1 files changed, 59 insertions, 0 deletions

diff --git a/net/sctp/sysctl.c b/net/sctp/sysctl.c
index 70e3ba5cb50b..043889ac86c0 100644
--- a/net/sctp/sysctl.c
+++ b/net/sctp/sysctl.c
@@ -62,6 +62,11 @@ extern long sysctl_sctp_mem[3];
 extern int sysctl_sctp_rmem[3];
 extern int sysctl_sctp_wmem[3];
 
+static int proc_sctp_do_hmac_alg(ctl_table *ctl,
+                                int write,
+                                void __user *buffer, size_t *lenp,
+
+                                loff_t *ppos);
 static ctl_table sctp_table[] = {
         {
                 .procname       = "sctp_mem",
@@ -147,6 +152,12 @@ static ctl_table sctp_net_table[] = {
                 .proc_handler   = proc_dointvec,
         },
         {
+                .procname       = "cookie_hmac_alg",
+                .maxlen         = 8,
+                .mode           = 0644,
+                .proc_handler   = proc_sctp_do_hmac_alg,
+        },
+        {
                 .procname       = "valid_cookie_life",
                 .data           = &init_net.sctp.valid_cookie_life,
                 .maxlen         = sizeof(unsigned int),
@@ -289,6 +300,54 @@ static ctl_table sctp_net_table[] = {
         { /* sentinel */ }
 };
 
+static int proc_sctp_do_hmac_alg(ctl_table *ctl,
+                                int write,
+                                void __user *buffer, size_t *lenp,
+                                loff_t *ppos)
+{
+        struct net *net = current->nsproxy->net_ns;
+        char tmp[8];
+        ctl_table tbl;
+        int ret;
+        int changed = 0;
+        char *none = "none";
+
+        memset(&tbl, 0, sizeof(struct ctl_table));
+
+        if (write) {
+                tbl.data = tmp;
+                tbl.maxlen = 8;
+        } else {
+                tbl.data = net->sctp.sctp_hmac_alg ? : none;
+                tbl.maxlen = strlen(tbl.data);
+        }
+                ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
+
+        if (write) {
+#ifdef CONFIG_CRYPTO_MD5
+                if (!strncmp(tmp, "md5", 3)) {
+                        net->sctp.sctp_hmac_alg = "md5";
+                        changed = 1;
+                }
+#endif
+#ifdef CONFIG_CRYPTO_SHA1
+                if (!strncmp(tmp, "sha1", 4)) {
+                        net->sctp.sctp_hmac_alg = "sha1";
+                        changed = 1;
+                }
+#endif
+                if (!strncmp(tmp, "none", 4)) {
+                        net->sctp.sctp_hmac_alg = NULL;
+                        changed = 1;
+                }
+
+                if (!changed)
+                        ret = -EINVAL;
+        }
+
+        return ret;
+}
+
 int sctp_sysctl_net_register(struct net *net)
 {
         struct ctl_table *table;