[SCTP]: Implement SCTP-AUTH internals

This patch implements the internals operations of the AUTH, such as
key computation and storage.  It also adds necessary variables to
the SCTP data structures.

Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 66 insertions, 5 deletions

diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index b4812a2d3bb0..18b06afacea0 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -64,6 +64,7 @@
 #include <linux/skbuff.h>       /* We need sk_buff_head. */
 #include <linux/workqueue.h>    /* We need tq_struct.    */
 #include <linux/sctp.h>         /* We need sctp* header structs.  */
+#include <net/sctp/auth.h>      /* We need auth specific structs */
 
 /* A convenience structure for handling sockaddr structures.
  * We should wean ourselves off this.
@@ -216,6 +217,9 @@ extern struct sctp_globals {
 
         /* Flag to indicate if PR-SCTP is enabled. */
         int prsctp_enable;
+
+        /* Flag to idicate if SCTP-AUTH is enabled */
+        int auth_enable;
 } sctp_globals;
 
 #define sctp_rto_initial                (sctp_globals.rto_initial)
@@ -248,6 +252,7 @@ extern struct sctp_globals {
 #define sctp_local_addr_lock            (sctp_globals.addr_list_lock)
 #define sctp_addip_enable               (sctp_globals.addip_enable)
 #define sctp_prsctp_enable              (sctp_globals.prsctp_enable)
+#define sctp_auth_enable                (sctp_globals.auth_enable)
 
 /* SCTP Socket type: UDP or TCP style. */
 typedef enum {
@@ -397,6 +402,9 @@ struct sctp_cookie {
 
         __u32 adaptation_ind;
 
+        __u8 auth_random[sizeof(sctp_paramhdr_t) + SCTP_AUTH_RANDOM_LENGTH];
+        __u8 auth_hmacs[SCTP_AUTH_NUM_HMACS + 2];
+        __u8 auth_chunks[sizeof(sctp_paramhdr_t) + SCTP_AUTH_MAX_CHUNKS];
 
         /* This is a shim for my peer's INIT packet, followed by
          * a copy of the raw address list of the association.
@@ -441,6 +449,9 @@ union sctp_params {
         union sctp_addr_param *addr;
         struct sctp_adaptation_ind_param *aind;
         struct sctp_supported_ext_param *ext;
+        struct sctp_random_param *random;
+        struct sctp_chunks_param *chunks;
+        struct sctp_hmac_algo_param *hmac_algo;
 };
 
 /* RFC 2960.  Section 3.3.5 Heartbeat.
@@ -679,6 +690,7 @@ struct sctp_chunk {
                 struct sctp_errhdr *err_hdr;
                 struct sctp_addiphdr *addip_hdr;
                 struct sctp_fwdtsn_hdr *fwdtsn_hdr;
+                struct sctp_authhdr *auth_hdr;
         } subh;
 
         __u8 *chunk_end;
@@ -724,6 +736,7 @@ struct sctp_chunk {
         __s8 fast_retransmit;    /* Is this chunk fast retransmitted? */
         __u8 tsn_missing_report; /* Data chunk missing counter. */
         __u8 data_accepted;     /* At least 1 chunk in this packet accepted */
+        __u8 auth;              /* IN: was auth'ed | OUT: needs auth */
 };
 
 void sctp_chunk_hold(struct sctp_chunk *);
@@ -773,16 +786,22 @@ struct sctp_packet {
          */
         struct sctp_transport *transport;
 
+        /* pointer to the auth chunk for this packet */
+        struct sctp_chunk *auth;
+
         /* This packet contains a COOKIE-ECHO chunk. */
-        char has_cookie_echo;
+        __u8 has_cookie_echo;
+
+        /* This packet contains a SACK chunk. */
+        __u8 has_sack;
 
-        /* This packet containsa SACK chunk. */
-        char has_sack;
+        /* This packet contains an AUTH chunk */
+        __u8 has_auth;
 
         /* SCTP cannot fragment this packet. So let ip fragment it. */
-        char ipfragok;
+        __u8 ipfragok;
 
-        int malloced;
+        __u8 malloced;
 };
 
 struct sctp_packet *sctp_packet_init(struct sctp_packet *,
@@ -1291,6 +1310,21 @@ struct sctp_endpoint {
 
         /* rcvbuf acct. policy. */
         __u32 rcvbuf_policy;
+
+        /* SCTP AUTH: array of the HMACs that will be allocated
+         * we need this per association so that we don't serialize
+         */
+        struct crypto_hash **auth_hmacs;
+
+        /* SCTP-AUTH: hmacs for the endpoint encoded into parameter */
+         struct sctp_hmac_algo_param *auth_hmacs_list;
+
+        /* SCTP-AUTH: chunks to authenticate encoded into parameter */
+        struct sctp_chunks_param *auth_chunk_list;
+
+        /* SCTP-AUTH: endpoint shared keys */
+        struct list_head endpoint_shared_keys;
+        __u16 active_key_id;
 };
 
 /* Recover the outter endpoint structure. */
@@ -1497,6 +1531,7 @@ struct sctp_association {
                 __u8    hostname_address;/* Peer understands DNS addresses? */
                 __u8    asconf_capable;  /* Does peer support ADDIP? */
                 __u8    prsctp_capable;  /* Can peer do PR-SCTP? */
+                __u8    auth_capable;    /* Is peer doing SCTP-AUTH? */
 
                 __u32   adaptation_ind;  /* Adaptation Code point. */
 
@@ -1514,6 +1549,14 @@ struct sctp_association {
                  * Initial TSN Value minus 1
                  */
                 __u32 addip_serial;
+
+                /* SCTP-AUTH: We need to know pears random number, hmac list
+                 * and authenticated chunk list.  All that is part of the
+                 * cookie and these are just pointers to those locations
+                 */
+                sctp_random_param_t *peer_random;
+                sctp_chunks_param_t *peer_chunks;
+                sctp_hmac_algo_param_t *peer_hmacs;
         } peer;
 
         /* State       : A state variable indicating what state the
@@ -1797,6 +1840,24 @@ struct sctp_association {
          */
         __u32 addip_serial;
 
+        /* SCTP AUTH: list of the endpoint shared keys.  These
+         * keys are provided out of band by the user applicaton
+         * and can't change during the lifetime of the association
+         */
+        struct list_head endpoint_shared_keys;
+
+        /* SCTP AUTH:
+         * The current generated assocaition shared key (secret)
+         */
+        struct sctp_auth_bytes *asoc_shared_key;
+
+        /* SCTP AUTH: hmac id of the first peer requested algorithm
+         * that we support.
+         */
+        __u16 default_hmac_id;
+
+        __u16 active_key_id;
+
         /* Need to send an ECNE Chunk? */
         char need_ecne;