diff options
| author | Alexander Aring <alex.aring@gmail.com> | 2015-10-01 08:03:06 +0200 |
|---|---|---|
| committer | Marcel Holtmann <marcel@holtmann.org> | 2015-10-01 13:38:22 +0200 |
| commit | 5f509239eccc9d118d3474a22e78b3da1ceefe02 (patch) | |
| tree | c844c9e2538af12aec5911c6705818d7cac76028 | |
| parent | e98d6d6203552ebd1e80ac17de857547efa37fba (diff) | |
| download | linux-5f509239eccc9d118d3474a22e78b3da1ceefe02.tar.bz2 | |
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 <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
| -rw-r--r-- | net/ieee802154/6lowpan/6lowpan_i.h | 4 | ||||
| -rw-r--r-- | net/ieee802154/6lowpan/reassembly.c | 2 | ||||
| -rw-r--r-- | net/ieee802154/6lowpan/tx.c | 10 |
3 files changed, 9 insertions, 7 deletions
diff --git a/net/ieee802154/6lowpan/6lowpan_i.h b/net/ieee802154/6lowpan/6lowpan_i.h index 10d44d08a440..b4e17a7c0df0 100644 --- a/net/ieee802154/6lowpan/6lowpan_i.h +++ b/net/ieee802154/6lowpan/6lowpan_i.h @@ -18,7 +18,7 @@ typedef unsigned __bitwise__ lowpan_rx_result; struct lowpan_create_arg { u16 tag; - unsigned int d_size; + u16 d_size; const struct ieee802154_addr *src; const struct ieee802154_addr *dst; }; @@ -29,7 +29,7 @@ struct lowpan_frag_queue { struct inet_frag_queue q; u16 tag; - unsigned int d_size; + u16 d_size; struct ieee802154_addr saddr; struct ieee802154_addr daddr; }; diff --git a/net/ieee802154/6lowpan/reassembly.c b/net/ieee802154/6lowpan/reassembly.c index af663cb74f1f..12e8cf4bda9f 100644 --- a/net/ieee802154/6lowpan/reassembly.c +++ b/net/ieee802154/6lowpan/reassembly.c @@ -37,7 +37,7 @@ static struct inet_frags lowpan_frags; static int lowpan_frag_reasm(struct lowpan_frag_queue *fq, struct sk_buff *prev, struct net_device *ldev); -static unsigned int lowpan_hash_frag(u16 tag, unsigned int d_size, +static unsigned int lowpan_hash_frag(u16 tag, u16 d_size, const struct ieee802154_addr *saddr, const struct ieee802154_addr *daddr) { 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 */ |