From 6e3e939f3b1bf8534b32ad09ff199d88800835a0 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Wed, 9 Nov 2011 10:15:42 +0100 Subject: net: add wireless TX status socket option The 802.1X EAPOL handshake hostapd does requires knowing whether the frame was ack'ed by the peer. Currently, we fudge this pretty badly by not even transmitting the frame as a normal data frame but injecting it with radiotap and getting the status out of radiotap monitor as well. This is rather complex, confuses users (mon.wlan0 presence) and doesn't work with all hardware. To get rid of that hack, introduce a real wifi TX status option for data frame transmissions. This works similar to the existing TX timestamping in that it reflects the SKB back to the socket's error queue with a SCM_WIFI_STATUS cmsg that has an int indicating ACK status (0/1). Since it is possible that at some point we will want to have TX timestamping and wifi status in a single errqueue SKB (there's little point in not doing that), redefine SO_EE_ORIGIN_TIMESTAMPING to SO_EE_ORIGIN_TXSTATUS which can collect more than just the timestamp; keep the old constant as an alias of course. Currently the internal APIs don't make that possible, but it wouldn't be hard to split them up in a way that makes it possible. Thanks to Neil Horman for helping me figure out the functions that add the control messages. Signed-off-by: Johannes Berg Signed-off-by: John W. Linville --- net/core/skbuff.c | 20 ++++++++++++++++++++ net/core/sock.c | 9 +++++++++ 2 files changed, 29 insertions(+) (limited to 'net/core') diff --git a/net/core/skbuff.c b/net/core/skbuff.c index ca4db40e75b8..2f6babd5a570 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -3168,6 +3168,26 @@ void skb_tstamp_tx(struct sk_buff *orig_skb, } EXPORT_SYMBOL_GPL(skb_tstamp_tx); +void skb_complete_wifi_ack(struct sk_buff *skb, bool acked) +{ + struct sock *sk = skb->sk; + struct sock_exterr_skb *serr; + int err; + + skb->wifi_acked_valid = 1; + skb->wifi_acked = acked; + + serr = SKB_EXT_ERR(skb); + memset(serr, 0, sizeof(*serr)); + serr->ee.ee_errno = ENOMSG; + serr->ee.ee_origin = SO_EE_ORIGIN_TXSTATUS; + + err = sock_queue_err_skb(sk, skb); + if (err) + kfree_skb(skb); +} +EXPORT_SYMBOL_GPL(skb_complete_wifi_ack); + /** * skb_partial_csum_set - set up and verify partial csum values for packet diff --git a/net/core/sock.c b/net/core/sock.c index 4ed7b1d12f5e..cbdf51c0d5ac 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -740,6 +740,11 @@ set_rcvbuf: case SO_RXQ_OVFL: sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool); break; + + case SO_WIFI_STATUS: + sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool); + break; + default: ret = -ENOPROTOOPT; break; @@ -961,6 +966,10 @@ int sock_getsockopt(struct socket *sock, int level, int optname, v.val = !!sock_flag(sk, SOCK_RXQ_OVFL); break; + case SO_WIFI_STATUS: + v.val = !!sock_flag(sk, SOCK_WIFI_STATUS); + break; + default: return -ENOPROTOOPT; } -- cgit v1.2.3