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>

1 files changed, 91 insertions, 0 deletions

diff --git a/net/nsh/nsh.c b/net/nsh/nsh.c
new file mode 100644
index 000000000000..58fb827439a8
--- /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");