sctp: enable udp tunneling socks

[linux-2.6-microblaze.git] / net / sctp / sysctl.c

diff --git a/net/sctp/sysctl.c b/net/sctp/sysctl.c
index ecc1b5e..e92df77 100644 (file)
--- a/net/sctp/sysctl.c
+++ b/net/sctp/sysctl.c
@@ -49,6 +49,8 @@ static int proc_sctp_do_rto_min(struct ctl_table *ctl, int write,
                                void *buffer, size_t *lenp, loff_t *ppos);
 static int proc_sctp_do_rto_max(struct ctl_table *ctl, int write, void *buffer,
                                size_t *lenp, loff_t *ppos);
+static int proc_sctp_do_udp_port(struct ctl_table *ctl, int write, void *buffer,
+                                size_t *lenp, loff_t *ppos);
 static int proc_sctp_do_alpha_beta(struct ctl_table *ctl, int write,
                                   void *buffer, size_t *lenp, loff_t *ppos);
 static int proc_sctp_do_auth(struct ctl_table *ctl, int write,
@@ -291,6 +293,15 @@ static struct ctl_table sctp_net_table[] = {
                .mode           = 0644,
                .proc_handler   = proc_dointvec,
        },
+       {
+               .procname       = "udp_port",
+               .data           = &init_net.sctp.udp_port,
+               .maxlen         = sizeof(int),
+               .mode           = 0644,
+               .proc_handler   = proc_sctp_do_udp_port,
+               .extra1         = SYSCTL_ZERO,
+               .extra2         = &udp_port_max,
+       },
        {
                .procname       = "encap_port",
                .data           = &init_net.sctp.encap_port,
@@ -487,6 +498,47 @@ static int proc_sctp_do_auth(struct ctl_table *ctl, int write,
        return ret;
 }
 
+static int proc_sctp_do_udp_port(struct ctl_table *ctl, int write,
+                                void *buffer, size_t *lenp, loff_t *ppos)
+{
+       struct net *net = current->nsproxy->net_ns;
+       unsigned int min = *(unsigned int *)ctl->extra1;
+       unsigned int max = *(unsigned int *)ctl->extra2;
+       struct ctl_table tbl;
+       int ret, new_value;
+
+       memset(&tbl, 0, sizeof(struct ctl_table));
+       tbl.maxlen = sizeof(unsigned int);
+
+       if (write)
+               tbl.data = &new_value;
+       else
+               tbl.data = &net->sctp.udp_port;
+
+       ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
+       if (write && ret == 0) {
+               struct sock *sk = net->sctp.ctl_sock;
+
+               if (new_value > max || new_value < min)
+                       return -EINVAL;
+
+               net->sctp.udp_port = new_value;
+               sctp_udp_sock_stop(net);
+               if (new_value) {
+                       ret = sctp_udp_sock_start(net);
+                       if (ret)
+                               net->sctp.udp_port = 0;
+               }
+
+               /* Update the value in the control socket */
+               lock_sock(sk);
+               sctp_sk(sk)->udp_port = htons(net->sctp.udp_port);
+               release_sock(sk);
+       }
+
+       return ret;
+}
+
 int sctp_sysctl_net_register(struct net *net)
 {
        struct ctl_table *table;