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-rw-r--r--net/sctp/bind_addr.c21
-rw-r--r--net/sctp/protocol.c11
-rw-r--r--net/sctp/sysctl.c12
3 files changed, 38 insertions, 6 deletions
diff --git a/net/sctp/bind_addr.c b/net/sctp/bind_addr.c
index 6d5944a745d..13a6fba4107 100644
--- a/net/sctp/bind_addr.c
+++ b/net/sctp/bind_addr.c
@@ -510,9 +510,28 @@ int sctp_in_scope(const union sctp_addr *addr, sctp_scope_t scope)
* of requested destination address, sender and receiver
* SHOULD include all of its addresses with level greater
* than or equal to L.
+ *
+ * Address scoping can be selectively controlled via sysctl
+ * option
*/
- if (addr_scope <= scope)
+ switch (sctp_scope_policy) {
+ case SCTP_SCOPE_POLICY_DISABLE:
return 1;
+ case SCTP_SCOPE_POLICY_ENABLE:
+ if (addr_scope <= scope)
+ return 1;
+ break;
+ case SCTP_SCOPE_POLICY_PRIVATE:
+ if (addr_scope <= scope || SCTP_SCOPE_PRIVATE == addr_scope)
+ return 1;
+ break;
+ case SCTP_SCOPE_POLICY_LINK:
+ if (addr_scope <= scope || SCTP_SCOPE_LINK == addr_scope)
+ return 1;
+ break;
+ default:
+ break;
+ }
return 0;
}
diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c
index a76da657244..60093be8385 100644
--- a/net/sctp/protocol.c
+++ b/net/sctp/protocol.c
@@ -431,16 +431,14 @@ static int sctp_v4_available(union sctp_addr *addr, struct sctp_sock *sp)
* of requested destination address, sender and receiver
* SHOULD include all of its addresses with level greater
* than or equal to L.
+ *
+ * IPv4 scoping can be controlled through sysctl option
+ * net.sctp.addr_scope_policy
*/
static sctp_scope_t sctp_v4_scope(union sctp_addr *addr)
{
sctp_scope_t retval;
- /* Should IPv4 scoping be a sysctl configurable option
- * so users can turn it off (default on) for certain
- * unconventional networking environments?
- */
-
/* Check for unusable SCTP addresses. */
if (IS_IPV4_UNUSABLE_ADDRESS(addr->v4.sin_addr.s_addr)) {
retval = SCTP_SCOPE_UNUSABLE;
@@ -1259,6 +1257,9 @@ SCTP_STATIC __init int sctp_init(void)
/* Disable AUTH by default. */
sctp_auth_enable = 0;
+ /* Set SCOPE policy to enabled */
+ sctp_scope_policy = SCTP_SCOPE_POLICY_ENABLE;
+
sctp_sysctl_register();
INIT_LIST_HEAD(&sctp_address_families);
diff --git a/net/sctp/sysctl.c b/net/sctp/sysctl.c
index 63eabbc7129..ab7151da120 100644
--- a/net/sctp/sysctl.c
+++ b/net/sctp/sysctl.c
@@ -51,6 +51,7 @@ static int timer_max = 86400000; /* ms in one day */
static int int_max = INT_MAX;
static int sack_timer_min = 1;
static int sack_timer_max = 500;
+static int addr_scope_max = 3; /* check sctp_scope_policy_t in include/net/sctp/constants.h for max entries */
extern int sysctl_sctp_mem[3];
extern int sysctl_sctp_rmem[3];
@@ -272,6 +273,17 @@ static ctl_table sctp_table[] = {
.proc_handler = proc_dointvec,
.strategy = sysctl_intvec
},
+ {
+ .ctl_name = CTL_UNNUMBERED,
+ .procname = "addr_scope_policy",
+ .data = &sctp_scope_policy,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_minmax,
+ .strategy = &sysctl_intvec,
+ .extra1 = &zero,
+ .extra2 = &addr_scope_max,
+ },
{ .ctl_name = 0 }
};