/*
* Initialize the base fields of the endpoint structure.
*/
static struct sctp_endpoint *sctp_endpoint_init(struct sctp_endpoint *ep,
struct sock *sk,
gfp_t gfp)
{
struct net *net = sock_net(sk);
struct sctp_hmac_algo_param *auth_hmacs = NULL;
struct sctp_chunks_param *auth_chunks = NULL;
struct sctp_shared_key *null_key;
int err;
ep->digest = kzalloc(SCTP_SIGNATURE_SIZE, gfp);
if (!ep->digest)
return NULL;
if (net->sctp.auth_enable) {
/* Allocate space for HMACS and CHUNKS authentication
* variables. There are arrays that we encode directly
* into parameters to make the rest of the operations easier.
*/
auth_hmacs = kzalloc(sizeof(sctp_hmac_algo_param_t) +
sizeof(__u16) * SCTP_AUTH_NUM_HMACS, gfp);
if (!auth_hmacs)
goto nomem;
auth_chunks = kzalloc(sizeof(sctp_chunks_param_t) +
SCTP_NUM_CHUNK_TYPES, gfp);
if (!auth_chunks)
goto nomem;
/* Initialize the HMACS parameter.
* SCTP-AUTH: Section 3.3
* Every endpoint supporting SCTP chunk authentication MUST
* support the HMAC based on the SHA-1 algorithm.
*/
auth_hmacs->param_hdr.type = SCTP_PARAM_HMAC_ALGO;
auth_hmacs->param_hdr.length =
htons(sizeof(sctp_paramhdr_t) + 2);
auth_hmacs->hmac_ids[0] = htons(SCTP_AUTH_HMAC_ID_SHA1);
/* Initialize the CHUNKS parameter */
auth_chunks->param_hdr.type = SCTP_PARAM_CHUNKS;
auth_chunks->param_hdr.length = htons(sizeof(sctp_paramhdr_t));
/* If the Add-IP functionality is enabled, we must
* authenticate, ASCONF and ASCONF-ACK chunks
*/
if (net->sctp.addip_enable) {
auth_chunks->chunks[0] = SCTP_CID_ASCONF;
auth_chunks->chunks[1] = SCTP_CID_ASCONF_ACK;
auth_chunks->param_hdr.length =
htons(sizeof(sctp_paramhdr_t) + 2);
}
}
/* Initialize the base structure. */
/* What type of endpoint are we? */
ep->base.type = SCTP_EP_TYPE_SOCKET;
/* Initialize the basic object fields. */
atomic_set(&ep->base.refcnt, 1);
ep->base.dead = 0;
ep->base.malloced = 1;
/* Create an input queue. */
sctp_inq_init(&ep->base.inqueue);
/* Set its top-half handler */
sctp_inq_set_th_handler(&ep->base.inqueue, sctp_endpoint_bh_rcv);
/* Initialize the bind addr area */
sctp_bind_addr_init(&ep->base.bind_addr, 0);
/* Remember who we are attached to. */
ep->base.sk = sk;
sock_hold(ep->base.sk);
/* Create the lists of associations. */
INIT_LIST_HEAD(&ep->asocs);
/* Use SCTP specific send buffer space queues. */
ep->sndbuf_policy = net->sctp.sndbuf_policy;
sk->sk_data_ready = sctp_data_ready;
sk->sk_write_space = sctp_write_space;
sock_set_flag(sk, SOCK_USE_WRITE_QUEUE);
/* Get the receive buffer policy for this endpoint */
ep->rcvbuf_policy = net->sctp.rcvbuf_policy;
/* Initialize the secret key used with cookie. */
get_random_bytes(ep->secret_key, sizeof(ep->secret_key));
/* SCTP-AUTH extensions*/
INIT_LIST_HEAD(&ep->endpoint_shared_keys);
null_key = sctp_auth_shkey_create(0, GFP_KERNEL);
if (!null_key)
goto nomem;
list_add(&null_key->key_list, &ep->endpoint_shared_keys);
/* Allocate and initialize transorms arrays for supported HMACs. */
err = sctp_auth_init_hmacs(ep, gfp);
if (err)
goto nomem_hmacs;
/* Add the null key to the endpoint shared keys list and
* set the hmcas and chunks pointers.
*/
ep->auth_hmacs_list = auth_hmacs;
ep->auth_chunk_list = auth_chunks;
return ep;
nomem_hmacs:
sctp_auth_destroy_keys(&ep->endpoint_shared_keys);
nomem:
/* Free all allocations */
kfree(auth_hmacs);
kfree(auth_chunks);
kfree(ep->digest);
return NULL;
}
static struct sctp_endpoint *sctp_endpoint_init(struct sctp_endpoint *ep,
struct sock *sk,
gfp_t gfp)
{
struct sctp_hmac_algo_param *auth_hmacs = NULL;
struct sctp_chunks_param *auth_chunks = NULL;
struct sctp_shared_key *null_key;
int err;
ep->digest = kzalloc(SCTP_SIGNATURE_SIZE, gfp);
if (!ep->digest)
return NULL;
if (sctp_auth_enable) {
/*
*/
auth_hmacs = kzalloc(sizeof(sctp_hmac_algo_param_t) +
sizeof(__u16) * SCTP_AUTH_NUM_HMACS, gfp);
if (!auth_hmacs)
goto nomem;
auth_chunks = kzalloc(sizeof(sctp_chunks_param_t) +
SCTP_NUM_CHUNK_TYPES, gfp);
if (!auth_chunks)
goto nomem;
/*
*/
auth_hmacs->param_hdr.type = SCTP_PARAM_HMAC_ALGO;
auth_hmacs->param_hdr.length =
htons(sizeof(sctp_paramhdr_t) + 2);
auth_hmacs->hmac_ids[0] = htons(SCTP_AUTH_HMAC_ID_SHA1);
/* */
auth_chunks->param_hdr.type = SCTP_PARAM_CHUNKS;
auth_chunks->param_hdr.length = htons(sizeof(sctp_paramhdr_t));
/*
*/
if (sctp_addip_enable) {
auth_chunks->chunks[0] = SCTP_CID_ASCONF;
auth_chunks->chunks[1] = SCTP_CID_ASCONF_ACK;
auth_chunks->param_hdr.length =
htons(sizeof(sctp_paramhdr_t) + 2);
}
}
/* */
/* */
ep->base.type = SCTP_EP_TYPE_SOCKET;
/* */
atomic_set(&ep->base.refcnt, 1);
ep->base.dead = 0;
ep->base.malloced = 1;
/* */
sctp_inq_init(&ep->base.inqueue);
/* */
sctp_inq_set_th_handler(&ep->base.inqueue, sctp_endpoint_bh_rcv);
/* */
sctp_bind_addr_init(&ep->base.bind_addr, 0);
/* */
ep->base.sk = sk;
sock_hold(ep->base.sk);
/* */
INIT_LIST_HEAD(&ep->asocs);
/* */
ep->sndbuf_policy = sctp_sndbuf_policy;
sk->sk_data_ready = sctp_data_ready;
sk->sk_write_space = sctp_write_space;
sock_set_flag(sk, SOCK_USE_WRITE_QUEUE);
/* */
ep->rcvbuf_policy = sctp_rcvbuf_policy;
/* */
get_random_bytes(&ep->secret_key[0], SCTP_SECRET_SIZE);
ep->last_key = ep->current_key = 0;
ep->key_changed_at = jiffies;
/* */
INIT_LIST_HEAD(&ep->endpoint_shared_keys);
null_key = sctp_auth_shkey_create(0, GFP_KERNEL);
if (!null_key)
goto nomem;
list_add(&null_key->key_list, &ep->endpoint_shared_keys);
/* */
err = sctp_auth_init_hmacs(ep, gfp);
if (err)
goto nomem_hmacs;
/*
*/
ep->auth_hmacs_list = auth_hmacs;
ep->auth_chunk_list = auth_chunks;
return ep;
nomem_hmacs:
sctp_auth_destroy_keys(&ep->endpoint_shared_keys);
nomem:
/* */
kfree(auth_hmacs);
kfree(auth_chunks);
kfree(ep->digest);
return NULL;
}