/* * 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. */ #include #include #include #include #include #include //GC runs at most once every so many seconds #define LB_GARBAGE_RUN 60 //After so many seconds. It is assumed that inter-core race condition will not occur. #define LB_CONCURRENCY_TIMEOUT 10 // FIB source for adding routes static fib_source_t lb_fib_src; lb_main_t lb_main; #define lb_get_writer_lock() clib_spinlock_lock (&lb_main.writer_lock) #define lb_put_writer_lock() clib_spinlock_unlock (&lb_main.writer_lock) static void lb_as_stack (lb_as_t *as); const static char * const lb_dpo_gre4_ip4[] = { "lb4-gre4" , NULL }; const static char * const lb_dpo_gre4_ip6[] = { "lb6-gre4" , NULL }; const static char* const * const lb_dpo_gre4_nodes[DPO_PROTO_NUM] = { [DPO_PROTO_IP4] = lb_dpo_gre4_ip4, [DPO_PROTO_IP6] = lb_dpo_gre4_ip6, }; const static char * const lb_dpo_gre6_ip4[] = { "lb4-gre6" , NULL }; const static char * const lb_dpo_gre6_ip6[] = { "lb6-gre6" , NULL }; const static char* const * const lb_dpo_gre6_nodes[DPO_PROTO_NUM] = { [DPO_PROTO_IP4] = lb_dpo_gre6_ip4, [DPO_PROTO_IP6] = lb_dpo_gre6_ip6, }; const static char * const lb_dpo_gre4_ip4_port[] = { "lb4-gre4-port" , NULL }; const static char * const lb_dpo_gre4_ip6_port[] = { "lb6-gre4-port" , NULL }; const static char* const * const lb_dpo_gre4_port_nodes[DPO_PROTO_NUM] = { [DPO_PROTO_IP4] = lb_dpo_gre4_ip4_port, [DPO_PROTO_IP6] = lb_dpo_gre4_ip6_port, }; const static char * const lb_dpo_gre6_ip4_port[] = { "lb4-gre6-port" , NULL }; const static char * const lb_dpo_gre6_ip6_port[] = { "lb6-gre6-port" , NULL }; const static char* const * const lb_dpo_gre6_port_nodes[DPO_PROTO_NUM] = { [DPO_PROTO_IP4] = lb_dpo_gre6_ip4_port, [DPO_PROTO_IP6] = lb_dpo_gre6_ip6_port, }; const static char * const lb_dpo_l3dsr_ip4[] = {"lb4-l3dsr" , NULL}; const static char* const * const lb_dpo_l3dsr_nodes[DPO_PROTO_NUM] = { [DPO_PROTO_IP4] = lb_dpo_l3dsr_ip4, }; const static char * const lb_dpo_l3dsr_ip4_port[] = {"lb4-l3dsr-port" , NULL}; const static char* const * const lb_dpo_l3dsr_port_nodes[DPO_PROTO_NUM] = { [DPO_PROTO_IP4] = lb_dpo_l3dsr_ip4_port, }; const static char * const lb_dpo_nat4_ip4_port[] = { "lb4-nat4-port" , NULL }; const static char* const * const lb_dpo_nat4_port_nodes[DPO_PROTO_NUM] = { [DPO_PROTO_IP4] = lb_dpo_nat4_ip4_port, }; const static char * const lb_dpo_nat6_ip6_port[] = { "lb6-nat6-port" , NULL }; const static char* const * const lb_dpo_nat6_port_nodes[DPO_PROTO_NUM] = { [DPO_PROTO_IP6] = lb_dpo_nat6_ip6_port, }; u32 lb_hash_time_now(vlib_main_t * vm) { return (u32) (vlib_time_now(vm) + 10000); } u8 *format_lb_main (u8 * s, va_list * args) { vlib_thread_main_t *tm = vlib_get_thread_main(); lb_main_t *lbm = &lb_main; s = format(s, "lb_main"); s = format(s, " ip4-src-address: %U \n", format_ip4_address, &lbm->ip4_src_address); s = format(s, " ip6-src-address: %U \n", format_ip6_address, &lbm->ip6_src_address); s = format(s, " #vips: %u\n", pool_elts(lbm->vips)); s = format(s, " #ass: %u\n", pool_elts(lbm->ass) - 1); u32 thread_index; for(thread_index = 0; thread_index < tm->n_vlib_mains; thread_index++ ) { lb_hash_t *h = lbm->per_cpu[thread_index].sticky_ht; if (h) { s = format(s, "core %d\n", thread_index); s = format(s, " timeout: %ds\n", h->timeout); s = format(s, " usage: %d / %d\n", lb_hash_elts(h, lb_hash_time_now(vlib_get_main())), lb_hash_size(h)); } } return s; } static char *lb_vip_type_strings[] = { [LB_VIP_TYPE_IP6_GRE6] = "ip6-gre6", [LB_VIP_TYPE_IP6_GRE4] = "ip6-gre4", [LB_VIP_TYPE_IP4_GRE6] = "ip4-gre6", [LB_VIP_TYPE_IP4_GRE4] = "ip4-gre4", [LB_VIP_TYPE_IP4_L3DSR] = "ip4-l3dsr", [LB_VIP_TYPE_IP4_NAT4] = "ip4-nat4", [LB_VIP_TYPE_IP6_NAT6] = "ip6-nat6", }; u8 *format_lb_vip_type (u8 * s, va_list * args) { lb_vip_type_t vipt = va_arg (*args, lb_vip_type_t); u32 i; for (i=0; itype, format_ip46_prefix, &vip->prefix, vip->plen, IP46_TYPE_ANY, vip->new_flow_table_mask + 1, pool_elts(vip->as_indexes), (vip->flags & LB_VIP_FLAGS_USED)?"":" removed"); if (vip->port != 0) { s = format(s, " protocol:%u port:%u ", vip->protocol, vip->port); } if (vip->type == LB_VIP_TYPE_IP4_L3DSR) { s = format(s, " dscp:%u", vip->encap_args.dscp); } else if ((vip->type == LB_VIP_TYPE_IP4_NAT4) || (vip->type == LB_VIP_TYPE_IP6_NAT6)) { s = format (s, " type:%s port:%u target_port:%u", (vip->encap_args.srv_type == LB_SRV_TYPE_CLUSTERIP)?"clusterip": "nodeport", ntohs(vip->port), ntohs(vip->encap_args.target_port)); } return s; } u8 *format_lb_as (u8 * s, va_list * args) { lb_as_t *as = va_arg (*args, lb_as_t *); return format(s, "%U %s", format_ip46_address, &as->address, IP46_TYPE_ANY, (as->flags & LB_AS_FLAGS_USED)?"used":"removed"); } u8 *format_lb_vip_detailed (u8 * s, va_list * args) { lb_main_t *lbm = &lb_main; lb_vip_t *vip = va_arg (*args, lb_vip_t *); u32 indent = format_get_indent (s); /* clang-format off */ s = format(s, "%U %U [%lu] %U%s%s\n" "%U new_size:%u\n", format_white_space, indent, format_lb_vip_type, vip->type, vip - lbm->vips, format_ip46_prefix, &vip->prefix, (u32) vip->plen, IP46_TYPE_ANY, lb_vip_is_src_ip_sticky (vip) ? " src_ip_sticky" : "", (vip->flags & LB_VIP_FLAGS_USED)?"":" removed", format_white_space, indent, vip->new_flow_table_mask + 1); /* clang-format on */ if (vip->port != 0) { s = format(s, "%U protocol:%u port:%u\n", format_white_space, indent, vip->protocol, vip->port); } if (vip->type == LB_VIP_TYPE_IP4_L3DSR) { s = format(s, "%U dscp:%u\n", format_white_space, indent, vip->encap_args.dscp); } else if ((vip->type == LB_VIP_TYPE_IP4_NAT4) || (vip->type == LB_VIP_TYPE_IP6_NAT6)) { s = format (s, "%U type:%s port:%u target_port:%u", format_white_space, indent, (vip->encap_args.srv_type == LB_SRV_TYPE_CLUSTERIP)?"clusterip": "nodeport", ntohs(vip->port), ntohs(vip->encap_args.target_port)); } //Print counters s = format(s, "%U counters:\n", format_white_space, indent); u32 i; for (i=0; ivip_counters[i].name, vlib_get_simple_counter(&lbm->vip_counters[i], vip - lbm->vips)); s = format(s, "%U #as:%u\n", format_white_space, indent, pool_elts(vip->as_indexes)); //Let's count the buckets for each AS u32 *count = 0; vec_validate(count, pool_len(lbm->ass)); //Possibly big alloc for not much... lb_new_flow_entry_t *nfe; vec_foreach(nfe, vip->new_flow_table) count[nfe->as_index]++; lb_as_t *as; u32 *as_index; pool_foreach (as_index, vip->as_indexes) { as = &lbm->ass[*as_index]; s = format(s, "%U %U %u buckets %Lu flows dpo:%u %s\n", format_white_space, indent, format_ip46_address, &as->address, IP46_TYPE_ANY, count[as - lbm->ass], vlib_refcount_get(&lbm->as_refcount, as - lbm->ass), as->dpo.dpoi_index, (as->flags & LB_AS_FLAGS_USED)?"used":" removed"); } vec_free(count); return s; } typedef struct { u32 as_index; u32 last; u32 skip; } lb_pseudorand_t; static int lb_pseudorand_compare(void *a, void *b) { lb_as_t *asa, *asb; lb_main_t *lbm = &lb_main; asa = &lbm->ass[((lb_pseudorand_t *)a)->as_index]; asb = &lbm->ass[((lb_pseudorand_t *)b)->as_index]; return memcmp(&asa->address, &asb->address, sizeof(asb->address)); } static void lb_vip_garbage_collection(lb_vip_t *vip) { lb_main_t *lbm = &lb_main; lb_snat4_key_t m_key4; clib_bihash_kv_8_8_t kv4, value4; lb_snat6_key_t m_key6; clib_bihash_kv_24_8_t kv6, value6; lb_snat_mapping_t *m = 0; CLIB_SPINLOCK_ASSERT_LOCKED (&lbm->writer_lock); u32 now = (u32) vlib_time_now(vlib_get_main()); if (!clib_u32_loop_gt(now, vip->last_garbage_collection + LB_GARBAGE_RUN)) return; vip->last_garbage_collection = now; lb_as_t *as; u32 *as_index; pool_foreach (as_index, vip->as_indexes) { as = &lbm->ass[*as_index]; if (!(as->flags & LB_AS_FLAGS_USED) && //Not used clib_u32_loop_gt(now, as->last_used + LB_CONCURRENCY_TIMEOUT) && (vlib_refcount_get(&lbm->as_refcount, as - lbm->ass) == 0)) { //Not referenced if (lb_vip_is_nat4_port(vip)) { m_key4.addr = as->address.ip4; m_key4.port = vip->encap_args.target_port; m_key4.protocol = 0; m_key4.fib_index = 0; kv4.key = m_key4.as_u64; if(!clib_bihash_search_8_8(&lbm->mapping_by_as4, &kv4, &value4)) m = pool_elt_at_index (lbm->snat_mappings, value4.value); ASSERT (m); kv4.value = m - lbm->snat_mappings; clib_bihash_add_del_8_8(&lbm->mapping_by_as4, &kv4, 0); pool_put (lbm->snat_mappings, m); } else if (lb_vip_is_nat6_port(vip)) { m_key6.addr.as_u64[0] = as->address.ip6.as_u64[0]; m_key6.addr.as_u64[1] = as->address.ip6.as_u64[1]; m_key6.port = vip->encap_args.target_port; m_key6.protocol = 0; m_key6.fib_index = 0; kv6.key[0] = m_key6.as_u64[0]; kv6.key[1] = m_key6.as_u64[1]; kv6.key[2] = m_key6.as_u64[2]; if (!clib_bihash_search_24_8 (&lbm->mapping_by_as6, &kv6, &value6)) m = pool_elt_at_index (lbm->snat_mappings, value6.value); ASSERT (m); kv6.value = m - lbm->snat_mappings; clib_bihash_add_del_24_8(&lbm->mapping_by_as6, &kv6, 0); pool_put (lbm->snat_mappings, m); } fib_entry_child_remove(as->next_hop_fib_entry_index, as->next_hop_child_index); fib_table_entry_delete_index(as->next_hop_fib_entry_index, FIB_SOURCE_RR); as->next_hop_fib_entry_index = FIB_NODE_INDEX_INVALID; pool_put(vip->as_indexes, as_index); pool_put(lbm->ass, as); } } } void lb_garbage_collection() { lb_main_t *lbm = &lb_main; lb_get_writer_lock(); lb_vip_t *vip; u32 *to_be_removed_vips = 0, *i; pool_foreach (vip, lbm->vips) { lb_vip_garbage_collection(vip); if (!(vip->flags & LB_VIP_FLAGS_USED) && (pool_elts(vip->as_indexes) == 0)) { vec_add1(to_be_removed_vips, vip - lbm->vips); } } vec_foreach(i, to_be_removed_vips) { vip = &lbm->vips[*i]; pool_free (vip->as_indexes); pool_put (lbm->vips, vip); } vec_free(to_be_removed_vips); lb_put_writer_lock(); } static void lb_vip_update_new_flow_table(lb_vip_t *vip) { lb_main_t *lbm = &lb_main; lb_new_flow_entry_t *old_table; u32 i, *as_index; lb_new_flow_entry_t *new_flow_table = 0; lb_as_t *as; lb_pseudorand_t *pr, *sort_arr = 0; CLIB_SPINLOCK_ASSERT_LOCKED (&lbm->writer_lock); // We must have the lock //Check if some AS is configured or not i = 0; pool_foreach (as_index, vip->as_indexes) { as = &lbm->ass[*as_index]; if (as->flags & LB_AS_FLAGS_USED) { //Not used anymore i = 1; goto out; //Not sure 'break' works in this macro-loop } } out: if (i == 0) { //Only the default. i.e. no AS vec_validate(new_flow_table, vip->new_flow_table_mask); for (i=0; ias_indexes) - 1); i = 0; pool_foreach (as_index, vip->as_indexes) { as = &lbm->ass[*as_index]; if (!(as->flags & LB_AS_FLAGS_USED)) //Not used anymore continue; sort_arr[i].as_index = as - lbm->ass; i++; } vec_set_len (sort_arr, i); vec_sort_with_function(sort_arr, lb_pseudorand_compare); //Now let's pseudo-randomly generate permutations vec_foreach(pr, sort_arr) { lb_as_t *as = &lbm->ass[pr->as_index]; u64 seed = clib_xxhash(as->address.as_u64[0] ^ as->address.as_u64[1]); /* We have 2^n buckets. * skip must be prime with 2^n. * So skip must be odd. * MagLev actually state that M should be prime, * but this has a big computation cost (% operation). * Using 2^n is more better (& operation). */ pr->skip = ((seed & 0xffffffff) | 1) & vip->new_flow_table_mask; pr->last = (seed >> 32) & vip->new_flow_table_mask; } //Let's create a new flow table vec_validate(new_flow_table, vip->new_flow_table_mask); for (i=0; ilast; pr->last = (pr->last + pr->skip) & vip->new_flow_table_mask; if (new_flow_table[last].as_index == 0) { new_flow_table[last].as_index = pr->as_index; break; } } done++; if (done == vec_len(new_flow_table)) goto finished; } } finished: vec_free(sort_arr); old_table = vip->new_flow_table; vip->new_flow_table = new_flow_table; vec_free(old_table); } int lb_conf(ip4_address_t *ip4_address, ip6_address_t *ip6_address, u32 per_cpu_sticky_buckets, u32 flow_timeout) { lb_main_t *lbm = &lb_main; if (!is_pow2(per_cpu_sticky_buckets)) return VNET_API_ERROR_INVALID_MEMORY_SIZE; lb_get_writer_lock(); //Not exactly necessary but just a reminder that it exists for my future self lbm->ip4_src_address = *ip4_address; lbm->ip6_src_address = *ip6_address; lbm->per_cpu_sticky_buckets = per_cpu_sticky_buckets; lbm->flow_timeout = flow_timeout; lb_put_writer_lock(); return 0; } static int lb_vip_port_find_index(ip46_address_t *prefix, u8 plen, u8 protocol, u16 port, lb_lkp_type_t lkp_type, u32 *vip_index) { lb_main_t *lbm = &lb_main; lb_vip_t *vip; /* This must be called with the lock owned */ CLIB_SPINLOCK_ASSERT_LOCKED (&lbm->writer_lock); ip46_prefix_normalize(prefix, plen); pool_foreach (vip, lbm->vips) { if ((vip->flags & LB_AS_FLAGS_USED) && vip->plen == plen && vip->prefix.as_u64[0] == prefix->as_u64[0] && vip->prefix.as_u64[1] == prefix->as_u64[1]) { if((lkp_type == LB_LKP_SAME_IP_PORT && vip->protocol == protocol && vip->port == port) || (lkp_type == LB_LKP_ALL_PORT_IP && vip->port == 0) || (lkp_type == LB_LKP_DIFF_IP_PORT && (vip->protocol != protocol || vip->port != port) ) ) { *vip_index = vip - lbm->vips; return 0; } } } return VNET_API_ERROR_NO_SUCH_ENTRY; } static int lb_vip_port_find_index_with_lock(ip46_address_t *prefix, u8 plen, u8 protocol, u16 port, u32 *vip_index) { return lb_vip_port_find_index(prefix, plen, protocol, port, LB_LKP_SAME_IP_PORT, vip_index); } static int lb_vip_port_find_all_port_vip(ip46_address_t *prefix, u8 plen, u32 *vip_index) { return lb_vip_port_find_index(prefix, plen, ~0, 0, LB_LKP_ALL_PORT_IP, vip_index); } /* Find out per-port-vip entry with different protocol and port */ static int lb_vip_port_find_diff_port(ip46_address_t *prefix, u8 plen, u8 protocol, u16 port, u32 *vip_index) { return lb_vip_port_find_index(prefix, plen, protocol, port, LB_LKP_DIFF_IP_PORT, vip_index); } int lb_vip_find_index(ip46_address_t *prefix, u8 plen, u8 protocol, u16 port, u32 *vip_index) { int ret; lb_get_writer_lock(); ret = lb_vip_port_find_index_with_lock(prefix, plen, protocol, port, vip_index); lb_put_writer_lock(); return ret; } static int lb_as_find_index_vip(lb_vip_t *vip, ip46_address_t *address, u32 *as_index) { lb_main_t *lbm = &lb_main; /* This must be called with the lock owned */ CLIB_SPINLOCK_ASSERT_LOCKED (&lbm->writer_lock); lb_as_t *as; u32 *asi; pool_foreach (asi, vip->as_indexes) { as = &lbm->ass[*asi]; if (as->vip_index == (vip - lbm->vips) && as->address.as_u64[0] == address->as_u64[0] && as->address.as_u64[1] == address->as_u64[1]) { *as_index = as - lbm->ass; return 0; } } return -1; } int lb_vip_add_ass(u32 vip_index, ip46_address_t *addresses, u32 n) { lb_main_t *lbm = &lb_main; lb_get_writer_lock(); lb_vip_t *vip; if (!(vip = lb_vip_get_by_index(vip_index))) { lb_put_writer_lock(); return VNET_API_ERROR_NO_SUCH_ENTRY; } ip46_type_t type = lb_encap_is_ip4(vip)?IP46_TYPE_IP4:IP46_TYPE_IP6; u32 *to_be_added = 0; u32 *to_be_updated = 0; u32 i; u32 *ip; lb_snat_mapping_t *m; //Sanity check while (n--) { if (!lb_as_find_index_vip(vip, &addresses[n], &i)) { if (lbm->ass[i].flags & LB_AS_FLAGS_USED) { vec_free(to_be_added); vec_free(to_be_updated); lb_put_writer_lock(); return VNET_API_ERROR_VALUE_EXIST; } vec_add1(to_be_updated, i); goto next; } if (ip46_address_type(&addresses[n]) != type) { vec_free(to_be_added); vec_free(to_be_updated); lb_put_writer_lock(); return VNET_API_ERROR_INVALID_ADDRESS_FAMILY; } if (n) { u32 n2 = n; while(n2--) //Check for duplicates if (addresses[n2].as_u64[0] == addresses[n].as_u64[0] && addresses[n2].as_u64[1] == addresses[n].as_u64[1]) goto next; } vec_add1(to_be_added, n); next: continue; } //Update reused ASs vec_foreach(ip, to_be_updated) { lbm->ass[*ip].flags = LB_AS_FLAGS_USED; } vec_free(to_be_updated); //Create those who have to be created vec_foreach(ip, to_be_added) { lb_as_t *as; u32 *as_index; pool_get(lbm->ass, as); as->address = addresses[*ip]; as->flags = LB_AS_FLAGS_USED; as->vip_index = vip_index; pool_get(vip->as_indexes, as_index); *as_index = as - lbm->ass; /* * become a child of the FIB entry * so we are informed when its forwarding changes */ fib_prefix_t nh = {}; if (lb_encap_is_ip4(vip)) { nh.fp_addr.ip4 = as->address.ip4; nh.fp_len = 32; nh.fp_proto = FIB_PROTOCOL_IP4; } else { nh.fp_addr.ip6 = as->address.ip6; nh.fp_len = 128; nh.fp_proto = FIB_PROTOCOL_IP6; } as->next_hop_fib_entry_index = fib_table_entry_special_add(0, &nh, FIB_SOURCE_RR, FIB_ENTRY_FLAG_NONE); as->next_hop_child_index = fib_entry_child_add(as->next_hop_fib_entry_index, lbm->fib_node_type, as - lbm->ass); lb_as_stack(as); if ( lb_vip_is_nat4_port(vip) || lb_vip_is_nat6_port(vip) ) { /* Add SNAT static mapping */ pool_get (lbm->snat_mappings, m); clib_memset (m, 0, sizeof (*m)); if (lb_vip_is_nat4_port(vip)) { lb_snat4_key_t m_key4; clib_bihash_kv_8_8_t kv4; m_key4.addr = as->address.ip4; m_key4.port = vip->encap_args.target_port; m_key4.protocol = 0; m_key4.fib_index = 0; if (vip->encap_args.srv_type == LB_SRV_TYPE_CLUSTERIP) { m->src_ip.ip4 = vip->prefix.ip4; } else if (vip->encap_args.srv_type == LB_SRV_TYPE_NODEPORT) { m->src_ip.ip4 = lbm->ip4_src_address; } m->src_ip_is_ipv6 = 0; m->as_ip.ip4 = as->address.ip4; m->as_ip_is_ipv6 = 0; m->src_port = vip->port; m->target_port = vip->encap_args.target_port; m->vrf_id = 0; m->fib_index = 0; kv4.key = m_key4.as_u64; kv4.value = m - lbm->snat_mappings; clib_bihash_add_del_8_8(&lbm->mapping_by_as4, &kv4, 1); } else { lb_snat6_key_t m_key6; clib_bihash_kv_24_8_t kv6; m_key6.addr.as_u64[0] = as->address.ip6.as_u64[0]; m_key6.addr.as_u64[1] = as->address.ip6.as_u64[1]; m_key6.port = vip->encap_args.target_port; m_key6.protocol = 0; m_key6.fib_index = 0; if (vip->encap_args.srv_type == LB_SRV_TYPE_CLUSTERIP) { m->src_ip.ip6.as_u64[0] = vip->prefix.ip6.as_u64[0]; m->src_ip.ip6.as_u64[1] = vip->prefix.ip6.as_u64[1]; } else if (vip->encap_args.srv_type == LB_SRV_TYPE_NODEPORT) { m->src_ip.ip6.as_u64[0] = lbm->ip6_src_address.as_u64[0]; m->src_ip.ip6.as_u64[1] = lbm->ip6_src_address.as_u64[1]; } m->src_ip_is_ipv6 = 1; m->as_ip.ip6.as_u64[0] = as->address.ip6.as_u64[0]; m->as_ip.ip6.as_u64[1] = as->address.ip6.as_u64[1]; m->as_ip_is_ipv6 = 1; m->src_port = vip->port; m->target_port = vip->encap_args.target_port; m->vrf_id = 0; m->fib_index = 0; kv6.key[0] = m_key6.as_u64[0]; kv6.key[1] = m_key6.as_u64[1]; kv6.key[2] = m_key6.as_u64[2]; kv6.value = m - lbm->snat_mappings; clib_bihash_add_del_24_8(&lbm->mapping_by_as6, &kv6, 1); } } } vec_free(to_be_added); //Recompute flows lb_vip_update_new_flow_table(vip); //Garbage collection maybe lb_vip_garbage_collection(vip); lb_put_writer_lock(); return 0; } int lb_flush_vip_as (u32 vip_index, u32 as_index) { u32 thread_index; vlib_thread_main_t *tm = vlib_get_thread_main(); lb_main_t *lbm = &lb_main; for(thread_index = 0; thread_index < tm->n_vlib_mains; thread_index++ ) { lb_hash_t *h = lbm->per_cpu[thread_index].sticky_ht; if (h != NULL) { u32 i; lb_hash_bucket_t *b; lb_hash_foreach_entry(h, b, i) { if ((vip_index == ~0) || ((b->vip[i] == vip_index) && (as_index == ~0)) || ((b->vip[i] == vip_index) && (b->value[i] == as_index))) { vlib_refcount_add(&lbm->as_refcount, thread_index, b->value[i], -1); vlib_refcount_add(&lbm->as_refcount, thread_index, 0, 1); b->vip[i] = ~0; b->value[i] = 0; } } if (vip_index == ~0) { lb_hash_free(h); lbm->per_cpu[thread_index].sticky_ht = 0; } } } return 0; } int lb_vip_del_ass_withlock(u32 vip_index, ip46_address_t *addresses, u32 n, u8 flush) { lb_main_t *lbm = &lb_main; u32 now = (u32) vlib_time_now(vlib_get_main()); u32 *ip = 0; u32 as_index = 0; lb_vip_t *vip; if (!(vip = lb_vip_get_by_index(vip_index))) { return VNET_API_ERROR_NO_SUCH_ENTRY; } u32 *indexes = NULL; while (n--) { if (lb_as_find_index_vip(vip, &addresses[n], &as_index)) { vec_free(indexes); return VNET_API_ERROR_NO_SUCH_ENTRY; } if (n) { //Check for duplicates u32 n2 = n - 1; while(n2--) { if (addresses[n2].as_u64[0] == addresses[n].as_u64[0] && addresses[n2].as_u64[1] == addresses[n].as_u64[1]) goto next; } } vec_add1(indexes, as_index); next: continue; } //Garbage collection maybe lb_vip_garbage_collection(vip); if (indexes != NULL) { vec_foreach(ip, indexes) { lbm->ass[*ip].flags &= ~LB_AS_FLAGS_USED; lbm->ass[*ip].last_used = now; if(flush) { /* flush flow table for deleted ASs*/ lb_flush_vip_as(vip_index, *ip); } } //Recompute flows lb_vip_update_new_flow_table(vip); } vec_free(indexes); return 0; } int lb_vip_del_ass(u32 vip_index, ip46_address_t *addresses, u32 n, u8 flush) { lb_get_writer_lock(); int ret = lb_vip_del_ass_withlock(vip_index, addresses, n, flush); lb_put_writer_lock(); return ret; } static int lb_vip_prefix_index_alloc (lb_main_t *lbm) { /* * Check for dynamically allocated instance number. */ u32 bit; bit = clib_bitmap_first_clear (lbm->vip_prefix_indexes); lbm->vip_prefix_indexes = clib_bitmap_set(lbm->vip_prefix_indexes, bit, 1); return bit; } static int lb_vip_prefix_index_free (lb_main_t *lbm, u32 instance) { if (clib_bitmap_get (lbm->vip_prefix_indexes, instance) == 0) { return -1; } lbm->vip_prefix_indexes = clib_bitmap_set (lbm->vip_prefix_indexes, instance, 0); return 0; } /** * Add the VIP adjacency to the ip4 or ip6 fib */ static void lb_vip_add_adjacency(lb_main_t *lbm, lb_vip_t *vip, u32 *vip_prefix_index) { dpo_proto_t proto = 0; dpo_type_t dpo_type = 0; u32 vip_idx = 0; if (vip->port != 0) { /* for per-port vip, if VIP adjacency has been added, * no need to add adjacency. */ if (!lb_vip_port_find_diff_port(&(vip->prefix), vip->plen, vip->protocol, vip->port, &vip_idx)) { lb_vip_t *exists_vip = lb_vip_get_by_index(vip_idx); *vip_prefix_index = exists_vip ? exists_vip->vip_prefix_index : ~0; return; } /* Allocate an index for per-port vip */ *vip_prefix_index = lb_vip_prefix_index_alloc(lbm); } else { *vip_prefix_index = vip - lbm->vips; } dpo_id_t dpo = DPO_INVALID; fib_prefix_t pfx = {}; if (lb_vip_is_ip4(vip->type)) { pfx.fp_addr.ip4 = vip->prefix.ip4; pfx.fp_len = vip->plen - 96; pfx.fp_proto = FIB_PROTOCOL_IP4; proto = DPO_PROTO_IP4; } else { pfx.fp_addr.ip6 = vip->prefix.ip6; pfx.fp_len = vip->plen; pfx.fp_proto = FIB_PROTOCOL_IP6; proto = DPO_PROTO_IP6; } if (lb_vip_is_gre4(vip)) dpo_type = lbm->dpo_gre4_type; else if (lb_vip_is_gre6(vip)) dpo_type = lbm->dpo_gre6_type; else if (lb_vip_is_gre4_port(vip)) dpo_type = lbm->dpo_gre4_port_type; else if (lb_vip_is_gre6_port(vip)) dpo_type = lbm->dpo_gre6_port_type; else if (lb_vip_is_l3dsr(vip)) dpo_type = lbm->dpo_l3dsr_type; else if (lb_vip_is_l3dsr_port(vip)) dpo_type = lbm->dpo_l3dsr_port_type; else if(lb_vip_is_nat4_port(vip)) dpo_type = lbm->dpo_nat4_port_type; else if (lb_vip_is_nat6_port(vip)) dpo_type = lbm->dpo_nat6_port_type; dpo_set(&dpo, dpo_type, proto, *vip_prefix_index); fib_table_entry_special_dpo_add(0, &pfx, lb_fib_src, FIB_ENTRY_FLAG_EXCLUSIVE, &dpo); dpo_reset(&dpo); } /** * Add the VIP filter entry */ static int lb_vip_add_port_filter(lb_main_t *lbm, lb_vip_t *vip, u32 vip_prefix_index, u32 vip_idx) { vip_port_key_t key; clib_bihash_kv_8_8_t kv; key.vip_prefix_index = vip_prefix_index; key.protocol = vip->protocol; key.port = clib_host_to_net_u16(vip->port); key.rsv = 0; kv.key = key.as_u64; kv.value = vip_idx; clib_bihash_add_del_8_8(&lbm->vip_index_per_port, &kv, 1); return 0; } /** * Del the VIP filter entry */ static int lb_vip_del_port_filter(lb_main_t *lbm, lb_vip_t *vip) { vip_port_key_t key; clib_bihash_kv_8_8_t kv, value; lb_vip_t *m = 0; key.vip_prefix_index = vip->vip_prefix_index; key.protocol = vip->protocol; key.port = clib_host_to_net_u16(vip->port); key.rsv = 0; kv.key = key.as_u64; if(clib_bihash_search_8_8(&lbm->vip_index_per_port, &kv, &value) != 0) { clib_warning("looking up vip_index_per_port failed."); return VNET_API_ERROR_NO_SUCH_ENTRY; } m = pool_elt_at_index (lbm->vips, value.value); ASSERT (m); kv.value = m - lbm->vips; clib_bihash_add_del_8_8(&lbm->vip_index_per_port, &kv, 0); return 0; } /** * Deletes the adjacency associated with the VIP */ static void lb_vip_del_adjacency(lb_main_t *lbm, lb_vip_t *vip) { fib_prefix_t pfx = {}; u32 vip_idx = 0; if (vip->port != 0) { /* If this vip adjacency is used by other per-port vip, * no need to del this adjacency. */ if (!lb_vip_port_find_diff_port(&(vip->prefix), vip->plen, vip->protocol, vip->port, &vip_idx)) { lb_put_writer_lock(); return; } /* Return vip_prefix_index for per-port vip */ lb_vip_prefix_index_free(lbm, vip->vip_prefix_index); } if (lb_vip_is_ip4(vip->type)) { pfx.fp_addr.ip4 = vip->prefix.ip4; pfx.fp_len = vip->plen - 96; pfx.fp_proto = FIB_PROTOCOL_IP4; } else { pfx.fp_addr.ip6 = vip->prefix.ip6; pfx.fp_len = vip->plen; pfx.fp_proto = FIB_PROTOCOL_IP6; } fib_table_entry_special_remove(0, &pfx, lb_fib_src); } int lb_vip_add(lb_vip_add_args_t args, u32 *vip_index) { lb_main_t *lbm = &lb_main; vlib_main_t *vm = vlib_get_main(); lb_vip_t *vip; lb_vip_type_t type = args.type; u32 vip_prefix_index = 0; lb_get_writer_lock(); ip46_prefix_normalize(&(args.prefix), args.plen); if (!lb_vip_port_find_index_with_lock(&(args.prefix), args.plen, args.protocol, args.port, vip_index)) { lb_put_writer_lock(); return VNET_API_ERROR_VALUE_EXIST; } /* Make sure we can't add a per-port VIP entry * when there already is an all-port VIP for the same prefix. */ if ((args.port != 0) && !lb_vip_port_find_all_port_vip(&(args.prefix), args.plen, vip_index)) { lb_put_writer_lock(); return VNET_API_ERROR_VALUE_EXIST; } /* Make sure we can't add a all-port VIP entry * when there already is an per-port VIP for the same prefix. */ if ((args.port == 0) && !lb_vip_port_find_diff_port(&(args.prefix), args.plen, args.protocol, args.port, vip_index)) { lb_put_writer_lock(); return VNET_API_ERROR_VALUE_EXIST; } /* Make sure all VIP for a given prefix (using different ports) have the same type. */ if ((args.port != 0) && !lb_vip_port_find_diff_port(&(args.prefix), args.plen, args.protocol, args.port, vip_index) && (args.type != lbm->vips[*vip_index].type)) { lb_put_writer_lock(); return VNET_API_ERROR_INVALID_ARGUMENT; } if (!is_pow2(args.new_length)) { lb_put_writer_lock(); return VNET_API_ERROR_INVALID_MEMORY_SIZE; } if (ip46_prefix_is_ip4(&(args.prefix), args.plen) && !lb_vip_is_ip4(type)) { lb_put_writer_lock(); return VNET_API_ERROR_INVALID_ADDRESS_FAMILY; } if ((!ip46_prefix_is_ip4(&(args.prefix), args.plen)) && !lb_vip_is_ip6(type)) { lb_put_writer_lock(); return VNET_API_ERROR_INVALID_ADDRESS_FAMILY; } if ((type == LB_VIP_TYPE_IP4_L3DSR) && (args.encap_args.dscp >= 64) ) { lb_put_writer_lock(); return VNET_API_ERROR_VALUE_EXIST; } //Allocate pool_get(lbm->vips, vip); //Init memcpy (&(vip->prefix), &(args.prefix), sizeof(args.prefix)); vip->plen = args.plen; if (args.port != 0) { vip->protocol = args.protocol; vip->port = args.port; } else { vip->protocol = (u8)~0; vip->port = 0; } vip->last_garbage_collection = (u32) vlib_time_now(vlib_get_main()); vip->type = args.type; if (args.type == LB_VIP_TYPE_IP4_L3DSR) { vip->encap_args.dscp = args.encap_args.dscp; } else if ((args.type == LB_VIP_TYPE_IP4_NAT4) ||(args.type == LB_VIP_TYPE_IP6_NAT6)) { vip->encap_args.srv_type = args.encap_args.srv_type; vip->encap_args.target_port = clib_host_to_net_u16(args.encap_args.target_port); } vip->flags = LB_VIP_FLAGS_USED; if (args.src_ip_sticky) { vip->flags |= LB_VIP_FLAGS_SRC_IP_STICKY; } vip->as_indexes = 0; //Validate counters u32 i; for (i = 0; i < LB_N_VIP_COUNTERS; i++) { vlib_validate_simple_counter(&lbm->vip_counters[i], vip - lbm->vips); vlib_zero_simple_counter(&lbm->vip_counters[i], vip - lbm->vips); } //Configure new flow table vip->new_flow_table_mask = args.new_length - 1; vip->new_flow_table = 0; //Update flow hash table lb_vip_update_new_flow_table(vip); //Create adjacency to direct traffic lb_vip_add_adjacency(lbm, vip, &vip_prefix_index); if ( (lb_vip_is_nat4_port(vip) || lb_vip_is_nat6_port(vip)) && (args.encap_args.srv_type == LB_SRV_TYPE_NODEPORT) ) { u32 key; uword * entry; //Create maping from nodeport to vip_index key = clib_host_to_net_u16(args.port); entry = hash_get_mem (lbm->vip_index_by_nodeport, &key); if (entry) { lb_put_writer_lock(); return VNET_API_ERROR_VALUE_EXIST; } hash_set_mem (lbm->vip_index_by_nodeport, &key, vip - lbm->vips); /* receive packets destined to NodeIP:NodePort */ udp_register_dst_port (vm, args.port, lb4_nodeport_node.index, 1); udp_register_dst_port (vm, args.port, lb6_nodeport_node.index, 0); } *vip_index = vip - lbm->vips; //Create per-port vip filtering table if (args.port != 0) { lb_vip_add_port_filter(lbm, vip, vip_prefix_index, *vip_index); vip->vip_prefix_index = vip_prefix_index; } lb_put_writer_lock(); return 0; } int lb_vip_del(u32 vip_index) { lb_main_t *lbm = &lb_main; lb_vip_t *vip; int rv = 0; /* Does not remove default vip, i.e. vip_index = 0 */ if (vip_index == 0) return VNET_API_ERROR_INVALID_VALUE; lb_get_writer_lock(); if (!(vip = lb_vip_get_by_index(vip_index))) { lb_put_writer_lock(); return VNET_API_ERROR_NO_SUCH_ENTRY; } //FIXME: This operation is actually not working //We will need to remove state before performing this. { //Remove all ASs ip46_address_t *ass = 0; lb_as_t *as; u32 *as_index; pool_foreach (as_index, vip->as_indexes) { as = &lbm->ass[*as_index]; vec_add1(ass, as->address); } if (vec_len(ass)) lb_vip_del_ass_withlock(vip_index, ass, vec_len(ass), 0); vec_free(ass); } //Delete adjacency lb_vip_del_adjacency(lbm, vip); //Delete per-port vip filtering entry if (vip->port != 0) { rv = lb_vip_del_port_filter(lbm, vip); } //Set the VIP as unused vip->flags &= ~LB_VIP_FLAGS_USED; lb_put_writer_lock(); return rv; } VLIB_PLUGIN_REGISTER () = { .version = VPP_BUILD_VER, .description = "Load Balancer (LB)", }; u8 *format_lb_dpo (u8 * s, va_list * va) { index_t index = va_arg (*va, index_t); CLIB_UNUSED(u32 indent) = va_arg (*va, u32); lb_main_t *lbm = &lb_main; lb_vip_t *vip = pool_elt_at_index (lbm->vips, index); return format (s, "%U", format_lb_vip, vip); } static void lb_dpo_lock (dpo_id_t *dpo) {} static void lb_dpo_unlock (dpo_id_t *dpo) {} static fib_node_t * lb_fib_node_get_node (fib_node_index_t index) { lb_main_t *lbm = &lb_main; lb_as_t *as = pool_elt_at_index (lbm->ass, index); return (&as->fib_node); } static void lb_fib_node_last_lock_gone (fib_node_t *node) { } static lb_as_t * lb_as_from_fib_node (fib_node_t *node) { return ((lb_as_t*)(((char*)node) - STRUCT_OFFSET_OF(lb_as_t, fib_node))); } static void lb_as_stack (lb_as_t *as) { lb_main_t *lbm = &lb_main; lb_vip_t *vip = &lbm->vips[as->vip_index]; dpo_type_t dpo_type = 0; if (lb_vip_is_gre4(vip)) dpo_type = lbm->dpo_gre4_type; else if (lb_vip_is_gre6(vip)) dpo_type = lbm->dpo_gre6_type; else if (lb_vip_is_gre4_port(vip)) dpo_type = lbm->dpo_gre4_port_type; else if (lb_vip_is_gre6_port(vip)) dpo_type = lbm->dpo_gre6_port_type; else if (lb_vip_is_l3dsr(vip)) dpo_type = lbm->dpo_l3dsr_type; else if (lb_vip_is_l3dsr_port(vip)) dpo_type = lbm->dpo_l3dsr_port_type; else if(lb_vip_is_nat4_port(vip)) dpo_type = lbm->dpo_nat4_port_type; else if (lb_vip_is_nat6_port(vip)) dpo_type = lbm->dpo_nat6_port_type; dpo_stack(dpo_type, lb_vip_is_ip4(vip->type)?DPO_PROTO_IP4:DPO_PROTO_IP6, &as->dpo, fib_entry_contribute_ip_forwarding( as->next_hop_fib_entry_index)); } static fib_node_back_walk_rc_t lb_fib_node_back_walk_notify (fib_node_t *node, fib_node_back_walk_ctx_t *ctx) { lb_as_stack(lb_as_from_fib_node(node)); return (FIB_NODE_BACK_WALK_CONTINUE); } int lb_nat4_interface_add_del (u32 sw_if_index, int is_del) { if (is_del) { vnet_feature_enable_disable ("ip4-unicast", "lb-nat4-in2out", sw_if_index, 0, 0, 0); } else { vnet_feature_enable_disable ("ip4-unicast", "lb-nat4-in2out", sw_if_index, 1, 0, 0); } return 0; } int lb_nat6_interface_add_del (u32 sw_if_index, int is_del) { if (is_del) { vnet_feature_enable_disable ("ip6-unicast", "lb-nat6-in2out", sw_if_index, 0, 0, 0); } else { vnet_feature_enable_disable ("ip6-unicast", "lb-nat6-in2out", sw_if_index, 1, 0, 0); } return 0; } clib_error_t * lb_init (vlib_main_t * vm) { vlib_thread_main_t *tm = vlib_get_thread_main (); lb_main_t *lbm = &lb_main; lbm->vnet_main = vnet_get_main (); lbm->vlib_main = vm; lb_vip_t *default_vip; lb_as_t *default_as; fib_node_vft_t lb_fib_node_vft = { .fnv_get = lb_fib_node_get_node, .fnv_last_lock = lb_fib_node_last_lock_gone, .fnv_back_walk = lb_fib_node_back_walk_notify, }; dpo_vft_t lb_vft = { .dv_lock = lb_dpo_lock, .dv_unlock = lb_dpo_unlock, .dv_format = format_lb_dpo, }; //Allocate and init default VIP. lbm->vips = 0; pool_get(lbm->vips, default_vip); default_vip->new_flow_table_mask = 0; default_vip->prefix.ip6.as_u64[0] = 0xffffffffffffffffL; default_vip->prefix.ip6.as_u64[1] = 0xffffffffffffffffL; default_vip->protocol = ~0; default_vip->port = 0; default_vip->flags = LB_VIP_FLAGS_USED; lbm->per_cpu = 0; vec_validate(lbm->per_cpu, tm->n_vlib_mains - 1); clib_spinlock_init (&lbm->writer_lock); lbm->per_cpu_sticky_buckets = LB_DEFAULT_PER_CPU_STICKY_BUCKETS; lbm->flow_timeout = LB_DEFAULT_FLOW_TIMEOUT; lbm->ip4_src_address.as_u32 = 0xffffffff; lbm->ip6_src_address.as_u64[0] = 0xffffffffffffffffL; lbm->ip6_src_address.as_u64[1] = 0xffffffffffffffffL; lbm->dpo_gre4_type = dpo_register_new_type(&lb_vft, lb_dpo_gre4_nodes); lbm->dpo_gre6_type = dpo_register_new_type(&lb_vft, lb_dpo_gre6_nodes); lbm->dpo_gre4_port_type = dpo_register_new_type(&lb_vft, lb_dpo_gre4_port_nodes); lbm->dpo_gre6_port_type = dpo_register_new_type(&lb_vft, lb_dpo_gre6_port_nodes); lbm->dpo_l3dsr_type = dpo_register_new_type(&lb_vft, lb_dpo_l3dsr_nodes); lbm->dpo_l3dsr_port_type = dpo_register_new_type(&lb_vft, lb_dpo_l3dsr_port_nodes); lbm->dpo_nat4_port_type = dpo_register_new_type(&lb_vft, lb_dpo_nat4_port_nodes); lbm->dpo_nat6_port_type = dpo_register_new_type(&lb_vft, lb_dpo_nat6_port_nodes); lbm->fib_node_type = fib_node_register_new_type ("lb", &lb_fib_node_vft); //Init AS reference counters vlib_refcount_init(&lbm->as_refcount); //Allocate and init default AS. lbm->ass = 0; pool_get(lbm->ass, default_as); default_as->flags = 0; default_as->dpo.dpoi_next_node = LB_NEXT_DROP; default_as->vip_index = ~0; default_as->address.ip6.as_u64[0] = 0xffffffffffffffffL; default_as->address.ip6.as_u64[1] = 0xffffffffffffffffL; /* Generate a valid flow table for default VIP */ default_vip->as_indexes = NULL; lb_get_writer_lock(); lb_vip_update_new_flow_table(default_vip); lb_put_writer_lock(); lbm->vip_index_by_nodeport = hash_create_mem (0, sizeof(u16), sizeof (uword)); clib_bihash_init_8_8 (&lbm->vip_index_per_port, "vip_index_per_port", LB_VIP_PER_PORT_BUCKETS, LB_VIP_PER_PORT_MEMORY_SIZE); clib_bihash_init_8_8 (&lbm->mapping_by_as4, "mapping_by_as4", LB_MAPPING_BUCKETS, LB_MAPPING_MEMORY_SIZE); clib_bihash_init_24_8 (&lbm->mapping_by_as6, "mapping_by_as6", LB_MAPPING_BUCKETS, LB_MAPPING_MEMORY_SIZE); #define _(a,b,c) lbm->vip_counters[c].name = b; lb_foreach_vip_counter #undef _ lb_fib_src = fib_source_allocate("lb", FIB_SOURCE_PRIORITY_HI, FIB_SOURCE_BH_SIMPLE); return NULL; } VLIB_INIT_FUNCTION (lb_init);