Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / netfilter / nf_nat_proto_sctp.c

diff --git a/kernel/net/netfilter/nf_nat_proto_sctp.c b/kernel/net/netfilter/nf_nat_proto_sctp.c
new file mode 100644 (file)
index 0000000..cbc7ade
--- /dev/null
+++ b/kernel/net/netfilter/nf_nat_proto_sctp.c
@@ -0,0 +1,96 @@
+/*
+ * Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/sctp.h>
+#include <linux/module.h>
+#include <net/sctp/checksum.h>
+
+#include <net/netfilter/nf_nat_l4proto.h>
+
+static u_int16_t nf_sctp_port_rover;
+
+static void
+sctp_unique_tuple(const struct nf_nat_l3proto *l3proto,
+                 struct nf_conntrack_tuple *tuple,
+                 const struct nf_nat_range *range,
+                 enum nf_nat_manip_type maniptype,
+                 const struct nf_conn *ct)
+{
+       nf_nat_l4proto_unique_tuple(l3proto, tuple, range, maniptype, ct,
+                                   &nf_sctp_port_rover);
+}
+
+static bool
+sctp_manip_pkt(struct sk_buff *skb,
+              const struct nf_nat_l3proto *l3proto,
+              unsigned int iphdroff, unsigned int hdroff,
+              const struct nf_conntrack_tuple *tuple,
+              enum nf_nat_manip_type maniptype)
+{
+       sctp_sctphdr_t *hdr;
+
+       if (!skb_make_writable(skb, hdroff + sizeof(*hdr)))
+               return false;
+
+       hdr = (struct sctphdr *)(skb->data + hdroff);
+
+       if (maniptype == NF_NAT_MANIP_SRC) {
+               /* Get rid of src port */
+               hdr->source = tuple->src.u.sctp.port;
+       } else {
+               /* Get rid of dst port */
+               hdr->dest = tuple->dst.u.sctp.port;
+       }
+
+       hdr->checksum = sctp_compute_cksum(skb, hdroff);
+
+       return true;
+}
+
+static const struct nf_nat_l4proto nf_nat_l4proto_sctp = {
+       .l4proto                = IPPROTO_SCTP,
+       .manip_pkt              = sctp_manip_pkt,
+       .in_range               = nf_nat_l4proto_in_range,
+       .unique_tuple           = sctp_unique_tuple,
+#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
+       .nlattr_to_range        = nf_nat_l4proto_nlattr_to_range,
+#endif
+};
+
+static int __init nf_nat_proto_sctp_init(void)
+{
+       int err;
+
+       err = nf_nat_l4proto_register(NFPROTO_IPV4, &nf_nat_l4proto_sctp);
+       if (err < 0)
+               goto err1;
+       err = nf_nat_l4proto_register(NFPROTO_IPV6, &nf_nat_l4proto_sctp);
+       if (err < 0)
+               goto err2;
+       return 0;
+
+err2:
+       nf_nat_l4proto_unregister(NFPROTO_IPV4, &nf_nat_l4proto_sctp);
+err1:
+       return err;
+}
+
+static void __exit nf_nat_proto_sctp_exit(void)
+{
+       nf_nat_l4proto_unregister(NFPROTO_IPV6, &nf_nat_l4proto_sctp);
+       nf_nat_l4proto_unregister(NFPROTO_IPV4, &nf_nat_l4proto_sctp);
+}
+
+module_init(nf_nat_proto_sctp_init);
+module_exit(nf_nat_proto_sctp_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("SCTP NAT protocol helper");
+MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");