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authorMatus Fabian <matfabia@cisco.com>2017-09-04 02:17:18 -0700
committerOle Trøan <otroan@employees.org>2017-09-06 08:49:25 +0000
commit704018cf117b6667f08b09d6db5fbec105bf6d57 (patch)
tree27a52337f4b5f35092a422290998f7c37b4071f7 /src/plugins/nat/nat.c
parent030ab4815f777d6a0fdbfbc457e0f55fc32df8d3 (diff)
NAT: Destination NAT44 with load-balancing (VPP-954)
added load-balancing static mappings with unequal load support Change-Id: Ie505e41f24d46f812b94dd28bdafe3dc170a6060 Signed-off-by: Matus Fabian <matfabia@cisco.com>
Diffstat (limited to 'src/plugins/nat/nat.c')
-rw-r--r--src/plugins/nat/nat.c430
1 files changed, 399 insertions, 31 deletions
diff --git a/src/plugins/nat/nat.c b/src/plugins/nat/nat.c
index f9ecb943a90..fabd0bc26ae 100644
--- a/src/plugins/nat/nat.c
+++ b/src/plugins/nat/nat.c
@@ -506,15 +506,16 @@ int snat_add_static_mapping(ip4_address_t l_addr, ip4_address_t e_addr,
if (snat_is_unk_proto_session (s))
{
clib_bihash_kv_16_8_t up_kv;
- snat_unk_proto_ses_key_t up_key;
+ nat_ed_ses_key_t up_key;
up_key.l_addr = s->in2out.addr;
up_key.r_addr = s->ext_host_addr;
up_key.fib_index = s->in2out.fib_index;
up_key.proto = s->in2out.port;
- up_key.rsvd[0] = up_key.rsvd[1] = up_key.rsvd[2] = 0;
+ up_key.rsvd = 0;
+ up_key.l_port = 0;
up_kv.key[0] = up_key.as_u64[0];
up_kv.key[1] = up_key.as_u64[1];
- if (clib_bihash_add_del_16_8 (&sm->in2out_unk_proto,
+ if (clib_bihash_add_del_16_8 (&sm->in2out_ed,
&up_kv, 0))
clib_warning ("in2out key del failed");
@@ -522,7 +523,7 @@ int snat_add_static_mapping(ip4_address_t l_addr, ip4_address_t e_addr,
up_key.fib_index = s->out2in.fib_index;
up_kv.key[0] = up_key.as_u64[0];
up_kv.key[1] = up_key.as_u64[1];
- if (clib_bihash_add_del_16_8 (&sm->out2in_unk_proto,
+ if (clib_bihash_add_del_16_8 (&sm->out2in_ed,
&up_kv, 0))
clib_warning ("out2in key del failed");
@@ -589,6 +590,243 @@ delete:
return 0;
}
+int nat44_add_del_lb_static_mapping (ip4_address_t e_addr, u16 e_port,
+ snat_protocol_t proto, u32 vrf_id,
+ nat44_lb_addr_port_t *locals, u8 is_add)
+{
+ snat_main_t * sm = &snat_main;
+ snat_static_mapping_t *m;
+ snat_session_key_t m_key;
+ clib_bihash_kv_8_8_t kv, value;
+ u32 fib_index;
+ snat_address_t *a = 0;
+ int i;
+ nat44_lb_addr_port_t *local;
+ snat_user_key_t w_key0;
+ snat_worker_key_t w_key1;
+ u32 worker_index = 0;
+
+ m_key.addr = e_addr;
+ m_key.port = e_port;
+ m_key.protocol = proto;
+ m_key.fib_index = sm->outside_fib_index;
+ kv.key = m_key.as_u64;
+ if (clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value))
+ m = 0;
+ else
+ m = pool_elt_at_index (sm->static_mappings, value.value);
+
+ if (is_add)
+ {
+ if (m)
+ return VNET_API_ERROR_VALUE_EXIST;
+
+ if (vec_len (locals) < 2)
+ return VNET_API_ERROR_INVALID_VALUE;
+
+ fib_index = fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4,
+ vrf_id);
+
+ /* Find external address in allocated addresses and reserve port for
+ address and port pair mapping when dynamic translations enabled */
+ if (!sm->static_mapping_only)
+ {
+ for (i = 0; i < vec_len (sm->addresses); i++)
+ {
+ if (sm->addresses[i].addr.as_u32 == e_addr.as_u32)
+ {
+ a = sm->addresses + i;
+ /* External port must be unused */
+ switch (proto)
+ {
+#define _(N, j, n, s) \
+ case SNAT_PROTOCOL_##N: \
+ if (clib_bitmap_get_no_check (a->busy_##n##_port_bitmap, e_port)) \
+ return VNET_API_ERROR_INVALID_VALUE; \
+ clib_bitmap_set_no_check (a->busy_##n##_port_bitmap, e_port, 1); \
+ if (e_port > 1024) \
+ a->busy_##n##_ports++; \
+ break;
+ foreach_snat_protocol
+#undef _
+ default:
+ clib_warning("unknown_protocol");
+ return VNET_API_ERROR_INVALID_VALUE_2;
+ }
+ break;
+ }
+ }
+ /* External address must be allocated */
+ if (!a)
+ return VNET_API_ERROR_NO_SUCH_ENTRY;
+ }
+
+ pool_get (sm->static_mappings, m);
+ memset (m, 0, sizeof (*m));
+ m->external_addr = e_addr;
+ m->addr_only = 0;
+ m->vrf_id = vrf_id;
+ m->fib_index = fib_index;
+ m->external_port = e_port;
+ m->proto = proto;
+
+ m_key.addr = m->external_addr;
+ m_key.port = m->external_port;
+ m_key.protocol = m->proto;
+ m_key.fib_index = sm->outside_fib_index;
+ kv.key = m_key.as_u64;
+ kv.value = m - sm->static_mappings;
+ if (clib_bihash_add_del_8_8(&sm->static_mapping_by_external, &kv, 1))
+ {
+ clib_warning ("static_mapping_by_external key add failed");
+ return VNET_API_ERROR_UNSPECIFIED;
+ }
+ m_key.port = clib_host_to_net_u16 (m->external_port);
+ kv.key = m_key.as_u64;
+ kv.value = ~0ULL;
+ if (clib_bihash_add_del_8_8(&sm->out2in, &kv, 1))
+ {
+ clib_warning ("static_mapping_by_local key add failed");
+ return VNET_API_ERROR_UNSPECIFIED;
+ }
+
+ m_key.fib_index = m->fib_index;
+
+ /* Assign worker */
+ if (sm->workers)
+ {
+ w_key0.addr = locals[0].addr;
+ w_key0.fib_index = fib_index;
+ kv.key = w_key0.as_u64;
+
+ if (clib_bihash_search_8_8 (&sm->worker_by_in, &kv, &value))
+ worker_index = sm->first_worker_index +
+ sm->workers[sm->next_worker++ % vec_len (sm->workers)];
+ else
+ worker_index = value.value;
+
+ w_key1.addr = m->external_addr;
+ w_key1.port = clib_host_to_net_u16 (m->external_port);
+ w_key1.fib_index = sm->outside_fib_index;
+ kv.key = w_key1.as_u64;
+ kv.value = worker_index;
+ if (clib_bihash_add_del_8_8 (&sm->worker_by_out, &kv, 1))
+ {
+ clib_warning ("worker-by-out add key failed");
+ return VNET_API_ERROR_UNSPECIFIED;
+ }
+ }
+
+ for (i = 0; i < vec_len (locals); i++)
+ {
+ m_key.addr = locals[i].addr;
+ m_key.port = locals[i].port;
+ kv.key = m_key.as_u64;
+ kv.value = m - sm->static_mappings;
+ clib_bihash_add_del_8_8(&sm->static_mapping_by_local, &kv, 1);
+ locals[i].prefix = locals[i - 1].prefix + locals[i].probability;
+ vec_add1 (m->locals, locals[i]);
+ m_key.port = clib_host_to_net_u16 (locals[i].port);
+ kv.key = m_key.as_u64;
+ kv.value = ~0ULL;
+ if (clib_bihash_add_del_8_8(&sm->in2out, &kv, 1))
+ {
+ clib_warning ("in2out key add failed");
+ return VNET_API_ERROR_UNSPECIFIED;
+ }
+ /* Assign worker */
+ if (sm->workers)
+ {
+ w_key0.addr = locals[i].addr;
+ w_key0.fib_index = fib_index;
+ kv.key = w_key0.as_u64;
+ kv.value = worker_index;
+ if (clib_bihash_add_del_8_8 (&sm->worker_by_in, &kv, 1))
+ {
+ clib_warning ("worker-by-in key add failed");
+ return VNET_API_ERROR_UNSPECIFIED;
+ }
+ }
+ }
+ }
+ else
+ {
+ if (!m)
+ return VNET_API_ERROR_NO_SUCH_ENTRY;
+
+ fib_table_unlock (m->fib_index, FIB_PROTOCOL_IP4);
+
+ /* Free external address port */
+ if (!sm->static_mapping_only)
+ {
+ for (i = 0; i < vec_len (sm->addresses); i++)
+ {
+ if (sm->addresses[i].addr.as_u32 == e_addr.as_u32)
+ {
+ a = sm->addresses + i;
+ switch (proto)
+ {
+#define _(N, j, n, s) \
+ case SNAT_PROTOCOL_##N: \
+ clib_bitmap_set_no_check (a->busy_##n##_port_bitmap, e_port, 0); \
+ if (e_port > 1024) \
+ a->busy_##n##_ports--; \
+ break;
+ foreach_snat_protocol
+#undef _
+ default:
+ clib_warning("unknown_protocol");
+ return VNET_API_ERROR_INVALID_VALUE_2;
+ }
+ break;
+ }
+ }
+ }
+
+ m_key.addr = m->external_addr;
+ m_key.port = m->external_port;
+ m_key.protocol = m->proto;
+ m_key.fib_index = sm->outside_fib_index;
+ kv.key = m_key.as_u64;
+ if (clib_bihash_add_del_8_8(&sm->static_mapping_by_external, &kv, 0))
+ {
+ clib_warning ("static_mapping_by_external key del failed");
+ return VNET_API_ERROR_UNSPECIFIED;
+ }
+ m_key.port = clib_host_to_net_u16 (m->external_port);
+ kv.key = m_key.as_u64;
+ if (clib_bihash_add_del_8_8(&sm->out2in, &kv, 0))
+ {
+ clib_warning ("outi2in key del failed");
+ return VNET_API_ERROR_UNSPECIFIED;
+ }
+
+ vec_foreach (local, m->locals)
+ {
+ m_key.addr = local->addr;
+ m_key.port = local->port;
+ m_key.fib_index = m->fib_index;
+ kv.key = m_key.as_u64;
+ if (clib_bihash_add_del_8_8(&sm->static_mapping_by_local, &kv, 0))
+ {
+ clib_warning ("static_mapping_by_local key del failed");
+ return VNET_API_ERROR_UNSPECIFIED;
+ }
+ m_key.port = clib_host_to_net_u16 (local->port);
+ kv.key = m_key.as_u64;
+ if (clib_bihash_add_del_8_8(&sm->in2out, &kv, 0))
+ {
+ clib_warning ("in2out key del failed");
+ return VNET_API_ERROR_UNSPECIFIED;
+ }
+ }
+
+ pool_put (sm->static_mappings, m);
+ }
+
+ return 0;
+}
+
int snat_del_address (snat_main_t *sm, ip4_address_t addr, u8 delete_sm)
{
snat_address_t *a = 0;
@@ -649,15 +887,16 @@ int snat_del_address (snat_main_t *sm, ip4_address_t addr, u8 delete_sm)
if (snat_is_unk_proto_session (ses))
{
clib_bihash_kv_16_8_t up_kv;
- snat_unk_proto_ses_key_t up_key;
+ nat_ed_ses_key_t up_key;
up_key.l_addr = ses->in2out.addr;
up_key.r_addr = ses->ext_host_addr;
up_key.fib_index = ses->in2out.fib_index;
up_key.proto = ses->in2out.port;
- up_key.rsvd[0] = up_key.rsvd[1] = up_key.rsvd[2] = 0;
+ up_key.rsvd = 0;
+ up_key.l_port = 0;
up_kv.key[0] = up_key.as_u64[0];
up_kv.key[1] = up_key.as_u64[1];
- if (clib_bihash_add_del_16_8 (&sm->in2out_unk_proto,
+ if (clib_bihash_add_del_16_8 (&sm->in2out_ed,
&up_kv, 0))
clib_warning ("in2out key del failed");
@@ -665,7 +904,7 @@ int snat_del_address (snat_main_t *sm, ip4_address_t addr, u8 delete_sm)
up_key.fib_index = ses->out2in.fib_index;
up_kv.key[0] = up_key.as_u64[0];
up_kv.key[1] = up_key.as_u64[1];
- if (clib_bihash_add_del_16_8 (&sm->out2in_unk_proto,
+ if (clib_bihash_add_del_16_8 (&sm->out2in_ed,
&up_kv, 0))
clib_warning ("out2in key del failed");
}
@@ -1048,6 +1287,7 @@ int snat_static_mapping_match (snat_main_t * sm,
snat_static_mapping_t *m;
snat_session_key_t m_key;
clib_bihash_8_8_t *mapping_hash = &sm->static_mapping_by_local;
+ u32 rand, lo = 0, hi, mid;
if (by_external)
mapping_hash = &sm->static_mapping_by_external;
@@ -1073,11 +1313,29 @@ int snat_static_mapping_match (snat_main_t * sm,
if (by_external)
{
- mapping->addr = m->local_addr;
- /* Address only mapping doesn't change port */
- mapping->port = m->addr_only ? match.port
- : clib_host_to_net_u16 (m->local_port);
+ if (vec_len (m->locals))
+ {
+ hi = vec_len (m->locals) - 1;
+ rand = 1 + (random_u32 (&sm->random_seed) % m->locals[hi].prefix);
+ while (lo < hi)
+ {
+ mid = ((hi - 1) >> 1) + lo;
+ (rand > m->locals[mid].prefix) ? (lo = mid + 1) : (hi = mid);
+ }
+ if (!(m->locals[lo].prefix >= rand))
+ return 1;
+ mapping->addr = m->locals[lo].addr;
+ mapping->port = clib_host_to_net_u16 (m->locals[lo].port);
+ }
+ else
+ {
+ mapping->addr = m->local_addr;
+ /* Address only mapping doesn't change port */
+ mapping->port = m->addr_only ? match.port
+ : clib_host_to_net_u16 (m->local_port);
+ }
mapping->fib_index = m->fib_index;
+ mapping->protocol = m->proto;
}
else
{
@@ -1518,6 +1776,101 @@ VLIB_CLI_COMMAND (add_static_mapping_command, static) = {
};
static clib_error_t *
+add_lb_static_mapping_command_fn (vlib_main_t * vm,
+ unformat_input_t * input,
+ vlib_cli_command_t * cmd)
+{
+ unformat_input_t _line_input, *line_input = &_line_input;
+ clib_error_t * error = 0;
+ ip4_address_t l_addr, e_addr;
+ u32 l_port = 0, e_port = 0, vrf_id = 0, probability = 0;
+ int is_add = 1;
+ int rv;
+ snat_protocol_t proto;
+ u8 proto_set = 0;
+ nat44_lb_addr_port_t *locals = 0, local;
+
+ /* Get a line of input. */
+ if (!unformat_user (input, unformat_line_input, line_input))
+ return 0;
+
+ while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
+ {
+ if (unformat (line_input, "local %U:%u probability %u",
+ unformat_ip4_address, &l_addr, &l_port, &probability))
+ {
+ memset (&local, 0, sizeof (local));
+ local.addr = l_addr;
+ local.port = (u16) l_port;
+ local.probability = (u8) probability;
+ vec_add1 (locals, local);
+ }
+ else if (unformat (line_input, "external %U:%u", unformat_ip4_address,
+ &e_addr, &e_port))
+ ;
+ else if (unformat (line_input, "vrf %u", &vrf_id))
+ ;
+ else if (unformat (line_input, "protocol %U", unformat_snat_protocol,
+ &proto))
+ proto_set = 1;
+ else if (unformat (line_input, "del"))
+ is_add = 0;
+ else
+ {
+ error = clib_error_return (0, "unknown input: '%U'",
+ format_unformat_error, line_input);
+ goto done;
+ }
+ }
+
+ if (vec_len (locals) < 2)
+ {
+ error = clib_error_return (0, "at least two local must be set");
+ goto done;
+ }
+
+ if (!proto_set)
+ {
+ error = clib_error_return (0, "missing protocol");
+ goto done;
+ }
+
+ rv = nat44_add_del_lb_static_mapping (e_addr, (u16) e_port, proto, vrf_id,
+ locals, is_add);
+
+ switch (rv)
+ {
+ case VNET_API_ERROR_INVALID_VALUE:
+ error = clib_error_return (0, "External port already in use.");
+ goto done;
+ case VNET_API_ERROR_NO_SUCH_ENTRY:
+ if (is_add)
+ error = clib_error_return (0, "External addres must be allocated.");
+ else
+ error = clib_error_return (0, "Mapping not exist.");
+ goto done;
+ case VNET_API_ERROR_VALUE_EXIST:
+ error = clib_error_return (0, "Mapping already exist.");
+ goto done;
+ default:
+ break;
+ }
+
+done:
+ unformat_free (line_input);
+ vec_free (locals);
+
+ return error;
+}
+
+VLIB_CLI_COMMAND (add_lb_static_mapping_command, static) = {
+ .path = "nat44 add load-balancing static mapping",
+ .function = add_lb_static_mapping_command_fn,
+ .short_help =
+ "nat44 add load-balancing static mapping protocol tcp|udp external <addr>:<port> local <addr>:<port> probability <n> [vrf <table-id>] [del]",
+};
+
+static clib_error_t *
set_workers_command_fn (vlib_main_t * vm,
unformat_input_t * input,
vlib_cli_command_t * cmd)
@@ -1839,10 +2192,10 @@ snat_config (vlib_main_t * vm, unformat_input_t * input)
clib_bihash_init_8_8 (&sm->user_hash, "users", user_buckets,
user_memory_size);
- clib_bihash_init_16_8 (&sm->in2out_unk_proto, "in2out-unk-proto",
+ clib_bihash_init_16_8 (&sm->in2out_ed, "in2out-ed",
translation_buckets, translation_memory_size);
- clib_bihash_init_16_8 (&sm->out2in_unk_proto, "out2in-unk-proto",
+ clib_bihash_init_16_8 (&sm->out2in_ed, "out2in-ed",
translation_buckets, translation_memory_size);
}
else
@@ -1884,18 +2237,10 @@ u8 * format_snat_session_state (u8 * s, va_list * args)
u8 * format_snat_key (u8 * s, va_list * args)
{
snat_session_key_t * key = va_arg (*args, snat_session_key_t *);
- char * protocol_string = "unknown";
- static char *protocol_strings[] = {
- "UDP",
- "TCP",
- "ICMP",
- };
-
- if (key->protocol < ARRAY_LEN(protocol_strings))
- protocol_string = protocol_strings[key->protocol];
- s = format (s, "%U proto %s port %d fib %d",
- format_ip4_address, &key->addr, protocol_string,
+ s = format (s, "%U proto %U port %d fib %d",
+ format_ip4_address, &key->addr,
+ format_snat_protocol, key->protocol,
clib_net_to_host_u16 (key->port), key->fib_index);
return s;
}
@@ -1919,6 +2264,9 @@ u8 * format_snat_session (u8 * s, va_list * args)
s = format (s, " i2o %U\n", format_snat_key, &sess->in2out);
s = format (s, " o2i %U\n", format_snat_key, &sess->out2in);
}
+ if (sess->ext_host_addr.as_u32)
+ s = format (s, " external host %U\n",
+ format_ip4_address, &sess->ext_host_addr);
s = format (s, " last heard %.2f\n", sess->last_heard);
s = format (s, " total pkts %d, total bytes %lld\n",
sess->total_pkts, sess->total_bytes);
@@ -1926,6 +2274,8 @@ u8 * format_snat_session (u8 * s, va_list * args)
s = format (s, " static translation\n");
else
s = format (s, " dynamic translation\n");
+ if (sess->flags & SNAT_SESSION_FLAG_LOAD_BALANCING)
+ s = format (s, " load-balancing\n");
return s;
}
@@ -1973,6 +2323,7 @@ u8 * format_snat_user (u8 * s, va_list * args)
u8 * format_snat_static_mapping (u8 * s, va_list * args)
{
snat_static_mapping_t *m = va_arg (*args, snat_static_mapping_t *);
+ nat44_lb_addr_port_t *local;
if (m->addr_only)
s = format (s, "local %U external %U vrf %d",
@@ -1980,12 +2331,25 @@ u8 * format_snat_static_mapping (u8 * s, va_list * args)
format_ip4_address, &m->external_addr,
m->vrf_id);
else
- s = format (s, "%U local %U:%d external %U:%d vrf %d",
- format_snat_protocol, m->proto,
- format_ip4_address, &m->local_addr, m->local_port,
- format_ip4_address, &m->external_addr, m->external_port,
- m->vrf_id);
-
+ {
+ if (vec_len (m->locals))
+ {
+ s = format (s, "%U vrf %d external %U:%d",
+ format_snat_protocol, m->proto,
+ m->vrf_id,
+ format_ip4_address, &m->external_addr, m->external_port);
+ vec_foreach (local, m->locals)
+ s = format (s, "\n local %U:%d probability %d\%",
+ format_ip4_address, &local->addr, local->port,
+ local->probability);
+ }
+ else
+ s = format (s, "%U local %U:%d external %U:%d vrf %d",
+ format_snat_protocol, m->proto,
+ format_ip4_address, &m->local_addr, m->local_port,
+ format_ip4_address, &m->external_addr, m->external_port,
+ m->vrf_id);
+ }
return s;
}
@@ -2208,6 +2572,10 @@ show_snat_command_fn (vlib_main_t * vm,
verbose - 1);
vlib_cli_output (vm, "%U", format_bihash_8_8, &sm->out2in,
verbose - 1);
+ vlib_cli_output (vm, "%U", format_bihash_16_8, &sm->in2out_ed,
+ verbose - 1);
+ vlib_cli_output (vm, "%U", format_bihash_16_8, &sm->out2in_ed,
+ verbose - 1);
vlib_cli_output (vm, "%U", format_bihash_8_8, &sm->worker_by_in,
verbose - 1);
vlib_cli_output (vm, "%U", format_bihash_8_8, &sm->worker_by_out,