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SubjectRe: [PATCH] ieee802154: add rx LQI from userspace
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Hello.

On 06/07/2018 04:08 PM, Clément Péron wrote:
> From: Romuald CARI <romuald.cari@devialet.com>
>
> The Link Quality Indication data exposed by drivers could not be accessed from
> userspace. Since this data is per-datagram received, it makes sense to make it
> available to userspace application through the ancillary data mechanism in
> recvmsg rather than through ioctls. This can be activated using the socket
> option WPAN_WANTLQI under SOL_IEEE802154 protocol.
>
> This LQI data is available in the ancillary data buffer under the SOL_IEEE802154
> level as the type WPAN_LQI. The value is an unsigned byte indicating the link
> quality with values ranging 0-255.
>
> Signed-off-by: Romuald Cari <romuald.cari@devialet.com>
> Signed-off-by: Clément Peron <clement.peron@devialet.com>
> ---
> include/net/af_ieee802154.h | 1 +
> net/ieee802154/socket.c | 17 +++++++++++++++++
> 2 files changed, 18 insertions(+)
>
> diff --git a/include/net/af_ieee802154.h b/include/net/af_ieee802154.h
> index a5563d27a3eb..8003a9f6eb43 100644
> --- a/include/net/af_ieee802154.h
> +++ b/include/net/af_ieee802154.h
> @@ -56,6 +56,7 @@ struct sockaddr_ieee802154 {
> #define WPAN_WANTACK 0
> #define WPAN_SECURITY 1
> #define WPAN_SECURITY_LEVEL 2
> +#define WPAN_WANTLQI 3
>
> #define WPAN_SECURITY_DEFAULT 0
> #define WPAN_SECURITY_OFF 1
> diff --git a/net/ieee802154/socket.c b/net/ieee802154/socket.c
> index a60658c85a9a..bc6b912603f1 100644
> --- a/net/ieee802154/socket.c
> +++ b/net/ieee802154/socket.c
> @@ -25,6 +25,7 @@
> #include <linux/termios.h> /* For TIOCOUTQ/INQ */
> #include <linux/list.h>
> #include <linux/slab.h>
> +#include <linux/socket.h>
> #include <net/datalink.h>
> #include <net/psnap.h>
> #include <net/sock.h>
> @@ -452,6 +453,7 @@ struct dgram_sock {
> unsigned int bound:1;
> unsigned int connected:1;
> unsigned int want_ack:1;
> + unsigned int want_lqi:1;
> unsigned int secen:1;
> unsigned int secen_override:1;
> unsigned int seclevel:3;
> @@ -486,6 +488,7 @@ static int dgram_init(struct sock *sk)
> struct dgram_sock *ro = dgram_sk(sk);
>
> ro->want_ack = 1;
> + ro->want_lqi = 0;
> return 0;
> }
>
> @@ -713,6 +716,7 @@ static int dgram_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
> size_t copied = 0;
> int err = -EOPNOTSUPP;
> struct sk_buff *skb;
> + struct dgram_sock *ro = dgram_sk(sk);
> DECLARE_SOCKADDR(struct sockaddr_ieee802154 *, saddr, msg->msg_name);
>
> skb = skb_recv_datagram(sk, flags, noblock, &err);
> @@ -744,6 +748,13 @@ static int dgram_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
> *addr_len = sizeof(*saddr);
> }
>
> + if (ro->want_lqi) {
> + err = put_cmsg(msg, SOL_IEEE802154, WPAN_WANTLQI,
> + sizeof(uint8_t), &(mac_cb(skb)->lqi));
> + if (err)
> + goto done;
> + }
> +
> if (flags & MSG_TRUNC)
> copied = skb->len;
> done:
> @@ -847,6 +858,9 @@ static int dgram_getsockopt(struct sock *sk, int level, int optname,
> case WPAN_WANTACK:
> val = ro->want_ack;
> break;
> + case WPAN_WANTLQI:
> + val = ro->want_lqi;
> + break;
> case WPAN_SECURITY:
> if (!ro->secen_override)
> val = WPAN_SECURITY_DEFAULT;
> @@ -892,6 +906,9 @@ static int dgram_setsockopt(struct sock *sk, int level, int optname,
> case WPAN_WANTACK:
> ro->want_ack = !!val;
> break;
> + case WPAN_WANTLQI:
> + ro->want_lqi = !!val;
> + break;
> case WPAN_SECURITY:
> if (!ns_capable(net->user_ns, CAP_NET_ADMIN) &&
> !ns_capable(net->user_ns, CAP_NET_RAW)) {
>

This patch has been applied to the wpan-next tree and will be
part of the next pull request to net-next. Thanks!

regards
Stefan Schmidt

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