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Date: Thu, 11 Feb 2016 10:35:14 +0000
From: Brian Russell <brussell@...cade.com>
To: <netdev@...r.kernel.org>
Subject: [PATCH net-next 2/2] vxlan: support GPE/NSH
Support the Generic Protocol Extension to VxLAN which extends VxLAN to
allow multi-protocol encapsulation. IPv4, IPv6, MPLS unicast and
NSH encapsulated packets can be sent and received in addition to ethernet
frames. As defined in:
https://tools.ietf.org/html/draft-ietf-nvo3-vxlan-gpe-01
Signed-off-by: Brian Russell <brussell@...cade.com>
---
drivers/net/vxlan.c | 139 +++++++++++++++++++++++++++++++++++++++----
include/net/vxlan.h | 40 ++++++++++++-
include/uapi/linux/if_link.h | 1 +
3 files changed, 166 insertions(+), 14 deletions(-)
diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 65f5247..92a4cdc 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -50,6 +50,7 @@
#include <net/ip6_checksum.h>
#endif
#include <net/dst_metadata.h>
+#include <net/nsh.h>
#define VXLAN_VERSION "0.1"
@@ -1168,14 +1169,7 @@ static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb,
if (!vxlan)
goto drop;
- skb_reset_mac_header(skb);
skb_scrub_packet(skb, !net_eq(vxlan->net, dev_net(vxlan->dev)));
- skb->protocol = eth_type_trans(skb, vxlan->dev);
- skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
-
- /* Ignore packet loops (and multicast echo) */
- if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
- goto drop;
/* Get data from the outer IP header */
if (vxlan_get_sk_family(vs) == AF_INET) {
@@ -1195,13 +1189,57 @@ static void vxlan_rcv(struct vxlan_sock *vs, struct sk_buff *skb,
tun_dst = NULL;
}
+ switch (md->gpe_np) {
+ case VXLAN_GPE_NP_IPv4:
+ skb->protocol = htons(ETH_P_IP);
+ goto skip_l2;
+#if IS_ENABLED(CONFIG_IPV6)
+ case VXLAN_GPE_NP_IPv6:
+ skb->protocol = htons(ETH_P_IPV6);
+ goto skip_l2;
+#endif
+#if IS_ENABLED(CONFIG_MPLS)
+ case VXLAN_GPE_NP_MPLS:
+ skb->protocol = htons(ETH_P_MPLS_UC);
+ goto skip_l2;
+#endif
+#if IS_ENABLED(CONFIG_NET_NSH)
+ case VXLAN_GPE_NP_NSH:
+ {
+ u_char next_proto;
+
+ if (nsh_decap(skb, NULL, NULL, &next_proto) < 0)
+ goto drop;
+
+ if (next_proto != NSH_NEXT_PROTO_ETH)
+ goto skip_l2;
+ }
+ break;
+#endif
+ case VXLAN_GPE_NP_ETH:
+ /* GPE with next proto eth is equivalent to vanilla vxlan. */
+ default:
+ break;
+ }
+
+ skb_reset_mac_header(skb);
+ skb->protocol = eth_type_trans(skb, vxlan->dev);
+ skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
+
+ /* Ignore packet loops (and multicast echo) */
+ if (ether_addr_equal(eth_hdr(skb)->h_source, vxlan->dev->dev_addr))
+ goto drop;
+
if ((vxlan->flags & VXLAN_F_LEARN) &&
vxlan_snoop(skb->dev, &saddr, eth_hdr(skb)->h_source))
goto drop;
+skip_l2:
skb_reset_network_header(skb);
+
/* In flow-based mode, GBP is carried in dst_metadata */
- if (!(vs->flags & VXLAN_F_COLLECT_METADATA))
+ if (!(vs->flags & VXLAN_F_COLLECT_METADATA) &&
+ !(vs->flags & VXLAN_F_GPE))
skb->mark = md->gbp;
if (oip6)
@@ -1252,6 +1290,10 @@ static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
struct vxlan_metadata _md;
struct vxlan_metadata *md = &_md;
+ vs = rcu_dereference_sk_user_data(sk);
+ if (!vs)
+ goto drop;
+
/* Need Vxlan and inner Ethernet header to be present */
if (!pskb_may_pull(skb, VXLAN_HLEN))
goto error;
@@ -1267,14 +1309,13 @@ static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
goto bad_flags;
}
- if (iptunnel_pull_header(skb, VXLAN_HLEN, htons(ETH_P_TEB)))
+ /* If GPE, protocol will be set once next proto examined. */
+ if (iptunnel_pull_header(skb, VXLAN_HLEN,
+ vs->flags & VXLAN_F_GPE ?
+ htons(ETH_P_IP) : htons(ETH_P_TEB)))
goto drop;
vxh = (struct vxlanhdr *)(udp_hdr(skb) + 1);
- vs = rcu_dereference_sk_user_data(sk);
- if (!vs)
- goto drop;
-
if ((flags & VXLAN_HF_RCO) && (vs->flags & VXLAN_F_REMCSUM_RX)) {
vxh = vxlan_remcsum(skb, vxh, sizeof(struct vxlanhdr), vni,
!!(vs->flags & VXLAN_F_REMCSUM_NOPARTIAL));
@@ -1318,6 +1359,16 @@ static int vxlan_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
flags &= ~VXLAN_GBP_USED_BITS;
}
+ if (vs->flags & VXLAN_F_GPE) {
+ /* Next protocol is required */
+ if (!(flags & VXLAN_HF_GPE_NP))
+ goto bad_flags;
+
+ md->gpe_np = flags & VXLAN_GPE_NP_MASK;
+
+ flags &= ~VXLAN_GPE_USED_BITS;
+ }
+
if (flags || vni & ~VXLAN_VNI_MASK) {
/* If there are any unprocessed flags remaining treat
* this as a malformed packet. This behavior diverges from
@@ -1664,6 +1715,37 @@ static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
return false;
}
+static void vxlan_build_gpe_hdr(struct vxlanhdr *vxh, __be16 proto)
+{
+ u32 next_proto;
+
+ switch (proto) {
+#if IS_ENABLED(CONFIG_NET_NSH)
+ case htons(ETH_P_NSH):
+ next_proto = VXLAN_GPE_NP_NSH;
+ break;
+#endif
+ case htons(ETH_P_IP):
+ next_proto = VXLAN_GPE_NP_IPv4;
+ break;
+#if IS_ENABLED(CONFIG_IPV6)
+ case htons(ETH_P_IPV6):
+ next_proto = VXLAN_GPE_NP_IPv6;
+ break;
+#endif
+#if IS_ENABLED(CONFIG_MPLS)
+ case htons(ETH_P_MPLS_UC):
+ next_proto = VXLAN_GPE_NP_MPLS;
+ break;
+#endif
+ default:
+ next_proto = VXLAN_GPE_NP_ETH;
+ break;
+ }
+
+ vxh->vx_flags |= htonl(VXLAN_HF_GPE_NP | next_proto);
+}
+
static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
struct vxlan_metadata *md)
{
@@ -1750,6 +1832,9 @@ static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
if (vxflags & VXLAN_F_GBP)
vxlan_build_gbp_hdr(vxh, vxflags, md);
+ if (vxflags & VXLAN_F_GPE)
+ vxlan_build_gpe_hdr(vxh, skb->protocol);
+
skb_set_inner_protocol(skb, htons(ETH_P_TEB));
return 0;
}
@@ -2073,6 +2158,26 @@ static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
struct vxlan_rdst *rdst, *fdst = NULL;
struct vxlan_fdb *f;
+ if (vxlan->flags & VXLAN_F_GPE) {
+ switch (skb->protocol) {
+#if IS_ENABLED(CONFIG_NET_NSH)
+ case htons(ETH_P_NSH):
+#endif
+#if IS_ENABLED(CONFIG_IPV6)
+ case htons(ETH_P_IPV6):
+#endif
+#if IS_ENABLED(CONFIG_MPLS)
+ case htons(ETH_P_MPLS_UC):
+#endif
+ case htons(ETH_P_IP):
+ vxlan_xmit_one(skb, dev, &vxlan->default_dst, false);
+ return NETDEV_TX_OK;
+ default:
+ /* Assume L2 and look for FDB entry */
+ break;
+ }
+ }
+
info = skb_tunnel_info(skb);
skb_reset_mac_header(skb);
@@ -2475,6 +2580,7 @@ static const struct nla_policy vxlan_policy[IFLA_VXLAN_MAX + 1] = {
[IFLA_VXLAN_REMCSUM_RX] = { .type = NLA_U8 },
[IFLA_VXLAN_GBP] = { .type = NLA_FLAG, },
[IFLA_VXLAN_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG },
+ [IFLA_VXLAN_GPE] = { .type = NLA_FLAG, },
};
static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
@@ -2895,6 +3001,9 @@ static int vxlan_newlink(struct net *src_net, struct net_device *dev,
if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL])
conf.flags |= VXLAN_F_REMCSUM_NOPARTIAL;
+ if (data[IFLA_VXLAN_GPE])
+ conf.flags |= VXLAN_F_GPE;
+
err = vxlan_dev_configure(src_net, dev, &conf);
switch (err) {
case -ENODEV:
@@ -3037,6 +3146,10 @@ static int vxlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
nla_put_flag(skb, IFLA_VXLAN_REMCSUM_NOPARTIAL))
goto nla_put_failure;
+ if (vxlan->flags & VXLAN_F_GPE &&
+ nla_put_flag(skb, IFLA_VXLAN_GPE))
+ goto nla_put_failure;
+
return 0;
nla_put_failure:
diff --git a/include/net/vxlan.h b/include/net/vxlan.h
index 25bd919..7886296 100644
--- a/include/net/vxlan.h
+++ b/include/net/vxlan.h
@@ -121,8 +121,44 @@ struct vxlanhdr_gbp {
struct vxlan_metadata {
u32 gbp;
+ u8 gpe_np;
};
+/*
+ * VXLAN Generic Protocol Extension:
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |R|R|Ver|I|P|R|O| Reserved |Next Protocol |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | VXLAN Network Identifier (VNI) | Reserved |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *
+ * Ver Version, initially 0
+ * I = 1 VXLAN Network Identifier (VNI) present
+ * P = 1 Next Protocol field is present
+ * O = 1 OAM
+ * Next Protocol Indicates the protocol header immediately following
+ * the VXLAN GPE header.
+ *
+ * https://tools.ietf.org/html/draft-ietf-nvo3-vxlan-gpe-01
+ *
+ * Use struct vxlanhdr above with some extra defines:
+ */
+#define VXLAN_HF_GPE_OAM BIT(25) /* GPE OAM bit */
+#define VXLAN_HF_GPE_NP BIT(26) /* GPE protocol bit */
+
+#define VXLAN_GPE_NP_MASK (0xFF)
+
+#define VXLAN_GPE_NP_IPv4 0x1
+#define VXLAN_GPE_NP_IPv6 0x2
+#define VXLAN_GPE_NP_ETH 0x3
+#define VXLAN_GPE_NP_NSH 0x4
+#define VXLAN_GPE_NP_MPLS 0x5
+
+#define VXLAN_GPE_USED_BITS (VXLAN_HF_GPE_NP | \
+ VXLAN_HF_GPE_OAM | \
+ VXLAN_GPE_NP_MASK)
+
+
/* per UDP socket information */
struct vxlan_sock {
struct hlist_node hlist;
@@ -204,6 +240,7 @@ struct vxlan_dev {
#define VXLAN_F_GBP 0x800
#define VXLAN_F_REMCSUM_NOPARTIAL 0x1000
#define VXLAN_F_COLLECT_METADATA 0x2000
+#define VXLAN_F_GPE 0x4000
/* Flags that are used in the receive path. These flags must match in
* order for a socket to be shareable
@@ -212,7 +249,8 @@ struct vxlan_dev {
VXLAN_F_UDP_ZERO_CSUM6_RX | \
VXLAN_F_REMCSUM_RX | \
VXLAN_F_REMCSUM_NOPARTIAL | \
- VXLAN_F_COLLECT_METADATA)
+ VXLAN_F_COLLECT_METADATA | \
+ VXLAN_F_GPE)
struct net_device *vxlan_dev_create(struct net *net, const char *name,
u8 name_assign_type, struct vxlan_config *conf);
diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
index d452cea..e8d74a5 100644
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -456,6 +456,7 @@ enum {
IFLA_VXLAN_GBP,
IFLA_VXLAN_REMCSUM_NOPARTIAL,
IFLA_VXLAN_COLLECT_METADATA,
+ IFLA_VXLAN_GPE,
__IFLA_VXLAN_MAX
};
#define IFLA_VXLAN_MAX (__IFLA_VXLAN_MAX - 1)
--
2.1.4
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