| /* |
| * Copyright (c) 2007-2014 Nicira, Inc. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of version 2 of the GNU General Public |
| * License as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| * 02110-1301, USA |
| */ |
| |
| #include <linux/etherdevice.h> |
| #include <linux/if.h> |
| #include <linux/if_vlan.h> |
| #include <linux/jhash.h> |
| #include <linux/kernel.h> |
| #include <linux/list.h> |
| #include <linux/mutex.h> |
| #include <linux/percpu.h> |
| #include <linux/rcupdate.h> |
| #include <linux/rtnetlink.h> |
| #include <linux/compat.h> |
| #include <net/net_namespace.h> |
| #include <linux/module.h> |
| |
| #include "datapath.h" |
| #include "vport.h" |
| #include "vport-internal_dev.h" |
| |
| static LIST_HEAD(vport_ops_list); |
| |
| /* Protected by RCU read lock for reading, ovs_mutex for writing. */ |
| static struct hlist_head *dev_table; |
| #define VPORT_HASH_BUCKETS 1024 |
| |
| /** |
| * ovs_vport_init - initialize vport subsystem |
| * |
| * Called at module load time to initialize the vport subsystem. |
| */ |
| int ovs_vport_init(void) |
| { |
| dev_table = kzalloc(VPORT_HASH_BUCKETS * sizeof(struct hlist_head), |
| GFP_KERNEL); |
| if (!dev_table) |
| return -ENOMEM; |
| |
| return 0; |
| } |
| |
| /** |
| * ovs_vport_exit - shutdown vport subsystem |
| * |
| * Called at module exit time to shutdown the vport subsystem. |
| */ |
| void ovs_vport_exit(void) |
| { |
| kfree(dev_table); |
| } |
| |
| static struct hlist_head *hash_bucket(const struct net *net, const char *name) |
| { |
| unsigned int hash = jhash(name, strlen(name), (unsigned long) net); |
| return &dev_table[hash & (VPORT_HASH_BUCKETS - 1)]; |
| } |
| |
| int __ovs_vport_ops_register(struct vport_ops *ops) |
| { |
| int err = -EEXIST; |
| struct vport_ops *o; |
| |
| ovs_lock(); |
| list_for_each_entry(o, &vport_ops_list, list) |
| if (ops->type == o->type) |
| goto errout; |
| |
| list_add_tail(&ops->list, &vport_ops_list); |
| err = 0; |
| errout: |
| ovs_unlock(); |
| return err; |
| } |
| EXPORT_SYMBOL_GPL(__ovs_vport_ops_register); |
| |
| void ovs_vport_ops_unregister(struct vport_ops *ops) |
| { |
| ovs_lock(); |
| list_del(&ops->list); |
| ovs_unlock(); |
| } |
| EXPORT_SYMBOL_GPL(ovs_vport_ops_unregister); |
| |
| /** |
| * ovs_vport_locate - find a port that has already been created |
| * |
| * @name: name of port to find |
| * |
| * Must be called with ovs or RCU read lock. |
| */ |
| struct vport *ovs_vport_locate(const struct net *net, const char *name) |
| { |
| struct hlist_head *bucket = hash_bucket(net, name); |
| struct vport *vport; |
| |
| hlist_for_each_entry_rcu(vport, bucket, hash_node) |
| if (!strcmp(name, ovs_vport_name(vport)) && |
| net_eq(ovs_dp_get_net(vport->dp), net)) |
| return vport; |
| |
| return NULL; |
| } |
| |
| /** |
| * ovs_vport_alloc - allocate and initialize new vport |
| * |
| * @priv_size: Size of private data area to allocate. |
| * @ops: vport device ops |
| * |
| * Allocate and initialize a new vport defined by @ops. The vport will contain |
| * a private data area of size @priv_size that can be accessed using |
| * vport_priv(). vports that are no longer needed should be released with |
| * vport_free(). |
| */ |
| struct vport *ovs_vport_alloc(int priv_size, const struct vport_ops *ops, |
| const struct vport_parms *parms) |
| { |
| struct vport *vport; |
| size_t alloc_size; |
| |
| alloc_size = sizeof(struct vport); |
| if (priv_size) { |
| alloc_size = ALIGN(alloc_size, VPORT_ALIGN); |
| alloc_size += priv_size; |
| } |
| |
| vport = kzalloc(alloc_size, GFP_KERNEL); |
| if (!vport) |
| return ERR_PTR(-ENOMEM); |
| |
| vport->dp = parms->dp; |
| vport->port_no = parms->port_no; |
| vport->ops = ops; |
| INIT_HLIST_NODE(&vport->dp_hash_node); |
| |
| if (ovs_vport_set_upcall_portids(vport, parms->upcall_portids)) { |
| kfree(vport); |
| return ERR_PTR(-EINVAL); |
| } |
| |
| return vport; |
| } |
| EXPORT_SYMBOL_GPL(ovs_vport_alloc); |
| |
| /** |
| * ovs_vport_free - uninitialize and free vport |
| * |
| * @vport: vport to free |
| * |
| * Frees a vport allocated with vport_alloc() when it is no longer needed. |
| * |
| * The caller must ensure that an RCU grace period has passed since the last |
| * time @vport was in a datapath. |
| */ |
| void ovs_vport_free(struct vport *vport) |
| { |
| /* vport is freed from RCU callback or error path, Therefore |
| * it is safe to use raw dereference. |
| */ |
| kfree(rcu_dereference_raw(vport->upcall_portids)); |
| kfree(vport); |
| } |
| EXPORT_SYMBOL_GPL(ovs_vport_free); |
| |
| static struct vport_ops *ovs_vport_lookup(const struct vport_parms *parms) |
| { |
| struct vport_ops *ops; |
| |
| list_for_each_entry(ops, &vport_ops_list, list) |
| if (ops->type == parms->type) |
| return ops; |
| |
| return NULL; |
| } |
| |
| /** |
| * ovs_vport_add - add vport device (for kernel callers) |
| * |
| * @parms: Information about new vport. |
| * |
| * Creates a new vport with the specified configuration (which is dependent on |
| * device type). ovs_mutex must be held. |
| */ |
| struct vport *ovs_vport_add(const struct vport_parms *parms) |
| { |
| struct vport_ops *ops; |
| struct vport *vport; |
| |
| ops = ovs_vport_lookup(parms); |
| if (ops) { |
| struct hlist_head *bucket; |
| |
| if (!try_module_get(ops->owner)) |
| return ERR_PTR(-EAFNOSUPPORT); |
| |
| vport = ops->create(parms); |
| if (IS_ERR(vport)) { |
| module_put(ops->owner); |
| return vport; |
| } |
| |
| bucket = hash_bucket(ovs_dp_get_net(vport->dp), |
| ovs_vport_name(vport)); |
| hlist_add_head_rcu(&vport->hash_node, bucket); |
| return vport; |
| } |
| |
| /* Unlock to attempt module load and return -EAGAIN if load |
| * was successful as we need to restart the port addition |
| * workflow. |
| */ |
| ovs_unlock(); |
| request_module("vport-type-%d", parms->type); |
| ovs_lock(); |
| |
| if (!ovs_vport_lookup(parms)) |
| return ERR_PTR(-EAFNOSUPPORT); |
| else |
| return ERR_PTR(-EAGAIN); |
| } |
| |
| /** |
| * ovs_vport_set_options - modify existing vport device (for kernel callers) |
| * |
| * @vport: vport to modify. |
| * @options: New configuration. |
| * |
| * Modifies an existing device with the specified configuration (which is |
| * dependent on device type). ovs_mutex must be held. |
| */ |
| int ovs_vport_set_options(struct vport *vport, struct nlattr *options) |
| { |
| if (!vport->ops->set_options) |
| return -EOPNOTSUPP; |
| return vport->ops->set_options(vport, options); |
| } |
| |
| /** |
| * ovs_vport_del - delete existing vport device |
| * |
| * @vport: vport to delete. |
| * |
| * Detaches @vport from its datapath and destroys it. ovs_mutex must |
| * be held. |
| */ |
| void ovs_vport_del(struct vport *vport) |
| { |
| ASSERT_OVSL(); |
| |
| hlist_del_rcu(&vport->hash_node); |
| module_put(vport->ops->owner); |
| vport->ops->destroy(vport); |
| } |
| |
| /** |
| * ovs_vport_get_stats - retrieve device stats |
| * |
| * @vport: vport from which to retrieve the stats |
| * @stats: location to store stats |
| * |
| * Retrieves transmit, receive, and error stats for the given device. |
| * |
| * Must be called with ovs_mutex or rcu_read_lock. |
| */ |
| void ovs_vport_get_stats(struct vport *vport, struct ovs_vport_stats *stats) |
| { |
| const struct rtnl_link_stats64 *dev_stats; |
| struct rtnl_link_stats64 temp; |
| |
| dev_stats = dev_get_stats(vport->dev, &temp); |
| stats->rx_errors = dev_stats->rx_errors; |
| stats->tx_errors = dev_stats->tx_errors; |
| stats->tx_dropped = dev_stats->tx_dropped; |
| stats->rx_dropped = dev_stats->rx_dropped; |
| |
| stats->rx_bytes = dev_stats->rx_bytes; |
| stats->rx_packets = dev_stats->rx_packets; |
| stats->tx_bytes = dev_stats->tx_bytes; |
| stats->tx_packets = dev_stats->tx_packets; |
| } |
| |
| /** |
| * ovs_vport_get_options - retrieve device options |
| * |
| * @vport: vport from which to retrieve the options. |
| * @skb: sk_buff where options should be appended. |
| * |
| * Retrieves the configuration of the given device, appending an |
| * %OVS_VPORT_ATTR_OPTIONS attribute that in turn contains nested |
| * vport-specific attributes to @skb. |
| * |
| * Returns 0 if successful, -EMSGSIZE if @skb has insufficient room, or another |
| * negative error code if a real error occurred. If an error occurs, @skb is |
| * left unmodified. |
| * |
| * Must be called with ovs_mutex or rcu_read_lock. |
| */ |
| int ovs_vport_get_options(const struct vport *vport, struct sk_buff *skb) |
| { |
| struct nlattr *nla; |
| int err; |
| |
| if (!vport->ops->get_options) |
| return 0; |
| |
| nla = nla_nest_start(skb, OVS_VPORT_ATTR_OPTIONS); |
| if (!nla) |
| return -EMSGSIZE; |
| |
| err = vport->ops->get_options(vport, skb); |
| if (err) { |
| nla_nest_cancel(skb, nla); |
| return err; |
| } |
| |
| nla_nest_end(skb, nla); |
| return 0; |
| } |
| |
| /** |
| * ovs_vport_set_upcall_portids - set upcall portids of @vport. |
| * |
| * @vport: vport to modify. |
| * @ids: new configuration, an array of port ids. |
| * |
| * Sets the vport's upcall_portids to @ids. |
| * |
| * Returns 0 if successful, -EINVAL if @ids is zero length or cannot be parsed |
| * as an array of U32. |
| * |
| * Must be called with ovs_mutex. |
| */ |
| int ovs_vport_set_upcall_portids(struct vport *vport, const struct nlattr *ids) |
| { |
| struct vport_portids *old, *vport_portids; |
| |
| if (!nla_len(ids) || nla_len(ids) % sizeof(u32)) |
| return -EINVAL; |
| |
| old = ovsl_dereference(vport->upcall_portids); |
| |
| vport_portids = kmalloc(sizeof(*vport_portids) + nla_len(ids), |
| GFP_KERNEL); |
| if (!vport_portids) |
| return -ENOMEM; |
| |
| vport_portids->n_ids = nla_len(ids) / sizeof(u32); |
| vport_portids->rn_ids = reciprocal_value(vport_portids->n_ids); |
| nla_memcpy(vport_portids->ids, ids, nla_len(ids)); |
| |
| rcu_assign_pointer(vport->upcall_portids, vport_portids); |
| |
| if (old) |
| kfree_rcu(old, rcu); |
| return 0; |
| } |
| |
| /** |
| * ovs_vport_get_upcall_portids - get the upcall_portids of @vport. |
| * |
| * @vport: vport from which to retrieve the portids. |
| * @skb: sk_buff where portids should be appended. |
| * |
| * Retrieves the configuration of the given vport, appending the |
| * %OVS_VPORT_ATTR_UPCALL_PID attribute which is the array of upcall |
| * portids to @skb. |
| * |
| * Returns 0 if successful, -EMSGSIZE if @skb has insufficient room. |
| * If an error occurs, @skb is left unmodified. Must be called with |
| * ovs_mutex or rcu_read_lock. |
| */ |
| int ovs_vport_get_upcall_portids(const struct vport *vport, |
| struct sk_buff *skb) |
| { |
| struct vport_portids *ids; |
| |
| ids = rcu_dereference_ovsl(vport->upcall_portids); |
| |
| if (vport->dp->user_features & OVS_DP_F_VPORT_PIDS) |
| return nla_put(skb, OVS_VPORT_ATTR_UPCALL_PID, |
| ids->n_ids * sizeof(u32), (void *)ids->ids); |
| else |
| return nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, ids->ids[0]); |
| } |
| |
| /** |
| * ovs_vport_find_upcall_portid - find the upcall portid to send upcall. |
| * |
| * @vport: vport from which the missed packet is received. |
| * @skb: skb that the missed packet was received. |
| * |
| * Uses the skb_get_hash() to select the upcall portid to send the |
| * upcall. |
| * |
| * Returns the portid of the target socket. Must be called with rcu_read_lock. |
| */ |
| u32 ovs_vport_find_upcall_portid(const struct vport *vport, struct sk_buff *skb) |
| { |
| struct vport_portids *ids; |
| u32 ids_index; |
| u32 hash; |
| |
| ids = rcu_dereference(vport->upcall_portids); |
| |
| if (ids->n_ids == 1 && ids->ids[0] == 0) |
| return 0; |
| |
| hash = skb_get_hash(skb); |
| ids_index = hash - ids->n_ids * reciprocal_divide(hash, ids->rn_ids); |
| return ids->ids[ids_index]; |
| } |
| |
| /** |
| * ovs_vport_receive - pass up received packet to the datapath for processing |
| * |
| * @vport: vport that received the packet |
| * @skb: skb that was received |
| * @tun_key: tunnel (if any) that carried packet |
| * |
| * Must be called with rcu_read_lock. The packet cannot be shared and |
| * skb->data should point to the Ethernet header. |
| */ |
| int ovs_vport_receive(struct vport *vport, struct sk_buff *skb, |
| const struct ip_tunnel_info *tun_info) |
| { |
| struct sw_flow_key key; |
| int error; |
| |
| OVS_CB(skb)->input_vport = vport; |
| OVS_CB(skb)->mru = 0; |
| OVS_CB(skb)->cutlen = 0; |
| if (unlikely(dev_net(skb->dev) != ovs_dp_get_net(vport->dp))) { |
| u32 mark; |
| |
| mark = skb->mark; |
| skb_scrub_packet(skb, true); |
| skb->mark = mark; |
| tun_info = NULL; |
| } |
| |
| /* Extract flow from 'skb' into 'key'. */ |
| error = ovs_flow_key_extract(tun_info, skb, &key); |
| if (unlikely(error)) { |
| kfree_skb(skb); |
| return error; |
| } |
| ovs_dp_process_packet(skb, &key); |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(ovs_vport_receive); |
| |
| static void free_vport_rcu(struct rcu_head *rcu) |
| { |
| struct vport *vport = container_of(rcu, struct vport, rcu); |
| |
| ovs_vport_free(vport); |
| } |
| |
| void ovs_vport_deferred_free(struct vport *vport) |
| { |
| if (!vport) |
| return; |
| |
| call_rcu(&vport->rcu, free_vport_rcu); |
| } |
| EXPORT_SYMBOL_GPL(ovs_vport_deferred_free); |
| |
| static unsigned int packet_length(const struct sk_buff *skb) |
| { |
| unsigned int length = skb->len - ETH_HLEN; |
| |
| if (skb->protocol == htons(ETH_P_8021Q)) |
| length -= VLAN_HLEN; |
| |
| return length; |
| } |
| |
| void ovs_vport_send(struct vport *vport, struct sk_buff *skb) |
| { |
| int mtu = vport->dev->mtu; |
| |
| if (unlikely(packet_length(skb) > mtu && !skb_is_gso(skb))) { |
| net_warn_ratelimited("%s: dropped over-mtu packet: %d > %d\n", |
| vport->dev->name, |
| packet_length(skb), mtu); |
| vport->dev->stats.tx_errors++; |
| goto drop; |
| } |
| |
| skb->dev = vport->dev; |
| vport->ops->send(skb); |
| return; |
| |
| drop: |
| kfree_skb(skb); |
| } |