mirror of
https://github.com/openvswitch/ovs
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96b82f6d5f
Upstream commit:
commit b2d0f5d5dc53532e6f07bc546a476a55ebdfe0f3
Author: Yi Yang <yi.y.yang@intel.com>
Date: Tue Nov 7 21:07:02 2017 +0800
openvswitch: enable NSH support
OVS master and 2.8 branch has merged NSH userspace
patch series, this patch is to enable NSH support
in kernel data path in order that OVS can support
NSH in compat mode by porting this.
Signed-off-by: Yi Yang <yi.y.yang@intel.com>
Acked-by: Jiri Benc <jbenc@redhat.com>
Acked-by: Eric Garver <e@erig.me>
Acked-by: Pravin Shelar <pshelar@ovn.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Yi Yang <yi.y.yang@intel.com>
Signed-off-by: Ben Pfaff <blp@ovn.org>
Reviewed-by: Greg Rose <gvrose8192@gmail.com>
143 lines
3.0 KiB
C
143 lines
3.0 KiB
C
/*
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* Network Service Header
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*
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* Copyright (c) 2017 Red Hat, Inc. -- Jiri Benc <jbenc@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <net/nsh.h>
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#include <net/tun_proto.h>
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int ovs_nsh_push(struct sk_buff *skb, const struct nshhdr *pushed_nh)
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{
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struct nshhdr *nh;
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size_t length = nsh_hdr_len(pushed_nh);
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u8 next_proto;
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if (skb->mac_len) {
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next_proto = TUN_P_ETHERNET;
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} else {
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next_proto = tun_p_from_eth_p(skb->protocol);
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if (!next_proto)
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return -EAFNOSUPPORT;
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}
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/* Add the NSH header */
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if (skb_cow_head(skb, length) < 0)
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return -ENOMEM;
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skb_push(skb, length);
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nh = (struct nshhdr *)(skb->data);
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memcpy(nh, pushed_nh, length);
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nh->np = next_proto;
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skb_postpush_rcsum(skb, nh, length);
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skb->protocol = htons(ETH_P_NSH);
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skb_reset_mac_header(skb);
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skb_reset_network_header(skb);
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skb_reset_mac_len(skb);
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return 0;
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}
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EXPORT_SYMBOL_GPL(ovs_nsh_push);
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int ovs_nsh_pop(struct sk_buff *skb)
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{
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struct nshhdr *nh;
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size_t length;
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__be16 inner_proto;
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if (!pskb_may_pull(skb, NSH_BASE_HDR_LEN))
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return -ENOMEM;
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nh = (struct nshhdr *)(skb->data);
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length = nsh_hdr_len(nh);
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inner_proto = tun_p_to_eth_p(nh->np);
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if (!pskb_may_pull(skb, length))
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return -ENOMEM;
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if (!inner_proto)
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return -EAFNOSUPPORT;
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skb_pull_rcsum(skb, length);
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skb_reset_mac_header(skb);
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skb_reset_network_header(skb);
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skb_reset_mac_len(skb);
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skb->protocol = inner_proto;
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return 0;
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}
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EXPORT_SYMBOL_GPL(ovs_nsh_pop);
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static struct sk_buff *nsh_gso_segment(struct sk_buff *skb,
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netdev_features_t features)
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{
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struct sk_buff *segs = ERR_PTR(-EINVAL);
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unsigned int nsh_len, mac_len;
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__be16 proto;
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int nhoff;
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skb_reset_network_header(skb);
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nhoff = skb->network_header - skb->mac_header;
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mac_len = skb->mac_len;
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if (unlikely(!pskb_may_pull(skb, NSH_BASE_HDR_LEN)))
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goto out;
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nsh_len = nsh_hdr_len(nsh_hdr(skb));
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if (unlikely(!pskb_may_pull(skb, nsh_len)))
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goto out;
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proto = tun_p_to_eth_p(nsh_hdr(skb)->np);
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if (!proto)
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goto out;
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__skb_pull(skb, nsh_len);
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skb_reset_mac_header(skb);
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skb_reset_mac_len(skb);
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skb->protocol = proto;
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features &= NETIF_F_SG;
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segs = skb_mac_gso_segment(skb, features);
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if (IS_ERR_OR_NULL(segs)) {
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skb_gso_error_unwind(skb, htons(ETH_P_NSH), nsh_len,
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skb->network_header - nhoff,
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mac_len);
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goto out;
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}
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for (skb = segs; skb; skb = skb->next) {
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skb->protocol = htons(ETH_P_NSH);
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__skb_push(skb, nsh_len);
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skb_set_mac_header(skb, -nhoff);
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skb->network_header = skb->mac_header + mac_len;
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skb->mac_len = mac_len;
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}
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out:
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return segs;
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}
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static struct packet_offload nsh_packet_offload __read_mostly = {
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.type = htons(ETH_P_NSH),
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.callbacks = {
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.gso_segment = nsh_gso_segment,
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},
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};
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int ovs_nsh_init(void)
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{
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dev_add_offload(&nsh_packet_offload);
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return 0;
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}
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void ovs_nsh_cleanup(void)
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{
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dev_remove_offload(&nsh_packet_offload);
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}
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