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TOMOYO Linux Cross Reference
Linux/net/openvswitch/flow.h

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  1 /*
  2  * Copyright (c) 2007-2014 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 FLOW_H
 20 #define FLOW_H 1
 21 
 22 #include <linux/cache.h>
 23 #include <linux/kernel.h>
 24 #include <linux/netlink.h>
 25 #include <linux/openvswitch.h>
 26 #include <linux/spinlock.h>
 27 #include <linux/types.h>
 28 #include <linux/rcupdate.h>
 29 #include <linux/if_ether.h>
 30 #include <linux/in6.h>
 31 #include <linux/jiffies.h>
 32 #include <linux/time.h>
 33 #include <linux/flex_array.h>
 34 #include <net/inet_ecn.h>
 35 #include <net/ip_tunnels.h>
 36 #include <net/dst_metadata.h>
 37 
 38 struct sk_buff;
 39 
 40 enum sw_flow_mac_proto {
 41         MAC_PROTO_NONE = 0,
 42         MAC_PROTO_ETHERNET,
 43 };
 44 #define SW_FLOW_KEY_INVALID     0x80
 45 
 46 /* Store options at the end of the array if they are less than the
 47  * maximum size. This allows us to get the benefits of variable length
 48  * matching for small options.
 49  */
 50 #define TUN_METADATA_OFFSET(opt_len) \
 51         (FIELD_SIZEOF(struct sw_flow_key, tun_opts) - opt_len)
 52 #define TUN_METADATA_OPTS(flow_key, opt_len) \
 53         ((void *)((flow_key)->tun_opts + TUN_METADATA_OFFSET(opt_len)))
 54 
 55 struct ovs_tunnel_info {
 56         struct metadata_dst     *tun_dst;
 57 };
 58 
 59 struct vlan_head {
 60         __be16 tpid; /* Vlan type. Generally 802.1q or 802.1ad.*/
 61         __be16 tci;  /* 0 if no VLAN, VLAN_TAG_PRESENT set otherwise. */
 62 };
 63 
 64 #define OVS_SW_FLOW_KEY_METADATA_SIZE                   \
 65         (offsetof(struct sw_flow_key, recirc_id) +      \
 66         FIELD_SIZEOF(struct sw_flow_key, recirc_id))
 67 
 68 struct sw_flow_key {
 69         u8 tun_opts[IP_TUNNEL_OPTS_MAX];
 70         u8 tun_opts_len;
 71         struct ip_tunnel_key tun_key;   /* Encapsulating tunnel key. */
 72         struct {
 73                 u32     priority;       /* Packet QoS priority. */
 74                 u32     skb_mark;       /* SKB mark. */
 75                 u16     in_port;        /* Input switch port (or DP_MAX_PORTS). */
 76         } __packed phy; /* Safe when right after 'tun_key'. */
 77         u8 mac_proto;                   /* MAC layer protocol (e.g. Ethernet). */
 78         u8 tun_proto;                   /* Protocol of encapsulating tunnel. */
 79         u32 ovs_flow_hash;              /* Datapath computed hash value.  */
 80         u32 recirc_id;                  /* Recirculation ID.  */
 81         struct {
 82                 u8     src[ETH_ALEN];   /* Ethernet source address. */
 83                 u8     dst[ETH_ALEN];   /* Ethernet destination address. */
 84                 struct vlan_head vlan;
 85                 struct vlan_head cvlan;
 86                 __be16 type;            /* Ethernet frame type. */
 87         } eth;
 88         union {
 89                 struct {
 90                         __be32 top_lse; /* top label stack entry */
 91                 } mpls;
 92                 struct {
 93                         u8     proto;   /* IP protocol or lower 8 bits of ARP opcode. */
 94                         u8     tos;         /* IP ToS. */
 95                         u8     ttl;         /* IP TTL/hop limit. */
 96                         u8     frag;    /* One of OVS_FRAG_TYPE_*. */
 97                 } ip;
 98         };
 99         struct {
100                 __be16 src;             /* TCP/UDP/SCTP source port. */
101                 __be16 dst;             /* TCP/UDP/SCTP destination port. */
102                 __be16 flags;           /* TCP flags. */
103         } tp;
104         union {
105                 struct {
106                         struct {
107                                 __be32 src;     /* IP source address. */
108                                 __be32 dst;     /* IP destination address. */
109                         } addr;
110                         struct {
111                                 u8 sha[ETH_ALEN];       /* ARP source hardware address. */
112                                 u8 tha[ETH_ALEN];       /* ARP target hardware address. */
113                         } arp;
114                 } ipv4;
115                 struct {
116                         struct {
117                                 struct in6_addr src;    /* IPv6 source address. */
118                                 struct in6_addr dst;    /* IPv6 destination address. */
119                         } addr;
120                         __be32 label;                   /* IPv6 flow label. */
121                         struct {
122                                 struct in6_addr target; /* ND target address. */
123                                 u8 sll[ETH_ALEN];       /* ND source link layer address. */
124                                 u8 tll[ETH_ALEN];       /* ND target link layer address. */
125                         } nd;
126                 } ipv6;
127         };
128         struct {
129                 /* Connection tracking fields. */
130                 u16 zone;
131                 u32 mark;
132                 u8 state;
133                 struct ovs_key_ct_labels labels;
134         } ct;
135 
136 } __aligned(BITS_PER_LONG/8); /* Ensure that we can do comparisons as longs. */
137 
138 struct sw_flow_key_range {
139         unsigned short int start;
140         unsigned short int end;
141 };
142 
143 struct sw_flow_mask {
144         int ref_count;
145         struct rcu_head rcu;
146         struct list_head list;
147         struct sw_flow_key_range range;
148         struct sw_flow_key key;
149 };
150 
151 struct sw_flow_match {
152         struct sw_flow_key *key;
153         struct sw_flow_key_range range;
154         struct sw_flow_mask *mask;
155 };
156 
157 #define MAX_UFID_LENGTH 16 /* 128 bits */
158 
159 struct sw_flow_id {
160         u32 ufid_len;
161         union {
162                 u32 ufid[MAX_UFID_LENGTH / 4];
163                 struct sw_flow_key *unmasked_key;
164         };
165 };
166 
167 struct sw_flow_actions {
168         struct rcu_head rcu;
169         size_t orig_len;        /* From flow_cmd_new netlink actions size */
170         u32 actions_len;
171         struct nlattr actions[];
172 };
173 
174 struct flow_stats {
175         u64 packet_count;               /* Number of packets matched. */
176         u64 byte_count;                 /* Number of bytes matched. */
177         unsigned long used;             /* Last used time (in jiffies). */
178         spinlock_t lock;                /* Lock for atomic stats update. */
179         __be16 tcp_flags;               /* Union of seen TCP flags. */
180 };
181 
182 struct sw_flow {
183         struct rcu_head rcu;
184         struct {
185                 struct hlist_node node[2];
186                 u32 hash;
187         } flow_table, ufid_table;
188         int stats_last_writer;          /* CPU id of the last writer on
189                                          * 'stats[0]'.
190                                          */
191         struct sw_flow_key key;
192         struct sw_flow_id id;
193         struct sw_flow_mask *mask;
194         struct sw_flow_actions __rcu *sf_acts;
195         struct flow_stats __rcu *stats[]; /* One for each CPU.  First one
196                                            * is allocated at flow creation time,
197                                            * the rest are allocated on demand
198                                            * while holding the 'stats[0].lock'.
199                                            */
200 };
201 
202 struct arp_eth_header {
203         __be16      ar_hrd;     /* format of hardware address   */
204         __be16      ar_pro;     /* format of protocol address   */
205         unsigned char   ar_hln; /* length of hardware address   */
206         unsigned char   ar_pln; /* length of protocol address   */
207         __be16      ar_op;      /* ARP opcode (command)     */
208 
209         /* Ethernet+IPv4 specific members. */
210         unsigned char       ar_sha[ETH_ALEN];   /* sender hardware address  */
211         unsigned char       ar_sip[4];          /* sender IP address        */
212         unsigned char       ar_tha[ETH_ALEN];   /* target hardware address  */
213         unsigned char       ar_tip[4];          /* target IP address        */
214 } __packed;
215 
216 static inline u8 ovs_key_mac_proto(const struct sw_flow_key *key)
217 {
218         return key->mac_proto & ~SW_FLOW_KEY_INVALID;
219 }
220 
221 static inline u16 __ovs_mac_header_len(u8 mac_proto)
222 {
223         return mac_proto == MAC_PROTO_ETHERNET ? ETH_HLEN : 0;
224 }
225 
226 static inline u16 ovs_mac_header_len(const struct sw_flow_key *key)
227 {
228         return __ovs_mac_header_len(ovs_key_mac_proto(key));
229 }
230 
231 static inline bool ovs_identifier_is_ufid(const struct sw_flow_id *sfid)
232 {
233         return sfid->ufid_len;
234 }
235 
236 static inline bool ovs_identifier_is_key(const struct sw_flow_id *sfid)
237 {
238         return !ovs_identifier_is_ufid(sfid);
239 }
240 
241 void ovs_flow_stats_update(struct sw_flow *, __be16 tcp_flags,
242                            const struct sk_buff *);
243 void ovs_flow_stats_get(const struct sw_flow *, struct ovs_flow_stats *,
244                         unsigned long *used, __be16 *tcp_flags);
245 void ovs_flow_stats_clear(struct sw_flow *);
246 u64 ovs_flow_used_time(unsigned long flow_jiffies);
247 
248 int ovs_flow_key_update(struct sk_buff *skb, struct sw_flow_key *key);
249 int ovs_flow_key_extract(const struct ip_tunnel_info *tun_info,
250                          struct sk_buff *skb,
251                          struct sw_flow_key *key);
252 /* Extract key from packet coming from userspace. */
253 int ovs_flow_key_extract_userspace(struct net *net, const struct nlattr *attr,
254                                    struct sk_buff *skb,
255                                    struct sw_flow_key *key, bool log);
256 
257 #endif /* flow.h */
258 

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