Hello.
On 09/05/2017 02:18 PM, Diogenes Pereira wrote:
According to 802.15.4-2003/2006/2015 specifications the MAC frame is
composed of MHR, MAC payload and MFR and just the outgoing MAC payload
must be encrypted.
If communication is secure,sender build Auxiliary Security Header(ASH),
insert it next to the standard MHR header with security enabled bit ON,
and secure frames before transmitting them. According to the information
carried within the ASH, recipient retrieves the right cryptographic key
and correctly un-secure MAC frames.
The error scenario occurs on Linux using IEEE802154_SCF_SECLEVEL_ENC(4)
security level when llsec_do_encrypt_unauth() function builds theses MAC
frames incorrectly. On recipients these MAC frames are discarded,logging
"got invalid frame" messages.
Acked-by: Stefan Schmidt <stefan@xxxxxxxxxxxxxxx>
I did not ack this patch so far. Maybe you mixed this up with the second
patch I acked.
I can see from the updated commit message that you also checked for this
behavior in the older specs. Thanks! Did you also run tests against
another LLC implementation (e.g. contiki) to see if it does not break
anything fro them?
regards
Stefan Schmidt
Signed-off-by: Diogenes Pereira <dvnp@xxxxxxxxxxxx>
---
net/mac802154/llsec.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
diff --git a/net/mac802154/llsec.c b/net/mac802154/llsec.c
index 1e1c9b2..d9e7105 100644
--- a/net/mac802154/llsec.c
+++ b/net/mac802154/llsec.c
@@ -623,13 +623,18 @@ llsec_do_encrypt_unauth(struct sk_buff *skb, const struct mac802154_llsec *sec,
u8 iv[16];
struct scatterlist src;
SKCIPHER_REQUEST_ON_STACK(req, key->tfm0);
- int err;
+ int err, datalen;
+ unsigned char *data;
llsec_geniv(iv, sec->params.hwaddr, &hdr->sec);
- sg_init_one(&src, skb->data, skb->len);
+ /* Compute data payload offset and data length */
+ data = skb_mac_header(skb) + skb->mac_len;
+ datalen = skb_tail_pointer(skb) - data;
+ sg_init_one(&src, data, datalen);
+
skcipher_request_set_tfm(req, key->tfm0);
skcipher_request_set_callback(req, 0, NULL, NULL);
- skcipher_request_set_crypt(req, &src, &src, skb->len, iv);
+ skcipher_request_set_crypt(req, &src, &src, datalen, iv);
err = crypto_skcipher_encrypt(req);
skcipher_request_zero(req);
return err;
--
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