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Diffstat (limited to 'tools/bpf/bpftool/feature.c')
-rw-r--r--tools/bpf/bpftool/feature.c120
1 files changed, 67 insertions, 53 deletions
diff --git a/tools/bpf/bpftool/feature.c b/tools/bpf/bpftool/feature.c
index f54347f55ee0..1b73e63274b5 100644
--- a/tools/bpf/bpftool/feature.c
+++ b/tools/bpf/bpftool/feature.c
@@ -80,13 +80,12 @@ print_bool_feature(const char *feat_name, const char *plain_name,
printf("%s is %savailable\n", plain_name, res ? "" : "NOT ");
}
-static void print_kernel_option(const char *name, const char *value)
+static void print_kernel_option(const char *name, const char *value,
+ const char *define_prefix)
{
char *endptr;
int res;
- /* No support for C-style ouptut */
-
if (json_output) {
if (!value) {
jsonw_null_field(json_wtr, name);
@@ -98,6 +97,12 @@ static void print_kernel_option(const char *name, const char *value)
jsonw_int_field(json_wtr, name, res);
else
jsonw_string_field(json_wtr, name, value);
+ } else if (define_prefix) {
+ if (value)
+ printf("#define %s%s %s\n", define_prefix,
+ name, value);
+ else
+ printf("/* %s%s is not set */\n", define_prefix, name);
} else {
if (value)
printf("%s is set to %s\n", name, value);
@@ -315,77 +320,84 @@ static bool read_next_kernel_config_option(gzFile file, char *buf, size_t n,
return false;
}
-static void probe_kernel_image_config(void)
+static void probe_kernel_image_config(const char *define_prefix)
{
- static const char * const options[] = {
+ static const struct {
+ const char * const name;
+ bool macro_dump;
+ } options[] = {
/* Enable BPF */
- "CONFIG_BPF",
+ { "CONFIG_BPF", },
/* Enable bpf() syscall */
- "CONFIG_BPF_SYSCALL",
+ { "CONFIG_BPF_SYSCALL", },
/* Does selected architecture support eBPF JIT compiler */
- "CONFIG_HAVE_EBPF_JIT",
+ { "CONFIG_HAVE_EBPF_JIT", },
/* Compile eBPF JIT compiler */
- "CONFIG_BPF_JIT",
+ { "CONFIG_BPF_JIT", },
/* Avoid compiling eBPF interpreter (use JIT only) */
- "CONFIG_BPF_JIT_ALWAYS_ON",
+ { "CONFIG_BPF_JIT_ALWAYS_ON", },
/* cgroups */
- "CONFIG_CGROUPS",
+ { "CONFIG_CGROUPS", },
/* BPF programs attached to cgroups */
- "CONFIG_CGROUP_BPF",
+ { "CONFIG_CGROUP_BPF", },
/* bpf_get_cgroup_classid() helper */
- "CONFIG_CGROUP_NET_CLASSID",
+ { "CONFIG_CGROUP_NET_CLASSID", },
/* bpf_skb_{,ancestor_}cgroup_id() helpers */
- "CONFIG_SOCK_CGROUP_DATA",
+ { "CONFIG_SOCK_CGROUP_DATA", },
/* Tracing: attach BPF to kprobes, tracepoints, etc. */
- "CONFIG_BPF_EVENTS",
+ { "CONFIG_BPF_EVENTS", },
/* Kprobes */
- "CONFIG_KPROBE_EVENTS",
+ { "CONFIG_KPROBE_EVENTS", },
/* Uprobes */
- "CONFIG_UPROBE_EVENTS",
+ { "CONFIG_UPROBE_EVENTS", },
/* Tracepoints */
- "CONFIG_TRACING",
+ { "CONFIG_TRACING", },
/* Syscall tracepoints */
- "CONFIG_FTRACE_SYSCALLS",
+ { "CONFIG_FTRACE_SYSCALLS", },
/* bpf_override_return() helper support for selected arch */
- "CONFIG_FUNCTION_ERROR_INJECTION",
+ { "CONFIG_FUNCTION_ERROR_INJECTION", },
/* bpf_override_return() helper */
- "CONFIG_BPF_KPROBE_OVERRIDE",
+ { "CONFIG_BPF_KPROBE_OVERRIDE", },
/* Network */
- "CONFIG_NET",
+ { "CONFIG_NET", },
/* AF_XDP sockets */
- "CONFIG_XDP_SOCKETS",
+ { "CONFIG_XDP_SOCKETS", },
/* BPF_PROG_TYPE_LWT_* and related helpers */
- "CONFIG_LWTUNNEL_BPF",
+ { "CONFIG_LWTUNNEL_BPF", },
/* BPF_PROG_TYPE_SCHED_ACT, TC (traffic control) actions */
- "CONFIG_NET_ACT_BPF",
+ { "CONFIG_NET_ACT_BPF", },
/* BPF_PROG_TYPE_SCHED_CLS, TC filters */
- "CONFIG_NET_CLS_BPF",
+ { "CONFIG_NET_CLS_BPF", },
/* TC clsact qdisc */
- "CONFIG_NET_CLS_ACT",
+ { "CONFIG_NET_CLS_ACT", },
/* Ingress filtering with TC */
- "CONFIG_NET_SCH_INGRESS",
+ { "CONFIG_NET_SCH_INGRESS", },
/* bpf_skb_get_xfrm_state() helper */
- "CONFIG_XFRM",
+ { "CONFIG_XFRM", },
/* bpf_get_route_realm() helper */
- "CONFIG_IP_ROUTE_CLASSID",
+ { "CONFIG_IP_ROUTE_CLASSID", },
/* BPF_PROG_TYPE_LWT_SEG6_LOCAL and related helpers */
- "CONFIG_IPV6_SEG6_BPF",
+ { "CONFIG_IPV6_SEG6_BPF", },
/* BPF_PROG_TYPE_LIRC_MODE2 and related helpers */
- "CONFIG_BPF_LIRC_MODE2",
+ { "CONFIG_BPF_LIRC_MODE2", },
/* BPF stream parser and BPF socket maps */
- "CONFIG_BPF_STREAM_PARSER",
+ { "CONFIG_BPF_STREAM_PARSER", },
/* xt_bpf module for passing BPF programs to netfilter */
- "CONFIG_NETFILTER_XT_MATCH_BPF",
+ { "CONFIG_NETFILTER_XT_MATCH_BPF", },
/* bpfilter back-end for iptables */
- "CONFIG_BPFILTER",
+ { "CONFIG_BPFILTER", },
/* bpftilter module with "user mode helper" */
- "CONFIG_BPFILTER_UMH",
+ { "CONFIG_BPFILTER_UMH", },
/* test_bpf module for BPF tests */
- "CONFIG_TEST_BPF",
+ { "CONFIG_TEST_BPF", },
+
+ /* Misc configs useful in BPF C programs */
+ /* jiffies <-> sec conversion for bpf_jiffies64() helper */
+ { "CONFIG_HZ", true, }
};
char *values[ARRAY_SIZE(options)] = { };
struct utsname utsn;
@@ -427,7 +439,8 @@ static void probe_kernel_image_config(void)
while (read_next_kernel_config_option(file, buf, sizeof(buf), &value)) {
for (i = 0; i < ARRAY_SIZE(options); i++) {
- if (values[i] || strcmp(buf, options[i]))
+ if ((define_prefix && !options[i].macro_dump) ||
+ values[i] || strcmp(buf, options[i].name))
continue;
values[i] = strdup(value);
@@ -439,7 +452,9 @@ end_parse:
gzclose(file);
for (i = 0; i < ARRAY_SIZE(options); i++) {
- print_kernel_option(options[i], values[i]);
+ if (define_prefix && !options[i].macro_dump)
+ continue;
+ print_kernel_option(options[i].name, values[i], define_prefix);
free(values[i]);
}
}
@@ -632,23 +647,22 @@ section_system_config(enum probe_component target, const char *define_prefix)
switch (target) {
case COMPONENT_KERNEL:
case COMPONENT_UNSPEC:
- if (define_prefix)
- break;
-
print_start_section("system_config",
"Scanning system configuration...",
- NULL, /* define_comment never used here */
- NULL); /* define_prefix always NULL here */
- if (check_procfs()) {
- probe_unprivileged_disabled();
- probe_jit_enable();
- probe_jit_harden();
- probe_jit_kallsyms();
- probe_jit_limit();
- } else {
- p_info("/* procfs not mounted, skipping related probes */");
+ "/*** Misc kernel config items ***/",
+ define_prefix);
+ if (!define_prefix) {
+ if (check_procfs()) {
+ probe_unprivileged_disabled();
+ probe_jit_enable();
+ probe_jit_harden();
+ probe_jit_kallsyms();
+ probe_jit_limit();
+ } else {
+ p_info("/* procfs not mounted, skipping related probes */");
+ }
}
- probe_kernel_image_config();
+ probe_kernel_image_config(define_prefix);
print_end_section();
break;
default:
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.