X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=datapath%2Ftunnel.h;h=17de7c47a8e7ace8b314e77f18cf6af3a938a7f1;hb=b0fb94a346e52f36aeef238dd5f9bef9a10c14ef;hp=8ffb7bf544446f9b108b683f1ba3aa154ff693d9;hpb=842cf6f472b236b6e61be04b41970116245b1759;p=sliver-openvswitch.git diff --git a/datapath/tunnel.h b/datapath/tunnel.h index 8ffb7bf54..17de7c47a 100644 --- a/datapath/tunnel.h +++ b/datapath/tunnel.h @@ -1,214 +1,60 @@ /* - * 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" -/* - * The absolute minimum fragment size. Note that there are many other - * definitions of the minimum MTU. - */ -#define IP_MIN_MTU 68 - -/* - * One of these goes in struct tnl_ops and in tnl_find_port(). - * These values are in the same namespace as other TNL_T_* values, so - * only the least significant 10 bits are available to define protocol - * identifiers. - */ -#define TNL_T_PROTO_GRE 0 -#define TNL_T_PROTO_CAPWAP 1 - -/* 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; +struct rtable *find_route(struct net *net, + __be32 *saddr, __be32 daddr, u8 ipproto, + u8 tos, u32 skb_mark); - unsigned seq; /* Sequence number to identify this config. */ +u16 ovs_tnl_get_src_port(struct sk_buff *skb); - u32 tunnel_type; /* Set of TNL_T_* flags that define lookup. */ - unsigned tunnel_hlen; /* Tunnel header length. */ +int ovs_tnl_send(struct vport *vport, struct sk_buff *skb, + u8 ipproto, int tunnel_hlen, + void (*build_header)(const struct vport *, + struct sk_buff *, + int tunnel_hlen)); - unsigned char eth_addr[ETH_ALEN]; - unsigned mtu; +void ovs_tnl_rcv(struct vport *vport, struct sk_buff *skb, + struct ovs_key_ipv4_tunnel *tun_key); - struct tnl_port_config port_config; -}; - -struct tnl_ops { - u32 tunnel_type; /* Put the TNL_T_PROTO_* type in here. */ - u8 ipproto; /* The IP protocol for the tunnel. */ - - /* - * Returns the length of the tunnel header that will be added in - * 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); - - /* - * 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). - */ - struct sk_buff *(*update_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 tnl_vport { - struct rcu_head rcu; - struct tbl_node tbl_node; - - char name[IFNAMSIZ]; - const struct tnl_ops *tnl_ops; - - struct tnl_mutable_config *mutable; /* Protected by RCU. */ - - /* - * 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; - - spinlock_t cache_lock; - struct tnl_cache *cache; /* Protected by RCU/cache_lock. */ - -#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 -}; - -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); - -static inline struct tnl_vport *tnl_vport_priv(const struct vport *vport) +static inline void tnl_tun_key_init(struct ovs_key_ipv4_tunnel *tun_key, + const struct iphdr *iph, __be64 tun_id, + __be16 tun_flags) { - return vport_priv(vport); + 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); } - -#endif /* tunnel.h */ +#endif /* TUNNEL_H */