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Date: Mon, 25 Feb 2019 22:03:01 -0800
From: Roopa Prabhu <roopa@...ulusnetworks.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org, dsa@...ulusnetworks.com,
sd@...asysnail.net, johannes@...solutions.net
Subject: [PATCH net-next 1/2] vxlan: add extack support for create and changelink
From: Roopa Prabhu <roopa@...ulusnetworks.com>
This patch adds extack coverage in vxlan link
create and changelink paths. Introduces a new helper
vxlan_nl2flags to consolidate flag attribute validation.
thanks to Johannes Berg for some tips to construct the
generic vxlan flag extack strings.
Signed-off-by: Roopa Prabhu <roopa@...ulusnetworks.com>
---
drivers/net/vxlan.c | 208 +++++++++++++++++++++++++++++++++++-----------------
include/net/vxlan.h | 31 ++++++++
2 files changed, 172 insertions(+), 67 deletions(-)
diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 577201c..a3c46d7 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -3583,11 +3583,40 @@ static int __vxlan_dev_create(struct net *net, struct net_device *dev,
return err;
}
+/* Set/clear flags based on attribute */
+static int vxlan_nl2flag(struct vxlan_config *conf, struct nlattr *tb[],
+ int attrtype, unsigned long mask, bool changelink,
+ bool changelink_supported,
+ struct netlink_ext_ack *extack)
+{
+ unsigned long flags;
+
+ if (!tb[attrtype])
+ return 0;
+
+ if (changelink && !changelink_supported) {
+ vxlan_flag_attr_error(attrtype, extack);
+ return -EOPNOTSUPP;
+ }
+
+ if (vxlan_policy[attrtype].type == NLA_FLAG)
+ flags = conf->flags | mask;
+ else if (nla_get_u8(tb[attrtype]))
+ flags = conf->flags | mask;
+ else
+ flags = conf->flags & ~mask;
+
+ conf->flags = flags;
+
+ return 0;
+}
+
static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[],
struct net_device *dev, struct vxlan_config *conf,
- bool changelink)
+ bool changelink, struct netlink_ext_ack *extack)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
+ int err = 0;
memset(conf, 0, sizeof(*conf));
@@ -3598,40 +3627,54 @@ static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[],
if (data[IFLA_VXLAN_ID]) {
__be32 vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
- if (changelink && (vni != conf->vni))
+ if (changelink && (vni != conf->vni)) {
+ NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_ID], "Cannot change VNI");
return -EOPNOTSUPP;
+ }
conf->vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
}
if (data[IFLA_VXLAN_GROUP]) {
- if (changelink && (conf->remote_ip.sa.sa_family != AF_INET))
+ if (changelink && (conf->remote_ip.sa.sa_family != AF_INET)) {
+ NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP], "New group address family does not match old group");
return -EOPNOTSUPP;
+ }
conf->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
conf->remote_ip.sa.sa_family = AF_INET;
} else if (data[IFLA_VXLAN_GROUP6]) {
- if (!IS_ENABLED(CONFIG_IPV6))
+ if (!IS_ENABLED(CONFIG_IPV6)) {
+ NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "IPv6 support not enabled in the kernel");
return -EPFNOSUPPORT;
+ }
- if (changelink && (conf->remote_ip.sa.sa_family != AF_INET6))
+ if (changelink && (conf->remote_ip.sa.sa_family != AF_INET6)) {
+ NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_GROUP6], "New group address family does not match old group");
return -EOPNOTSUPP;
+ }
conf->remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
conf->remote_ip.sa.sa_family = AF_INET6;
}
if (data[IFLA_VXLAN_LOCAL]) {
- if (changelink && (conf->saddr.sa.sa_family != AF_INET))
+ if (changelink && (conf->saddr.sa.sa_family != AF_INET)) {
+ NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL], "New local address family does not match old");
return -EOPNOTSUPP;
+ }
conf->saddr.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_LOCAL]);
conf->saddr.sa.sa_family = AF_INET;
} else if (data[IFLA_VXLAN_LOCAL6]) {
- if (!IS_ENABLED(CONFIG_IPV6))
+ if (!IS_ENABLED(CONFIG_IPV6)) {
+ NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "IPv6 support not enabled in the kernel");
return -EPFNOSUPPORT;
+ }
- if (changelink && (conf->saddr.sa.sa_family != AF_INET6))
+ if (changelink && (conf->saddr.sa.sa_family != AF_INET6)) {
+ NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LOCAL6], "New local address family does not match old");
return -EOPNOTSUPP;
+ }
/* TODO: respect scope id */
conf->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
@@ -3648,9 +3691,12 @@ static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[],
conf->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
if (data[IFLA_VXLAN_TTL_INHERIT]) {
- if (changelink)
- return -EOPNOTSUPP;
- conf->flags |= VXLAN_F_TTL_INHERIT;
+ err = vxlan_nl2flag(conf, data, IFLA_VXLAN_TTL_INHERIT,
+ VXLAN_F_TTL_INHERIT, changelink, false,
+ extack);
+ if (err)
+ return err;
+
}
if (data[IFLA_VXLAN_LABEL])
@@ -3658,10 +3704,11 @@ static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[],
IPV6_FLOWLABEL_MASK;
if (data[IFLA_VXLAN_LEARNING]) {
- if (nla_get_u8(data[IFLA_VXLAN_LEARNING]))
- conf->flags |= VXLAN_F_LEARN;
- else
- conf->flags &= ~VXLAN_F_LEARN;
+ err = vxlan_nl2flag(conf, data, IFLA_VXLAN_LEARNING,
+ VXLAN_F_LEARN, changelink, true,
+ extack);
+ if (err)
+ return err;
} else if (!changelink) {
/* default to learn on a new device */
conf->flags |= VXLAN_F_LEARN;
@@ -3671,44 +3718,52 @@ static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[],
conf->age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
if (data[IFLA_VXLAN_PROXY]) {
- if (changelink)
- return -EOPNOTSUPP;
- if (nla_get_u8(data[IFLA_VXLAN_PROXY]))
- conf->flags |= VXLAN_F_PROXY;
+ err = vxlan_nl2flag(conf, data, IFLA_VXLAN_PROXY,
+ VXLAN_F_PROXY, changelink, false,
+ extack);
+ if (err)
+ return err;
}
if (data[IFLA_VXLAN_RSC]) {
- if (changelink)
- return -EOPNOTSUPP;
- if (nla_get_u8(data[IFLA_VXLAN_RSC]))
- conf->flags |= VXLAN_F_RSC;
+ err = vxlan_nl2flag(conf, data, IFLA_VXLAN_RSC,
+ VXLAN_F_RSC, changelink, false,
+ extack);
+ if (err)
+ return err;
}
if (data[IFLA_VXLAN_L2MISS]) {
- if (changelink)
- return -EOPNOTSUPP;
- if (nla_get_u8(data[IFLA_VXLAN_L2MISS]))
- conf->flags |= VXLAN_F_L2MISS;
+ err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L2MISS,
+ VXLAN_F_L2MISS, changelink, false,
+ extack);
+ if (err)
+ return err;
}
if (data[IFLA_VXLAN_L3MISS]) {
- if (changelink)
- return -EOPNOTSUPP;
- if (nla_get_u8(data[IFLA_VXLAN_L3MISS]))
- conf->flags |= VXLAN_F_L3MISS;
+ err = vxlan_nl2flag(conf, data, IFLA_VXLAN_L3MISS,
+ VXLAN_F_L3MISS, changelink, false,
+ extack);
+ if (err)
+ return err;
}
if (data[IFLA_VXLAN_LIMIT]) {
- if (changelink)
+ if (changelink) {
+ NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_LIMIT],
+ "Cannot change limit");
return -EOPNOTSUPP;
+ }
conf->addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
}
if (data[IFLA_VXLAN_COLLECT_METADATA]) {
- if (changelink)
- return -EOPNOTSUPP;
- if (nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
- conf->flags |= VXLAN_F_COLLECT_METADATA;
+ err = vxlan_nl2flag(conf, data, IFLA_VXLAN_COLLECT_METADATA,
+ VXLAN_F_COLLECT_METADATA, changelink, false,
+ extack);
+ if (err)
+ return err;
}
if (data[IFLA_VXLAN_PORT_RANGE]) {
@@ -3718,72 +3773,92 @@ static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[],
conf->port_min = ntohs(p->low);
conf->port_max = ntohs(p->high);
} else {
+ NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT_RANGE],
+ "Cannot change port range");
return -EOPNOTSUPP;
}
}
if (data[IFLA_VXLAN_PORT]) {
- if (changelink)
+ if (changelink) {
+ NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_PORT],
+ "Cannot change port");
return -EOPNOTSUPP;
+ }
conf->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
}
if (data[IFLA_VXLAN_UDP_CSUM]) {
- if (changelink)
+ if (changelink) {
+ NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_VXLAN_UDP_CSUM],
+ "Cannot change UDP_CSUM flag");
return -EOPNOTSUPP;
+ }
if (!nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
conf->flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
}
if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]) {
- if (changelink)
- return -EOPNOTSUPP;
- if (nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
- conf->flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
+ err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_TX,
+ VXLAN_F_UDP_ZERO_CSUM6_TX, changelink,
+ false, extack);
+ if (err)
+ return err;
}
if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]) {
- if (changelink)
- return -EOPNOTSUPP;
- if (nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
- conf->flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
+ err = vxlan_nl2flag(conf, data, IFLA_VXLAN_UDP_ZERO_CSUM6_RX,
+ VXLAN_F_UDP_ZERO_CSUM6_RX, changelink,
+ false, extack);
+ if (err)
+ return err;
}
if (data[IFLA_VXLAN_REMCSUM_TX]) {
- if (changelink)
- return -EOPNOTSUPP;
- if (nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
- conf->flags |= VXLAN_F_REMCSUM_TX;
+ err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_TX,
+ VXLAN_F_REMCSUM_TX, changelink, false,
+ extack);
+ if (err)
+ return err;
}
if (data[IFLA_VXLAN_REMCSUM_RX]) {
- if (changelink)
- return -EOPNOTSUPP;
- if (nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
- conf->flags |= VXLAN_F_REMCSUM_RX;
+ err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_RX,
+ VXLAN_F_REMCSUM_RX, changelink, false,
+ extack);
+ if (err)
+ return err;
}
if (data[IFLA_VXLAN_GBP]) {
- if (changelink)
- return -EOPNOTSUPP;
- conf->flags |= VXLAN_F_GBP;
+ err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GBP,
+ VXLAN_F_GBP, changelink, false, extack);
+ if (err)
+ return err;
}
if (data[IFLA_VXLAN_GPE]) {
- if (changelink)
- return -EOPNOTSUPP;
- conf->flags |= VXLAN_F_GPE;
+ err = vxlan_nl2flag(conf, data, IFLA_VXLAN_GPE,
+ VXLAN_F_GPE, changelink, false,
+ extack);
+ if (err)
+ return err;
}
if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL]) {
- if (changelink)
- return -EOPNOTSUPP;
- conf->flags |= VXLAN_F_REMCSUM_NOPARTIAL;
+ err = vxlan_nl2flag(conf, data, IFLA_VXLAN_REMCSUM_NOPARTIAL,
+ VXLAN_F_REMCSUM_NOPARTIAL, changelink,
+ false, extack);
+ if (err)
+ return err;
}
if (tb[IFLA_MTU]) {
- if (changelink)
+ if (changelink) {
+ NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_MTU],
+ "Cannot change mtu");
return -EOPNOTSUPP;
+ }
conf->mtu = nla_get_u32(tb[IFLA_MTU]);
}
@@ -3800,7 +3875,7 @@ static int vxlan_newlink(struct net *src_net, struct net_device *dev,
struct vxlan_config conf;
int err;
- err = vxlan_nl2conf(tb, data, dev, &conf, false);
+ err = vxlan_nl2conf(tb, data, dev, &conf, false, extack);
if (err)
return err;
@@ -3817,8 +3892,7 @@ static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
struct vxlan_config conf;
int err;
- err = vxlan_nl2conf(tb, data,
- dev, &conf, true);
+ err = vxlan_nl2conf(tb, data, dev, &conf, true, extack);
if (err)
return err;
diff --git a/include/net/vxlan.h b/include/net/vxlan.h
index 0976781..00254a5 100644
--- a/include/net/vxlan.h
+++ b/include/net/vxlan.h
@@ -453,4 +453,35 @@ vxlan_fdb_clear_offload(const struct net_device *dev, __be32 vni)
}
#endif
+static inline void vxlan_flag_attr_error(int attrtype,
+ struct netlink_ext_ack *extack)
+{
+#define VXLAN_FLAG(flg) \
+ case IFLA_VXLAN_##flg: \
+ NL_SET_ERR_MSG_MOD(extack, \
+ "cannot change " #flg " flag"); \
+ break
+ switch (attrtype) {
+ VXLAN_FLAG(TTL_INHERIT);
+ VXLAN_FLAG(LEARNING);
+ VXLAN_FLAG(PROXY);
+ VXLAN_FLAG(RSC);
+ VXLAN_FLAG(L2MISS);
+ VXLAN_FLAG(L3MISS);
+ VXLAN_FLAG(COLLECT_METADATA);
+ VXLAN_FLAG(UDP_ZERO_CSUM6_TX);
+ VXLAN_FLAG(UDP_ZERO_CSUM6_RX);
+ VXLAN_FLAG(REMCSUM_TX);
+ VXLAN_FLAG(REMCSUM_RX);
+ VXLAN_FLAG(GBP);
+ VXLAN_FLAG(GPE);
+ VXLAN_FLAG(REMCSUM_NOPARTIAL);
+ default:
+ NL_SET_ERR_MSG_MOD(extack, \
+ "cannot change flag");
+ break;
+ }
+#undef VXLAN_FLAG
+}
+
#endif
--
2.1.4
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