/* * Copyright (c) 2016 Cisco and/or its affiliates. * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ /** * lb-plugin implements a MagLev-like load balancer. * http://research.google.com/pubs/pub44824.html * * It hasn't been tested for interoperability with the original MagLev * but intends to provide similar functionality. * The load-balancer receives traffic destined to VIP (Virtual IP) * addresses from one or multiple(ECMP) routers. * The load-balancer tunnels the traffic toward many application servers * ensuring session stickyness (i.e. that a single sessions is tunneled * towards a single application server). * */ #ifndef LB_PLUGIN_LB_LB_H_ #define LB_PLUGIN_LB_LB_H_ #include <lb/util.h> #include <vnet/util/refcount.h> #include <vnet/vnet.h> #include <vnet/ip/ip.h> #include <vnet/dpo/dpo.h> #include <vnet/fib/fib_table.h> #include <vppinfra/hash.h> #include <vppinfra/bihash_8_8.h> #include <vppinfra/bihash_24_8.h> #include <lb/lbhash.h> #define LB_DEFAULT_PER_CPU_STICKY_BUCKETS 1 << 10 #define LB_DEFAULT_FLOW_TIMEOUT 40 #define LB_MAPPING_BUCKETS 1024 #define LB_MAPPING_MEMORY_SIZE 64<<20 typedef enum { LB_NEXT_DROP, LB_N_NEXT, } lb_next_t; typedef enum { LB_NAT4_IN2OUT_NEXT_DROP, LB_NAT4_IN2OUT_NEXT_LOOKUP, LB_NAT4_IN2OUT_N_NEXT, } LB_nat4_in2out_next_t; typedef enum { LB_NAT6_IN2OUT_NEXT_DROP, LB_NAT6_IN2OUT_NEXT_LOOKUP, LB_NAT6_IN2OUT_N_NEXT, } LB_nat6_in2out_next_t; #define foreach_lb_nat_in2out_error \ _(UNSUPPORTED_PROTOCOL, "Unsupported protocol") \ _(IN2OUT_PACKETS, "Good in2out packets processed") \ _(NO_TRANSLATION, "No translation") typedef enum { #define _(sym,str) LB_NAT_IN2OUT_ERROR_##sym, foreach_lb_nat_in2out_error #undef _ LB_NAT_IN2OUT_N_ERROR, } lb_nat_in2out_error_t; /** * lb for kube-proxy supports three types of service */ typedef enum { LB_SRV_TYPE_CLUSTERIP, LB_SRV_TYPE_NODEPORT, LB_SRV_N_TYPES, } lb_svr_type_t; typedef enum { LB4_NODEPORT_NEXT_IP4_NAT4, LB4_NODEPORT_NEXT_DROP, LB4_NODEPORT_N_NEXT, } lb4_nodeport_next_t; typedef enum { LB6_NODEPORT_NEXT_IP6_NAT6, LB6_NODEPORT_NEXT_DROP, LB6_NODEPORT_N_NEXT, } lb6_nodeport_next_t; /** * Each VIP is configured with a set of * application server. */ typedef struct { /** * Registration to FIB event. */ fib_node_t fib_node; /** * Destination address used to tunnel traffic towards * that application server. * The address is also used as ID and pseudo-random * seed for the load-balancing process. */ ip46_address_t address; /** * ASs are indexed by address and VIP Index. * Which means there will be duplicated if the same server * address is used for multiple VIPs. */ u32 vip_index; /** * Some per-AS flags. * For now only LB_AS_FLAGS_USED is defined. */ u8 flags; #define LB_AS_FLAGS_USED 0x1 /** * Rotating timestamp of when LB_AS_FLAGS_USED flag was last set. * * AS removal is based on garbage collection and reference counting. * When an AS is removed, there is a race between configuration core * and worker cores which may still add a reference while it should not * be used. This timestamp is used to not remove the AS while a race condition * may happen. */ u32 last_used; /** * The FIB entry index for the next-hop */ fib_node_index_t next_hop_fib_entry_index; /** * The child index on the FIB entry */ u32 next_hop_child_index; /** * The next DPO in the graph to follow. */ dpo_id_t dpo; } lb_as_t; format_function_t format_lb_as; typedef struct { u32 as_index; } lb_new_flow_entry_t; #define lb_foreach_vip_counter \ _(NEXT_PACKET, "packet from existing sessions", 0) \ _(FIRST_PACKET, "first session packet", 1) \ _(UNTRACKED_PACKET, "untracked packet", 2) \ _(NO_SERVER, "no server configured", 3) typedef enum { #define _(a,b,c) LB_VIP_COUNTER_##a = c, lb_foreach_vip_counter #undef _ LB_N_VIP_COUNTERS } lb_vip_counter_t; typedef enum { LB_ENCAP_TYPE_GRE4, LB_ENCAP_TYPE_GRE6, LB_ENCAP_TYPE_L3DSR, LB_ENCAP_TYPE_NAT4, LB_ENCAP_TYPE_NAT6, LB_ENCAP_N_TYPES, } lb_encap_type_t; /** * The load balancer supports IPv4 and IPv6 traffic * and GRE4, GRE6, L3DSR and NAT4, NAT6 encap. */ typedef enum { LB_VIP_TYPE_IP6_GRE6, LB_VIP_TYPE_IP6_GRE4, LB_VIP_TYPE_IP4_GRE6, LB_VIP_TYPE_IP4_GRE4, LB_VIP_TYPE_IP4_L3DSR, LB_VIP_TYPE_IP4_NAT4, LB_VIP_TYPE_IP6_NAT6, LB_VIP_N_TYPES, } lb_vip_type_t; format_function_t format_lb_vip_type; unformat_function_t unformat_lb_vip_type; /* args for different vip encap types */ typedef struct { union { struct { /* Service type. clusterip or nodeport */ u8 srv_type; /* Service port. network byte order */ u16 port; /* Pod's port corresponding to specific service. network byte order */ u16 target_port; /* Node's port, can access service via NodeIP:node_port. network byte order */ u16 node_port; }; /* DSCP bits for L3DSR */ u8 dscp; u64 as_u64; }; } lb_vip_encap_args_t; /** * Load balancing service is provided per VIP. * In this data model, a VIP can be a whole prefix. * But load balancing only * occurs on a per-source-address/port basis. Meaning that if a given source * reuses the same port for multiple destinations within the same VIP, * they will be considered as a single flow. */ typedef struct { //Runtime /** * Vector mapping (flow-hash & new_connect_table_mask) to AS index. * This is used for new flows. */ lb_new_flow_entry_t *new_flow_table; /** * New flows table length - 1 * (length MUST be a power of 2) */ u32 new_flow_table_mask; /** * Last time garbage collection was run to free the ASs. */ u32 last_garbage_collection; //Not runtime /** * A Virtual IP represents a given service delivered * by a set of application servers. It can be a single * address or a prefix. * IPv4 prefixes are encoded using IPv4-in-IPv6 embedded address * (i.e. ::/96 prefix). */ ip46_address_t prefix; /** * The VIP prefix length. * In case of IPv4, plen = 96 + ip4_plen. */ u8 plen; /** * The type of traffic for this. * LB_TYPE_UNDEFINED if unknown. */ lb_vip_type_t type; /* args for different vip encap types */ lb_vip_encap_args_t encap_args; /** * Flags related to this VIP. * LB_VIP_FLAGS_USED means the VIP is active. * When it is not set, the VIP in the process of being removed. * We cannot immediately remove a VIP because the VIP index still may be stored * in the adjacency index. */ u8 flags; #define LB_VIP_FLAGS_USED 0x1 /** * Pool of AS indexes used for this VIP. * This also includes ASs that have been removed (but are still referenced). */ u32 *as_indexes; } lb_vip_t; #define lb_vip_is_ip4(vip) ((vip)->type == LB_VIP_TYPE_IP4_GRE6 \ || (vip)->type == LB_VIP_TYPE_IP4_GRE4 \ || (vip)->type == LB_VIP_TYPE_IP4_L3DSR \ || (vip)->type == LB_VIP_TYPE_IP4_NAT4 ) #define lb_vip_is_gre4(vip) ((vip)->type == LB_VIP_TYPE_IP6_GRE4 \ || (vip)->type == LB_VIP_TYPE_IP4_GRE4) #define lb_vip_is_gre6(vip) ((vip)->type == LB_VIP_TYPE_IP6_GRE6 \ || (vip)->type == LB_VIP_TYPE_IP4_GRE6) #define lb_vip_is_l3dsr(vip) ((vip)->type == LB_VIP_TYPE_IP4_L3DSR) #define lb_vip_is_nat4(vip) ((vip)->type == LB_VIP_TYPE_IP4_NAT4) #define lb_vip_is_nat6(vip) ((vip)->type == LB_VIP_TYPE_IP6_NAT6) #define lb_encap_is_ip4(vip) ((vip)->type == LB_VIP_TYPE_IP6_GRE4 \ || (vip)->type == LB_VIP_TYPE_IP4_GRE4 \ || (vip)->type == LB_VIP_TYPE_IP4_L3DSR \ || (vip)->type == LB_VIP_TYPE_IP4_NAT4 ) format_function_t format_lb_vip; format_function_t format_lb_vip_detailed; #define foreach_lb_nat_protocol \ _(UDP, 0, udp, "udp") \ _(TCP, 1, tcp, "tcp") typedef enum { #define _(N, i, n, s) LB_NAT_PROTOCOL_##N = i, foreach_lb_nat_protocol #undef _ } lb_nat_protocol_t; always_inline u32 lb_ip_proto_to_nat_proto (u8 ip_proto) { u32 nat_proto = ~0; nat_proto = (ip_proto == IP_PROTOCOL_UDP) ? LB_NAT_PROTOCOL_UDP : nat_proto; nat_proto = (ip_proto == IP_PROTOCOL_TCP) ? LB_NAT_PROTOCOL_TCP : nat_proto; return nat_proto; } /* Key for Pod's egress SNAT */ typedef struct { union { struct { ip4_address_t addr; u16 port; u16 protocol:3, fib_index:13; }; u64 as_u64; }; } lb_snat4_key_t; typedef struct { union { struct { ip6_address_t addr; u16 port; u16 protocol; u32 fib_index; }; u64 as_u64[3]; }; } lb_snat6_key_t; typedef struct { /** * for vip + port case, src_ip = vip; * for node ip + node_port, src_ip = node_ip */ ip46_address_t src_ip; ip46_address_t as_ip; u8 src_ip_is_ipv6; u8 as_ip_is_ipv6; /** * Network byte order * for vip + port case, src_port = port; * for node ip + node_port, src_port = node_port */ u16 src_port; u16 target_port; /* Network byte order */ u32 vrf_id; u32 fib_index; } lb_snat_mapping_t; typedef struct { /** * Each CPU has its own sticky flow hash table. * One single table is used for all VIPs. */ lb_hash_t *sticky_ht; } lb_per_cpu_t; typedef struct { /** * Pool of all Virtual IPs */ lb_vip_t *vips; /** * Pool of ASs. * ASs are referenced by address and vip index. * The first element (index 0) is special and used only to fill * new_flow_tables when no AS has been configured. */ lb_as_t *ass; /** * Each AS has an associated reference counter. * As ass[0] has a special meaning, its associated counter * starts at 0 and is decremented instead. i.e. do not use it. */ vlib_refcount_t as_refcount; /* hash lookup vip_index by key: {u16: nodeport} */ uword * vip_index_by_nodeport; /** * Some global data is per-cpu */ lb_per_cpu_t *per_cpu; /** * Node next index for IP adjacencies, for each of the traffic types. */ u32 ip_lookup_next_index[LB_VIP_N_TYPES]; /** * Source address used in IPv6 encapsulated traffic */ ip6_address_t ip6_src_address; /** * Source address used for IPv4 encapsulated traffic */ ip4_address_t ip4_src_address; /** * Number of buckets in the per-cpu sticky hash table. */ u32 per_cpu_sticky_buckets; /** * Flow timeout in seconds. */ u32 flow_timeout; /** * Per VIP counter */ vlib_simple_counter_main_t vip_counters[LB_N_VIP_COUNTERS]; /** * DPO used to send packet from IP4/6 lookup to LB node. */ dpo_type_t dpo_gre4_type; dpo_type_t dpo_gre6_type; dpo_type_t dpo_l3dsr_type; dpo_type_t dpo_nat4_type; dpo_type_t dpo_nat6_type; /** * Node type for registering to fib changes. */ fib_node_type_t fib_node_type; /* Find a static mapping by AS IP : target_port */ clib_bihash_8_8_t mapping_by_as4; clib_bihash_24_8_t mapping_by_as6; /* Static mapping pool */ lb_snat_mapping_t * snat_mappings; /** * API dynamically registered base ID. */ u16 msg_id_base; volatile u32 *writer_lock; /* convenience */ vlib_main_t *vlib_main; vnet_main_t *vnet_main; } lb_main_t; /* args for different vip encap types */ typedef struct { ip46_address_t prefix; u8 plen; lb_vip_type_t type; u32 new_length; lb_vip_encap_args_t encap_args; } lb_vip_add_args_t; extern lb_main_t lb_main; extern vlib_node_registration_t lb4_node; extern vlib_node_registration_t lb6_node; extern vlib_node_registration_t lb4_nodeport_node; extern vlib_node_registration_t lb6_nodeport_node; extern vlib_node_registration_t lb_nat4_in2out_node; extern vlib_node_registration_t lb_nat6_in2out_node; /** * Fix global load-balancer parameters. * @param ip4_address IPv4 source address used for encapsulated traffic * @param ip6_address IPv6 source address used for encapsulated traffic * @return 0 on success. VNET_LB_ERR_XXX on error */ int lb_conf(ip4_address_t *ip4_address, ip6_address_t *ip6_address, u32 sticky_buckets, u32 flow_timeout); int lb_vip_add(lb_vip_add_args_t args, u32 *vip_index); int lb_vip_del(u32 vip_index); int lb_vip_find_index(ip46_address_t *prefix, u8 plen, u32 *vip_index); #define lb_vip_get_by_index(index) (pool_is_free_index(lb_main.vips, index)?NULL:pool_elt_at_index(lb_main.vips, index)) int lb_vip_add_ass(u32 vip_index, ip46_address_t *addresses, u32 n); int lb_vip_del_ass(u32 vip_index, ip46_address_t *addresses, u32 n); u32 lb_hash_time_now(vlib_main_t * vm); void lb_garbage_collection(); int lb_nat4_interface_add_del (u32 sw_if_index, int is_del); int lb_nat6_interface_add_del (u32 sw_if_index, int is_del); format_function_t format_lb_main; #endif /* LB_PLUGIN_LB_LB_H_ */