X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=src%2Fplugins%2Fnat%2Fin2out.c;h=786b6c6887b025d7fddbabc7e0e35b3ca8b5d5be;hb=1e5c07d;hp=24ff38602c50b221d5ecd37488925084100cb895;hpb=87da476db0cd804e11463cc453a2bb41c6808542;p=vpp.git diff --git a/src/plugins/nat/in2out.c b/src/plugins/nat/in2out.c index 24ff38602c5..786b6c6887b 100755 --- a/src/plugins/nat/in2out.c +++ b/src/plugins/nat/in2out.c @@ -24,6 +24,7 @@ #include #include #include +#include #include #include @@ -83,6 +84,25 @@ static u8 * format_snat_in2out_worker_handoff_trace (u8 * s, va_list * args) return s; } +typedef struct { + u32 sw_if_index; + u32 next_index; + u8 cached; +} nat44_in2out_reass_trace_t; + +static u8 * format_nat44_in2out_reass_trace (u8 * s, va_list * args) +{ + CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); + CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); + nat44_in2out_reass_trace_t * t = va_arg (*args, nat44_in2out_reass_trace_t *); + + s = format (s, "NAT44_IN2OUT_REASS: sw_if_index %d, next index %d, status %s", + t->sw_if_index, t->next_index, + t->cached ? "cached" : "translated"); + + return s; +} + vlib_node_registration_t snat_in2out_node; vlib_node_registration_t snat_in2out_slowpath_node; vlib_node_registration_t snat_in2out_fast_node; @@ -94,6 +114,7 @@ vlib_node_registration_t snat_in2out_output_worker_handoff_node; vlib_node_registration_t snat_hairpin_dst_node; vlib_node_registration_t snat_hairpin_src_node; vlib_node_registration_t nat44_hairpinning_node; +vlib_node_registration_t nat44_in2out_reass_node; #define foreach_snat_in2out_error \ @@ -103,7 +124,10 @@ _(OUT_OF_PORTS, "Out of ports") \ _(BAD_OUTSIDE_FIB, "Outside VRF ID not found") \ _(BAD_ICMP_TYPE, "unsupported ICMP type") \ _(NO_TRANSLATION, "No translation") \ -_(MAX_SESSIONS_EXCEEDED, "Maximum sessions exceeded") +_(MAX_SESSIONS_EXCEEDED, "Maximum sessions exceeded") \ +_(DROP_FRAGMENT, "Drop fragment") \ +_(MAX_REASS, "Maximum reassemblies exceeded") \ +_(MAX_FRAG, "Maximum fragments per reassembly exceeded") typedef enum { #define _(sym,str) SNAT_IN2OUT_ERROR_##sym, @@ -123,6 +147,7 @@ typedef enum { SNAT_IN2OUT_NEXT_DROP, SNAT_IN2OUT_NEXT_ICMP_ERROR, SNAT_IN2OUT_NEXT_SLOW_PATH, + SNAT_IN2OUT_NEXT_REASS, SNAT_IN2OUT_N_NEXT, } snat_in2out_next_t; @@ -137,7 +162,7 @@ typedef enum { /** * @brief Check if packet should be translated * - * Packets aimed at outside interface and external addresss with active session + * Packets aimed at outside interface and external address with active session * should be translated. * * @param sm NAT main @@ -154,6 +179,9 @@ snat_not_translate_fast (snat_main_t * sm, vlib_node_runtime_t *node, u32 sw_if_index0, ip4_header_t * ip0, u32 proto0, u32 rx_fib_index0) { + if (sm->out2in_dpo) + return 0; + fib_node_index_t fei = FIB_NODE_INDEX_INVALID; fib_prefix_t pfx = { .fp_proto = FIB_PROTOCOL_IP4, @@ -182,7 +210,7 @@ snat_not_translate_fast (snat_main_t * sm, vlib_node_runtime_t *node, pool_foreach (i, sm->interfaces, ({ /* NAT packet aimed at outside interface */ - if ((i->is_inside == 0) && (sw_if_index == i->sw_if_index)) + if ((nat_interface_is_outside(i)) && (sw_if_index == i->sw_if_index)) return 0; })); } @@ -211,16 +239,60 @@ snat_not_translate (snat_main_t * sm, vlib_node_runtime_t *node, &value0)) { /* or is static mappings */ - if (!snat_static_mapping_match(sm, key0, &sm0, 1, 0)) + if (!snat_static_mapping_match(sm, key0, &sm0, 1, 0, 0, 0)) return 0; } else return 0; + if (sm->forwarding_enabled) + return 1; + return snat_not_translate_fast(sm, node, sw_if_index0, ip0, proto0, rx_fib_index0); } +static inline int +nat_not_translate_output_feature (snat_main_t * sm, ip4_header_t * ip0, + u32 proto0, u16 src_port, u16 dst_port, + u32 thread_index, u32 sw_if_index) +{ + snat_session_key_t key0; + clib_bihash_kv_8_8_t kv0, value0; + snat_interface_t *i; + + /* src NAT check */ + key0.addr = ip0->src_address; + key0.port = src_port; + key0.protocol = proto0; + key0.fib_index = sm->outside_fib_index; + kv0.key = key0.as_u64; + + if (!clib_bihash_search_8_8 (&sm->per_thread_data[thread_index].out2in, &kv0, + &value0)) + return 1; + + /* dst NAT check */ + key0.addr = ip0->dst_address; + key0.port = dst_port; + key0.protocol = proto0; + key0.fib_index = sm->inside_fib_index; + kv0.key = key0.as_u64; + if (!clib_bihash_search_8_8 (&sm->per_thread_data[thread_index].in2out, &kv0, + &value0)) + { + /* hairpinning */ + pool_foreach (i, sm->output_feature_interfaces, + ({ + if ((nat_interface_is_inside(i)) && (sw_if_index == i->sw_if_index)) + return 0; + })); + return 1; + } + + return 0; +} + static u32 slow_path (snat_main_t *sm, vlib_buffer_t *b0, ip4_header_t * ip0, u32 rx_fib_index0, @@ -231,22 +303,19 @@ static u32 slow_path (snat_main_t *sm, vlib_buffer_t *b0, u32 thread_index) { snat_user_t *u; - snat_user_key_t user_key; snat_session_t *s; - clib_bihash_kv_8_8_t kv0, value0; - u32 oldest_per_user_translation_list_index; - dlist_elt_t * oldest_per_user_translation_list_elt; - dlist_elt_t * per_user_translation_list_elt; - dlist_elt_t * per_user_list_head_elt; - u32 session_index; + clib_bihash_kv_8_8_t kv0; snat_session_key_t key1; u32 address_index = ~0; u32 outside_fib_index; uword * p; + udp_header_t * udp0 = ip4_next_header (ip0); + u8 is_sm = 0; if (PREDICT_FALSE (maximum_sessions_exceeded(sm, thread_index))) { b0->error = node->errors[SNAT_IN2OUT_ERROR_MAX_SESSIONS_EXCEEDED]; + nat_ipfix_logging_max_sessions(sm->max_translations); return SNAT_IN2OUT_NEXT_DROP; } @@ -259,185 +328,49 @@ static u32 slow_path (snat_main_t *sm, vlib_buffer_t *b0, outside_fib_index = p[0]; key1.protocol = key0->protocol; - user_key.addr = ip0->src_address; - user_key.fib_index = rx_fib_index0; - kv0.key = user_key.as_u64; - - /* Ever heard of the "user" = src ip4 address before? */ - if (clib_bihash_search_8_8 (&sm->per_thread_data[thread_index].user_hash, - &kv0, &value0)) - { - /* no, make a new one */ - pool_get (sm->per_thread_data[thread_index].users, u); - memset (u, 0, sizeof (*u)); - u->addr = ip0->src_address; - u->fib_index = rx_fib_index0; - - pool_get (sm->per_thread_data[thread_index].list_pool, per_user_list_head_elt); - u->sessions_per_user_list_head_index = per_user_list_head_elt - - sm->per_thread_data[thread_index].list_pool; - - clib_dlist_init (sm->per_thread_data[thread_index].list_pool, - u->sessions_per_user_list_head_index); - - kv0.value = u - sm->per_thread_data[thread_index].users; - - /* add user */ - clib_bihash_add_del_8_8 (&sm->per_thread_data[thread_index].user_hash, - &kv0, 1 /* is_add */); - } - else + u = nat_user_get_or_create (sm, &ip0->src_address, rx_fib_index0, + thread_index); + if (!u) { - u = pool_elt_at_index (sm->per_thread_data[thread_index].users, - value0.value); + clib_warning ("create NAT user failed"); + return SNAT_IN2OUT_NEXT_DROP; } - /* Over quota? Recycle the least recently used dynamic translation */ - if (u->nsessions >= sm->max_translations_per_user) + /* First try to match static mapping by local address and port */ + if (snat_static_mapping_match (sm, *key0, &key1, 0, 0, 0, 0)) { - /* Remove the oldest dynamic translation */ - do { - oldest_per_user_translation_list_index = - clib_dlist_remove_head (sm->per_thread_data[thread_index].list_pool, - u->sessions_per_user_list_head_index); - - ASSERT (oldest_per_user_translation_list_index != ~0); - - /* add it back to the end of the LRU list */ - clib_dlist_addtail (sm->per_thread_data[thread_index].list_pool, - u->sessions_per_user_list_head_index, - oldest_per_user_translation_list_index); - /* Get the list element */ - oldest_per_user_translation_list_elt = - pool_elt_at_index (sm->per_thread_data[thread_index].list_pool, - oldest_per_user_translation_list_index); - - /* Get the session index from the list element */ - session_index = oldest_per_user_translation_list_elt->value; - - /* Get the session */ - s = pool_elt_at_index (sm->per_thread_data[thread_index].sessions, - session_index); - } while (snat_is_session_static (s)); - - if (snat_is_unk_proto_session (s)) - { - clib_bihash_kv_16_8_t up_kv; - nat_ed_ses_key_t key; - - /* Remove from lookup tables */ - key.l_addr = s->in2out.addr; - key.r_addr = s->ext_host_addr; - key.fib_index = s->in2out.fib_index; - key.proto = s->in2out.port; - key.rsvd = 0; - key.l_port = 0; - up_kv.key[0] = key.as_u64[0]; - up_kv.key[1] = key.as_u64[1]; - if (clib_bihash_add_del_16_8 (&sm->in2out_ed, &up_kv, 0)) - clib_warning ("in2out key del failed"); - - key.l_addr = s->out2in.addr; - key.fib_index = s->out2in.fib_index; - up_kv.key[0] = key.as_u64[0]; - up_kv.key[1] = key.as_u64[1]; - if (clib_bihash_add_del_16_8 (&sm->out2in_ed, &up_kv, 0)) - clib_warning ("out2in key del failed"); - } - else - { - /* Remove in2out, out2in keys */ - kv0.key = s->in2out.as_u64; - if (clib_bihash_add_del_8_8 (&sm->per_thread_data[thread_index].in2out, - &kv0, 0 /* is_add */)) - clib_warning ("in2out key delete failed"); - kv0.key = s->out2in.as_u64; - if (clib_bihash_add_del_8_8 (&sm->per_thread_data[thread_index].out2in, - &kv0, 0 /* is_add */)) - clib_warning ("out2in key delete failed"); - - /* log NAT event */ - snat_ipfix_logging_nat44_ses_delete(s->in2out.addr.as_u32, - s->out2in.addr.as_u32, - s->in2out.protocol, - s->in2out.port, - s->out2in.port, - s->in2out.fib_index); - - snat_free_outside_address_and_port - (sm, thread_index, &s->out2in, s->outside_address_index); - } - s->outside_address_index = ~0; - - if (snat_alloc_outside_address_and_port (sm, rx_fib_index0, thread_index, - &key1, &address_index)) + /* Try to create dynamic translation */ + if (snat_alloc_outside_address_and_port (sm->addresses, rx_fib_index0, + thread_index, &key1, + &address_index, + sm->port_per_thread, + sm->per_thread_data[thread_index].snat_thread_index)) { - ASSERT(0); - b0->error = node->errors[SNAT_IN2OUT_ERROR_OUT_OF_PORTS]; return SNAT_IN2OUT_NEXT_DROP; } - s->outside_address_index = address_index; } else - { - u8 static_mapping = 1; - - /* First try to match static mapping by local address and port */ - if (snat_static_mapping_match (sm, *key0, &key1, 0, 0)) - { - static_mapping = 0; - /* Try to create dynamic translation */ - if (snat_alloc_outside_address_and_port (sm, rx_fib_index0, - thread_index, &key1, - &address_index)) - { - b0->error = node->errors[SNAT_IN2OUT_ERROR_OUT_OF_PORTS]; - return SNAT_IN2OUT_NEXT_DROP; - } - } - - /* Create a new session */ - pool_get (sm->per_thread_data[thread_index].sessions, s); - memset (s, 0, sizeof (*s)); - - s->outside_address_index = address_index; - - if (static_mapping) - { - u->nstaticsessions++; - s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING; - } - else - { - u->nsessions++; - } - - /* Create list elts */ - pool_get (sm->per_thread_data[thread_index].list_pool, - per_user_translation_list_elt); - clib_dlist_init (sm->per_thread_data[thread_index].list_pool, - per_user_translation_list_elt - - sm->per_thread_data[thread_index].list_pool); + is_sm = 1; - per_user_translation_list_elt->value = - s - sm->per_thread_data[thread_index].sessions; - s->per_user_index = per_user_translation_list_elt - - sm->per_thread_data[thread_index].list_pool; - s->per_user_list_head_index = u->sessions_per_user_list_head_index; - - clib_dlist_addtail (sm->per_thread_data[thread_index].list_pool, - s->per_user_list_head_index, - per_user_translation_list_elt - - sm->per_thread_data[thread_index].list_pool); - } + s = nat_session_alloc_or_recycle (sm, u, thread_index); + if (!s) + { + clib_warning ("create NAT session failed"); + return SNAT_IN2OUT_NEXT_DROP; + } + if (is_sm) + s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING; + user_session_increment (sm, u, is_sm); + s->outside_address_index = address_index; s->in2out = *key0; s->out2in = key1; s->out2in.protocol = key0->protocol; s->out2in.fib_index = outside_fib_index; s->ext_host_addr.as_u32 = ip0->dst_address.as_u32; + s->ext_host_port = udp0->dst_port; *sessionp = s; /* Add to translation hashes */ @@ -509,6 +442,109 @@ snat_in2out_error_t icmp_get_key(ip4_header_t *ip0, return -1; /* success */ } +static_always_inline int +icmp_get_ed_key(ip4_header_t *ip0, nat_ed_ses_key_t *p_key0) +{ + icmp46_header_t *icmp0; + nat_ed_ses_key_t key0; + icmp_echo_header_t *echo0, *inner_echo0 = 0; + ip4_header_t *inner_ip0 = 0; + void *l4_header = 0; + icmp46_header_t *inner_icmp0; + + icmp0 = (icmp46_header_t *) ip4_next_header (ip0); + echo0 = (icmp_echo_header_t *)(icmp0+1); + + if (!icmp_is_error_message (icmp0)) + { + key0.proto = IP_PROTOCOL_ICMP; + key0.l_addr = ip0->src_address; + key0.r_addr = ip0->dst_address; + key0.l_port = key0.r_port = echo0->identifier; + } + else + { + inner_ip0 = (ip4_header_t *)(echo0+1); + l4_header = ip4_next_header (inner_ip0); + key0.proto = inner_ip0->protocol; + key0.r_addr = inner_ip0->src_address; + key0.l_addr = inner_ip0->dst_address; + switch (ip_proto_to_snat_proto (inner_ip0->protocol)) + { + case SNAT_PROTOCOL_ICMP: + inner_icmp0 = (icmp46_header_t*)l4_header; + inner_echo0 = (icmp_echo_header_t *)(inner_icmp0+1); + key0.r_port = key0.l_port = inner_echo0->identifier; + break; + case SNAT_PROTOCOL_UDP: + case SNAT_PROTOCOL_TCP: + key0.l_port = ((tcp_udp_header_t*)l4_header)->dst_port; + key0.r_port = ((tcp_udp_header_t*)l4_header)->src_port; + break; + default: + return SNAT_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL; + } + } + *p_key0 = key0; + return 0; +} + +static inline int +nat_not_translate_output_feature_fwd (snat_main_t * sm, ip4_header_t * ip, + u32 thread_index) +{ + nat_ed_ses_key_t key; + clib_bihash_kv_16_8_t kv, value; + udp_header_t *udp; + snat_session_t *s = 0; + snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index]; + + if (!sm->forwarding_enabled) + return 0; + + if (ip->protocol == IP_PROTOCOL_ICMP) + { + if (icmp_get_ed_key (ip, &key)) + return 0; + } + else if (ip->protocol == IP_PROTOCOL_UDP || ip->protocol == IP_PROTOCOL_TCP) + { + udp = ip4_next_header(ip); + key.l_addr = ip->src_address; + key.r_addr = ip->dst_address; + key.proto = ip->protocol; + key.r_port = udp->dst_port; + key.l_port = udp->src_port; + } + else + { + key.l_addr = ip->src_address; + key.r_addr = ip->dst_address; + key.proto = ip->protocol; + key.l_port = key.r_port = 0; + } + key.fib_index = 0; + kv.key[0] = key.as_u64[0]; + kv.key[1] = key.as_u64[1]; + + if (!clib_bihash_search_16_8 (&sm->in2out_ed, &kv, &value)) + { + s = pool_elt_at_index (sm->per_thread_data[thread_index].sessions, value.value); + if (is_fwd_bypass_session (s)) + { + /* Per-user LRU list maintenance */ + clib_dlist_remove (tsm->list_pool, s->per_user_index); + clib_dlist_addtail (tsm->list_pool, s->per_user_list_head_index, + s->per_user_index); + return 1; + } + else + return 0; + } + + return 0; +} + /** * Get address and port values to be used for ICMP packet translation * and create session if needed @@ -557,12 +593,23 @@ u32 icmp_match_in2out_slow(snat_main_t *sm, vlib_node_runtime_t *node, if (clib_bihash_search_8_8 (&sm->per_thread_data[thread_index].in2out, &kv0, &value0)) { - if (PREDICT_FALSE(snat_not_translate(sm, node, sw_if_index0, ip0, - IP_PROTOCOL_ICMP, rx_fib_index0, thread_index) && - vnet_buffer(b0)->sw_if_index[VLIB_TX] == ~0)) + if (vnet_buffer(b0)->sw_if_index[VLIB_TX] != ~0) { - dont_translate = 1; - goto out; + if (PREDICT_FALSE(nat_not_translate_output_feature(sm, + ip0, SNAT_PROTOCOL_ICMP, key0.port, key0.port, thread_index, sw_if_index0))) + { + dont_translate = 1; + goto out; + } + } + else + { + if (PREDICT_FALSE(snat_not_translate(sm, node, sw_if_index0, + ip0, SNAT_PROTOCOL_ICMP, rx_fib_index0, thread_index))) + { + dont_translate = 1; + goto out; + } } if (PREDICT_FALSE(icmp_is_error_message (icmp0))) @@ -589,8 +636,34 @@ u32 icmp_match_in2out_slow(snat_main_t *sm, vlib_node_runtime_t *node, goto out; } - s0 = pool_elt_at_index (sm->per_thread_data[thread_index].sessions, - value0.value); + if (PREDICT_FALSE (value0.value == ~0ULL)) + { + nat_ed_ses_key_t key; + clib_bihash_kv_16_8_t s_kv, s_value; + + key.as_u64[0] = 0; + key.as_u64[1] = 0; + if (icmp_get_ed_key (ip0, &key)) + { + b0->error = node->errors[SNAT_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL]; + next0 = SNAT_IN2OUT_NEXT_DROP; + goto out; + } + key.fib_index = rx_fib_index0; + s_kv.key[0] = key.as_u64[0]; + s_kv.key[1] = key.as_u64[1]; + if (!clib_bihash_search_16_8 (&sm->in2out_ed, &s_kv, &s_value)) + s0 = pool_elt_at_index (sm->per_thread_data[thread_index].sessions, + s_value.value); + else + { + next0 = SNAT_IN2OUT_NEXT_DROP; + goto out; + } + } + else + s0 = pool_elt_at_index (sm->per_thread_data[thread_index].sessions, + value0.value); } out: @@ -645,7 +718,7 @@ u32 icmp_match_in2out_fast(snat_main_t *sm, vlib_node_runtime_t *node, } key0.fib_index = rx_fib_index0; - if (snat_static_mapping_match(sm, key0, &sm0, 0, &is_addr_only)) + if (snat_static_mapping_match(sm, key0, &sm0, 0, &is_addr_only, 0, 0)) { if (PREDICT_FALSE(snat_not_translate_fast(sm, node, sw_if_index0, ip0, IP_PROTOCOL_ICMP, rx_fib_index0))) @@ -735,6 +808,9 @@ static inline u32 icmp_in2out (snat_main_t *sm, src_address /* changed member */); ip0->checksum = ip_csum_fold (sum0); + if (icmp0->checksum == 0) + icmp0->checksum = 0xffff; + if (!icmp_is_error_message (icmp0)) { new_id0 = sm0.port; @@ -841,7 +917,7 @@ snat_hairpinning (snat_main_t *sm, kv0.key = key0.as_u64; /* Check if destination is static mappings */ - if (!snat_static_mapping_match(sm, key0, &sm0, 1, 0)) + if (!snat_static_mapping_match(sm, key0, &sm0, 1, 0, 0, 0)) { new_dst_addr0 = sm0.addr.as_u32; new_dst_port0 = sm0.port; @@ -942,7 +1018,7 @@ snat_icmp_hairpinning (snat_main_t *sm, &value0)) { /* or static mappings */ - if (!snat_static_mapping_match(sm, key0, &sm0, 1, 0)) + if (!snat_static_mapping_match(sm, key0, &sm0, 1, 0, 0, 0)) { new_dst_addr0 = sm0.addr.as_u32; vnet_buffer(b0)->sw_if_index[VLIB_TX] = sm0.fib_index; @@ -1000,15 +1076,12 @@ static inline u32 icmp_in2out_slow_path (snat_main_t *sm, s0->last_heard = now; s0->total_pkts++; s0->total_bytes += vlib_buffer_length_in_chain (sm->vlib_main, b0); - /* Per-user LRU list maintenance for dynamic translations */ - if (!snat_is_session_static (s0)) - { - clib_dlist_remove (sm->per_thread_data[thread_index].list_pool, - s0->per_user_index); - clib_dlist_addtail (sm->per_thread_data[thread_index].list_pool, - s0->per_user_list_head_index, - s0->per_user_index); - } + /* Per-user LRU list maintenance */ + clib_dlist_remove (sm->per_thread_data[thread_index].list_pool, + s0->per_user_index); + clib_dlist_addtail (sm->per_thread_data[thread_index].list_pool, + s0->per_user_list_head_index, + s0->per_user_index); } return next0; } @@ -1031,7 +1104,7 @@ snat_hairpinning_unknown_proto (snat_main_t *sm, key.r_addr.as_u32 = ip->src_address.as_u32; key.fib_index = sm->outside_fib_index; key.proto = ip->protocol; - key.rsvd = 0; + key.r_port = 0; key.l_port = 0; s_kv.key[0] = key.as_u64[0]; s_kv.key[1] = key.as_u64[1]; @@ -1083,11 +1156,10 @@ snat_in2out_unknown_proto (snat_main_t *sm, snat_session_key_t m_key; u32 old_addr, new_addr = 0; ip_csum_t sum; - snat_user_key_t u_key; snat_user_t *u; - dlist_elt_t *head, *elt, *oldest; + dlist_elt_t *head, *elt; snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index]; - u32 elt_index, head_index, ses_index, oldest_index; + u32 elt_index, head_index, ses_index; snat_session_t * s; nat_ed_ses_key_t key; u32 address_index = ~0; @@ -1100,8 +1172,8 @@ snat_in2out_unknown_proto (snat_main_t *sm, key.r_addr = ip->dst_address; key.fib_index = rx_fib_index; key.proto = ip->protocol; - key.rsvd = 0; key.l_port = 0; + key.r_port = 0; s_kv.key[0] = key.as_u64[0]; s_kv.key[1] = key.as_u64[1]; @@ -1115,36 +1187,16 @@ snat_in2out_unknown_proto (snat_main_t *sm, if (PREDICT_FALSE (maximum_sessions_exceeded(sm, thread_index))) { b->error = node->errors[SNAT_IN2OUT_ERROR_MAX_SESSIONS_EXCEEDED]; + nat_ipfix_logging_max_sessions(sm->max_translations); return 0; } - u_key.addr = ip->src_address; - u_key.fib_index = rx_fib_index; - kv.key = u_key.as_u64; - - /* Ever heard of the "user" = src ip4 address before? */ - if (clib_bihash_search_8_8 (&tsm->user_hash, &kv, &value)) - { - /* no, make a new one */ - pool_get (tsm->users, u); - memset (u, 0, sizeof (*u)); - u->addr = ip->src_address; - u->fib_index = rx_fib_index; - - pool_get (tsm->list_pool, head); - u->sessions_per_user_list_head_index = head - tsm->list_pool; - - clib_dlist_init (tsm->list_pool, - u->sessions_per_user_list_head_index); - - kv.value = u - tsm->users; - - /* add user */ - clib_bihash_add_del_8_8 (&tsm->user_hash, &kv, 1); - } - else + u = nat_user_get_or_create (sm, &ip->src_address, rx_fib_index, + thread_index); + if (!u) { - u = pool_elt_at_index (tsm->users, value.value); + clib_warning ("create NAT user failed"); + return 0; } m_key.addr = ip->src_address; @@ -1212,91 +1264,16 @@ snat_in2out_unknown_proto (snat_main_t *sm, } create_ses: - /* Over quota? Recycle the least recently used dynamic translation */ - if (u->nsessions >= sm->max_translations_per_user && !is_sm) - { - /* Remove the oldest dynamic translation */ - do { - oldest_index = clib_dlist_remove_head ( - tsm->list_pool, u->sessions_per_user_list_head_index); - - ASSERT (oldest_index != ~0); - - /* add it back to the end of the LRU list */ - clib_dlist_addtail (tsm->list_pool, - u->sessions_per_user_list_head_index, - oldest_index); - /* Get the list element */ - oldest = pool_elt_at_index (tsm->list_pool, oldest_index); - - /* Get the session index from the list element */ - ses_index = oldest->value; - - /* Get the session */ - s = pool_elt_at_index (tsm->sessions, ses_index); - } while (snat_is_session_static (s)); - - if (snat_is_unk_proto_session (s)) - { - /* Remove from lookup tables */ - key.l_addr = s->in2out.addr; - key.r_addr = s->ext_host_addr; - key.fib_index = s->in2out.fib_index; - key.proto = s->in2out.port; - s_kv.key[0] = key.as_u64[0]; - s_kv.key[1] = key.as_u64[1]; - if (clib_bihash_add_del_16_8 (&sm->in2out_ed, &s_kv, 0)) - clib_warning ("in2out key del failed"); - - key.l_addr = s->out2in.addr; - key.fib_index = s->out2in.fib_index; - s_kv.key[0] = key.as_u64[0]; - s_kv.key[1] = key.as_u64[1]; - if (clib_bihash_add_del_16_8 (&sm->out2in_ed, &s_kv, 0)) - clib_warning ("out2in key del failed"); - } - else - { - /* log NAT event */ - snat_ipfix_logging_nat44_ses_delete(s->in2out.addr.as_u32, - s->out2in.addr.as_u32, - s->in2out.protocol, - s->in2out.port, - s->out2in.port, - s->in2out.fib_index); - - snat_free_outside_address_and_port (sm, thread_index, &s->out2in, - s->outside_address_index); - - /* Remove in2out, out2in keys */ - kv.key = s->in2out.as_u64; - if (clib_bihash_add_del_8_8 ( - &sm->per_thread_data[thread_index].in2out, &kv, 0)) - clib_warning ("in2out key del failed"); - kv.key = s->out2in.as_u64; - if (clib_bihash_add_del_8_8 ( - &sm->per_thread_data[thread_index].out2in, &kv, 0)) - clib_warning ("out2in key del failed"); - } - } - else + s = nat_session_alloc_or_recycle (sm, u, thread_index); + if (!s) { - /* Create a new session */ - pool_get (tsm->sessions, s); - memset (s, 0, sizeof (*s)); - - /* Create list elts */ - pool_get (tsm->list_pool, elt); - clib_dlist_init (tsm->list_pool, elt - tsm->list_pool); - elt->value = s - tsm->sessions; - s->per_user_index = elt - tsm->list_pool; - s->per_user_list_head_index = u->sessions_per_user_list_head_index; - clib_dlist_addtail (tsm->list_pool, s->per_user_list_head_index, - s->per_user_index); + clib_warning ("create NAT session failed"); + return 0; } s->ext_host_addr.as_u32 = ip->dst_address.as_u32; s->flags |= SNAT_SESSION_FLAG_UNKNOWN_PROTO; + s->flags |= SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT; s->outside_address_index = address_index; s->out2in.addr.as_u32 = new_addr; s->out2in.fib_index = sm->outside_fib_index; @@ -1304,14 +1281,8 @@ create_ses: s->in2out.fib_index = rx_fib_index; s->in2out.port = s->out2in.port = ip->protocol; if (is_sm) - { - u->nstaticsessions++; - s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING; - } - else - { - u->nsessions++; - } + s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING; + user_session_increment (sm, u, is_sm); /* Add to lookup tables */ key.l_addr.as_u32 = old_addr; @@ -1377,10 +1348,8 @@ snat_in2out_lb (snat_main_t *sm, ip_csum_t sum; u32 proto = ip_proto_to_snat_proto (ip->protocol); snat_session_key_t e_key, l_key; - clib_bihash_kv_8_8_t kv, value; - snat_user_key_t u_key; snat_user_t *u; - dlist_elt_t *head, *elt; + u8 lb; old_addr = ip->src_address.as_u32; @@ -1388,7 +1357,7 @@ snat_in2out_lb (snat_main_t *sm, key.r_addr = ip->dst_address; key.fib_index = rx_fib_index; key.proto = ip->protocol; - key.rsvd = 0; + key.r_port = udp->dst_port; key.l_port = udp->src_port; s_kv.key[0] = key.as_u64[0]; s_kv.key[1] = key.as_u64[1]; @@ -1396,12 +1365,15 @@ snat_in2out_lb (snat_main_t *sm, if (!clib_bihash_search_16_8 (&sm->in2out_ed, &s_kv, &s_value)) { s = pool_elt_at_index (tsm->sessions, s_value.value); + if (is_fwd_bypass_session (s)) + return 0; } else { if (PREDICT_FALSE (maximum_sessions_exceeded (sm, thread_index))) { b->error = node->errors[SNAT_IN2OUT_ERROR_MAX_SESSIONS_EXCEEDED]; + nat_ipfix_logging_max_sessions(sm->max_translations); return 0; } @@ -1409,59 +1381,34 @@ snat_in2out_lb (snat_main_t *sm, l_key.port = udp->src_port; l_key.protocol = proto; l_key.fib_index = rx_fib_index; - if (snat_static_mapping_match(sm, l_key, &e_key, 0, 0)) + if (snat_static_mapping_match(sm, l_key, &e_key, 0, 0, 0, &lb)) return 0; - u_key.addr = ip->src_address; - u_key.fib_index = rx_fib_index; - kv.key = u_key.as_u64; - - /* Ever heard of the "user" = src ip4 address before? */ - if (clib_bihash_search_8_8 (&tsm->user_hash, &kv, &value)) + u = nat_user_get_or_create (sm, &ip->src_address, rx_fib_index, + thread_index); + if (!u) { - /* no, make a new one */ - pool_get (tsm->users, u); - memset (u, 0, sizeof (*u)); - u->addr = ip->src_address; - u->fib_index = rx_fib_index; - - pool_get (tsm->list_pool, head); - u->sessions_per_user_list_head_index = head - tsm->list_pool; - - clib_dlist_init (tsm->list_pool, - u->sessions_per_user_list_head_index); - - kv.value = u - tsm->users; - - /* add user */ - if (clib_bihash_add_del_8_8 (&tsm->user_hash, &kv, 1)) - clib_warning ("user key add failed"); + clib_warning ("create NAT user failed"); + return 0; } - else + + s = nat_session_alloc_or_recycle (sm, u, thread_index); + if (!s) { - u = pool_elt_at_index (tsm->users, value.value); + clib_warning ("create NAT session failed"); + return 0; } - /* Create a new session */ - pool_get (tsm->sessions, s); - memset (s, 0, sizeof (*s)); - s->ext_host_addr.as_u32 = ip->dst_address.as_u32; s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING; - s->flags |= SNAT_SESSION_FLAG_LOAD_BALANCING; + if (lb) + s->flags |= SNAT_SESSION_FLAG_LOAD_BALANCING; + s->flags |= SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT; s->outside_address_index = ~0; s->in2out = l_key; s->out2in = e_key; - u->nstaticsessions++; - - /* Create list elts */ - pool_get (tsm->list_pool, elt); - clib_dlist_init (tsm->list_pool, elt - tsm->list_pool); - elt->value = s - tsm->sessions; - s->per_user_index = elt - tsm->list_pool; - s->per_user_list_head_index = u->sessions_per_user_list_head_index; - clib_dlist_addtail (tsm->list_pool, s->per_user_list_head_index, - s->per_user_index); + s->out2in.protocol = l_key.protocol; + user_session_increment (sm, u, 1 /* static */); /* Add to lookup tables */ s_kv.value = s - tsm->sessions; @@ -1482,6 +1429,9 @@ snat_in2out_lb (snat_main_t *sm, /* Update IP checksum */ sum = ip->checksum; sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, src_address); + if (is_twice_nat_session (s)) + sum = ip_csum_update (sum, ip->dst_address.as_u32, + s->ext_host_addr.as_u32, ip4_header_t, dst_address); ip->checksum = ip_csum_fold (sum); if (PREDICT_TRUE(proto == SNAT_PROTOCOL_TCP)) @@ -1493,11 +1443,26 @@ snat_in2out_lb (snat_main_t *sm, sum = tcp->checksum; sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, src_address); sum = ip_csum_update (sum, old_port, new_port, ip4_header_t, length); + if (is_twice_nat_session (s)) + { + sum = ip_csum_update (sum, ip->dst_address.as_u32, + s->ext_host_addr.as_u32, ip4_header_t, + dst_address); + sum = ip_csum_update (sum, tcp->dst_port, s->ext_host_port, + ip4_header_t, length); + tcp->dst_port = s->ext_host_port; + ip->dst_address.as_u32 = s->ext_host_addr.as_u32; + } tcp->checksum = ip_csum_fold(sum); } else { udp->src_port = s->out2in.port; + if (is_twice_nat_session (s)) + { + udp->dst_port = s->ext_host_port; + ip->dst_address.as_u32 = s->ext_host_addr.as_u32; + } udp->checksum = 0; } @@ -1508,6 +1473,10 @@ snat_in2out_lb (snat_main_t *sm, s->last_heard = now; s->total_pkts++; s->total_bytes += vlib_buffer_length_in_chain (vm, b); + /* Per-user LRU list maintenance */ + clib_dlist_remove (tsm->list_pool, s->per_user_index); + clib_dlist_addtail (tsm->list_pool, s->per_user_list_head_index, + s->per_user_index); return s; } @@ -1634,11 +1603,23 @@ snat_in2out_node_fn_inline (vlib_main_t * vm, } else { + if (is_output_feature) + { + if (PREDICT_FALSE(nat_not_translate_output_feature_fwd(sm, ip0, thread_index))) + goto trace00; + } + if (PREDICT_FALSE (proto0 == ~0 || proto0 == SNAT_PROTOCOL_ICMP)) { next0 = SNAT_IN2OUT_NEXT_SLOW_PATH; goto trace00; } + + if (ip4_is_fragment (ip0)) + { + next0 = SNAT_IN2OUT_NEXT_REASS; + goto trace00; + } } key0.addr = ip0->src_address; @@ -1653,9 +1634,18 @@ snat_in2out_node_fn_inline (vlib_main_t * vm, { if (is_slow_path) { - if (PREDICT_FALSE(snat_not_translate(sm, node, sw_if_index0, - ip0, proto0, rx_fib_index0, thread_index)) && !is_output_feature) - goto trace00; + if (is_output_feature) + { + if (PREDICT_FALSE(nat_not_translate_output_feature(sm, + ip0, proto0, udp0->src_port, udp0->dst_port, thread_index, sw_if_index0))) + goto trace00; + } + else + { + if (PREDICT_FALSE(snat_not_translate(sm, node, sw_if_index0, + ip0, proto0, rx_fib_index0, thread_index))) + goto trace00; + } next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0, &s0, node, next0, thread_index); @@ -1676,7 +1666,7 @@ snat_in2out_node_fn_inline (vlib_main_t * vm, { s0 = snat_in2out_lb(sm, b0, ip0, rx_fib_index0, thread_index, now, vm, node); - if (!s0) + if (!s0 && !sm->forwarding_enabled) next0 = SNAT_IN2OUT_NEXT_DROP; goto trace00; } @@ -1734,15 +1724,12 @@ snat_in2out_node_fn_inline (vlib_main_t * vm, s0->last_heard = now; s0->total_pkts++; s0->total_bytes += vlib_buffer_length_in_chain (vm, b0); - /* Per-user LRU list maintenance for dynamic translation */ - if (!snat_is_session_static (s0)) - { - clib_dlist_remove (sm->per_thread_data[thread_index].list_pool, - s0->per_user_index); - clib_dlist_addtail (sm->per_thread_data[thread_index].list_pool, - s0->per_user_list_head_index, - s0->per_user_index); - } + /* Per-user LRU list maintenance */ + clib_dlist_remove (sm->per_thread_data[thread_index].list_pool, + s0->per_user_index); + clib_dlist_addtail (sm->per_thread_data[thread_index].list_pool, + s0->per_user_list_head_index, + s0->per_user_index); trace00: if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE) @@ -1808,14 +1795,24 @@ snat_in2out_node_fn_inline (vlib_main_t * vm, } else { - if (PREDICT_FALSE (proto1 == ~0 || proto1 == SNAT_PROTOCOL_ICMP)) + if (is_output_feature) { - next1 = SNAT_IN2OUT_NEXT_SLOW_PATH; + if (PREDICT_FALSE(nat_not_translate_output_feature_fwd(sm, ip1, thread_index))) + goto trace01; + } + + if (PREDICT_FALSE (proto1 == ~0 || proto1 == SNAT_PROTOCOL_ICMP)) + { + next1 = SNAT_IN2OUT_NEXT_SLOW_PATH; goto trace01; } - } - b1->flags |= VNET_BUFFER_F_IS_NATED; + if (ip4_is_fragment (ip1)) + { + next1 = SNAT_IN2OUT_NEXT_REASS; + goto trace01; + } + } key1.addr = ip1->src_address; key1.port = udp1->src_port; @@ -1829,9 +1826,18 @@ snat_in2out_node_fn_inline (vlib_main_t * vm, { if (is_slow_path) { - if (PREDICT_FALSE(snat_not_translate(sm, node, sw_if_index1, - ip1, proto1, rx_fib_index1, thread_index)) && !is_output_feature) - goto trace01; + if (is_output_feature) + { + if (PREDICT_FALSE(nat_not_translate_output_feature(sm, + ip1, proto1, udp1->src_port, udp1->dst_port, thread_index, sw_if_index1))) + goto trace01; + } + else + { + if (PREDICT_FALSE(snat_not_translate(sm, node, sw_if_index1, + ip1, proto1, rx_fib_index1, thread_index))) + goto trace01; + } next1 = slow_path (sm, b1, ip1, rx_fib_index1, &key1, &s1, node, next1, thread_index); @@ -1852,7 +1858,7 @@ snat_in2out_node_fn_inline (vlib_main_t * vm, { s1 = snat_in2out_lb(sm, b1, ip1, rx_fib_index1, thread_index, now, vm, node); - if (!s1) + if (!s1 && !sm->forwarding_enabled) next1 = SNAT_IN2OUT_NEXT_DROP; goto trace01; } @@ -1870,6 +1876,8 @@ snat_in2out_node_fn_inline (vlib_main_t * vm, } } + b1->flags |= VNET_BUFFER_F_IS_NATED; + old_addr1 = ip1->src_address.as_u32; ip1->src_address = s1->out2in.addr; new_addr1 = ip1->src_address.as_u32; @@ -1908,15 +1916,12 @@ snat_in2out_node_fn_inline (vlib_main_t * vm, s1->last_heard = now; s1->total_pkts++; s1->total_bytes += vlib_buffer_length_in_chain (vm, b1); - /* Per-user LRU list maintenance for dynamic translation */ - if (!snat_is_session_static (s1)) - { - clib_dlist_remove (sm->per_thread_data[thread_index].list_pool, - s1->per_user_index); - clib_dlist_addtail (sm->per_thread_data[thread_index].list_pool, - s1->per_user_list_head_index, - s1->per_user_index); - } + /* Per-user LRU list maintenance */ + clib_dlist_remove (sm->per_thread_data[thread_index].list_pool, + s1->per_user_index); + clib_dlist_addtail (sm->per_thread_data[thread_index].list_pool, + s1->per_user_list_head_index, + s1->per_user_index); trace01: if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE) @@ -2018,11 +2023,23 @@ snat_in2out_node_fn_inline (vlib_main_t * vm, } else { + if (is_output_feature) + { + if (PREDICT_FALSE(nat_not_translate_output_feature_fwd(sm, ip0, thread_index))) + goto trace0; + } + if (PREDICT_FALSE (proto0 == ~0 || proto0 == SNAT_PROTOCOL_ICMP)) { next0 = SNAT_IN2OUT_NEXT_SLOW_PATH; goto trace0; } + + if (ip4_is_fragment (ip0)) + { + next0 = SNAT_IN2OUT_NEXT_REASS; + goto trace0; + } } key0.addr = ip0->src_address; @@ -2037,9 +2054,18 @@ snat_in2out_node_fn_inline (vlib_main_t * vm, { if (is_slow_path) { - if (PREDICT_FALSE(snat_not_translate(sm, node, sw_if_index0, - ip0, proto0, rx_fib_index0, thread_index)) && !is_output_feature) - goto trace0; + if (is_output_feature) + { + if (PREDICT_FALSE(nat_not_translate_output_feature(sm, + ip0, proto0, udp0->src_port, udp0->dst_port, thread_index, sw_if_index0))) + goto trace0; + } + else + { + if (PREDICT_FALSE(snat_not_translate(sm, node, sw_if_index0, + ip0, proto0, rx_fib_index0, thread_index))) + goto trace0; + } next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0, &s0, node, next0, thread_index); @@ -2061,7 +2087,7 @@ snat_in2out_node_fn_inline (vlib_main_t * vm, { s0 = snat_in2out_lb(sm, b0, ip0, rx_fib_index0, thread_index, now, vm, node); - if (!s0) + if (!s0 && !sm->forwarding_enabled) next0 = SNAT_IN2OUT_NEXT_DROP; goto trace0; } @@ -2119,15 +2145,12 @@ snat_in2out_node_fn_inline (vlib_main_t * vm, s0->last_heard = now; s0->total_pkts++; s0->total_bytes += vlib_buffer_length_in_chain (vm, b0); - /* Per-user LRU list maintenance for dynamic translation */ - if (!snat_is_session_static (s0)) - { - clib_dlist_remove (sm->per_thread_data[thread_index].list_pool, - s0->per_user_index); - clib_dlist_addtail (sm->per_thread_data[thread_index].list_pool, - s0->per_user_list_head_index, - s0->per_user_index); - } + /* Per-user LRU list maintenance */ + clib_dlist_remove (sm->per_thread_data[thread_index].list_pool, + s0->per_user_index); + clib_dlist_addtail (sm->per_thread_data[thread_index].list_pool, + s0->per_user_list_head_index, + s0->per_user_index); trace0: if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE) @@ -2188,6 +2211,7 @@ VLIB_REGISTER_NODE (snat_in2out_node) = { [SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup", [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-slowpath", [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error", + [SNAT_IN2OUT_NEXT_REASS] = "nat44-in2out-reass", }, }; @@ -2221,6 +2245,7 @@ VLIB_REGISTER_NODE (snat_in2out_output_node) = { [SNAT_IN2OUT_NEXT_LOOKUP] = "interface-output", [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-output-slowpath", [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error", + [SNAT_IN2OUT_NEXT_REASS] = "nat44-in2out-reass", }, }; @@ -2255,6 +2280,7 @@ VLIB_REGISTER_NODE (snat_in2out_slowpath_node) = { [SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup", [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-slowpath", [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error", + [SNAT_IN2OUT_NEXT_REASS] = "nat44-in2out-reass", }, }; @@ -2289,6 +2315,7 @@ VLIB_REGISTER_NODE (snat_in2out_output_slowpath_node) = { [SNAT_IN2OUT_NEXT_LOOKUP] = "interface-output", [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-output-slowpath", [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error", + [SNAT_IN2OUT_NEXT_REASS] = "nat44-in2out-reass", }, }; @@ -2386,6 +2413,368 @@ VLIB_REGISTER_NODE (nat44_hairpinning_node) = { VLIB_NODE_FUNCTION_MULTIARCH (nat44_hairpinning_node, nat44_hairpinning_fn); +static inline void +nat44_reass_hairpinning (snat_main_t *sm, + vlib_buffer_t * b0, + ip4_header_t * ip0, + u16 sport, + u16 dport, + u32 proto0) +{ + snat_session_key_t key0, sm0; + snat_session_t * s0; + clib_bihash_kv_8_8_t kv0, value0; + ip_csum_t sum0; + u32 new_dst_addr0 = 0, old_dst_addr0, ti = 0, si; + u16 new_dst_port0, old_dst_port0; + udp_header_t * udp0; + tcp_header_t * tcp0; + + key0.addr = ip0->dst_address; + key0.port = dport; + key0.protocol = proto0; + key0.fib_index = sm->outside_fib_index; + kv0.key = key0.as_u64; + + udp0 = ip4_next_header (ip0); + + /* Check if destination is static mappings */ + if (!snat_static_mapping_match(sm, key0, &sm0, 1, 0, 0, 0)) + { + new_dst_addr0 = sm0.addr.as_u32; + new_dst_port0 = sm0.port; + vnet_buffer(b0)->sw_if_index[VLIB_TX] = sm0.fib_index; + } + /* or active sessions */ + else + { + if (sm->num_workers > 1) + ti = (clib_net_to_host_u16 (udp0->dst_port) - 1024) / sm->port_per_thread; + else + ti = sm->num_workers; + + if (!clib_bihash_search_8_8 (&sm->per_thread_data[ti].out2in, &kv0, &value0)) + { + si = value0.value; + s0 = pool_elt_at_index (sm->per_thread_data[ti].sessions, si); + new_dst_addr0 = s0->in2out.addr.as_u32; + new_dst_port0 = s0->in2out.port; + vnet_buffer(b0)->sw_if_index[VLIB_TX] = s0->in2out.fib_index; + } + } + + /* Destination is behind the same NAT, use internal address and port */ + if (new_dst_addr0) + { + old_dst_addr0 = ip0->dst_address.as_u32; + ip0->dst_address.as_u32 = new_dst_addr0; + sum0 = ip0->checksum; + sum0 = ip_csum_update (sum0, old_dst_addr0, new_dst_addr0, + ip4_header_t, dst_address); + ip0->checksum = ip_csum_fold (sum0); + + old_dst_port0 = dport; + if (PREDICT_TRUE(new_dst_port0 != old_dst_port0 && + ip4_is_first_fragment (ip0))) + { + if (PREDICT_TRUE(proto0 == SNAT_PROTOCOL_TCP)) + { + tcp0 = ip4_next_header (ip0); + tcp0->dst = new_dst_port0; + sum0 = tcp0->checksum; + sum0 = ip_csum_update (sum0, old_dst_addr0, new_dst_addr0, + ip4_header_t, dst_address); + sum0 = ip_csum_update (sum0, old_dst_port0, new_dst_port0, + ip4_header_t /* cheat */, length); + tcp0->checksum = ip_csum_fold(sum0); + } + else + { + udp0->dst_port = new_dst_port0; + udp0->checksum = 0; + } + } + else + { + if (PREDICT_TRUE(proto0 == SNAT_PROTOCOL_TCP)) + { + tcp0 = ip4_next_header (ip0); + sum0 = tcp0->checksum; + sum0 = ip_csum_update (sum0, old_dst_addr0, new_dst_addr0, + ip4_header_t, dst_address); + tcp0->checksum = ip_csum_fold(sum0); + } + } + } +} + +static uword +nat44_in2out_reass_node_fn (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + u32 n_left_from, *from, *to_next; + snat_in2out_next_t next_index; + u32 pkts_processed = 0; + snat_main_t *sm = &snat_main; + f64 now = vlib_time_now (vm); + u32 thread_index = vlib_get_thread_index (); + snat_main_per_thread_data_t *per_thread_data = + &sm->per_thread_data[thread_index]; + u32 *fragments_to_drop = 0; + u32 *fragments_to_loopback = 0; + + from = vlib_frame_vector_args (frame); + n_left_from = frame->n_vectors; + next_index = node->cached_next_index; + + while (n_left_from > 0) + { + u32 n_left_to_next; + + vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); + + while (n_left_from > 0 && n_left_to_next > 0) + { + u32 bi0, sw_if_index0, proto0, rx_fib_index0, new_addr0, old_addr0; + vlib_buffer_t *b0; + u32 next0; + u8 cached0 = 0; + ip4_header_t *ip0; + nat_reass_ip4_t *reass0; + udp_header_t * udp0; + tcp_header_t * tcp0; + snat_session_key_t key0; + clib_bihash_kv_8_8_t kv0, value0; + snat_session_t * s0 = 0; + u16 old_port0, new_port0; + ip_csum_t sum0; + + /* speculatively enqueue b0 to the current next frame */ + bi0 = from[0]; + to_next[0] = bi0; + from += 1; + to_next += 1; + n_left_from -= 1; + n_left_to_next -= 1; + + b0 = vlib_get_buffer (vm, bi0); + next0 = SNAT_IN2OUT_NEXT_LOOKUP; + + sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX]; + rx_fib_index0 = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4, + sw_if_index0); + + if (PREDICT_FALSE (nat_reass_is_drop_frag(0))) + { + next0 = SNAT_IN2OUT_NEXT_DROP; + b0->error = node->errors[SNAT_IN2OUT_ERROR_DROP_FRAGMENT]; + goto trace0; + } + + ip0 = (ip4_header_t *) vlib_buffer_get_current (b0); + udp0 = ip4_next_header (ip0); + tcp0 = (tcp_header_t *) udp0; + proto0 = ip_proto_to_snat_proto (ip0->protocol); + + reass0 = nat_ip4_reass_find_or_create (ip0->src_address, + ip0->dst_address, + ip0->fragment_id, + ip0->protocol, + 1, + &fragments_to_drop); + + if (PREDICT_FALSE (!reass0)) + { + next0 = SNAT_IN2OUT_NEXT_DROP; + b0->error = node->errors[SNAT_IN2OUT_ERROR_MAX_REASS]; + goto trace0; + } + + if (PREDICT_FALSE (ip4_is_first_fragment (ip0))) + { + key0.addr = ip0->src_address; + key0.port = udp0->src_port; + key0.protocol = proto0; + key0.fib_index = rx_fib_index0; + kv0.key = key0.as_u64; + + if (clib_bihash_search_8_8 (&per_thread_data->in2out, &kv0, &value0)) + { + if (PREDICT_FALSE(snat_not_translate(sm, node, sw_if_index0, + ip0, proto0, rx_fib_index0, thread_index))) + goto trace0; + + next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0, + &s0, node, next0, thread_index); + + if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP)) + goto trace0; + + reass0->sess_index = s0 - per_thread_data->sessions; + } + else + { + s0 = pool_elt_at_index (per_thread_data->sessions, + value0.value); + reass0->sess_index = value0.value; + } + nat_ip4_reass_get_frags (reass0, &fragments_to_loopback); + } + else + { + if (PREDICT_FALSE (reass0->sess_index == (u32) ~0)) + { + if (nat_ip4_reass_add_fragment (reass0, bi0)) + { + b0->error = node->errors[SNAT_IN2OUT_ERROR_MAX_FRAG]; + next0 = SNAT_IN2OUT_NEXT_DROP; + goto trace0; + } + cached0 = 1; + goto trace0; + } + s0 = pool_elt_at_index (per_thread_data->sessions, + reass0->sess_index); + } + + old_addr0 = ip0->src_address.as_u32; + ip0->src_address = s0->out2in.addr; + new_addr0 = ip0->src_address.as_u32; + vnet_buffer(b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index; + + sum0 = ip0->checksum; + sum0 = ip_csum_update (sum0, old_addr0, new_addr0, + ip4_header_t, + src_address /* changed member */); + ip0->checksum = ip_csum_fold (sum0); + + if (PREDICT_FALSE (ip4_is_first_fragment (ip0))) + { + if (PREDICT_TRUE(proto0 == SNAT_PROTOCOL_TCP)) + { + old_port0 = tcp0->src_port; + tcp0->src_port = s0->out2in.port; + new_port0 = tcp0->src_port; + + sum0 = tcp0->checksum; + sum0 = ip_csum_update (sum0, old_addr0, new_addr0, + ip4_header_t, + dst_address /* changed member */); + sum0 = ip_csum_update (sum0, old_port0, new_port0, + ip4_header_t /* cheat */, + length /* changed member */); + tcp0->checksum = ip_csum_fold(sum0); + } + else + { + old_port0 = udp0->src_port; + udp0->src_port = s0->out2in.port; + udp0->checksum = 0; + } + } + + /* Hairpinning */ + nat44_reass_hairpinning (sm, b0, ip0, s0->out2in.port, + s0->ext_host_port, proto0); + + /* Accounting */ + s0->last_heard = now; + s0->total_pkts++; + s0->total_bytes += vlib_buffer_length_in_chain (vm, b0); + /* Per-user LRU list maintenance */ + clib_dlist_remove (sm->per_thread_data[thread_index].list_pool, + s0->per_user_index); + clib_dlist_addtail (sm->per_thread_data[thread_index].list_pool, + s0->per_user_list_head_index, + s0->per_user_index); + + trace0: + if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE) + && (b0->flags & VLIB_BUFFER_IS_TRACED))) + { + nat44_in2out_reass_trace_t *t = + vlib_add_trace (vm, node, b0, sizeof (*t)); + t->cached = cached0; + t->sw_if_index = sw_if_index0; + t->next_index = next0; + } + + if (cached0) + { + n_left_to_next++; + to_next--; + } + else + { + pkts_processed += next0 != SNAT_IN2OUT_NEXT_DROP; + + /* verify speculative enqueue, maybe switch current next frame */ + vlib_validate_buffer_enqueue_x1 (vm, node, next_index, + to_next, n_left_to_next, + bi0, next0); + } + + if (n_left_from == 0 && vec_len (fragments_to_loopback)) + { + from = vlib_frame_vector_args (frame); + u32 len = vec_len (fragments_to_loopback); + if (len <= VLIB_FRAME_SIZE) + { + clib_memcpy (from, fragments_to_loopback, sizeof (u32) * len); + n_left_from = len; + vec_reset_length (fragments_to_loopback); + } + else + { + clib_memcpy (from, + fragments_to_loopback + (len - VLIB_FRAME_SIZE), + sizeof (u32) * VLIB_FRAME_SIZE); + n_left_from = VLIB_FRAME_SIZE; + _vec_len (fragments_to_loopback) = len - VLIB_FRAME_SIZE; + } + } + } + + vlib_put_next_frame (vm, node, next_index, n_left_to_next); + } + + vlib_node_increment_counter (vm, nat44_in2out_reass_node.index, + SNAT_IN2OUT_ERROR_IN2OUT_PACKETS, + pkts_processed); + + nat_send_all_to_node (vm, fragments_to_drop, node, + &node->errors[SNAT_IN2OUT_ERROR_DROP_FRAGMENT], + SNAT_IN2OUT_NEXT_DROP); + + vec_free (fragments_to_drop); + vec_free (fragments_to_loopback); + return frame->n_vectors; +} + +VLIB_REGISTER_NODE (nat44_in2out_reass_node) = { + .function = nat44_in2out_reass_node_fn, + .name = "nat44-in2out-reass", + .vector_size = sizeof (u32), + .format_trace = format_nat44_in2out_reass_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + + .n_errors = ARRAY_LEN(snat_in2out_error_strings), + .error_strings = snat_in2out_error_strings, + + .n_next_nodes = SNAT_IN2OUT_N_NEXT, + .next_nodes = { + [SNAT_IN2OUT_NEXT_DROP] = "error-drop", + [SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup", + [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-slowpath", + [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error", + [SNAT_IN2OUT_NEXT_REASS] = "nat44-in2out-reass", + }, +}; + +VLIB_NODE_FUNCTION_MULTIARCH (nat44_in2out_reass_node, + nat44_in2out_reass_node_fn); + /**************************/ /*** deterministic mode ***/ /**************************/ @@ -3442,7 +3831,6 @@ snat_hairpin_dst_fn (vlib_main_t * vm, } vnet_buffer (b0)->snat.flags = SNAT_FLAG_HAIRPINNING; - clib_warning("is hairpinning"); } pkts_processed += next0 != SNAT_IN2OUT_NEXT_DROP; @@ -3523,7 +3911,7 @@ snat_hairpin_src_fn (vlib_main_t * vm, pool_foreach (i, sm->output_feature_interfaces, ({ /* Only packets from NAT inside interface */ - if ((i->is_inside == 1) && (sw_if_index0 == i->sw_if_index)) + if ((nat_interface_is_inside(i)) && (sw_if_index0 == i->sw_if_index)) { if (PREDICT_FALSE ((vnet_buffer (b0)->snat.flags) & SNAT_FLAG_HAIRPINNING)) @@ -3660,7 +4048,7 @@ snat_in2out_fast_static_map_fn (vlib_main_t * vm, key0.port = udp0->src_port; key0.fib_index = rx_fib_index0; - if (snat_static_mapping_match(sm, key0, &sm0, 0, 0)) + if (snat_static_mapping_match(sm, key0, &sm0, 0, 0, 0, 0)) { b0->error = node->errors[SNAT_IN2OUT_ERROR_NO_TRANSLATION]; next0= SNAT_IN2OUT_NEXT_DROP; @@ -3765,6 +4153,7 @@ VLIB_REGISTER_NODE (snat_in2out_fast_node) = { [SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup", [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-slowpath", [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error", + [SNAT_IN2OUT_NEXT_REASS] = "nat44-in2out-reass", }, };