tools: bpftool: try to mount bpffs if required for pinning objects
One possible cause of failure for `bpftool {prog|map} pin * file FILE` is the FILE not being in an eBPF virtual file system (bpffs). In this case, make bpftool attempt to mount bpffs on the parent directory of the FILE. Then, if this operation is successful, try again to pin the object. The code for mnt_bpffs() is a copy of function bpf_mnt_fs() from iproute2 package (under lib/bpf.c, taken at commit 4b73d52f8a81), with modifications regarding handling of error messages. Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com> Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -42,6 +42,7 @@
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#include <unistd.h>
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#include <linux/limits.h>
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#include <linux/magic.h>
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#include <sys/mount.h>
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#include <sys/types.h>
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#include <sys/vfs.h>
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@ -59,6 +60,37 @@ static bool is_bpffs(char *path)
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return (unsigned long)st_fs.f_type == BPF_FS_MAGIC;
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}
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static int mnt_bpffs(const char *target, char *buff, size_t bufflen)
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{
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bool bind_done = false;
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while (mount("", target, "none", MS_PRIVATE | MS_REC, NULL)) {
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if (errno != EINVAL || bind_done) {
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snprintf(buff, bufflen,
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"mount --make-private %s failed: %s",
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target, strerror(errno));
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return -1;
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}
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if (mount(target, target, "none", MS_BIND, NULL)) {
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snprintf(buff, bufflen,
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"mount --bind %s %s failed: %s",
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target, target, strerror(errno));
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return -1;
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}
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bind_done = true;
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}
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if (mount("bpf", target, "bpf", 0, "mode=0700")) {
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snprintf(buff, bufflen, "mount -t bpf bpf %s failed: %s",
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target, strerror(errno));
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return -1;
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}
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return 0;
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}
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int open_obj_pinned_any(char *path, enum bpf_obj_type exp_type)
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{
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enum bpf_obj_type type;
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@ -89,8 +121,11 @@ int open_obj_pinned_any(char *path, enum bpf_obj_type exp_type)
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int do_pin_any(int argc, char **argv, int (*get_fd_by_id)(__u32))
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{
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char err_str[ERR_MAX_LEN];
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unsigned int id;
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char *endptr;
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char *file;
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char *dir;
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int err;
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int fd;
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@ -117,16 +152,36 @@ int do_pin_any(int argc, char **argv, int (*get_fd_by_id)(__u32))
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}
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err = bpf_obj_pin(fd, *argv);
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close(fd);
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if (err) {
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p_err("can't pin the object (%s): %s", *argv,
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errno == EACCES && !is_bpffs(dirname(*argv)) ?
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"directory not in bpf file system (bpffs)" :
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strerror(errno));
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return -1;
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if (!err)
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goto out_close;
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file = malloc(strlen(*argv) + 1);
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strcpy(file, *argv);
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dir = dirname(file);
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if (errno != EPERM || is_bpffs(dir)) {
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p_err("can't pin the object (%s): %s", *argv, strerror(errno));
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goto out_free;
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}
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return 0;
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/* Attempt to mount bpffs, then retry pinning. */
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err = mnt_bpffs(dir, err_str, ERR_MAX_LEN);
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if (!err) {
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err = bpf_obj_pin(fd, *argv);
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if (err)
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p_err("can't pin the object (%s): %s", *argv,
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strerror(errno));
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} else {
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err_str[ERR_MAX_LEN - 1] = '\0';
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p_err("can't mount BPF file system to pin the object (%s): %s",
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*argv, err_str);
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}
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out_free:
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free(file);
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out_close:
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close(fd);
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return err;
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}
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const char *get_fd_type_name(enum bpf_obj_type type)
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@ -51,6 +51,8 @@
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#define NEXT_ARGP() ({ (*argc)--; (*argv)++; if (*argc < 0) usage(); })
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#define BAD_ARG() ({ p_err("what is '%s'?\n", *argv); -1; })
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#define ERR_MAX_LEN 1024
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#define BPF_TAG_FMT "%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx"
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#define HELP_SPEC_PROGRAM \
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