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Diffstat (limited to 'src/plugins/nat/nat_inlines.h')
| -rw-r--r-- | src/plugins/nat/nat_inlines.h | 250 |
1 files changed, 250 insertions, 0 deletions
diff --git a/src/plugins/nat/nat_inlines.h b/src/plugins/nat/nat_inlines.h new file mode 100644 index 00000000000..db5b295f938 --- /dev/null +++ b/src/plugins/nat/nat_inlines.h @@ -0,0 +1,250 @@ +/* + * 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_nat_inlines_h__ +#define __included_nat_inlines_h__ + +#include <nat/nat.h> + +always_inline u32 +ip_proto_to_snat_proto (u8 ip_proto) +{ + u32 snat_proto = ~0; + + snat_proto = (ip_proto == IP_PROTOCOL_UDP) ? SNAT_PROTOCOL_UDP : snat_proto; + snat_proto = (ip_proto == IP_PROTOCOL_TCP) ? SNAT_PROTOCOL_TCP : snat_proto; + snat_proto = + (ip_proto == IP_PROTOCOL_ICMP) ? SNAT_PROTOCOL_ICMP : snat_proto; + snat_proto = + (ip_proto == IP_PROTOCOL_ICMP6) ? SNAT_PROTOCOL_ICMP : snat_proto; + + return snat_proto; +} + +always_inline u8 +snat_proto_to_ip_proto (snat_protocol_t snat_proto) +{ + u8 ip_proto = ~0; + + ip_proto = (snat_proto == SNAT_PROTOCOL_UDP) ? IP_PROTOCOL_UDP : ip_proto; + ip_proto = (snat_proto == SNAT_PROTOCOL_TCP) ? IP_PROTOCOL_TCP : ip_proto; + ip_proto = (snat_proto == SNAT_PROTOCOL_ICMP) ? IP_PROTOCOL_ICMP : ip_proto; + + return ip_proto; +} + +static_always_inline u8 +icmp_is_error_message (icmp46_header_t * icmp) +{ + switch (icmp->type) + { + case ICMP4_destination_unreachable: + case ICMP4_time_exceeded: + case ICMP4_parameter_problem: + case ICMP4_source_quench: + case ICMP4_redirect: + case ICMP4_alternate_host_address: + return 1; + } + return 0; +} + +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 u8 +maximum_sessions_exceeded (snat_main_t * sm, u32 thread_index) +{ + if (pool_elts (sm->per_thread_data[thread_index].sessions) >= + sm->max_translations) + return 1; + + return 0; +} + +always_inline void +nat_send_all_to_node (vlib_main_t * vm, u32 * bi_vector, + vlib_node_runtime_t * node, vlib_error_t * error, + u32 next) +{ + u32 n_left_from, *from, next_index, *to_next, n_left_to_next; + + from = bi_vector; + n_left_from = vec_len (bi_vector); + next_index = node->cached_next_index; + while (n_left_from > 0) + { + 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 = to_next[0] = from[0]; + from += 1; + n_left_from -= 1; + to_next += 1; + n_left_to_next -= 1; + vlib_buffer_t *p0 = vlib_get_buffer (vm, bi0); + p0->error = *error; + vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, + n_left_to_next, bi0, next); + } + vlib_put_next_frame (vm, node, next_index, n_left_to_next); + } +} + +always_inline void +user_session_increment (snat_main_t * sm, snat_user_t * u, u8 is_static) +{ + if (u->nsessions + u->nstaticsessions < sm->max_translations_per_user) + { + if (is_static) + u->nstaticsessions++; + else + u->nsessions++; + } +} + +always_inline void +nat44_delete_session (snat_main_t * sm, snat_session_t * ses, + u32 thread_index) +{ + snat_main_per_thread_data_t *tsm = vec_elt_at_index (sm->per_thread_data, + thread_index); + clib_bihash_kv_8_8_t kv, value; + snat_user_key_t u_key; + snat_user_t *u; + + nat_log_debug ("session deleted %U", format_snat_session, tsm, ses); + u_key.addr = ses->in2out.addr; + u_key.fib_index = ses->in2out.fib_index; + kv.key = u_key.as_u64; + if (!clib_bihash_search_8_8 (&tsm->user_hash, &kv, &value)) + { + u = pool_elt_at_index (tsm->users, value.value); + if (snat_is_session_static (ses)) + u->nstaticsessions--; + else + u->nsessions--; + } + clib_dlist_remove (tsm->list_pool, ses->per_user_index); + pool_put_index (tsm->list_pool, ses->per_user_index); + pool_put (tsm->sessions, ses); +} + +/** \brief Set TCP session state. + @return 1 if session was closed, otherwise 0 +*/ +always_inline int +nat44_set_tcp_session_state_i2o (snat_main_t * sm, snat_session_t * ses, + tcp_header_t * tcp, u32 thread_index) +{ + 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)) + { + nat_log_debug ("TCP close connection %U", format_snat_session, + &sm->per_thread_data[thread_index], ses); + nat_free_session_data (sm, ses, thread_index); + nat44_delete_session (sm, ses, thread_index); + return 1; + } + return 0; +} + +always_inline int +nat44_set_tcp_session_state_o2i (snat_main_t * sm, snat_session_t * ses, + tcp_header_t * tcp, u32 thread_index) +{ + 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)) + { + nat_log_debug ("TCP close connection %U", format_snat_session, + &sm->per_thread_data[thread_index], ses); + nat_free_session_data (sm, ses, thread_index); + nat44_delete_session (sm, ses, thread_index); + return 1; + } + return 0; +} + +always_inline void +nat44_session_update_counters (snat_session_t * s, f64 now, uword bytes) +{ + 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) +{ + clib_dlist_remove (sm->per_thread_data[thread_index].list_pool, + s->per_user_index); + clib_dlist_addtail (sm->per_thread_data[thread_index].list_pool, + s->per_user_list_head_index, s->per_user_index); +} + +#endif /* __included_nat_inlines_h__ */ + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |