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vxlan: add changelink support 

This patch adds changelink rtnl op support for vxlan netdevs.
code changes involve:
    - refactor vxlan_newlink into vxlan_nl2conf to be
    used by vxlan_newlink and vxlan_changelink
    - vxlan_nl2conf and vxlan_dev_configure take a
    changelink argument to isolate changelink checks
    and updates.
    - Allow changing only a few attributes:
        - return -EOPNOTSUPP for attributes that cannot
        be changed for now. Incremental patches can
        make the non-supported one available in the future
        if needed.

Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Roopa Prabhu 2017-02-20 08:29:19 -08:00 committed by David S. Miller
parent d1892e4ec9
commit 8bcdc4f3a2
1 changed files with 289 additions and 132 deletions
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421
drivers/net/vxlan.c
View File

@ -2835,39 +2835,40 @@ static int vxlan_sock_add(struct vxlan_dev *vxlan)
}
static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
struct vxlan_config *conf)
struct vxlan_config *conf,
bool changelink)
{
struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
struct vxlan_dev *vxlan = netdev_priv(dev), *tmp;
struct vxlan_rdst *dst = &vxlan->default_dst;
unsigned short needed_headroom = ETH_HLEN;
int err;
bool use_ipv6 = false;
__be16 default_port = vxlan->cfg.dst_port;
struct net_device *lowerdev = NULL;
if (conf->flags & VXLAN_F_GPE) {
/* For now, allow GPE only together with COLLECT_METADATA.
* This can be relaxed later; in such case, the other side
* of the PtP link will have to be provided.
*/
if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) ||
!(conf->flags & VXLAN_F_COLLECT_METADATA)) {
pr_info("unsupported combination of extensions\n");
return -EINVAL;
if (!changelink) {
if (conf->flags & VXLAN_F_GPE) {
/* For now, allow GPE only together with
* COLLECT_METADATA. This can be relaxed later; in such
* case, the other side of the PtP link will have to be
* provided.
*/
if ((conf->flags & ~VXLAN_F_ALLOWED_GPE) ||
!(conf->flags & VXLAN_F_COLLECT_METADATA)) {
pr_info("unsupported combination of extensions\n");
return -EINVAL;
}
vxlan_raw_setup(dev);
} else {
vxlan_ether_setup(dev);
}
vxlan_raw_setup(dev);
} else {
vxlan_ether_setup(dev);
/* MTU range: 68 - 65535 */
dev->min_mtu = ETH_MIN_MTU;
dev->max_mtu = ETH_MAX_MTU;
vxlan->net = src_net;
}
/* MTU range: 68 - 65535 */
dev->min_mtu = ETH_MIN_MTU;
dev->max_mtu = ETH_MAX_MTU;
vxlan->net = src_net;
dst->remote_vni = conf->vni;
memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
@ -2889,12 +2890,14 @@ static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
return -EINVAL;
}
if (conf->remote_ifindex) {
if (conf->remote_ifindex &&
conf->remote_ifindex != vxlan->cfg.remote_ifindex) {
lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
dst->remote_ifindex = conf->remote_ifindex;
if (!lowerdev) {
pr_info("ifindex %d does not exist\n", dst->remote_ifindex);
pr_info("ifindex %d does not exist\n",
dst->remote_ifindex);
return -ENODEV;
}
@ -2913,7 +2916,8 @@ static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
(use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
needed_headroom = lowerdev->hard_header_len;
} else if (vxlan_addr_multicast(&dst->remote_ip)) {
} else if (!conf->remote_ifindex &&
vxlan_addr_multicast(&dst->remote_ip)) {
pr_info("multicast destination requires interface to be specified\n");
return -EINVAL;
}
@ -2953,6 +2957,9 @@ static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
if (!vxlan->cfg.age_interval)
vxlan->cfg.age_interval = FDB_AGE_DEFAULT;
if (changelink)
return 0;
list_for_each_entry(tmp, &vn->vxlan_list, next) {
if (tmp->cfg.vni == conf->vni &&
(tmp->default_dst.remote_ip.sa.sa_family == AF_INET6 ||
@ -2965,14 +2972,226 @@ static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
}
}
return 0;
}
static int vxlan_nl2conf(struct nlattr *tb[], struct nlattr *data[],
struct net_device *dev, struct vxlan_config *conf,
bool changelink)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
memset(conf, 0, sizeof(*conf));
/* if changelink operation, start with old existing cfg */
if (changelink)
memcpy(conf, &vxlan->cfg, sizeof(*conf));
if (data[IFLA_VXLAN_ID]) {
__be32 vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
if (changelink && (vni != conf->vni))
return -EOPNOTSUPP;
conf->vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
}
if (data[IFLA_VXLAN_GROUP]) {
conf->remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
} else if (data[IFLA_VXLAN_GROUP6]) {
if (!IS_ENABLED(CONFIG_IPV6))
return -EPFNOSUPPORT;
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]) {
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))
return -EPFNOSUPPORT;
/* TODO: respect scope id */
conf->saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
conf->saddr.sa.sa_family = AF_INET6;
}
if (data[IFLA_VXLAN_LINK])
conf->remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
if (data[IFLA_VXLAN_TOS])
conf->tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
if (data[IFLA_VXLAN_TTL])
conf->ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
if (data[IFLA_VXLAN_LABEL])
conf->label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
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;
vxlan->flags &= ~VXLAN_F_LEARN;
}
} else if (!changelink) {
/* default to learn on a new device */
conf->flags |= VXLAN_F_LEARN;
}
if (data[IFLA_VXLAN_AGEING]) {
if (changelink)
return -EOPNOTSUPP;
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;
}
if (data[IFLA_VXLAN_RSC]) {
if (changelink)
return -EOPNOTSUPP;
if (nla_get_u8(data[IFLA_VXLAN_RSC]))
conf->flags |= VXLAN_F_RSC;
}
if (data[IFLA_VXLAN_L2MISS]) {
if (changelink)
return -EOPNOTSUPP;
if (nla_get_u8(data[IFLA_VXLAN_L2MISS]))
conf->flags |= VXLAN_F_L2MISS;
}
if (data[IFLA_VXLAN_L3MISS]) {
if (changelink)
return -EOPNOTSUPP;
if (nla_get_u8(data[IFLA_VXLAN_L3MISS]))
conf->flags |= VXLAN_F_L3MISS;
}
if (data[IFLA_VXLAN_LIMIT]) {
if (changelink)
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;
}
if (data[IFLA_VXLAN_PORT_RANGE]) {
if (!changelink) {
const struct ifla_vxlan_port_range *p
= nla_data(data[IFLA_VXLAN_PORT_RANGE]);
conf->port_min = ntohs(p->low);
conf->port_max = ntohs(p->high);
} else {
return -EOPNOTSUPP;
}
}
if (data[IFLA_VXLAN_PORT]) {
if (changelink)
return -EOPNOTSUPP;
conf->dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
}
if (data[IFLA_VXLAN_UDP_CSUM]) {
if (changelink)
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;
}
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;
}
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;
}
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;
}
if (data[IFLA_VXLAN_GBP]) {
if (changelink)
return -EOPNOTSUPP;
conf->flags |= VXLAN_F_GBP;
}
if (data[IFLA_VXLAN_GPE]) {
if (changelink)
return -EOPNOTSUPP;
conf->flags |= VXLAN_F_GPE;
}
if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL]) {
if (changelink)
return -EOPNOTSUPP;
conf->flags |= VXLAN_F_REMCSUM_NOPARTIAL;
}
if (tb[IFLA_MTU]) {
if (changelink)
return -EOPNOTSUPP;
conf->mtu = nla_get_u32(tb[IFLA_MTU]);
}
return 0;
}
static int vxlan_newlink(struct net *src_net, struct net_device *dev,
struct nlattr *tb[], struct nlattr *data[])
{
struct vxlan_net *vn = net_generic(src_net, vxlan_net_id);
struct vxlan_dev *vxlan = netdev_priv(dev);
struct vxlan_config conf;
int err;
err = vxlan_nl2conf(tb, data, dev, &conf, false);
if (err)
return err;
err = vxlan_dev_configure(src_net, dev, &conf, false);
if (err)
return err;
dev->ethtool_ops = &vxlan_ethtool_ops;
/* create an fdb entry for a valid default destination */
if (!vxlan_addr_any(&vxlan->default_dst.remote_ip)) {
err = vxlan_fdb_create(vxlan, all_zeros_mac,
&vxlan->default_dst.remote_ip,
NUD_REACHABLE|NUD_PERMANENT,
NLM_F_EXCL|NLM_F_CREATE,
NUD_REACHABLE | NUD_PERMANENT,
NLM_F_EXCL | NLM_F_CREATE,
vxlan->cfg.dst_port,
vxlan->default_dst.remote_vni,
vxlan->default_dst.remote_vni,
@ -2984,7 +3203,7 @@ static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
err = register_netdevice(dev);
if (err) {
vxlan_fdb_delete_default(vxlan, vxlan->cfg.vni);
vxlan_fdb_delete_default(vxlan, vxlan->default_dst.remote_vni);
return err;
}
@ -2993,119 +3212,56 @@ static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
return 0;
}
static int vxlan_newlink(struct net *src_net, struct net_device *dev,
struct nlattr *tb[], struct nlattr *data[])
static int vxlan_changelink(struct net_device *dev, struct nlattr *tb[],
struct nlattr *data[])
{
struct vxlan_dev *vxlan = netdev_priv(dev);
struct vxlan_rdst *dst = &vxlan->default_dst;
struct vxlan_rdst old_dst;
struct vxlan_config conf;
int err;
memset(&conf, 0, sizeof(conf));
err = vxlan_nl2conf(tb, data,
dev, &conf, true);
if (err)
return err;
if (data[IFLA_VXLAN_ID])
conf.vni = cpu_to_be32(nla_get_u32(data[IFLA_VXLAN_ID]));
memcpy(&old_dst, dst, sizeof(struct vxlan_rdst));
if (data[IFLA_VXLAN_GROUP]) {
conf.remote_ip.sin.sin_addr.s_addr = nla_get_in_addr(data[IFLA_VXLAN_GROUP]);
} else if (data[IFLA_VXLAN_GROUP6]) {
if (!IS_ENABLED(CONFIG_IPV6))
return -EPFNOSUPPORT;
err = vxlan_dev_configure(vxlan->net, dev, &conf, true);
if (err)
return err;
conf.remote_ip.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_GROUP6]);
conf.remote_ip.sa.sa_family = AF_INET6;
/* handle default dst entry */
if (!vxlan_addr_equal(&dst->remote_ip, &old_dst.remote_ip)) {
spin_lock_bh(&vxlan->hash_lock);
if (!vxlan_addr_any(&old_dst.remote_ip))
__vxlan_fdb_delete(vxlan, all_zeros_mac,
old_dst.remote_ip,
vxlan->cfg.dst_port,
old_dst.remote_vni,
old_dst.remote_vni,
old_dst.remote_ifindex, 0);
if (!vxlan_addr_any(&dst->remote_ip)) {
err = vxlan_fdb_create(vxlan, all_zeros_mac,
&dst->remote_ip,
NUD_REACHABLE | NUD_PERMANENT,
NLM_F_CREATE | NLM_F_APPEND,
vxlan->cfg.dst_port,
dst->remote_vni,
dst->remote_vni,
dst->remote_ifindex,
NTF_SELF);
if (err) {
spin_unlock_bh(&vxlan->hash_lock);
return err;
}
}
spin_unlock_bh(&vxlan->hash_lock);
}
if (data[IFLA_VXLAN_LOCAL]) {
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))
return -EPFNOSUPPORT;
/* TODO: respect scope id */
conf.saddr.sin6.sin6_addr = nla_get_in6_addr(data[IFLA_VXLAN_LOCAL6]);
conf.saddr.sa.sa_family = AF_INET6;
}
if (data[IFLA_VXLAN_LINK])
conf.remote_ifindex = nla_get_u32(data[IFLA_VXLAN_LINK]);
if (data[IFLA_VXLAN_TOS])
conf.tos = nla_get_u8(data[IFLA_VXLAN_TOS]);
if (data[IFLA_VXLAN_TTL])
conf.ttl = nla_get_u8(data[IFLA_VXLAN_TTL]);
if (data[IFLA_VXLAN_LABEL])
conf.label = nla_get_be32(data[IFLA_VXLAN_LABEL]) &
IPV6_FLOWLABEL_MASK;
if (!data[IFLA_VXLAN_LEARNING] || nla_get_u8(data[IFLA_VXLAN_LEARNING]))
conf.flags |= VXLAN_F_LEARN;
if (data[IFLA_VXLAN_AGEING])
conf.age_interval = nla_get_u32(data[IFLA_VXLAN_AGEING]);
if (data[IFLA_VXLAN_PROXY] && nla_get_u8(data[IFLA_VXLAN_PROXY]))
conf.flags |= VXLAN_F_PROXY;
if (data[IFLA_VXLAN_RSC] && nla_get_u8(data[IFLA_VXLAN_RSC]))
conf.flags |= VXLAN_F_RSC;
if (data[IFLA_VXLAN_L2MISS] && nla_get_u8(data[IFLA_VXLAN_L2MISS]))
conf.flags |= VXLAN_F_L2MISS;
if (data[IFLA_VXLAN_L3MISS] && nla_get_u8(data[IFLA_VXLAN_L3MISS]))
conf.flags |= VXLAN_F_L3MISS;
if (data[IFLA_VXLAN_LIMIT])
conf.addrmax = nla_get_u32(data[IFLA_VXLAN_LIMIT]);
if (data[IFLA_VXLAN_COLLECT_METADATA] &&
nla_get_u8(data[IFLA_VXLAN_COLLECT_METADATA]))
conf.flags |= VXLAN_F_COLLECT_METADATA;
if (data[IFLA_VXLAN_PORT_RANGE]) {
const struct ifla_vxlan_port_range *p
= nla_data(data[IFLA_VXLAN_PORT_RANGE]);
conf.port_min = ntohs(p->low);
conf.port_max = ntohs(p->high);
}
if (data[IFLA_VXLAN_PORT])
conf.dst_port = nla_get_be16(data[IFLA_VXLAN_PORT]);
if (data[IFLA_VXLAN_UDP_CSUM] &&
!nla_get_u8(data[IFLA_VXLAN_UDP_CSUM]))
conf.flags |= VXLAN_F_UDP_ZERO_CSUM_TX;
if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX] &&
nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_TX]))
conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
if (data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX] &&
nla_get_u8(data[IFLA_VXLAN_UDP_ZERO_CSUM6_RX]))
conf.flags |= VXLAN_F_UDP_ZERO_CSUM6_RX;
if (data[IFLA_VXLAN_REMCSUM_TX] &&
nla_get_u8(data[IFLA_VXLAN_REMCSUM_TX]))
conf.flags |= VXLAN_F_REMCSUM_TX;
if (data[IFLA_VXLAN_REMCSUM_RX] &&
nla_get_u8(data[IFLA_VXLAN_REMCSUM_RX]))
conf.flags |= VXLAN_F_REMCSUM_RX;
if (data[IFLA_VXLAN_GBP])
conf.flags |= VXLAN_F_GBP;
if (data[IFLA_VXLAN_GPE])
conf.flags |= VXLAN_F_GPE;
if (data[IFLA_VXLAN_REMCSUM_NOPARTIAL])
conf.flags |= VXLAN_F_REMCSUM_NOPARTIAL;
if (tb[IFLA_MTU])
conf.mtu = nla_get_u32(tb[IFLA_MTU]);
return vxlan_dev_configure(src_net, dev, &conf);
return 0;
}
static void vxlan_dellink(struct net_device *dev, struct list_head *head)
@ -3261,6 +3417,7 @@ static struct rtnl_link_ops vxlan_link_ops __read_mostly = {
.setup = vxlan_setup,
.validate = vxlan_validate,
.newlink = vxlan_newlink,
.changelink = vxlan_changelink,
.dellink = vxlan_dellink,
.get_size = vxlan_get_size,
.fill_info = vxlan_fill_info,
@ -3282,7 +3439,7 @@ struct net_device *vxlan_dev_create(struct net *net, const char *name,
if (IS_ERR(dev))
return dev;
err = vxlan_dev_configure(net, dev, conf);
err = vxlan_dev_configure(net, dev, conf, false);
if (err < 0) {
free_netdev(dev);
return ERR_PTR(err);