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authorFilip Varga <fivarga@cisco.com>2020-12-10 15:55:25 +0100
committerOle Tr�an <otroan@employees.org>2021-01-05 14:09:39 +0000
commita210798c407035f09c10c018ebdaf12312161730 (patch)
treec03e68701aaca9c3a4207107bdacb183da8a4a5a /src/plugins/nat/nat44-ei/nat44_ei.c
parent641c6be821c3136cb140b6726e16246f2f1cbd4c (diff)
nat: refactor and split fo EI/ED features
This patch is aimed at moving EI features out of NAT44 plugin & split of EI/ED functions. Type: refactor Change-Id: I63cf70a264ed2512708fe92665d64f04690783d0 Signed-off-by: Filip Varga <fivarga@cisco.com>
Diffstat (limited to 'src/plugins/nat/nat44-ei/nat44_ei.c')
-rw-r--r--src/plugins/nat/nat44-ei/nat44_ei.c534
1 files changed, 534 insertions, 0 deletions
diff --git a/src/plugins/nat/nat44-ei/nat44_ei.c b/src/plugins/nat/nat44-ei/nat44_ei.c
new file mode 100644
index 00000000000..f50ccb9ba1b
--- /dev/null
+++ b/src/plugins/nat/nat44-ei/nat44_ei.c
@@ -0,0 +1,534 @@
+/*
+ * nat44_ei.c - nat44 endpoint dependent plugin
+ *
+ * Copyright (c) 2020 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 <vnet/vnet.h>
+#include <vnet/ip/ip.h>
+#include <vnet/ip/ip4.h>
+#include <vnet/plugin/plugin.h>
+#include <nat/nat.h>
+#include <nat/nat_dpo.h>
+#include <nat/lib/ipfix_logging.h>
+#include <nat/lib/nat_syslog.h>
+#include <nat/nat_inlines.h>
+#include <nat/nat44/inlines.h>
+#include <nat/nat_affinity.h>
+#include <vnet/fib/fib_table.h>
+#include <vnet/fib/ip4_fib.h>
+#include <vnet/ip/reass/ip4_sv_reass.h>
+#include <vppinfra/bihash_16_8.h>
+#include <nat/nat44/ed_inlines.h>
+#include <vnet/ip/ip_table.h>
+
+#include <nat/nat44-ei/nat44_ei_inlines.h>
+#include <nat/nat44-ei/nat44_ei.h>
+
+int
+nat44_ei_plugin_enable ()
+{
+ nat44_ei_set_alloc_default ();
+ nat_ha_enable ();
+ return 0;
+}
+
+void
+nat44_ei_plugin_disable ()
+{
+ nat_ha_disable ();
+}
+
+void
+nat44_ei_free_session_data (snat_main_t *sm, snat_session_t *s,
+ u32 thread_index, u8 is_ha)
+{
+ clib_bihash_kv_8_8_t kv;
+
+ snat_main_per_thread_data_t *tsm =
+ vec_elt_at_index (sm->per_thread_data, thread_index);
+
+ init_nat_i2o_k (&kv, s);
+ if (clib_bihash_add_del_8_8 (&tsm->in2out, &kv, 0))
+ nat_elog_warn ("in2out key del failed");
+
+ init_nat_o2i_k (&kv, s);
+ if (clib_bihash_add_del_8_8 (&tsm->out2in, &kv, 0))
+ nat_elog_warn ("out2in key del failed");
+
+ if (!is_ha)
+ {
+ nat_syslog_nat44_apmdel (s->user_index, s->in2out.fib_index,
+ &s->in2out.addr, s->in2out.port,
+ &s->out2in.addr, s->out2in.port, s->nat_proto);
+
+ nat_ipfix_logging_nat44_ses_delete (
+ thread_index, s->in2out.addr.as_u32, s->out2in.addr.as_u32,
+ s->nat_proto, s->in2out.port, s->out2in.port, s->in2out.fib_index);
+
+ nat_ha_sdel (&s->out2in.addr, s->out2in.port, &s->ext_host_addr,
+ s->ext_host_port, s->nat_proto, s->out2in.fib_index,
+ thread_index);
+ }
+
+ if (snat_is_session_static (s))
+ return;
+
+ snat_free_outside_address_and_port (sm->addresses, thread_index,
+ &s->out2in.addr, s->out2in.port,
+ s->nat_proto);
+}
+
+static_always_inline void
+nat44_ei_user_del_sessions (snat_user_t *u, u32 thread_index)
+{
+ dlist_elt_t *elt;
+ snat_session_t *s;
+
+ snat_main_t *sm = &snat_main;
+ snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
+
+ // get head
+ elt =
+ pool_elt_at_index (tsm->list_pool, u->sessions_per_user_list_head_index);
+ // get first element
+ elt = pool_elt_at_index (tsm->list_pool, elt->next);
+
+ while (elt->value != ~0)
+ {
+ s = pool_elt_at_index (tsm->sessions, elt->value);
+ elt = pool_elt_at_index (tsm->list_pool, elt->next);
+
+ nat44_ei_free_session_data (sm, s, thread_index, 0);
+ nat44_delete_session (sm, s, thread_index);
+ }
+}
+
+int
+nat44_ei_user_del (ip4_address_t *addr, u32 fib_index)
+{
+ int rv = 1;
+
+ snat_main_t *sm = &snat_main;
+ snat_main_per_thread_data_t *tsm;
+
+ snat_user_key_t user_key;
+ clib_bihash_kv_8_8_t kv, value;
+
+ if (sm->endpoint_dependent)
+ return rv;
+
+ user_key.addr.as_u32 = addr->as_u32;
+ user_key.fib_index = fib_index;
+ kv.key = user_key.as_u64;
+
+ if (sm->num_workers > 1)
+ {
+ vec_foreach (tsm, sm->per_thread_data)
+ {
+ if (!clib_bihash_search_8_8 (&tsm->user_hash, &kv, &value))
+ {
+ nat44_ei_user_del_sessions (
+ pool_elt_at_index (tsm->users, value.value),
+ tsm->thread_index);
+ rv = 0;
+ break;
+ }
+ }
+ }
+ else
+ {
+ tsm = vec_elt_at_index (sm->per_thread_data, sm->num_workers);
+ if (!clib_bihash_search_8_8 (&tsm->user_hash, &kv, &value))
+ {
+ nat44_ei_user_del_sessions (
+ pool_elt_at_index (tsm->users, value.value), tsm->thread_index);
+ rv = 0;
+ }
+ }
+ return rv;
+}
+
+void
+nat44_ei_static_mapping_del_sessions (snat_main_t *sm,
+ snat_main_per_thread_data_t *tsm,
+ snat_user_key_t u_key, int addr_only,
+ ip4_address_t e_addr, u16 e_port)
+{
+ clib_bihash_kv_8_8_t kv, value;
+ kv.key = u_key.as_u64;
+ u64 user_index;
+ dlist_elt_t *head, *elt;
+ snat_user_t *u;
+ snat_session_t *s;
+ u32 elt_index, head_index, ses_index;
+
+ if (!clib_bihash_search_8_8 (&tsm->user_hash, &kv, &value))
+ {
+ user_index = value.value;
+ u = pool_elt_at_index (tsm->users, user_index);
+ if (u->nstaticsessions)
+ {
+ head_index = u->sessions_per_user_list_head_index;
+ head = pool_elt_at_index (tsm->list_pool, head_index);
+ elt_index = head->next;
+ elt = pool_elt_at_index (tsm->list_pool, elt_index);
+ ses_index = elt->value;
+ while (ses_index != ~0)
+ {
+ s = pool_elt_at_index (tsm->sessions, ses_index);
+ elt = pool_elt_at_index (tsm->list_pool, elt->next);
+ ses_index = elt->value;
+
+ if (!addr_only)
+ {
+ if ((s->out2in.addr.as_u32 != e_addr.as_u32) ||
+ (s->out2in.port != e_port))
+ continue;
+ }
+
+ if (is_lb_session (s))
+ continue;
+
+ if (!snat_is_session_static (s))
+ continue;
+
+ nat_free_session_data (sm, s, tsm - sm->per_thread_data, 0);
+ nat44_delete_session (sm, s, tsm - sm->per_thread_data);
+
+ if (!addr_only)
+ break;
+ }
+ }
+ }
+}
+
+u32
+nat44_ei_get_in2out_worker_index (ip4_header_t *ip0, u32 rx_fib_index0,
+ u8 is_output)
+{
+ snat_main_t *sm = &snat_main;
+ u32 next_worker_index = 0;
+ u32 hash;
+
+ next_worker_index = sm->first_worker_index;
+ hash = ip0->src_address.as_u32 + (ip0->src_address.as_u32 >> 8) +
+ (ip0->src_address.as_u32 >> 16) + (ip0->src_address.as_u32 >> 24);
+
+ if (PREDICT_TRUE (is_pow2 (_vec_len (sm->workers))))
+ next_worker_index += sm->workers[hash & (_vec_len (sm->workers) - 1)];
+ else
+ next_worker_index += sm->workers[hash % _vec_len (sm->workers)];
+
+ return next_worker_index;
+}
+
+u32
+nat44_ei_get_out2in_worker_index (vlib_buffer_t *b, ip4_header_t *ip0,
+ u32 rx_fib_index0, u8 is_output)
+{
+ snat_main_t *sm = &snat_main;
+ udp_header_t *udp;
+ u16 port;
+ clib_bihash_kv_8_8_t kv, value;
+ snat_static_mapping_t *m;
+ u32 proto;
+ u32 next_worker_index = 0;
+
+ /* first try static mappings without port */
+ if (PREDICT_FALSE (pool_elts (sm->static_mappings)))
+ {
+ init_nat_k (&kv, ip0->dst_address, 0, rx_fib_index0, 0);
+ if (!clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv,
+ &value))
+ {
+ m = pool_elt_at_index (sm->static_mappings, value.value);
+ return m->workers[0];
+ }
+ }
+
+ proto = ip_proto_to_nat_proto (ip0->protocol);
+ udp = ip4_next_header (ip0);
+ port = udp->dst_port;
+
+ /* unknown protocol */
+ if (PREDICT_FALSE (proto == NAT_PROTOCOL_OTHER))
+ {
+ /* use current thread */
+ return vlib_get_thread_index ();
+ }
+
+ if (PREDICT_FALSE (ip0->protocol == IP_PROTOCOL_ICMP))
+ {
+ icmp46_header_t *icmp = (icmp46_header_t *) udp;
+ icmp_echo_header_t *echo = (icmp_echo_header_t *) (icmp + 1);
+ if (!icmp_type_is_error_message (
+ vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags))
+ port = vnet_buffer (b)->ip.reass.l4_src_port;
+ else
+ {
+ /* if error message, then it's not fragmented and we can access it */
+ ip4_header_t *inner_ip = (ip4_header_t *) (echo + 1);
+ proto = ip_proto_to_nat_proto (inner_ip->protocol);
+ void *l4_header = ip4_next_header (inner_ip);
+ switch (proto)
+ {
+ case NAT_PROTOCOL_ICMP:
+ icmp = (icmp46_header_t *) l4_header;
+ echo = (icmp_echo_header_t *) (icmp + 1);
+ port = echo->identifier;
+ break;
+ case NAT_PROTOCOL_UDP:
+ case NAT_PROTOCOL_TCP:
+ port = ((tcp_udp_header_t *) l4_header)->src_port;
+ break;
+ default:
+ return vlib_get_thread_index ();
+ }
+ }
+ }
+
+ /* try static mappings with port */
+ if (PREDICT_FALSE (pool_elts (sm->static_mappings)))
+ {
+ init_nat_k (&kv, ip0->dst_address, port, rx_fib_index0, proto);
+ if (!clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv,
+ &value))
+ {
+ m = pool_elt_at_index (sm->static_mappings, value.value);
+ return m->workers[0];
+ }
+ }
+
+ /* worker by outside port */
+ next_worker_index = sm->first_worker_index;
+ next_worker_index +=
+ sm->workers[(clib_net_to_host_u16 (port) - 1024) / sm->port_per_thread];
+ return next_worker_index;
+}
+
+static int
+nat44_ei_alloc_default_cb (snat_address_t *addresses, u32 fib_index,
+ u32 thread_index, nat_protocol_t proto,
+ ip4_address_t *addr, u16 *port, u16 port_per_thread,
+ u32 snat_thread_index)
+{
+ int i;
+ snat_address_t *a, *ga = 0;
+ u32 portnum;
+
+ for (i = 0; i < vec_len (addresses); i++)
+ {
+ a = addresses + i;
+ switch (proto)
+ {
+#define _(N, j, n, s) \
+ case NAT_PROTOCOL_##N: \
+ if (a->busy_##n##_ports_per_thread[thread_index] < port_per_thread) \
+ { \
+ if (a->fib_index == fib_index) \
+ { \
+ while (1) \
+ { \
+ portnum = (port_per_thread * snat_thread_index) + \
+ snat_random_port (0, port_per_thread - 1) + 1024; \
+ if (a->busy_##n##_port_refcounts[portnum]) \
+ continue; \
+ --a->busy_##n##_port_refcounts[portnum]; \
+ a->busy_##n##_ports_per_thread[thread_index]++; \
+ a->busy_##n##_ports++; \
+ *addr = a->addr; \
+ *port = clib_host_to_net_u16 (portnum); \
+ return 0; \
+ } \
+ } \
+ else if (a->fib_index == ~0) \
+ { \
+ ga = a; \
+ } \
+ } \
+ break;
+ foreach_nat_protocol
+#undef _
+ default : nat_elog_info ("unknown protocol");
+ return 1;
+ }
+ }
+
+ if (ga)
+ {
+ a = ga;
+ switch (proto)
+ {
+#define _(N, j, n, s) \
+ case NAT_PROTOCOL_##N: \
+ while (1) \
+ { \
+ portnum = (port_per_thread * snat_thread_index) + \
+ snat_random_port (0, port_per_thread - 1) + 1024; \
+ if (a->busy_##n##_port_refcounts[portnum]) \
+ continue; \
+ ++a->busy_##n##_port_refcounts[portnum]; \
+ a->busy_##n##_ports_per_thread[thread_index]++; \
+ a->busy_##n##_ports++; \
+ *addr = a->addr; \
+ *port = clib_host_to_net_u16 (portnum); \
+ return 0; \
+ }
+ break;
+ foreach_nat_protocol
+#undef _
+ default : nat_elog_info ("unknown protocol");
+ return 1;
+ }
+ }
+
+ /* Totally out of translations to use... */
+ nat_ipfix_logging_addresses_exhausted (thread_index, 0);
+ return 1;
+}
+
+static int
+nat44_ei_alloc_range_cb (snat_address_t *addresses, u32 fib_index,
+ u32 thread_index, nat_protocol_t proto,
+ ip4_address_t *addr, u16 *port, u16 port_per_thread,
+ u32 snat_thread_index)
+{
+ snat_main_t *sm = &snat_main;
+ snat_address_t *a = addresses;
+ u16 portnum, ports;
+
+ ports = sm->end_port - sm->start_port + 1;
+
+ if (!vec_len (addresses))
+ goto exhausted;
+
+ switch (proto)
+ {
+#define _(N, i, n, s) \
+ case NAT_PROTOCOL_##N: \
+ if (a->busy_##n##_ports < ports) \
+ { \
+ while (1) \
+ { \
+ portnum = snat_random_port (sm->start_port, sm->end_port); \
+ if (a->busy_##n##_port_refcounts[portnum]) \
+ continue; \
+ ++a->busy_##n##_port_refcounts[portnum]; \
+ a->busy_##n##_ports++; \
+ *addr = a->addr; \
+ *port = clib_host_to_net_u16 (portnum); \
+ return 0; \
+ } \
+ } \
+ break;
+ foreach_nat_protocol
+#undef _
+ default : nat_elog_info ("unknown protocol");
+ return 1;
+ }
+
+exhausted:
+ /* Totally out of translations to use... */
+ nat_ipfix_logging_addresses_exhausted (thread_index, 0);
+ return 1;
+}
+
+static int
+nat44_ei_alloc_mape_cb (snat_address_t *addresses, u32 fib_index,
+ u32 thread_index, nat_protocol_t proto,
+ ip4_address_t *addr, u16 *port, u16 port_per_thread,
+ u32 snat_thread_index)
+{
+ snat_main_t *sm = &snat_main;
+ snat_address_t *a = addresses;
+ u16 m, ports, portnum, A, j;
+ m = 16 - (sm->psid_offset + sm->psid_length);
+ ports = (1 << (16 - sm->psid_length)) - (1 << m);
+
+ if (!vec_len (addresses))
+ goto exhausted;
+
+ switch (proto)
+ {
+#define _(N, i, n, s) \
+ case NAT_PROTOCOL_##N: \
+ if (a->busy_##n##_ports < ports) \
+ { \
+ while (1) \
+ { \
+ A = snat_random_port (1, pow2_mask (sm->psid_offset)); \
+ j = snat_random_port (0, pow2_mask (m)); \
+ portnum = A | (sm->psid << sm->psid_offset) | (j << (16 - m)); \
+ if (a->busy_##n##_port_refcounts[portnum]) \
+ continue; \
+ ++a->busy_##n##_port_refcounts[portnum]; \
+ a->busy_##n##_ports++; \
+ *addr = a->addr; \
+ *port = clib_host_to_net_u16 (portnum); \
+ return 0; \
+ } \
+ } \
+ break;
+ foreach_nat_protocol
+#undef _
+ default : nat_elog_info ("unknown protocol");
+ return 1;
+ }
+
+exhausted:
+ /* Totally out of translations to use... */
+ nat_ipfix_logging_addresses_exhausted (thread_index, 0);
+ return 1;
+}
+
+void
+nat44_ei_set_alloc_default ()
+{
+ snat_main_t *sm = &snat_main;
+
+ sm->addr_and_port_alloc_alg = NAT_ADDR_AND_PORT_ALLOC_ALG_DEFAULT;
+ sm->alloc_addr_and_port = nat44_ei_alloc_default_cb;
+}
+
+void
+nat44_ei_set_alloc_range (u16 start_port, u16 end_port)
+{
+ snat_main_t *sm = &snat_main;
+
+ sm->addr_and_port_alloc_alg = NAT_ADDR_AND_PORT_ALLOC_ALG_RANGE;
+ sm->alloc_addr_and_port = nat44_ei_alloc_range_cb;
+ sm->start_port = start_port;
+ sm->end_port = end_port;
+}
+
+void
+nat44_ei_set_alloc_mape (u16 psid, u16 psid_offset, u16 psid_length)
+{
+ snat_main_t *sm = &snat_main;
+
+ sm->addr_and_port_alloc_alg = NAT_ADDR_AND_PORT_ALLOC_ALG_MAPE;
+ sm->alloc_addr_and_port = nat44_ei_alloc_mape_cb;
+ sm->psid = psid;
+ sm->psid_offset = psid_offset;
+ sm->psid_length = psid_length;
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */