net/openvswitch/vport.h

   1 /*
   2  * Copyright (c) 2007-2012 Nicira, Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of version 2 of the GNU General Public
   6  * License as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program; if not, write to the Free Software
  15  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  16  * 02110-1301, USA
  17  */
  18
  19 #ifndef VPORT_H
  20 #define VPORT_H 1
  21
  22 #include <linux/if_tunnel.h>
  23 #include <linux/list.h>
  24 #include <linux/netlink.h>
  25 #include <linux/openvswitch.h>
  26 #include <linux/reciprocal_div.h>
  27 #include <linux/skbuff.h>
  28 #include <linux/spinlock.h>
  29 #include <linux/u64_stats_sync.h>
  30
  31 #include "datapath.h"
  32
  33 struct vport;
  34 struct vport_parms;
  35
  36 /* The following definitions are for users of the vport subsytem: */
  37
  38 int ovs_vport_init(void);
  39 void ovs_vport_exit(void);
  40
  41 struct vport *ovs_vport_add(const struct vport_parms *);
  42 void ovs_vport_del(struct vport *);
  43
  44 struct vport *ovs_vport_locate(const struct net *net, const char *name);
  45
  46 void ovs_vport_get_stats(struct vport *, struct ovs_vport_stats *);
  47
  48 int ovs_vport_set_options(struct vport *, struct nlattr *options);
  49 int ovs_vport_get_options(const struct vport *, struct sk_buff *);
  50
  51 int ovs_vport_set_upcall_portids(struct vport *, const struct nlattr *pids);
  52 int ovs_vport_get_upcall_portids(const struct vport *, struct sk_buff *);
  53 u32 ovs_vport_find_upcall_portid(const struct vport *, struct sk_buff *);
  54
  55 /**
  56  * struct vport_portids - array of netlink portids of a vport.
  57  *                        must be protected by rcu.
  58  * @rn_ids: The reciprocal value of @n_ids.
  59  * @rcu: RCU callback head for deferred destruction.
  60  * @n_ids: Size of @ids array.
  61  * @ids: Array storing the Netlink socket pids to be used for packets received
  62  * on this port that miss the flow table.
  63  */
  64 struct vport_portids {
  65         struct reciprocal_value rn_ids;
  66         struct rcu_head rcu;
  67         u32 n_ids;
  68         u32 ids[];
  69 };
  70
  71 /**
  72  * struct vport - one port within a datapath
  73  * @rcu: RCU callback head for deferred destruction.
  74  * @dp: Datapath to which this port belongs.
  75  * @upcall_portids: RCU protected 'struct vport_portids'.
  76  * @port_no: Index into @dp's @ports array.
  77  * @hash_node: Element in @dev_table hash table in vport.c.
  78  * @dp_hash_node: Element in @datapath->ports hash table in datapath.c.
  79  * @ops: Class structure.
  80  * @detach_list: list used for detaching vport in net-exit call.
  81  */
  82 struct vport {
  83         struct net_device *dev;
  84         struct datapath *dp;
  85         struct vport_portids __rcu *upcall_portids;
  86         u16 port_no;
  87
  88         struct hlist_node hash_node;
  89         struct hlist_node dp_hash_node;
  90         const struct vport_ops *ops;
  91
  92         struct list_head detach_list;
  93         struct rcu_head rcu;
  94 };
  95
  96 /**
  97  * struct vport_parms - parameters for creating a new vport
  98  *
  99  * @name: New vport's name.
 100  * @type: New vport's type.
 101  * @options: %OVS_VPORT_ATTR_OPTIONS attribute from Netlink message, %NULL if
 102  * none was supplied.
 103  * @dp: New vport's datapath.
 104  * @port_no: New vport's port number.
 105  */
 106 struct vport_parms {
 107         const char *name;
 108         enum ovs_vport_type type;
 109         struct nlattr *options;
 110
 111         /* For ovs_vport_alloc(). */
 112         struct datapath *dp;
 113         u16 port_no;
 114         struct nlattr *upcall_portids;
 115 };
 116
 117 /**
 118  * struct vport_ops - definition of a type of virtual port
 119  *
 120  * @type: %OVS_VPORT_TYPE_* value for this type of virtual port.
 121  * @create: Create a new vport configured as specified.  On success returns
 122  * a new vport allocated with ovs_vport_alloc(), otherwise an ERR_PTR() value.
 123  * @destroy: Destroys a vport.  Must call vport_free() on the vport but not
 124  * before an RCU grace period has elapsed.
 125  * @set_options: Modify the configuration of an existing vport.  May be %NULL
 126  * if modification is not supported.
 127  * @get_options: Appends vport-specific attributes for the configuration of an
 128  * existing vport to a &struct sk_buff.  May be %NULL for a vport that does not
 129  * have any configuration.
 130  * @send: Send a packet on the device.
 131  * zero for dropped packets or negative for error.
 132  */
 133 struct vport_ops {
 134         enum ovs_vport_type type;
 135
 136         /* Called with ovs_mutex. */
 137         struct vport *(*create)(const struct vport_parms *);
 138         void (*destroy)(struct vport *);
 139
 140         int (*set_options)(struct vport *, struct nlattr *);
 141         int (*get_options)(const struct vport *, struct sk_buff *);
 142
 143         netdev_tx_t (*send) (struct sk_buff *skb);
 144         struct module *owner;
 145         struct list_head list;
 146 };
 147
 148 struct vport *ovs_vport_alloc(int priv_size, const struct vport_ops *,
 149                               const struct vport_parms *);
 150 void ovs_vport_free(struct vport *);
 151 void ovs_vport_deferred_free(struct vport *vport);
 152
 153 #define VPORT_ALIGN 8
 154
 155 /**
 156  *      vport_priv - access private data area of vport
 157  *
 158  * @vport: vport to access
 159  *
 160  * If a nonzero size was passed in priv_size of vport_alloc() a private data
 161  * area was allocated on creation.  This allows that area to be accessed and
 162  * used for any purpose needed by the vport implementer.
 163  */
 164 static inline void *vport_priv(const struct vport *vport)
 165 {
 166         return (u8 *)(uintptr_t)vport + ALIGN(sizeof(struct vport), VPORT_ALIGN);
 167 }
 168
 169 /**
 170  *      vport_from_priv - lookup vport from private data pointer
 171  *
 172  * @priv: Start of private data area.
 173  *
 174  * It is sometimes useful to translate from a pointer to the private data
 175  * area to the vport, such as in the case where the private data pointer is
 176  * the result of a hash table lookup.  @priv must point to the start of the
 177  * private data area.
 178  */
 179 static inline struct vport *vport_from_priv(void *priv)
 180 {
 181         return (struct vport *)((u8 *)priv - ALIGN(sizeof(struct vport), VPORT_ALIGN));
 182 }
 183
 184 int ovs_vport_receive(struct vport *, struct sk_buff *,
 185                       const struct ip_tunnel_info *);
 186
 187 static inline void ovs_skb_postpush_rcsum(struct sk_buff *skb,
 188                                       const void *start, unsigned int len)
 189 {
 190         if (skb->ip_summed == CHECKSUM_COMPLETE)
 191                 skb->csum = csum_add(skb->csum, csum_partial(start, len, 0));
 192 }
 193
 194 static inline const char *ovs_vport_name(struct vport *vport)
 195 {
 196         return vport->dev->name;
 197 }
 198
 199 int __ovs_vport_ops_register(struct vport_ops *ops);
 200 #define ovs_vport_ops_register(ops)             \
 201         ({                                      \
 202                 (ops)->owner = THIS_MODULE;     \
 203                 __ovs_vport_ops_register(ops);  \
 204         })
 205
 206 void ovs_vport_ops_unregister(struct vport_ops *ops);
 207
 208 static inline struct rtable *ovs_tunnel_route_lookup(struct net *net,
 209                                                      const struct ip_tunnel_key *key,
 210                                                      u32 mark,
 211                                                      struct flowi4 *fl,
 212                                                      u8 protocol)
 213 {
 214         struct rtable *rt;
 215
 216         memset(fl, 0, sizeof(*fl));
 217         fl->daddr = key->u.ipv4.dst;
 218         fl->saddr = key->u.ipv4.src;
 219         fl->flowi4_tos = RT_TOS(key->tos);
 220         fl->flowi4_mark = mark;
 221         fl->flowi4_proto = protocol;
 222
 223         rt = ip_route_output_key(net, fl);
 224         return rt;
 225 }
 226
 227 void ovs_vport_send(struct vport *vport, struct sk_buff *skb);
 228
 229 #endif /* vport.h */