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-rw-r--r--net/openvswitch/flow.h298
1 files changed, 298 insertions, 0 deletions
diff --git a/net/openvswitch/flow.h b/net/openvswitch/flow.h
new file mode 100644
index 000000000..073ab73ff
--- /dev/null
+++ b/net/openvswitch/flow.h
@@ -0,0 +1,298 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2007-2017 Nicira, Inc.
+ */
+
+#ifndef FLOW_H
+#define FLOW_H 1
+
+#include <linux/cache.h>
+#include <linux/kernel.h>
+#include <linux/netlink.h>
+#include <linux/openvswitch.h>
+#include <linux/spinlock.h>
+#include <linux/types.h>
+#include <linux/rcupdate.h>
+#include <linux/if_ether.h>
+#include <linux/in6.h>
+#include <linux/jiffies.h>
+#include <linux/time.h>
+#include <linux/cpumask.h>
+#include <net/inet_ecn.h>
+#include <net/ip_tunnels.h>
+#include <net/dst_metadata.h>
+#include <net/nsh.h>
+
+struct sk_buff;
+
+enum sw_flow_mac_proto {
+ MAC_PROTO_NONE = 0,
+ MAC_PROTO_ETHERNET,
+};
+#define SW_FLOW_KEY_INVALID 0x80
+#define MPLS_LABEL_DEPTH 3
+
+/* Bit definitions for IPv6 Extension Header pseudo-field. */
+enum ofp12_ipv6exthdr_flags {
+ OFPIEH12_NONEXT = 1 << 0, /* "No next header" encountered. */
+ OFPIEH12_ESP = 1 << 1, /* Encrypted Sec Payload header present. */
+ OFPIEH12_AUTH = 1 << 2, /* Authentication header present. */
+ OFPIEH12_DEST = 1 << 3, /* 1 or 2 dest headers present. */
+ OFPIEH12_FRAG = 1 << 4, /* Fragment header present. */
+ OFPIEH12_ROUTER = 1 << 5, /* Router header present. */
+ OFPIEH12_HOP = 1 << 6, /* Hop-by-hop header present. */
+ OFPIEH12_UNREP = 1 << 7, /* Unexpected repeats encountered. */
+ OFPIEH12_UNSEQ = 1 << 8 /* Unexpected sequencing encountered. */
+};
+
+/* Store options at the end of the array if they are less than the
+ * maximum size. This allows us to get the benefits of variable length
+ * matching for small options.
+ */
+#define TUN_METADATA_OFFSET(opt_len) \
+ (sizeof_field(struct sw_flow_key, tun_opts) - opt_len)
+#define TUN_METADATA_OPTS(flow_key, opt_len) \
+ ((void *)((flow_key)->tun_opts + TUN_METADATA_OFFSET(opt_len)))
+
+struct ovs_tunnel_info {
+ struct metadata_dst *tun_dst;
+};
+
+struct vlan_head {
+ __be16 tpid; /* Vlan type. Generally 802.1q or 802.1ad.*/
+ __be16 tci; /* 0 if no VLAN, VLAN_CFI_MASK set otherwise. */
+};
+
+#define OVS_SW_FLOW_KEY_METADATA_SIZE \
+ (offsetof(struct sw_flow_key, recirc_id) + \
+ sizeof_field(struct sw_flow_key, recirc_id))
+
+struct ovs_key_nsh {
+ struct ovs_nsh_key_base base;
+ __be32 context[NSH_MD1_CONTEXT_SIZE];
+};
+
+struct sw_flow_key {
+ u8 tun_opts[IP_TUNNEL_OPTS_MAX];
+ u8 tun_opts_len;
+ struct ip_tunnel_key tun_key; /* Encapsulating tunnel key. */
+ struct {
+ u32 priority; /* Packet QoS priority. */
+ u32 skb_mark; /* SKB mark. */
+ u16 in_port; /* Input switch port (or DP_MAX_PORTS). */
+ } __packed phy; /* Safe when right after 'tun_key'. */
+ u8 mac_proto; /* MAC layer protocol (e.g. Ethernet). */
+ u8 tun_proto; /* Protocol of encapsulating tunnel. */
+ u32 ovs_flow_hash; /* Datapath computed hash value. */
+ u32 recirc_id; /* Recirculation ID. */
+ struct {
+ u8 src[ETH_ALEN]; /* Ethernet source address. */
+ u8 dst[ETH_ALEN]; /* Ethernet destination address. */
+ struct vlan_head vlan;
+ struct vlan_head cvlan;
+ __be16 type; /* Ethernet frame type. */
+ } eth;
+ /* Filling a hole of two bytes. */
+ u8 ct_state;
+ u8 ct_orig_proto; /* CT original direction tuple IP
+ * protocol.
+ */
+ union {
+ struct {
+ u8 proto; /* IP protocol or lower 8 bits of ARP opcode. */
+ u8 tos; /* IP ToS. */
+ u8 ttl; /* IP TTL/hop limit. */
+ u8 frag; /* One of OVS_FRAG_TYPE_*. */
+ } ip;
+ };
+ u16 ct_zone; /* Conntrack zone. */
+ struct {
+ __be16 src; /* TCP/UDP/SCTP source port. */
+ __be16 dst; /* TCP/UDP/SCTP destination port. */
+ __be16 flags; /* TCP flags. */
+ } tp;
+ union {
+ struct {
+ struct {
+ __be32 src; /* IP source address. */
+ __be32 dst; /* IP destination address. */
+ } addr;
+ union {
+ struct {
+ __be32 src;
+ __be32 dst;
+ } ct_orig; /* Conntrack original direction fields. */
+ struct {
+ u8 sha[ETH_ALEN]; /* ARP source hardware address. */
+ u8 tha[ETH_ALEN]; /* ARP target hardware address. */
+ } arp;
+ };
+ } ipv4;
+ struct {
+ struct {
+ struct in6_addr src; /* IPv6 source address. */
+ struct in6_addr dst; /* IPv6 destination address. */
+ } addr;
+ __be32 label; /* IPv6 flow label. */
+ u16 exthdrs; /* IPv6 extension header flags */
+ union {
+ struct {
+ struct in6_addr src;
+ struct in6_addr dst;
+ } ct_orig; /* Conntrack original direction fields. */
+ struct {
+ struct in6_addr target; /* ND target address. */
+ u8 sll[ETH_ALEN]; /* ND source link layer address. */
+ u8 tll[ETH_ALEN]; /* ND target link layer address. */
+ } nd;
+ };
+ } ipv6;
+ struct {
+ u32 num_labels_mask; /* labels present bitmap of effective length MPLS_LABEL_DEPTH */
+ __be32 lse[MPLS_LABEL_DEPTH]; /* label stack entry */
+ } mpls;
+
+ struct ovs_key_nsh nsh; /* network service header */
+ };
+ struct {
+ /* Connection tracking fields not packed above. */
+ struct {
+ __be16 src; /* CT orig tuple tp src port. */
+ __be16 dst; /* CT orig tuple tp dst port. */
+ } orig_tp;
+ u32 mark;
+ struct ovs_key_ct_labels labels;
+ } ct;
+
+} __aligned(BITS_PER_LONG/8); /* Ensure that we can do comparisons as longs. */
+
+static inline bool sw_flow_key_is_nd(const struct sw_flow_key *key)
+{
+ return key->eth.type == htons(ETH_P_IPV6) &&
+ key->ip.proto == NEXTHDR_ICMP &&
+ key->tp.dst == 0 &&
+ (key->tp.src == htons(NDISC_NEIGHBOUR_SOLICITATION) ||
+ key->tp.src == htons(NDISC_NEIGHBOUR_ADVERTISEMENT));
+}
+
+struct sw_flow_key_range {
+ unsigned short int start;
+ unsigned short int end;
+};
+
+struct sw_flow_mask {
+ int ref_count;
+ struct rcu_head rcu;
+ struct sw_flow_key_range range;
+ struct sw_flow_key key;
+};
+
+struct sw_flow_match {
+ struct sw_flow_key *key;
+ struct sw_flow_key_range range;
+ struct sw_flow_mask *mask;
+};
+
+#define MAX_UFID_LENGTH 16 /* 128 bits */
+
+struct sw_flow_id {
+ u32 ufid_len;
+ union {
+ u32 ufid[MAX_UFID_LENGTH / 4];
+ struct sw_flow_key *unmasked_key;
+ };
+};
+
+struct sw_flow_actions {
+ struct rcu_head rcu;
+ size_t orig_len; /* From flow_cmd_new netlink actions size */
+ u32 actions_len;
+ struct nlattr actions[];
+};
+
+struct sw_flow_stats {
+ u64 packet_count; /* Number of packets matched. */
+ u64 byte_count; /* Number of bytes matched. */
+ unsigned long used; /* Last used time (in jiffies). */
+ spinlock_t lock; /* Lock for atomic stats update. */
+ __be16 tcp_flags; /* Union of seen TCP flags. */
+};
+
+struct sw_flow {
+ struct rcu_head rcu;
+ struct {
+ struct hlist_node node[2];
+ u32 hash;
+ } flow_table, ufid_table;
+ int stats_last_writer; /* CPU id of the last writer on
+ * 'stats[0]'.
+ */
+ struct sw_flow_key key;
+ struct sw_flow_id id;
+ struct cpumask cpu_used_mask;
+ struct sw_flow_mask *mask;
+ struct sw_flow_actions __rcu *sf_acts;
+ struct sw_flow_stats __rcu *stats[]; /* One for each CPU. First one
+ * is allocated at flow creation time,
+ * the rest are allocated on demand
+ * while holding the 'stats[0].lock'.
+ */
+};
+
+struct arp_eth_header {
+ __be16 ar_hrd; /* format of hardware address */
+ __be16 ar_pro; /* format of protocol address */
+ unsigned char ar_hln; /* length of hardware address */
+ unsigned char ar_pln; /* length of protocol address */
+ __be16 ar_op; /* ARP opcode (command) */
+
+ /* Ethernet+IPv4 specific members. */
+ unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
+ unsigned char ar_sip[4]; /* sender IP address */
+ unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
+ unsigned char ar_tip[4]; /* target IP address */
+} __packed;
+
+static inline u8 ovs_key_mac_proto(const struct sw_flow_key *key)
+{
+ return key->mac_proto & ~SW_FLOW_KEY_INVALID;
+}
+
+static inline u16 __ovs_mac_header_len(u8 mac_proto)
+{
+ return mac_proto == MAC_PROTO_ETHERNET ? ETH_HLEN : 0;
+}
+
+static inline u16 ovs_mac_header_len(const struct sw_flow_key *key)
+{
+ return __ovs_mac_header_len(ovs_key_mac_proto(key));
+}
+
+static inline bool ovs_identifier_is_ufid(const struct sw_flow_id *sfid)
+{
+ return sfid->ufid_len;
+}
+
+static inline bool ovs_identifier_is_key(const struct sw_flow_id *sfid)
+{
+ return !ovs_identifier_is_ufid(sfid);
+}
+
+void ovs_flow_stats_update(struct sw_flow *, __be16 tcp_flags,
+ const struct sk_buff *);
+void ovs_flow_stats_get(const struct sw_flow *, struct ovs_flow_stats *,
+ unsigned long *used, __be16 *tcp_flags);
+void ovs_flow_stats_clear(struct sw_flow *);
+u64 ovs_flow_used_time(unsigned long flow_jiffies);
+
+int ovs_flow_key_update(struct sk_buff *skb, struct sw_flow_key *key);
+int ovs_flow_key_update_l3l4(struct sk_buff *skb, struct sw_flow_key *key);
+int ovs_flow_key_extract(const struct ip_tunnel_info *tun_info,
+ struct sk_buff *skb,
+ struct sw_flow_key *key);
+/* Extract key from packet coming from userspace. */
+int ovs_flow_key_extract_userspace(struct net *net, const struct nlattr *attr,
+ struct sk_buff *skb,
+ struct sw_flow_key *key, bool log);
+
+#endif /* flow.h */
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