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nl80211: Implement netlink extended ACK support

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Implement netlink extended ACK support to print out the error
message (if any).

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2018-10-11 15:55:49 +02:00 committed by Jouni Malinen
parent c481e1cbb7
commit 40432e6eb3
1 changed files with 56 additions and 1 deletions
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57
src/drivers/driver_nl80211.c
View file

@ -40,6 +40,29 @@
#include "driver_nl80211.h"
/* support for extack if compilation headers are too old */
#ifndef NETLINK_EXT_ACK
#define NETLINK_EXT_ACK 11
enum nlmsgerr_attrs {
NLMSGERR_ATTR_UNUSED,
NLMSGERR_ATTR_MSG,
NLMSGERR_ATTR_OFFS,
NLMSGERR_ATTR_COOKIE,
__NLMSGERR_ATTR_MAX,
NLMSGERR_ATTR_MAX = __NLMSGERR_ATTR_MAX - 1
};
#endif
#ifndef NLM_F_CAPPED
#define NLM_F_CAPPED 0x100
#endif
#ifndef NLM_F_ACK_TLVS
#define NLM_F_ACK_TLVS 0x200
#endif
#ifndef SOL_NETLINK
#define SOL_NETLINK 270
#endif
#ifndef CONFIG_LIBNL20
/*
* libnl 1.1 has a bug, it tries to allocate socket numbers densely
@ -302,8 +325,35 @@ static int finish_handler(struct nl_msg *msg, void *arg)
static int error_handler(struct sockaddr_nl *nla, struct nlmsgerr *err,
void *arg)
{
struct nlmsghdr *nlh = (struct nlmsghdr *) err - 1;
int len = nlh->nlmsg_len;
struct nlattr *attrs;
struct nlattr *tb[NLMSGERR_ATTR_MAX + 1];
int *ret = arg;
int ack_len = sizeof(*nlh) + sizeof(int) + sizeof(*nlh);
*ret = err->error;
if (!(nlh->nlmsg_flags & NLM_F_ACK_TLVS))
return NL_SKIP;
if (!(nlh->nlmsg_flags & NLM_F_CAPPED))
ack_len += err->msg.nlmsg_len - sizeof(*nlh);
if (len <= ack_len)
return NL_STOP;
attrs = (void *) ((unsigned char *) nlh + ack_len);
len -= ack_len;
nla_parse(tb, NLMSGERR_ATTR_MAX, attrs, len, NULL);
if (tb[NLMSGERR_ATTR_MSG]) {
len = strnlen((char *) nla_data(tb[NLMSGERR_ATTR_MSG]),
nla_len(tb[NLMSGERR_ATTR_MSG]));
wpa_printf(MSG_ERROR, "nl80211: kernel reports: %*s",
len, (char *) nla_data(tb[NLMSGERR_ATTR_MSG]));
}
return NL_SKIP;
}
@ -342,7 +392,7 @@ static int send_and_recv(struct nl80211_global *global,
void *valid_data)
{
struct nl_cb *cb;
int err = -ENOMEM;
int err = -ENOMEM, opt;
if (!msg)
return -ENOMEM;
@ -351,6 +401,11 @@ static int send_and_recv(struct nl80211_global *global,
if (!cb)
goto out;
/* try to set NETLINK_EXT_ACK to 1, ignoring errors */
opt = 1;
setsockopt(nl_socket_get_fd(nl_handle), SOL_NETLINK,
NETLINK_EXT_ACK, &opt, sizeof(opt));
err = nl_send_auto_complete(nl_handle, msg);
if (err < 0)
goto out;