nsh: add GSO support
Add a new nsh/ directory. It currently holds only GSO functions but more
will come: in particular, code shared by openvswitch and tc to manipulate
NSH headers.
For now, assume there's no hardware support for NSH segmentation. We can
always introduce netdev->nsh_features later.
Signed-off-by: Jiri Benc <jbenc@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/nsh/nsh.c b/net/nsh/nsh.c
new file mode 100644
index 0000000..58fb827
--- /dev/null
+++ b/net/nsh/nsh.c
@@ -0,0 +1,91 @@
+/*
+ * Network Service Header
+ *
+ * Copyright (c) 2017 Red Hat, Inc. -- Jiri Benc <jbenc@redhat.com>
+ *
+ * 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/module.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <net/nsh.h>
+#include <net/tun_proto.h>
+
+static struct sk_buff *nsh_gso_segment(struct sk_buff *skb,
+ netdev_features_t features)
+{
+ struct sk_buff *segs = ERR_PTR(-EINVAL);
+ unsigned int nsh_len, mac_len;
+ __be16 proto;
+ int nhoff;
+
+ skb_reset_network_header(skb);
+
+ nhoff = skb->network_header - skb->mac_header;
+ mac_len = skb->mac_len;
+
+ if (unlikely(!pskb_may_pull(skb, NSH_BASE_HDR_LEN)))
+ goto out;
+ nsh_len = nsh_hdr_len(nsh_hdr(skb));
+ if (unlikely(!pskb_may_pull(skb, nsh_len)))
+ goto out;
+
+ proto = tun_p_to_eth_p(nsh_hdr(skb)->np);
+ if (!proto)
+ goto out;
+
+ __skb_pull(skb, nsh_len);
+
+ skb_reset_mac_header(skb);
+ skb_reset_mac_len(skb);
+ skb->protocol = proto;
+
+ features &= NETIF_F_SG;
+ segs = skb_mac_gso_segment(skb, features);
+ if (IS_ERR_OR_NULL(segs)) {
+ skb_gso_error_unwind(skb, htons(ETH_P_NSH), nsh_len,
+ skb->network_header - nhoff,
+ mac_len);
+ goto out;
+ }
+
+ for (skb = segs; skb; skb = skb->next) {
+ skb->protocol = htons(ETH_P_NSH);
+ __skb_push(skb, nsh_len);
+ skb_set_mac_header(skb, -nhoff);
+ skb->network_header = skb->mac_header + mac_len;
+ skb->mac_len = mac_len;
+ }
+
+out:
+ return segs;
+}
+
+static struct packet_offload nsh_packet_offload __read_mostly = {
+ .type = htons(ETH_P_NSH),
+ .priority = 15,
+ .callbacks = {
+ .gso_segment = nsh_gso_segment,
+ },
+};
+
+static int __init nsh_init_module(void)
+{
+ dev_add_offload(&nsh_packet_offload);
+ return 0;
+}
+
+static void __exit nsh_cleanup_module(void)
+{
+ dev_remove_offload(&nsh_packet_offload);
+}
+
+module_init(nsh_init_module);
+module_exit(nsh_cleanup_module);
+
+MODULE_AUTHOR("Jiri Benc <jbenc@redhat.com>");
+MODULE_DESCRIPTION("NSH protocol");
+MODULE_LICENSE("GPL v2");