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libbpf: Use pr_warn() when printing netlink errors

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The netlink functions were using fprintf(stderr, ) directly to print out
error messages, instead of going through the usual logging macros. This
makes it impossible for the calling application to silence or redirect
those error messages. Fix this by switching to pr_warn() in nlattr.c and
netlink.c.

Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: David S. Miller <davem@davemloft.net>
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/157333185055.88376.15999360127117901443.stgit@toke.dk
This commit is contained in:
Toke Høiland-Jørgensen 2019-11-09 21:37:30 +01:00 committed by Alexei Starovoitov
parent 4f33ddb4e3
commit b6e99b010e
2 changed files with 7 additions and 6 deletions
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3
tools/lib/bpf/netlink.c
View File

@ -12,6 +12,7 @@
#include "bpf.h"
#include "libbpf.h"
#include "libbpf_internal.h"
#include "nlattr.h"
#ifndef SOL_NETLINK
@ -43,7 +44,7 @@ int libbpf_netlink_open(__u32 *nl_pid)
if (setsockopt(sock, SOL_NETLINK, NETLINK_EXT_ACK,
&one, sizeof(one)) < 0) {
fprintf(stderr, "Netlink error reporting not supported\n");
pr_warn("Netlink error reporting not supported\n");
}
if (bind(sock, (struct sockaddr *)&sa, sizeof(sa)) < 0) {

10
tools/lib/bpf/nlattr.c
View File

@ -8,6 +8,7 @@
#include <errno.h>
#include "nlattr.h"
#include "libbpf_internal.h"
#include <linux/rtnetlink.h>
#include <string.h>
#include <stdio.h>
@ -121,8 +122,8 @@ int libbpf_nla_parse(struct nlattr *tb[], int maxtype, struct nlattr *head,
}
if (tb[type])
fprintf(stderr, "Attribute of type %#x found multiple times in message, "
"previous attribute is being ignored.\n", type);
pr_warn("Attribute of type %#x found multiple times in message, "
"previous attribute is being ignored.\n", type);
tb[type] = nla;
}
@ -181,15 +182,14 @@ int libbpf_nla_dump_errormsg(struct nlmsghdr *nlh)
if (libbpf_nla_parse(tb, NLMSGERR_ATTR_MAX, attr, alen,
extack_policy) != 0) {
fprintf(stderr,
"Failed to parse extended error attributes\n");
pr_warn("Failed to parse extended error attributes\n");
return 0;
}
if (tb[NLMSGERR_ATTR_MSG])
errmsg = (char *) libbpf_nla_data(tb[NLMSGERR_ATTR_MSG]);
fprintf(stderr, "Kernel error message: %s\n", errmsg);
pr_warn("Kernel error message: %s\n", errmsg);
return 0;
}