From 5f509239eccc9d118d3474a22e78b3da1ceefe02 Mon Sep 17 00:00:00 2001 From: Alexander Aring Date: Thu, 1 Oct 2015 08:03:06 +0200 Subject: ieee802154: handle datagram variables as u16 This reverts commit 9abc378c66e3d6f437eed77c1c534cbc183523f7 ("ieee802154: 6lowpan: change datagram var types"). The reason is that I forgot the IPv6 fragmentation here. Our MTU of lowpan interface is 1280 and skb->len should not above of that. If we reach a payload above 1280 in IPv6 header then we have a IPv6 fragmentation above 802.15.4 6LoWPAN fragmentation. The type "u16" was fine, instead I added now a WARN_ON_ONCE if skb->len is above MTU which should never happen otherwise IPv6 on minimum MTU size is broken. Signed-off-by: Alexander Aring Signed-off-by: Marcel Holtmann --- net/ieee802154/6lowpan/tx.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) (limited to 'net/ieee802154/6lowpan/tx.c') diff --git a/net/ieee802154/6lowpan/tx.c b/net/ieee802154/6lowpan/tx.c index 57363026ff22..62a21f6f021e 100644 --- a/net/ieee802154/6lowpan/tx.c +++ b/net/ieee802154/6lowpan/tx.c @@ -137,8 +137,8 @@ lowpan_xmit_fragment(struct sk_buff *skb, const struct ieee802154_hdr *wpan_hdr, static int lowpan_xmit_fragmented(struct sk_buff *skb, struct net_device *ldev, - const struct ieee802154_hdr *wpan_hdr, - unsigned int dgram_size, unsigned int dgram_offset) + const struct ieee802154_hdr *wpan_hdr, u16 dgram_size, + u16 dgram_offset) { __be16 frag_tag; u8 frag_hdr[5]; @@ -203,7 +203,7 @@ err: } static int lowpan_header(struct sk_buff *skb, struct net_device *ldev, - unsigned int *dgram_size, unsigned int *dgram_offset) + u16 *dgram_size, u16 *dgram_offset) { struct wpan_dev *wpan_dev = lowpan_dev_info(ldev)->wdev->ieee802154_ptr; struct ieee802154_addr sa, da; @@ -253,10 +253,12 @@ netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *ldev) { struct ieee802154_hdr wpan_hdr; int max_single, ret; - unsigned int dgram_size, dgram_offset; + u16 dgram_size, dgram_offset; pr_debug("package xmit\n"); + WARN_ON_ONCE(skb->len > IPV6_MIN_MTU); + /* We must take a copy of the skb before we modify/replace the ipv6 * header as the header could be used elsewhere */ -- cgit v1.2.3-59-g8ed1b