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| author | Alexander Aring <alex.aring@gmail.com> | 2015-10-13 14:42:56 +0300 |
|---|---|---|
| committer | Marcel Holtmann <marcel@holtmann.org> | 2015-10-21 01:49:24 +0300 |
| commit | bf513fd6fc609590b7835c0dba624ccb9f8f9214 (patch) | |
| tree | d67d1ce786f536b031346e84e1217e59a4ae9b4e /include | |
| parent | cefdb801c80736017b5a0d97a4a9f816d5a98fc4 (diff) | |
| download | linux-bf513fd6fc609590b7835c0dba624ccb9f8f9214.tar.xz | |
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>
Diffstat (limited to 'include')
| -rw-r--r-- | include/net/6lowpan.h | 8 |
1 files changed, 8 insertions, 0 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 |