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/*
Copyright (C) 2022 The Falco Authors.
This file is dual licensed under either the MIT or GPL 2. See MIT.txt
or GPL2.txt for full copies of the license.
*/
#include "quirks.h"
#include <generated/utsrelease.h>
#include <uapi/linux/bpf.h>
#include <linux/sched.h>
#include "../driver_config.h"
#include "../ppm_events_public.h"
#include "bpf_helpers.h"
#include "types.h"
#include "maps.h"
#include "plumbing_helpers.h"
#include "ring_helpers.h"
#include "filler_helpers.h"
#include "fillers.h"
#include "builtins.h"
#ifdef BPF_SUPPORTS_RAW_TRACEPOINTS
#define BPF_PROBE(prefix, event, type) \
__bpf_section(TP_NAME #event) \
int bpf_##event(struct type *ctx)
#else
#define BPF_PROBE(prefix, event, type) \
__bpf_section(TP_NAME prefix #event) \
int bpf_##event(struct type *ctx)
#endif
BPF_PROBE("raw_syscalls/", sys_enter, sys_enter_args)
{
const struct syscall_evt_pair *sc_evt;
struct scap_bpf_settings *settings;
enum ppm_event_type evt_type;
int drop_flags;
long id;
if (bpf_in_ia32_syscall())
return 0;
id = bpf_syscall_get_nr(ctx);
if (id < 0 || id >= SYSCALL_TABLE_SIZE)
return 0;
settings = get_bpf_settings();
if (!settings)
return 0;
if (!settings->capture_enabled)
return 0;
sc_evt = get_syscall_info(id);
if (!sc_evt)
return 0;
if (sc_evt->flags & UF_UNINTERESTING)
return 0;
if (sc_evt->flags & UF_USED) {
evt_type = sc_evt->enter_event_type;
drop_flags = sc_evt->flags;
} else {
evt_type = PPME_GENERIC_E;
drop_flags = UF_ALWAYS_DROP;
}
#ifdef BPF_SUPPORTS_RAW_TRACEPOINTS
call_filler(ctx, ctx, evt_type, settings, drop_flags);
#else
/* Duplicated here to avoid verifier madness */
struct sys_enter_args stack_ctx;
memcpy(stack_ctx.args, ctx->args, sizeof(ctx->args));
if (stash_args(stack_ctx.args))
return 0;
call_filler(ctx, &stack_ctx, evt_type, settings, drop_flags);
#endif
return 0;
}
BPF_PROBE("raw_syscalls/", sys_exit, sys_exit_args)
{
const struct syscall_evt_pair *sc_evt;
struct scap_bpf_settings *settings;
enum ppm_event_type evt_type;
int drop_flags;
long id;
if (bpf_in_ia32_syscall())
return 0;
id = bpf_syscall_get_nr(ctx);
if (id < 0 || id >= SYSCALL_TABLE_SIZE)
return 0;
settings = get_bpf_settings();
if (!settings)
return 0;
if (!settings->capture_enabled)
return 0;
sc_evt = get_syscall_info(id);
if (!sc_evt)
return 0;
if (sc_evt->flags & UF_UNINTERESTING)
return 0;
if (sc_evt->flags & UF_USED) {
evt_type = sc_evt->exit_event_type;
drop_flags = sc_evt->flags;
} else {
evt_type = PPME_GENERIC_X;
drop_flags = UF_ALWAYS_DROP;
}
call_filler(ctx, ctx, evt_type, settings, drop_flags);
return 0;
}
BPF_PROBE("sched/", sched_process_exit, sched_process_exit_args)
{
struct scap_bpf_settings *settings;
enum ppm_event_type evt_type;
struct task_struct *task;
unsigned int flags;
task = (struct task_struct *)bpf_get_current_task();
flags = _READ(task->flags);
if (flags & PF_KTHREAD)
return 0;
settings = get_bpf_settings();
if (!settings)
return 0;
if (!settings->capture_enabled)
return 0;
evt_type = PPME_PROCEXIT_1_E;
call_filler(ctx, ctx, evt_type, settings, UF_NEVER_DROP);
return 0;
}
BPF_PROBE("sched/", sched_switch, sched_switch_args)
{
struct scap_bpf_settings *settings;
enum ppm_event_type evt_type;
settings = get_bpf_settings();
if (!settings)
return 0;
if (!settings->capture_enabled)
return 0;
evt_type = PPME_SCHEDSWITCH_6_E;
call_filler(ctx, ctx, evt_type, settings, 0);
return 0;
}
static __always_inline int bpf_page_fault(struct page_fault_args *ctx)
{
struct scap_bpf_settings *settings;
enum ppm_event_type evt_type;
settings = get_bpf_settings();
if (!settings)
return 0;
if (!settings->page_faults)
return 0;
if (!settings->capture_enabled)
return 0;
evt_type = PPME_PAGE_FAULT_E;
call_filler(ctx, ctx, evt_type, settings, UF_ALWAYS_DROP);
return 0;
}
BPF_PROBE("exceptions/", page_fault_user, page_fault_args)
{
return bpf_page_fault(ctx);
}
BPF_PROBE("exceptions/", page_fault_kernel, page_fault_args)
{
return bpf_page_fault(ctx);
}
BPF_PROBE("signal/", signal_deliver, signal_deliver_args)
{
struct scap_bpf_settings *settings;
enum ppm_event_type evt_type;
settings = get_bpf_settings();
if (!settings)
return 0;
if (!settings->capture_enabled)
return 0;
evt_type = PPME_SIGNALDELIVER_E;
call_filler(ctx, ctx, evt_type, settings, UF_ALWAYS_DROP);
return 0;
}
#ifndef BPF_SUPPORTS_RAW_TRACEPOINTS
__bpf_section(TP_NAME "sched/sched_process_fork")
int bpf_sched_process_fork(struct sched_process_fork_args *ctx)
{
struct scap_bpf_settings *settings;
enum ppm_event_type evt_type;
struct sys_stash_args args;
unsigned long *argsp;
settings = get_bpf_settings();
if (!settings)
return 0;
if (!settings->capture_enabled)
return 0;
argsp = __unstash_args(ctx->parent_pid);
if (!argsp)
return 0;
memcpy(&args, argsp, sizeof(args));
__stash_args(ctx->child_pid, args.args);
return 0;
}
#endif
char kernel_ver[] __bpf_section("kernel_version") = UTS_RELEASE;
char __license[] __bpf_section("license") = "GPL";
char probe_ver[] __bpf_section("probe_version") = DRIVER_VERSION;
char probe_commit[] __bpf_section("build_commit") = DRIVER_COMMIT;
uint64_t probe_api_ver __bpf_section("api_version") = PPM_API_CURRENT_VERSION;
uint64_t probe_schema_ver __bpf_section("schema_version") = PPM_SCHEMA_CURRENT_VERSION;
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