static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
struct net_device *dev,
+ struct geneve_sock *gs4,
struct flowi4 *fl4,
const struct ip_tunnel_info *info)
{
struct rtable *rt = NULL;
__u8 tos;
- if (!rcu_dereference(geneve->sock4))
+ if (!gs4)
return ERR_PTR(-EIO);
memset(fl4, 0, sizeof(*fl4));
#if IS_ENABLED(CONFIG_IPV6)
static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
struct net_device *dev,
+ struct geneve_sock *gs6,
struct flowi6 *fl6,
const struct ip_tunnel_info *info)
{
struct geneve_dev *geneve = netdev_priv(dev);
struct dst_entry *dst = NULL;
struct dst_cache *dst_cache;
- struct geneve_sock *gs6;
__u8 prio;
- gs6 = rcu_dereference(geneve->sock6);
if (!gs6)
return ERR_PTR(-EIO);
__be16 df;
int err;
- rt = geneve_get_v4_rt(skb, dev, &fl4, info);
+ rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info);
if (IS_ERR(rt))
return PTR_ERR(rt);
__be16 sport;
int err;
- dst = geneve_get_v6_dst(skb, dev, &fl6, info);
+ dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info);
if (IS_ERR(dst))
return PTR_ERR(dst);
if (ip_tunnel_info_af(info) == AF_INET) {
struct rtable *rt;
struct flowi4 fl4;
+ struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
- rt = geneve_get_v4_rt(skb, dev, &fl4, info);
+ rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info);
if (IS_ERR(rt))
return PTR_ERR(rt);
} else if (ip_tunnel_info_af(info) == AF_INET6) {
struct dst_entry *dst;
struct flowi6 fl6;
+ struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
- dst = geneve_get_v6_dst(skb, dev, &fl6, info);
+ dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info);
if (IS_ERR(dst))
return PTR_ERR(dst);
return true;
}
+static bool geneve_dst_addr_equal(struct ip_tunnel_info *a,
+ struct ip_tunnel_info *b)
+{
+ if (ip_tunnel_info_af(a) == AF_INET)
+ return a->key.u.ipv4.dst == b->key.u.ipv4.dst;
+ else
+ return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst);
+}
+
static int geneve_configure(struct net *net, struct net_device *dev,
const struct ip_tunnel_info *info,
bool metadata, bool ipv6_rx_csum)
info->key.tp_dst = htons(dst_port);
}
-static int geneve_newlink(struct net *net, struct net_device *dev,
- struct nlattr *tb[], struct nlattr *data[],
- struct netlink_ext_ack *extack)
+static int geneve_nl2info(struct net_device *dev, struct nlattr *tb[],
+ struct nlattr *data[], struct ip_tunnel_info *info,
+ bool *metadata, bool *use_udp6_rx_checksums,
+ bool changelink)
{
- bool use_udp6_rx_checksums = false;
- struct ip_tunnel_info info;
- bool metadata = false;
-
- init_tnl_info(&info, GENEVE_UDP_PORT);
-
if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6])
return -EINVAL;
if (data[IFLA_GENEVE_REMOTE]) {
- info.key.u.ipv4.dst =
+ if (changelink && (ip_tunnel_info_af(info) == AF_INET6))
+ return -EOPNOTSUPP;
+
+ info->key.u.ipv4.dst =
nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
- if (IN_MULTICAST(ntohl(info.key.u.ipv4.dst))) {
+ if (IN_MULTICAST(ntohl(info->key.u.ipv4.dst))) {
netdev_dbg(dev, "multicast remote is unsupported\n");
return -EINVAL;
}
if (data[IFLA_GENEVE_REMOTE6]) {
#if IS_ENABLED(CONFIG_IPV6)
- info.mode = IP_TUNNEL_INFO_IPV6;
- info.key.u.ipv6.dst =
+ if (changelink && (ip_tunnel_info_af(info) == AF_INET))
+ return -EOPNOTSUPP;
+
+ info->mode = IP_TUNNEL_INFO_IPV6;
+ info->key.u.ipv6.dst =
nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
- if (ipv6_addr_type(&info.key.u.ipv6.dst) &
+ if (ipv6_addr_type(&info->key.u.ipv6.dst) &
IPV6_ADDR_LINKLOCAL) {
netdev_dbg(dev, "link-local remote is unsupported\n");
return -EINVAL;
}
- if (ipv6_addr_is_multicast(&info.key.u.ipv6.dst)) {
+ if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) {
netdev_dbg(dev, "multicast remote is unsupported\n");
return -EINVAL;
}
- info.key.tun_flags |= TUNNEL_CSUM;
- use_udp6_rx_checksums = true;
+ info->key.tun_flags |= TUNNEL_CSUM;
+ *use_udp6_rx_checksums = true;
#else
return -EPFNOSUPPORT;
#endif
if (data[IFLA_GENEVE_ID]) {
__u32 vni;
__u8 tvni[3];
+ __be64 tunid;
vni = nla_get_u32(data[IFLA_GENEVE_ID]);
tvni[0] = (vni & 0x00ff0000) >> 16;
tvni[1] = (vni & 0x0000ff00) >> 8;
tvni[2] = vni & 0x000000ff;
- info.key.tun_id = vni_to_tunnel_id(tvni);
+ tunid = vni_to_tunnel_id(tvni);
+ if (changelink && (tunid != info->key.tun_id))
+ return -EOPNOTSUPP;
+ info->key.tun_id = tunid;
}
+
if (data[IFLA_GENEVE_TTL])
- info.key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
+ info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
if (data[IFLA_GENEVE_TOS])
- info.key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
+ info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
if (data[IFLA_GENEVE_LABEL]) {
- info.key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
+ info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
IPV6_FLOWLABEL_MASK;
- if (info.key.label && (!(info.mode & IP_TUNNEL_INFO_IPV6)))
+ if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6)))
return -EINVAL;
}
- if (data[IFLA_GENEVE_PORT])
- info.key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]);
+ if (data[IFLA_GENEVE_PORT]) {
+ if (changelink)
+ return -EOPNOTSUPP;
+ info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]);
+ }
- if (data[IFLA_GENEVE_COLLECT_METADATA])
- metadata = true;
+ if (data[IFLA_GENEVE_COLLECT_METADATA]) {
+ if (changelink)
+ return -EOPNOTSUPP;
+ *metadata = true;
+ }
- if (data[IFLA_GENEVE_UDP_CSUM] &&
- nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
- info.key.tun_flags |= TUNNEL_CSUM;
+ if (data[IFLA_GENEVE_UDP_CSUM]) {
+ if (changelink)
+ return -EOPNOTSUPP;
+ if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
+ info->key.tun_flags |= TUNNEL_CSUM;
+ }
- if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX] &&
- nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
- info.key.tun_flags &= ~TUNNEL_CSUM;
+ if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
+ if (changelink)
+ return -EOPNOTSUPP;
+ if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
+ info->key.tun_flags &= ~TUNNEL_CSUM;
+ }
- if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX] &&
- nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
- use_udp6_rx_checksums = false;
+ if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
+ if (changelink)
+ return -EOPNOTSUPP;
+ if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
+ *use_udp6_rx_checksums = false;
+ }
+
+ return 0;
+}
+
+static int geneve_newlink(struct net *net, struct net_device *dev,
+ struct nlattr *tb[], struct nlattr *data[],
+ struct netlink_ext_ack *extack)
+{
+ bool use_udp6_rx_checksums = false;
+ struct ip_tunnel_info info;
+ bool metadata = false;
+ int err;
+
+ init_tnl_info(&info, GENEVE_UDP_PORT);
+ err = geneve_nl2info(dev, tb, data, &info, &metadata,
+ &use_udp6_rx_checksums, false);
+ if (err)
+ return err;
return geneve_configure(net, dev, &info, metadata, use_udp6_rx_checksums);
}
+/* Quiesces the geneve device data path for both TX and RX.
+ *
+ * On transmit geneve checks for non-NULL geneve_sock before it proceeds.
+ * So, if we set that socket to NULL under RCU and wait for synchronize_net()
+ * to complete for the existing set of in-flight packets to be transmitted,
+ * then we would have quiesced the transmit data path. All the future packets
+ * will get dropped until we unquiesce the data path.
+ *
+ * On receive geneve dereference the geneve_sock stashed in the socket. So,
+ * if we set that to NULL under RCU and wait for synchronize_net() to
+ * complete, then we would have quiesced the receive data path.
+ */
+static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4,
+ struct geneve_sock **gs6)
+{
+ *gs4 = rtnl_dereference(geneve->sock4);
+ rcu_assign_pointer(geneve->sock4, NULL);
+ if (*gs4)
+ rcu_assign_sk_user_data((*gs4)->sock->sk, NULL);
+#if IS_ENABLED(CONFIG_IPV6)
+ *gs6 = rtnl_dereference(geneve->sock6);
+ rcu_assign_pointer(geneve->sock6, NULL);
+ if (*gs6)
+ rcu_assign_sk_user_data((*gs6)->sock->sk, NULL);
+#else
+ *gs6 = NULL;
+#endif
+ synchronize_net();
+}
+
+/* Resumes the geneve device data path for both TX and RX. */
+static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4,
+ struct geneve_sock __maybe_unused *gs6)
+{
+ rcu_assign_pointer(geneve->sock4, gs4);
+ if (gs4)
+ rcu_assign_sk_user_data(gs4->sock->sk, gs4);
+#if IS_ENABLED(CONFIG_IPV6)
+ rcu_assign_pointer(geneve->sock6, gs6);
+ if (gs6)
+ rcu_assign_sk_user_data(gs6->sock->sk, gs6);
+#endif
+ synchronize_net();
+}
+
+static int geneve_changelink(struct net_device *dev, struct nlattr *tb[],
+ struct nlattr *data[],
+ struct netlink_ext_ack *extack)
+{
+ struct geneve_dev *geneve = netdev_priv(dev);
+ struct geneve_sock *gs4, *gs6;
+ struct ip_tunnel_info info;
+ bool metadata;
+ bool use_udp6_rx_checksums;
+ int err;
+
+ /* If the geneve device is configured for metadata (or externally
+ * controlled, for example, OVS), then nothing can be changed.
+ */
+ if (geneve->collect_md)
+ return -EOPNOTSUPP;
+
+ /* Start with the existing info. */
+ memcpy(&info, &geneve->info, sizeof(info));
+ metadata = geneve->collect_md;
+ use_udp6_rx_checksums = geneve->use_udp6_rx_checksums;
+ err = geneve_nl2info(dev, tb, data, &info, &metadata,
+ &use_udp6_rx_checksums, true);
+ if (err)
+ return err;
+
+ if (!geneve_dst_addr_equal(&geneve->info, &info))
+ dst_cache_reset(&info.dst_cache);
+
+ geneve_quiesce(geneve, &gs4, &gs6);
+ geneve->info = info;
+ geneve->collect_md = metadata;
+ geneve->use_udp6_rx_checksums = use_udp6_rx_checksums;
+ geneve_unquiesce(geneve, gs4, gs6);
+
+ return 0;
+}
+
static void geneve_dellink(struct net_device *dev, struct list_head *head)
{
struct geneve_dev *geneve = netdev_priv(dev);
.setup = geneve_setup,
.validate = geneve_validate,
.newlink = geneve_newlink,
+ .changelink = geneve_changelink,
.dellink = geneve_dellink,
.get_size = geneve_get_size,
.fill_info = geneve_fill_info,
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