ieee802154/dgram: Pass source address in dgram_recvmsg

This patch lets dgram_recvmsg fill in the sockaddr struct in
msg->msg_name with the source address of the packet.
This is used by the userland functions recvmsg and recvfrom to get the
senders address.

[Stefan: Changed from old zigbee legacy tree to mainline]

Signed-off-by: Stephen Röttger <stephen.roettger@zero-entropy.de>
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 10 insertions, 0 deletions

diff --git a/net/ieee802154/dgram.c b/net/ieee802154/dgram.c
index e0da175f8e5b..581a59504bd5 100644
--- a/net/ieee802154/dgram.c
+++ b/net/ieee802154/dgram.c
@@ -291,6 +291,9 @@ static int dgram_recvmsg(struct kiocb *iocb, struct sock *sk,
         size_t copied = 0;
         int err = -EOPNOTSUPP;
         struct sk_buff *skb;
+        struct sockaddr_ieee802154 *saddr;
+
+        saddr = (struct sockaddr_ieee802154 *)msg->msg_name;
 
         skb = skb_recv_datagram(sk, flags, noblock, &err);
         if (!skb)
@@ -309,6 +312,13 @@ static int dgram_recvmsg(struct kiocb *iocb, struct sock *sk,
 
         sock_recv_ts_and_drops(msg, sk, skb);
 
+        if (saddr) {
+                saddr->family = AF_IEEE802154;
+                saddr->addr = mac_cb(skb)->sa;
+        }
+        if (addr_len)
+                *addr_len = sizeof(*saddr);
+
         if (flags & MSG_TRUNC)
                 copied = skb->len;
 done: