Have mac802154 header_ops.create fail with -EMSGSIZE if the length
passed will be too large to fit a frame. Since 6lowpan will ensure that
no packet payload will be too large, pass a length of 0 there. 802.15.4
dgram sockets will also return -EMSGSIZE on payloads larger than the
device MTU instead of -EINVAL.
Signed-off-by: Phoebe Buckheister <phoebe.buckheis...@itwm.fraunhofer.de>
---
net/ieee802154/6lowpan_rtnl.c | 2 +-
net/ieee802154/dgram.c | 2 +-
net/mac802154/wpan.c | 3 +++
3 files changed, 5 insertions(+), 2 deletions(-)
diff --git a/net/ieee802154/6lowpan_rtnl.c b/net/ieee802154/6lowpan_rtnl.c
index 26d4c4c..a7bc65d 100644
--- a/net/ieee802154/6lowpan_rtnl.c
+++ b/net/ieee802154/6lowpan_rtnl.c
@@ -141,7 +141,7 @@ static int lowpan_header_create(struct sk_buff *skb,
}
return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev,
- type, (void *)&da, (void *)&sa, skb->len);
+ type, (void *)&da, (void *)&sa, 0);
}
static int lowpan_give_skb_to_devices(struct sk_buff *skb,
diff --git a/net/ieee802154/dgram.c b/net/ieee802154/dgram.c
index 55f2dc4..4c47154 100644
--- a/net/ieee802154/dgram.c
+++ b/net/ieee802154/dgram.c
@@ -233,7 +233,7 @@ static int dgram_sendmsg(struct kiocb *iocb, struct sock
*sk,
if (size > mtu) {
pr_debug("size = %Zu, mtu = %u\n", size, mtu);
- err = -EINVAL;
+ err = -EMSGSIZE;
goto out_dev;
}
diff --git a/net/mac802154/wpan.c b/net/mac802154/wpan.c
index b614266..80cbee1 100644
--- a/net/mac802154/wpan.c
+++ b/net/mac802154/wpan.c
@@ -150,6 +150,9 @@ static int mac802154_header_create(struct sk_buff *skb,
skb_reset_mac_header(skb);
skb->mac_len = hlen;
+ if (hlen + len + 2 > dev->mtu)
+ return -EMSGSIZE;
+
return hlen;
}
--
1.7.9.5
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