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Linux/net/openvswitch/flow.h

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  1 /*
  2  * Copyright (c) 2007-2017 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 <linux/cpumask.h>
 35 #include <net/inet_ecn.h>
 36 #include <net/ip_tunnels.h>
 37 #include <net/dst_metadata.h>
 38 #include <net/nsh.h>
 39 
 40 struct sk_buff;
 41 
 42 enum sw_flow_mac_proto {
 43         MAC_PROTO_NONE = 0,
 44         MAC_PROTO_ETHERNET,
 45 };
 46 #define SW_FLOW_KEY_INVALID     0x80
 47 
 48 /* Store options at the end of the array if they are less than the
 49  * maximum size. This allows us to get the benefits of variable length
 50  * matching for small options.
 51  */
 52 #define TUN_METADATA_OFFSET(opt_len) \
 53         (FIELD_SIZEOF(struct sw_flow_key, tun_opts) - opt_len)
 54 #define TUN_METADATA_OPTS(flow_key, opt_len) \
 55         ((void *)((flow_key)->tun_opts + TUN_METADATA_OFFSET(opt_len)))
 56 
 57 struct ovs_tunnel_info {
 58         struct metadata_dst     *tun_dst;
 59 };
 60 
 61 struct vlan_head {
 62         __be16 tpid; /* Vlan type. Generally 802.1q or 802.1ad.*/
 63         __be16 tci;  /* 0 if no VLAN, VLAN_TAG_PRESENT set otherwise. */
 64 };
 65 
 66 #define OVS_SW_FLOW_KEY_METADATA_SIZE                   \
 67         (offsetof(struct sw_flow_key, recirc_id) +      \
 68         FIELD_SIZEOF(struct sw_flow_key, recirc_id))
 69 
 70 struct ovs_key_nsh {
 71         struct ovs_nsh_key_base base;
 72         __be32 context[NSH_MD1_CONTEXT_SIZE];
 73 };
 74 
 75 struct sw_flow_key {
 76         u8 tun_opts[IP_TUNNEL_OPTS_MAX];
 77         u8 tun_opts_len;
 78         struct ip_tunnel_key tun_key;   /* Encapsulating tunnel key. */
 79         struct {
 80                 u32     priority;       /* Packet QoS priority. */
 81                 u32     skb_mark;       /* SKB mark. */
 82                 u16     in_port;        /* Input switch port (or DP_MAX_PORTS). */
 83         } __packed phy; /* Safe when right after 'tun_key'. */
 84         u8 mac_proto;                   /* MAC layer protocol (e.g. Ethernet). */
 85         u8 tun_proto;                   /* Protocol of encapsulating tunnel. */
 86         u32 ovs_flow_hash;              /* Datapath computed hash value.  */
 87         u32 recirc_id;                  /* Recirculation ID.  */
 88         struct {
 89                 u8     src[ETH_ALEN];   /* Ethernet source address. */
 90                 u8     dst[ETH_ALEN];   /* Ethernet destination address. */
 91                 struct vlan_head vlan;
 92                 struct vlan_head cvlan;
 93                 __be16 type;            /* Ethernet frame type. */
 94         } eth;
 95         /* Filling a hole of two bytes. */
 96         u8 ct_state;
 97         u8 ct_orig_proto;               /* CT original direction tuple IP
 98                                          * protocol.
 99                                          */
100         union {
101                 struct {
102                         __be32 top_lse; /* top label stack entry */
103                 } mpls;
104                 struct {
105                         u8     proto;   /* IP protocol or lower 8 bits of ARP opcode. */
106                         u8     tos;         /* IP ToS. */
107                         u8     ttl;         /* IP TTL/hop limit. */
108                         u8     frag;    /* One of OVS_FRAG_TYPE_*. */
109                 } ip;
110         };
111         u16 ct_zone;                    /* Conntrack zone. */
112         struct {
113                 __be16 src;             /* TCP/UDP/SCTP source port. */
114                 __be16 dst;             /* TCP/UDP/SCTP destination port. */
115                 __be16 flags;           /* TCP flags. */
116         } tp;
117         union {
118                 struct {
119                         struct {
120                                 __be32 src;     /* IP source address. */
121                                 __be32 dst;     /* IP destination address. */
122                         } addr;
123                         union {
124                                 struct {
125                                         __be32 src;
126                                         __be32 dst;
127                                 } ct_orig;      /* Conntrack original direction fields. */
128                                 struct {
129                                         u8 sha[ETH_ALEN];       /* ARP source hardware address. */
130                                         u8 tha[ETH_ALEN];       /* ARP target hardware address. */
131                                 } arp;
132                         };
133                 } ipv4;
134                 struct {
135                         struct {
136                                 struct in6_addr src;    /* IPv6 source address. */
137                                 struct in6_addr dst;    /* IPv6 destination address. */
138                         } addr;
139                         __be32 label;                   /* IPv6 flow label. */
140                         union {
141                                 struct {
142                                         struct in6_addr src;
143                                         struct in6_addr dst;
144                                 } ct_orig;      /* Conntrack original direction fields. */
145                                 struct {
146                                         struct in6_addr target; /* ND target address. */
147                                         u8 sll[ETH_ALEN];       /* ND source link layer address. */
148                                         u8 tll[ETH_ALEN];       /* ND target link layer address. */
149                                 } nd;
150                         };
151                 } ipv6;
152                 struct ovs_key_nsh nsh;         /* network service header */
153         };
154         struct {
155                 /* Connection tracking fields not packed above. */
156                 struct {
157                         __be16 src;     /* CT orig tuple tp src port. */
158                         __be16 dst;     /* CT orig tuple tp dst port. */
159                 } orig_tp;
160                 u32 mark;
161                 struct ovs_key_ct_labels labels;
162         } ct;
163 
164 } __aligned(BITS_PER_LONG/8); /* Ensure that we can do comparisons as longs. */
165 
166 static inline bool sw_flow_key_is_nd(const struct sw_flow_key *key)
167 {
168         return key->eth.type == htons(ETH_P_IPV6) &&
169                 key->ip.proto == NEXTHDR_ICMP &&
170                 key->tp.dst == 0 &&
171                 (key->tp.src == htons(NDISC_NEIGHBOUR_SOLICITATION) ||
172                  key->tp.src == htons(NDISC_NEIGHBOUR_ADVERTISEMENT));
173 }
174 
175 struct sw_flow_key_range {
176         unsigned short int start;
177         unsigned short int end;
178 };
179 
180 struct sw_flow_mask {
181         int ref_count;
182         struct rcu_head rcu;
183         struct list_head list;
184         struct sw_flow_key_range range;
185         struct sw_flow_key key;
186 };
187 
188 struct sw_flow_match {
189         struct sw_flow_key *key;
190         struct sw_flow_key_range range;
191         struct sw_flow_mask *mask;
192 };
193 
194 #define MAX_UFID_LENGTH 16 /* 128 bits */
195 
196 struct sw_flow_id {
197         u32 ufid_len;
198         union {
199                 u32 ufid[MAX_UFID_LENGTH / 4];
200                 struct sw_flow_key *unmasked_key;
201         };
202 };
203 
204 struct sw_flow_actions {
205         struct rcu_head rcu;
206         size_t orig_len;        /* From flow_cmd_new netlink actions size */
207         u32 actions_len;
208         struct nlattr actions[];
209 };
210 
211 struct flow_stats {
212         u64 packet_count;               /* Number of packets matched. */
213         u64 byte_count;                 /* Number of bytes matched. */
214         unsigned long used;             /* Last used time (in jiffies). */
215         spinlock_t lock;                /* Lock for atomic stats update. */
216         __be16 tcp_flags;               /* Union of seen TCP flags. */
217 };
218 
219 struct sw_flow {
220         struct rcu_head rcu;
221         struct {
222                 struct hlist_node node[2];
223                 u32 hash;
224         } flow_table, ufid_table;
225         int stats_last_writer;          /* CPU id of the last writer on
226                                          * 'stats[0]'.
227                                          */
228         struct sw_flow_key key;
229         struct sw_flow_id id;
230         struct cpumask cpu_used_mask;
231         struct sw_flow_mask *mask;
232         struct sw_flow_actions __rcu *sf_acts;
233         struct flow_stats __rcu *stats[]; /* One for each CPU.  First one
234                                            * is allocated at flow creation time,
235                                            * the rest are allocated on demand
236                                            * while holding the 'stats[0].lock'.
237                                            */
238 };
239 
240 struct arp_eth_header {
241         __be16      ar_hrd;     /* format of hardware address   */
242         __be16      ar_pro;     /* format of protocol address   */
243         unsigned char   ar_hln; /* length of hardware address   */
244         unsigned char   ar_pln; /* length of protocol address   */
245         __be16      ar_op;      /* ARP opcode (command)     */
246 
247         /* Ethernet+IPv4 specific members. */
248         unsigned char       ar_sha[ETH_ALEN];   /* sender hardware address  */
249         unsigned char       ar_sip[4];          /* sender IP address        */
250         unsigned char       ar_tha[ETH_ALEN];   /* target hardware address  */
251         unsigned char       ar_tip[4];          /* target IP address        */
252 } __packed;
253 
254 static inline u8 ovs_key_mac_proto(const struct sw_flow_key *key)
255 {
256         return key->mac_proto & ~SW_FLOW_KEY_INVALID;
257 }
258 
259 static inline u16 __ovs_mac_header_len(u8 mac_proto)
260 {
261         return mac_proto == MAC_PROTO_ETHERNET ? ETH_HLEN : 0;
262 }
263 
264 static inline u16 ovs_mac_header_len(const struct sw_flow_key *key)
265 {
266         return __ovs_mac_header_len(ovs_key_mac_proto(key));
267 }
268 
269 static inline bool ovs_identifier_is_ufid(const struct sw_flow_id *sfid)
270 {
271         return sfid->ufid_len;
272 }
273 
274 static inline bool ovs_identifier_is_key(const struct sw_flow_id *sfid)
275 {
276         return !ovs_identifier_is_ufid(sfid);
277 }
278 
279 void ovs_flow_stats_update(struct sw_flow *, __be16 tcp_flags,
280                            const struct sk_buff *);
281 void ovs_flow_stats_get(const struct sw_flow *, struct ovs_flow_stats *,
282                         unsigned long *used, __be16 *tcp_flags);
283 void ovs_flow_stats_clear(struct sw_flow *);
284 u64 ovs_flow_used_time(unsigned long flow_jiffies);
285 
286 int ovs_flow_key_update(struct sk_buff *skb, struct sw_flow_key *key);
287 int ovs_flow_key_extract(const struct ip_tunnel_info *tun_info,
288                          struct sk_buff *skb,
289                          struct sw_flow_key *key);
290 /* Extract key from packet coming from userspace. */
291 int ovs_flow_key_extract_userspace(struct net *net, const struct nlattr *attr,
292                                    struct sk_buff *skb,
293                                    struct sw_flow_key *key, bool log);
294 
295 #endif /* flow.h */
296 

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