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Message-Id: <6fe53252314d644e994950522d4320bc54ced928.1456472746.git.jbenc@redhat.com>
Date: Fri, 26 Feb 2016 08:48:37 +0100
From: Jiri Benc <jbenc@...hat.com>
To: netdev@...r.kernel.org
Subject: [PATCH net-next 1/5] vxlan: implement GPE in L2 mode
Implement VXLAN-GPE. Only L2 mode (i.e. encapsulated Ethernet frame) is
supported by this patch.
L3 mode will be added by subsequent patches.
Signed-off-by: Jiri Benc <jbenc@...hat.com>
---
drivers/net/vxlan.c | 68 ++++++++++++++++++++++++++++++++++++++++++--
include/net/vxlan.h | 62 +++++++++++++++++++++++++++++++++++++++-
include/uapi/linux/if_link.h | 8 ++++++
3 files changed, 135 insertions(+), 3 deletions(-)
diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 775ddb48388d..c7844bae339d 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -1192,6 +1192,33 @@ out:
unparsed->vx_flags &= ~VXLAN_GBP_USED_BITS;
}
+static bool vxlan_parse_gpe_hdr(struct vxlanhdr *unparsed,
+ struct sk_buff *skb, u32 vxflags)
+{
+ struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)unparsed;
+
+ /* Need to have Next Protocol set for interfaces in GPE mode. */
+ if (!gpe->np_applied)
+ return false;
+ /* "The initial version is 0. If a receiver does not support the
+ * version indicated it MUST drop the packet.
+ */
+ if (gpe->version != 0)
+ return false;
+ /* "When the O bit is set to 1, the packet is an OAM packet and OAM
+ * processing MUST occur." However, we don't implement OAM
+ * processing, thus drop the packet.
+ */
+ if (gpe->oam_flag)
+ return false;
+
+ if (gpe->next_protocol != VXLAN_GPE_NP_ETHERNET)
+ return false;
+
+ unparsed->vx_flags &= ~VXLAN_GPE_USED_BITS;
+ return true;
+}
+
static bool vxlan_set_mac(struct vxlan_dev *vxlan,
struct vxlan_sock *vs,
struct sk_buff *skb)
@@ -1307,6 +1334,9 @@ static int vxlan_rcv(struct sock *sk, struct sk_buff *skb)
/* For backwards compatibility, only allow reserved fields to be
* used by VXLAN extensions if explicitly requested.
*/
+ if (vs->flags & VXLAN_F_GPE)
+ if (!vxlan_parse_gpe_hdr(&unparsed, skb, vs->flags))
+ goto drop;
if (vs->flags & VXLAN_F_REMCSUM_RX)
if (!vxlan_remcsum(&unparsed, skb, vs->flags))
goto drop;
@@ -1685,6 +1715,14 @@ static void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, u32 vxflags,
gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
}
+static void vxlan_build_gpe_hdr(struct vxlanhdr *vxh, u32 vxflags)
+{
+ struct vxlanhdr_gpe *gpe = (struct vxlanhdr_gpe *)vxh;
+
+ gpe->np_applied = 1;
+ gpe->next_protocol = VXLAN_GPE_NP_ETHERNET;
+}
+
static int vxlan_build_skb(struct sk_buff *skb, struct dst_entry *dst,
int iphdr_len, __be32 vni,
struct vxlan_metadata *md, u32 vxflags,
@@ -1744,6 +1782,8 @@ 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, vxflags);
skb_set_inner_protocol(skb, htons(ETH_P_TEB));
return 0;
@@ -2515,6 +2555,7 @@ 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_MODE] = { .type = NLA_U8, },
};
static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
@@ -2714,6 +2755,10 @@ static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
__be16 default_port = vxlan->cfg.dst_port;
struct net_device *lowerdev = NULL;
+ if (((conf->flags & VXLAN_F_LEARN) && (conf->flags & VXLAN_F_GPE)) ||
+ ((conf->flags & VXLAN_F_GBP) && (conf->flags & VXLAN_F_GPE)))
+ return -EINVAL;
+
vxlan->net = src_net;
dst->remote_vni = conf->vni;
@@ -2770,8 +2815,12 @@ static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
dev->needed_headroom = needed_headroom;
memcpy(&vxlan->cfg, conf, sizeof(*conf));
- if (!vxlan->cfg.dst_port)
- vxlan->cfg.dst_port = default_port;
+ if (!vxlan->cfg.dst_port) {
+ if (conf->flags & VXLAN_F_GPE)
+ vxlan->cfg.dst_port = 4790; /* IANA assigned VXLAN-GPE port */
+ else
+ vxlan->cfg.dst_port = default_port;
+ }
vxlan->flags |= conf->flags;
if (!vxlan->cfg.age_interval)
@@ -2941,6 +2990,13 @@ 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_MODE]) {
+ u8 mode = nla_get_u8(data[IFLA_VXLAN_GPE_MODE]);
+
+ if (mode > 0 && mode <= VXLAN_GPE_MODE_MAX)
+ conf.flags |= VXLAN_F_GPE;
+ }
+
err = vxlan_dev_configure(src_net, dev, &conf);
switch (err) {
case -ENODEV:
@@ -2954,6 +3010,10 @@ static int vxlan_newlink(struct net *src_net, struct net_device *dev,
case -EEXIST:
pr_info("duplicate VNI %u\n", be32_to_cpu(conf.vni));
break;
+
+ case -EINVAL:
+ pr_info("unsupported combination of extensions\n");
+ break;
}
return err;
@@ -3083,6 +3143,10 @@ 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_u8(skb, IFLA_VXLAN_GPE_MODE, VXLAN_GPE_MODE_L2))
+ goto nla_put_failure;
+
return 0;
nla_put_failure:
diff --git a/include/net/vxlan.h b/include/net/vxlan.h
index 6eda4ed4d78b..7c5f1385bdfd 100644
--- a/include/net/vxlan.h
+++ b/include/net/vxlan.h
@@ -119,6 +119,64 @@ struct vxlanhdr_gbp {
#define VXLAN_GBP_POLICY_APPLIED (BIT(3) << 16)
#define VXLAN_GBP_ID_MASK (0xFFFF)
+/*
+ * VXLAN Generic Protocol Extension (VXLAN_F_GPE):
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |R|R|Ver|I|P|R|O| Reserved |Next Protocol |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | VXLAN Network Identifier (VNI) | Reserved |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *
+ * Ver = Version. Indicates VXLAN GPE protocol version.
+ *
+ * P = Next Protocol Bit. The P bit is set to indicate that the
+ * Next Protocol field is present.
+ *
+ * O = OAM Flag Bit. The O bit is set to indicate that the packet
+ * is an OAM packet.
+ *
+ * Next Protocol = This 8 bit field indicates the protocol header
+ * immediately following the VXLAN GPE header.
+ *
+ * https://tools.ietf.org/html/draft-ietf-nvo3-vxlan-gpe-01
+ */
+
+struct vxlanhdr_gpe {
+#if defined(__LITTLE_ENDIAN_BITFIELD)
+ u8 oam_flag:1,
+ reserved_flags1:1,
+ np_applied:1,
+ instance_applied:1,
+ version:2,
+reserved_flags2:2;
+#elif defined(__BIG_ENDIAN_BITFIELD)
+ u8 reserved_flags2:2,
+ version:2,
+ instance_applied:1,
+ np_applied:1,
+ reserved_flags1:1,
+ oam_flag:1;
+#endif
+ u8 reserved_flags3;
+ u8 reserved_flags4;
+ u8 next_protocol;
+ __be32 vx_vni;
+};
+
+/* VXLAN-GPE header flags. */
+#define VXLAN_HF_VER cpu_to_be32(BIT(29) | BIT(28))
+#define VXLAN_HF_NP cpu_to_be32(BIT(26))
+#define VXLAN_HF_OAM cpu_to_be32(BIT(24))
+
+#define VXLAN_GPE_USED_BITS (VXLAN_HF_VER | VXLAN_HF_NP | VXLAN_HF_OAM | \
+ cpu_to_be32(0xff))
+
+/* VXLAN-GPE header Next Protocol. */
+#define VXLAN_GPE_NP_IPV4 0x01
+#define VXLAN_GPE_NP_IPV6 0x02
+#define VXLAN_GPE_NP_ETHERNET 0x03
+#define VXLAN_GPE_NP_NSH 0x04
+
struct vxlan_metadata {
u32 gbp;
};
@@ -205,6 +263,7 @@ 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
@@ -213,7 +272,8 @@ 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 d452cea59020..c2b2b7462731 100644
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -456,10 +456,18 @@ enum {
IFLA_VXLAN_GBP,
IFLA_VXLAN_REMCSUM_NOPARTIAL,
IFLA_VXLAN_COLLECT_METADATA,
+ IFLA_VXLAN_GPE_MODE,
__IFLA_VXLAN_MAX
};
#define IFLA_VXLAN_MAX (__IFLA_VXLAN_MAX - 1)
+enum vxlan_gpe_mode {
+ VXLAN_GPE_MODE_DISABLED = 0,
+ VXLAN_GPE_MODE_L2,
+ __VXLAN_GPE_MODE_MAX
+};
+#define VXLAN_GPE_MODE_MAX (__VXLAN_GPE_MODE_MAX - 1)
+
struct ifla_vxlan_port_range {
__be16 low;
__be16 high;
--
1.8.3.1
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