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NFC: Reserve LLCP ssap when replying to an SNL frame 

Replying to an SNL (Service Name Lookup) means that the other end of
the link can now rely on our answer (Which is an ssap) and thus we have
to reserve it.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Samuel Ortiz 2012-10-15 14:28:13 +02:00
parent 984d334f28
commit e6904081dd
1 changed files with 41 additions and 7 deletions
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48
net/nfc/llcp/llcp.c
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@ -1071,20 +1071,54 @@ static void nfc_llcp_recv_snl(struct nfc_llcp_local *local,
service_name = (char *) &tlv[3];
service_name_len = length - 1;
pr_debug("Looking for %s\n", service_name);
pr_debug("Looking for %.16s\n", service_name);
if (service_name_len == strlen("urn:nfc:sn:sdp") &&
!strncmp(service_name, "urn:nfc:sn:sdp",
service_name_len)) {
sap = 1;
} else {
llcp_sock =
nfc_llcp_sock_from_sn(local,
service_name,
service_name_len);
sap = llcp_sock ? llcp_sock->ssap : 0;
goto send_snl;
}
llcp_sock = nfc_llcp_sock_from_sn(local, service_name,
service_name_len);
if (!llcp_sock) {
sap = 0;
goto send_snl;
}
/*
* We found a socket but its ssap has not been reserved
* yet. We need to assign it for good and send a reply.
* The ssap will be freed when the socket is closed.
*/
if (llcp_sock->ssap == LLCP_SDP_UNBOUND) {
atomic_t *client_count;
sap = nfc_llcp_reserve_sdp_ssap(local);
pr_debug("Reserving %d\n", sap);
if (sap == LLCP_SAP_MAX) {
sap = 0;
goto send_snl;
}
client_count =
&local->local_sdp_cnt[sap -
LLCP_WKS_NUM_SAP];
atomic_inc(client_count);
llcp_sock->ssap = sap;
llcp_sock->reserved_ssap = sap;
} else {
sap = llcp_sock->ssap;
}
pr_debug("%p %d\n", llcp_sock, sap);
send_snl:
nfc_llcp_send_snl(local, tid, sap);
break;