[linux-block.git] / tools / lib / bpf / libbpf_probes.c

// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
/* Copyright (c) 2019 Netronome Systems, Inc. */

#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <net/if.h>
#include <sys/utsname.h>

#include <linux/btf.h>
#include <linux/filter.h>
#include <linux/kernel.h>

#include "bpf.h"
#include "libbpf.h"
#include "libbpf_internal.h"

/* make sure libbpf doesn't use kernel-only integer typedefs */
#pragma GCC poison u8 u16 u32 u64 s8 s16 s32 s64

static bool grep(const char *buffer, const char *pattern)
{
	return !!strstr(buffer, pattern);
}

static int get_vendor_id(int ifindex)
{
	char ifname[IF_NAMESIZE], path[64], buf[8];
	ssize_t len;
	int fd;

	if (!if_indextoname(ifindex, ifname))
		return -1;

	snprintf(path, sizeof(path), "/sys/class/net/%s/device/vendor", ifname);

	fd = open(path, O_RDONLY);
	if (fd < 0)
		return -1;

	len = read(fd, buf, sizeof(buf));
	close(fd);
	if (len < 0)
		return -1;
	if (len >= (ssize_t)sizeof(buf))
		return -1;
	buf[len] = '\0';

	return strtol(buf, NULL, 0);
}

static int get_kernel_version(void)
{
	int version, subversion, patchlevel;
	struct utsname utsn;

	/* Return 0 on failure, and attempt to probe with empty kversion */
	if (uname(&utsn))
		return 0;

	if (sscanf(utsn.release, "%d.%d.%d",
		   &version, &subversion, &patchlevel) != 3)
		return 0;

	return (version << 16) + (subversion << 8) + patchlevel;
}

static void
probe_load(enum bpf_prog_type prog_type, const struct bpf_insn *insns,
	   size_t insns_cnt, char *buf, size_t buf_len, __u32 ifindex)
{
	struct bpf_load_program_attr xattr = {};
	int fd;

	switch (prog_type) {
	case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
		xattr.expected_attach_type = BPF_CGROUP_INET4_CONNECT;
		break;
	case BPF_PROG_TYPE_KPROBE:
		xattr.kern_version = get_kernel_version();
		break;
	case BPF_PROG_TYPE_UNSPEC:
	case BPF_PROG_TYPE_SOCKET_FILTER:
	case BPF_PROG_TYPE_SCHED_CLS:
	case BPF_PROG_TYPE_SCHED_ACT:
	case BPF_PROG_TYPE_TRACEPOINT:
	case BPF_PROG_TYPE_XDP:
	case BPF_PROG_TYPE_PERF_EVENT:
	case BPF_PROG_TYPE_CGROUP_SKB:
	case BPF_PROG_TYPE_CGROUP_SOCK:
	case BPF_PROG_TYPE_LWT_IN:
	case BPF_PROG_TYPE_LWT_OUT:
	case BPF_PROG_TYPE_LWT_XMIT:
	case BPF_PROG_TYPE_SOCK_OPS:
	case BPF_PROG_TYPE_SK_SKB:
	case BPF_PROG_TYPE_CGROUP_DEVICE:
	case BPF_PROG_TYPE_SK_MSG:
	case BPF_PROG_TYPE_RAW_TRACEPOINT:
	case BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE:
	case BPF_PROG_TYPE_LWT_SEG6LOCAL:
	case BPF_PROG_TYPE_LIRC_MODE2:
	case BPF_PROG_TYPE_SK_REUSEPORT:
	case BPF_PROG_TYPE_FLOW_DISSECTOR:
	case BPF_PROG_TYPE_CGROUP_SYSCTL:
	case BPF_PROG_TYPE_CGROUP_SOCKOPT:
	case BPF_PROG_TYPE_TRACING:
	case BPF_PROG_TYPE_STRUCT_OPS:
	case BPF_PROG_TYPE_EXT:
	case BPF_PROG_TYPE_LSM:
	default:
		break;
	}

	xattr.prog_type = prog_type;
	xattr.insns = insns;
	xattr.insns_cnt = insns_cnt;
	xattr.license = "GPL";
	xattr.prog_ifindex = ifindex;

	fd = bpf_load_program_xattr(&xattr, buf, buf_len);
	if (fd >= 0)
		close(fd);
}

bool bpf_probe_prog_type(enum bpf_prog_type prog_type, __u32 ifindex)
{
	struct bpf_insn insns[2] = {
		BPF_MOV64_IMM(BPF_REG_0, 0),
		BPF_EXIT_INSN()
	};

	if (ifindex && prog_type == BPF_PROG_TYPE_SCHED_CLS)
		/* nfp returns -EINVAL on exit(0) with TC offload */
		insns[0].imm = 2;

	errno = 0;
	probe_load(prog_type, insns, ARRAY_SIZE(insns), NULL, 0, ifindex);

	return errno != EINVAL && errno != EOPNOTSUPP;
}

int libbpf__load_raw_btf(const char *raw_types, size_t types_len,
			 const char *str_sec, size_t str_len)
{
	struct btf_header hdr = {
		.magic = BTF_MAGIC,
		.version = BTF_VERSION,
		.hdr_len = sizeof(struct btf_header),
		.type_len = types_len,
		.str_off = types_len,
		.str_len = str_len,
	};
	int btf_fd, btf_len;
	__u8 *raw_btf;

	btf_len = hdr.hdr_len + hdr.type_len + hdr.str_len;
	raw_btf = malloc(btf_len);
	if (!raw_btf)
		return -ENOMEM;

	memcpy(raw_btf, &hdr, sizeof(hdr));
	memcpy(raw_btf + hdr.hdr_len, raw_types, hdr.type_len);
	memcpy(raw_btf + hdr.hdr_len + hdr.type_len, str_sec, hdr.str_len);

	btf_fd = bpf_load_btf(raw_btf, btf_len, NULL, 0, false);

	free(raw_btf);
	return btf_fd;
}

static int load_sk_storage_btf(void)
{
	const char strs[] = "\0bpf_spin_lock\0val\0cnt\0l";
	/* struct bpf_spin_lock {
	 *   int val;
	 * };
	 * struct val {
	 *   int cnt;
	 *   struct bpf_spin_lock l;
	 * };
	 */
	__u32 types[] = {
		/* int */
		BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4),  /* [1] */
		/* struct bpf_spin_lock */                      /* [2] */
		BTF_TYPE_ENC(1, BTF_INFO_ENC(BTF_KIND_STRUCT, 0, 1), 4),
		BTF_MEMBER_ENC(15, 1, 0), /* int val; */
		/* struct val */                                /* [3] */
		BTF_TYPE_ENC(15, BTF_INFO_ENC(BTF_KIND_STRUCT, 0, 2), 8),
		BTF_MEMBER_ENC(19, 1, 0), /* int cnt; */
		BTF_MEMBER_ENC(23, 2, 32),/* struct bpf_spin_lock l; */
	};

	return libbpf__load_raw_btf((char *)types, sizeof(types),
				     strs, sizeof(strs));
}

bool bpf_probe_map_type(enum bpf_map_type map_type, __u32 ifindex)
{
	int key_size, value_size, max_entries, map_flags;
	__u32 btf_key_type_id = 0, btf_value_type_id = 0;
	struct bpf_create_map_attr attr = {};
	int fd = -1, btf_fd = -1, fd_inner;

	key_size	= sizeof(__u32);
	value_size	= sizeof(__u32);
	max_entries	= 1;
	map_flags	= 0;

	switch (map_type) {
	case BPF_MAP_TYPE_STACK_TRACE:
		value_size	= sizeof(__u64);
		break;
	case BPF_MAP_TYPE_LPM_TRIE:
		key_size	= sizeof(__u64);
		value_size	= sizeof(__u64);
		map_flags	= BPF_F_NO_PREALLOC;
		break;
	case BPF_MAP_TYPE_CGROUP_STORAGE:
	case BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE:
		key_size	= sizeof(struct bpf_cgroup_storage_key);
		value_size	= sizeof(__u64);
		max_entries	= 0;
		break;
	case BPF_MAP_TYPE_QUEUE:
	case BPF_MAP_TYPE_STACK:
		key_size	= 0;
		break;
	case BPF_MAP_TYPE_SK_STORAGE:
		btf_key_type_id = 1;
		btf_value_type_id = 3;
		value_size = 8;
		max_entries = 0;
		map_flags = BPF_F_NO_PREALLOC;
		btf_fd = load_sk_storage_btf();
		if (btf_fd < 0)
			return false;
		break;
	case BPF_MAP_TYPE_UNSPEC:
	case BPF_MAP_TYPE_HASH:
	case BPF_MAP_TYPE_ARRAY:
	case BPF_MAP_TYPE_PROG_ARRAY:
	case BPF_MAP_TYPE_PERF_EVENT_ARRAY:
	case BPF_MAP_TYPE_PERCPU_HASH:
	case BPF_MAP_TYPE_PERCPU_ARRAY:
	case BPF_MAP_TYPE_CGROUP_ARRAY:
	case BPF_MAP_TYPE_LRU_HASH:
	case BPF_MAP_TYPE_LRU_PERCPU_HASH:
	case BPF_MAP_TYPE_ARRAY_OF_MAPS:
	case BPF_MAP_TYPE_HASH_OF_MAPS:
	case BPF_MAP_TYPE_DEVMAP:
	case BPF_MAP_TYPE_DEVMAP_HASH:
	case BPF_MAP_TYPE_SOCKMAP:
	case BPF_MAP_TYPE_CPUMAP:
	case BPF_MAP_TYPE_XSKMAP:
	case BPF_MAP_TYPE_SOCKHASH:
	case BPF_MAP_TYPE_REUSEPORT_SOCKARRAY:
	case BPF_MAP_TYPE_STRUCT_OPS:
	default:
		break;
	}

	if (map_type == BPF_MAP_TYPE_ARRAY_OF_MAPS ||
	    map_type == BPF_MAP_TYPE_HASH_OF_MAPS) {
		/* TODO: probe for device, once libbpf has a function to create
		 * map-in-map for offload
		 */
		if (ifindex)
			return false;

		fd_inner = bpf_create_map(BPF_MAP_TYPE_HASH,
					  sizeof(__u32), sizeof(__u32), 1, 0);
		if (fd_inner < 0)
			return false;
		fd = bpf_create_map_in_map(map_type, NULL, sizeof(__u32),
					   fd_inner, 1, 0);
		close(fd_inner);
	} else {
		/* Note: No other restriction on map type probes for offload */
		attr.map_type = map_type;
		attr.key_size = key_size;
		attr.value_size = value_size;
		attr.max_entries = max_entries;
		attr.map_flags = map_flags;
		attr.map_ifindex = ifindex;
		if (btf_fd >= 0) {
			attr.btf_fd = btf_fd;
			attr.btf_key_type_id = btf_key_type_id;
			attr.btf_value_type_id = btf_value_type_id;
		}

		fd = bpf_create_map_xattr(&attr);
	}
	if (fd >= 0)
		close(fd);
	if (btf_fd >= 0)
		close(btf_fd);

	return fd >= 0;
}

bool bpf_probe_helper(enum bpf_func_id id, enum bpf_prog_type prog_type,
		      __u32 ifindex)
{
	struct bpf_insn insns[2] = {
		BPF_EMIT_CALL(id),
		BPF_EXIT_INSN()
	};
	char buf[4096] = {};
	bool res;

	probe_load(prog_type, insns, ARRAY_SIZE(insns), buf, sizeof(buf),
		   ifindex);
	res = !grep(buf, "invalid func ") && !grep(buf, "unknown func ");

	if (ifindex) {
		switch (get_vendor_id(ifindex)) {
		case 0x19ee: /* Netronome specific */
			res = res && !grep(buf, "not supported by FW") &&
				!grep(buf, "unsupported function id");
			break;
		default:
			break;
		}
	}

	return res;
}

/*
 * Probe for availability of kernel commit (5.3):
 *
 * c04c0d2b968a ("bpf: increase complexity limit and maximum program size")
 */
bool bpf_probe_large_insn_limit(__u32 ifindex)
{
	struct bpf_insn insns[BPF_MAXINSNS + 1];
	int i;

	for (i = 0; i < BPF_MAXINSNS; i++)
		insns[i] = BPF_MOV64_IMM(BPF_REG_0, 1);
	insns[BPF_MAXINSNS] = BPF_EXIT_INSN();

	errno = 0;
	probe_load(BPF_PROG_TYPE_SCHED_CLS, insns, ARRAY_SIZE(insns), NULL, 0,
		   ifindex);

	return errno != E2BIG && errno != EINVAL;
}
Commit	Line	Data
1bf4b058 QM	1	// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
	2	/* Copyright (c) 2019 Netronome Systems, Inc. */
	3
	4	#include <errno.h>
2d3ea5e8 QM	5	#include <fcntl.h>
	6	#include <string.h>
	7	#include <stdlib.h>
1bf4b058	8	#include <unistd.h>
2d3ea5e8	9	#include <net/if.h>
1bf4b058 QM	10	#include <sys/utsname.h>
1bf4b058 QM	11
a19f89f3	12	#include <linux/btf.h>
1bf4b058 QM	13	#include <linux/filter.h>
	14	#include <linux/kernel.h>
	15
	16	#include "bpf.h"
	17	#include "libbpf.h"
d7c4b398	18	#include "libbpf_internal.h"
1bf4b058	19
1d1a3bcf AN	20	/* make sure libbpf doesn't use kernel-only integer typedefs */
	21	#pragma GCC poison u8 u16 u32 u64 s8 s16 s32 s64
	22
2d3ea5e8 QM	23	static bool grep(const char buffer, const char pattern)
	24	{
	25	return !!strstr(buffer, pattern);
	26	}
	27
	28	static int get_vendor_id(int ifindex)
	29	{
	30	char ifname[IF_NAMESIZE], path[64], buf[8];
	31	ssize_t len;
	32	int fd;
	33
	34	if (!if_indextoname(ifindex, ifname))
	35	return -1;
	36
	37	snprintf(path, sizeof(path), "/sys/class/net/%s/device/vendor", ifname);
	38
	39	fd = open(path, O_RDONLY);
	40	if (fd < 0)
	41	return -1;
	42
	43	len = read(fd, buf, sizeof(buf));
	44	close(fd);
	45	if (len < 0)
	46	return -1;
	47	if (len >= (ssize_t)sizeof(buf))
	48	return -1;
	49	buf[len] = '\0';
	50
	51	return strtol(buf, NULL, 0);
	52	}
	53
1bf4b058 QM	54	static int get_kernel_version(void)
	55	{
	56	int version, subversion, patchlevel;
	57	struct utsname utsn;
	58
	59	/* Return 0 on failure, and attempt to probe with empty kversion */
	60	if (uname(&utsn))
	61	return 0;
	62
	63	if (sscanf(utsn.release, "%d.%d.%d",
	64	&version, &subversion, &patchlevel) != 3)
	65	return 0;
	66
	67	return (version << 16) + (subversion << 8) + patchlevel;
	68	}
	69
	70	static void
	71	probe_load(enum bpf_prog_type prog_type, const struct bpf_insn *insns,
	72	size_t insns_cnt, char *buf, size_t buf_len, __u32 ifindex)
	73	{
	74	struct bpf_load_program_attr xattr = {};
	75	int fd;
	76
	77	switch (prog_type) {
	78	case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
	79	xattr.expected_attach_type = BPF_CGROUP_INET4_CONNECT;
	80	break;
	81	case BPF_PROG_TYPE_KPROBE:
	82	xattr.kern_version = get_kernel_version();
	83	break;
	84	case BPF_PROG_TYPE_UNSPEC:
	85	case BPF_PROG_TYPE_SOCKET_FILTER:
	86	case BPF_PROG_TYPE_SCHED_CLS:
	87	case BPF_PROG_TYPE_SCHED_ACT:
	88	case BPF_PROG_TYPE_TRACEPOINT:
	89	case BPF_PROG_TYPE_XDP:
	90	case BPF_PROG_TYPE_PERF_EVENT:
	91	case BPF_PROG_TYPE_CGROUP_SKB:
	92	case BPF_PROG_TYPE_CGROUP_SOCK:
	93	case BPF_PROG_TYPE_LWT_IN:
	94	case BPF_PROG_TYPE_LWT_OUT:
	95	case BPF_PROG_TYPE_LWT_XMIT:
	96	case BPF_PROG_TYPE_SOCK_OPS:
	97	case BPF_PROG_TYPE_SK_SKB:
	98	case BPF_PROG_TYPE_CGROUP_DEVICE:
	99	case BPF_PROG_TYPE_SK_MSG:
	100	case BPF_PROG_TYPE_RAW_TRACEPOINT:
4635b0ae	101	case BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE:
1bf4b058 QM	102	case BPF_PROG_TYPE_LWT_SEG6LOCAL:
	103	case BPF_PROG_TYPE_LIRC_MODE2:
	104	case BPF_PROG_TYPE_SK_REUSEPORT:
	105	case BPF_PROG_TYPE_FLOW_DISSECTOR:
063cc9f0	106	case BPF_PROG_TYPE_CGROUP_SYSCTL:
4cdbfb59	107	case BPF_PROG_TYPE_CGROUP_SOCKOPT:
12a8654b	108	case BPF_PROG_TYPE_TRACING:
590a0088	109	case BPF_PROG_TYPE_STRUCT_OPS:
2db6eab1	110	case BPF_PROG_TYPE_EXT:
fc611f47	111	case BPF_PROG_TYPE_LSM:
1bf4b058 QM	112	default:
	113	break;
	114	}
	115
	116	xattr.prog_type = prog_type;
	117	xattr.insns = insns;
	118	xattr.insns_cnt = insns_cnt;
	119	xattr.license = "GPL";
	120	xattr.prog_ifindex = ifindex;
	121
	122	fd = bpf_load_program_xattr(&xattr, buf, buf_len);
	123	if (fd >= 0)
	124	close(fd);
	125	}
	126
	127	bool bpf_probe_prog_type(enum bpf_prog_type prog_type, __u32 ifindex)
	128	{
	129	struct bpf_insn insns[2] = {
	130	BPF_MOV64_IMM(BPF_REG_0, 0),
	131	BPF_EXIT_INSN()
	132	};
	133
	134	if (ifindex && prog_type == BPF_PROG_TYPE_SCHED_CLS)
	135	/* nfp returns -EINVAL on exit(0) with TC offload */
	136	insns[0].imm = 2;
	137
	138	errno = 0;
	139	probe_load(prog_type, insns, ARRAY_SIZE(insns), NULL, 0, ifindex);
	140
	141	return errno != EINVAL && errno != EOPNOTSUPP;
	142	}
f99e1663	143
cfd49210 MR	144	int libbpf__load_raw_btf(const char *raw_types, size_t types_len,
cfd49210 MR	145	const char *str_sec, size_t str_len)
a19f89f3	146	{
d7c4b398 AN	147	struct btf_header hdr = {
	148	.magic = BTF_MAGIC,
	149	.version = BTF_VERSION,
	150	.hdr_len = sizeof(struct btf_header),
	151	.type_len = types_len,
	152	.str_off = types_len,
	153	.str_len = str_len,
	154	};
	155	int btf_fd, btf_len;
	156	__u8 *raw_btf;
	157
	158	btf_len = hdr.hdr_len + hdr.type_len + hdr.str_len;
	159	raw_btf = malloc(btf_len);
	160	if (!raw_btf)
	161	return -ENOMEM;
	162
	163	memcpy(raw_btf, &hdr, sizeof(hdr));
	164	memcpy(raw_btf + hdr.hdr_len, raw_types, hdr.type_len);
	165	memcpy(raw_btf + hdr.hdr_len + hdr.type_len, str_sec, hdr.str_len);
	166
	167	btf_fd = bpf_load_btf(raw_btf, btf_len, NULL, 0, false);
d7c4b398	168
d7c4b398	169	free(raw_btf);
cfd49210	170	return btf_fd;
d7c4b398 AN	171	}
	172
	173	static int load_sk_storage_btf(void)
	174	{
	175	const char strs[] = "\0bpf_spin_lock\0val\0cnt\0l";
a19f89f3 MKL	176	/* struct bpf_spin_lock {
	177	* int val;
	178	* };
	179	* struct val {
	180	* int cnt;
	181	* struct bpf_spin_lock l;
	182	* };
	183	*/
d7c4b398	184	__u32 types[] = {
a19f89f3 MKL	185	/* int */
	186	BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 32, 4), /* [1] */
	187	/* struct bpf_spin_lock / / [2] */
	188	BTF_TYPE_ENC(1, BTF_INFO_ENC(BTF_KIND_STRUCT, 0, 1), 4),
	189	BTF_MEMBER_ENC(15, 1, 0), /* int val; */
	190	/* struct val / / [3] */
	191	BTF_TYPE_ENC(15, BTF_INFO_ENC(BTF_KIND_STRUCT, 0, 2), 8),
	192	BTF_MEMBER_ENC(19, 1, 0), /* int cnt; */
	193	BTF_MEMBER_ENC(23, 2, 32),/* struct bpf_spin_lock l; */
	194	};
a19f89f3	195
cfd49210	196	return libbpf__load_raw_btf((char *)types, sizeof(types),
d7c4b398	197	strs, sizeof(strs));
a19f89f3 MKL	198	}
a19f89f3 MKL	199
f99e1663 QM	200	bool bpf_probe_map_type(enum bpf_map_type map_type, __u32 ifindex)
	201	{
	202	int key_size, value_size, max_entries, map_flags;
a19f89f3	203	__u32 btf_key_type_id = 0, btf_value_type_id = 0;
f99e1663	204	struct bpf_create_map_attr attr = {};
a19f89f3	205	int fd = -1, btf_fd = -1, fd_inner;
f99e1663 QM	206
	207	key_size = sizeof(__u32);
	208	value_size = sizeof(__u32);
	209	max_entries = 1;
	210	map_flags = 0;
	211
	212	switch (map_type) {
	213	case BPF_MAP_TYPE_STACK_TRACE:
	214	value_size = sizeof(__u64);
	215	break;
	216	case BPF_MAP_TYPE_LPM_TRIE:
	217	key_size = sizeof(__u64);
	218	value_size = sizeof(__u64);
	219	map_flags = BPF_F_NO_PREALLOC;
	220	break;
	221	case BPF_MAP_TYPE_CGROUP_STORAGE:
	222	case BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE:
	223	key_size = sizeof(struct bpf_cgroup_storage_key);
	224	value_size = sizeof(__u64);
	225	max_entries = 0;
	226	break;
	227	case BPF_MAP_TYPE_QUEUE:
	228	case BPF_MAP_TYPE_STACK:
	229	key_size = 0;
	230	break;
a19f89f3 MKL	231	case BPF_MAP_TYPE_SK_STORAGE:
	232	btf_key_type_id = 1;
	233	btf_value_type_id = 3;
	234	value_size = 8;
	235	max_entries = 0;
	236	map_flags = BPF_F_NO_PREALLOC;
d7c4b398	237	btf_fd = load_sk_storage_btf();
a19f89f3 MKL	238	if (btf_fd < 0)
	239	return false;
	240	break;
f99e1663 QM	241	case BPF_MAP_TYPE_UNSPEC:
	242	case BPF_MAP_TYPE_HASH:
	243	case BPF_MAP_TYPE_ARRAY:
	244	case BPF_MAP_TYPE_PROG_ARRAY:
	245	case BPF_MAP_TYPE_PERF_EVENT_ARRAY:
	246	case BPF_MAP_TYPE_PERCPU_HASH:
	247	case BPF_MAP_TYPE_PERCPU_ARRAY:
	248	case BPF_MAP_TYPE_CGROUP_ARRAY:
	249	case BPF_MAP_TYPE_LRU_HASH:
	250	case BPF_MAP_TYPE_LRU_PERCPU_HASH:
	251	case BPF_MAP_TYPE_ARRAY_OF_MAPS:
	252	case BPF_MAP_TYPE_HASH_OF_MAPS:
	253	case BPF_MAP_TYPE_DEVMAP:
e4234619	254	case BPF_MAP_TYPE_DEVMAP_HASH:
f99e1663 QM	255	case BPF_MAP_TYPE_SOCKMAP:
	256	case BPF_MAP_TYPE_CPUMAP:
	257	case BPF_MAP_TYPE_XSKMAP:
	258	case BPF_MAP_TYPE_SOCKHASH:
	259	case BPF_MAP_TYPE_REUSEPORT_SOCKARRAY:
590a0088	260	case BPF_MAP_TYPE_STRUCT_OPS:
f99e1663 QM	261	default:
	262	break;
	263	}
	264
	265	if (map_type == BPF_MAP_TYPE_ARRAY_OF_MAPS \|\|
	266	map_type == BPF_MAP_TYPE_HASH_OF_MAPS) {
	267	/* TODO: probe for device, once libbpf has a function to create
	268	* map-in-map for offload
	269	*/
	270	if (ifindex)
	271	return false;
	272
	273	fd_inner = bpf_create_map(BPF_MAP_TYPE_HASH,
	274	sizeof(__u32), sizeof(__u32), 1, 0);
	275	if (fd_inner < 0)
	276	return false;
	277	fd = bpf_create_map_in_map(map_type, NULL, sizeof(__u32),
	278	fd_inner, 1, 0);
	279	close(fd_inner);
	280	} else {
	281	/* Note: No other restriction on map type probes for offload */
	282	attr.map_type = map_type;
	283	attr.key_size = key_size;
	284	attr.value_size = value_size;
	285	attr.max_entries = max_entries;
	286	attr.map_flags = map_flags;
	287	attr.map_ifindex = ifindex;
a19f89f3 MKL	288	if (btf_fd >= 0) {
	289	attr.btf_fd = btf_fd;
	290	attr.btf_key_type_id = btf_key_type_id;
	291	attr.btf_value_type_id = btf_value_type_id;
	292	}
f99e1663 QM	293
	294	fd = bpf_create_map_xattr(&attr);
	295	}
	296	if (fd >= 0)
	297	close(fd);
a19f89f3 MKL	298	if (btf_fd >= 0)
a19f89f3 MKL	299	close(btf_fd);
f99e1663 QM	300
	301	return fd >= 0;
	302	}
2d3ea5e8 QM	303
	304	bool bpf_probe_helper(enum bpf_func_id id, enum bpf_prog_type prog_type,
	305	__u32 ifindex)
	306	{
	307	struct bpf_insn insns[2] = {
	308	BPF_EMIT_CALL(id),
	309	BPF_EXIT_INSN()
	310	};
	311	char buf[4096] = {};
	312	bool res;
	313
	314	probe_load(prog_type, insns, ARRAY_SIZE(insns), buf, sizeof(buf),
	315	ifindex);
	316	res = !grep(buf, "invalid func ") && !grep(buf, "unknown func ");
	317
	318	if (ifindex) {
	319	switch (get_vendor_id(ifindex)) {
	320	case 0x19ee: /* Netronome specific */
	321	res = res && !grep(buf, "not supported by FW") &&
	322	!grep(buf, "unsupported function id");
	323	break;
	324	default:
	325	break;
	326	}
	327	}
	328
	329	return res;
	330	}
5ff05120 MR	331
	332	/*
	333	* Probe for availability of kernel commit (5.3):
	334	*
	335	* c04c0d2b968a ("bpf: increase complexity limit and maximum program size")
	336	*/
	337	bool bpf_probe_large_insn_limit(__u32 ifindex)
	338	{
	339	struct bpf_insn insns[BPF_MAXINSNS + 1];
	340	int i;
	341
	342	for (i = 0; i < BPF_MAXINSNS; i++)
	343	insns[i] = BPF_MOV64_IMM(BPF_REG_0, 1);
	344	insns[BPF_MAXINSNS] = BPF_EXIT_INSN();
	345
	346	errno = 0;
	347	probe_load(BPF_PROG_TYPE_SCHED_CLS, insns, ARRAY_SIZE(insns), NULL, 0,
	348	ifindex);
	349
	350	return errno != E2BIG && errno != EINVAL;
	351	}