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authorXin Long <lucien.xin@gmail.com>2019-08-19 22:02:48 +0800
committerDavid S. Miller <davem@davemloft.net>2019-08-19 18:27:29 -0700
commit03f961270f4256fe9f47b94aea889bd26877216b (patch)
tree17cafda52c0aeebd645503c8227379d8a92b2120 /net/sctp/auth.c
parent219f9ea4d3b797f0337dece61e4e8255840e47d0 (diff)
sctp: add sctp_auth_init and sctp_auth_free
This patch is to factor out sctp_auth_init and sctp_auth_free functions, and sctp_auth_init will also be used in the next patch for SCTP_AUTH_SUPPORTED sockopt. Signed-off-by: Xin Long <lucien.xin@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sctp/auth.c')
-rw-r--r--net/sctp/auth.c69
1 files changed, 69 insertions, 0 deletions
diff --git a/net/sctp/auth.c b/net/sctp/auth.c
index 61b00904d830..4278764d82b8 100644
--- a/net/sctp/auth.c
+++ b/net/sctp/auth.c
@@ -1007,3 +1007,72 @@ int sctp_auth_deact_key_id(struct sctp_endpoint *ep,
return 0;
}
+
+int sctp_auth_init(struct sctp_endpoint *ep, gfp_t gfp)
+{
+ int err = -ENOMEM;
+
+ /* 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.
+ */
+ if (!ep->auth_hmacs_list) {
+ struct sctp_hmac_algo_param *auth_hmacs;
+
+ auth_hmacs = kzalloc(struct_size(auth_hmacs, hmac_ids,
+ SCTP_AUTH_NUM_HMACS), gfp);
+ if (!auth_hmacs)
+ 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(struct sctp_paramhdr) + 2);
+ auth_hmacs->hmac_ids[0] = htons(SCTP_AUTH_HMAC_ID_SHA1);
+ ep->auth_hmacs_list = auth_hmacs;
+ }
+
+ if (!ep->auth_chunk_list) {
+ struct sctp_chunks_param *auth_chunks;
+
+ auth_chunks = kzalloc(sizeof(*auth_chunks) +
+ SCTP_NUM_CHUNK_TYPES, gfp);
+ if (!auth_chunks)
+ goto nomem;
+ /* Initialize the CHUNKS parameter */
+ auth_chunks->param_hdr.type = SCTP_PARAM_CHUNKS;
+ auth_chunks->param_hdr.length =
+ htons(sizeof(struct sctp_paramhdr));
+ ep->auth_chunk_list = auth_chunks;
+ }
+
+ /* Allocate and initialize transorms arrays for supported
+ * HMACs.
+ */
+ err = sctp_auth_init_hmacs(ep, gfp);
+ if (err)
+ goto nomem;
+
+ return 0;
+
+nomem:
+ /* Free all allocations */
+ kfree(ep->auth_hmacs_list);
+ kfree(ep->auth_chunk_list);
+ ep->auth_hmacs_list = NULL;
+ ep->auth_chunk_list = NULL;
+ return err;
+}
+
+void sctp_auth_free(struct sctp_endpoint *ep)
+{
+ kfree(ep->auth_hmacs_list);
+ kfree(ep->auth_chunk_list);
+ ep->auth_hmacs_list = NULL;
+ ep->auth_chunk_list = NULL;
+ sctp_auth_destroy_hmacs(ep->auth_hmacs);
+ ep->auth_hmacs = NULL;
+}