*/
#include <linux/types.h>
-#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/in.h>
#include <linux/random.h> /* get_random_bytes() */
#include <net/sctp/sm.h>
/* Forward declarations for internal helpers. */
-static void sctp_endpoint_bh_rcv(struct sctp_endpoint *ep);
+static void sctp_endpoint_bh_rcv(struct work_struct *work);
/*
* Initialize the base fields of the endpoint structure.
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;
+
memset(ep, 0, sizeof(struct sctp_endpoint));
ep->digest = kzalloc(SCTP_SIGNATURE_SIZE, gfp);
if (!ep->digest)
return NULL;
+ if (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;
+
+ /* If the Add-IP functionality is enabled, we must
+ * authenticate, ASCONF and ASCONF-ACK chunks
+ */
+ 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);
+ }
+ }
+
/* Initialize the base structure. */
/* What type of endpoint are we? */
ep->base.type = SCTP_EP_TYPE_SOCKET;
sctp_inq_init(&ep->base.inqueue);
/* Set its top-half handler */
- sctp_inq_set_th_handler(&ep->base.inqueue,
- (void (*)(void *))sctp_endpoint_bh_rcv, ep);
+ 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);
- rwlock_init(&ep->base.addr_lock);
/* Remember who we are attached to. */
ep->base.sk = sk;
/* Use SCTP specific send buffer space queues. */
ep->sndbuf_policy = sctp_sndbuf_policy;
+
sk->sk_write_space = sctp_write_space;
sock_set_flag(sk, SOCK_USE_WRITE_QUEUE);
ep->last_key = ep->current_key = 0;
ep->key_changed_at = jiffies;
+ /* 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 suported 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;
+
}
/* Create a sctp_endpoint with all that boring stuff initialized.
/* Free the digest buffer */
kfree(ep->digest);
+ /* SCTP-AUTH: Free up AUTH releated data such as shared keys
+ * chunks and hmacs arrays that were allocated
+ */
+ sctp_auth_destroy_keys(&ep->endpoint_shared_keys);
+ kfree(ep->auth_hmacs_list);
+ kfree(ep->auth_chunk_list);
+
+ /* AUTH - Free any allocated HMAC transform containers */
+ sctp_auth_destroy_hmacs(ep->auth_hmacs);
+
/* Cleanup. */
sctp_inq_free(&ep->base.inqueue);
sctp_bind_addr_free(&ep->base.bind_addr);
struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *ep,
const union sctp_addr *laddr)
{
- struct sctp_endpoint *retval;
+ struct sctp_endpoint *retval = NULL;
- sctp_read_lock(&ep->base.addr_lock);
if (htons(ep->base.bind_addr.port) == laddr->v4.sin_port) {
if (sctp_bind_addr_match(&ep->base.bind_addr, laddr,
- sctp_sk(ep->base.sk))) {
+ sctp_sk(ep->base.sk)))
retval = ep;
- goto out;
- }
}
- retval = NULL;
-
-out:
- sctp_read_unlock(&ep->base.addr_lock);
return retval;
}
list_for_each(pos, &ep->asocs) {
asoc = list_entry(pos, struct sctp_association, asocs);
if (rport == asoc->peer.port) {
- sctp_read_lock(&asoc->base.addr_lock);
*transport = sctp_assoc_lookup_paddr(asoc, paddr);
- sctp_read_unlock(&asoc->base.addr_lock);
if (*transport)
return asoc;
int sctp_endpoint_is_peeled_off(struct sctp_endpoint *ep,
const union sctp_addr *paddr)
{
- struct list_head *pos;
struct sctp_sockaddr_entry *addr;
struct sctp_bind_addr *bp;
- sctp_read_lock(&ep->base.addr_lock);
bp = &ep->base.bind_addr;
- list_for_each(pos, &bp->address_list) {
- addr = list_entry(pos, struct sctp_sockaddr_entry, list);
- if (sctp_has_association(&addr->a, paddr)) {
- sctp_read_unlock(&ep->base.addr_lock);
+ /* This function is called with the socket lock held,
+ * so the address_list can not change.
+ */
+ list_for_each_entry(addr, &bp->address_list, list) {
+ if (sctp_has_association(&addr->a, paddr))
return 1;
- }
}
- sctp_read_unlock(&ep->base.addr_lock);
return 0;
}
/* Do delayed input processing. This is scheduled by sctp_rcv().
* This may be called on BH or task time.
*/
-static void sctp_endpoint_bh_rcv(struct sctp_endpoint *ep)
+static void sctp_endpoint_bh_rcv(struct work_struct *work)
{
+ struct sctp_endpoint *ep =
+ container_of(work, struct sctp_endpoint,
+ base.inqueue.immediate);
struct sctp_association *asoc;
struct sock *sk;
struct sctp_transport *transport;
sctp_subtype_t subtype;
sctp_state_t state;
int error = 0;
+ int first_time = 1; /* is this the first time through the looop */
if (ep->base.dead)
return;
while (NULL != (chunk = sctp_inq_pop(inqueue))) {
subtype = SCTP_ST_CHUNK(chunk->chunk_hdr->type);
+ /* If the first chunk in the packet is AUTH, do special
+ * processing specified in Section 6.3 of SCTP-AUTH spec
+ */
+ if (first_time && (subtype.chunk == SCTP_CID_AUTH)) {
+ struct sctp_chunkhdr *next_hdr;
+
+ next_hdr = sctp_inq_peek(inqueue);
+ if (!next_hdr)
+ goto normal;
+
+ /* If the next chunk is COOKIE-ECHO, skip the AUTH
+ * chunk while saving a pointer to it so we can do
+ * Authentication later (during cookie-echo
+ * processing).
+ */
+ if (next_hdr->type == SCTP_CID_COOKIE_ECHO) {
+ chunk->auth_chunk = skb_clone(chunk->skb,
+ GFP_ATOMIC);
+ chunk->auth = 1;
+ continue;
+ }
+ }
+normal:
/* We might have grown an association since last we
* looked, so try again.
*
}
state = asoc ? asoc->state : SCTP_STATE_CLOSED;
+ if (sctp_auth_recv_cid(subtype.chunk, asoc) && !chunk->auth)
+ continue;
/* Remember where the last DATA chunk came from so we
* know where to send the SACK.
chunk->transport->last_time_heard = jiffies;
error = sctp_do_sm(SCTP_EVENT_T_CHUNK, subtype, state,
- ep, asoc, chunk, GFP_ATOMIC);
+ ep, asoc, chunk, GFP_ATOMIC);
if (error && chunk)
chunk->pdiscard = 1;
*/
if (!sctp_sk(sk)->ep)
break;
+
+ if (first_time)
+ first_time = 0;
}
}
projects / firefly-linux-kernel-4.4.55.git / blobdiff