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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 19:29:37 +00:00
![Jiri Benc](/assets/img/avatar_default.png)
Support receiving, extracting flow key and sending of L3 packets (packets without an Ethernet header). Note that even after this patch, non-Ethernet interfaces are still not allowed to be added to bridges. Similarly, netlink interface for sending and receiving L3 packets to/from user space is not in place yet. Based on previous versions by Lorand Jakab and Simon Horman. Signed-off-by: Lorand Jakab <lojakab@cisco.com> Signed-off-by: Simon Horman <simon.horman@netronome.com> Signed-off-by: Jiri Benc <jbenc@redhat.com> Acked-by: Pravin B Shelar <pshelar@ovn.org> Signed-off-by: David S. Miller <davem@davemloft.net>
522 lines
13 KiB
C
522 lines
13 KiB
C
/*
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* Copyright (c) 2007-2014 Nicira, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA
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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 = kzalloc(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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* @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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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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ASSERT_OVSL();
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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(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, 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 (ids->n_ids == 1 && ids->ids[0] == 0)
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return 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_key: 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 unsigned int packet_length(const struct sk_buff *skb,
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struct net_device *dev)
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{
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unsigned 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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/* 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;
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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;
|
|
}
|
|
break;
|
|
case ARPHRD_ETHER:
|
|
if (mac_proto != MAC_PROTO_ETHERNET)
|
|
goto drop;
|
|
break;
|
|
default:
|
|
goto drop;
|
|
}
|
|
|
|
if (unlikely(packet_length(skb, vport->dev) > mtu &&
|
|
!skb_is_gso(skb))) {
|
|
net_warn_ratelimited("%s: dropped over-mtu packet: %d > %d\n",
|
|
vport->dev->name,
|
|
packet_length(skb, vport->dev), mtu);
|
|
vport->dev->stats.tx_errors++;
|
|
goto drop;
|
|
}
|
|
|
|
skb->dev = vport->dev;
|
|
vport->ops->send(skb);
|
|
return;
|
|
|
|
drop:
|
|
kfree_skb(skb);
|
|
}
|