
|
||||
struct ip6_addr_t {
|
||||
unsigned long long hi;
|
||||
unsigned long long lo;
|
||||
} BPF_PACKET_HEADER;
|
||||
|
||||
struct ip6_srh_t {
|
||||
unsigned char nexthdr;
|
||||
unsigned char hdrlen;
|
||||
unsigned char type;
|
||||
unsigned char segments_left;
|
||||
unsigned char first_segment;
|
||||
unsigned char flags;
|
||||
unsigned short tag;
|
||||
|
||||
struct ip6_addr_t segments[0];
|
||||
} BPF_PACKET_HEADER;
|
||||
|
||||
struct sr6_tlv_t {
|
||||
unsigned char type;
|
||||
unsigned char len;
|
||||
unsigned char value[0];
|
||||
} BPF_PACKET_HEADER;
|
||||
|
||||
static __attribute__((always_inline)) struct ip6_srh_t *get_srh(struct __sk_buff *skb)
|
||||
{
|
||||
void *cursor, *data_end;
|
||||
struct ip6_srh_t *srh;
|
||||
struct ip6_t *ip;
|
||||
uint8_t *ipver;
|
||||
|
||||
data_end = (void *)(long)skb->data_end;
|
||||
cursor = (void *)(long)skb->data;
|
||||
ipver = (uint8_t *)cursor;
|
||||
|
||||
if ((void *)ipver + sizeof(*ipver) > data_end)
|
||||
return NULL;
|
||||
|
||||
if ((*ipver >> 4) != 6)
|
||||
return NULL;
|
||||
|
||||
ip = cursor_advance(cursor, sizeof(*ip));
|
||||
if ((void *)ip + sizeof(*ip) > data_end)
|
||||
return NULL;
|
||||
|
||||
if (ip->next_header != 43)
|
||||
return NULL;
|
||||
|
||||
srh = cursor_advance(cursor, sizeof(*srh));
|
||||
if ((void *)srh + sizeof(*srh) > data_end)
|
||||
return NULL;
|
||||
|
||||
if (srh->type != 4)
|
||||
return NULL;
|
||||
|
||||
return srh;
|
||||
}
|
||||
|
||||
static __attribute__((always_inline))
|
||||
int update_tlv_pad(struct __sk_buff *skb, uint32_t new_pad,
|
||||
uint32_t old_pad, uint32_t pad_off)
|
||||
{
|
||||
int err;
|
||||
|
||||
if (new_pad != old_pad) {
|
||||
err = bpf_lwt_seg6_adjust_srh(skb, pad_off,
|
||||
(int) new_pad - (int) old_pad);
|
||||
if (err)
|
||||
return err;
|
||||
}
|
||||
|
||||
if (new_pad > 0) {
|
||||
char pad_tlv_buf[16] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0};
|
||||
struct sr6_tlv_t *pad_tlv = (struct sr6_tlv_t *) pad_tlv_buf;
|
||||
|
||||
pad_tlv->type = SR6_TLV_PADDING;
|
||||
pad_tlv->len = new_pad - 2;
|
||||
|
||||
err = bpf_lwt_seg6_store_bytes(skb, pad_off,
|
||||
(void *)pad_tlv_buf, new_pad);
|
||||
if (err)
|
||||
return err;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static __attribute__((always_inline))
|
||||
int is_valid_tlv_boundary(struct __sk_buff *skb, struct ip6_srh_t *srh,
|
||||
uint32_t *tlv_off, uint32_t *pad_size,
|
||||
uint32_t *pad_off)
|
||||
{
|
||||
uint32_t srh_off, cur_off;
|
||||
int offset_valid = 0;
|
||||
int err;
|
||||
|
||||
srh_off = (char *)srh - (char *)(long)skb->data;
|
||||
// cur_off = end of segments, start of possible TLVs
|
||||
cur_off = srh_off + sizeof(*srh) +
|
||||
sizeof(struct ip6_addr_t) * (srh->first_segment + 1);
|
||||
|
||||
*pad_off = 0;
|
||||
|
||||
// we can only go as far as ~10 TLVs due to the BPF max stack size
|
||||
#pragma clang loop unroll(disable)
|
||||
for (int i = 0; i < 100; i++) {
|
||||
struct sr6_tlv_t tlv;
|
||||
|
||||
if (cur_off == *tlv_off)
|
||||
offset_valid = 1;
|
||||
|
||||
if (cur_off >= srh_off + ((srh->hdrlen + 1) << 3))
|
||||
break;
|
||||
|
||||
err = bpf_skb_load_bytes(skb, cur_off, &tlv, sizeof(tlv));
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
if (tlv.type == SR6_TLV_PADDING) {
|
||||
*pad_size = tlv.len + sizeof(tlv);
|
||||
*pad_off = cur_off;
|
||||
|
||||
if (*tlv_off == srh_off) {
|
||||
*tlv_off = cur_off;
|
||||
offset_valid = 1;
|
||||
}
|
||||
break;
|
||||
|
||||
} else if (tlv.type == SR6_TLV_HMAC) {
|
||||
break;
|
||||
}
|
||||
|
||||
cur_off += sizeof(tlv) + tlv.len;
|
||||
} // we reached the padding or HMAC TLVs, or the end of the SRH
|
||||
|
||||
if (*pad_off == 0)
|
||||
*pad_off = cur_off;
|
||||
|
||||
if (*tlv_off == -1)
|
||||
*tlv_off = cur_off;
|
||||
else if (!offset_valid)
|
||||
return -EINVAL;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static __attribute__((always_inline))
|
||||
int add_tlv(struct __sk_buff *skb, struct ip6_srh_t *srh, uint32_t tlv_off,
|
||||
struct sr6_tlv_t *itlv, uint8_t tlv_size)
|
||||
{
|
||||
uint32_t srh_off = (char *)srh - (char *)(long)skb->data;
|
||||
uint8_t len_remaining, new_pad;
|
||||
uint32_t pad_off = 0;
|
||||
uint32_t pad_size = 0;
|
||||
uint32_t partial_srh_len;
|
||||
int err;
|
||||
|
||||
if (tlv_off != -1)
|
||||
tlv_off += srh_off;
|
||||
|
||||
if (itlv->type == SR6_TLV_PADDING || itlv->type == SR6_TLV_HMAC)
|
||||
return -EINVAL;
|
||||
|
||||
err = is_valid_tlv_boundary(skb, srh, &tlv_off, &pad_size, &pad_off);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
err = bpf_lwt_seg6_adjust_srh(skb, tlv_off, sizeof(*itlv) + itlv->len);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
err = bpf_lwt_seg6_store_bytes(skb, tlv_off, (void *)itlv, tlv_size);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
// the following can't be moved inside update_tlv_pad because the
|
||||
// bpf verifier has some issues with it
|
||||
pad_off += sizeof(*itlv) + itlv->len;
|
||||
partial_srh_len = pad_off - srh_off;
|
||||
len_remaining = partial_srh_len % 8;
|
||||
new_pad = 8 - len_remaining;
|
||||
|
||||
if (new_pad == 1) // cannot pad for 1 byte only
|
||||
new_pad = 9;
|
||||
else if (new_pad == 8)
|
||||
new_pad = 0;
|
||||
|
||||
return update_tlv_pad(skb, new_pad, pad_size, pad_off);
|
||||
}
|
||||
|
||||
// Add an Egress TLV fc00::4, add the flag A,
|
||||
// and apply End.X action to fc42::1
|
||||
SEC("lwt_seg6local")
|
||||
int __add_egr_x(struct __sk_buff *skb)
|
||||
{
|
||||
unsigned long long hi = 0xfc42000000000000;
|
||||
unsigned long long lo = 0x1;
|
||||
struct ip6_srh_t *srh = get_srh(skb);
|
||||
uint8_t new_flags = SR6_FLAG_ALERT;
|
||||
struct ip6_addr_t addr;
|
||||
int err, offset;
|
||||
|
||||
if (srh == NULL)
|
||||
return BPF_DROP;
|
||||
|
||||
uint8_t tlv[20] = {2, 18, 0, 0, 0xfd, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
|
||||
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x4};
|
||||
|
||||
err = add_tlv(skb, srh, (srh->hdrlen+1) << 3,
|
||||
(struct sr6_tlv_t *)&tlv, 20);
|
||||
if (err)
|
||||
return BPF_DROP;
|
||||
|
||||
offset = sizeof(struct ip6_t) + offsetof(struct ip6_srh_t, flags);
|
||||
err = bpf_lwt_seg6_store_bytes(skb, offset,
|
||||
(void *)&new_flags, sizeof(new_flags));
|
||||
if (err)
|
||||
return BPF_DROP;
|
||||
|
||||
addr.lo = htonll(lo);
|
||||
addr.hi = htonll(hi);
|
||||
err = bpf_lwt_seg6_action(skb, SEG6_LOCAL_ACTION_END_X,
|
||||
(void *)&addr, sizeof(addr));
|
||||
if (err)
|
||||
return BPF_DROP;
|
||||
return BPF_REDIRECT;
|
||||
}
|
||||
char __license[] SEC("license") = "GPL";
|
||||
|
|
@ -0,0 +1,71 @@
|
|||
// SPDX-License-Identifier: GPL-2.0
|
||||
// Copyright (c) 2019 Facebook
|
||||
|
||||
#include <stdint.h>
|
||||
#include <string.h>
|
||||
|
||||
#include <linux/stddef.h>
|
||||
#include <linux/bpf.h>
|
||||
|
||||
#include "bpf_helpers.h"
|
||||
|
||||
#ifndef ARRAY_SIZE
|
||||
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
|
||||
#endif
|
||||
|
||||
/* tcp_mem sysctl has only 3 ints, but this test is doing TCP_MEM_LOOPS */
|
||||
#define TCP_MEM_LOOPS 28 /* because 30 doesn't fit into 512 bytes of stack */
|
||||
#define MAX_ULONG_STR_LEN 7
|
||||
#define MAX_VALUE_STR_LEN (TCP_MEM_LOOPS * MAX_ULONG_STR_LEN)
|
||||
|
||||
static __always_inline int is_tcp_mem(struct bpf_sysctl *ctx)
|
||||
{
|
||||
volatile char tcp_mem_name[] = "net/ipv4/tcp_mem/very_very_very_very_long_pointless_string";
|
||||
unsigned char i;
|
||||
char name[64];
|
||||
int ret;
|
||||
|
||||
memset(name, 0, sizeof(name));
|
||||
ret = bpf_sysctl_get_name(ctx, name, sizeof(name), 0);
|
||||
if (ret < 0 || ret != sizeof(tcp_mem_name) - 1)
|
||||
return 0;
|
||||
|
||||
#pragma clang loop unroll(disable)
|
||||
for (i = 0; i < sizeof(tcp_mem_name); ++i)
|
||||
if (name[i] != tcp_mem_name[i])
|
||||
return 0;
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
SEC("cgroup/sysctl")
|
||||
int sysctl_tcp_mem(struct bpf_sysctl *ctx)
|
||||
{
|
||||
unsigned long tcp_mem[TCP_MEM_LOOPS] = {};
|
||||
char value[MAX_VALUE_STR_LEN];
|
||||
unsigned char i, off = 0;
|
||||
int ret;
|
||||
|
||||
if (ctx->write)
|
||||
return 0;
|
||||
|
||||
if (!is_tcp_mem(ctx))
|
||||
return 0;
|
||||
|
||||
ret = bpf_sysctl_get_current_value(ctx, value, MAX_VALUE_STR_LEN);
|
||||
if (ret < 0 || ret >= MAX_VALUE_STR_LEN)
|
||||
return 0;
|
||||
|
||||
#pragma clang loop unroll(disable)
|
||||
for (i = 0; i < ARRAY_SIZE(tcp_mem); ++i) {
|
||||
ret = bpf_strtoul(value + off, MAX_ULONG_STR_LEN, 0,
|
||||
tcp_mem + i);
|
||||
if (ret <= 0 || ret > MAX_ULONG_STR_LEN)
|
||||
return 0;
|
||||
off += ret & MAX_ULONG_STR_LEN;
|
||||
}
|
||||
|
||||
return tcp_mem[0] < tcp_mem[1] && tcp_mem[1] < tcp_mem[2];
|
||||
}
|
||||
|
||||
char _license[] SEC("license") = "GPL";
|
||||
|
|
@ -0,0 +1,72 @@
|
|||
// SPDX-License-Identifier: GPL-2.0
|
||||
// Copyright (c) 2019 Facebook
|
||||
|
||||
#include <stdint.h>
|
||||
#include <string.h>
|
||||
|
||||
#include <linux/stddef.h>
|
||||
#include <linux/bpf.h>
|
||||
|
||||
#include "bpf_helpers.h"
|
||||
|
||||
#ifndef ARRAY_SIZE
|
||||
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
|
||||
#endif
|
||||
|
||||
/* tcp_mem sysctl has only 3 ints, but this test is doing TCP_MEM_LOOPS */
|
||||
#define TCP_MEM_LOOPS 20 /* because 30 doesn't fit into 512 bytes of stack */
|
||||
#define MAX_ULONG_STR_LEN 7
|
||||
#define MAX_VALUE_STR_LEN (TCP_MEM_LOOPS * MAX_ULONG_STR_LEN)
|
||||
|
||||
static __attribute__((noinline)) int is_tcp_mem(struct bpf_sysctl *ctx)
|
||||
{
|
||||
volatile char tcp_mem_name[] = "net/ipv4/tcp_mem/very_very_very_very_long_pointless_string_to_stress_byte_loop";
|
||||
unsigned char i;
|
||||
char name[64];
|
||||
int ret;
|
||||
|
||||
memset(name, 0, sizeof(name));
|
||||
ret = bpf_sysctl_get_name(ctx, name, sizeof(name), 0);
|
||||
if (ret < 0 || ret != sizeof(tcp_mem_name) - 1)
|
||||
return 0;
|
||||
|
||||
#pragma clang loop unroll(disable)
|
||||
for (i = 0; i < sizeof(tcp_mem_name); ++i)
|
||||
if (name[i] != tcp_mem_name[i])
|
||||
return 0;
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
|
||||
SEC("cgroup/sysctl")
|
||||
int sysctl_tcp_mem(struct bpf_sysctl *ctx)
|
||||
{
|
||||
unsigned long tcp_mem[TCP_MEM_LOOPS] = {};
|
||||
char value[MAX_VALUE_STR_LEN];
|
||||
unsigned char i, off = 0;
|
||||
int ret;
|
||||
|
||||
if (ctx->write)
|
||||
return 0;
|
||||
|
||||
if (!is_tcp_mem(ctx))
|
||||
return 0;
|
||||
|
||||
ret = bpf_sysctl_get_current_value(ctx, value, MAX_VALUE_STR_LEN);
|
||||
if (ret < 0 || ret >= MAX_VALUE_STR_LEN)
|
||||
return 0;
|
||||
|
||||
#pragma clang loop unroll(disable)
|
||||
for (i = 0; i < ARRAY_SIZE(tcp_mem); ++i) {
|
||||
ret = bpf_strtoul(value + off, MAX_ULONG_STR_LEN, 0,
|
||||
tcp_mem + i);
|
||||
if (ret <= 0 || ret > MAX_ULONG_STR_LEN)
|
||||
return 0;
|
||||
off += ret & MAX_ULONG_STR_LEN;
|
||||
}
|
||||
|
||||
return tcp_mem[0] < tcp_mem[1] && tcp_mem[1] < tcp_mem[2];
|
||||
}
|
||||
|
||||
char _license[] SEC("license") = "GPL";
|
||||
|
|
@ -0,0 +1,231 @@
|
|||
// SPDX-License-Identifier: GPL-2.0
|
||||
// Copyright (c) 2019 Facebook
|
||||
#include <stddef.h>
|
||||
#include <string.h>
|
||||
#include <linux/bpf.h>
|
||||
#include <linux/if_ether.h>
|
||||
#include <linux/if_packet.h>
|
||||
#include <linux/ip.h>
|
||||
#include <linux/ipv6.h>
|
||||
#include <linux/in.h>
|
||||
#include <linux/udp.h>
|
||||
#include <linux/tcp.h>
|
||||
#include <linux/pkt_cls.h>
|
||||
#include <sys/socket.h>
|
||||
#include "bpf_helpers.h"
|
||||
#include "bpf_endian.h"
|
||||
#include "test_iptunnel_common.h"
|
||||
|
||||
int _version SEC("version") = 1;
|
||||
|
||||
struct bpf_map_def SEC("maps") rxcnt = {
|
||||
.type = BPF_MAP_TYPE_PERCPU_ARRAY,
|
||||
.key_size = sizeof(__u32),
|
||||
.value_size = sizeof(__u64),
|
||||
.max_entries = 256,
|
||||
};
|
||||
|
||||
struct bpf_map_def SEC("maps") vip2tnl = {
|
||||
.type = BPF_MAP_TYPE_HASH,
|
||||
.key_size = sizeof(struct vip),
|
||||
.value_size = sizeof(struct iptnl_info),
|
||||
.max_entries = MAX_IPTNL_ENTRIES,
|
||||
};
|
||||
|
||||
static __always_inline void count_tx(__u32 protocol)
|
||||
{
|
||||
__u64 *rxcnt_count;
|
||||
|
||||
rxcnt_count = bpf_map_lookup_elem(&rxcnt, &protocol);
|
||||
if (rxcnt_count)
|
||||
*rxcnt_count += 1;
|
||||
}
|
||||
|
||||
static __always_inline int get_dport(void *trans_data, void *data_end,
|
||||
__u8 protocol)
|
||||
{
|
||||
struct tcphdr *th;
|
||||
struct udphdr *uh;
|
||||
|
||||
switch (protocol) {
|
||||
case IPPROTO_TCP:
|
||||
th = (struct tcphdr *)trans_data;
|
||||
if (th + 1 > data_end)
|
||||
return -1;
|
||||
return th->dest;
|
||||
case IPPROTO_UDP:
|
||||
uh = (struct udphdr *)trans_data;
|
||||
if (uh + 1 > data_end)
|
||||
return -1;
|
||||
return uh->dest;
|
||||
default:
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
||||
static __always_inline void set_ethhdr(struct ethhdr *new_eth,
|
||||
const struct ethhdr *old_eth,
|
||||
const struct iptnl_info *tnl,
|
||||
__be16 h_proto)
|
||||
{
|
||||
memcpy(new_eth->h_source, old_eth->h_dest, sizeof(new_eth->h_source));
|
||||
memcpy(new_eth->h_dest, tnl->dmac, sizeof(new_eth->h_dest));
|
||||
new_eth->h_proto = h_proto;
|
||||
}
|
||||
|
||||
static __always_inline int handle_ipv4(struct xdp_md *xdp)
|
||||
{
|
||||
void *data_end = (void *)(long)xdp->data_end;
|
||||
void *data = (void *)(long)xdp->data;
|
||||
struct iptnl_info *tnl;
|
||||
struct ethhdr *new_eth;
|
||||
struct ethhdr *old_eth;
|
||||
struct iphdr *iph = data + sizeof(struct ethhdr);
|
||||
__u16 *next_iph;
|
||||
__u16 payload_len;
|
||||
struct vip vip = {};
|
||||
int dport;
|
||||
__u32 csum = 0;
|
||||
int i;
|
||||
|
||||
if (iph + 1 > data_end)
|
||||
return XDP_DROP;
|
||||
|
||||
dport = get_dport(iph + 1, data_end, iph->protocol);
|
||||
if (dport == -1)
|
||||
return XDP_DROP;
|
||||
|
||||
vip.protocol = iph->protocol;
|
||||
vip.family = AF_INET;
|
||||
vip.daddr.v4 = iph->daddr;
|
||||
vip.dport = dport;
|
||||
payload_len = bpf_ntohs(iph->tot_len);
|
||||
|
||||
tnl = bpf_map_lookup_elem(&vip2tnl, &vip);
|
||||
/* It only does v4-in-v4 */
|
||||
if (!tnl || tnl->family != AF_INET)
|
||||
return XDP_PASS;
|
||||
|
||||
if (bpf_xdp_adjust_head(xdp, 0 - (int)sizeof(struct iphdr)))
|
||||
return XDP_DROP;
|
||||
|
||||
data = (void *)(long)xdp->data;
|
||||
data_end = (void *)(long)xdp->data_end;
|
||||
|
||||
new_eth = data;
|
||||
iph = data + sizeof(*new_eth);
|
||||
old_eth = data + sizeof(*iph);
|
||||
|
||||
if (new_eth + 1 > data_end ||
|
||||
old_eth + 1 > data_end ||
|
||||
iph + 1 > data_end)
|
||||
return XDP_DROP;
|
||||
|
||||
set_ethhdr(new_eth, old_eth, tnl, bpf_htons(ETH_P_IP));
|
||||
|
||||
iph->version = 4;
|
||||
iph->ihl = sizeof(*iph) >> 2;
|
||||
iph->frag_off = 0;
|
||||
iph->protocol = IPPROTO_IPIP;
|
||||
iph->check = 0;
|
||||
iph->tos = 0;
|
||||
iph->tot_len = bpf_htons(payload_len + sizeof(*iph));
|
||||
iph->daddr = tnl->daddr.v4;
|
||||
iph->saddr = tnl->saddr.v4;
|
||||
iph->ttl = 8;
|
||||
|
||||
next_iph = (__u16 *)iph;
|
||||
#pragma clang loop unroll(disable)
|
||||
for (i = 0; i < sizeof(*iph) >> 1; i++)
|
||||
csum += *next_iph++;
|
||||
|
||||
iph->check = ~((csum & 0xffff) + (csum >> 16));
|
||||
|
||||
count_tx(vip.protocol);
|
||||
|
||||
return XDP_TX;
|
||||
}
|
||||
|
||||
static __always_inline int handle_ipv6(struct xdp_md *xdp)
|
||||
{
|
||||
void *data_end = (void *)(long)xdp->data_end;
|
||||
void *data = (void *)(long)xdp->data;
|
||||
struct iptnl_info *tnl;
|
||||
struct ethhdr *new_eth;
|
||||
struct ethhdr *old_eth;
|
||||
struct ipv6hdr *ip6h = data + sizeof(struct ethhdr);
|
||||
__u16 payload_len;
|
||||
struct vip vip = {};
|
||||
int dport;
|
||||
|
||||
if (ip6h + 1 > data_end)
|
||||
return XDP_DROP;
|
||||
|
||||
dport = get_dport(ip6h + 1, data_end, ip6h->nexthdr);
|
||||
if (dport == -1)
|
||||
return XDP_DROP;
|
||||
|
||||
vip.protocol = ip6h->nexthdr;
|
||||
vip.family = AF_INET6;
|
||||
memcpy(vip.daddr.v6, ip6h->daddr.s6_addr32, sizeof(vip.daddr));
|
||||
vip.dport = dport;
|
||||
payload_len = ip6h->payload_len;
|
||||
|
||||
tnl = bpf_map_lookup_elem(&vip2tnl, &vip);
|
||||
/* It only does v6-in-v6 */
|
||||
if (!tnl || tnl->family != AF_INET6)
|
||||
return XDP_PASS;
|
||||
|
||||
if (bpf_xdp_adjust_head(xdp, 0 - (int)sizeof(struct ipv6hdr)))
|
||||
return XDP_DROP;
|
||||
|
||||
data = (void *)(long)xdp->data;
|
||||
data_end = (void *)(long)xdp->data_end;
|
||||
|
||||
new_eth = data;
|
||||
ip6h = data + sizeof(*new_eth);
|
||||
old_eth = data + sizeof(*ip6h);
|
||||
|
||||
if (new_eth + 1 > data_end || old_eth + 1 > data_end ||
|
||||
ip6h + 1 > data_end)
|
||||
return XDP_DROP;
|
||||
|
||||
set_ethhdr(new_eth, old_eth, tnl, bpf_htons(ETH_P_IPV6));
|
||||
|
||||
ip6h->version = 6;
|
||||
ip6h->priority = 0;
|
||||
memset(ip6h->flow_lbl, 0, sizeof(ip6h->flow_lbl));
|
||||
ip6h->payload_len = bpf_htons(bpf_ntohs(payload_len) + sizeof(*ip6h));
|
||||
ip6h->nexthdr = IPPROTO_IPV6;
|
||||
ip6h->hop_limit = 8;
|
||||
memcpy(ip6h->saddr.s6_addr32, tnl->saddr.v6, sizeof(tnl->saddr.v6));
|
||||
memcpy(ip6h->daddr.s6_addr32, tnl->daddr.v6, sizeof(tnl->daddr.v6));
|
||||
|
||||
count_tx(vip.protocol);
|
||||
|
||||
return XDP_TX;
|
||||
}
|
||||
|
||||
SEC("xdp_tx_iptunnel")
|
||||
int _xdp_tx_iptunnel(struct xdp_md *xdp)
|
||||
{
|
||||
void *data_end = (void *)(long)xdp->data_end;
|
||||
void *data = (void *)(long)xdp->data;
|
||||
struct ethhdr *eth = data;
|
||||
__u16 h_proto;
|
||||
|
||||
if (eth + 1 > data_end)
|
||||
return XDP_DROP;
|
||||
|
||||
h_proto = eth->h_proto;
|
||||
|
||||
if (h_proto == bpf_htons(ETH_P_IP))
|
||||
return handle_ipv4(xdp);
|
||||
else if (h_proto == bpf_htons(ETH_P_IPV6))
|
||||
|
||||
return handle_ipv6(xdp);
|
||||
else
|
||||
return XDP_DROP;
|
||||
}
|
||||
|
||||
char _license[] SEC("license") = "GPL";
|
||||
Loading…
Reference in New Issue