return s;
}
-/**
- * @brief Check if packet should be translated
- *
- * Packets aimed at outside interface and external address with active session
- * should be translated.
- *
- * @param sm NAT main
- * @param rt NAT runtime data
- * @param sw_if_index0 index of the inside interface
- * @param ip0 IPv4 header
- * @param rx_fib_index0 RX FIB index
- *
- * @returns 0 if packet should be translated otherwise 1
- */
-static inline int
-snat_not_translate_fast (snat_main_t *sm, vlib_node_runtime_t *node,
- u32 sw_if_index0, ip4_header_t *ip0,
- u32 rx_fib_index0)
-{
- fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
- nat_outside_fib_t *outside_fib;
- fib_prefix_t pfx = {
- .fp_proto = FIB_PROTOCOL_IP4,
- .fp_len = 32,
- .fp_addr = {
- .ip4.as_u32 = ip0->dst_address.as_u32,
- }
- ,
- };
-
- /* Don't NAT packet aimed at the intfc address */
- if (PREDICT_FALSE (
- is_interface_addr (sm, node, sw_if_index0, ip0->dst_address.as_u32)))
- return 1;
-
- fei = fib_table_lookup (rx_fib_index0, &pfx);
- if (FIB_NODE_INDEX_INVALID != fei)
- {
- u32 sw_if_index = fib_entry_get_resolving_interface (fei);
- if (sw_if_index == ~0)
- {
- vec_foreach (outside_fib, sm->outside_fibs)
- {
- fei = fib_table_lookup (outside_fib->fib_index, &pfx);
- if (FIB_NODE_INDEX_INVALID != fei)
- {
- sw_if_index = fib_entry_get_resolving_interface (fei);
- if (sw_if_index != ~0)
- break;
- }
- }
- }
- if (sw_if_index == ~0)
- return 1;
-
- snat_interface_t *i;
- pool_foreach (i, sm->interfaces)
- {
- /* NAT packet aimed at outside interface */
- if ((nat44_ed_is_interface_outside (i)) &&
- (sw_if_index == i->sw_if_index))
- return 0;
- }
- }
-
- return 1;
-}
-
static int
nat_ed_alloc_addr_and_port_with_snat_address (
snat_main_t *sm, u8 proto, u32 thread_index, snat_address_t *a,
return 1;
}
-static_always_inline u32
-nat_outside_fib_index_lookup (snat_main_t * sm, ip4_address_t addr)
-{
- fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
- nat_outside_fib_t *outside_fib;
- fib_prefix_t pfx = {
- .fp_proto = FIB_PROTOCOL_IP4,
- .fp_len = 32,
- .fp_addr = {.ip4.as_u32 = addr.as_u32,}
- ,
- };
- vec_foreach (outside_fib, sm->outside_fibs)
- {
- fei = fib_table_lookup (outside_fib->fib_index, &pfx);
- if (FIB_NODE_INDEX_INVALID != fei)
- {
- if (fib_entry_get_resolving_interface (fei) != ~0)
- {
- return outside_fib->fib_index;
- }
- }
- }
- return ~0;
-}
-
static_always_inline int
nat44_ed_external_sm_lookup (snat_main_t *sm, ip4_address_t match_addr,
u16 match_port, ip_protocol_t match_protocol,
return 1;
}
+static_always_inline vrf_table_t *
+get_vrf_table_by_fib (u32 fib_index)
+{
+ snat_main_t *sm = &snat_main;
+ vrf_table_t *t;
+
+ pool_foreach (t, sm->vrf_tables)
+ {
+ if (fib_index == t->table_fib_index)
+ {
+ return t;
+ }
+ }
+
+ return 0;
+}
+
+static_always_inline u32
+get_tx_fib_index (u32 rx_fib_index, ip4_address_t addr)
+{
+ fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
+ fib_prefix_t pfx = {
+ .fp_proto = FIB_PROTOCOL_IP4,
+ .fp_len = 32,
+ .fp_addr = {.ip4.as_u32 = addr.as_u32,}
+ ,
+ };
+
+ snat_main_t *sm = &snat_main;
+ vrf_table_t *t = get_vrf_table_by_fib (rx_fib_index);
+ // default to rx fib
+ u32 tx_fib_index = rx_fib_index;
+
+ if (0 != t)
+ {
+ // managed routes to other fibs
+ vrf_route_t *r;
+ pool_foreach (r, t->routes)
+ {
+ fei = fib_table_lookup (r->fib_index, &pfx);
+ if ((FIB_NODE_INDEX_INVALID != fei) &&
+ (~0 != fib_entry_get_resolving_interface (fei)))
+ {
+ tx_fib_index = r->fib_index;
+ break;
+ }
+ }
+ }
+ else
+ {
+ // default to configured fib
+ tx_fib_index = sm->outside_fib_index;
+
+ // default routes to other fibs
+ nat_fib_t *f;
+ vec_foreach (f, sm->outside_fibs)
+ {
+ fei = fib_table_lookup (f->fib_index, &pfx);
+ if ((FIB_NODE_INDEX_INVALID != fei) &&
+ (~0 != fib_entry_get_resolving_interface (fei)))
+ {
+ tx_fib_index = f->fib_index;
+ break;
+ }
+ }
+ }
+
+ return tx_fib_index;
+}
+
+static_always_inline int
+is_destination_resolvable (u32 rx_fib_index, ip4_address_t addr)
+{
+ fib_node_index_t fei = FIB_NODE_INDEX_INVALID;
+ fib_prefix_t pfx = {
+ .fp_proto = FIB_PROTOCOL_IP4,
+ .fp_len = 32,
+ .fp_addr = {.ip4.as_u32 = addr.as_u32,}
+ ,
+ };
+
+ snat_main_t *sm = &snat_main;
+ vrf_table_t *t = get_vrf_table_by_fib (rx_fib_index);
+ u32 ii;
+
+ if (0 != t)
+ {
+ // managed routes to other fibs
+ vrf_route_t *r;
+ pool_foreach (r, t->routes)
+ {
+ fei = fib_table_lookup (r->fib_index, &pfx);
+ if ((FIB_NODE_INDEX_INVALID != fei) &&
+ (~0 != (ii = fib_entry_get_resolving_interface (fei))))
+ {
+ return 1;
+ }
+ }
+ }
+ else
+ {
+ // default routes to other fibs
+ nat_fib_t *f;
+ vec_foreach (f, sm->outside_fibs)
+ {
+ fei = fib_table_lookup (f->fib_index, &pfx);
+ if ((FIB_NODE_INDEX_INVALID != fei) &&
+ (~0 != (ii = fib_entry_get_resolving_interface (fei))))
+ {
+ snat_interface_t *i;
+ pool_foreach (i, sm->interfaces)
+ {
+ if ((nat44_ed_is_interface_outside (i)) &&
+ (ii == i->sw_if_index))
+ {
+ return 1;
+ }
+ }
+ }
+ }
+ }
+
+ return 0;
+}
+
static u32
slow_path_ed (vlib_main_t *vm, snat_main_t *sm, vlib_buffer_t *b,
ip4_address_t l_addr, ip4_address_t r_addr, u16 l_port,
snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
ip4_address_t outside_addr;
u16 outside_port;
- u32 outside_fib_index;
+ u32 tx_fib_index;
u8 is_identity_nat = 0;
snat_session_t *s = NULL;
}
}
- outside_fib_index = sm->outside_fib_index;
-
- switch (vec_len (sm->outside_fibs))
- {
- case 0:
- outside_fib_index = sm->outside_fib_index;
- break;
- case 1:
- outside_fib_index = sm->outside_fibs[0].fib_index;
- break;
- default:
- outside_fib_index = nat_outside_fib_index_lookup (sm, r_addr);
- break;
- }
-
ip4_address_t sm_addr;
u16 sm_port;
u32 sm_fib_index;
- /* First try to match static mapping by local address and port */
- int is_sm;
- if (snat_static_mapping_match (vm, sm, l_addr, l_port, rx_fib_index, proto,
- &sm_addr, &sm_port, &sm_fib_index, 0, 0, 0,
- &lb, 0, &is_identity_nat, 0))
- {
- is_sm = 0;
- }
- else
+ int is_sm = 0;
+ // First try to match static mapping by local address and port
+ if (!snat_static_mapping_match (vm, l_addr, l_port, rx_fib_index, proto,
+ &sm_addr, &sm_port, &sm_fib_index, 0, 0, 0,
+ &lb, 0, &is_identity_nat, 0))
{
if (PREDICT_FALSE (is_identity_nat))
{
s = nat_ed_session_alloc (sm, thread_index, now, proto);
ASSERT (s);
+ tx_fib_index = get_tx_fib_index (rx_fib_index, r_addr);
+
if (!is_sm)
{
s->in2out.addr = l_addr;
s->in2out.port = l_port;
s->proto = proto;
s->in2out.fib_index = rx_fib_index;
- s->out2in.fib_index = outside_fib_index;
+ s->out2in.fib_index = tx_fib_index;
// suggest using local port to allocation function
outside_port = l_port;
- // hairpinning?
- int is_hairpinning = nat44_ed_external_sm_lookup (sm, r_addr, r_port,
- proto, &daddr, &dport);
- s->flags |= is_hairpinning * SNAT_SESSION_FLAG_HAIRPINNING;
+ if (PREDICT_FALSE (nat44_ed_external_sm_lookup (sm, r_addr, r_port,
+ proto, &daddr, &dport)))
+ {
+ s->flags |= SNAT_SESSION_FLAG_HAIRPINNING;
+ }
// destination addr/port updated with real values in
// nat_ed_alloc_addr_and_port
s->in2out.port = l_port;
s->proto = proto;
s->in2out.fib_index = rx_fib_index;
- s->out2in.fib_index = outside_fib_index;
+ s->out2in.fib_index = tx_fib_index;
s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
// hairpinning?
nat_6t_flow_sport_rewrite_set (&s->i2o, outside_port);
nat_6t_flow_dport_rewrite_set (&s->i2o, dport);
}
- nat_6t_flow_txfib_rewrite_set (&s->i2o, outside_fib_index);
+ nat_6t_flow_txfib_rewrite_set (&s->i2o, tx_fib_index);
if (nat_ed_ses_i2o_flow_hash_add_del (sm, thread_index, s, 1))
{
}
static_always_inline int
-nat44_ed_not_translate (vlib_main_t *vm, snat_main_t *sm,
- vlib_node_runtime_t *node, u32 sw_if_index,
- vlib_buffer_t *b, ip4_header_t *ip, u32 proto,
- u32 rx_fib_index)
+nat44_ed_not_translate (vlib_main_t *vm, vlib_node_runtime_t *node,
+ u32 sw_if_index, vlib_buffer_t *b, ip4_header_t *ip,
+ u32 proto, u32 rx_fib_index)
{
+ snat_main_t *sm = &snat_main;
+
clib_bihash_kv_16_8_t kv, value;
+ ip4_address_t placeholder_addr;
+ u32 placeholder_fib_index;
+ u16 placeholder_port;
init_ed_k (&kv, ip->dst_address.as_u32,
vnet_buffer (b)->ip.reass.l4_dst_port, ip->src_address.as_u32,
vnet_buffer (b)->ip.reass.l4_src_port, sm->outside_fib_index,
ip->protocol);
- /* NAT packet aimed at external address if has active sessions */
- if (clib_bihash_search_16_8 (&sm->flow_hash, &kv, &value))
+ // do nat if active session or is static mapping
+ if (!clib_bihash_search_16_8 (&sm->flow_hash, &kv, &value) ||
+ !snat_static_mapping_match (
+ vm, ip->dst_address, vnet_buffer (b)->ip.reass.l4_dst_port,
+ sm->outside_fib_index, proto, &placeholder_addr, &placeholder_port,
+ &placeholder_fib_index, 1, 0, 0, 0, 0, 0, 0))
{
- /* or is static mappings */
- ip4_address_t placeholder_addr;
- u16 placeholder_port;
- u32 placeholder_fib_index;
- if (!snat_static_mapping_match (
- vm, sm, ip->dst_address, vnet_buffer (b)->ip.reass.l4_dst_port,
- sm->outside_fib_index, proto, &placeholder_addr, &placeholder_port,
- &placeholder_fib_index, 1, 0, 0, 0, 0, 0, 0))
- return 0;
+ return 0;
}
- else
- return 0;
+ // do not nat if forwarding enabled
if (sm->forwarding_enabled)
- return 1;
+ {
+ return 1;
+ }
- return snat_not_translate_fast (sm, node, sw_if_index, ip, rx_fib_index);
+ // do not nat packet aimed at the interface address
+ if (PREDICT_FALSE (
+ is_interface_addr (sm, node, sw_if_index, ip->dst_address.as_u32)))
+ {
+ return 1;
+ }
+
+ // do nat packets with resolvable destination
+ // destination can be resolved either by:
+ // a) vrf routing table entry
+ // b) (non output feature) outside interface fib
+ if (is_destination_resolvable (rx_fib_index, ip->dst_address))
+ {
+ return 0;
+ }
+
+ return 1;
}
static_always_inline int
else
{
if (PREDICT_FALSE (nat44_ed_not_translate (
- vm, sm, node, sw_if_index, b, ip, IP_PROTOCOL_ICMP, rx_fib_index)))
+ vm, node, sw_if_index, b, ip, IP_PROTOCOL_ICMP, rx_fib_index)))
{
return next;
}
snat_static_mapping_t *m = NULL;
snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index];
snat_session_t *s = NULL;
- u32 outside_fib_index = sm->outside_fib_index;
+ u32 tx_fib_index;
int i;
ip4_address_t new_src_addr = { 0 };
ip4_address_t new_dst_addr = ip->dst_address;
return 0;
}
- switch (vec_len (sm->outside_fibs))
- {
- case 0:
- outside_fib_index = sm->outside_fib_index;
- break;
- case 1:
- outside_fib_index = sm->outside_fibs[0].fib_index;
- break;
- default:
- outside_fib_index = nat_outside_fib_index_lookup (sm, ip->dst_address);
- break;
- }
+ tx_fib_index = get_tx_fib_index (rx_fib_index, ip->dst_address);
- /* Try to find static mapping first */
+ // Try to find static mapping first
m = nat44_ed_sm_i2o_lookup (sm, ip->src_address, 0, rx_fib_index,
ip->protocol);
if (m)
if (s->ext_host_addr.as_u32 == ip->dst_address.as_u32)
{
init_ed_k (&s_kv, s->out2in.addr.as_u32, 0,
- ip->dst_address.as_u32, 0, outside_fib_index,
+ ip->dst_address.as_u32, 0, tx_fib_index,
ip->protocol);
if (clib_bihash_search_16_8 (&sm->flow_hash, &s_kv, &s_value))
{
for (i = 0; i < vec_len (sm->addresses); i++)
{
init_ed_k (&s_kv, sm->addresses[i].addr.as_u32, 0,
- ip->dst_address.as_u32, 0, outside_fib_index,
+ ip->dst_address.as_u32, 0, tx_fib_index,
ip->protocol);
if (clib_bihash_search_16_8 (&sm->flow_hash, &s_kv, &s_value))
{
nat_6t_i2o_flow_init (sm, thread_index, s, ip->src_address, 0,
ip->dst_address, 0, rx_fib_index, ip->protocol);
nat_6t_flow_saddr_rewrite_set (&s->i2o, new_src_addr.as_u32);
- nat_6t_flow_txfib_rewrite_set (&s->i2o, outside_fib_index);
+ nat_6t_flow_txfib_rewrite_set (&s->i2o, tx_fib_index);
// hairpinning?
int is_hairpinning = nat44_ed_external_sm_lookup (
s->flags |= is_hairpinning * SNAT_SESSION_FLAG_HAIRPINNING;
nat_6t_flow_daddr_rewrite_set (&s->i2o, new_dst_addr.as_u32);
- nat_6t_flow_txfib_rewrite_set (&s->i2o, outside_fib_index);
+ nat_6t_flow_txfib_rewrite_set (&s->i2o, tx_fib_index);
nat_6t_o2i_flow_init (sm, thread_index, s, new_dst_addr, 0, new_src_addr, 0,
- outside_fib_index, ip->protocol);
+ tx_fib_index, ip->protocol);
nat_6t_flow_saddr_rewrite_set (&s->o2i, ip->dst_address.as_u32);
nat_6t_flow_daddr_rewrite_set (&s->o2i, ip->src_address.as_u32);
nat_6t_flow_txfib_rewrite_set (&s->o2i, rx_fib_index);
s->ext_host_addr.as_u32 = ip->dst_address.as_u32;
s->out2in.addr.as_u32 = new_src_addr.as_u32;
- s->out2in.fib_index = outside_fib_index;
+ s->out2in.fib_index = tx_fib_index;
s->in2out.addr.as_u32 = ip->src_address.as_u32;
s->in2out.fib_index = rx_fib_index;
s->in2out.port = s->out2in.port = ip->protocol;
else
{
if (PREDICT_FALSE (
- nat44_ed_not_translate (vm, sm, node, rx_sw_if_index0, b0,
- ip0, proto0, rx_fib_index0)))
+ nat44_ed_not_translate (vm, node, rx_sw_if_index0, b0, ip0,
+ proto0, rx_fib_index0)))
goto trace0;
}
Code Review / vpp.git / blobdiff