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authorVlad Yasevich <vladislav.yasevich@hp.com>2006-01-17 11:52:12 -0800
committerSridhar Samudrala <sri@us.ibm.com>2006-01-17 11:52:12 -0800
commit9834a2bb4970547540222fcba04e0a37d04cb0a0 (patch)
treed86a2a4de740c815cead2748952035b1216269ef
parent7a48f923b8b27bfaa5f7b2a449a6fe268724ddd5 (diff)
[SCTP]: Fix sctp_cookie alignment in the packet.
On 64 bit architectures, sctp_cookie sent as part of INIT-ACK is not aligned on a 64 bit boundry and thus causes unaligned access exceptions. The layout of the cookie prameter is this: |<----- Parameter Header --------------------|<--- Cookie DATA -------- ----------------------------------------------------------------------- | param type (16 bits) | param len (16 bits) | sig [32 bytes] | cookie.. ----------------------------------------------------------------------- The cookie data portion contains 64 bit values on 64 bit architechtures (timeval) that fall on a 32 bit alignment boundry when used as part of the on-wire format, but align correctly when used in internal structures. This patch explicitely pads the on-wire format so that it is properly aligned. Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com> Signed-off-by: Sridhar Samudrala <sri@us.ibm.com>
-rw-r--r--include/net/sctp/structs.h3
-rw-r--r--net/sctp/sm_make_chunk.c14
2 files changed, 14 insertions, 3 deletions
diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index f5c22d77fea..72aeae4a006 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -405,8 +405,9 @@ struct sctp_cookie {
/* The format of our cookie that we send to our peer. */
struct sctp_signed_cookie {
__u8 signature[SCTP_SECRET_SIZE];
+ __u32 __pad; /* force sctp_cookie alignment to 64 bits */
struct sctp_cookie c;
-};
+} __attribute__((packed));
/* This is another convenience type to allocate memory for address
* params for the maximum size and pass such structures around
diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index 556c495c692..4fe1d6c863b 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -1275,7 +1275,12 @@ static sctp_cookie_param_t *sctp_pack_cookie(const struct sctp_endpoint *ep,
unsigned int keylen;
char *key;
- headersize = sizeof(sctp_paramhdr_t) + SCTP_SECRET_SIZE;
+ /* Header size is static data prior to the actual cookie, including
+ * any padding.
+ */
+ headersize = sizeof(sctp_paramhdr_t) +
+ (sizeof(struct sctp_signed_cookie) -
+ sizeof(struct sctp_cookie));
bodysize = sizeof(struct sctp_cookie)
+ ntohs(init_chunk->chunk_hdr->length) + addrs_len;
@@ -1362,7 +1367,12 @@ struct sctp_association *sctp_unpack_cookie(
struct sk_buff *skb = chunk->skb;
struct timeval tv;
- headersize = sizeof(sctp_chunkhdr_t) + SCTP_SECRET_SIZE;
+ /* Header size is static data prior to the actual cookie, including
+ * any padding.
+ */
+ headersize = sizeof(sctp_chunkhdr_t) +
+ (sizeof(struct sctp_signed_cookie) -
+ sizeof(struct sctp_cookie));
bodysize = ntohs(chunk->chunk_hdr->length) - headersize;
fixed_size = headersize + sizeof(struct sctp_cookie);