/* * Copyright (c) 2018 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. */ /** * @brief The NAT inline functions */ #ifndef __included_nat44_ed_inlines_h__ #define __included_nat44_ed_inlines_h__ #include <float.h> #include <vppinfra/clib.h> #include <vnet/fib/ip4_fib.h> #include <nat/lib/log.h> #include <nat/nat44-ed/nat44_ed.h> always_inline u64 calc_nat_key (ip4_address_t addr, u16 port, u32 fib_index, u8 proto) { ASSERT (fib_index <= (1 << 14) - 1); ASSERT (proto <= (1 << 3) - 1); return (u64) addr.as_u32 << 32 | (u64) port << 16 | fib_index << 3 | (proto & 0x7); } always_inline void split_nat_key (u64 key, ip4_address_t *addr, u16 *port, u32 *fib_index, nat_protocol_t *proto) { if (addr) { addr->as_u32 = key >> 32; } if (port) { *port = (key >> 16) & (u16) ~0; } if (fib_index) { *fib_index = key >> 3 & ((1 << 13) - 1); } if (proto) { *proto = key & 0x7; } } always_inline void init_nat_k (clib_bihash_kv_8_8_t *kv, ip4_address_t addr, u16 port, u32 fib_index, nat_protocol_t proto) { kv->key = calc_nat_key (addr, port, fib_index, proto); kv->value = ~0ULL; } always_inline void init_nat_kv (clib_bihash_kv_8_8_t *kv, ip4_address_t addr, u16 port, u32 fib_index, nat_protocol_t proto, u32 thread_index, u32 session_index) { init_nat_k (kv, addr, port, fib_index, proto); kv->value = (u64) thread_index << 32 | session_index; } always_inline void init_nat_i2o_k (clib_bihash_kv_8_8_t *kv, snat_session_t *s) { return init_nat_k (kv, s->in2out.addr, s->in2out.port, s->in2out.fib_index, s->nat_proto); } always_inline void init_nat_i2o_kv (clib_bihash_kv_8_8_t *kv, snat_session_t *s, u32 thread_index, u32 session_index) { init_nat_k (kv, s->in2out.addr, s->in2out.port, s->in2out.fib_index, s->nat_proto); kv->value = (u64) thread_index << 32 | session_index; } always_inline void init_nat_o2i_k (clib_bihash_kv_8_8_t *kv, snat_session_t *s) { return init_nat_k (kv, s->out2in.addr, s->out2in.port, s->out2in.fib_index, s->nat_proto); } always_inline void init_nat_o2i_kv (clib_bihash_kv_8_8_t *kv, snat_session_t *s, u32 thread_index, u32 session_index) { init_nat_k (kv, s->out2in.addr, s->out2in.port, s->out2in.fib_index, s->nat_proto); kv->value = (u64) thread_index << 32 | session_index; } always_inline u32 nat_value_get_thread_index (clib_bihash_kv_8_8_t *value) { return value->value >> 32; } always_inline u32 nat_value_get_session_index (clib_bihash_kv_8_8_t *value) { return value->value & ~(u32) 0; } always_inline void init_ed_k (clib_bihash_kv_16_8_t *kv, ip4_address_t l_addr, u16 l_port, ip4_address_t r_addr, u16 r_port, u32 fib_index, u8 proto) { kv->key[0] = (u64) r_addr.as_u32 << 32 | l_addr.as_u32; kv->key[1] = (u64) r_port << 48 | (u64) l_port << 32 | fib_index << 8 | proto; } always_inline void init_ed_kv (clib_bihash_kv_16_8_t *kv, ip4_address_t l_addr, u16 l_port, ip4_address_t r_addr, u16 r_port, u32 fib_index, u8 proto, u32 thread_index, u32 session_index) { init_ed_k (kv, l_addr, l_port, r_addr, r_port, fib_index, proto); kv->value = (u64) thread_index << 32 | session_index; } always_inline u32 ed_value_get_thread_index (clib_bihash_kv_16_8_t *value) { return value->value >> 32; } always_inline u32 ed_value_get_session_index (clib_bihash_kv_16_8_t *value) { return value->value & ~(u32) 0; } always_inline void split_ed_kv (clib_bihash_kv_16_8_t *kv, ip4_address_t *l_addr, ip4_address_t *r_addr, u8 *proto, u32 *fib_index, u16 *l_port, u16 *r_port) { if (l_addr) { l_addr->as_u32 = kv->key[0] & (u32) ~0; } if (r_addr) { r_addr->as_u32 = kv->key[0] >> 32; } if (r_port) { *r_port = kv->key[1] >> 48; } if (l_port) { *l_port = (kv->key[1] >> 32) & (u16) ~0; } if (fib_index) { *fib_index = (kv->key[1] >> 8) & ((1 << 24) - 1); } if (proto) { *proto = kv->key[1] & (u8) ~0; } } static_always_inline int nat_get_icmp_session_lookup_values (vlib_buffer_t *b, ip4_header_t *ip0, ip4_address_t *lookup_saddr, u16 *lookup_sport, ip4_address_t *lookup_daddr, u16 *lookup_dport, u8 *lookup_protocol) { icmp46_header_t *icmp0; 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); // avoid warning about unused variables in caller by setting to bogus values *lookup_sport = 0; *lookup_dport = 0; if (!icmp_type_is_error_message ( vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags)) { *lookup_protocol = IP_PROTOCOL_ICMP; lookup_saddr->as_u32 = ip0->src_address.as_u32; *lookup_sport = vnet_buffer (b)->ip.reass.l4_src_port; lookup_daddr->as_u32 = ip0->dst_address.as_u32; *lookup_dport = vnet_buffer (b)->ip.reass.l4_dst_port; } else { inner_ip0 = (ip4_header_t *) (echo0 + 1); l4_header = ip4_next_header (inner_ip0); *lookup_protocol = inner_ip0->protocol; lookup_saddr->as_u32 = inner_ip0->dst_address.as_u32; lookup_daddr->as_u32 = inner_ip0->src_address.as_u32; switch (ip_proto_to_nat_proto (inner_ip0->protocol)) { case NAT_PROTOCOL_ICMP: inner_icmp0 = (icmp46_header_t *) l4_header; inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1); *lookup_sport = inner_echo0->identifier; *lookup_dport = inner_echo0->identifier; break; case NAT_PROTOCOL_UDP: case NAT_PROTOCOL_TCP: *lookup_sport = ((tcp_udp_header_t *) l4_header)->dst_port; *lookup_dport = ((tcp_udp_header_t *) l4_header)->src_port; break; default: return NAT_IN2OUT_ED_ERROR_UNSUPPORTED_PROTOCOL; } } return 0; } always_inline u32 nat44_session_get_timeout (snat_main_t *sm, snat_session_t *s) { switch (s->nat_proto) { case NAT_PROTOCOL_ICMP: return sm->timeouts.icmp; case NAT_PROTOCOL_UDP: return sm->timeouts.udp; case NAT_PROTOCOL_TCP: { if (s->state) return sm->timeouts.tcp.transitory; else return sm->timeouts.tcp.established; } default: return sm->timeouts.udp; } return 0; } static_always_inline u8 nat44_ed_maximum_sessions_exceeded (snat_main_t *sm, u32 fib_index, u32 thread_index) { u32 translations; translations = pool_elts (sm->per_thread_data[thread_index].sessions); if (vec_len (sm->max_translations_per_fib) <= fib_index) fib_index = 0; return translations >= sm->max_translations_per_fib[fib_index]; } static_always_inline int nat_ed_lru_insert (snat_main_per_thread_data_t *tsm, snat_session_t *s, f64 now, u8 proto) { dlist_elt_t *lru_list_elt; pool_get (tsm->lru_pool, lru_list_elt); s->lru_index = lru_list_elt - tsm->lru_pool; switch (proto) { case IP_PROTOCOL_UDP: s->lru_head_index = tsm->udp_lru_head_index; break; case IP_PROTOCOL_TCP: s->lru_head_index = tsm->tcp_trans_lru_head_index; break; case IP_PROTOCOL_ICMP: s->lru_head_index = tsm->icmp_lru_head_index; break; default: s->lru_head_index = tsm->unk_proto_lru_head_index; break; } clib_dlist_addtail (tsm->lru_pool, s->lru_head_index, s->lru_index); lru_list_elt->value = s - tsm->sessions; s->last_lru_update = now; return 1; } static_always_inline void nat_6t_flow_to_ed_k (clib_bihash_kv_16_8_t *kv, nat_6t_flow_t *f) { init_ed_k (kv, f->match.saddr, f->match.sport, f->match.daddr, f->match.dport, f->match.fib_index, f->match.proto); } static_always_inline void nat_6t_flow_to_ed_kv (clib_bihash_kv_16_8_t *kv, nat_6t_flow_t *f, u32 thread_idx, u32 session_idx) { init_ed_kv (kv, f->match.saddr, f->match.sport, f->match.daddr, f->match.dport, f->match.fib_index, f->match.proto, thread_idx, session_idx); } static_always_inline int nat_ed_ses_i2o_flow_hash_add_del (snat_main_t *sm, u32 thread_idx, snat_session_t *s, int is_add) { snat_main_per_thread_data_t *tsm = vec_elt_at_index (sm->per_thread_data, thread_idx); clib_bihash_kv_16_8_t kv; if (0 == is_add) { nat_6t_flow_to_ed_k (&kv, &s->i2o); } else { nat_6t_flow_to_ed_kv (&kv, &s->i2o, thread_idx, s - tsm->sessions); nat_6t_l3_l4_csum_calc (&s->i2o); } return clib_bihash_add_del_16_8 (&sm->flow_hash, &kv, is_add); } static_always_inline int nat_ed_ses_o2i_flow_hash_add_del (snat_main_t *sm, u32 thread_idx, snat_session_t *s, int is_add) { snat_main_per_thread_data_t *tsm = vec_elt_at_index (sm->per_thread_data, thread_idx); clib_bihash_kv_16_8_t kv; if (0 == is_add) { nat_6t_flow_to_ed_k (&kv, &s->o2i); } else { nat_6t_flow_to_ed_kv (&kv, &s->o2i, thread_idx, s - tsm->sessions); nat_6t_l3_l4_csum_calc (&s->o2i); } return clib_bihash_add_del_16_8 (&sm->flow_hash, &kv, is_add); } always_inline void nat_ed_session_delete (snat_main_t *sm, snat_session_t *ses, u32 thread_index, int lru_delete /* delete from global LRU list */) { snat_main_per_thread_data_t *tsm = vec_elt_at_index (sm->per_thread_data, thread_index); if (lru_delete) { clib_dlist_remove (tsm->lru_pool, ses->lru_index); } pool_put_index (tsm->lru_pool, ses->lru_index); if (nat_ed_ses_i2o_flow_hash_add_del (sm, thread_index, ses, 0)) nat_elog_warn (sm, "flow hash del failed"); if (nat_ed_ses_o2i_flow_hash_add_del (sm, thread_index, ses, 0)) nat_elog_warn (sm, "flow hash del failed"); pool_put (tsm->sessions, ses); vlib_set_simple_counter (&sm->total_sessions, thread_index, 0, pool_elts (tsm->sessions)); } static_always_inline int nat_lru_free_one_with_head (snat_main_t *sm, int thread_index, f64 now, u32 head_index) { snat_session_t *s = NULL; dlist_elt_t *oldest_elt; f64 sess_timeout_time; u32 oldest_index; snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index]; oldest_index = clib_dlist_remove_head (tsm->lru_pool, head_index); if (~0 != oldest_index) { oldest_elt = pool_elt_at_index (tsm->lru_pool, oldest_index); s = pool_elt_at_index (tsm->sessions, oldest_elt->value); sess_timeout_time = s->last_heard + (f64) nat44_session_get_timeout (sm, s); if (now >= sess_timeout_time || (s->tcp_closed_timestamp && now >= s->tcp_closed_timestamp)) { nat_free_session_data (sm, s, thread_index, 0); nat_ed_session_delete (sm, s, thread_index, 0); return 1; } else { clib_dlist_addhead (tsm->lru_pool, head_index, oldest_index); } } return 0; } static_always_inline int nat_lru_free_one (snat_main_t *sm, int thread_index, f64 now) { snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index]; int rc = 0; #define _(p) \ if ((rc = nat_lru_free_one_with_head (sm, thread_index, now, \ tsm->p##_lru_head_index))) \ { \ return rc; \ } _ (tcp_trans); _ (udp); _ (unk_proto); _ (icmp); _ (tcp_estab); #undef _ return 0; } static_always_inline snat_session_t * nat_ed_session_alloc (snat_main_t *sm, u32 thread_index, f64 now, u8 proto) { snat_session_t *s; snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index]; nat_lru_free_one (sm, thread_index, now); pool_get (tsm->sessions, s); clib_memset (s, 0, sizeof (*s)); nat_ed_lru_insert (tsm, s, now, proto); s->ha_last_refreshed = now; vlib_set_simple_counter (&sm->total_sessions, thread_index, 0, pool_elts (tsm->sessions)); return s; } // slow path static_always_inline void per_vrf_sessions_cleanup (u32 thread_index) { snat_main_t *sm = &snat_main; snat_main_per_thread_data_t *tsm = vec_elt_at_index (sm->per_thread_data, thread_index); per_vrf_sessions_t *per_vrf_sessions; u32 *to_free = 0, *i; vec_foreach (per_vrf_sessions, tsm->per_vrf_sessions_vec) { if (per_vrf_sessions->expired) { if (per_vrf_sessions->ses_count == 0) { vec_add1 (to_free, per_vrf_sessions - tsm->per_vrf_sessions_vec); } } } if (vec_len (to_free)) { vec_foreach (i, to_free) { vec_del1 (tsm->per_vrf_sessions_vec, *i); } } vec_free (to_free); } // slow path static_always_inline void per_vrf_sessions_register_session (snat_session_t *s, u32 thread_index) { snat_main_t *sm = &snat_main; snat_main_per_thread_data_t *tsm = vec_elt_at_index (sm->per_thread_data, thread_index); per_vrf_sessions_t *per_vrf_sessions; per_vrf_sessions_cleanup (thread_index); // s->per_vrf_sessions_index == ~0 ... reuse of old session vec_foreach (per_vrf_sessions, tsm->per_vrf_sessions_vec) { // ignore already expired registrations if (per_vrf_sessions->expired) continue; if ((s->in2out.fib_index == per_vrf_sessions->rx_fib_index) && (s->out2in.fib_index == per_vrf_sessions->tx_fib_index)) { goto done; } if ((s->in2out.fib_index == per_vrf_sessions->tx_fib_index) && (s->out2in.fib_index == per_vrf_sessions->rx_fib_index)) { goto done; } } // create a new registration vec_add2 (tsm->per_vrf_sessions_vec, per_vrf_sessions, 1); clib_memset (per_vrf_sessions, 0, sizeof (*per_vrf_sessions)); per_vrf_sessions->rx_fib_index = s->in2out.fib_index; per_vrf_sessions->tx_fib_index = s->out2in.fib_index; done: s->per_vrf_sessions_index = per_vrf_sessions - tsm->per_vrf_sessions_vec; per_vrf_sessions->ses_count++; } // fast path static_always_inline void per_vrf_sessions_unregister_session (snat_session_t *s, u32 thread_index) { snat_main_t *sm = &snat_main; snat_main_per_thread_data_t *tsm; per_vrf_sessions_t *per_vrf_sessions; ASSERT (s->per_vrf_sessions_index != ~0); tsm = vec_elt_at_index (sm->per_thread_data, thread_index); per_vrf_sessions = vec_elt_at_index (tsm->per_vrf_sessions_vec, s->per_vrf_sessions_index); ASSERT (per_vrf_sessions->ses_count != 0); per_vrf_sessions->ses_count--; s->per_vrf_sessions_index = ~0; } // fast path static_always_inline u8 per_vrf_sessions_is_expired (snat_session_t *s, u32 thread_index) { snat_main_t *sm = &snat_main; snat_main_per_thread_data_t *tsm; per_vrf_sessions_t *per_vrf_sessions; ASSERT (s->per_vrf_sessions_index != ~0); tsm = vec_elt_at_index (sm->per_thread_data, thread_index); per_vrf_sessions = vec_elt_at_index (tsm->per_vrf_sessions_vec, s->per_vrf_sessions_index); return per_vrf_sessions->expired; } static_always_inline void nat_6t_flow_init (nat_6t_flow_t *f, u32 thread_idx, ip4_address_t saddr, u16 sport, ip4_address_t daddr, u16 dport, u32 fib_index, u8 proto, u32 session_idx) { clib_memset (f, 0, sizeof (*f)); f->match.saddr = saddr; f->match.sport = sport; f->match.daddr = daddr; f->match.dport = dport; f->match.proto = proto; f->match.fib_index = fib_index; } static_always_inline void nat_6t_i2o_flow_init (snat_main_t *sm, u32 thread_idx, snat_session_t *s, ip4_address_t saddr, u16 sport, ip4_address_t daddr, u16 dport, u32 fib_index, u8 proto) { snat_main_per_thread_data_t *tsm = vec_elt_at_index (sm->per_thread_data, thread_idx); nat_6t_flow_init (&s->i2o, thread_idx, saddr, sport, daddr, dport, fib_index, proto, s - tsm->sessions); } static_always_inline void nat_6t_o2i_flow_init (snat_main_t *sm, u32 thread_idx, snat_session_t *s, ip4_address_t saddr, u16 sport, ip4_address_t daddr, u16 dport, u32 fib_index, u8 proto) { snat_main_per_thread_data_t *tsm = vec_elt_at_index (sm->per_thread_data, thread_idx); nat_6t_flow_init (&s->o2i, thread_idx, saddr, sport, daddr, dport, fib_index, proto, s - tsm->sessions); } static_always_inline int nat_6t_t_eq (nat_6t_t *t1, nat_6t_t *t2) { return t1->as_u64[0] == t2->as_u64[0] && t1->as_u64[1] == t2->as_u64[1]; } static inline uword nat_pre_node_fn_inline (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame, u32 def_next) { u32 n_left_from, *from; from = vlib_frame_vector_args (frame); n_left_from = frame->n_vectors; vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs; u16 nexts[VLIB_FRAME_SIZE], *next = nexts; vlib_get_buffers (vm, from, b, n_left_from); while (n_left_from >= 2) { u32 next0, next1; u32 arc_next0, arc_next1; vlib_buffer_t *b0, *b1; b0 = *b; b++; b1 = *b; b++; /* Prefetch next iteration. */ if (PREDICT_TRUE (n_left_from >= 4)) { vlib_buffer_t *p2, *p3; p2 = *b; p3 = *(b + 1); vlib_prefetch_buffer_header (p2, LOAD); vlib_prefetch_buffer_header (p3, LOAD); CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, LOAD); CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, LOAD); } next0 = def_next; next1 = def_next; vnet_feature_next (&arc_next0, b0); vnet_feature_next (&arc_next1, b1); vnet_buffer2 (b0)->nat.arc_next = arc_next0; vnet_buffer2 (b1)->nat.arc_next = arc_next1; if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE))) { if (b0->flags & VLIB_BUFFER_IS_TRACED) { nat_pre_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); t->next_index = next0; t->arc_next_index = arc_next0; } if (b1->flags & VLIB_BUFFER_IS_TRACED) { nat_pre_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); t->next_index = next1; t->arc_next_index = arc_next1; } } n_left_from -= 2; next[0] = next0; next[1] = next1; next += 2; } while (n_left_from > 0) { u32 next0; u32 arc_next0; vlib_buffer_t *b0; b0 = *b; b++; next0 = def_next; vnet_feature_next (&arc_next0, b0); vnet_buffer2 (b0)->nat.arc_next = arc_next0; if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && (b0->flags & VLIB_BUFFER_IS_TRACED))) { nat_pre_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); t->next_index = next0; t->arc_next_index = arc_next0; } n_left_from--; next[0] = next0; next++; } vlib_buffer_enqueue_to_next (vm, node, from, (u16 *) nexts, frame->n_vectors); return frame->n_vectors; } static_always_inline u16 snat_random_port (u16 min, u16 max) { snat_main_t *sm = &snat_main; u32 rwide; u16 r; rwide = random_u32 (&sm->random_seed); r = rwide & 0xFFFF; if (r >= min && r <= max) return r; return min + (rwide % (max - min + 1)); } always_inline u8 is_interface_addr (snat_main_t *sm, vlib_node_runtime_t *node, u32 sw_if_index0, u32 ip4_addr) { snat_runtime_t *rt = (snat_runtime_t *) node->runtime_data; ip4_address_t *first_int_addr; if (PREDICT_FALSE (rt->cached_sw_if_index != sw_if_index0)) { first_int_addr = ip4_interface_first_address ( sm->ip4_main, sw_if_index0, 0 /* just want the address */); rt->cached_sw_if_index = sw_if_index0; if (first_int_addr) rt->cached_ip4_address = first_int_addr->as_u32; else rt->cached_ip4_address = 0; } if (PREDICT_FALSE (ip4_addr == rt->cached_ip4_address)) return 1; else return 0; } always_inline void nat44_set_tcp_session_state_i2o (snat_main_t *sm, f64 now, snat_session_t *ses, vlib_buffer_t *b, u32 thread_index) { snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index]; u8 tcp_flags = vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags; u32 tcp_ack_number = vnet_buffer (b)->ip.reass.tcp_ack_number; u32 tcp_seq_number = vnet_buffer (b)->ip.reass.tcp_seq_number; if ((ses->state == 0) && (tcp_flags & TCP_FLAG_RST)) ses->state = NAT44_SES_RST; if ((ses->state == NAT44_SES_RST) && !(tcp_flags & TCP_FLAG_RST)) ses->state = 0; if ((tcp_flags & TCP_FLAG_ACK) && (ses->state & NAT44_SES_I2O_SYN) && (ses->state & NAT44_SES_O2I_SYN)) ses->state = 0; if (tcp_flags & TCP_FLAG_SYN) ses->state |= NAT44_SES_I2O_SYN; if (tcp_flags & TCP_FLAG_FIN) { ses->i2o_fin_seq = clib_net_to_host_u32 (tcp_seq_number); ses->state |= NAT44_SES_I2O_FIN; } if ((tcp_flags & TCP_FLAG_ACK) && (ses->state & NAT44_SES_O2I_FIN)) { if (clib_net_to_host_u32 (tcp_ack_number) > ses->o2i_fin_seq) { ses->state |= NAT44_SES_O2I_FIN_ACK; if (nat44_is_ses_closed (ses)) { // if session is now closed, save the timestamp ses->tcp_closed_timestamp = now + sm->timeouts.tcp.transitory; ses->last_lru_update = now; } } } // move the session to proper LRU if (ses->state) { ses->lru_head_index = tsm->tcp_trans_lru_head_index; } else { ses->lru_head_index = tsm->tcp_estab_lru_head_index; } clib_dlist_remove (tsm->lru_pool, ses->lru_index); clib_dlist_addtail (tsm->lru_pool, ses->lru_head_index, ses->lru_index); } always_inline void nat44_set_tcp_session_state_o2i (snat_main_t *sm, f64 now, snat_session_t *ses, u8 tcp_flags, u32 tcp_ack_number, u32 tcp_seq_number, u32 thread_index) { snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index]; if ((ses->state == 0) && (tcp_flags & TCP_FLAG_RST)) ses->state = NAT44_SES_RST; if ((ses->state == NAT44_SES_RST) && !(tcp_flags & TCP_FLAG_RST)) ses->state = 0; if ((tcp_flags & TCP_FLAG_ACK) && (ses->state & NAT44_SES_I2O_SYN) && (ses->state & NAT44_SES_O2I_SYN)) ses->state = 0; if (tcp_flags & TCP_FLAG_SYN) ses->state |= NAT44_SES_O2I_SYN; if (tcp_flags & TCP_FLAG_FIN) { ses->o2i_fin_seq = clib_net_to_host_u32 (tcp_seq_number); ses->state |= NAT44_SES_O2I_FIN; } if ((tcp_flags & TCP_FLAG_ACK) && (ses->state & NAT44_SES_I2O_FIN)) { if (clib_net_to_host_u32 (tcp_ack_number) > ses->i2o_fin_seq) ses->state |= NAT44_SES_I2O_FIN_ACK; if (nat44_is_ses_closed (ses)) { // if session is now closed, save the timestamp ses->tcp_closed_timestamp = now + sm->timeouts.tcp.transitory; ses->last_lru_update = now; } } // move the session to proper LRU if (ses->state) { ses->lru_head_index = tsm->tcp_trans_lru_head_index; } else { ses->lru_head_index = tsm->tcp_estab_lru_head_index; } clib_dlist_remove (tsm->lru_pool, ses->lru_index); clib_dlist_addtail (tsm->lru_pool, ses->lru_head_index, ses->lru_index); } always_inline void nat44_session_update_counters (snat_session_t *s, f64 now, uword bytes, u32 thread_index) { s->last_heard = now; s->total_pkts++; s->total_bytes += bytes; } /** \brief Per-user LRU list maintenance */ always_inline void nat44_session_update_lru (snat_main_t *sm, snat_session_t *s, u32 thread_index) { /* don't update too often - timeout is in magnitude of seconds anyway */ if (s->last_heard > s->last_lru_update + 1) { clib_dlist_remove (sm->per_thread_data[thread_index].lru_pool, s->lru_index); clib_dlist_addtail (sm->per_thread_data[thread_index].lru_pool, s->lru_head_index, s->lru_index); s->last_lru_update = s->last_heard; } } #endif /* __included_nat44_ed_inlines_h__ */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */