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| author |   Alexander Aring <alex.aring@gmail.com> | 2015-10-13 13:42:56 +0200 |
|---|---|---|
| committer |   Marcel Holtmann <marcel@holtmann.org> | 2015-10-21 00:49:24 +0200 |
| commit | bf513fd6fc609590b7835c0dba624ccb9f8f9214 (patch) | |
| tree | d67d1ce786f536b031346e84e1217e59a4ae9b4e | |
| parent | bluetooth: 6lowpan: use lowpan dispatch helpers (diff) | |
| download | linux-dev-bf513fd6fc609590b7835c0dba624ccb9f8f9214.tar.xz linux-dev-bf513fd6fc609590b7835c0dba624ccb9f8f9214.zip | |
6lowpan: introduce LOWPAN_IPHC_MAX_HC_BUF_LEN
This patch introduces the LOWPAN_IPHC_MAX_HC_BUF_LEN define which
represent the worst-case supported IPHC buffer length. It's used to
allocate the stack buffer space for creating the IPHC header.
Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Acked-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
| -rw-r--r-- | include/net/6lowpan.h | 8 | ||||
| -rw-r--r-- | net/6lowpan/iphc.c | 2 |
2 files changed, 9 insertions, 1 deletions
diff --git a/include/net/6lowpan.h b/include/net/6lowpan.h index 07db532696df..aa5a82380e4e 100644 --- a/include/net/6lowpan.h +++ b/include/net/6lowpan.h @@ -64,12 +64,20 @@ #define EUI64_ADDR_LEN 8 #define LOWPAN_NHC_MAX_ID_LEN 1 +/* Maximum next header compression length which we currently support inclusive + * possible inline data. + */ +#define LOWPAN_NHC_MAX_HDR_LEN (sizeof(struct udphdr)) /* Max IPHC Header len without IPv6 hdr specific inline data. * Useful for getting the "extra" bytes we need at worst case compression. * * LOWPAN_IPHC + CID + LOWPAN_NHC_MAX_ID_LEN */ #define LOWPAN_IPHC_MAX_HEADER_LEN (2 + 1 + LOWPAN_NHC_MAX_ID_LEN) +/* Maximum worst case IPHC header buffer size */ +#define LOWPAN_IPHC_MAX_HC_BUF_LEN (sizeof(struct ipv6hdr) + \ + LOWPAN_IPHC_MAX_HEADER_LEN + \ + LOWPAN_NHC_MAX_HDR_LEN) /* * ipv6 address based on mac diff --git a/net/6lowpan/iphc.c b/net/6lowpan/iphc.c index 78c8a495b571..dd5f27d5358e 100644 --- a/net/6lowpan/iphc.c +++ b/net/6lowpan/iphc.c @@ -429,7 +429,7 @@ int lowpan_header_compress(struct sk_buff *skb, struct net_device *dev, { u8 tmp, iphc0, iphc1, *hc_ptr; struct ipv6hdr *hdr; - u8 head[100] = {}; + u8 head[LOWPAN_IPHC_MAX_HC_BUF_LEN] = {}; int ret, addr_type; if (type != ETH_P_IPV6) |