[linux.git] / tools / bpf / bpftool / common.c

/*
 * Copyright (C) 2017-2018 Netronome Systems, Inc.
 *
 * This software is dual licensed under the GNU General License Version 2,
 * June 1991 as shown in the file COPYING in the top-level directory of this
 * source tree or the BSD 2-Clause License provided below.  You have the
 * option to license this software under the complete terms of either license.
 *
 * The BSD 2-Clause License:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      1. Redistributions of source code must retain the above
 *         copyright notice, this list of conditions and the following
 *         disclaimer.
 *
 *      2. Redistributions in binary form must reproduce the above
 *         copyright notice, this list of conditions and the following
 *         disclaimer in the documentation and/or other materials
 *         provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <fts.h>
#include <libgen.h>
#include <mntent.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <linux/limits.h>
#include <linux/magic.h>
#include <net/if.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/vfs.h>

#include <bpf.h>

#include "main.h"

#ifndef BPF_FS_MAGIC
#define BPF_FS_MAGIC		0xcafe4a11
#endif

void p_err(const char *fmt, ...)
{
	va_list ap;

	va_start(ap, fmt);
	if (json_output) {
		jsonw_start_object(json_wtr);
		jsonw_name(json_wtr, "error");
		jsonw_vprintf_enquote(json_wtr, fmt, ap);
		jsonw_end_object(json_wtr);
	} else {
		fprintf(stderr, "Error: ");
		vfprintf(stderr, fmt, ap);
		fprintf(stderr, "\n");
	}
	va_end(ap);
}

void p_info(const char *fmt, ...)
{
	va_list ap;

	if (json_output)
		return;

	va_start(ap, fmt);
	vfprintf(stderr, fmt, ap);
	fprintf(stderr, "\n");
	va_end(ap);
}

static bool is_bpffs(char *path)
{
	struct statfs st_fs;

	if (statfs(path, &st_fs) < 0)
		return false;

	return (unsigned long)st_fs.f_type == BPF_FS_MAGIC;
}

static int mnt_bpffs(const char *target, char *buff, size_t bufflen)
{
	bool bind_done = false;

	while (mount("", target, "none", MS_PRIVATE | MS_REC, NULL)) {
		if (errno != EINVAL || bind_done) {
			snprintf(buff, bufflen,
				 "mount --make-private %s failed: %s",
				 target, strerror(errno));
			return -1;
		}

		if (mount(target, target, "none", MS_BIND, NULL)) {
			snprintf(buff, bufflen,
				 "mount --bind %s %s failed: %s",
				 target, target, strerror(errno));
			return -1;
		}

		bind_done = true;
	}

	if (mount("bpf", target, "bpf", 0, "mode=0700")) {
		snprintf(buff, bufflen, "mount -t bpf bpf %s failed: %s",
			 target, strerror(errno));
		return -1;
	}

	return 0;
}

int open_obj_pinned(char *path, bool quiet)
{
	int fd;

	fd = bpf_obj_get(path);
	if (fd < 0) {
		if (!quiet)
			p_err("bpf obj get (%s): %s", path,
			      errno == EACCES && !is_bpffs(dirname(path)) ?
			    "directory not in bpf file system (bpffs)" :
			    strerror(errno));
		return -1;
	}

	return fd;
}

int open_obj_pinned_any(char *path, enum bpf_obj_type exp_type)
{
	enum bpf_obj_type type;
	int fd;

	fd = open_obj_pinned(path, false);
	if (fd < 0)
		return -1;

	type = get_fd_type(fd);
	if (type < 0) {
		close(fd);
		return type;
	}
	if (type != exp_type) {
		p_err("incorrect object type: %s", get_fd_type_name(type));
		close(fd);
		return -1;
	}

	return fd;
}

int do_pin_fd(int fd, const char *name)
{
	char err_str[ERR_MAX_LEN];
	char *file;
	char *dir;
	int err = 0;

	err = bpf_obj_pin(fd, name);
	if (!err)
		goto out;

	file = malloc(strlen(name) + 1);
	strcpy(file, name);
	dir = dirname(file);

	if (errno != EPERM || is_bpffs(dir)) {
		p_err("can't pin the object (%s): %s", name, strerror(errno));
		goto out_free;
	}

	/* Attempt to mount bpffs, then retry pinning. */
	err = mnt_bpffs(dir, err_str, ERR_MAX_LEN);
	if (!err) {
		err = bpf_obj_pin(fd, name);
		if (err)
			p_err("can't pin the object (%s): %s", name,
			      strerror(errno));
	} else {
		err_str[ERR_MAX_LEN - 1] = '\0';
		p_err("can't mount BPF file system to pin the object (%s): %s",
		      name, err_str);
	}

out_free:
	free(file);
out:
	return err;
}

int do_pin_any(int argc, char **argv, int (*get_fd_by_id)(__u32))
{
	unsigned int id;
	char *endptr;
	int err;
	int fd;

	if (argc < 3) {
		p_err("too few arguments, id ID and FILE path is required");
		return -1;
	} else if (argc > 3) {
		p_err("too many arguments");
		return -1;
	}

	if (!is_prefix(*argv, "id")) {
		p_err("expected 'id' got %s", *argv);
		return -1;
	}
	NEXT_ARG();

	id = strtoul(*argv, &endptr, 0);
	if (*endptr) {
		p_err("can't parse %s as ID", *argv);
		return -1;
	}
	NEXT_ARG();

	fd = get_fd_by_id(id);
	if (fd < 0) {
		p_err("can't get prog by id (%u): %s", id, strerror(errno));
		return -1;
	}

	err = do_pin_fd(fd, *argv);

	close(fd);
	return err;
}

const char *get_fd_type_name(enum bpf_obj_type type)
{
	static const char * const names[] = {
		[BPF_OBJ_UNKNOWN]	= "unknown",
		[BPF_OBJ_PROG]		= "prog",
		[BPF_OBJ_MAP]		= "map",
	};

	if (type < 0 || type >= ARRAY_SIZE(names) || !names[type])
		return names[BPF_OBJ_UNKNOWN];

	return names[type];
}

int get_fd_type(int fd)
{
	char path[PATH_MAX];
	char buf[512];
	ssize_t n;

	snprintf(path, sizeof(path), "/proc/%d/fd/%d", getpid(), fd);

	n = readlink(path, buf, sizeof(buf));
	if (n < 0) {
		p_err("can't read link type: %s", strerror(errno));
		return -1;
	}
	if (n == sizeof(path)) {
		p_err("can't read link type: path too long!");
		return -1;
	}

	if (strstr(buf, "bpf-map"))
		return BPF_OBJ_MAP;
	else if (strstr(buf, "bpf-prog"))
		return BPF_OBJ_PROG;

	return BPF_OBJ_UNKNOWN;
}

char *get_fdinfo(int fd, const char *key)
{
	char path[PATH_MAX];
	char *line = NULL;
	size_t line_n = 0;
	ssize_t n;
	FILE *fdi;

	snprintf(path, sizeof(path), "/proc/%d/fdinfo/%d", getpid(), fd);

	fdi = fopen(path, "r");
	if (!fdi) {
		p_err("can't open fdinfo: %s", strerror(errno));
		return NULL;
	}

	while ((n = getline(&line, &line_n, fdi)) > 0) {
		char *value;
		int len;

		if (!strstr(line, key))
			continue;

		fclose(fdi);

		value = strchr(line, '\t');
		if (!value || !value[1]) {
			p_err("malformed fdinfo!?");
			free(line);
			return NULL;
		}
		value++;

		len = strlen(value);
		memmove(line, value, len);
		line[len - 1] = '\0';

		return line;
	}

	p_err("key '%s' not found in fdinfo", key);
	free(line);
	fclose(fdi);
	return NULL;
}

void print_data_json(uint8_t *data, size_t len)
{
	unsigned int i;

	jsonw_start_array(json_wtr);
	for (i = 0; i < len; i++)
		jsonw_printf(json_wtr, "%d", data[i]);
	jsonw_end_array(json_wtr);
}

void print_hex_data_json(uint8_t *data, size_t len)
{
	unsigned int i;

	jsonw_start_array(json_wtr);
	for (i = 0; i < len; i++)
		jsonw_printf(json_wtr, "\"0x%02hhx\"", data[i]);
	jsonw_end_array(json_wtr);
}

int build_pinned_obj_table(struct pinned_obj_table *tab,
			   enum bpf_obj_type type)
{
	struct bpf_prog_info pinned_info = {};
	struct pinned_obj *obj_node = NULL;
	__u32 len = sizeof(pinned_info);
	struct mntent *mntent = NULL;
	enum bpf_obj_type objtype;
	FILE *mntfile = NULL;
	FTSENT *ftse = NULL;
	FTS *fts = NULL;
	int fd, err;

	mntfile = setmntent("/proc/mounts", "r");
	if (!mntfile)
		return -1;

	while ((mntent = getmntent(mntfile))) {
		char *path[] = { mntent->mnt_dir, NULL };

		if (strncmp(mntent->mnt_type, "bpf", 3) != 0)
			continue;

		fts = fts_open(path, 0, NULL);
		if (!fts)
			continue;

		while ((ftse = fts_read(fts))) {
			if (!(ftse->fts_info & FTS_F))
				continue;
			fd = open_obj_pinned(ftse->fts_path, true);
			if (fd < 0)
				continue;

			objtype = get_fd_type(fd);
			if (objtype != type) {
				close(fd);
				continue;
			}
			memset(&pinned_info, 0, sizeof(pinned_info));
			err = bpf_obj_get_info_by_fd(fd, &pinned_info, &len);
			if (err) {
				close(fd);
				continue;
			}

			obj_node = malloc(sizeof(*obj_node));
			if (!obj_node) {
				close(fd);
				fts_close(fts);
				fclose(mntfile);
				return -1;
			}

			memset(obj_node, 0, sizeof(*obj_node));
			obj_node->id = pinned_info.id;
			obj_node->path = strdup(ftse->fts_path);
			hash_add(tab->table, &obj_node->hash, obj_node->id);

			close(fd);
		}
		fts_close(fts);
	}
	fclose(mntfile);
	return 0;
}

void delete_pinned_obj_table(struct pinned_obj_table *tab)
{
	struct pinned_obj *obj;
	struct hlist_node *tmp;
	unsigned int bkt;

	hash_for_each_safe(tab->table, bkt, tmp, obj, hash) {
		hash_del(&obj->hash);
		free(obj->path);
		free(obj);
	}
}

unsigned int get_page_size(void)
{
	static int result;

	if (!result)
		result = getpagesize();
	return result;
}

unsigned int get_possible_cpus(void)
{
	static unsigned int result;
	char buf[128];
	long int n;
	char *ptr;
	int fd;

	if (result)
		return result;

	fd = open("/sys/devices/system/cpu/possible", O_RDONLY);
	if (fd < 0) {
		p_err("can't open sysfs possible cpus");
		exit(-1);
	}

	n = read(fd, buf, sizeof(buf));
	if (n < 2) {
		p_err("can't read sysfs possible cpus");
		exit(-1);
	}
	close(fd);

	if (n == sizeof(buf)) {
		p_err("read sysfs possible cpus overflow");
		exit(-1);
	}

	ptr = buf;
	n = 0;
	while (*ptr && *ptr != '\n') {
		unsigned int a, b;

		if (sscanf(ptr, "%u-%u", &a, &b) == 2) {
			n += b - a + 1;

			ptr = strchr(ptr, '-') + 1;
		} else if (sscanf(ptr, "%u", &a) == 1) {
			n++;
		} else {
			assert(0);
		}

		while (isdigit(*ptr))
			ptr++;
		if (*ptr == ',')
			ptr++;
	}

	result = n;

	return result;
}

static char *
ifindex_to_name_ns(__u32 ifindex, __u32 ns_dev, __u32 ns_ino, char *buf)
{
	struct stat st;
	int err;

	err = stat("/proc/self/ns/net", &st);
	if (err) {
		p_err("Can't stat /proc/self: %s", strerror(errno));
		return NULL;
	}

	if (st.st_dev != ns_dev || st.st_ino != ns_ino)
		return NULL;

	return if_indextoname(ifindex, buf);
}

static int read_sysfs_hex_int(char *path)
{
	char vendor_id_buf[8];
	int len;
	int fd;

	fd = open(path, O_RDONLY);
	if (fd < 0) {
		p_err("Can't open %s: %s", path, strerror(errno));
		return -1;
	}

	len = read(fd, vendor_id_buf, sizeof(vendor_id_buf));
	close(fd);
	if (len < 0) {
		p_err("Can't read %s: %s", path, strerror(errno));
		return -1;
	}
	if (len >= (int)sizeof(vendor_id_buf)) {
		p_err("Value in %s too long", path);
		return -1;
	}

	vendor_id_buf[len] = 0;

	return strtol(vendor_id_buf, NULL, 0);
}

static int read_sysfs_netdev_hex_int(char *devname, const char *entry_name)
{
	char full_path[64];

	snprintf(full_path, sizeof(full_path), "/sys/class/net/%s/device/%s",
		 devname, entry_name);

	return read_sysfs_hex_int(full_path);
}

const char *
ifindex_to_bfd_params(__u32 ifindex, __u64 ns_dev, __u64 ns_ino,
		      const char **opt)
{
	char devname[IF_NAMESIZE];
	int vendor_id;
	int device_id;

	if (!ifindex_to_name_ns(ifindex, ns_dev, ns_ino, devname)) {
		p_err("Can't get net device name for ifindex %d: %s", ifindex,
		      strerror(errno));
		return NULL;
	}

	vendor_id = read_sysfs_netdev_hex_int(devname, "vendor");
	if (vendor_id < 0) {
		p_err("Can't get device vendor id for %s", devname);
		return NULL;
	}

	switch (vendor_id) {
	case 0x19ee:
		device_id = read_sysfs_netdev_hex_int(devname, "device");
		if (device_id != 0x4000 &&
		    device_id != 0x6000 &&
		    device_id != 0x6003)
			p_info("Unknown NFP device ID, assuming it is NFP-6xxx arch");
		*opt = "ctx4";
		return "NFP-6xxx";
	default:
		p_err("Can't get bfd arch name for device vendor id 0x%04x",
		      vendor_id);
		return NULL;
	}
}

void print_dev_plain(__u32 ifindex, __u64 ns_dev, __u64 ns_inode)
{
	char name[IF_NAMESIZE];

	if (!ifindex)
		return;

	printf(" dev ");
	if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name))
		printf("%s", name);
	else
		printf("ifindex %u ns_dev %llu ns_ino %llu",
		       ifindex, ns_dev, ns_inode);
}

void print_dev_json(__u32 ifindex, __u64 ns_dev, __u64 ns_inode)
{
	char name[IF_NAMESIZE];

	if (!ifindex)
		return;

	jsonw_name(json_wtr, "dev");
	jsonw_start_object(json_wtr);
	jsonw_uint_field(json_wtr, "ifindex", ifindex);
	jsonw_uint_field(json_wtr, "ns_dev", ns_dev);
	jsonw_uint_field(json_wtr, "ns_inode", ns_inode);
	if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name))
		jsonw_string_field(json_wtr, "ifname", name);
	jsonw_end_object(json_wtr);
}

int parse_u32_arg(int *argc, char ***argv, __u32 *val, const char *what)
{
	char *endptr;

	NEXT_ARGP();

	if (*val) {
		p_err("%s already specified", what);
		return -1;
	}

	*val = strtoul(**argv, &endptr, 0);
	if (*endptr) {
		p_err("can't parse %s as %s", **argv, what);
		return -1;
	}
	NEXT_ARGP();

	return 0;
}
Commit	Line	Data
71bb428f	1	/*
e64d5256	2	* Copyright (C) 2017-2018 Netronome Systems, Inc.
71bb428f JK	3	*
	4	* This software is dual licensed under the GNU General License Version 2,
	5	* June 1991 as shown in the file COPYING in the top-level directory of this
	6	* source tree or the BSD 2-Clause License provided below. You have the
	7	* option to license this software under the complete terms of either license.
	8	*
	9	* The BSD 2-Clause License:
	10	*
	11	* Redistribution and use in source and binary forms, with or
	12	* without modification, are permitted provided that the following
	13	* conditions are met:
	14	*
	15	* 1. Redistributions of source code must retain the above
	16	* copyright notice, this list of conditions and the following
	17	* disclaimer.
	18	*
	19	* 2. Redistributions in binary form must reproduce the above
	20	* copyright notice, this list of conditions and the following
	21	* disclaimer in the documentation and/or other materials
	22	* provided with the distribution.
	23	*
	24	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	25	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	26	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	27	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	28	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	29	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	30	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	31	* SOFTWARE.
	32	*/
	33
e64d5256	34	#include <ctype.h>
71bb428f	35	#include <errno.h>
e6593596	36	#include <fcntl.h>
4990f1f4	37	#include <fts.h>
71bb428f	38	#include <libgen.h>
4990f1f4	39	#include <mntent.h>
71bb428f JK	40	#include <stdbool.h>
	41	#include <stdio.h>
	42	#include <stdlib.h>
	43	#include <string.h>
	44	#include <unistd.h>
	45	#include <linux/limits.h>
	46	#include <linux/magic.h>
52262210	47	#include <net/if.h>
3fc27b71	48	#include <sys/mount.h>
52262210	49	#include <sys/stat.h>
71bb428f JK	50	#include <sys/types.h>
	51	#include <sys/vfs.h>
	52
	53	#include <bpf.h>
	54
	55	#include "main.h"
	56
20d5de51 JB	57	#ifndef BPF_FS_MAGIC
	58	#define BPF_FS_MAGIC 0xcafe4a11
	59	#endif
	60
0b1c27db QM	61	void p_err(const char *fmt, ...)
	62	{
	63	va_list ap;
	64
	65	va_start(ap, fmt);
	66	if (json_output) {
	67	jsonw_start_object(json_wtr);
	68	jsonw_name(json_wtr, "error");
	69	jsonw_vprintf_enquote(json_wtr, fmt, ap);
	70	jsonw_end_object(json_wtr);
	71	} else {
	72	fprintf(stderr, "Error: ");
	73	vfprintf(stderr, fmt, ap);
	74	fprintf(stderr, "\n");
	75	}
	76	va_end(ap);
	77	}
	78
	79	void p_info(const char *fmt, ...)
	80	{
	81	va_list ap;
	82
	83	if (json_output)
	84	return;
	85
	86	va_start(ap, fmt);
	87	vfprintf(stderr, fmt, ap);
	88	fprintf(stderr, "\n");
	89	va_end(ap);
	90	}
	91
71bb428f JK	92	static bool is_bpffs(char *path)
	93	{
	94	struct statfs st_fs;
	95
	96	if (statfs(path, &st_fs) < 0)
	97	return false;
	98
	99	return (unsigned long)st_fs.f_type == BPF_FS_MAGIC;
	100	}
	101
3fc27b71 QM	102	static int mnt_bpffs(const char target, char buff, size_t bufflen)
	103	{
	104	bool bind_done = false;
	105
	106	while (mount("", target, "none", MS_PRIVATE \| MS_REC, NULL)) {
	107	if (errno != EINVAL \|\| bind_done) {
	108	snprintf(buff, bufflen,
	109	"mount --make-private %s failed: %s",
	110	target, strerror(errno));
	111	return -1;
	112	}
	113
	114	if (mount(target, target, "none", MS_BIND, NULL)) {
	115	snprintf(buff, bufflen,
	116	"mount --bind %s %s failed: %s",
	117	target, target, strerror(errno));
	118	return -1;
	119	}
	120
	121	bind_done = true;
	122	}
	123
	124	if (mount("bpf", target, "bpf", 0, "mode=0700")) {
	125	snprintf(buff, bufflen, "mount -t bpf bpf %s failed: %s",
	126	target, strerror(errno));
	127	return -1;
	128	}
	129
	130	return 0;
	131	}
	132
f120919f	133	int open_obj_pinned(char *path, bool quiet)
71bb428f	134	{
71bb428f JK	135	int fd;
	136
	137	fd = bpf_obj_get(path);
	138	if (fd < 0) {
f120919f QM	139	if (!quiet)
	140	p_err("bpf obj get (%s): %s", path,
	141	errno == EACCES && !is_bpffs(dirname(path)) ?
	142	"directory not in bpf file system (bpffs)" :
	143	strerror(errno));
71bb428f JK	144	return -1;
	145	}
	146
18527196 PB	147	return fd;
	148	}
	149
	150	int open_obj_pinned_any(char *path, enum bpf_obj_type exp_type)
	151	{
	152	enum bpf_obj_type type;
	153	int fd;
	154
f120919f	155	fd = open_obj_pinned(path, false);
18527196 PB	156	if (fd < 0)
	157	return -1;
	158
71bb428f JK	159	type = get_fd_type(fd);
	160	if (type < 0) {
	161	close(fd);
	162	return type;
	163	}
	164	if (type != exp_type) {
9a5ab8bf	165	p_err("incorrect object type: %s", get_fd_type_name(type));
71bb428f JK	166	close(fd);
	167	return -1;
	168	}
	169
	170	return fd;
	171	}
	172
49a086c2	173	int do_pin_fd(int fd, const char *name)
71bb428f	174	{
3fc27b71	175	char err_str[ERR_MAX_LEN];
3fc27b71 QM	176	char *file;
3fc27b71 QM	177	char *dir;
49a086c2 RG	178	int err = 0;
	179
	180	err = bpf_obj_pin(fd, name);
	181	if (!err)
	182	goto out;
	183
	184	file = malloc(strlen(name) + 1);
	185	strcpy(file, name);
	186	dir = dirname(file);
	187
	188	if (errno != EPERM \|\| is_bpffs(dir)) {
	189	p_err("can't pin the object (%s): %s", name, strerror(errno));
	190	goto out_free;
	191	}
	192
	193	/* Attempt to mount bpffs, then retry pinning. */
	194	err = mnt_bpffs(dir, err_str, ERR_MAX_LEN);
	195	if (!err) {
	196	err = bpf_obj_pin(fd, name);
	197	if (err)
	198	p_err("can't pin the object (%s): %s", name,
	199	strerror(errno));
	200	} else {
	201	err_str[ERR_MAX_LEN - 1] = '\0';
	202	p_err("can't mount BPF file system to pin the object (%s): %s",
	203	name, err_str);
	204	}
	205
	206	out_free:
	207	free(file);
	208	out:
	209	return err;
	210	}
	211
	212	int do_pin_any(int argc, char *argv, int (get_fd_by_id)(__u32))
	213	{
	214	unsigned int id;
	215	char *endptr;
71bb428f JK	216	int err;
	217	int fd;
	218
759b94a0 TS	219	if (argc < 3) {
	220	p_err("too few arguments, id ID and FILE path is required");
	221	return -1;
	222	} else if (argc > 3) {
	223	p_err("too many arguments");
	224	return -1;
	225	}
	226
71bb428f	227	if (!is_prefix(*argv, "id")) {
9a5ab8bf	228	p_err("expected 'id' got %s", *argv);
71bb428f JK	229	return -1;
	230	}
	231	NEXT_ARG();
	232
	233	id = strtoul(*argv, &endptr, 0);
	234	if (*endptr) {
9a5ab8bf	235	p_err("can't parse %s as ID", *argv);
71bb428f JK	236	return -1;
	237	}
	238	NEXT_ARG();
	239
71bb428f JK	240	fd = get_fd_by_id(id);
71bb428f JK	241	if (fd < 0) {
9a5ab8bf	242	p_err("can't get prog by id (%u): %s", id, strerror(errno));
71bb428f JK	243	return -1;
	244	}
	245
49a086c2	246	err = do_pin_fd(fd, *argv);
71bb428f	247
3fc27b71 QM	248	close(fd);
3fc27b71 QM	249	return err;
71bb428f JK	250	}
	251
	252	const char *get_fd_type_name(enum bpf_obj_type type)
	253	{
	254	static const char * const names[] = {
	255	[BPF_OBJ_UNKNOWN] = "unknown",
	256	[BPF_OBJ_PROG] = "prog",
	257	[BPF_OBJ_MAP] = "map",
	258	};
	259
	260	if (type < 0 \|\| type >= ARRAY_SIZE(names) \|\| !names[type])
	261	return names[BPF_OBJ_UNKNOWN];
	262
	263	return names[type];
	264	}
	265
	266	int get_fd_type(int fd)
	267	{
	268	char path[PATH_MAX];
	269	char buf[512];
	270	ssize_t n;
	271
	272	snprintf(path, sizeof(path), "/proc/%d/fd/%d", getpid(), fd);
	273
	274	n = readlink(path, buf, sizeof(buf));
	275	if (n < 0) {
9a5ab8bf	276	p_err("can't read link type: %s", strerror(errno));
71bb428f JK	277	return -1;
	278	}
	279	if (n == sizeof(path)) {
9a5ab8bf	280	p_err("can't read link type: path too long!");
71bb428f JK	281	return -1;
	282	}
	283
	284	if (strstr(buf, "bpf-map"))
	285	return BPF_OBJ_MAP;
	286	else if (strstr(buf, "bpf-prog"))
	287	return BPF_OBJ_PROG;
	288
	289	return BPF_OBJ_UNKNOWN;
	290	}
	291
	292	char get_fdinfo(int fd, const char key)
	293	{
	294	char path[PATH_MAX];
	295	char *line = NULL;
	296	size_t line_n = 0;
	297	ssize_t n;
	298	FILE *fdi;
	299
	300	snprintf(path, sizeof(path), "/proc/%d/fdinfo/%d", getpid(), fd);
	301
	302	fdi = fopen(path, "r");
	303	if (!fdi) {
9a5ab8bf	304	p_err("can't open fdinfo: %s", strerror(errno));
71bb428f JK	305	return NULL;
	306	}
	307
53909030	308	while ((n = getline(&line, &line_n, fdi)) > 0) {
71bb428f JK	309	char *value;
	310	int len;
	311
	312	if (!strstr(line, key))
	313	continue;
	314
	315	fclose(fdi);
	316
	317	value = strchr(line, '\t');
	318	if (!value \|\| !value[1]) {
9a5ab8bf	319	p_err("malformed fdinfo!?");
71bb428f JK	320	free(line);
	321	return NULL;
	322	}
	323	value++;
	324
	325	len = strlen(value);
	326	memmove(line, value, len);
	327	line[len - 1] = '\0';
	328
	329	return line;
	330	}
	331
9a5ab8bf	332	p_err("key '%s' not found in fdinfo", key);
71bb428f JK	333	free(line);
	334	fclose(fdi);
	335	return NULL;
	336	}
f05e2c32	337
f412eed9 JK	338	void print_data_json(uint8_t *data, size_t len)
	339	{
	340	unsigned int i;
	341
	342	jsonw_start_array(json_wtr);
	343	for (i = 0; i < len; i++)
	344	jsonw_printf(json_wtr, "%d", data[i]);
	345	jsonw_end_array(json_wtr);
	346	}
	347
f05e2c32 QM	348	void print_hex_data_json(uint8_t *data, size_t len)
	349	{
	350	unsigned int i;
	351
	352	jsonw_start_array(json_wtr);
	353	for (i = 0; i < len; i++)
	354	jsonw_printf(json_wtr, "\"0x%02hhx\"", data[i]);
	355	jsonw_end_array(json_wtr);
	356	}
4990f1f4 PB	357
	358	int build_pinned_obj_table(struct pinned_obj_table *tab,
	359	enum bpf_obj_type type)
	360	{
	361	struct bpf_prog_info pinned_info = {};
	362	struct pinned_obj *obj_node = NULL;
	363	__u32 len = sizeof(pinned_info);
	364	struct mntent *mntent = NULL;
	365	enum bpf_obj_type objtype;
	366	FILE *mntfile = NULL;
	367	FTSENT *ftse = NULL;
	368	FTS *fts = NULL;
	369	int fd, err;
	370
	371	mntfile = setmntent("/proc/mounts", "r");
	372	if (!mntfile)
	373	return -1;
	374
	375	while ((mntent = getmntent(mntfile))) {
	376	char *path[] = { mntent->mnt_dir, NULL };
	377
	378	if (strncmp(mntent->mnt_type, "bpf", 3) != 0)
	379	continue;
	380
	381	fts = fts_open(path, 0, NULL);
	382	if (!fts)
	383	continue;
	384
	385	while ((ftse = fts_read(fts))) {
	386	if (!(ftse->fts_info & FTS_F))
	387	continue;
f120919f	388	fd = open_obj_pinned(ftse->fts_path, true);
4990f1f4 PB	389	if (fd < 0)
	390	continue;
	391
	392	objtype = get_fd_type(fd);
	393	if (objtype != type) {
	394	close(fd);
	395	continue;
	396	}
	397	memset(&pinned_info, 0, sizeof(pinned_info));
	398	err = bpf_obj_get_info_by_fd(fd, &pinned_info, &len);
	399	if (err) {
	400	close(fd);
	401	continue;
	402	}
	403
	404	obj_node = malloc(sizeof(*obj_node));
	405	if (!obj_node) {
	406	close(fd);
	407	fts_close(fts);
	408	fclose(mntfile);
	409	return -1;
	410	}
	411
	412	memset(obj_node, 0, sizeof(*obj_node));
	413	obj_node->id = pinned_info.id;
	414	obj_node->path = strdup(ftse->fts_path);
	415	hash_add(tab->table, &obj_node->hash, obj_node->id);
	416
	417	close(fd);
	418	}
	419	fts_close(fts);
	420	}
	421	fclose(mntfile);
	422	return 0;
	423	}
	424
	425	void delete_pinned_obj_table(struct pinned_obj_table *tab)
	426	{
	427	struct pinned_obj *obj;
	428	struct hlist_node *tmp;
	429	unsigned int bkt;
	430
	431	hash_for_each_safe(tab->table, bkt, tmp, obj, hash) {
	432	hash_del(&obj->hash);
	433	free(obj->path);
	434	free(obj);
	435	}
	436	}
52262210	437
f412eed9 JK	438	unsigned int get_page_size(void)
	439	{
	440	static int result;
	441
	442	if (!result)
	443	result = getpagesize();
	444	return result;
	445	}
	446
e64d5256 JK	447	unsigned int get_possible_cpus(void)
	448	{
	449	static unsigned int result;
	450	char buf[128];
	451	long int n;
	452	char *ptr;
	453	int fd;
	454
	455	if (result)
	456	return result;
	457
	458	fd = open("/sys/devices/system/cpu/possible", O_RDONLY);
	459	if (fd < 0) {
	460	p_err("can't open sysfs possible cpus");
	461	exit(-1);
	462	}
	463
	464	n = read(fd, buf, sizeof(buf));
	465	if (n < 2) {
	466	p_err("can't read sysfs possible cpus");
	467	exit(-1);
	468	}
	469	close(fd);
	470
	471	if (n == sizeof(buf)) {
	472	p_err("read sysfs possible cpus overflow");
	473	exit(-1);
	474	}
	475
	476	ptr = buf;
	477	n = 0;
	478	while (ptr && ptr != '\n') {
	479	unsigned int a, b;
	480
	481	if (sscanf(ptr, "%u-%u", &a, &b) == 2) {
	482	n += b - a + 1;
	483
	484	ptr = strchr(ptr, '-') + 1;
	485	} else if (sscanf(ptr, "%u", &a) == 1) {
	486	n++;
	487	} else {
	488	assert(0);
	489	}
	490
	491	while (isdigit(*ptr))
	492	ptr++;
	493	if (*ptr == ',')
	494	ptr++;
	495	}
	496
	497	result = n;
	498
	499	return result;
	500	}
	501
52262210 JK	502	static char *
	503	ifindex_to_name_ns(__u32 ifindex, __u32 ns_dev, __u32 ns_ino, char *buf)
	504	{
	505	struct stat st;
	506	int err;
	507
	508	err = stat("/proc/self/ns/net", &st);
	509	if (err) {
	510	p_err("Can't stat /proc/self: %s", strerror(errno));
	511	return NULL;
	512	}
	513
	514	if (st.st_dev != ns_dev \|\| st.st_ino != ns_ino)
	515	return NULL;
	516
	517	return if_indextoname(ifindex, buf);
	518	}
	519
e6593596 JW	520	static int read_sysfs_hex_int(char *path)
	521	{
	522	char vendor_id_buf[8];
	523	int len;
	524	int fd;
	525
	526	fd = open(path, O_RDONLY);
	527	if (fd < 0) {
	528	p_err("Can't open %s: %s", path, strerror(errno));
	529	return -1;
	530	}
	531
	532	len = read(fd, vendor_id_buf, sizeof(vendor_id_buf));
	533	close(fd);
	534	if (len < 0) {
	535	p_err("Can't read %s: %s", path, strerror(errno));
	536	return -1;
	537	}
	538	if (len >= (int)sizeof(vendor_id_buf)) {
	539	p_err("Value in %s too long", path);
	540	return -1;
	541	}
	542
	543	vendor_id_buf[len] = 0;
	544
	545	return strtol(vendor_id_buf, NULL, 0);
	546	}
	547
	548	static int read_sysfs_netdev_hex_int(char devname, const char entry_name)
	549	{
	550	char full_path[64];
	551
	552	snprintf(full_path, sizeof(full_path), "/sys/class/net/%s/device/%s",
	553	devname, entry_name);
	554
	555	return read_sysfs_hex_int(full_path);
	556	}
	557
3ddeac67 JK	558	const char *
	559	ifindex_to_bfd_params(__u32 ifindex, __u64 ns_dev, __u64 ns_ino,
	560	const char **opt)
e6593596 JW	561	{
	562	char devname[IF_NAMESIZE];
	563	int vendor_id;
	564	int device_id;
	565
	566	if (!ifindex_to_name_ns(ifindex, ns_dev, ns_ino, devname)) {
	567	p_err("Can't get net device name for ifindex %d: %s", ifindex,
	568	strerror(errno));
	569	return NULL;
	570	}
	571
	572	vendor_id = read_sysfs_netdev_hex_int(devname, "vendor");
	573	if (vendor_id < 0) {
	574	p_err("Can't get device vendor id for %s", devname);
	575	return NULL;
	576	}
	577
	578	switch (vendor_id) {
	579	case 0x19ee:
	580	device_id = read_sysfs_netdev_hex_int(devname, "device");
	581	if (device_id != 0x4000 &&
	582	device_id != 0x6000 &&
	583	device_id != 0x6003)
	584	p_info("Unknown NFP device ID, assuming it is NFP-6xxx arch");
3ddeac67	585	*opt = "ctx4";
e6593596 JW	586	return "NFP-6xxx";
	587	default:
	588	p_err("Can't get bfd arch name for device vendor id 0x%04x",
	589	vendor_id);
	590	return NULL;
	591	}
	592	}
	593
52262210 JK	594	void print_dev_plain(__u32 ifindex, __u64 ns_dev, __u64 ns_inode)
	595	{
	596	char name[IF_NAMESIZE];
	597
	598	if (!ifindex)
	599	return;
	600
	601	printf(" dev ");
	602	if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name))
	603	printf("%s", name);
	604	else
	605	printf("ifindex %u ns_dev %llu ns_ino %llu",
	606	ifindex, ns_dev, ns_inode);
	607	}
	608
	609	void print_dev_json(__u32 ifindex, __u64 ns_dev, __u64 ns_inode)
	610	{
	611	char name[IF_NAMESIZE];
	612
	613	if (!ifindex)
	614	return;
	615
	616	jsonw_name(json_wtr, "dev");
	617	jsonw_start_object(json_wtr);
	618	jsonw_uint_field(json_wtr, "ifindex", ifindex);
	619	jsonw_uint_field(json_wtr, "ns_dev", ns_dev);
	620	jsonw_uint_field(json_wtr, "ns_inode", ns_inode);
	621	if (ifindex_to_name_ns(ifindex, ns_dev, ns_inode, name))
	622	jsonw_string_field(json_wtr, "ifname", name);
	623	jsonw_end_object(json_wtr);
	624	}
0b592b5a JK	625
	626	int parse_u32_arg(int argc, char *argv, __u32 val, const char *what)
	627	{
	628	char *endptr;
	629
	630	NEXT_ARGP();
	631
	632	if (*val) {
	633	p_err("%s already specified", what);
	634	return -1;
	635	}
	636
	637	val = strtoul(*argv, &endptr, 0);
	638	if (*endptr) {
	639	p_err("can't parse %s as %s", **argv, what);
	640	return -1;
	641	}
	642	NEXT_ARGP();
	643
	644	return 0;
	645	}