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bcc/bcc-0.24.0-C9S-remove-ksnoop.patch

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Rebase to the latest version Rebase bcc to v0.24 and fix cmake build Resolves: rhbz#2061758 Resolves: rhbz#2061051 Signed-off-by: Jerome Marchand <jmarchan@redhat.com>
2022-05-05 10:19:56 +00:00
From 43a991ffa59acc3d941ef95bb1f20df451a484d8 Mon Sep 17 00:00:00 2001
From: Jerome Marchand <jmarchan@redhat.com>
Date: Wed, 20 Apr 2022 12:42:13 +0200
Subject: [PATCH] C9S: remove ksnoop
ksnoop need a more recent libbpf that currently provided on c9s/RHEL 9.
Signed-off-by: Jerome Marchand <jmarchan@redhat.com>
---
libbpf-tools/Makefile | 1 -
libbpf-tools/ksnoop.bpf.c | 460 -----------------
libbpf-tools/ksnoop.c | 1013 -------------------------------------
libbpf-tools/ksnoop.h | 123 -----
man/man8/ksnoop.8 | 298 -----------
5 files changed, 1895 deletions(-)
delete mode 100644 libbpf-tools/ksnoop.bpf.c
delete mode 100644 libbpf-tools/ksnoop.c
delete mode 100644 libbpf-tools/ksnoop.h
delete mode 100644 man/man8/ksnoop.8
diff --git a/libbpf-tools/Makefile b/libbpf-tools/Makefile
index 39af95ec..d84e4424 100644
--- a/libbpf-tools/Makefile
+++ b/libbpf-tools/Makefile
@@ -38,7 +38,6 @@ APPS = \
gethostlatency \
hardirqs \
klockstat \
- ksnoop \
llcstat \
mountsnoop \
numamove \
diff --git a/libbpf-tools/ksnoop.bpf.c b/libbpf-tools/ksnoop.bpf.c
deleted file mode 100644
index 51dfe572..00000000
--- a/libbpf-tools/ksnoop.bpf.c
+++ /dev/null
@@ -1,460 +0,0 @@
-/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
-/* Copyright (c) 2021, Oracle and/or its affiliates. */
-
-#include "vmlinux.h"
-
-#include <bpf/bpf_helpers.h>
-#include <bpf/bpf_tracing.h>
-#include <bpf/bpf_core_read.h>
-
-#include "ksnoop.h"
-
-/* For kretprobes, the instruction pointer in the struct pt_regs context
- * is the kretprobe_trampoline. We derive the instruction pointer
- * by pushing it onto a function stack on entry and popping it on return.
- *
- * We could use bpf_get_func_ip(), but "stack mode" - where we
- * specify functions "a", "b and "c" and only want to see a trace if "a"
- * calls "b" and "b" calls "c" - utilizes this stack to determine if trace
- * data should be collected.
- */
-#define FUNC_MAX_STACK_DEPTH 16
-/* used to convince verifier we do not stray outside of array bounds */
-#define FUNC_STACK_DEPTH_MASK (FUNC_MAX_STACK_DEPTH - 1)
-
-#ifndef ENOSPC
-#define ENOSPC 28
-#endif
-
-struct func_stack {
- __u64 task;
- __u64 ips[FUNC_MAX_STACK_DEPTH];
- __u8 stack_depth;
-};
-
-#define MAX_TASKS 2048
-
-/* function call stack hashed on a per-task key */
-struct {
- __uint(type, BPF_MAP_TYPE_HASH);
- /* function call stack for functions we are tracing */
- __uint(max_entries, MAX_TASKS);
- __type(key, __u64);
- __type(value, struct func_stack);
-} ksnoop_func_stack SEC(".maps");
-
-/* per-cpu trace info hashed on function address */
-struct {
- __uint(type, BPF_MAP_TYPE_PERCPU_HASH);
- __uint(max_entries, MAX_FUNC_TRACES);
- __type(key, __u64);
- __type(value, struct trace);
-} ksnoop_func_map SEC(".maps");
-
-struct {
- __uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
- __uint(value_size, sizeof(int));
- __uint(key_size, sizeof(int));
-} ksnoop_perf_map SEC(".maps");
-
-static void clear_trace(struct trace *trace)
-{
- __builtin_memset(&trace->trace_data, 0, sizeof(trace->trace_data));
- trace->data_flags = 0;
- trace->buf_len = 0;
-}
-
-static struct trace *get_trace(struct pt_regs *ctx, bool entry)
-{
- __u8 stack_depth, last_stack_depth;
- struct func_stack *func_stack;
- __u64 ip, last_ip = 0, task;
- struct trace *trace;
-
- task = bpf_get_current_task();
-
- func_stack = bpf_map_lookup_elem(&ksnoop_func_stack, &task);
- if (!func_stack) {
- struct func_stack new_stack = { .task = task };
-
- bpf_map_update_elem(&ksnoop_func_stack, &task, &new_stack,
- BPF_NOEXIST);
- func_stack = bpf_map_lookup_elem(&ksnoop_func_stack, &task);
- if (!func_stack)
- return NULL;
- }
-
- stack_depth = func_stack->stack_depth;
- if (stack_depth > FUNC_MAX_STACK_DEPTH)
- return NULL;
-
- if (entry) {
- ip = KSNOOP_IP_FIX(PT_REGS_IP_CORE(ctx));
- if (stack_depth >= FUNC_MAX_STACK_DEPTH - 1)
- return NULL;
- /* verifier doesn't like using "stack_depth - 1" as array index
- * directly.
- */
- last_stack_depth = stack_depth - 1;
- /* get address of last function we called */
- if (last_stack_depth >= 0 &&
- last_stack_depth < FUNC_MAX_STACK_DEPTH)
- last_ip = func_stack->ips[last_stack_depth];
- /* push ip onto stack. return will pop it. */
- func_stack->ips[stack_depth] = ip;
- /* mask used in case bounds checks are optimized out */
- stack_depth = (stack_depth + 1) & FUNC_STACK_DEPTH_MASK;
- func_stack->stack_depth = stack_depth;
- /* rather than zero stack entries on popping, we zero the
- * (stack_depth + 1)'th entry when pushing the current
- * entry. The reason we take this approach is that
- * when tracking the set of functions we returned from,
- * we want the history of functions we returned from to
- * be preserved.
- */
- if (stack_depth < FUNC_MAX_STACK_DEPTH)
- func_stack->ips[stack_depth] = 0;
- } else {
- if (stack_depth == 0 || stack_depth >= FUNC_MAX_STACK_DEPTH)
- return NULL;
- last_stack_depth = stack_depth;
- /* get address of last function we returned from */
- if (last_stack_depth >= 0 &&
- last_stack_depth < FUNC_MAX_STACK_DEPTH)
- last_ip = func_stack->ips[last_stack_depth];
- if (stack_depth > 0) {
- /* logical OR convinces verifier that we don't
- * end up with a < 0 value, translating to 0xff
- * and an outside of map element access.
- */
- stack_depth = (stack_depth - 1) & FUNC_STACK_DEPTH_MASK;
- }
- /* retrieve ip from stack as IP in pt_regs is
- * bpf kretprobe trampoline address.
- */
- if (stack_depth >= 0 && stack_depth < FUNC_MAX_STACK_DEPTH)
- ip = func_stack->ips[stack_depth];
- if (stack_depth >= 0 && stack_depth < FUNC_MAX_STACK_DEPTH)
- func_stack->stack_depth = stack_depth;
- }
-
- trace = bpf_map_lookup_elem(&ksnoop_func_map, &ip);
- if (!trace)
- return NULL;
-
- /* we may stash data on entry since predicates are a mix
- * of entry/return; in such cases, trace->flags specifies
- * KSNOOP_F_STASH, and we will output stashed data on return.
- * If returning, make sure we don't clear our stashed data.
- */
- if (!entry && (trace->flags & KSNOOP_F_STASH)) {
- /* skip clearing trace data */
- if (!(trace->data_flags & KSNOOP_F_STASHED)) {
- /* predicate must have failed */
- return NULL;
- }
- /* skip clearing trace data */
- } else {
- /* clear trace data before starting. */
- clear_trace(trace);
- }
-
- if (entry) {
- /* if in stack mode, check if previous fn matches */
- if (trace->prev_ip && trace->prev_ip != last_ip)
- return NULL;
- /* if tracing intermediate fn in stack of fns, stash data. */
- if (trace->next_ip)
- trace->data_flags |= KSNOOP_F_STASH;
- /* we may stash data on entry since predicates are a mix
- * of entry/return; in such cases, trace->flags specifies
- * KSNOOP_F_STASH, and we will output stashed data on return.
- */
- if (trace->flags & KSNOOP_F_STASH)
- trace->data_flags |= KSNOOP_F_STASH;
- /* otherwise the data is outputted (because we've reached
- * the last fn in the set of fns specified).
- */
- } else {
- /* In stack mode, check if next fn matches the last fn
- * we returned from; i.e. "a" called "b", and now
- * we're at "a", was the last fn we returned from "b"?
- * If so, stash data for later display (when we reach the
- * first fn in the set of stack fns).
- */
- if (trace->next_ip && trace->next_ip != last_ip)
- return NULL;
- if (trace->prev_ip)
- trace->data_flags |= KSNOOP_F_STASH;
- /* If there is no "prev" function, i.e. we are at the
- * first function in a set of stack functions, the trace
- * info is shown (along with any stashed info associated
- * with callers).
- */
- }
- trace->task = task;
- return trace;
-}
-
-static void output_trace(struct pt_regs *ctx, struct trace *trace)
-{
- __u16 trace_len;
-
- if (trace->buf_len == 0)
- goto skip;
-
- /* we may be simply stashing values, and will report later */
- if (trace->data_flags & KSNOOP_F_STASH) {
- trace->data_flags &= ~KSNOOP_F_STASH;
- trace->data_flags |= KSNOOP_F_STASHED;
- return;
- }
- /* we may be outputting earlier stashed data */
- if (trace->data_flags & KSNOOP_F_STASHED)
- trace->data_flags &= ~KSNOOP_F_STASHED;
-
- /* trim perf event size to only contain data we've recorded. */
- trace_len = sizeof(*trace) + trace->buf_len - MAX_TRACE_BUF;
-
- if (trace_len <= sizeof(*trace))
- bpf_perf_event_output(ctx, &ksnoop_perf_map,
- BPF_F_CURRENT_CPU,
- trace, trace_len);
-skip:
- clear_trace(trace);
-}
-
-static void output_stashed_traces(struct pt_regs *ctx,
- struct trace *currtrace,
- bool entry)
-{
- struct func_stack *func_stack;
- struct trace *trace = NULL;
- __u8 i;
- __u64 task = 0;
-
- task = bpf_get_current_task();
- func_stack = bpf_map_lookup_elem(&ksnoop_func_stack, &task);
- if (!func_stack)
- return;
-
- if (entry) {
- /* iterate from bottom to top of stack, outputting stashed
- * data we find. This corresponds to the set of functions
- * we called before the current function.
- */
- for (i = 0;
- i < func_stack->stack_depth - 1 && i < FUNC_MAX_STACK_DEPTH;
- i++) {
- trace = bpf_map_lookup_elem(&ksnoop_func_map,
- &func_stack->ips[i]);
- if (!trace || !(trace->data_flags & KSNOOP_F_STASHED))
- break;
- if (trace->task != task)
- return;
- output_trace(ctx, trace);
- }
- } else {
- /* iterate from top to bottom of stack, outputting stashed
- * data we find. This corresponds to the set of functions
- * that returned prior to the current returning function.
- */
- for (i = FUNC_MAX_STACK_DEPTH; i > 0; i--) {
- __u64 ip;
-
- ip = func_stack->ips[i];
- if (!ip)
- continue;
- trace = bpf_map_lookup_elem(&ksnoop_func_map, &ip);
- if (!trace || !(trace->data_flags & KSNOOP_F_STASHED))
- break;
- if (trace->task != task)
- return;
- output_trace(ctx, trace);
- }
- }
- /* finally output the current trace info */
- output_trace(ctx, currtrace);
-}
-
-static __u64 get_arg(struct pt_regs *ctx, enum arg argnum)
-{
- switch (argnum) {
- case KSNOOP_ARG1:
- return PT_REGS_PARM1_CORE(ctx);
- case KSNOOP_ARG2:
- return PT_REGS_PARM2_CORE(ctx);
- case KSNOOP_ARG3:
- return PT_REGS_PARM3_CORE(ctx);
- case KSNOOP_ARG4:
- return PT_REGS_PARM4_CORE(ctx);
- case KSNOOP_ARG5:
- return PT_REGS_PARM5_CORE(ctx);
- case KSNOOP_RETURN:
- return PT_REGS_RC_CORE(ctx);
- default:
- return 0;
- }
-}
-
-static int ksnoop(struct pt_regs *ctx, bool entry)
-{
- void *data_ptr = NULL;
- struct trace *trace;
- __u64 data;
- __u32 currpid;
- int ret;
- __u8 i;
-
- trace = get_trace(ctx, entry);
- if (!trace)
- return 0;
-
- /* make sure we want events from this pid */
- currpid = bpf_get_current_pid_tgid();
- if (trace->filter_pid && trace->filter_pid != currpid)
- return 0;
- trace->pid = currpid;
-
- trace->cpu = bpf_get_smp_processor_id();
- trace->time = bpf_ktime_get_ns();
-
- trace->data_flags &= ~(KSNOOP_F_ENTRY | KSNOOP_F_RETURN);
- if (entry)
- trace->data_flags |= KSNOOP_F_ENTRY;
- else
- trace->data_flags |= KSNOOP_F_RETURN;
-
-
- for (i = 0; i < MAX_TRACES; i++) {
- struct trace_data *currdata;
- struct value *currtrace;
- char *buf_offset = NULL;
- __u32 tracesize;
-
- currdata = &trace->trace_data[i];
- currtrace = &trace->traces[i];
-
- if ((entry && !base_arg_is_entry(currtrace->base_arg)) ||
- (!entry && base_arg_is_entry(currtrace->base_arg)))
- continue;
-
- /* skip void (unused) trace arguments, ensuring not to
- * skip "void *".
- */
- if (currtrace->type_id == 0 &&
- !(currtrace->flags & KSNOOP_F_PTR))
- continue;
-
- data = get_arg(ctx, currtrace->base_arg);
-
- /* look up member value and read into data field. */
- if (currtrace->flags & KSNOOP_F_MEMBER) {
- if (currtrace->offset)
- data += currtrace->offset;
-
- /* member is a pointer; read it in */
- if (currtrace->flags & KSNOOP_F_PTR) {
- void *dataptr = (void *)data;
-
- ret = bpf_probe_read(&data, sizeof(data),
- dataptr);
- if (ret) {
- currdata->err_type_id =
- currtrace->type_id;
- currdata->err = ret;
- continue;
- }
- currdata->raw_value = data;
- } else if (currtrace->size <=
- sizeof(currdata->raw_value)) {
- /* read member value for predicate comparison */
- bpf_probe_read(&currdata->raw_value,
- currtrace->size,
- (void*)data);
- }
- } else {
- currdata->raw_value = data;
- }
-
- /* simple predicate evaluation: if any predicate fails,
- * skip all tracing for this function.
- */
- if (currtrace->flags & KSNOOP_F_PREDICATE_MASK) {
- bool ok = false;
-
- if (currtrace->flags & KSNOOP_F_PREDICATE_EQ &&
- currdata->raw_value == currtrace->predicate_value)
- ok = true;
-
- if (currtrace->flags & KSNOOP_F_PREDICATE_NOTEQ &&
- currdata->raw_value != currtrace->predicate_value)
- ok = true;
-
- if (currtrace->flags & KSNOOP_F_PREDICATE_GT &&
- currdata->raw_value > currtrace->predicate_value)
- ok = true;
-
- if (currtrace->flags & KSNOOP_F_PREDICATE_LT &&
- currdata->raw_value < currtrace->predicate_value)
- ok = true;
-
- if (!ok) {
- clear_trace(trace);
- return 0;
- }
- }
-
- if (currtrace->flags & (KSNOOP_F_PTR | KSNOOP_F_MEMBER))
- data_ptr = (void *)data;
- else
- data_ptr = &data;
-
- if (trace->buf_len + MAX_TRACE_DATA >= MAX_TRACE_BUF)
- break;
-
- buf_offset = &trace->buf[trace->buf_len];
- if (buf_offset > &trace->buf[MAX_TRACE_BUF]) {
- currdata->err_type_id = currtrace->type_id;
- currdata->err = -ENOSPC;
- continue;
- }
- currdata->buf_offset = trace->buf_len;
-
- tracesize = currtrace->size;
- if (tracesize > MAX_TRACE_DATA)
- tracesize = MAX_TRACE_DATA;
- ret = bpf_probe_read(buf_offset, tracesize, data_ptr);
- if (ret < 0) {
- currdata->err_type_id = currtrace->type_id;
- currdata->err = ret;
- continue;
- } else {
- currdata->buf_len = tracesize;
- trace->buf_len += tracesize;
- }
- }
-
- /* show accumulated stashed traces (if any) */
- if ((entry && trace->prev_ip && !trace->next_ip) ||
- (!entry && trace->next_ip && !trace->prev_ip))
- output_stashed_traces(ctx, trace, entry);
- else
- output_trace(ctx, trace);
-
- return 0;
-}
-
-SEC("kprobe/foo")
-int kprobe_entry(struct pt_regs *ctx)
-{
- return ksnoop(ctx, true);
-}
-
-SEC("kretprobe/foo")
-int kprobe_return(struct pt_regs *ctx)
-{
- return ksnoop(ctx, false);
-}
-
-char _license[] SEC("license") = "Dual BSD/GPL";
diff --git a/libbpf-tools/ksnoop.c b/libbpf-tools/ksnoop.c
deleted file mode 100644
index a5f59a0f..00000000
--- a/libbpf-tools/ksnoop.c
+++ /dev/null
@@ -1,1013 +0,0 @@
-/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
-/* Copyright (c) 2021, Oracle and/or its affiliates. */
-
-#include <ctype.h>
-#include <errno.h>
-#include <getopt.h>
-#include <signal.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include <bpf/bpf.h>
-#include <bpf/libbpf.h>
-#include <bpf/btf.h>
-
-#include "ksnoop.h"
-#include "ksnoop.skel.h"
-
-#ifndef KSNOOP_VERSION
-#define KSNOOP_VERSION "0.1"
-#endif
-
-static volatile sig_atomic_t exiting = 0;
-
-static struct btf *vmlinux_btf;
-static const char *bin_name;
-static int pages = PAGES_DEFAULT;
-
-enum log_level {
- DEBUG,
- WARN,
- ERROR,
-};
-
-static enum log_level log_level = WARN;
-static bool verbose = false;
-
-static __u32 filter_pid;
-static bool stack_mode;
-
-#define libbpf_errstr(val) strerror(-libbpf_get_error(val))
-
-static void __p(enum log_level level, char *level_str, char *fmt, ...)
-{
- va_list ap;
-
- if (level < log_level)
- return;
- va_start(ap, fmt);
- fprintf(stderr, "%s: ", level_str);
- vfprintf(stderr, fmt, ap);
- fprintf(stderr, "\n");
- va_end(ap);
- fflush(stderr);
-}
-
-#define p_err(fmt, ...) __p(ERROR, "Error", fmt, ##__VA_ARGS__)
-#define p_warn(fmt, ...) __p(WARNING, "Warn", fmt, ##__VA_ARGS__)
-#define p_debug(fmt, ...) __p(DEBUG, "Debug", fmt, ##__VA_ARGS__)
-
-static int do_version(int argc, char **argv)
-{
- printf("%s v%s\n", bin_name, KSNOOP_VERSION);
- return 0;
-}
-
-static int cmd_help(int argc, char **argv)
-{
- fprintf(stderr,
- "Usage: %s [OPTIONS] [COMMAND | help] FUNC\n"
- " COMMAND := { trace | info }\n"
- " FUNC := { name | name(ARG[,ARG]*) }\n"
- " ARG := { arg | arg [PRED] | arg->member [PRED] }\n"
- " PRED := { == | != | > | >= | < | <= value }\n"
- " OPTIONS := { {-d|--debug} | {-v|--verbose} | {-V|--version} |\n"
- " {-p|--pid filter_pid}|\n"
- " {-P|--pages nr_pages} }\n"
- " {-s|--stack}\n",
- bin_name);
- fprintf(stderr,
- "Examples:\n"
- " %s info ip_send_skb\n"
- " %s trace ip_send_skb\n"
- " %s trace \"ip_send_skb(skb, return)\"\n"
- " %s trace \"ip_send_skb(skb->sk, return)\"\n"
- " %s trace \"ip_send_skb(skb->len > 128, skb)\"\n"
- " %s trace -s udp_sendmsg ip_send_skb\n",
- bin_name, bin_name, bin_name, bin_name, bin_name, bin_name);
- return 0;
-}
-
-static void usage(void)
-{
- cmd_help(0, NULL);
- exit(1);
-}
-
-static void type_to_value(struct btf *btf, char *name, __u32 type_id,
- struct value *val)
-{
- const struct btf_type *type;
- __s32 id = type_id;
-
- if (strlen(val->name) == 0) {
- if (name)
- strncpy(val->name, name,
- sizeof(val->name) - 1);
- else
- val->name[0] = '\0';
- }
- do {
- type = btf__type_by_id(btf, id);
-
- switch (BTF_INFO_KIND(type->info)) {
- case BTF_KIND_CONST:
- case BTF_KIND_VOLATILE:
- case BTF_KIND_RESTRICT:
- id = type->type;
- break;
- case BTF_KIND_PTR:
- val->flags |= KSNOOP_F_PTR;
- id = type->type;
- break;
- default:
- val->type_id = id;
- goto done;
- }
- } while (id >= 0);
-
- val->type_id = KSNOOP_ID_UNKNOWN;
- return;
-done:
- val->size = btf__resolve_size(btf, val->type_id);
-}
-
-static int member_to_value(struct btf *btf, const char *name, __u32 type_id,
- struct value *val, int lvl)
-{
- const struct btf_member *member;
- const struct btf_type *type;
- const char *pname;
- __s32 id = type_id;
- int i, nmembers;
- __u8 kind;
-
- /* type_to_value has already stripped qualifiers, so
- * we either have a base type, a struct, union, etc.
- * Only struct/unions have named members so anything
- * else is invalid.
- */
- p_debug("Looking for member '%s' in type id %d", name, type_id);
- type = btf__type_by_id(btf, id);
- pname = btf__str_by_offset(btf, type->name_off);
- if (strlen(pname) == 0)
- pname = "<anon>";
-
- kind = BTF_INFO_KIND(type->info);
- switch (kind) {
- case BTF_KIND_STRUCT:
- case BTF_KIND_UNION:
- nmembers = BTF_INFO_VLEN(type->info);
- p_debug("Checking %d members...", nmembers);
- for (member = (struct btf_member *)(type + 1), i = 0;
- i < nmembers;
- member++, i++) {
- const char *mname;
- __u16 offset;
-
- type = btf__type_by_id(btf, member->type);
- mname = btf__str_by_offset(btf, member->name_off);
- offset = member->offset / 8;
-
- p_debug("Checking member '%s' type %d offset %d",
- mname, member->type, offset);
-
- /* anonymous struct member? */
- kind = BTF_INFO_KIND(type->info);
- if (strlen(mname) == 0 &&
- (kind == BTF_KIND_STRUCT ||
- kind == BTF_KIND_UNION)) {
- p_debug("Checking anon struct/union %d",
- member->type);
- val->offset += offset;
- if (!member_to_value(btf, name, member->type,
- val, lvl + 1))
- return 0;
- val->offset -= offset;
- continue;
- }
-
- if (strcmp(mname, name) == 0) {
- val->offset += offset;
- val->flags |= KSNOOP_F_MEMBER;
- type_to_value(btf, NULL, member->type, val);
- p_debug("Member '%s', offset %d, flags %x size %d",
- mname, val->offset, val->flags,
- val->size);
- return 0;
- }
- }
- if (lvl > 0)
- break;
- p_err("No member '%s' found in %s [%d], offset %d", name, pname,
- id, val->offset);
- break;
- default:
- p_err("'%s' is not a struct/union", pname);
- break;
- }
- return -ENOENT;
-}
-
-static int get_func_btf(struct btf *btf, struct func *func)
-{
- const struct btf_param *param;
- const struct btf_type *type;
- __u8 i;
-
- func->id = btf__find_by_name_kind(btf, func->name, BTF_KIND_FUNC);
- if (func->id <= 0) {
- p_err("Cannot find function '%s' in BTF: %s",
- func->name, strerror(-func->id));
- return -ENOENT;
- }
- type = btf__type_by_id(btf, func->id);
- if (libbpf_get_error(type) ||
- BTF_INFO_KIND(type->info) != BTF_KIND_FUNC) {
- p_err("Error looking up function type via id '%d'", func->id);
- return -EINVAL;
- }
- type = btf__type_by_id(btf, type->type);
- if (libbpf_get_error(type) ||
- BTF_INFO_KIND(type->info) != BTF_KIND_FUNC_PROTO) {
- p_err("Error looking up function proto type via id '%d'",
- func->id);
- return -EINVAL;
- }
- for (param = (struct btf_param *)(type + 1), i = 0;
- i < BTF_INFO_VLEN(type->info) && i < MAX_ARGS;
- param++, i++) {
- type_to_value(btf,
- (char *)btf__str_by_offset(btf, param->name_off),
- param->type, &func->args[i]);
- p_debug("arg #%d: <name '%s', type id '%u'>",
- i + 1, func->args[i].name, func->args[i].type_id);
- }
-
- /* real number of args, even if it is > number we recorded. */
- func->nr_args = BTF_INFO_VLEN(type->info);
-
- type_to_value(btf, KSNOOP_RETURN_NAME, type->type,
- &func->args[KSNOOP_RETURN]);
- p_debug("return value: type id '%u'>",
- func->args[KSNOOP_RETURN].type_id);
- return 0;
-}
-
-static int predicate_to_value(char *predicate, struct value *val)
-{
- char pred[MAX_STR];
- long v;
-
- if (!predicate)
- return 0;
-
- p_debug("checking predicate '%s' for '%s'", predicate, val->name);
-
- if (sscanf(predicate, "%[!=><]%li", pred, &v) != 2) {
- p_err("Invalid specification; expected predicate, not '%s'",
- predicate);
- return -EINVAL;
- }
- if (!(val->flags & KSNOOP_F_PTR) &&
- (val->size == 0 || val->size > sizeof(__u64))) {
- p_err("'%s' (size %d) does not support predicate comparison",
- val->name, val->size);
- return -EINVAL;
- }
- val->predicate_value = (__u64)v;
-
- if (strcmp(pred, "==") == 0) {
- val->flags |= KSNOOP_F_PREDICATE_EQ;
- goto out;
- } else if (strcmp(pred, "!=") == 0) {
- val->flags |= KSNOOP_F_PREDICATE_NOTEQ;
- goto out;
- }
- if (pred[0] == '>')
- val->flags |= KSNOOP_F_PREDICATE_GT;
- else if (pred[0] == '<')
- val->flags |= KSNOOP_F_PREDICATE_LT;
-
- if (strlen(pred) == 1)
- goto out;
-
- if (pred[1] != '=') {
- p_err("Invalid predicate specification '%s'", predicate);
- return -EINVAL;
- }
- val->flags |= KSNOOP_F_PREDICATE_EQ;
-
-out:
- p_debug("predicate '%s', flags 0x%x value %x",
- pred, val->flags, val->predicate_value);
-
- return 0;
-}
-
-static int trace_to_value(struct btf *btf, struct func *func, char *argname,
- char *membername, char *predicate, struct value *val)
-{
- __u8 i;
-
- if (strlen(membername) > 0)
- snprintf(val->name, sizeof(val->name), "%s->%s",
- argname, membername);
- else
- strncpy(val->name, argname, sizeof(val->name));
-
- for (i = 0; i < MAX_TRACES; i++) {
- if (!func->args[i].name)
- continue;
- if (strcmp(argname, func->args[i].name) != 0)
- continue;
- p_debug("setting base arg for val %s to %d", val->name, i);
- val->base_arg = i;
-
- if (strlen(membername) > 0) {
- if (member_to_value(btf, membername,
- func->args[i].type_id, val, 0))
- return -ENOENT;
- } else {
- val->type_id = func->args[i].type_id;
- val->flags |= func->args[i].flags;
- val->size = func->args[i].size;
- }
- return predicate_to_value(predicate, val);
- }
- p_err("Could not find '%s' in arguments/return value for '%s'",
- argname, func->name);
- return -ENOENT;
-}
-
-static struct btf *get_btf(const char *name)
-{
- struct btf *mod_btf;
-
- p_debug("getting BTF for %s",
- name && strlen(name) > 0 ? name : "vmlinux");
-
- if (!vmlinux_btf) {
- vmlinux_btf = libbpf_find_kernel_btf();
- if (libbpf_get_error(vmlinux_btf)) {
- p_err("No BTF, cannot determine type info: %s",
- libbpf_errstr(vmlinux_btf));
- return NULL;
- }
- }
- if (!name || strlen(name) == 0)
- return vmlinux_btf;
-
- mod_btf = btf__load_module_btf(name, vmlinux_btf);
- if (libbpf_get_error(mod_btf)) {
- p_err("No BTF for module '%s': %s",
- name, libbpf_errstr(mod_btf));
- return NULL;
- }
- return mod_btf;
-}
-
-static void copy_without_spaces(char *target, char *src)
-{
- for (; *src != '\0'; src++)
- if (!isspace(*src))
- *(target++) = *src;
- *target = '\0';
-}
-
-static char *type_id_to_str(struct btf *btf, __s32 type_id, char *str)
-{
- const struct btf_type *type;
- const char *name = "";
- char *prefix = "";
- char *suffix = " ";
- char *ptr = "";
-
- str[0] = '\0';
-
- switch (type_id) {
- case 0:
- name = "void";
- break;
- case KSNOOP_ID_UNKNOWN:
- name = "?";
- break;
- default:
- do {
- type = btf__type_by_id(btf, type_id);
-
- if (libbpf_get_error(type)) {
- name = "?";
- break;
- }
- switch (BTF_INFO_KIND(type->info)) {
- case BTF_KIND_CONST:
- case BTF_KIND_VOLATILE:
- case BTF_KIND_RESTRICT:
- type_id = type->type;
- break;
- case BTF_KIND_PTR:
- ptr = "* ";
- type_id = type->type;
- break;
- case BTF_KIND_ARRAY:
- suffix = "[]";
- type_id = type->type;
- break;
- case BTF_KIND_STRUCT:
- prefix = "struct ";
- name = btf__str_by_offset(btf, type->name_off);
- break;
- case BTF_KIND_UNION:
- prefix = "union ";
- name = btf__str_by_offset(btf, type->name_off);
- break;
- case BTF_KIND_ENUM:
- prefix = "enum ";
- name = btf__str_by_offset(btf, type->name_off);
- break;
- case BTF_KIND_TYPEDEF:
- name = btf__str_by_offset(btf, type->name_off);
- break;
- default:
- name = btf__str_by_offset(btf, type->name_off);
- break;
- }
- } while (type_id >= 0 && strlen(name) == 0);
- break;
- }
- snprintf(str, MAX_STR, "%s%s%s%s", prefix, name, suffix, ptr);
-
- return str;
-}
-
-static char *value_to_str(struct btf *btf, struct value *val, char *str)
-{
-
- str = type_id_to_str(btf, val->type_id, str);
- if (val->flags & KSNOOP_F_PTR)
- strncat(str, "*", MAX_STR);
- if (strlen(val->name) > 0 &&
- strcmp(val->name, KSNOOP_RETURN_NAME) != 0)
- strncat(str, val->name, MAX_STR);
-
- return str;
-}
-
-/* based heavily on bpf_object__read_kallsyms_file() in libbpf.c */
-static int get_func_ip_mod(struct func *func)
-{
- char sym_type, sym_name[MAX_STR], mod_info[MAX_STR];
- unsigned long long sym_addr;
- int ret, err = 0;
- FILE *f;
-
- f = fopen("/proc/kallsyms", "r");
- if (!f) {
- err = errno;
- p_err("failed to open /proc/kallsyms: %d", strerror(err));
- return err;
- }
-
- while (true) {
- ret = fscanf(f, "%llx %c %128s%[^\n]\n",
- &sym_addr, &sym_type, sym_name, mod_info);
- if (ret == EOF && feof(f))
- break;
- if (ret < 3) {
- p_err("failed to read kallsyms entry: %d", ret);
- err = -EINVAL;
- goto out;
- }
- if (strcmp(func->name, sym_name) != 0)
- continue;
- func->ip = sym_addr;
- func->mod[0] = '\0';
- /* get module name from [modname] */
- if (ret == 4) {
- if (sscanf(mod_info, "%*[\t ][%[^]]", func->mod) < 1) {
- p_err("failed to read module name");
- err = -EINVAL;
- goto out;
- }
- }
- p_debug("%s = <ip %llx, mod %s>", func->name, func->ip,
- strlen(func->mod) > 0 ? func->mod : "vmlinux");
- break;
- }
-out:
- fclose(f);
- return err;
-}
-
-static void trace_printf(void *ctx, const char *fmt, va_list args)
-{
- vprintf(fmt, args);
-}
-
-#define VALID_NAME "%[A-Za-z0-9\\-_]"
-#define ARGDATA "%[^)]"
-
-static int parse_trace(char *str, struct trace *trace)
-{
- __u8 i, nr_predicates = 0, nr_entry = 0, nr_return = 0;
- char argname[MAX_NAME], membername[MAX_NAME];
- char tracestr[MAX_STR], argdata[MAX_STR];
- struct func *func = &trace->func;
- struct btf_dump_opts opts = { };
- char *arg, *saveptr;
- int ret;
-
- copy_without_spaces(tracestr, str);
-
- p_debug("Parsing trace '%s'", tracestr);
-
- trace->filter_pid = (__u32)filter_pid;
- if (filter_pid)
- p_debug("Using pid %lu as filter", trace->filter_pid);
-
- trace->btf = vmlinux_btf;
-
- ret = sscanf(tracestr, VALID_NAME "(" ARGDATA ")", func->name, argdata);
- if (ret <= 0)
- usage();
- if (ret == 1) {
- if (strlen(tracestr) > strlen(func->name)) {
- p_err("Invalid function specification '%s'", tracestr);
- usage();
- }
- argdata[0] = '\0';
- p_debug("got func '%s'", func->name);
- } else {
- if (strlen(tracestr) >
- strlen(func->name) + strlen(argdata) + 2) {
- p_err("Invalid function specification '%s'", tracestr);
- usage();
- }
- p_debug("got func '%s', args '%s'", func->name, argdata);
- trace->flags |= KSNOOP_F_CUSTOM;
- }
-
- ret = get_func_ip_mod(func);
- if (ret) {
- p_err("could not get address of '%s'", func->name);
- return ret;
- }
- trace->btf = get_btf(func->mod);
- if (libbpf_get_error(trace->btf)) {
- p_err("could not get BTF for '%s': %s",
- strlen(func->mod) ? func->mod : "vmlinux",
- libbpf_errstr(trace->btf));
- return -ENOENT;
- }
- trace->dump = btf_dump__new(trace->btf, NULL, &opts, trace_printf);
- if (libbpf_get_error(trace->dump)) {
- p_err("could not create BTF dump : %n",
- libbpf_errstr(trace->btf));
- return -EINVAL;
- }
-
- ret = get_func_btf(trace->btf, func);
- if (ret) {
- p_debug("unexpected return value '%d' getting function", ret);
- return ret;
- }
-
- for (arg = strtok_r(argdata, ",", &saveptr), i = 0;
- arg;
- arg = strtok_r(NULL, ",", &saveptr), i++) {
- char *predicate = NULL;
-
- ret = sscanf(arg, VALID_NAME "->" VALID_NAME,
- argname, membername);
- if (ret == 2) {
- if (strlen(arg) >
- strlen(argname) + strlen(membername) + 2) {
- predicate = arg + strlen(argname) +
- strlen(membername) + 2;
- }
- p_debug("'%s' dereferences '%s', predicate '%s'",
- argname, membername, predicate);
- } else {
- if (strlen(arg) > strlen(argname))
- predicate = arg + strlen(argname);
- p_debug("'%s' arg, predcate '%s'", argname, predicate);
- membername[0] = '\0';
- }
-
- if (i >= MAX_TRACES) {
- p_err("Too many arguments; up to %d are supported",
- MAX_TRACES);
- return -EINVAL;
- }
- if (trace_to_value(trace->btf, func, argname, membername,
- predicate, &trace->traces[i]))
- return -EINVAL;
-
- if (predicate)
- nr_predicates++;
- if (trace->traces[i].base_arg == KSNOOP_RETURN)
- nr_return++;
- else
- nr_entry++;
- trace->nr_traces++;
- }
-
- if (trace->nr_traces > 0) {
- trace->flags |= KSNOOP_F_CUSTOM;
- p_debug("custom trace with %d args", trace->nr_traces);
-
- /* If we have one or more predicates _and_ references to
- * entry and return values, we need to activate "stash"
- * mode where arg traces are stored on entry and not
- * sent until return to ensure predicates are satisfied.
- */
- if (nr_predicates > 0 && nr_entry > 0 && nr_return > 0) {
- trace->flags |= KSNOOP_F_STASH;
- p_debug("activating stash mode on entry");
- }
- } else {
- p_debug("Standard trace, function with %d arguments",
- func->nr_args);
- /* copy function arg/return value to trace specification. */
- memcpy(trace->traces, func->args, sizeof(trace->traces));
- for (i = 0; i < MAX_TRACES; i++)
- trace->traces[i].base_arg = i;
- trace->nr_traces = MAX_TRACES;
- }
-
- return 0;
-}
-
-static int parse_traces(int argc, char **argv, struct trace **traces)
-{
- __u8 i;
-
- if (argc == 0)
- usage();
-
- if (argc > MAX_FUNC_TRACES) {
- p_err("A maximum of %d traces are supported", MAX_FUNC_TRACES);
- return -EINVAL;
- }
- *traces = calloc(argc, sizeof(struct trace));
- if (!*traces) {
- p_err("Could not allocate %d traces", argc);
- return -ENOMEM;
- }
- for (i = 0; i < argc; i++) {
- if (parse_trace(argv[i], &((*traces)[i])))
- return -EINVAL;
- if (!stack_mode || i == 0)
- continue;
- /* tell stack mode trace which function to expect next */
- (*traces)[i].prev_ip = (*traces)[i-1].func.ip;
- (*traces)[i-1].next_ip = (*traces)[i].func.ip;
- }
- return i;
-}
-
-static int cmd_info(int argc, char **argv)
-{
- struct trace *traces = NULL;
- char str[MAX_STR];
- int nr_traces;
- __u8 i, j;
-
- nr_traces = parse_traces(argc, argv, &traces);
- if (nr_traces < 0)
- return nr_traces;
-
- for (i = 0; i < nr_traces; i++) {
- struct func *func = &traces[i].func;
-
- printf("%s%s(",
- value_to_str(traces[i].btf, &func->args[KSNOOP_RETURN],
- str),
- func->name);
- for (j = 0; j < func->nr_args; j++) {
- if (j > 0)
- printf(", ");
- printf("%s", value_to_str(traces[i].btf, &func->args[j],
- str));
- }
- if (func->nr_args > MAX_ARGS)
- printf(" /* and %d more args that are not traceable */",
- func->nr_args - MAX_ARGS);
- printf(");\n");
- }
- free(traces);
- return 0;
-}
-
-static void trace_handler(void *ctx, int cpu, void *data, __u32 size)
-{
- struct trace *trace = data;
- int i, shown, ret;
-
- p_debug("got trace, size %d", size);
- if (size < (sizeof(*trace) - MAX_TRACE_BUF)) {
- p_err("\t/* trace buffer size '%u' < min %ld */",
- size, sizeof(trace) - MAX_TRACE_BUF);
- return;
- }
- printf("%16lld %4d %8u %s(\n", trace->time, trace->cpu, trace->pid,
- trace->func.name);
-
- for (i = 0, shown = 0; i < trace->nr_traces; i++) {
- DECLARE_LIBBPF_OPTS(btf_dump_type_data_opts, opts);
- bool entry = trace->data_flags & KSNOOP_F_ENTRY;
- struct value *val = &trace->traces[i];
- struct trace_data *data = &trace->trace_data[i];
-
- opts.indent_level = 36;
- opts.indent_str = " ";
-
- /* skip if it's entry data and trace data is for return, or
- * if it's return and trace data is entry; only exception in
- * the latter case is if we stashed data; in such cases we
- * want to see it as it's a mix of entry/return data with
- * predicates.
- */
- if ((entry && !base_arg_is_entry(val->base_arg)) ||
- (!entry && base_arg_is_entry(val->base_arg) &&
- !(trace->flags & KSNOOP_F_STASH)))
- continue;
-
- if (val->type_id == 0)
- continue;
-
- if (shown > 0)
- printf(",\n");
- printf("%34s %s = ", "", val->name);
- if (val->flags & KSNOOP_F_PTR)
- printf("*(0x%llx)", data->raw_value);
- printf("\n");
-
- if (data->err_type_id != 0) {
- char typestr[MAX_STR];
-
- printf("%36s /* Cannot show '%s' as '%s%s'; invalid/userspace ptr? */\n",
- "",
- val->name,
- type_id_to_str(trace->btf,
- val->type_id,
- typestr),
- val->flags & KSNOOP_F_PTR ?
- " *" : "");
- } else {
- ret = btf_dump__dump_type_data
- (trace->dump, val->type_id,
- trace->buf + data->buf_offset,
- data->buf_len, &opts);
- /* truncated? */
- if (ret == -E2BIG)
- printf("%36s... /* %d bytes of %d */", "",
- data->buf_len,
- val->size);
- }
- shown++;
-
- }
- printf("\n%31s);\n\n", "");
- fflush(stdout);
-}
-
-static void lost_handler(void *ctx, int cpu, __u64 cnt)
-{
- p_err("\t/* lost %llu events */", cnt);
-}
-
-static void sig_int(int signo)
-{
- exiting = 1;
-}
-
-static int add_traces(struct bpf_map *func_map, struct trace *traces,
- int nr_traces)
-{
- int i, j, ret, nr_cpus = libbpf_num_possible_cpus();
- struct trace *map_traces;
-
- map_traces = calloc(nr_cpus, sizeof(struct trace));
- if (!map_traces) {
- p_err("Could not allocate memory for %d traces", nr_traces);
- return -ENOMEM;
- }
- for (i = 0; i < nr_traces; i++) {
- for (j = 0; j < nr_cpus; j++)
- memcpy(&map_traces[j], &traces[i],
- sizeof(map_traces[j]));
-
- ret = bpf_map_update_elem(bpf_map__fd(func_map),
- &traces[i].func.ip,
- map_traces,
- BPF_NOEXIST);
- if (ret) {
- p_err("Could not add map entry for '%s': %s",
- traces[i].func.name, strerror(-ret));
- break;
- }
- }
- free(map_traces);
- return ret;
-}
-
-static int attach_traces(struct ksnoop_bpf *skel, struct trace *traces,
- int nr_traces)
-{
- int i, ret;
-
- for (i = 0; i < nr_traces; i++) {
- traces[i].links[0] =
- bpf_program__attach_kprobe(skel->progs.kprobe_entry,
- false,
- traces[i].func.name);
- ret = libbpf_get_error(traces[i].links[0]);
- if (ret) {
- p_err("Could not attach kprobe to '%s': %s",
- traces[i].func.name, strerror(-ret));
- return ret;
- }
- p_debug("Attached kprobe for '%s'", traces[i].func.name);
-
- traces[i].links[1] =
- bpf_program__attach_kprobe(skel->progs.kprobe_return,
- true,
- traces[i].func.name);
- ret = libbpf_get_error(traces[i].links[1]);
- if (ret) {
- p_err("Could not attach kretprobe to '%s': %s",
- traces[i].func.name, strerror(-ret));
- return ret;
- }
- p_debug("Attached kretprobe for '%s'", traces[i].func.name);
- }
- return 0;
-}
-
-static int cmd_trace(int argc, char **argv)
-{
- struct perf_buffer_opts pb_opts = {};
- struct bpf_map *perf_map, *func_map;
- struct perf_buffer *pb = NULL;
- struct ksnoop_bpf *skel;
- int i, nr_traces, ret = -1;
- struct trace *traces = NULL;
-
- nr_traces = parse_traces(argc, argv, &traces);
- if (nr_traces < 0)
- return nr_traces;
-
- skel = ksnoop_bpf__open_and_load();
- if (!skel) {
- p_err("Could not load ksnoop BPF: %s", libbpf_errstr(skel));
- return 1;
- }
-
- perf_map = skel->maps.ksnoop_perf_map;
- if (!perf_map) {
- p_err("Could not find '%s'", "ksnoop_perf_map");
- goto cleanup;
- }
- func_map = bpf_object__find_map_by_name(skel->obj, "ksnoop_func_map");
- if (!func_map) {
- p_err("Could not find '%s'", "ksnoop_func_map");
- goto cleanup;
- }
-
- if (add_traces(func_map, traces, nr_traces)) {
- p_err("Could not add traces to '%s'", "ksnoop_func_map");
- goto cleanup;
- }
-
- if (attach_traces(skel, traces, nr_traces)) {
- p_err("Could not attach %d traces", nr_traces);
- goto cleanup;
- }
-
- pb_opts.sample_cb = trace_handler;
- pb_opts.lost_cb = lost_handler;
- pb = perf_buffer__new(bpf_map__fd(perf_map), pages, &pb_opts);
- if (libbpf_get_error(pb)) {
- p_err("Could not create perf buffer: %s",
- libbpf_errstr(pb));
- goto cleanup;
- }
-
- printf("%16s %4s %8s %s\n", "TIME", "CPU", "PID", "FUNCTION/ARGS");
-
- if (signal(SIGINT, sig_int) == SIG_ERR) {
- fprintf(stderr, "can't set signal handler: %s\n", strerror(errno));
- ret = 1;
- goto cleanup;
- }
-
- while (!exiting) {
- ret = perf_buffer__poll(pb, 1);
- if (ret < 0 && errno != EINTR) {
- fprintf(stderr, "error polling perf buffer: %s\n", strerror(errno));
- goto cleanup;
- }
- /* reset ret to return 0 if exiting */
- ret = 0;
- }
-
-cleanup:
- for (i = 0; i < nr_traces; i++) {
- bpf_link__destroy(traces[i].links[0]);
- bpf_link__destroy(traces[i].links[1]);
- }
- free(traces);
- perf_buffer__free(pb);
- ksnoop_bpf__destroy(skel);
-
- return ret;
-}
-
-struct cmd {
- const char *cmd;
- int (*func)(int argc, char **argv);
-};
-
-struct cmd cmds[] = {
- { "info", cmd_info },
- { "trace", cmd_trace },
- { "help", cmd_help },
- { NULL, NULL }
-};
-
-static int cmd_select(int argc, char **argv)
-{
- int i;
-
- for (i = 0; cmds[i].cmd; i++) {
- if (strncmp(*argv, cmds[i].cmd, strlen(*argv)) == 0)
- return cmds[i].func(argc - 1, argv + 1);
- }
- return cmd_trace(argc, argv);
-}
-
-static int libbpf_print_fn(enum libbpf_print_level level, const char *format, va_list args)
-{
- if (level == LIBBPF_DEBUG && !verbose)
- return 0;
- return vfprintf(stderr, format, args);
-}
-
-int main(int argc, char *argv[])
-{
- static const struct option options[] = {
- { "debug", no_argument, NULL, 'd' },
- { "verbose", no_argument, NULL, 'v' },
- { "help", no_argument, NULL, 'h' },
- { "version", no_argument, NULL, 'V' },
- { "pages", required_argument, NULL, 'P' },
- { "pid", required_argument, NULL, 'p' },
- { 0 }
- };
- int opt;
-
- bin_name = argv[0];
-
- while ((opt = getopt_long(argc, argv, "dvhp:P:sV", options,
- NULL)) >= 0) {
- switch (opt) {
- case 'd':
- verbose = true;
- log_level = DEBUG;
- break;
- case 'v':
- verbose = true;
- log_level = DEBUG;
- break;
- case 'h':
- return cmd_help(argc, argv);
- case 'V':
- return do_version(argc, argv);
- case 'p':
- filter_pid = atoi(optarg);
- break;
- case 'P':
- pages = atoi(optarg);
- break;
- case 's':
- stack_mode = true;
- break;
- default:
- p_err("unrecognized option '%s'", argv[optind - 1]);
- usage();
- }
- }
- if (argc == 1)
- usage();
- argc -= optind;
- argv += optind;
- if (argc < 0)
- usage();
-
- libbpf_set_print(libbpf_print_fn);
-
- return cmd_select(argc, argv);
-}
diff --git a/libbpf-tools/ksnoop.h b/libbpf-tools/ksnoop.h
deleted file mode 100644
index 6b33df4e..00000000
--- a/libbpf-tools/ksnoop.h
+++ /dev/null
@@ -1,123 +0,0 @@
-/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
-/* Copyright (c) 2021, Oracle and/or its affiliates. */
-
-/* maximum number of different functions we can trace at once */
-#define MAX_FUNC_TRACES 64
-
-enum arg {
- KSNOOP_ARG1,
- KSNOOP_ARG2,
- KSNOOP_ARG3,
- KSNOOP_ARG4,
- KSNOOP_ARG5,
- KSNOOP_RETURN
-};
-
-/* we choose "return" as the name for the returned value because as
- * a C keyword it can't clash with a function entry parameter.
- */
-#define KSNOOP_RETURN_NAME "return"
-
-/* if we can't get a type id for a type (such as module-specific type)
- * mark it as KSNOOP_ID_UNKNOWN since BTF lookup in bpf_snprintf_btf()
- * will fail and the data will be simply displayed as a __u64.
- */
-#define KSNOOP_ID_UNKNOWN 0xffffffff
-
-#define MAX_NAME 96
-#define MAX_STR 256
-#define MAX_PATH 512
-#define MAX_VALUES 6
-#define MAX_ARGS (MAX_VALUES - 1)
-#define KSNOOP_F_PTR 0x1 /* value is a pointer */
-#define KSNOOP_F_MEMBER 0x2 /* member reference */
-#define KSNOOP_F_ENTRY 0x4
-#define KSNOOP_F_RETURN 0x8
-#define KSNOOP_F_CUSTOM 0x10 /* custom trace */
-#define KSNOOP_F_STASH 0x20 /* store values on entry,
- * no perf events.
- */
-#define KSNOOP_F_STASHED 0x40 /* values stored on entry */
-
-#define KSNOOP_F_PREDICATE_EQ 0x100
-#define KSNOOP_F_PREDICATE_NOTEQ 0x200
-#define KSNOOP_F_PREDICATE_GT 0x400
-#define KSNOOP_F_PREDICATE_LT 0x800
-
-#define KSNOOP_F_PREDICATE_MASK (KSNOOP_F_PREDICATE_EQ | \
- KSNOOP_F_PREDICATE_NOTEQ | \
- KSNOOP_F_PREDICATE_GT | \
- KSNOOP_F_PREDICATE_LT)
-
-/* for kprobes, entry is function IP + sizeof(kprobe_opcode_t),
- * subtract in BPF prog context to get fn address.
- */
-#ifdef __TARGET_ARCH_x86
-#define KSNOOP_IP_FIX(ip) (ip - sizeof(kprobe_opcode_t))
-#else
-#define KSNOOP_IP_FIX(ip) ip
-#endif
-
-struct value {
- char name[MAX_STR];
- enum arg base_arg;
- __u32 offset;
- __u32 size;
- __u64 type_id;
- __u64 flags;
- __u64 predicate_value;
-};
-
-struct func {
- char name[MAX_NAME];
- char mod[MAX_NAME];
- __s32 id;
- __u8 nr_args;
- __u64 ip;
- struct value args[MAX_VALUES];
-};
-
-#define MAX_TRACES MAX_VALUES
-
-#define MAX_TRACE_DATA 2048
-
-struct trace_data {
- __u64 raw_value;
- __u32 err_type_id; /* type id we can't dereference */
- int err;
- __u32 buf_offset;
- __u16 buf_len;
-};
-
-#define MAX_TRACE_BUF (MAX_TRACES * MAX_TRACE_DATA)
-
-struct trace {
- /* initial values are readonly in tracing context */
- struct btf *btf;
- struct btf_dump *dump;
- struct func func;
- __u8 nr_traces;
- __u32 filter_pid;
- __u64 prev_ip; /* these are used in stack-mode tracing */
- __u64 next_ip;
- struct value traces[MAX_TRACES];
- __u64 flags;
- /* values below this point are set or modified in tracing context */
- __u64 task;
- __u32 pid;
- __u32 cpu;
- __u64 time;
- __u64 data_flags;
- struct trace_data trace_data[MAX_TRACES];
- __u16 buf_len;
- char buf[MAX_TRACE_BUF];
- char buf_end[0];
- struct bpf_link *links[2];
-};
-
-#define PAGES_DEFAULT 16
-
-static inline int base_arg_is_entry(enum arg base_arg)
-{
- return base_arg != KSNOOP_RETURN;
-}
diff --git a/man/man8/ksnoop.8 b/man/man8/ksnoop.8
deleted file mode 100644
index 8733cb73..00000000
--- a/man/man8/ksnoop.8
+++ /dev/null
@@ -1,298 +0,0 @@
-.\" Man page generated from reStructuredText.
-.
-.TH KSNOOP 8 "" "" ""
-.SH NAME
-KSNOOP \- tool for tracing kernel function entry/return showing arguments/return values
-.
-.nr rst2man-indent-level 0
-.
-.de1 rstReportMargin
-\\$1 \\n[an-margin]
-level \\n[rst2man-indent-level]
-level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
--
-\\n[rst2man-indent0]
-\\n[rst2man-indent1]
-\\n[rst2man-indent2]
-..
-.de1 INDENT
-.\" .rstReportMargin pre:
-. RS \\$1
-. nr rst2man-indent\\n[rst2man-indent-level] \\n[an-margin]
-. nr rst2man-indent-level +1
-.\" .rstReportMargin post:
-..
-.de UNINDENT
-. RE
-.\" indent \\n[an-margin]
-.\" old: \\n[rst2man-indent\\n[rst2man-indent-level]]
-.nr rst2man-indent-level -1
-.\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
-.in \\n[rst2man-indent\\n[rst2man-indent-level]]u
-..
-.SH SYNOPSIS
-.INDENT 0.0
-.INDENT 3.5
-\fBksnoop\fP [\fIOPTIONS\fP] { \fICOMMAND\fP \fIFUNC\fP | \fBhelp\fP }
-.sp
-\fIOPTIONS\fP := { { \fB\-V\fP | \fB\-\-version\fP } | { \fB\-h\fP | \fB\-\-help\fP }
-| { [\fB\-P\fP | \fB\-\-pages\fP] nr_pages} | { [\fB\-p\fP | \fB\-\-pid\fP] pid} |
-[{ \fB\-s\fP | \fB\-\-stack\fP }] | [{ \fB\-d\fP | \fB\-\-debug\fP }] }
-.sp
-\fICOMMAND\fP := { \fBtrace\fP | \fBinfo\fP }
-.sp
-\fIFUNC\fP := { \fBname\fP | \fBname\fP(\fBarg\fP[,**arg]) }
-.UNINDENT
-.UNINDENT
-.SH DESCRIPTION
-.INDENT 0.0
-.INDENT 3.5
-\fIksnoop\fP allows for inspection of arguments and return values
-associated with function entry/return.
-.INDENT 0.0
-.TP
-.B \fBksnoop info\fP \fIFUNC\fP
-Show function description, arguments and return value types.
-.TP
-.B \fBksnoop trace\fP \fIFUNC\fP [\fIFUNC\fP]
-Trace function entry and return, showing arguments and
-return values. A function name can simply be specified,
-or a function name along with named arguments, return values.
-\fBreturn\fP is used to specify the return value.
-.UNINDENT
-.sp
-\fIksnoop\fP requires the kernel to provide BTF for itself, and if
-tracing of module data is required, module BTF must be present also.
-Check /sys/kernel/btf to see if BTF is present.
-.sp
-\fBksnoop\fP requires \fICAP_BPF\fP and \fICAP_TRACING\fP capabilities.
-.UNINDENT
-.UNINDENT
-.SH OPTIONS
-.INDENT 0.0
-.INDENT 3.5
-.INDENT 0.0
-.TP
-.B \-h\fP,\fB \-\-help
-Show help information
-.TP
-.B \-V\fP,\fB \-\-version
-Show version.
-.TP
-.B \-d\fP,\fB \-\-debug
-Show debug output.
-.TP
-.B \-p\fP,\fB \-\-pid
-Filter events by pid.
-.TP
-.B \-P\fP,\fB \-\-pages
-Specify number of pages used per\-CPU for perf event
-collection. Default is 8.
-.TP
-.B \-s\fP,\fB \-\-stack
-Specified set of functions are traced if and only
-if they are encountered in the order specified.
-.UNINDENT
-.UNINDENT
-.UNINDENT
-.SH EXAMPLES
-.sp
-\fB# ksnoop info ip_send_skb\fP
-.INDENT 0.0
-.INDENT 3.5
-.sp
-.nf
-.ft C
-int ip_send_skb(struct net * net, struct sk_buff * skb);
-.ft P
-.fi
-.UNINDENT
-.UNINDENT
-.sp
-Show function description.
-.sp
-\fB# ksnoop trace ip_send_skb\fP
-.INDENT 0.0
-.INDENT 3.5
-.sp
-.nf
-.ft C
- TIME CPU PID FUNCTION/ARGS
-78101668506811 1 2813 ip_send_skb(
- net = *(0xffffffffb5959840)
- (struct net){
- .passive = (refcount_t){
- .refs = (atomic_t){
- .counter = (int)0x2,
- },
- },
- .dev_base_seq = (unsigned int)0x18,
- .ifindex = (int)0xf,
- .list = (struct list_head){
- .next = (struct list_head *)0xffff9895440dc120,
- .prev = (struct list_head *)0xffffffffb595a8d0,
- },
- ...
-
-79561322965250 1 2813 ip_send_skb(
- return =
- (int)0x0
- );
-.ft P
-.fi
-.UNINDENT
-.UNINDENT
-.sp
-Show entry/return for ip_send_skb() with arguments, return values.
-.sp
-\fB# ksnoop trace "ip_send_skb(skb)"\fP
-.INDENT 0.0
-.INDENT 3.5
-.sp
-.nf
-.ft C
- TIME CPU PID FUNCTION/ARGS
-78142420834537 1 2813 ip_send_skb(
- skb = *(0xffff989750797c00)
- (struct sk_buff){
- (union){
- .sk = (struct sock *)0xffff98966ce19200,
- .ip_defrag_offset = (int)0x6ce19200,
- },
- (union){
- (struct){
- ._skb_refdst = (long unsigned int)0xffff98981dde2d80,
- .destructor = (void (*)(struct sk_buff *))0xffffffffb3e1beb0,
- },
- ...
-.ft P
-.fi
-.UNINDENT
-.UNINDENT
-.sp
-Show entry argument \fBskb\fP\&.
-.sp
-\fB# ksnoop trace "ip_send_skb(return)"\fP
-.INDENT 0.0
-.INDENT 3.5
-.sp
-.nf
-.ft C
- TIME CPU PID FUNCTION/ARGS
-78178228354796 1 2813 ip_send_skb(
- return =
- (int)0x0
- );
-.ft P
-.fi
-.UNINDENT
-.UNINDENT
-.sp
-Show return value from ip_send_skb().
-.sp
-\fB# ksnoop trace "ip_send_skb(skb\->sk)"\fP
-.INDENT 0.0
-.INDENT 3.5
-.sp
-.nf
-.ft C
- TIME CPU PID FUNCTION/ARGS
-78207649138829 2 2813 ip_send_skb(
- skb\->sk = *(0xffff98966ce19200)
- (struct sock){
- .__sk_common = (struct sock_common){
- (union){
- .skc_addrpair = (__addrpair)0x1701a8c017d38f8d,
- (struct){
- .skc_daddr = (__be32)0x17d38f8d,
- .skc_rcv_saddr = (__be32)0x1701a8c0,
- },
- },
- ...
-.ft P
-.fi
-.UNINDENT
-.UNINDENT
-.sp
-Trace member information associated with argument. Only one level of
-membership is supported.
-.sp
-\fB# ksnoop \-p 2813 "ip_rcv(dev)"\fP
-.INDENT 0.0
-.INDENT 3.5
-.sp
-.nf
-.ft C
- TIME CPU PID FUNCTION/ARGS
-78254803164920 1 2813 ip_rcv(
- dev = *(0xffff9895414cb000)
- (struct net_device){
- .name = (char[16])[
- \(aql\(aq,
- \(aqo\(aq,
- ],
- .name_node = (struct netdev_name_node *)0xffff989541515ec0,
- .state = (long unsigned int)0x3,
- ...
-.ft P
-.fi
-.UNINDENT
-.UNINDENT
-.sp
-Trace \fBdev\fP argument of \fBip_rcv()\fP\&. Specify process id 2813 for events
-for that process only.
-.sp
-\fB# ksnoop \-s tcp_sendmsg __tcp_transmit_skb ip_output\fP
-.INDENT 0.0
-.INDENT 3.5
-.sp
-.nf
-.ft C
- TIME CPU PID FUNCTION/ARGS
-71827770952903 1 4777 __tcp_transmit_skb(
- sk = *(0xffff9852460a2300)
- (struct sock){
- .__sk_common = (struct sock_common){
- (union){
- .skc_addrpair = (__addrpair)0x61b2af0a35cbfe0a,
-.ft P
-.fi
-.UNINDENT
-.UNINDENT
-.sp
-Trace entry/return of tcp_sendmsg, __tcp_transmit_skb and ip_output when
-tcp_sendmsg leads to a call to __tcp_transmit_skb and that in turn
-leads to a call to ip_output; i.e. with a call graph matching the order
-specified. The order does not have to be direct calls, i.e. function A
-can call another function that calls function B.
-.sp
-\fB# ksnoop "ip_send_skb(skb\->len > 100, skb)"\fP
-.INDENT 0.0
-.INDENT 3.5
-.sp
-.nf
-.ft C
- TIME CPU PID FUNCTION/ARGS
-39267395709745 1 2955 ip_send_skb(
- skb\->len =
- (unsigned int)0x89,
- skb = *(0xffff89c8be81e500)
- (struct sk_buff){
- (union){
- .sk = (struct sock *)0xffff89c6c59e5580,
- .ip_defrag_offset = (int)0xc59e5580,
- },
-.ft P
-.fi
-.UNINDENT
-.UNINDENT
-.sp
-Trace ip_send_skb() skbs which have len > 100.
-.SH SEE ALSO
-.INDENT 0.0
-.INDENT 3.5
-\fBbpf\fP(2),
-.UNINDENT
-.UNINDENT
-.\" Generated by docutils manpage writer.
-.
--
2.35.1
Reference in New Issue Copy Permalink