vlib_node_registration_t snat_in2out_output_node;
vlib_node_registration_t snat_in2out_output_slowpath_node;
vlib_node_registration_t snat_in2out_output_worker_handoff_node;
+vlib_node_registration_t snat_hairpin_dst_node;
+vlib_node_registration_t snat_hairpin_src_node;
+
#define foreach_snat_in2out_error \
_(UNSUPPORTED_PROTOCOL, "Unsupported protocol") \
SNAT_IN2OUT_N_NEXT,
} snat_in2out_next_t;
+typedef enum {
+ SNAT_HAIRPIN_SRC_NEXT_DROP,
+ SNAT_HAIRPIN_SRC_NEXT_SNAT_IN2OUT,
+ SNAT_HAIRPIN_SRC_NEXT_SNAT_IN2OUT_WH,
+ SNAT_HAIRPIN_SRC_NEXT_INTERFACE_OUTPUT,
+ SNAT_HAIRPIN_SRC_N_NEXT,
+} snat_hairpin_next_t;
+
/**
* @brief Check if packet should be translated
*
}
}
+static inline void
+snat_icmp_hairpinning (snat_main_t *sm,
+ vlib_buffer_t * b0,
+ ip4_header_t * ip0,
+ icmp46_header_t * icmp0)
+{
+ snat_session_key_t key0, sm0;
+ clib_bihash_kv_8_8_t kv0, value0;
+ snat_worker_key_t k0;
+ u32 new_dst_addr0 = 0, old_dst_addr0, si, ti = 0;
+ ip_csum_t sum0;
+ snat_session_t *s0;
+
+ if (!icmp_is_error_message (icmp0))
+ {
+ icmp_echo_header_t *echo0 = (icmp_echo_header_t *)(icmp0+1);
+ u16 icmp_id0 = echo0->identifier;
+ key0.addr = ip0->dst_address;
+ key0.port = icmp_id0;
+ key0.protocol = SNAT_PROTOCOL_ICMP;
+ key0.fib_index = sm->outside_fib_index;
+ kv0.key = key0.as_u64;
+
+ /* Check if destination is in active sessions */
+ if (clib_bihash_search_8_8 (&sm->out2in, &kv0, &value0))
+ {
+ /* or static mappings */
+ if (!snat_static_mapping_match(sm, key0, &sm0, 1, 0))
+ {
+ new_dst_addr0 = sm0.addr.as_u32;
+ vnet_buffer(b0)->sw_if_index[VLIB_TX] = sm0.fib_index;
+ }
+ }
+ else
+ {
+ si = value0.value;
+ if (sm->num_workers > 1)
+ {
+ k0.addr = ip0->dst_address;
+ k0.port = icmp_id0;
+ k0.fib_index = sm->outside_fib_index;
+ kv0.key = k0.as_u64;
+ if (clib_bihash_search_8_8 (&sm->worker_by_out, &kv0, &value0))
+ ASSERT(0);
+ else
+ ti = value0.value;
+ }
+ else
+ ti = sm->num_workers;
+
+ s0 = pool_elt_at_index (sm->per_thread_data[ti].sessions, si);
+ new_dst_addr0 = s0->in2out.addr.as_u32;
+ vnet_buffer(b0)->sw_if_index[VLIB_TX] = s0->in2out.fib_index;
+ echo0->identifier = s0->in2out.port;
+ sum0 = icmp0->checksum;
+ sum0 = ip_csum_update (sum0, icmp_id0, s0->in2out.port,
+ icmp_echo_header_t, identifier);
+ icmp0->checksum = ip_csum_fold (sum0);
+ }
+
+ /* Destination is behind the same NAT, use internal address and port */
+ if (new_dst_addr0)
+ {
+ old_dst_addr0 = ip0->dst_address.as_u32;
+ ip0->dst_address.as_u32 = new_dst_addr0;
+ sum0 = ip0->checksum;
+ sum0 = ip_csum_update (sum0, old_dst_addr0, new_dst_addr0,
+ ip4_header_t, dst_address);
+ ip0->checksum = ip_csum_fold (sum0);
+ }
+ }
+
+}
+
static inline u32 icmp_in2out_slow_path (snat_main_t *sm,
vlib_buffer_t * b0,
ip4_header_t * ip0,
u32 thread_index,
snat_session_t ** p_s0)
{
- snat_session_key_t key0, sm0;
- clib_bihash_kv_8_8_t kv0, value0;
- snat_worker_key_t k0;
- u32 new_dst_addr0 = 0, old_dst_addr0, si, ti = 0;
- ip_csum_t sum0;
-
next0 = icmp_in2out(sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
next0, thread_index, p_s0, 0);
snat_session_t * s0 = *p_s0;
if (PREDICT_TRUE(next0 != SNAT_IN2OUT_NEXT_DROP && s0))
{
/* Hairpinning */
- if (!icmp_is_error_message (icmp0))
- {
- icmp_echo_header_t *echo0 = (icmp_echo_header_t *)(icmp0+1);
- u16 icmp_id0 = echo0->identifier;
- key0.addr = ip0->dst_address;
- key0.port = icmp_id0;
- key0.protocol = SNAT_PROTOCOL_ICMP;
- key0.fib_index = sm->outside_fib_index;
- kv0.key = key0.as_u64;
-
- /* Check if destination is in active sessions */
- if (clib_bihash_search_8_8 (&sm->out2in, &kv0, &value0))
- {
- /* or static mappings */
- if (!snat_static_mapping_match(sm, key0, &sm0, 1, 0))
- {
- new_dst_addr0 = sm0.addr.as_u32;
- vnet_buffer(b0)->sw_if_index[VLIB_TX] = sm0.fib_index;
- }
- }
- else
- {
- si = value0.value;
- if (sm->num_workers > 1)
- {
- k0.addr = ip0->dst_address;
- k0.port = icmp_id0;
- k0.fib_index = sm->outside_fib_index;
- kv0.key = k0.as_u64;
- if (clib_bihash_search_8_8 (&sm->worker_by_out, &kv0, &value0))
- ASSERT(0);
- else
- ti = value0.value;
- }
- else
- ti = sm->num_workers;
-
- s0 = pool_elt_at_index (sm->per_thread_data[ti].sessions, si);
- new_dst_addr0 = s0->in2out.addr.as_u32;
- vnet_buffer(b0)->sw_if_index[VLIB_TX] = s0->in2out.fib_index;
- echo0->identifier = s0->in2out.port;
- sum0 = icmp0->checksum;
- sum0 = ip_csum_update (sum0, icmp_id0, s0->in2out.port,
- icmp_echo_header_t, identifier);
- icmp0->checksum = ip_csum_fold (sum0);
- }
-
- /* Destination is behind the same NAT, use internal address and port */
- if (new_dst_addr0)
- {
- old_dst_addr0 = ip0->dst_address.as_u32;
- ip0->dst_address.as_u32 = new_dst_addr0;
- sum0 = ip0->checksum;
- sum0 = ip_csum_update (sum0, old_dst_addr0, new_dst_addr0,
- ip4_header_t, dst_address);
- ip0->checksum = ip_csum_fold (sum0);
- }
- }
-
+ if (vnet_buffer(b0)->sw_if_index[VLIB_TX] == 0)
+ snat_icmp_hairpinning(sm, b0, ip0, icmp0);
/* Accounting */
s0->last_heard = now;
s0->total_pkts++;
}
return next0;
}
+static inline void
+snat_hairpinning_unknown_proto (snat_main_t *sm,
+ vlib_buffer_t * b,
+ ip4_header_t * ip)
+{
+ u32 old_addr, new_addr = 0, ti = 0;
+ clib_bihash_kv_8_8_t kv, value;
+ clib_bihash_kv_16_8_t s_kv, s_value;
+ snat_unk_proto_ses_key_t key;
+ snat_session_key_t m_key;
+ snat_worker_key_t w_key;
+ snat_static_mapping_t *m;
+ ip_csum_t sum;
+ snat_session_t *s;
+
+ old_addr = ip->dst_address.as_u32;
+ key.l_addr.as_u32 = ip->dst_address.as_u32;
+ key.r_addr.as_u32 = ip->src_address.as_u32;
+ key.fib_index = sm->outside_fib_index;
+ key.proto = ip->protocol;
+ key.rsvd[0] = key.rsvd[1] = key.rsvd[2] = 0;
+ s_kv.key[0] = key.as_u64[0];
+ s_kv.key[1] = key.as_u64[1];
+ if (clib_bihash_search_16_8 (&sm->out2in_unk_proto, &s_kv, &s_value))
+ {
+ m_key.addr = ip->dst_address;
+ m_key.fib_index = sm->outside_fib_index;
+ m_key.port = 0;
+ m_key.protocol = 0;
+ kv.key = m_key.as_u64;
+ if (clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value))
+ return;
+
+ m = pool_elt_at_index (sm->static_mappings, value.value);
+ if (vnet_buffer(b)->sw_if_index[VLIB_TX] == ~0)
+ vnet_buffer(b)->sw_if_index[VLIB_TX] = m->fib_index;
+ new_addr = ip->dst_address.as_u32 = m->local_addr.as_u32;
+ }
+ else
+ {
+ if (sm->num_workers > 1)
+ {
+ w_key.addr = ip->dst_address;
+ w_key.port = 0;
+ w_key.fib_index = sm->outside_fib_index;
+ kv.key = w_key.as_u64;
+ if (clib_bihash_search_8_8 (&sm->worker_by_out, &kv, &value))
+ return;
+ else
+ ti = value.value;
+ }
+ else
+ ti = sm->num_workers;
+
+ s = pool_elt_at_index (sm->per_thread_data[ti].sessions, s_value.value);
+ if (vnet_buffer(b)->sw_if_index[VLIB_TX] == ~0)
+ vnet_buffer(b)->sw_if_index[VLIB_TX] = s->in2out.fib_index;
+ new_addr = ip->dst_address.as_u32 = s->in2out.addr.as_u32;
+ }
+ sum = ip->checksum;
+ sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, dst_address);
+ ip->checksum = ip_csum_fold (sum);
+}
static void
snat_in2out_unknown_proto (snat_main_t *sm,
s->per_user_index);
/* Hairpinning */
- old_addr = ip->dst_address.as_u32;
- key.l_addr.as_u32 = ip->dst_address.as_u32;
- key.r_addr.as_u32 = new_addr;
- key.fib_index = sm->outside_fib_index;
- s_kv.key[0] = key.as_u64[0];
- s_kv.key[1] = key.as_u64[1];
- if (clib_bihash_search_16_8 (&sm->out2in_unk_proto, &s_kv, &s_value))
- {
- m_key.addr = ip->dst_address;
- 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))
- {
- if (vnet_buffer(b)->sw_if_index[VLIB_TX] == ~0)
- vnet_buffer(b)->sw_if_index[VLIB_TX] = sm->outside_fib_index;
- return;
- }
+ if (vnet_buffer(b)->sw_if_index[VLIB_TX] == ~0)
+ snat_hairpinning_unknown_proto(sm, b, ip);
- m = pool_elt_at_index (sm->static_mappings, value.value);
- vnet_buffer(b)->sw_if_index[VLIB_TX] = m->fib_index;
- new_addr = ip->dst_address.as_u32 = m->local_addr.as_u32;
- }
- else
- {
- s = pool_elt_at_index (tsm->sessions, s_value.value);
- vnet_buffer(b)->sw_if_index[VLIB_TX] = s->in2out.fib_index;
- new_addr = ip->dst_address.as_u32 = s->in2out.addr.as_u32;
- }
- sum = ip->checksum;
- sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, dst_address);
- ip->checksum = ip_csum_fold (sum);
+ if (vnet_buffer(b)->sw_if_index[VLIB_TX] == ~0)
+ vnet_buffer(b)->sw_if_index[VLIB_TX] = sm->outside_fib_index;
}
static inline uword
}
/* Hairpinning */
- snat_hairpinning (sm, b0, ip0, udp0, tcp0, proto0);
+ if (!is_output_feature)
+ snat_hairpinning (sm, b0, ip0, udp0, tcp0, proto0);
/* Accounting */
s0->last_heard = now;
}
/* Hairpinning */
- snat_hairpinning (sm, b1, ip1, udp1, tcp1, proto1);
+ if (!is_output_feature)
+ snat_hairpinning (sm, b1, ip1, udp1, tcp1, proto1);
/* Accounting */
s1->last_heard = now;
}
/* Hairpinning */
- snat_hairpinning (sm, b0, ip0, udp0, tcp0, proto0);
+ if (!is_output_feature)
+ snat_hairpinning (sm, b0, ip0, udp0, tcp0, proto0);
/* Accounting */
s0->last_heard = now;
VLIB_NODE_FUNCTION_MULTIARCH (snat_in2out_output_worker_handoff_node,
snat_in2out_output_worker_handoff_fn);
+static_always_inline int
+is_hairpinning (snat_main_t *sm, ip4_address_t * dst_addr)
+{
+ snat_address_t * ap;
+ clib_bihash_kv_8_8_t kv, value;
+ snat_session_key_t m_key;
+
+ vec_foreach (ap, sm->addresses)
+ {
+ if (ap->addr.as_u32 == dst_addr->as_u32)
+ return 1;
+ }
+
+ m_key.addr.as_u32 = dst_addr->as_u32;
+ m_key.fib_index = sm->outside_fib_index;
+ m_key.port = 0;
+ m_key.protocol = 0;
+ kv.key = m_key.as_u64;
+ if (!clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value))
+ return 1;
+
+ return 0;
+}
+
+static uword
+snat_hairpin_dst_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ u32 n_left_from, * from, * to_next;
+ snat_in2out_next_t next_index;
+ u32 pkts_processed = 0;
+ snat_main_t * sm = &snat_main;
+
+ from = vlib_frame_vector_args (frame);
+ n_left_from = frame->n_vectors;
+ next_index = node->cached_next_index;
+
+ while (n_left_from > 0)
+ {
+ u32 n_left_to_next;
+
+ 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;
+ vlib_buffer_t * b0;
+ u32 next0;
+ ip4_header_t * ip0;
+ u32 proto0;
+
+ /* speculatively enqueue b0 to the current next frame */
+ bi0 = from[0];
+ to_next[0] = bi0;
+ from += 1;
+ to_next += 1;
+ n_left_from -= 1;
+ n_left_to_next -= 1;
+
+ b0 = vlib_get_buffer (vm, bi0);
+ next0 = SNAT_IN2OUT_NEXT_LOOKUP;
+ ip0 = vlib_buffer_get_current (b0);
+
+ proto0 = ip_proto_to_snat_proto (ip0->protocol);
+
+ vnet_buffer (b0)->snat.flags = 0;
+ if (PREDICT_FALSE (is_hairpinning (sm, &ip0->dst_address)))
+ {
+ if (proto0 == SNAT_PROTOCOL_TCP || proto0 == SNAT_PROTOCOL_UDP)
+ {
+ udp_header_t * udp0 = ip4_next_header (ip0);
+ tcp_header_t * tcp0 = (tcp_header_t *) udp0;
+
+ snat_hairpinning (sm, b0, ip0, udp0, tcp0, proto0);
+ }
+ else if (proto0 == SNAT_PROTOCOL_ICMP)
+ {
+ icmp46_header_t * icmp0 = ip4_next_header (ip0);
+
+ snat_icmp_hairpinning (sm, b0, ip0, icmp0);
+ }
+ else
+ {
+ snat_hairpinning_unknown_proto (sm, b0, ip0);
+ }
+
+ vnet_buffer (b0)->snat.flags = SNAT_FLAG_HAIRPINNING;
+ clib_warning("is hairpinning");
+ }
+
+ pkts_processed += next0 != SNAT_IN2OUT_NEXT_DROP;
+
+ /* verify speculative enqueue, maybe switch current next frame */
+ vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, next0);
+ }
+
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ }
+
+ vlib_node_increment_counter (vm, snat_hairpin_dst_node.index,
+ SNAT_IN2OUT_ERROR_IN2OUT_PACKETS,
+ pkts_processed);
+ return frame->n_vectors;
+}
+
+VLIB_REGISTER_NODE (snat_hairpin_dst_node) = {
+ .function = snat_hairpin_dst_fn,
+ .name = "snat-hairpin-dst",
+ .vector_size = sizeof (u32),
+ .type = VLIB_NODE_TYPE_INTERNAL,
+ .n_errors = ARRAY_LEN(snat_in2out_error_strings),
+ .error_strings = snat_in2out_error_strings,
+ .n_next_nodes = 2,
+ .next_nodes = {
+ [SNAT_IN2OUT_NEXT_DROP] = "error-drop",
+ [SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup",
+ },
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (snat_hairpin_dst_node,
+ snat_hairpin_dst_fn);
+
+static uword
+snat_hairpin_src_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ u32 n_left_from, * from, * to_next;
+ snat_in2out_next_t next_index;
+ u32 pkts_processed = 0;
+ snat_main_t *sm = &snat_main;
+
+ from = vlib_frame_vector_args (frame);
+ n_left_from = frame->n_vectors;
+ next_index = node->cached_next_index;
+
+ while (n_left_from > 0)
+ {
+ u32 n_left_to_next;
+
+ 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;
+ vlib_buffer_t * b0;
+ u32 next0;
+
+ /* speculatively enqueue b0 to the current next frame */
+ bi0 = from[0];
+ to_next[0] = bi0;
+ from += 1;
+ to_next += 1;
+ n_left_from -= 1;
+ n_left_to_next -= 1;
+
+ b0 = vlib_get_buffer (vm, bi0);
+ next0 = SNAT_HAIRPIN_SRC_NEXT_INTERFACE_OUTPUT;
+
+ if (PREDICT_FALSE ((vnet_buffer (b0)->snat.flags) & SNAT_FLAG_HAIRPINNING))
+ {
+ if (PREDICT_TRUE (sm->num_workers > 1))
+ next0 = SNAT_HAIRPIN_SRC_NEXT_SNAT_IN2OUT_WH;
+ else
+ next0 = SNAT_HAIRPIN_SRC_NEXT_SNAT_IN2OUT;
+ }
+
+ pkts_processed += next0 != SNAT_IN2OUT_NEXT_DROP;
+
+ /* verify speculative enqueue, maybe switch current next frame */
+ vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, next0);
+ }
+
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ }
+
+ vlib_node_increment_counter (vm, snat_hairpin_src_node.index,
+ SNAT_IN2OUT_ERROR_IN2OUT_PACKETS,
+ pkts_processed);
+ return frame->n_vectors;
+}
+
+VLIB_REGISTER_NODE (snat_hairpin_src_node) = {
+ .function = snat_hairpin_src_fn,
+ .name = "snat-hairpin-src",
+ .vector_size = sizeof (u32),
+ .type = VLIB_NODE_TYPE_INTERNAL,
+ .n_errors = ARRAY_LEN(snat_in2out_error_strings),
+ .error_strings = snat_in2out_error_strings,
+ .n_next_nodes = SNAT_HAIRPIN_SRC_N_NEXT,
+ .next_nodes = {
+ [SNAT_HAIRPIN_SRC_NEXT_DROP] = "error-drop",
+ [SNAT_HAIRPIN_SRC_NEXT_SNAT_IN2OUT] = "snat-in2out-output",
+ [SNAT_HAIRPIN_SRC_NEXT_INTERFACE_OUTPUT] = "interface-output",
+ [SNAT_HAIRPIN_SRC_NEXT_SNAT_IN2OUT_WH] = "snat-in2out-output-worker-handoff",
+ },
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (snat_hairpin_src_node,
+ snat_hairpin_src_fn);
+
static uword
snat_in2out_fast_static_map_fn (vlib_main_t * vm,
vlib_node_runtime_t * node,
Code Review / vpp.git / commitdiff