X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=datapath%2Ftunnel.h;h=2bdfe914d3e38684d60c74fcf84a647d301c9136;hb=67680b012be30d9c26eab999b83b08c6eb32dbd2;hp=8ffb7bf544446f9b108b683f1ba3aa154ff693d9;hpb=842cf6f472b236b6e61be04b41970116245b1759;p=sliver-openvswitch.git diff --git a/datapath/tunnel.h b/datapath/tunnel.h index 8ffb7bf54..2bdfe914d 100644 --- a/datapath/tunnel.h +++ b/datapath/tunnel.h @@ -1,19 +1,30 @@ /* - * Copyright (c) 2010 Nicira Networks. - * Distributed under the terms of the GNU GPL version 2. + * Copyright (c) 2007-2012 Nicira, Inc. * - * Significant portions of this file may be copied from parts of the Linux - * kernel, by Linus Torvalds and others. + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public + * License as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA */ #ifndef TUNNEL_H #define TUNNEL_H 1 #include +#include +#include #include "flow.h" #include "openvswitch/tunnel.h" -#include "table.h" #include "vport.h" /* @@ -29,25 +40,79 @@ * identifiers. */ #define TNL_T_PROTO_GRE 0 -#define TNL_T_PROTO_CAPWAP 1 +#define TNL_T_PROTO_GRE64 1 +#define TNL_T_PROTO_VXLAN 3 +#define TNL_T_PROTO_LISP 4 /* These flags are only needed when calling tnl_find_port(). */ #define TNL_T_KEY_EXACT (1 << 10) #define TNL_T_KEY_MATCH (1 << 11) -#define TNL_T_KEY_EITHER (TNL_T_KEY_EXACT | TNL_T_KEY_MATCH) -struct tnl_mutable_config { - struct rcu_head rcu; +/* Private flags not exposed to userspace in this form. */ +#define TNL_F_IN_KEY_MATCH (1 << 16) /* Store the key in tun_id to + * match in flow table. */ +#define TNL_F_OUT_KEY_ACTION (1 << 17) /* Get the key from a SET_TUNNEL + * action. */ + +/* All public tunnel flags. */ +#define TNL_F_PUBLIC (TNL_F_CSUM | TNL_F_TOS_INHERIT | TNL_F_TTL_INHERIT | \ + TNL_F_DF_DEFAULT) + +/** + * struct port_lookup_key - Tunnel port key, used as hash table key. + * @in_key: Key to match on input, 0 for wildcard. + * @net: Network namespace of the port. + * @saddr: IPv4 source address to match, 0 to accept any source address. + * @daddr: IPv4 destination of tunnel. + * @tunnel_type: Set of TNL_T_* flags that define lookup. + */ +struct port_lookup_key { + __be64 in_key; +#ifdef CONFIG_NET_NS + struct net *net; +#endif + __be32 saddr; + __be32 daddr; + u32 tunnel_type; +}; - unsigned seq; /* Sequence number to identify this config. */ +#define PORT_KEY_LEN (offsetof(struct port_lookup_key, tunnel_type) + \ + FIELD_SIZEOF(struct port_lookup_key, tunnel_type)) - u32 tunnel_type; /* Set of TNL_T_* flags that define lookup. */ - unsigned tunnel_hlen; /* Tunnel header length. */ +static inline struct net *port_key_get_net(const struct port_lookup_key *key) +{ + return read_pnet(&key->net); +} + +static inline void port_key_set_net(struct port_lookup_key *key, struct net *net) +{ + write_pnet(&key->net, net); +} + +/** + * struct tnl_mutable_config - modifiable configuration for a tunnel. + * @key: Used as key for tunnel port. Configured via OVS_TUNNEL_ATTR_* + * attributes. + * @rcu: RCU callback head for deferred destruction. + * @tunnel_hlen: Tunnel header length. + * @out_key: Key to use on output, 0 if this tunnel has no fixed output key. + * @flags: TNL_F_* flags. + * @tos: IPv4 TOS value to use for tunnel, 0 if no fixed TOS. + * @ttl: IPv4 TTL value to use for tunnel, 0 if no fixed TTL. + */ +struct tnl_mutable_config { + struct port_lookup_key key; + struct rcu_head rcu; - unsigned char eth_addr[ETH_ALEN]; - unsigned mtu; + /* Configured via OVS_TUNNEL_ATTR_* attributes. */ + __be64 out_key; + u32 flags; + u8 tos; + u8 ttl; + __be16 dst_port; - struct tnl_port_config port_config; + /* Multicast configuration. */ + int mlink; }; struct tnl_ops { @@ -59,156 +124,92 @@ struct tnl_ops { * build_header() (i.e. excludes the IP header). Returns a negative * error code if the configuration is invalid. */ - int (*hdr_len)(const struct tnl_port_config *); - - /* - * Builds the static portion of the tunnel header, which is stored in - * the header cache. In general the performance of this function is - * not too important as we try to only call it when building the cache - * so it is preferable to shift as much work as possible here. However, - * in some circumstances caching is disabled and this function will be - * called for every packet, so try not to make it too slow. - */ - void (*build_header)(const struct vport *, - const struct tnl_mutable_config *, void *header); - + int (*hdr_len)(const struct tnl_mutable_config *, + const struct ovs_key_ipv4_tunnel *); /* - * Updates the cached header of a packet to match the actual packet - * data. Typical things that might need to be updated are length, - * checksum, etc. The IP header will have already been updated and this - * is the final step before transmission. Returns a linked list of - * completed SKBs (multiple packets may be generated in the event - * of fragmentation). + * Returns a linked list of SKBs with tunnel headers (multiple + * packets may be generated in the event of fragmentation). Space + * will have already been allocated at the start of the packet equal + * to sizeof(struct iphdr) + value returned by hdr_len(). The IP + * header will have already been constructed. */ - struct sk_buff *(*update_header)(const struct vport *, + struct sk_buff *(*build_header)(const struct vport *, const struct tnl_mutable_config *, - struct dst_entry *, struct sk_buff *); -}; - -#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,20) -/* - * On these kernels we have a fast mechanism to tell if the ARP cache for a - * particular destination has changed. - */ -#define HAVE_HH_SEQ -#endif -#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,27) -/* - * On these kernels we have a fast mechanism to tell if the routing table - * has changed. - */ -#define HAVE_RT_GENID -#endif -#if !defined(HAVE_HH_SEQ) || !defined(HAVE_RT_GENID) -/* If we can't detect all system changes directly we need to use a timeout. */ -#define NEED_CACHE_TIMEOUT -#endif -struct tnl_cache { - struct rcu_head rcu; - - int len; /* Length of data to be memcpy'd from cache. */ - - /* Sequence number of mutable->seq from which this cache was generated. */ - unsigned mutable_seq; - -#ifdef HAVE_HH_SEQ - /* - * The sequence number from the seqlock protecting the hardware header - * cache (in the ARP cache). Since every write increments the counter - * this gives us an easy way to tell if it has changed. - */ - unsigned hh_seq; -#endif - -#ifdef NEED_CACHE_TIMEOUT - /* - * If we don't have direct mechanisms to detect all important changes in - * the system fall back to an expiration time. This expiration time - * can be relatively short since at high rates there will be millions of - * packets per second, so we'll still get plenty of benefit from the - * cache. Note that if something changes we may blackhole packets - * until the expiration time (depending on what changed and the kernel - * version we may be able to detect the change sooner). Expiration is - * expressed as a time in jiffies. - */ - unsigned long expiration; -#endif - - /* - * The routing table entry that is the result of looking up the tunnel - * endpoints. It also contains a sequence number (called a generation - * ID) that can be compared to a global sequence to tell if the routing - * table has changed (and therefore there is a potential that this - * cached route has been invalidated). - */ - struct rtable *rt; - - /* - * If the output device for tunnel traffic is an OVS internal device, - * the flow of that datapath. Since all tunnel traffic will have the - * same headers this allows us to cache the flow lookup. NULL if the - * output device is not OVS or if there is no flow installed. - */ - struct sw_flow *flow; - - /* The cached header follows after padding for alignment. */ + struct dst_entry *, struct sk_buff *, + int tunnel_hlen); }; struct tnl_vport { struct rcu_head rcu; - struct tbl_node tbl_node; + struct hlist_node hash_node; char name[IFNAMSIZ]; const struct tnl_ops *tnl_ops; - struct tnl_mutable_config *mutable; /* Protected by RCU. */ + struct tnl_mutable_config __rcu *mutable; +}; - /* - * ID of last fragment sent (for tunnel protocols with direct support - * fragmentation). If the protocol relies on IP fragmentation then - * this is not needed. - */ - atomic_t frag_id; +struct vport *ovs_tnl_create(const struct vport_parms *, const struct vport_ops *, + const struct tnl_ops *); +void ovs_tnl_destroy(struct vport *); - spinlock_t cache_lock; - struct tnl_cache *cache; /* Protected by RCU/cache_lock. */ +int ovs_tnl_set_options(struct vport *, struct nlattr *); +int ovs_tnl_get_options(const struct vport *, struct sk_buff *); -#ifdef NEED_CACHE_TIMEOUT - /* - * If we must rely on expiration time to invalidate the cache, this is - * the interval. It is randomized within a range (defined by - * MAX_CACHE_EXP in tunnel.c) to avoid synchronized expirations caused - * by creation of a large number of tunnels at a one time. - */ - unsigned long cache_exp_interval; -#endif -}; +const char *ovs_tnl_get_name(const struct vport *vport); +int ovs_tnl_send(struct vport *vport, struct sk_buff *skb); +void ovs_tnl_rcv(struct vport *vport, struct sk_buff *skb); +u16 ovs_tnl_get_src_port(struct sk_buff *skb); -struct vport *tnl_create(const char *name, const void __user *config, - const struct vport_ops *, - const struct tnl_ops *); -int tnl_modify(struct vport *, const void __user *config); -int tnl_destroy(struct vport *); -int tnl_set_mtu(struct vport *vport, int mtu); -int tnl_set_addr(struct vport *vport, const unsigned char *addr); -const char *tnl_get_name(const struct vport *vport); -const unsigned char *tnl_get_addr(const struct vport *vport); -int tnl_get_mtu(const struct vport *vport); -int tnl_send(struct vport *vport, struct sk_buff *skb); -void tnl_rcv(struct vport *vport, struct sk_buff *skb); - -struct vport *tnl_find_port(__be32 saddr, __be32 daddr, __be32 key, - int tunnel_type, - const struct tnl_mutable_config **mutable); -bool tnl_frag_needed(struct vport *vport, - const struct tnl_mutable_config *mutable, - struct sk_buff *skb, unsigned int mtu, __be32 flow_key); -void tnl_free_linked_skbs(struct sk_buff *skb); +struct vport *ovs_tnl_find_port(struct net *net, __be32 saddr, __be32 daddr, + __be64 key, int tunnel_type, + const struct tnl_mutable_config **mutable); +bool ovs_tnl_frag_needed(struct vport *vport, + const struct tnl_mutable_config *mutable, + struct sk_buff *skb, unsigned int mtu); +void ovs_tnl_free_linked_skbs(struct sk_buff *skb); +int ovs_tnl_init(void); +void ovs_tnl_exit(void); static inline struct tnl_vport *tnl_vport_priv(const struct vport *vport) { return vport_priv(vport); } +static inline void tnl_tun_key_init(struct ovs_key_ipv4_tunnel *tun_key, + const struct iphdr *iph, __be64 tun_id, u32 tun_flags) +{ + tun_key->tun_id = tun_id; + tun_key->ipv4_src = iph->saddr; + tun_key->ipv4_dst = iph->daddr; + tun_key->ipv4_tos = iph->tos; + tun_key->ipv4_ttl = iph->ttl; + tun_key->tun_flags = tun_flags; + + /* clear struct padding. */ + memset((unsigned char*) tun_key + OVS_TUNNEL_KEY_SIZE, 0, + sizeof(*tun_key) - OVS_TUNNEL_KEY_SIZE); +} + +static inline void tnl_get_param(const struct tnl_mutable_config *mutable, + const struct ovs_key_ipv4_tunnel *tun_key, + u32 *flags, __be64 *out_key) +{ + if (tun_key->ipv4_dst) { + *flags = 0; + + if (tun_key->tun_flags & OVS_TNL_F_KEY) + *flags = TNL_F_OUT_KEY_ACTION; + if (tun_key->tun_flags & OVS_TNL_F_CSUM) + *flags |= TNL_F_CSUM; + *out_key = tun_key->tun_id; + } else { + *flags = mutable->flags; + if (mutable->flags & TNL_F_OUT_KEY_ACTION) + *out_key = tun_key->tun_id; + else + *out_key = mutable->out_key; + } +} #endif /* tunnel.h */