aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorMatthias Schiffer <mschiffer@universe-factory.net>2017-06-19 10:03:55 +0200
committerDavid S. Miller <davem@davemloft.net>2017-06-20 13:37:01 -0400
commita985343ba90635cda3f3704f71021254c91cebbd (patch)
tree6b409f87fb8a1602d88a75187a467a7ee4d07cfe
parentMerge branch 'net-more-skb_put-work' (diff)
downloadlinux-dev-a985343ba90635cda3f3704f71021254c91cebbd.tar.xz
linux-dev-a985343ba90635cda3f3704f71021254c91cebbd.zip
vxlan: refactor verification and application of configuration
The vxlan_dev_configure function was mixing validation and application of the vxlan configuration; this could easily lead to bugs with the changelink operation, as it was hard to see if the function wcould return an error after parts of the configuration had already been applied. This commit splits validation and application out of vxlan_dev_configure as separate functions to make it clearer where error returns are allowed and where the vxlan_dev or net_device may be configured. Log messages in these functions are removed, as it is generally unexpected to find error output for netlink requests in the kernel log. Userspace should be able to handle errors based on the error codes returned via netlink just fine. In addition, some validation and initialization is moved to vxlan_validate and vxlan_setup respectively to improve grouping of similar settings. Finally, this also fixes two actual bugs: * if set, conf->mtu would overwrite dev->mtu in each changelink operation, reverting other changes of dev->mtu * the "if (!conf->dst_port)" branch would never be run, as conf->dst_port was set in vxlan_setup before. This caused VXLAN-GPE to use the same default port as other VXLAN sockets instead of the intended IANA-assigned 4790. Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/vxlan.c208
1 files changed, 111 insertions, 97 deletions
diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 94ce98229828..9139f15a2ec1 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -2623,6 +2623,10 @@ static void vxlan_setup(struct net_device *dev)
netif_keep_dst(dev);
dev->priv_flags |= IFF_NO_QUEUE;
+ /* MTU range: 68 - 65535 */
+ dev->min_mtu = ETH_MIN_MTU;
+ dev->max_mtu = ETH_MAX_MTU;
+
INIT_LIST_HEAD(&vxlan->next);
spin_lock_init(&vxlan->hash_lock);
@@ -2630,9 +2634,8 @@ static void vxlan_setup(struct net_device *dev)
vxlan->age_timer.function = vxlan_cleanup;
vxlan->age_timer.data = (unsigned long) vxlan;
- vxlan->cfg.dst_port = htons(vxlan_port);
-
vxlan->dev = dev;
+ vxlan->net = dev_net(dev);
gro_cells_init(&vxlan->gro_cells, dev);
@@ -2701,11 +2704,19 @@ static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
}
}
+ if (tb[IFLA_MTU]) {
+ u32 mtu = nla_get_u32(data[IFLA_MTU]);
+
+ if (mtu < ETH_MIN_MTU || mtu > ETH_MAX_MTU)
+ return -EINVAL;
+ }
+
if (!data)
return -EINVAL;
if (data[IFLA_VXLAN_ID]) {
- __u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
+ u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
+
if (id >= VXLAN_N_VID)
return -ERANGE;
}
@@ -2866,116 +2877,128 @@ static int vxlan_sock_add(struct vxlan_dev *vxlan)
return ret;
}
-static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
- struct vxlan_config *conf,
- bool changelink)
+static int vxlan_config_validate(struct net *src_net, struct vxlan_config *conf,
+ struct net_device **lower,
+ struct vxlan_dev *old)
{
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;
+ struct vxlan_dev *tmp;
bool use_ipv6 = false;
- __be16 default_port = vxlan->cfg.dst_port;
- struct net_device *lowerdev = NULL;
- 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);
+ 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)) {
+ return -EINVAL;
}
-
- /* 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));
-
- /* Unless IPv6 is explicitly requested, assume IPv4 */
- if (!dst->remote_ip.sa.sa_family)
- dst->remote_ip.sa.sa_family = AF_INET;
+ if (!conf->remote_ip.sa.sa_family)
+ conf->remote_ip.sa.sa_family = AF_INET;
- if (dst->remote_ip.sa.sa_family == AF_INET6 ||
- vxlan->cfg.saddr.sa.sa_family == AF_INET6) {
+ if (conf->remote_ip.sa.sa_family == AF_INET6 ||
+ conf->saddr.sa.sa_family == AF_INET6) {
if (!IS_ENABLED(CONFIG_IPV6))
return -EPFNOSUPPORT;
use_ipv6 = true;
- vxlan->flags |= VXLAN_F_IPV6;
+ conf->flags |= VXLAN_F_IPV6;
}
- if (conf->label && !use_ipv6) {
- pr_info("label only supported in use with IPv6\n");
+ if (conf->label && !use_ipv6)
return -EINVAL;
- }
- 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 (conf->remote_ifindex) {
+ struct net_device *lowerdev;
- if (!lowerdev) {
- pr_info("ifindex %d does not exist\n",
- dst->remote_ifindex);
+ lowerdev = __dev_get_by_index(src_net, conf->remote_ifindex);
+ if (!lowerdev)
return -ENODEV;
- }
#if IS_ENABLED(CONFIG_IPV6)
if (use_ipv6) {
struct inet6_dev *idev = __in6_dev_get(lowerdev);
- if (idev && idev->cnf.disable_ipv6) {
- pr_info("IPv6 is disabled via sysctl\n");
+ if (idev && idev->cnf.disable_ipv6)
return -EPERM;
- }
}
#endif
- if (!conf->mtu)
- dev->mtu = lowerdev->mtu -
- (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
+ *lower = lowerdev;
+ } else {
+ if (vxlan_addr_multicast(&conf->remote_ip))
+ return -EINVAL;
- needed_headroom = lowerdev->hard_header_len;
- } else if (!conf->remote_ifindex &&
- vxlan_addr_multicast(&dst->remote_ip)) {
- pr_info("multicast destination requires interface to be specified\n");
- return -EINVAL;
+ *lower = NULL;
}
- if (lowerdev) {
- dev->gso_max_size = lowerdev->gso_max_size;
- dev->gso_max_segs = lowerdev->gso_max_segs;
+ if (!conf->dst_port) {
+ if (conf->flags & VXLAN_F_GPE)
+ conf->dst_port = htons(4790); /* IANA VXLAN-GPE port */
+ else
+ conf->dst_port = htons(vxlan_port);
}
- if (conf->mtu) {
- int max_mtu = ETH_MAX_MTU;
+ if (!conf->age_interval)
+ conf->age_interval = FDB_AGE_DEFAULT;
- if (lowerdev)
- max_mtu = lowerdev->mtu;
+ list_for_each_entry(tmp, &vn->vxlan_list, next) {
+ if (tmp == old)
+ continue;
- max_mtu -= (use_ipv6 ? VXLAN6_HEADROOM : VXLAN_HEADROOM);
+ if (tmp->cfg.vni == conf->vni &&
+ (tmp->default_dst.remote_ip.sa.sa_family == AF_INET6 ||
+ tmp->cfg.saddr.sa.sa_family == AF_INET6) == use_ipv6 &&
+ tmp->cfg.dst_port == conf->dst_port &&
+ (tmp->flags & VXLAN_F_RCV_FLAGS) ==
+ (conf->flags & VXLAN_F_RCV_FLAGS))
+ return -EEXIST;
+ }
- if (conf->mtu < dev->min_mtu || conf->mtu > dev->max_mtu)
- return -EINVAL;
+ return 0;
+}
- dev->mtu = conf->mtu;
+static void vxlan_config_apply(struct net_device *dev,
+ struct vxlan_config *conf,
+ struct net_device *lowerdev, bool changelink)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ struct vxlan_rdst *dst = &vxlan->default_dst;
+ unsigned short needed_headroom = ETH_HLEN;
+ bool use_ipv6 = !!(conf->flags & VXLAN_F_IPV6);
+ int max_mtu = ETH_MAX_MTU;
+
+ if (!changelink) {
+ if (conf->flags & VXLAN_F_GPE)
+ vxlan_raw_setup(dev);
+ else
+ vxlan_ether_setup(dev);
- if (conf->mtu > max_mtu)
- dev->mtu = max_mtu;
+ if (conf->mtu)
+ dev->mtu = conf->mtu;
}
+ dst->remote_vni = conf->vni;
+
+ memcpy(&dst->remote_ip, &conf->remote_ip, sizeof(conf->remote_ip));
+
+ if (lowerdev) {
+ dst->remote_ifindex = conf->remote_ifindex;
+
+ dev->gso_max_size = lowerdev->gso_max_size;
+ dev->gso_max_segs = lowerdev->gso_max_segs;
+
+ needed_headroom = lowerdev->hard_header_len;
+
+ max_mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM :
+ VXLAN_HEADROOM);
+ }
+
+ if (dev->mtu > max_mtu)
+ dev->mtu = max_mtu;
+
if (use_ipv6 || conf->flags & VXLAN_F_COLLECT_METADATA)
needed_headroom += VXLAN6_HEADROOM;
else
@@ -2983,31 +3006,22 @@ 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) {
- if (conf->flags & VXLAN_F_GPE)
- vxlan->cfg.dst_port = htons(4790); /* IANA VXLAN-GPE port */
- else
- vxlan->cfg.dst_port = default_port;
- }
vxlan->flags |= conf->flags;
+}
- if (!vxlan->cfg.age_interval)
- vxlan->cfg.age_interval = FDB_AGE_DEFAULT;
+static int vxlan_dev_configure(struct net *src_net, struct net_device *dev,
+ struct vxlan_config *conf,
+ bool changelink)
+{
+ struct vxlan_dev *vxlan = netdev_priv(dev);
+ struct net_device *lowerdev;
+ int ret;
- if (changelink)
- return 0;
+ ret = vxlan_config_validate(src_net, conf, &lowerdev, vxlan);
+ if (ret)
+ return ret;
- 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 ||
- tmp->cfg.saddr.sa.sa_family == AF_INET6) == use_ipv6 &&
- tmp->cfg.dst_port == vxlan->cfg.dst_port &&
- (tmp->flags & VXLAN_F_RCV_FLAGS) ==
- (vxlan->flags & VXLAN_F_RCV_FLAGS)) {
- pr_info("duplicate VNI %u\n", be32_to_cpu(conf->vni));
- return -EEXIST;
- }
- }
+ vxlan_config_apply(dev, conf, lowerdev, changelink);
return 0;
}