/* *--------------------------------------------------------------------------- * cnat_ipv4_icmp_query_outside_input.c - cnat_ipv4_icmp_query_outside_input node pipeline stage functions * * * Copyright (c) 2008-2014 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 "cnat_ipv4_icmp.h" #define foreach_cnat_ipv4_icmp_q_outside_input_error \ _(CNAT_V4_ICMP_Q_O2I_T_PKT, "cnat v4 icmp_q o2i packet transmit") \ _(CNAT_V4_ICMP_Q_O2I_MISS_PKT, "cnat v4 icmp_q o2i drop") \ _(CNAT_V4_ICMP_Q_O2I_TTL_GEN, "cnat v4 icmp_q o2i ttl generate") \ _(CNAT_V4_ICMP_Q_O2I_TTL_DROP, "cnat v4 icmp_q o2i ttl drop") \ _(CNAT_V4_ICMP_Q_O2I_NO_SESSION_DROP, "cnat v4 icmp_q o2i no session drop") typedef enum { #define _(sym,str) sym, foreach_cnat_ipv4_icmp_q_outside_input_error #undef _ CNAT_IPV4_ICMP_Q_OUTSIDE_INPUT_N_ERROR, } cnat_ipv4_icmp_q_outside_input_t; static char * cnat_ipv4_icmp_q_outside_input_error_strings[] = { #define _(sym,string) string, foreach_cnat_ipv4_icmp_q_outside_input_error #undef _ }; typedef struct { u32 cached_next_index; /* $$$$ add data here */ /* convenience variables */ vlib_main_t * vlib_main; vnet_main_t * vnet_main; } cnat_ipv4_icmp_q_outside_input_main_t; typedef enum { CNAT_V4_ICMP_Q_O2I_T, CNAT_V4_ICMP_Q_O2I_D, CNAT_V4_ICMP_Q_O2I_NEXT, } cnat_ipv4_icmp_q_outside_input_next_t; cnat_ipv4_icmp_q_outside_input_main_t cnat_ipv4_icmp_q_outside_input_main; vlib_node_registration_t cnat_ipv4_icmp_q_outside_input_node; #define NSTAGES 5 inline void swap_ip_dst_icmp_id(ipv4_header *ip, icmp_v4_t *icmp, cnat_main_db_entry_t *db, u16 vrf) { #if 0 u32 postmap_ip; u8 direction; u32 old_ip; u32 old_postmap_ip; if(is_static_dest_nat_enabled(vrf) == CNAT_SUCCESS) { direction = 1; if(cnat_static_dest_db_get_translation(ip->src_addr, &postmap_ip, vrf, direction) == CNAT_SUCCESS) { CNAT_UPDATE_L3_CHECKSUM_DECLARE old_ip = spp_net_to_host_byte_order_32(&(ip->src_addr)); old_postmap_ip = spp_net_to_host_byte_order_32(&postmap_ip); CNAT_UPDATE_L3_CHECKSUM(((u16)(old_ip & 0xFFFF)), ((u16)(old_ip >> 16)), (spp_net_to_host_byte_order_16(&(ip->checksum))), ((u16)(old_postmap_ip & 0xFFFF)), ((u16)(old_postmap_ip >> 16))) ip->checksum = spp_host_to_net_byte_order_16(new_l3_c); ip->src_addr = postmap_ip; } } #endif /* if 0 */ /* * declare variable */ CNAT_UPDATE_L3_L4_CHECKSUM_DECLARE /* * calculate checksum */ CNAT_UPDATE_L3_ICMP_CHECKSUM(((u16)(db->out2in_key.k.ipv4)), ((u16)(db->out2in_key.k.ipv4 >> 16)), (db->out2in_key.k.port), (clib_net_to_host_u16(ip->checksum)), (clib_net_to_host_u16(icmp->checksum)), ((u16)(db->in2out_key.k.ipv4)), ((u16)(db->in2out_key.k.ipv4 >> 16)), (db->in2out_key.k.port)) //set ip header ip->dest_addr = clib_host_to_net_u32(db->in2out_key.k.ipv4); ip->checksum = clib_host_to_net_u16(new_l3_c); //set icmp header icmp->identifier = clib_host_to_net_u16(db->in2out_key.k.port); icmp->checksum = clib_host_to_net_u16(new_l4_c); } /* * Use the generic buffer metadata + first line of packet data prefetch * stage function from . This is usually a Good Idea. */ #define stage0 generic_stage0 static inline void stage1(vlib_main_t * vm, vlib_node_runtime_t * node, u32 buffer_index) { u64 a, b, c; u32 bucket; u8 *prefetch_target; vlib_buffer_t * b0 = vlib_get_buffer (vm, buffer_index); ipv4_header *ip = vlib_buffer_get_current (b0); u8 ipv4_hdr_len = (ip->version_hdr_len_words & 0xf) << 2; icmp_v4_t *icmp = (icmp_v4_t *)((u8*)ip + ipv4_hdr_len); u64 tmp = 0; tmp = vnet_buffer(b0)->vcgn_uii.key.k.ipv4 = clib_net_to_host_u32(ip->dest_addr); vnet_buffer(b0)->vcgn_uii.key.k.port = clib_net_to_host_u16 (icmp->identifier); tmp |= ((u64)vnet_buffer(b0)->vcgn_uii.key.k.port) << 32; PLATFORM_CNAT_SET_RX_VRF(vnet_buffer(b0)->sw_if_index[VLIB_RX], vnet_buffer(b0)->vcgn_uii.key.k.vrf, CNAT_ICMP) tmp |= ((u64)vnet_buffer(b0)->vcgn_uii.key.k.vrf) << 48; CNAT_V4_GET_HASH(tmp, bucket, CNAT_MAIN_HASH_MASK) prefetch_target = (u8 *)(&cnat_out2in_hash[bucket]); vnet_buffer(b0)->vcgn_uii.bucket = bucket; /* Prefetch the hash bucket */ CLIB_PREFETCH(prefetch_target, CLIB_CACHE_LINE_BYTES, LOAD); } #define SPP_LOG2_CACHE_LINE_BYTES 6 #define SPP_CACHE_LINE_BYTES (1 << SPP_LOG2_CACHE_LINE_BYTES) static inline void stage2(vlib_main_t * vm, vlib_node_runtime_t * node, u32 buffer_index) { vlib_buffer_t * b0 = vlib_get_buffer(vm, buffer_index); uword prefetch_target0, prefetch_target1; u32 bucket = vnet_buffer(b0)->vcgn_uii.bucket; /* read the hash bucket */ u32 db_index = vnet_buffer(b0)->vcgn_uii.bucket = cnat_out2in_hash[bucket].next; if (PREDICT_TRUE(db_index != EMPTY)) { /* * Prefetch database keys. We save space by not cache-line * aligning the DB entries. We don't want to waste LSU * bandwidth prefetching stuff we won't need. */ prefetch_target0 = (uword)(cnat_main_db + db_index); CLIB_PREFETCH((void*)prefetch_target0, CLIB_CACHE_LINE_BYTES, LOAD); /* Just beyond DB key #2 */ prefetch_target1 = prefetch_target0 + STRUCT_OFFSET_OF(cnat_main_db_entry_t, user_ports); /* If the targets are in different lines, do the second prefetch */ if (PREDICT_FALSE((prefetch_target0 & ~(SPP_CACHE_LINE_BYTES-1)) != (prefetch_target1 & ~(SPP_CACHE_LINE_BYTES-1)))) { CLIB_PREFETCH((void *)prefetch_target1, CLIB_CACHE_LINE_BYTES, LOAD); } } } static inline void stage3(vlib_main_t * vm, vlib_node_runtime_t * node, u32 buffer_index) { cnat_main_db_entry_t *db; vlib_buffer_t * b0 = vlib_get_buffer(vm, buffer_index); u32 db_index = vnet_buffer(b0)->vcgn_uii.bucket; /* * Note: if the search already failed (empty bucket), * the answer is already in the pipeline context structure */ if (PREDICT_TRUE(db_index != EMPTY)) { /* * Note: hash collisions suck. We can't easily prefetch around them. * The first trip around the track will be fast. After that, maybe * not so much... */ do { db = cnat_main_db + db_index; if (PREDICT_TRUE(db->out2in_key.key64 == vnet_buffer(b0)->vcgn_uii.key.key64)) { break; } db_index = db->out2in_hash.next; } while (db_index != EMPTY); /* Stick the answer back into the pipeline context structure */ vnet_buffer(b0)->vcgn_uii.bucket = db_index; } } static inline u32 last_stage (vlib_main_t *vm, vlib_node_runtime_t *node, u32 bi) { vlib_buffer_t *b0 = vlib_get_buffer (vm, bi); u32 db_index = vnet_buffer(b0)->vcgn_uii.bucket; int disposition = CNAT_V4_ICMP_Q_O2I_T; int counter = CNAT_V4_ICMP_Q_O2I_T_PKT; ipv4_header *ip = (ipv4_header *)vlib_buffer_get_current(b0); u8 ipv4_hdr_len = (ip->version_hdr_len_words & 0xf) << 2; icmp_v4_t *icmp = (icmp_v4_t *)((u8*)ip + ipv4_hdr_len); vlib_node_t *n = vlib_get_node (vm, cnat_ipv4_icmp_q_outside_input_node.index); u32 node_counter_base_index = n->error_heap_index; vlib_error_main_t * em = &vm->error_main; cnat_session_entry_t *session_db = NULL; cnat_main_db_entry_t *db = NULL; cnat_key_t dest_info; cnat_vrfmap_t * vrf_map_p __attribute__((unused)) = NULL; u32 vrf_index __attribute__((unused)) = 0; if (PREDICT_TRUE(db_index != EMPTY)) { db = cnat_main_db + db_index; dest_info.k.port = 0; dest_info.k.ipv4 = clib_net_to_host_u32(ip->src_addr); if (PREDICT_FALSE(icmp_debug_flag)) { printf("\nDUMPING ICMP PKT BEFORE\n"); print_icmp_pkt(ip); } vrf_map_p = cnat_map_by_vrf + db->vrfmap_index; vrf_index = (db->in2out_key.k.vrf & CNAT_VRF_MASK); if(PREDICT_TRUE(!PLATFORM_DBL_SUPPORT)) { /* No DBL support, so just update the destn and proceed */ db->dst_ipv4 = dest_info.k.ipv4; db->dst_port = dest_info.k.port; goto update_pkt; } if(PREDICT_FALSE(db->dst_ipv4 != dest_info.k.ipv4)) { if(PREDICT_TRUE(db->nsessions == 1)) { /* Handle one to 2 dest scenarion */ dest_info.k.vrf = db->in2out_key.k.vrf; session_db = cnat_handle_1to2_session(db, &dest_info); if(PREDICT_FALSE(session_db == NULL)) { disposition = CNAT_V4_ICMP_Q_O2I_D; counter = CNAT_V4_ICMP_Q_O2I_NO_SESSION_DROP; goto drop_pkt; } } else if (PREDICT_FALSE(db->nsessions == 0)) { /* Should be a static entry * Note this session as the first session and log */ cnat_add_dest_n_log(db, &dest_info); } else { /* Many translations exist already */ dest_info.k.vrf = db->in2out_key.k.vrf; /* If session already exists, * cnat_create_session_db_entry will return the existing db * else create a new db * If could not create, return NULL */ session_db = cnat_create_session_db_entry(&dest_info, db, TRUE); if(PREDICT_FALSE(session_db == NULL)) { disposition = CNAT_V4_ICMP_Q_O2I_D; counter = CNAT_V4_ICMP_Q_O2I_NO_SESSION_DROP; goto drop_pkt; } } } update_pkt: if (PLATFORM_HANDLE_TTL_DECREMENT) { /* * Decrement TTL and update IPv4 checksum */ ipv4_decr_ttl_n_calc_csum(ip); } /* * 1. update dest ipv4 addr and icmp id * 2. update ipv4 checksum and icmp checksum */ swap_ip_dst_icmp_id(ip, icmp, db, db->in2out_key.k.vrf); if (PREDICT_FALSE(icmp_debug_flag)) { printf("\nDUMPING ICMP PKT AFTER\n"); print_icmp_pkt(ip); } db->out2in_pkts++; //nat44_dslite_global_stats[dslite_flag].out2in_forwarding_count++; } else { disposition = CNAT_V4_ICMP_Q_O2I_D; counter = CNAT_V4_ICMP_Q_O2I_MISS_PKT; } drop_pkt: em->counters[node_counter_base_index + counter] += 1; return disposition; } #include static uword cnat_ipv4_icmp_q_outside_input_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return dispatch_pipeline (vm, node, frame); } VLIB_REGISTER_NODE (cnat_ipv4_icmp_q_outside_input_node) = { .function = cnat_ipv4_icmp_q_outside_input_node_fn, .name = "vcgn-v4-icmp-q-o2i", .vector_size = sizeof (u32), .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(cnat_ipv4_icmp_q_outside_input_error_strings), .error_strings = cnat_ipv4_icmp_q_outside_input_error_strings, .n_next_nodes = CNAT_V4_ICMP_Q_O2I_NEXT, /* edit / add dispositions here */ .next_nodes = { [CNAT_V4_ICMP_Q_O2I_T] = "ip4-input", [CNAT_V4_ICMP_Q_O2I_D] = "error-drop", }, }; clib_error_t *cnat_ipv4_icmp_q_outside_input_init (vlib_main_t *vm) { cnat_ipv4_icmp_q_outside_input_main_t * mp = &cnat_ipv4_icmp_q_outside_input_main; mp->vlib_main = vm; mp->vnet_main = vnet_get_main(); return 0; } VLIB_INIT_FUNCTION (cnat_ipv4_icmp_q_outside_input_init);