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tools: bpftool: report device information for offloaded programs

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Print the just-exposed device information about device to which
program is bound.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Jakub Kicinski
2017-12-27 18:39:10 -08:00
committed by Daniel Borkmann
parent 675fc275a3
commit 522622104e
3 changed files with 57 additions and 0 deletions
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52
tools/bpf/bpftool/common.c
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@@ -44,7 +44,9 @@
#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>
@@ -412,3 +414,53 @@ void delete_pinned_obj_table(struct pinned_obj_table *tab)
free(obj);
}
}
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);
}
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);
}