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512 lines
12 KiB
512 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (c) 2007-2014 Nicira, Inc. |
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*/ |
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#include <linux/etherdevice.h> |
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#include <linux/if.h> |
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#include <linux/if_vlan.h> |
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#include <linux/jhash.h> |
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#include <linux/kernel.h> |
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#include <linux/list.h> |
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#include <linux/mutex.h> |
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#include <linux/percpu.h> |
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#include <linux/rcupdate.h> |
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#include <linux/rtnetlink.h> |
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#include <linux/compat.h> |
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#include <net/net_namespace.h> |
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#include <linux/module.h> |
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#include "datapath.h" |
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#include "vport.h" |
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#include "vport-internal_dev.h" |
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static LIST_HEAD(vport_ops_list); |
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/* Protected by RCU read lock for reading, ovs_mutex for writing. */ |
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static struct hlist_head *dev_table; |
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#define VPORT_HASH_BUCKETS 1024 |
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/** |
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* ovs_vport_init - initialize vport subsystem |
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* |
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* Called at module load time to initialize the vport subsystem. |
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*/ |
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int ovs_vport_init(void) |
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{ |
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dev_table = kcalloc(VPORT_HASH_BUCKETS, sizeof(struct hlist_head), |
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GFP_KERNEL); |
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if (!dev_table) |
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return -ENOMEM; |
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return 0; |
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} |
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/** |
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* ovs_vport_exit - shutdown vport subsystem |
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* |
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* Called at module exit time to shutdown the vport subsystem. |
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*/ |
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void ovs_vport_exit(void) |
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{ |
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kfree(dev_table); |
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} |
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static struct hlist_head *hash_bucket(const struct net *net, const char *name) |
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{ |
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unsigned int hash = jhash(name, strlen(name), (unsigned long) net); |
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return &dev_table[hash & (VPORT_HASH_BUCKETS - 1)]; |
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} |
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int __ovs_vport_ops_register(struct vport_ops *ops) |
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{ |
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int err = -EEXIST; |
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struct vport_ops *o; |
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ovs_lock(); |
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list_for_each_entry(o, &vport_ops_list, list) |
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if (ops->type == o->type) |
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goto errout; |
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list_add_tail(&ops->list, &vport_ops_list); |
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err = 0; |
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errout: |
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ovs_unlock(); |
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return err; |
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} |
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EXPORT_SYMBOL_GPL(__ovs_vport_ops_register); |
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void ovs_vport_ops_unregister(struct vport_ops *ops) |
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{ |
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ovs_lock(); |
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list_del(&ops->list); |
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ovs_unlock(); |
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} |
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EXPORT_SYMBOL_GPL(ovs_vport_ops_unregister); |
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/** |
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* ovs_vport_locate - find a port that has already been created |
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* |
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* @net: network namespace |
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* @name: name of port to find |
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* |
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* Must be called with ovs or RCU read lock. |
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*/ |
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struct vport *ovs_vport_locate(const struct net *net, const char *name) |
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{ |
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struct hlist_head *bucket = hash_bucket(net, name); |
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struct vport *vport; |
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hlist_for_each_entry_rcu(vport, bucket, hash_node, |
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lockdep_ovsl_is_held()) |
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if (!strcmp(name, ovs_vport_name(vport)) && |
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net_eq(ovs_dp_get_net(vport->dp), net)) |
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return vport; |
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return NULL; |
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} |
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/** |
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* ovs_vport_alloc - allocate and initialize new vport |
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* |
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* @priv_size: Size of private data area to allocate. |
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* @ops: vport device ops |
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* |
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* Allocate and initialize a new vport defined by @ops. The vport will contain |
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* a private data area of size @priv_size that can be accessed using |
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* vport_priv(). vports that are no longer needed should be released with |
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* vport_free(). |
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*/ |
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struct vport *ovs_vport_alloc(int priv_size, const struct vport_ops *ops, |
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const struct vport_parms *parms) |
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{ |
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struct vport *vport; |
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size_t alloc_size; |
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alloc_size = sizeof(struct vport); |
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if (priv_size) { |
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alloc_size = ALIGN(alloc_size, VPORT_ALIGN); |
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alloc_size += priv_size; |
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} |
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vport = kzalloc(alloc_size, GFP_KERNEL); |
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if (!vport) |
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return ERR_PTR(-ENOMEM); |
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vport->dp = parms->dp; |
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vport->port_no = parms->port_no; |
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vport->ops = ops; |
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INIT_HLIST_NODE(&vport->dp_hash_node); |
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if (ovs_vport_set_upcall_portids(vport, parms->upcall_portids)) { |
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kfree(vport); |
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return ERR_PTR(-EINVAL); |
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} |
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return vport; |
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} |
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EXPORT_SYMBOL_GPL(ovs_vport_alloc); |
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/** |
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* ovs_vport_free - uninitialize and free vport |
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* |
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* @vport: vport to free |
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* |
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* Frees a vport allocated with vport_alloc() when it is no longer needed. |
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* |
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* The caller must ensure that an RCU grace period has passed since the last |
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* time @vport was in a datapath. |
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*/ |
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void ovs_vport_free(struct vport *vport) |
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{ |
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/* vport is freed from RCU callback or error path, Therefore |
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* it is safe to use raw dereference. |
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*/ |
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kfree(rcu_dereference_raw(vport->upcall_portids)); |
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kfree(vport); |
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} |
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EXPORT_SYMBOL_GPL(ovs_vport_free); |
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static struct vport_ops *ovs_vport_lookup(const struct vport_parms *parms) |
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{ |
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struct vport_ops *ops; |
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list_for_each_entry(ops, &vport_ops_list, list) |
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if (ops->type == parms->type) |
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return ops; |
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return NULL; |
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} |
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/** |
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* ovs_vport_add - add vport device (for kernel callers) |
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* |
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* @parms: Information about new vport. |
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* |
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* Creates a new vport with the specified configuration (which is dependent on |
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* device type). ovs_mutex must be held. |
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*/ |
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struct vport *ovs_vport_add(const struct vport_parms *parms) |
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{ |
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struct vport_ops *ops; |
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struct vport *vport; |
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ops = ovs_vport_lookup(parms); |
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if (ops) { |
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struct hlist_head *bucket; |
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if (!try_module_get(ops->owner)) |
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return ERR_PTR(-EAFNOSUPPORT); |
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vport = ops->create(parms); |
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if (IS_ERR(vport)) { |
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module_put(ops->owner); |
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return vport; |
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} |
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bucket = hash_bucket(ovs_dp_get_net(vport->dp), |
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ovs_vport_name(vport)); |
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hlist_add_head_rcu(&vport->hash_node, bucket); |
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return vport; |
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} |
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/* Unlock to attempt module load and return -EAGAIN if load |
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* was successful as we need to restart the port addition |
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* workflow. |
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*/ |
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ovs_unlock(); |
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request_module("vport-type-%d", parms->type); |
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ovs_lock(); |
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if (!ovs_vport_lookup(parms)) |
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return ERR_PTR(-EAFNOSUPPORT); |
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else |
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return ERR_PTR(-EAGAIN); |
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} |
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/** |
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* ovs_vport_set_options - modify existing vport device (for kernel callers) |
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* |
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* @vport: vport to modify. |
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* @options: New configuration. |
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* |
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* Modifies an existing device with the specified configuration (which is |
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* dependent on device type). ovs_mutex must be held. |
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*/ |
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int ovs_vport_set_options(struct vport *vport, struct nlattr *options) |
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{ |
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if (!vport->ops->set_options) |
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return -EOPNOTSUPP; |
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return vport->ops->set_options(vport, options); |
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} |
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/** |
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* ovs_vport_del - delete existing vport device |
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* |
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* @vport: vport to delete. |
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* |
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* Detaches @vport from its datapath and destroys it. ovs_mutex must |
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* be held. |
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*/ |
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void ovs_vport_del(struct vport *vport) |
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{ |
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hlist_del_rcu(&vport->hash_node); |
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module_put(vport->ops->owner); |
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vport->ops->destroy(vport); |
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} |
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/** |
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* ovs_vport_get_stats - retrieve device stats |
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* |
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* @vport: vport from which to retrieve the stats |
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* @stats: location to store stats |
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* |
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* Retrieves transmit, receive, and error stats for the given device. |
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* |
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* Must be called with ovs_mutex or rcu_read_lock. |
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*/ |
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void ovs_vport_get_stats(struct vport *vport, struct ovs_vport_stats *stats) |
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{ |
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const struct rtnl_link_stats64 *dev_stats; |
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struct rtnl_link_stats64 temp; |
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dev_stats = dev_get_stats(vport->dev, &temp); |
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stats->rx_errors = dev_stats->rx_errors; |
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stats->tx_errors = dev_stats->tx_errors; |
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stats->tx_dropped = dev_stats->tx_dropped; |
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stats->rx_dropped = dev_stats->rx_dropped; |
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stats->rx_bytes = dev_stats->rx_bytes; |
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stats->rx_packets = dev_stats->rx_packets; |
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stats->tx_bytes = dev_stats->tx_bytes; |
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stats->tx_packets = dev_stats->tx_packets; |
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} |
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/** |
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* ovs_vport_get_options - retrieve device options |
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* |
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* @vport: vport from which to retrieve the options. |
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* @skb: sk_buff where options should be appended. |
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* |
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* Retrieves the configuration of the given device, appending an |
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* %OVS_VPORT_ATTR_OPTIONS attribute that in turn contains nested |
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* vport-specific attributes to @skb. |
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* |
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* Returns 0 if successful, -EMSGSIZE if @skb has insufficient room, or another |
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* negative error code if a real error occurred. If an error occurs, @skb is |
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* left unmodified. |
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* |
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* Must be called with ovs_mutex or rcu_read_lock. |
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*/ |
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int ovs_vport_get_options(const struct vport *vport, struct sk_buff *skb) |
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{ |
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struct nlattr *nla; |
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int err; |
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if (!vport->ops->get_options) |
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return 0; |
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nla = nla_nest_start_noflag(skb, OVS_VPORT_ATTR_OPTIONS); |
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if (!nla) |
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return -EMSGSIZE; |
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err = vport->ops->get_options(vport, skb); |
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if (err) { |
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nla_nest_cancel(skb, nla); |
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return err; |
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} |
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nla_nest_end(skb, nla); |
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return 0; |
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} |
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/** |
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* ovs_vport_set_upcall_portids - set upcall portids of @vport. |
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* |
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* @vport: vport to modify. |
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* @ids: new configuration, an array of port ids. |
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* |
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* Sets the vport's upcall_portids to @ids. |
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* |
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* Returns 0 if successful, -EINVAL if @ids is zero length or cannot be parsed |
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* as an array of U32. |
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* |
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* Must be called with ovs_mutex. |
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*/ |
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int ovs_vport_set_upcall_portids(struct vport *vport, const struct nlattr *ids) |
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{ |
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struct vport_portids *old, *vport_portids; |
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if (!nla_len(ids) || nla_len(ids) % sizeof(u32)) |
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return -EINVAL; |
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old = ovsl_dereference(vport->upcall_portids); |
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vport_portids = kmalloc(sizeof(*vport_portids) + nla_len(ids), |
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GFP_KERNEL); |
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if (!vport_portids) |
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return -ENOMEM; |
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vport_portids->n_ids = nla_len(ids) / sizeof(u32); |
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vport_portids->rn_ids = reciprocal_value(vport_portids->n_ids); |
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nla_memcpy(vport_portids->ids, ids, nla_len(ids)); |
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rcu_assign_pointer(vport->upcall_portids, vport_portids); |
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if (old) |
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kfree_rcu(old, rcu); |
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return 0; |
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} |
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/** |
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* ovs_vport_get_upcall_portids - get the upcall_portids of @vport. |
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* |
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* @vport: vport from which to retrieve the portids. |
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* @skb: sk_buff where portids should be appended. |
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* |
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* Retrieves the configuration of the given vport, appending the |
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* %OVS_VPORT_ATTR_UPCALL_PID attribute which is the array of upcall |
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* portids to @skb. |
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* |
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* Returns 0 if successful, -EMSGSIZE if @skb has insufficient room. |
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* If an error occurs, @skb is left unmodified. Must be called with |
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* ovs_mutex or rcu_read_lock. |
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*/ |
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int ovs_vport_get_upcall_portids(const struct vport *vport, |
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struct sk_buff *skb) |
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{ |
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struct vport_portids *ids; |
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ids = rcu_dereference_ovsl(vport->upcall_portids); |
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if (vport->dp->user_features & OVS_DP_F_VPORT_PIDS) |
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return nla_put(skb, OVS_VPORT_ATTR_UPCALL_PID, |
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ids->n_ids * sizeof(u32), (void *)ids->ids); |
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else |
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return nla_put_u32(skb, OVS_VPORT_ATTR_UPCALL_PID, ids->ids[0]); |
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} |
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/** |
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* ovs_vport_find_upcall_portid - find the upcall portid to send upcall. |
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* |
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* @vport: vport from which the missed packet is received. |
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* @skb: skb that the missed packet was received. |
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* |
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* Uses the skb_get_hash() to select the upcall portid to send the |
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* upcall. |
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* |
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* Returns the portid of the target socket. Must be called with rcu_read_lock. |
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*/ |
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u32 ovs_vport_find_upcall_portid(const struct vport *vport, |
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struct sk_buff *skb) |
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{ |
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struct vport_portids *ids; |
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u32 ids_index; |
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u32 hash; |
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ids = rcu_dereference(vport->upcall_portids); |
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/* If there is only one portid, select it in the fast-path. */ |
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if (ids->n_ids == 1) |
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return ids->ids[0]; |
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hash = skb_get_hash(skb); |
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ids_index = hash - ids->n_ids * reciprocal_divide(hash, ids->rn_ids); |
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return ids->ids[ids_index]; |
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} |
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/** |
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* ovs_vport_receive - pass up received packet to the datapath for processing |
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* |
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* @vport: vport that received the packet |
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* @skb: skb that was received |
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* @tun_info: tunnel (if any) that carried packet |
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* |
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* Must be called with rcu_read_lock. The packet cannot be shared and |
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* skb->data should point to the Ethernet header. |
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*/ |
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int ovs_vport_receive(struct vport *vport, struct sk_buff *skb, |
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const struct ip_tunnel_info *tun_info) |
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{ |
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struct sw_flow_key key; |
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int error; |
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OVS_CB(skb)->input_vport = vport; |
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OVS_CB(skb)->mru = 0; |
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OVS_CB(skb)->cutlen = 0; |
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if (unlikely(dev_net(skb->dev) != ovs_dp_get_net(vport->dp))) { |
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u32 mark; |
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mark = skb->mark; |
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skb_scrub_packet(skb, true); |
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skb->mark = mark; |
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tun_info = NULL; |
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} |
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/* Extract flow from 'skb' into 'key'. */ |
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error = ovs_flow_key_extract(tun_info, skb, &key); |
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if (unlikely(error)) { |
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kfree_skb(skb); |
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return error; |
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} |
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ovs_dp_process_packet(skb, &key); |
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return 0; |
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} |
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static int packet_length(const struct sk_buff *skb, |
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struct net_device *dev) |
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{ |
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int length = skb->len - dev->hard_header_len; |
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if (!skb_vlan_tag_present(skb) && |
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eth_type_vlan(skb->protocol)) |
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length -= VLAN_HLEN; |
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|
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/* Don't subtract for multiple VLAN tags. Most (all?) drivers allow |
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* (ETH_LEN + VLAN_HLEN) in addition to the mtu value, but almost none |
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* account for 802.1ad. e.g. is_skb_forwardable(). |
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*/ |
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return length > 0 ? length : 0; |
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} |
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void ovs_vport_send(struct vport *vport, struct sk_buff *skb, u8 mac_proto) |
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{ |
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int mtu = vport->dev->mtu; |
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switch (vport->dev->type) { |
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case ARPHRD_NONE: |
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if (mac_proto == MAC_PROTO_ETHERNET) { |
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skb_reset_network_header(skb); |
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skb_reset_mac_len(skb); |
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skb->protocol = htons(ETH_P_TEB); |
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} else if (mac_proto != MAC_PROTO_NONE) { |
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WARN_ON_ONCE(1); |
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goto drop; |
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} |
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break; |
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case ARPHRD_ETHER: |
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if (mac_proto != MAC_PROTO_ETHERNET) |
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goto drop; |
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break; |
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default: |
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goto drop; |
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} |
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if (unlikely(packet_length(skb, vport->dev) > mtu && |
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!skb_is_gso(skb))) { |
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net_warn_ratelimited("%s: dropped over-mtu packet: %d > %d\n", |
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vport->dev->name, |
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packet_length(skb, vport->dev), mtu); |
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vport->dev->stats.tx_errors++; |
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goto drop; |
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} |
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skb->dev = vport->dev; |
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skb->tstamp = 0; |
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vport->ops->send(skb); |
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return; |
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drop: |
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kfree_skb(skb); |
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}
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