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-rw-r--r--src/plugins/nat.am1
-rwxr-xr-xsrc/plugins/nat/in2out.c417
-rw-r--r--src/plugins/nat/nat.api81
-rw-r--r--src/plugins/nat/nat.c8
-rw-r--r--src/plugins/nat/nat.h32
-rw-r--r--src/plugins/nat/nat64_db.c46
-rw-r--r--src/plugins/nat/nat64_db.h21
-rw-r--r--src/plugins/nat/nat64_in2out.c505
-rw-r--r--src/plugins/nat/nat64_out2in.c409
-rw-r--r--src/plugins/nat/nat_api.c144
-rw-r--r--src/plugins/nat/nat_reass.c739
-rw-r--r--src/plugins/nat/nat_reass.h293
-rwxr-xr-xsrc/plugins/nat/out2in.c336
13 files changed, 2999 insertions, 33 deletions
diff --git a/src/plugins/nat.am b/src/plugins/nat.am
index add82f081c9..b6c369fe324 100644
--- a/src/plugins/nat.am
+++ b/src/plugins/nat.am
@@ -22,6 +22,7 @@ nat_plugin_la_SOURCES = nat/nat.c \
nat/nat_plugin.api.h \
nat/nat_ipfix_logging.c \
nat/nat_det.c \
+ nat/nat_reass.c \
nat/nat64.c \
nat/nat64_cli.c \
nat/nat64_in2out.c \
diff --git a/src/plugins/nat/in2out.c b/src/plugins/nat/in2out.c
index b0593900a93..e4dbe917ce8 100755
--- a/src/plugins/nat/in2out.c
+++ b/src/plugins/nat/in2out.c
@@ -24,6 +24,7 @@
#include <nat/nat.h>
#include <nat/nat_ipfix_logging.h>
#include <nat/nat_det.h>
+#include <nat/nat_reass.h>
#include <vppinfra/hash.h>
#include <vppinfra/error.h>
@@ -83,6 +84,25 @@ static u8 * format_snat_in2out_worker_handoff_trace (u8 * s, va_list * args)
return s;
}
+typedef struct {
+ u32 sw_if_index;
+ u32 next_index;
+ u8 cached;
+} nat44_in2out_reass_trace_t;
+
+static u8 * format_nat44_in2out_reass_trace (u8 * s, va_list * args)
+{
+ CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
+ CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
+ nat44_in2out_reass_trace_t * t = va_arg (*args, nat44_in2out_reass_trace_t *);
+
+ s = format (s, "NAT44_IN2OUT_REASS: sw_if_index %d, next index %d, status %s",
+ t->sw_if_index, t->next_index,
+ t->cached ? "cached" : "translated");
+
+ return s;
+}
+
vlib_node_registration_t snat_in2out_node;
vlib_node_registration_t snat_in2out_slowpath_node;
vlib_node_registration_t snat_in2out_fast_node;
@@ -94,6 +114,7 @@ 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;
vlib_node_registration_t nat44_hairpinning_node;
+vlib_node_registration_t nat44_in2out_reass_node;
#define foreach_snat_in2out_error \
@@ -103,7 +124,10 @@ _(OUT_OF_PORTS, "Out of ports") \
_(BAD_OUTSIDE_FIB, "Outside VRF ID not found") \
_(BAD_ICMP_TYPE, "unsupported ICMP type") \
_(NO_TRANSLATION, "No translation") \
-_(MAX_SESSIONS_EXCEEDED, "Maximum sessions exceeded")
+_(MAX_SESSIONS_EXCEEDED, "Maximum sessions exceeded") \
+_(DROP_FRAGMENT, "Drop fragment") \
+_(MAX_REASS, "Maximum reassemblies exceeded") \
+_(MAX_FRAG, "Maximum fragments per reassembly exceeded")
typedef enum {
#define _(sym,str) SNAT_IN2OUT_ERROR_##sym,
@@ -123,6 +147,7 @@ typedef enum {
SNAT_IN2OUT_NEXT_DROP,
SNAT_IN2OUT_NEXT_ICMP_ERROR,
SNAT_IN2OUT_NEXT_SLOW_PATH,
+ SNAT_IN2OUT_NEXT_REASS,
SNAT_IN2OUT_N_NEXT,
} snat_in2out_next_t;
@@ -243,6 +268,7 @@ static u32 slow_path (snat_main_t *sm, vlib_buffer_t *b0,
u32 address_index = ~0;
u32 outside_fib_index;
uword * p;
+ udp_header_t * udp0 = ip4_next_header (ip0);
if (PREDICT_FALSE (maximum_sessions_exceeded(sm, thread_index)))
{
@@ -443,6 +469,7 @@ static u32 slow_path (snat_main_t *sm, vlib_buffer_t *b0,
s->out2in.protocol = key0->protocol;
s->out2in.fib_index = outside_fib_index;
s->ext_host_addr.as_u32 = ip0->dst_address.as_u32;
+ s->ext_host_port = udp0->dst_port;
*sessionp = s;
/* Add to translation hashes */
@@ -1645,6 +1672,12 @@ snat_in2out_node_fn_inline (vlib_main_t * vm,
next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
goto trace00;
}
+
+ if (ip4_is_fragment (ip0))
+ {
+ next0 = SNAT_IN2OUT_NEXT_REASS;
+ goto trace00;
+ }
}
key0.addr = ip0->src_address;
@@ -1819,6 +1852,12 @@ snat_in2out_node_fn_inline (vlib_main_t * vm,
next1 = SNAT_IN2OUT_NEXT_SLOW_PATH;
goto trace01;
}
+
+ if (ip4_is_fragment (ip1))
+ {
+ next0 = SNAT_IN2OUT_NEXT_REASS;
+ goto trace01;
+ }
}
b1->flags |= VNET_BUFFER_F_IS_NATED;
@@ -2029,6 +2068,12 @@ snat_in2out_node_fn_inline (vlib_main_t * vm,
next0 = SNAT_IN2OUT_NEXT_SLOW_PATH;
goto trace0;
}
+
+ if (ip4_is_fragment (ip0))
+ {
+ next0 = SNAT_IN2OUT_NEXT_REASS;
+ goto trace0;
+ }
}
key0.addr = ip0->src_address;
@@ -2194,6 +2239,7 @@ VLIB_REGISTER_NODE (snat_in2out_node) = {
[SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup",
[SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-slowpath",
[SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
+ [SNAT_IN2OUT_NEXT_REASS] = "nat44-in2out-reass",
},
};
@@ -2227,6 +2273,7 @@ VLIB_REGISTER_NODE (snat_in2out_output_node) = {
[SNAT_IN2OUT_NEXT_LOOKUP] = "interface-output",
[SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-output-slowpath",
[SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
+ [SNAT_IN2OUT_NEXT_REASS] = "nat44-in2out-reass",
},
};
@@ -2261,6 +2308,7 @@ VLIB_REGISTER_NODE (snat_in2out_slowpath_node) = {
[SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup",
[SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-slowpath",
[SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
+ [SNAT_IN2OUT_NEXT_REASS] = "nat44-in2out-reass",
},
};
@@ -2295,6 +2343,7 @@ VLIB_REGISTER_NODE (snat_in2out_output_slowpath_node) = {
[SNAT_IN2OUT_NEXT_LOOKUP] = "interface-output",
[SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-output-slowpath",
[SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
+ [SNAT_IN2OUT_NEXT_REASS] = "nat44-in2out-reass",
},
};
@@ -2392,6 +2441,371 @@ VLIB_REGISTER_NODE (nat44_hairpinning_node) = {
VLIB_NODE_FUNCTION_MULTIARCH (nat44_hairpinning_node,
nat44_hairpinning_fn);
+static inline void
+nat44_reass_hairpinning (snat_main_t *sm,
+ vlib_buffer_t * b0,
+ ip4_header_t * ip0,
+ u16 sport,
+ u16 dport,
+ u32 proto0)
+{
+ snat_session_key_t key0, sm0;
+ snat_session_t * s0;
+ clib_bihash_kv_8_8_t kv0, value0;
+ ip_csum_t sum0;
+ u32 new_dst_addr0 = 0, old_dst_addr0, ti = 0, si;
+ u16 new_dst_port0, old_dst_port0;
+ udp_header_t * udp0;
+ tcp_header_t * tcp0;
+
+ key0.addr = ip0->dst_address;
+ key0.port = dport;
+ key0.protocol = proto0;
+ key0.fib_index = sm->outside_fib_index;
+ kv0.key = key0.as_u64;
+
+ udp0 = ip4_next_header (ip0);
+
+ /* Check if destination is static mappings */
+ if (!snat_static_mapping_match(sm, key0, &sm0, 1, 0))
+ {
+ new_dst_addr0 = sm0.addr.as_u32;
+ new_dst_port0 = sm0.port;
+ vnet_buffer(b0)->sw_if_index[VLIB_TX] = sm0.fib_index;
+ }
+ /* or active sessions */
+ else
+ {
+ if (sm->num_workers > 1)
+ ti = (clib_net_to_host_u16 (udp0->dst_port) - 1024) / sm->port_per_thread;
+ else
+ ti = sm->num_workers;
+
+ if (!clib_bihash_search_8_8 (&sm->per_thread_data[ti].out2in, &kv0, &value0))
+ {
+ si = value0.value;
+ s0 = pool_elt_at_index (sm->per_thread_data[ti].sessions, si);
+ new_dst_addr0 = s0->in2out.addr.as_u32;
+ new_dst_port0 = s0->in2out.port;
+ vnet_buffer(b0)->sw_if_index[VLIB_TX] = s0->in2out.fib_index;
+ }
+ }
+
+ /* 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);
+
+ old_dst_port0 = dport;
+ if (PREDICT_TRUE(new_dst_port0 != old_dst_port0 &&
+ ip4_is_first_fragment (ip0)))
+ {
+ if (PREDICT_TRUE(proto0 == SNAT_PROTOCOL_TCP))
+ {
+ tcp0 = ip4_next_header (ip0);
+ tcp0->dst = new_dst_port0;
+ sum0 = tcp0->checksum;
+ sum0 = ip_csum_update (sum0, old_dst_addr0, new_dst_addr0,
+ ip4_header_t, dst_address);
+ sum0 = ip_csum_update (sum0, old_dst_port0, new_dst_port0,
+ ip4_header_t /* cheat */, length);
+ tcp0->checksum = ip_csum_fold(sum0);
+ }
+ else
+ {
+ udp0->dst_port = new_dst_port0;
+ udp0->checksum = 0;
+ }
+ }
+ else
+ {
+ if (PREDICT_TRUE(proto0 == SNAT_PROTOCOL_TCP))
+ {
+ tcp0 = ip4_next_header (ip0);
+ sum0 = tcp0->checksum;
+ sum0 = ip_csum_update (sum0, old_dst_addr0, new_dst_addr0,
+ ip4_header_t, dst_address);
+ tcp0->checksum = ip_csum_fold(sum0);
+ }
+ }
+ }
+}
+
+static uword
+nat44_in2out_reass_node_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;
+ f64 now = vlib_time_now (vm);
+ u32 thread_index = vlib_get_thread_index ();
+ snat_main_per_thread_data_t *per_thread_data =
+ &sm->per_thread_data[thread_index];
+ u32 *fragments_to_drop = 0;
+ u32 *fragments_to_loopback = 0;
+
+ 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, sw_if_index0, proto0, rx_fib_index0, new_addr0, old_addr0;
+ vlib_buffer_t *b0;
+ u32 next0;
+ u8 cached0 = 0;
+ ip4_header_t *ip0;
+ nat_reass_ip4_t *reass0;
+ udp_header_t * udp0;
+ tcp_header_t * tcp0;
+ snat_session_key_t key0;
+ clib_bihash_kv_8_8_t kv0, value0;
+ snat_session_t * s0 = 0;
+ u16 old_port0, new_port0;
+ ip_csum_t sum0;
+
+ /* 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;
+
+ sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
+ rx_fib_index0 = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
+ sw_if_index0);
+
+ if (PREDICT_FALSE (nat_reass_is_drop_frag(0)))
+ {
+ next0 = SNAT_IN2OUT_NEXT_DROP;
+ b0->error = node->errors[SNAT_IN2OUT_ERROR_DROP_FRAGMENT];
+ goto trace0;
+ }
+
+ ip0 = (ip4_header_t *) vlib_buffer_get_current (b0);
+ udp0 = ip4_next_header (ip0);
+ tcp0 = (tcp_header_t *) udp0;
+ proto0 = ip_proto_to_snat_proto (ip0->protocol);
+
+ reass0 = nat_ip4_reass_find_or_create (ip0->src_address,
+ ip0->dst_address,
+ ip0->fragment_id,
+ ip0->protocol,
+ 1,
+ &fragments_to_drop);
+
+ if (PREDICT_FALSE (!reass0))
+ {
+ next0 = SNAT_IN2OUT_NEXT_DROP;
+ b0->error = node->errors[SNAT_IN2OUT_ERROR_MAX_REASS];
+ goto trace0;
+ }
+
+ if (PREDICT_FALSE (ip4_is_first_fragment (ip0)))
+ {
+ key0.addr = ip0->src_address;
+ key0.port = udp0->src_port;
+ key0.protocol = proto0;
+ key0.fib_index = rx_fib_index0;
+ kv0.key = key0.as_u64;
+
+ if (clib_bihash_search_8_8 (&per_thread_data->in2out, &kv0, &value0))
+ {
+ if (PREDICT_FALSE(snat_not_translate(sm, node, sw_if_index0,
+ ip0, proto0, rx_fib_index0, thread_index)))
+ goto trace0;
+
+ next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0,
+ &s0, node, next0, thread_index);
+
+ if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP))
+ goto trace0;
+
+ reass0->sess_index = s0 - per_thread_data->sessions;
+ }
+ else
+ {
+ s0 = pool_elt_at_index (per_thread_data->sessions,
+ value0.value);
+ reass0->sess_index = value0.value;
+ }
+ nat_ip4_reass_get_frags (reass0, &fragments_to_loopback);
+ }
+ else
+ {
+ if (PREDICT_FALSE (reass0->sess_index == (u32) ~0))
+ {
+ if (nat_ip4_reass_add_fragment (reass0, bi0))
+ {
+ b0->error = node->errors[SNAT_IN2OUT_ERROR_MAX_FRAG];
+ next0 = SNAT_IN2OUT_NEXT_DROP;
+ goto trace0;
+ }
+ cached0 = 1;
+ goto trace0;
+ }
+ s0 = pool_elt_at_index (per_thread_data->sessions,
+ reass0->sess_index);
+ }
+
+ old_addr0 = ip0->src_address.as_u32;
+ ip0->src_address = s0->out2in.addr;
+ new_addr0 = ip0->src_address.as_u32;
+ vnet_buffer(b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index;
+
+ sum0 = ip0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
+ ip4_header_t,
+ src_address /* changed member */);
+ ip0->checksum = ip_csum_fold (sum0);
+
+ if (PREDICT_FALSE (ip4_is_first_fragment (ip0)))
+ {
+ if (PREDICT_TRUE(proto0 == SNAT_PROTOCOL_TCP))
+ {
+ old_port0 = tcp0->src_port;
+ tcp0->src_port = s0->out2in.port;
+ new_port0 = tcp0->src_port;
+
+ sum0 = tcp0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
+ ip4_header_t,
+ dst_address /* changed member */);
+ sum0 = ip_csum_update (sum0, old_port0, new_port0,
+ ip4_header_t /* cheat */,
+ length /* changed member */);
+ tcp0->checksum = ip_csum_fold(sum0);
+ }
+ else
+ {
+ old_port0 = udp0->src_port;
+ udp0->src_port = s0->out2in.port;
+ udp0->checksum = 0;
+ }
+ }
+
+ /* Hairpinning */
+ nat44_reass_hairpinning (sm, b0, ip0, s0->out2in.port,
+ s0->ext_host_port, proto0);
+
+ /* Accounting */
+ s0->last_heard = now;
+ s0->total_pkts++;
+ s0->total_bytes += vlib_buffer_length_in_chain (vm, b0);
+ /* Per-user LRU list maintenance for dynamic translation */
+ if (!snat_is_session_static (s0))
+ {
+ clib_dlist_remove (sm->per_thread_data[thread_index].list_pool,
+ s0->per_user_index);
+ clib_dlist_addtail (sm->per_thread_data[thread_index].list_pool,
+ s0->per_user_list_head_index,
+ s0->per_user_index);
+ }
+
+ trace0:
+ if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
+ && (b0->flags & VLIB_BUFFER_IS_TRACED)))
+ {
+ nat44_in2out_reass_trace_t *t =
+ vlib_add_trace (vm, node, b0, sizeof (*t));
+ t->cached = cached0;
+ t->sw_if_index = sw_if_index0;
+ t->next_index = next0;
+ }
+
+ if (cached0)
+ {
+ n_left_to_next++;
+ to_next--;
+ }
+ else
+ {
+ 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);
+ }
+
+ if (n_left_from == 0 && vec_len (fragments_to_loopback))
+ {
+ from = vlib_frame_vector_args (frame);
+ u32 len = vec_len (fragments_to_loopback);
+ if (len <= VLIB_FRAME_SIZE)
+ {
+ clib_memcpy (from, fragments_to_loopback, sizeof (u32) * len);
+ n_left_from = len;
+ vec_reset_length (fragments_to_loopback);
+ }
+ else
+ {
+ clib_memcpy (from,
+ fragments_to_loopback + (len - VLIB_FRAME_SIZE),
+ sizeof (u32) * VLIB_FRAME_SIZE);
+ n_left_from = VLIB_FRAME_SIZE;
+ _vec_len (fragments_to_loopback) = len - VLIB_FRAME_SIZE;
+ }
+ }
+ }
+
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ }
+
+ vlib_node_increment_counter (vm, nat44_in2out_reass_node.index,
+ SNAT_IN2OUT_ERROR_IN2OUT_PACKETS,
+ pkts_processed);
+
+ nat_send_all_to_node (vm, fragments_to_drop, node,
+ &node->errors[SNAT_IN2OUT_ERROR_DROP_FRAGMENT],
+ SNAT_IN2OUT_NEXT_DROP);
+
+ vec_free (fragments_to_drop);
+ vec_free (fragments_to_loopback);
+ return frame->n_vectors;
+}
+
+VLIB_REGISTER_NODE (nat44_in2out_reass_node) = {
+ .function = nat44_in2out_reass_node_fn,
+ .name = "nat44-in2out-reass",
+ .vector_size = sizeof (u32),
+ .format_trace = format_nat44_in2out_reass_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+
+ .n_errors = ARRAY_LEN(snat_in2out_error_strings),
+ .error_strings = snat_in2out_error_strings,
+
+ .n_next_nodes = SNAT_IN2OUT_N_NEXT,
+ .next_nodes = {
+ [SNAT_IN2OUT_NEXT_DROP] = "error-drop",
+ [SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup",
+ [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-slowpath",
+ [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
+ [SNAT_IN2OUT_NEXT_REASS] = "nat44-in2out-reass",
+ },
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (nat44_in2out_reass_node,
+ nat44_in2out_reass_node_fn);
+
/**************************/
/*** deterministic mode ***/
/**************************/
@@ -3771,6 +4185,7 @@ VLIB_REGISTER_NODE (snat_in2out_fast_node) = {
[SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup",
[SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-slowpath",
[SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error",
+ [SNAT_IN2OUT_NEXT_REASS] = "nat44-in2out-reass",
},
};
diff --git a/src/plugins/nat/nat.api b/src/plugins/nat/nat.api
index 187de25c8c1..d8fdf7283cf 100644
--- a/src/plugins/nat/nat.api
+++ b/src/plugins/nat/nat.api
@@ -760,6 +760,87 @@ autoreply define nat_ipfix_enable_disable {
u8 enable;
};
+/** \brief Set NAT virtual fragmentation reassembly
+ @param client_index - opaque cookie to identify the sender
+ @param context - sender context, to match reply w/ request
+ @param timeout - reassembly timeout
+ @param max_reass - maximum number of concurrent reassemblies
+ @param max_frag - maximum number of fragmets per reassembly
+ @param drop_frag - if 0 translate fragments, otherwise drop fragments
+ @param is_ip6 - 1 if IPv6, 0 if IPv4
+*/
+autoreply define nat_set_reass {
+ u32 client_index;
+ u32 context;
+ u32 timeout;
+ u16 max_reass;
+ u8 max_frag;
+ u8 drop_frag;
+ u8 is_ip6;
+};
+
+/** \brief Get NAT virtual fragmentation reassembly configuration
+ @param client_index - opaque cookie to identify the sender
+ @param context - sender context, to match reply w/ request
+*/
+define nat_get_reass {
+ u32 client_index;
+ u32 context;
+};
+
+/** \brief Get NAT virtual fragmentation reassembly configuration reply
+ @param context - sender context, to match reply w/ request
+ @param retval - return code
+ @param ip4_timeout - reassembly timeout
+ @param ip4_max_reass - maximum number of concurrent reassemblies
+ @param ip4_max_frag - maximum number of fragmets per reassembly
+ @param ip4_drop_frag - if 0 translate fragments, otherwise drop fragments
+ @param ip6_timeout - reassembly timeout
+ @param ip6_max_reass - maximum number of concurrent reassemblies
+ @param ip6_max_frag - maximum number of fragmets per reassembly
+ @param ip6_drop_frag - if 0 translate fragments, otherwise drop fragments
+*/
+define nat_get_reass_reply {
+ u32 context;
+ i32 retval;
+ u32 ip4_timeout;
+ u16 ip4_max_reass;
+ u8 ip4_max_frag;
+ u8 ip4_drop_frag;
+ u32 ip6_timeout;
+ u16 ip6_max_reass;
+ u8 ip6_max_frag;
+ u8 ip6_drop_frag;
+};
+
+/** \brief Dump NAT virtual fragmentation reassemblies
+ @param client_index - opaque cookie to identify the sender
+ @param context - sender context, to match reply w/ request
+*/
+define nat_reass_dump {
+ u32 client_index;
+ u32 context;
+};
+
+/** \brief NAT virtual fragmentation reassemblies response
+ @param context - sender context, to match reply w/ request
+ @param is_ip4 - 1 if address type is IPv4
+ @param src_addr - source IP address
+ @param dst_addr - destination IP address
+ @param frag_id - fragment ID
+ @param proto - protocol
+ @param frag_n - number of cached fragments
+*/
+define nat_reass_details {
+ u32 context;
+ u8 is_ip4;
+ u8 src_addr[16];
+ u8 dst_addr[16];
+ u32 frag_id;
+ u8 proto;
+ u8 frag_n;
+};
+
/*
* NAT44 APIs
*/
diff --git a/src/plugins/nat/nat.c b/src/plugins/nat/nat.c
index cd5a6eb8fa8..7e651e5e9e5 100644
--- a/src/plugins/nat/nat.c
+++ b/src/plugins/nat/nat.c
@@ -24,6 +24,7 @@
#include <nat/nat_det.h>
#include <nat/nat64.h>
#include <nat/dslite.h>
+#include <nat/nat_reass.h>
#include <vnet/fib/fib_table.h>
#include <vnet/fib/ip4_fib.h>
@@ -1447,11 +1448,15 @@ static clib_error_t * snat_init (vlib_main_t * vm)
/* Init IPFIX logging */
snat_ipfix_logging_init(vm);
+ /* Init NAT64 */
error = nat64_init(vm);
+ if (error)
+ return error;
dslite_init(vm);
- return error;
+ /* Init virtual fragmenentation reassembly */
+ return nat_reass_init(vm);
}
VLIB_INIT_FUNCTION (snat_init);
@@ -2889,6 +2894,7 @@ show_snat_command_fn (vlib_main_t * vm,
}
}
}
+
return 0;
}
diff --git a/src/plugins/nat/nat.h b/src/plugins/nat/nat.h
index b72e075df35..5bd0a119f38 100644
--- a/src/plugins/nat/nat.h
+++ b/src/plugins/nat/nat.h
@@ -154,9 +154,9 @@ typedef CLIB_PACKED(struct {
/* Outside address */
u32 outside_address_index; /* 64-67 */
- /* External host address */
+ /* External host address and port */
ip4_address_t ext_host_addr; /* 68-71 */
-
+ u16 ext_host_port; /* 72-73 */
}) snat_session_t;
@@ -563,4 +563,30 @@ maximum_sessions_exceeded (snat_main_t *sm, u32 thread_index)
return 0;
}
-#endif /* __included_nat_h__ */
+static_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);
+ }
+}
+
+#endif /* __included_snat_h__ */
diff --git a/src/plugins/nat/nat64_db.c b/src/plugins/nat/nat64_db.c
index da73ceee2d1..008a137da10 100644
--- a/src/plugins/nat/nat64_db.c
+++ b/src/plugins/nat/nat64_db.c
@@ -529,6 +529,52 @@ nat64_db_st_entry_find (nat64_db_t * db, ip46_address_t * l_addr,
return ste;
}
+u32
+nat64_db_st_entry_get_index (nat64_db_t * db, nat64_db_st_entry_t * ste)
+{
+ nat64_db_st_entry_t *st;
+
+ switch (ip_proto_to_snat_proto (ste->proto))
+ {
+/* *INDENT-OFF* */
+#define _(N, i, n, s) \
+ case SNAT_PROTOCOL_##N: \
+ st = db->st._##n##_st; \
+ break;
+ foreach_snat_protocol
+#undef _
+/* *INDENT-ON* */
+ default:
+ st = db->st._unk_proto_st;
+ return (u32) ~ 0;
+ }
+
+ return ste - st;
+}
+
+nat64_db_st_entry_t *
+nat64_db_st_entry_by_index (nat64_db_t * db, u8 proto, u32 ste_index)
+{
+ nat64_db_st_entry_t *st;
+
+ switch (ip_proto_to_snat_proto (proto))
+ {
+/* *INDENT-OFF* */
+#define _(N, i, n, s) \
+ case SNAT_PROTOCOL_##N: \
+ st = db->st._##n##_st; \
+ break;
+ foreach_snat_protocol
+#undef _
+/* *INDENT-ON* */
+ default:
+ st = db->st._unk_proto_st;
+ break;
+ }
+
+ return pool_elt_at_index (st, ste_index);
+}
+
void
nad64_db_st_free_expired (nat64_db_t * db, u32 now)
{
diff --git a/src/plugins/nat/nat64_db.h b/src/plugins/nat/nat64_db.h
index 394ca875bbb..94d9a8bdebf 100644
--- a/src/plugins/nat/nat64_db.h
+++ b/src/plugins/nat/nat64_db.h
@@ -296,6 +296,27 @@ void nad64_db_st_free_expired (nat64_db_t * db, u32 now);
*/
void nat64_db_free_out_addr (nat64_db_t * db, ip4_address_t * out_addr);
+/*
+ * @brief Get ST entry index.
+ *
+ * @param db NAT64 DB.
+ * @param ste ST entry.
+ *
+ * @return ST entry index on success, ~0 otherwise.
+ */
+u32 nat64_db_st_entry_get_index (nat64_db_t * db, nat64_db_st_entry_t * ste);
+
+/**
+ * @brief Get ST entry by index and protocol.
+ *
+ * @param db NAT64 DB.
+ * @param proto L4 protocol.
+ * @param bibe_index ST entry index.
+ *
+ * @return BIB entry if found.
+ */
+nat64_db_st_entry_t *nat64_db_st_entry_by_index (nat64_db_t * db,
+ u8 proto, u32 ste_index);
#endif /* __included_nat64_db_h__ */
/*
diff --git a/src/plugins/nat/nat64_in2out.c b/src/plugins/nat/nat64_in2out.c
index f78baff4e12..4f94575ebcc 100644
--- a/src/plugins/nat/nat64_in2out.c
+++ b/src/plugins/nat/nat64_in2out.c
@@ -18,6 +18,7 @@
*/
#include <nat/nat64.h>
+#include <nat/nat_reass.h>
#include <vnet/ip/ip6_to_ip4.h>
#include <vnet/fib/fib_table.h>
@@ -45,14 +46,42 @@ format_nat64_in2out_trace (u8 * s, va_list * args)
return s;
}
+typedef struct
+{
+ u32 sw_if_index;
+ u32 next_index;
+ u8 cached;
+} nat64_in2out_reass_trace_t;
+
+static u8 *
+format_nat64_in2out_reass_trace (u8 * s, va_list * args)
+{
+ CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
+ CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
+ nat64_in2out_reass_trace_t *t =
+ va_arg (*args, nat64_in2out_reass_trace_t *);
+
+ s =
+ format (s, "NAT64-in2out-reass: sw_if_index %d, next index %d, status %s",
+ t->sw_if_index, t->next_index,
+ t->cached ? "cached" : "translated");
+
+ return s;
+}
+
vlib_node_registration_t nat64_in2out_node;
vlib_node_registration_t nat64_in2out_slowpath_node;
+vlib_node_registration_t nat64_in2out_reass_node;
+
+#define foreach_nat64_in2out_error \
+_(UNSUPPORTED_PROTOCOL, "unsupported protocol") \
+_(IN2OUT_PACKETS, "good in2out packets processed") \
+_(NO_TRANSLATION, "no translation") \
+_(UNKNOWN, "unknown") \
+_(DROP_FRAGMENT, "Drop fragment") \
+_(MAX_REASS, "Maximum reassemblies exceeded") \
+_(MAX_FRAG, "Maximum fragments per reassembly exceeded")
-#define foreach_nat64_in2out_error \
-_(UNSUPPORTED_PROTOCOL, "unsupported protocol") \
-_(IN2OUT_PACKETS, "good in2out packets processed") \
-_(NO_TRANSLATION, "no translation") \
-_(UNKNOWN, "unknown")
typedef enum
{
@@ -74,6 +103,7 @@ typedef enum
NAT64_IN2OUT_NEXT_IP6_LOOKUP,
NAT64_IN2OUT_NEXT_DROP,
NAT64_IN2OUT_NEXT_SLOWPATH,
+ NAT64_IN2OUT_NEXT_REASS,
NAT64_IN2OUT_N_NEXT,
} nat64_in2out_next_t;
@@ -936,13 +966,6 @@ nat64_in2out_node_fn_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
}
proto0 = ip_proto_to_snat_proto (l4_protocol0);
- if (frag_offset0 != 0)
- {
- next0 = NAT64_IN2OUT_NEXT_DROP;
- b0->error =
- node->errors[NAT64_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL];
- goto trace0;
- }
if (is_slow_path)
{
@@ -979,6 +1002,13 @@ nat64_in2out_node_fn_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
}
}
+ if (PREDICT_FALSE
+ (ip60->protocol == IP_PROTOCOL_IPV6_FRAGMENTATION))
+ {
+ next0 = NAT64_IN2OUT_NEXT_REASS;
+ goto trace0;
+ }
+
if (proto0 == SNAT_PROTOCOL_ICMP)
{
if (is_hairpinning (&ip60->dst_address))
@@ -1073,6 +1103,7 @@ VLIB_REGISTER_NODE (nat64_in2out_node) = {
[NAT64_IN2OUT_NEXT_IP4_LOOKUP] = "ip4-lookup",
[NAT64_IN2OUT_NEXT_IP6_LOOKUP] = "ip6-lookup",
[NAT64_IN2OUT_NEXT_SLOWPATH] = "nat64-in2out-slowpath",
+ [NAT64_IN2OUT_NEXT_REASS] = "nat64-in2out-reass",
},
};
/* *INDENT-ON* */
@@ -1102,6 +1133,7 @@ VLIB_REGISTER_NODE (nat64_in2out_slowpath_node) = {
[NAT64_IN2OUT_NEXT_IP4_LOOKUP] = "ip4-lookup",
[NAT64_IN2OUT_NEXT_IP6_LOOKUP] = "ip6-lookup",
[NAT64_IN2OUT_NEXT_SLOWPATH] = "nat64-in2out-slowpath",
+ [NAT64_IN2OUT_NEXT_REASS] = "nat64-in2out-reass",
},
};
/* *INDENT-ON* */
@@ -1109,6 +1141,455 @@ VLIB_REGISTER_NODE (nat64_in2out_slowpath_node) = {
VLIB_NODE_FUNCTION_MULTIARCH (nat64_in2out_slowpath_node,
nat64_in2out_slowpath_node_fn);
+typedef struct nat64_in2out_frag_set_ctx_t_
+{
+ vlib_main_t *vm;
+ u32 sess_index;
+ u16 l4_offset;
+ u8 proto;
+ u8 first_frag;
+} nat64_in2out_frag_set_ctx_t;
+
+static int
+nat64_in2out_frag_set_cb (ip6_header_t * ip6, ip4_header_t * ip4, void *arg)
+{
+ nat64_main_t *nm = &nat64_main;
+ nat64_in2out_frag_set_ctx_t *ctx = arg;
+ nat64_db_st_entry_t *ste;
+ nat64_db_bib_entry_t *bibe;
+ udp_header_t *udp;
+
+ ste = nat64_db_st_entry_by_index (&nm->db, ctx->proto, ctx->sess_index);
+ if (!ste)
+ return -1;
+
+ bibe = nat64_db_bib_entry_by_index (&nm->db, ctx->proto, ste->bibe_index);
+ if (!bibe)
+ return -1;
+
+ nat64_session_reset_timeout (ste, ctx->vm);
+
+ if (ctx->first_frag)
+ {
+ udp = (udp_header_t *) u8_ptr_add (ip6, ctx->l4_offset);
+
+ if (ctx->proto == IP_PROTOCOL_TCP)
+ {
+ u16 *checksum;
+ ip_csum_t csum;
+ tcp_header_t *tcp = (tcp_header_t *) udp;
+
+ checksum = &tcp->checksum;
+ csum = ip_csum_sub_even (*checksum, tcp->src_port);
+ csum = ip_csum_sub_even (csum, ip6->src_address.as_u64[0]);
+ csum = ip_csum_sub_even (csum, ip6->src_address.as_u64[1]);
+ csum = ip_csum_sub_even (csum, ip6->dst_address.as_u64[0]);
+ csum = ip_csum_sub_even (csum, ip6->dst_address.as_u64[1]);
+ csum = ip_csum_add_even (csum, bibe->out_port);
+ csum = ip_csum_add_even (csum, bibe->out_addr.as_u32);
+ csum = ip_csum_add_even (csum, ste->out_r_addr.as_u32);
+ *checksum = ip_csum_fold (csum);
+ }
+
+ udp->src_port = bibe->out_port;
+ }
+
+ ip4->src_address.as_u32 = bibe->out_addr.as_u32;
+ ip4->dst_address.as_u32 = ste->out_r_addr.as_u32;
+
+ return 0;
+}
+
+static int
+nat64_in2out_frag_hairpinning (vlib_buffer_t * b, ip6_header_t * ip6,
+ nat64_in2out_frag_set_ctx_t * ctx)
+{
+ nat64_main_t *nm = &nat64_main;
+ nat64_db_st_entry_t *ste;
+ nat64_db_bib_entry_t *bibe;
+ udp_header_t *udp = (udp_header_t *) u8_ptr_add (ip6, ctx->l4_offset);
+ tcp_header_t *tcp = (tcp_header_t *) udp;
+ u16 sport = udp->src_port;
+ u16 dport = udp->dst_port;
+ u16 *checksum;
+ ip_csum_t csum;
+ ip46_address_t saddr, daddr;
+
+ if (ctx->first_frag)
+ {
+ if (ctx->proto == IP_PROTOCOL_UDP)
+ checksum = &udp->checksum;
+ else
+ checksum = &tcp->checksum;
+
+ csum = ip_csum_sub_even (*checksum, ip6->src_address.as_u64[0]);
+ csum = ip_csum_sub_even (csum, ip6->src_address.as_u64[1]);
+ csum = ip_csum_sub_even (csum, ip6->dst_address.as_u64[0]);
+ csum = ip_csum_sub_even (csum, ip6->dst_address.as_u64[1]);
+ csum = ip_csum_sub_even (csum, sport);
+ csum = ip_csum_sub_even (csum, dport);
+ }
+
+ ste = nat64_db_st_entry_by_index (&nm->db, ctx->proto, ctx->sess_index);
+ if (!ste)
+ return -1;
+
+ bibe = nat64_db_bib_entry_by_index (&nm->db, ctx->proto, ste->bibe_index);
+ if (!bibe)
+ return -1;
+
+ nat64_session_reset_timeout (ste, ctx->vm);
+
+ sport = bibe->out_port;
+ dport = ste->r_port;
+
+ nat64_compose_ip6 (&ip6->src_address, &bibe->out_addr, bibe->fib_index);
+
+ memset (&saddr, 0, sizeof (saddr));
+ memset (&daddr, 0, sizeof (daddr));
+ saddr.ip4.as_u32 = bibe->out_addr.as_u32;
+ daddr.ip4.as_u32 = ste->out_r_addr.as_u32;
+
+ ste =
+ nat64_db_st_entry_find (&nm->db, &daddr, &saddr, dport, sport, ctx->proto,
+ 0, 0);
+
+ if (ste)
+ {
+ bibe =
+ nat64_db_bib_entry_by_index (&nm->db, ctx->proto, ste->bibe_index);
+ if (!bibe)
+ return -1;
+ }
+ else
+ {
+ bibe =
+ nat64_db_bib_entry_find (&nm->db, &daddr, dport, ctx->proto, 0, 0);
+
+ if (!bibe)
+ return -1;
+
+ ste =
+ nat64_db_st_entry_create (&nm->db, bibe, &ip6->src_address,
+ &saddr.ip4, sport);
+ }
+
+ ip6->dst_address.as_u64[0] = bibe->in_addr.as_u64[0];
+ ip6->dst_address.as_u64[1] = bibe->in_addr.as_u64[1];
+
+ if (ctx->first_frag)
+ {
+ udp->dst_port = bibe->in_port;
+ udp->src_port = sport;
+ csum = ip_csum_add_even (csum, ip6->src_address.as_u64[0]);
+ csum = ip_csum_add_even (csum, ip6->src_address.as_u64[1]);
+ csum = ip_csum_add_even (csum, ip6->dst_address.as_u64[0]);
+ csum = ip_csum_add_even (csum, ip6->dst_address.as_u64[1]);
+ csum = ip_csum_add_even (csum, udp->src_port);
+ csum = ip_csum_add_even (csum, udp->dst_port);
+ *checksum = ip_csum_fold (csum);
+ }
+
+ return 0;
+}
+
+static uword
+nat64_in2out_reass_node_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+ u32 n_left_from, *from, *to_next;
+ nat64_in2out_next_t next_index;
+ u32 pkts_processed = 0;
+ u32 *fragments_to_drop = 0;
+ u32 *fragments_to_loopback = 0;
+ nat64_main_t *nm = &nat64_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;
+ u8 cached0 = 0;
+ ip6_header_t *ip60;
+ u16 l4_offset0, frag_offset0;
+ u8 l4_protocol0;
+ nat_reass_ip6_t *reass0;
+ ip6_frag_hdr_t *frag0;
+ nat64_db_bib_entry_t *bibe0;
+ nat64_db_st_entry_t *ste0;
+ udp_header_t *udp0;
+ snat_protocol_t proto0;
+ u32 sw_if_index0, fib_index0;
+ ip46_address_t saddr0, daddr0;
+ nat64_in2out_frag_set_ctx_t ctx0;
+
+ /* 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 = NAT64_IN2OUT_NEXT_IP4_LOOKUP;
+
+ sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
+ fib_index0 =
+ fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP6,
+ sw_if_index0);
+
+ if (PREDICT_FALSE (nat_reass_is_drop_frag (1)))
+ {
+ next0 = NAT64_IN2OUT_NEXT_DROP;
+ b0->error = node->errors[NAT64_IN2OUT_ERROR_DROP_FRAGMENT];
+ goto trace0;
+ }
+
+ ip60 = (ip6_header_t *) vlib_buffer_get_current (b0);
+
+ if (PREDICT_FALSE
+ (ip6_parse
+ (ip60, b0->current_length, &l4_protocol0, &l4_offset0,
+ &frag_offset0)))
+ {
+ next0 = NAT64_IN2OUT_NEXT_DROP;
+ b0->error = node->errors[NAT64_IN2OUT_ERROR_UNKNOWN];
+ goto trace0;
+ }
+
+ if (PREDICT_FALSE
+ (!(l4_protocol0 == IP_PROTOCOL_TCP
+ || l4_protocol0 == IP_PROTOCOL_UDP)))
+ {
+ next0 = NAT64_IN2OUT_NEXT_DROP;
+ b0->error = node->errors[NAT64_IN2OUT_ERROR_DROP_FRAGMENT];
+ goto trace0;
+ }
+
+ udp0 = (udp_header_t *) u8_ptr_add (ip60, l4_offset0);
+ frag0 = (ip6_frag_hdr_t *) u8_ptr_add (ip60, frag_offset0);
+ proto0 = ip_proto_to_snat_proto (l4_protocol0);
+
+ reass0 = nat_ip6_reass_find_or_create (ip60->src_address,
+ ip60->dst_address,
+ frag0->identification,
+ l4_protocol0,
+ 1, &fragments_to_drop);
+
+ if (PREDICT_FALSE (!reass0))
+ {
+ next0 = NAT64_IN2OUT_NEXT_DROP;
+ b0->error = node->errors[NAT64_IN2OUT_ERROR_MAX_REASS];
+ goto trace0;
+ }
+
+ if (PREDICT_TRUE (ip6_frag_hdr_offset (frag0)))
+ {
+ ctx0.first_frag = 0;
+ if (PREDICT_FALSE (reass0->sess_index == (u32) ~ 0))
+ {
+ if (nat_ip6_reass_add_fragment (reass0, bi0))
+ {
+ b0->error = node->errors[NAT64_IN2OUT_ERROR_MAX_FRAG];
+ next0 = NAT64_IN2OUT_NEXT_DROP;
+ goto trace0;
+ }
+ cached0 = 1;
+ goto trace0;
+ }
+ }
+ else
+ {
+ ctx0.first_frag = 1;
+
+ saddr0.as_u64[0] = ip60->src_address.as_u64[0];
+ saddr0.as_u64[1] = ip60->src_address.as_u64[1];
+ daddr0.as_u64[0] = ip60->dst_address.as_u64[0];
+ daddr0.as_u64[1] = ip60->dst_address.as_u64[1];
+
+ ste0 =
+ nat64_db_st_entry_find (&nm->db, &saddr0, &daddr0,
+ udp0->src_port, udp0->dst_port,
+ l4_protocol0, fib_index0, 1);
+ if (!ste0)
+ {
+ bibe0 =
+ nat64_db_bib_entry_find (&nm->db, &saddr0, udp0->src_port,
+ l4_protocol0, fib_index0, 1);
+ if (!bibe0)
+ {
+ u16 out_port0;
+ ip4_address_t out_addr0;
+ if (nat64_alloc_out_addr_and_port
+ (fib_index0, proto0, &out_addr0, &out_port0))
+ {
+ next0 = NAT64_IN2OUT_NEXT_DROP;
+ b0->error =
+ node->errors[NAT64_IN2OUT_ERROR_NO_TRANSLATION];
+ goto trace0;
+ }
+
+ bibe0 =
+ nat64_db_bib_entry_create (&nm->db,
+ &ip60->src_address,
+ &out_addr0, udp0->src_port,
+ clib_host_to_net_u16
+ (out_port0), fib_index0,
+ l4_protocol0, 0);
+ if (!bibe0)
+ {
+ next0 = NAT64_IN2OUT_NEXT_DROP;
+ b0->error =
+ node->errors[NAT64_IN2OUT_ERROR_NO_TRANSLATION];
+ goto trace0;
+ }
+ }
+ nat64_extract_ip4 (&ip60->dst_address, &daddr0.ip4,
+ fib_index0);
+ ste0 =
+ nat64_db_st_entry_create (&nm->db, bibe0,
+ &ip60->dst_address, &daddr0.ip4,
+ udp0->dst_port);
+ if (!ste0)
+ {
+ next0 = NAT64_IN2OUT_NEXT_DROP;
+ b0->error =
+ node->errors[NAT64_IN2OUT_ERROR_NO_TRANSLATION];
+ goto trace0;
+ }
+ }
+ reass0->sess_index =
+ nat64_db_st_entry_get_index (&nm->db, ste0);
+
+ nat_ip6_reass_get_frags (reass0, &fragments_to_loopback);
+ }
+
+ ctx0.sess_index = reass0->sess_index;
+ ctx0.proto = l4_protocol0;
+ ctx0.vm = vm;
+ ctx0.l4_offset = l4_offset0;
+
+ if (PREDICT_FALSE (is_hairpinning (&ip60->dst_address)))
+ {
+ next0 = NAT64_IN2OUT_NEXT_IP6_LOOKUP;
+ if (nat64_in2out_frag_hairpinning (b0, ip60, &ctx0))
+ {
+ next0 = NAT64_IN2OUT_NEXT_DROP;
+ b0->error = node->errors[NAT64_IN2OUT_ERROR_NO_TRANSLATION];
+ }
+ goto trace0;
+ }
+ else
+ {
+ if (ip6_to_ip4_fragmented (b0, nat64_in2out_frag_set_cb, &ctx0))
+ {
+ next0 = NAT64_IN2OUT_NEXT_DROP;
+ b0->error = node->errors[NAT64_IN2OUT_ERROR_UNKNOWN];
+ goto trace0;
+ }
+ }
+
+ trace0:
+ if (PREDICT_FALSE
+ ((node->flags & VLIB_NODE_FLAG_TRACE)
+ && (b0->flags & VLIB_BUFFER_IS_TRACED)))
+ {
+ nat64_in2out_reass_trace_t *t =
+ vlib_add_trace (vm, node, b0, sizeof (*t));
+ t->cached = cached0;
+ t->sw_if_index = sw_if_index0;
+ t->next_index = next0;
+ }
+
+ if (cached0)
+ {
+ n_left_to_next++;
+ to_next--;
+ }
+ else
+ {
+ pkts_processed += next0 != NAT64_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);
+ }
+
+ if (n_left_from == 0 && vec_len (fragments_to_loopback))
+ {
+ from = vlib_frame_vector_args (frame);
+ u32 len = vec_len (fragments_to_loopback);
+ if (len <= VLIB_FRAME_SIZE)
+ {
+ clib_memcpy (from, fragments_to_loopback,
+ sizeof (u32) * len);
+ n_left_from = len;
+ vec_reset_length (fragments_to_loopback);
+ }
+ else
+ {
+ clib_memcpy (from,
+ fragments_to_loopback + (len -
+ VLIB_FRAME_SIZE),
+ sizeof (u32) * VLIB_FRAME_SIZE);
+ n_left_from = VLIB_FRAME_SIZE;
+ _vec_len (fragments_to_loopback) = len - VLIB_FRAME_SIZE;
+ }
+ }
+ }
+
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ }
+
+ vlib_node_increment_counter (vm, nat64_in2out_reass_node.index,
+ NAT64_IN2OUT_ERROR_IN2OUT_PACKETS,
+ pkts_processed);
+
+ nat_send_all_to_node (vm, fragments_to_drop, node,
+ &node->errors[NAT64_IN2OUT_ERROR_DROP_FRAGMENT],
+ NAT64_IN2OUT_NEXT_DROP);
+
+ vec_free (fragments_to_drop);
+ vec_free (fragments_to_loopback);
+ return frame->n_vectors;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (nat64_in2out_reass_node) = {
+ .function = nat64_in2out_reass_node_fn,
+ .name = "nat64-in2out-reass",
+ .vector_size = sizeof (u32),
+ .format_trace = format_nat64_in2out_reass_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+ .n_errors = ARRAY_LEN (nat64_in2out_error_strings),
+ .error_strings = nat64_in2out_error_strings,
+ .n_next_nodes = NAT64_IN2OUT_N_NEXT,
+ /* edit / add dispositions here */
+ .next_nodes = {
+ [NAT64_IN2OUT_NEXT_DROP] = "error-drop",
+ [NAT64_IN2OUT_NEXT_IP4_LOOKUP] = "ip4-lookup",
+ [NAT64_IN2OUT_NEXT_IP6_LOOKUP] = "ip6-lookup",
+ [NAT64_IN2OUT_NEXT_SLOWPATH] = "nat64-in2out-slowpath",
+ [NAT64_IN2OUT_NEXT_REASS] = "nat64-in2out-reass",
+ },
+};
+/* *INDENT-ON* */
+
+VLIB_NODE_FUNCTION_MULTIARCH (nat64_in2out_reass_node,
+ nat64_in2out_reass_node_fn);
+
/*
* fd.io coding-style-patch-verification: ON
*
diff --git a/src/plugins/nat/nat64_out2in.c b/src/plugins/nat/nat64_out2in.c
index 61e88a7f304..eb5ecb4588d 100644
--- a/src/plugins/nat/nat64_out2in.c
+++ b/src/plugins/nat/nat64_out2in.c
@@ -18,6 +18,7 @@
*/
#include <nat/nat64.h>
+#include <nat/nat_reass.h>
#include <vnet/ip/ip4_to_ip6.h>
#include <vnet/fib/ip4_fib.h>
@@ -41,13 +42,41 @@ format_nat64_out2in_trace (u8 * s, va_list * args)
return s;
}
+typedef struct
+{
+ u32 sw_if_index;
+ u32 next_index;
+ u8 cached;
+} nat64_out2in_reass_trace_t;
+
+static u8 *
+format_nat64_out2in_reass_trace (u8 * s, va_list * args)
+{
+ CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
+ CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
+ nat64_out2in_reass_trace_t *t =
+ va_arg (*args, nat64_out2in_reass_trace_t *);
+
+ s =
+ format (s, "NAT64-out2in-reass: sw_if_index %d, next index %d, status %s",
+ t->sw_if_index, t->next_index,
+ t->cached ? "cached" : "translated");
+
+ return s;
+}
+
vlib_node_registration_t nat64_out2in_node;
+vlib_node_registration_t nat64_out2in_reass_node;
+
+#define foreach_nat64_out2in_error \
+_(UNSUPPORTED_PROTOCOL, "Unsupported protocol") \
+_(OUT2IN_PACKETS, "Good out2in packets processed") \
+_(NO_TRANSLATION, "No translation") \
+_(UNKNOWN, "unknown") \
+_(DROP_FRAGMENT, "Drop fragment") \
+_(MAX_REASS, "Maximum reassemblies exceeded") \
+_(MAX_FRAG, "Maximum fragments per reassembly exceeded")
-#define foreach_nat64_out2in_error \
-_(UNSUPPORTED_PROTOCOL, "Unsupported protocol") \
-_(OUT2IN_PACKETS, "Good out2in packets processed") \
-_(NO_TRANSLATION, "No translation") \
-_(UNKNOWN, "unknown")
typedef enum
{
@@ -67,6 +96,7 @@ typedef enum
{
NAT64_OUT2IN_NEXT_LOOKUP,
NAT64_OUT2IN_NEXT_DROP,
+ NAT64_OUT2IN_NEXT_REASS,
NAT64_OUT2IN_N_NEXT,
} nat64_out2in_next_t;
@@ -412,20 +442,27 @@ nat64_out2in_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
proto0 = ip_proto_to_snat_proto (ip40->protocol);
- if (proto0 == SNAT_PROTOCOL_ICMP)
+ if (PREDICT_FALSE (proto0 == ~0))
{
- if (icmp_to_icmp6
- (b0, nat64_out2in_icmp_set_cb, &ctx0,
- nat64_out2in_inner_icmp_set_cb, &ctx0))
+ if (ip4_to_ip6 (b0, nat64_out2in_unk_proto_set_cb, &ctx0))
{
next0 = NAT64_OUT2IN_NEXT_DROP;
b0->error = node->errors[NAT64_OUT2IN_ERROR_NO_TRANSLATION];
- goto trace0;
}
+ goto trace0;
}
- else if (proto0 == SNAT_PROTOCOL_TCP || proto0 == SNAT_PROTOCOL_UDP)
+
+ if (PREDICT_FALSE (ip4_is_fragment (ip40)))
{
- if (ip4_to_ip6_tcp_udp (b0, nat64_out2in_tcp_udp_set_cb, &ctx0))
+ next0 = NAT64_OUT2IN_NEXT_REASS;
+ goto trace0;
+ }
+
+ if (proto0 == SNAT_PROTOCOL_ICMP)
+ {
+ if (icmp_to_icmp6
+ (b0, nat64_out2in_icmp_set_cb, &ctx0,
+ nat64_out2in_inner_icmp_set_cb, &ctx0))
{
next0 = NAT64_OUT2IN_NEXT_DROP;
b0->error = node->errors[NAT64_OUT2IN_ERROR_NO_TRANSLATION];
@@ -434,7 +471,7 @@ nat64_out2in_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
}
else
{
- if (ip4_to_ip6 (b0, nat64_out2in_unk_proto_set_cb, &ctx0))
+ if (ip4_to_ip6_tcp_udp (b0, nat64_out2in_tcp_udp_set_cb, &ctx0))
{
next0 = NAT64_OUT2IN_NEXT_DROP;
b0->error = node->errors[NAT64_OUT2IN_ERROR_NO_TRANSLATION];
@@ -474,17 +511,361 @@ VLIB_REGISTER_NODE (nat64_out2in_node) = {
.format_trace = format_nat64_out2in_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN (nat64_out2in_error_strings),
- .error_strings = nat64_out2in_error_strings,.n_next_nodes = 2,
+ .error_strings = nat64_out2in_error_strings,
+ .n_next_nodes = NAT64_OUT2IN_N_NEXT,
/* edit / add dispositions here */
.next_nodes = {
[NAT64_OUT2IN_NEXT_DROP] = "error-drop",
[NAT64_OUT2IN_NEXT_LOOKUP] = "ip6-lookup",
+ [NAT64_OUT2IN_NEXT_REASS] = "nat64-out2in-reass",
},
};
/* *INDENT-ON* */
VLIB_NODE_FUNCTION_MULTIARCH (nat64_out2in_node, nat64_out2in_node_fn);
+typedef struct nat64_out2in_frag_set_ctx_t_
+{
+ vlib_main_t *vm;
+ vlib_buffer_t *b;
+ u32 sess_index;
+ u8 proto;
+ u8 first_frag;
+} nat64_out2in_frag_set_ctx_t;
+
+static int
+nat64_out2in_frag_set_cb (ip4_header_t * ip4, ip6_header_t * ip6, void *arg)
+{
+ nat64_main_t *nm = &nat64_main;
+ nat64_out2in_frag_set_ctx_t *ctx = arg;
+ nat64_db_st_entry_t *ste;
+ nat64_db_bib_entry_t *bibe;
+ udp_header_t *udp = ip4_next_header (ip4);
+ ip_csum_t csum;
+ u16 *checksum;
+
+ ste = nat64_db_st_entry_by_index (&nm->db, ctx->proto, ctx->sess_index);
+ if (!ste)
+ return -1;
+
+ bibe = nat64_db_bib_entry_by_index (&nm->db, ctx->proto, ste->bibe_index);
+ if (!bibe)
+ return -1;
+
+ nat64_session_reset_timeout (ste, ctx->vm);
+
+ if (ctx->first_frag)
+ {
+ udp->dst_port = bibe->in_port;
+
+ if (ip4->protocol == IP_PROTOCOL_UDP)
+ {
+ checksum = &udp->checksum;
+
+ if (!checksum)
+ {
+ u16 udp_len =
+ clib_host_to_net_u16 (ip4->length) - sizeof (*ip4);
+ csum = ip_incremental_checksum (0, udp, udp_len);
+ csum =
+ ip_csum_with_carry (csum, clib_host_to_net_u16 (udp_len));
+ csum =
+ ip_csum_with_carry (csum,
+ clib_host_to_net_u16 (IP_PROTOCOL_UDP));
+ csum = ip_csum_with_carry (csum, ste->in_r_addr.as_u64[0]);
+ csum = ip_csum_with_carry (csum, ste->in_r_addr.as_u64[1]);
+ csum = ip_csum_with_carry (csum, bibe->in_addr.as_u64[0]);
+ csum = ip_csum_with_carry (csum, bibe->in_addr.as_u64[1]);
+ *checksum = ~ip_csum_fold (csum);
+ }
+ else
+ {
+ csum = ip_csum_sub_even (*checksum, bibe->out_addr.as_u32);
+ csum = ip_csum_sub_even (csum, ste->out_r_addr.as_u32);
+ csum = ip_csum_sub_even (csum, bibe->out_port);
+ csum = ip_csum_add_even (csum, ste->in_r_addr.as_u64[0]);
+ csum = ip_csum_add_even (csum, ste->in_r_addr.as_u64[1]);
+ csum = ip_csum_add_even (csum, bibe->in_addr.as_u64[0]);
+ csum = ip_csum_add_even (csum, bibe->in_addr.as_u64[1]);
+ csum = ip_csum_add_even (csum, bibe->in_port);
+ *checksum = ip_csum_fold (csum);
+ }
+ }
+ else
+ {
+ tcp_header_t *tcp = ip4_next_header (ip4);
+ checksum = &tcp->checksum;
+ csum = ip_csum_sub_even (*checksum, bibe->out_addr.as_u32);
+ csum = ip_csum_sub_even (csum, ste->out_r_addr.as_u32);
+ csum = ip_csum_sub_even (csum, bibe->out_port);
+ csum = ip_csum_add_even (csum, ste->in_r_addr.as_u64[0]);
+ csum = ip_csum_add_even (csum, ste->in_r_addr.as_u64[1]);
+ csum = ip_csum_add_even (csum, bibe->in_addr.as_u64[0]);
+ csum = ip_csum_add_even (csum, bibe->in_addr.as_u64[1]);
+ csum = ip_csum_add_even (csum, bibe->in_port);
+ *checksum = ip_csum_fold (csum);
+ }
+
+ }
+
+ ip6->src_address.as_u64[0] = ste->in_r_addr.as_u64[0];
+ ip6->src_address.as_u64[1] = ste->in_r_addr.as_u64[1];
+
+ ip6->dst_address.as_u64[0] = bibe->in_addr.as_u64[0];
+ ip6->dst_address.as_u64[1] = bibe->in_addr.as_u64[1];
+
+ vnet_buffer (ctx->b)->sw_if_index[VLIB_TX] = bibe->fib_index;
+
+ return 0;
+}
+
+static uword
+nat64_out2in_reass_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ u32 n_left_from, *from, *to_next;
+ nat64_out2in_next_t next_index;
+ u32 pkts_processed = 0;
+ u32 *fragments_to_drop = 0;
+ u32 *fragments_to_loopback = 0;
+ nat64_main_t *nm = &nat64_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 *ip40;
+ u8 cached0 = 0;
+ u32 sw_if_index0, fib_index0;
+ udp_header_t *udp0;
+ nat_reass_ip4_t *reass0;
+ ip46_address_t saddr0, daddr0;
+ nat64_db_st_entry_t *ste0;
+ nat64_db_bib_entry_t *bibe0;
+ ip6_address_t ip6_saddr0;
+ nat64_out2in_frag_set_ctx_t ctx0;
+
+ /* 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 = NAT64_OUT2IN_NEXT_LOOKUP;
+
+ sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
+ fib_index0 =
+ fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
+ sw_if_index0);
+
+ if (PREDICT_FALSE (nat_reass_is_drop_frag (1)))
+ {
+ next0 = NAT64_OUT2IN_NEXT_DROP;
+ b0->error = node->errors[NAT64_OUT2IN_ERROR_DROP_FRAGMENT];
+ goto trace0;
+ }
+
+ ip40 = vlib_buffer_get_current (b0);
+
+ if (PREDICT_FALSE (!(ip40->protocol == IP_PROTOCOL_TCP
+ || ip40->protocol == IP_PROTOCOL_UDP)))
+ {
+ next0 = NAT64_OUT2IN_NEXT_DROP;
+ b0->error = node->errors[NAT64_OUT2IN_ERROR_DROP_FRAGMENT];
+ goto trace0;
+ }
+
+ udp0 = ip4_next_header (ip40);
+
+ reass0 = nat_ip4_reass_find_or_create (ip40->src_address,
+ ip40->dst_address,
+ ip40->fragment_id,
+ ip40->protocol,
+ 1, &fragments_to_drop);
+
+ if (PREDICT_FALSE (!reass0))
+ {
+ next0 = NAT64_OUT2IN_NEXT_DROP;
+ b0->error = node->errors[NAT64_OUT2IN_ERROR_MAX_REASS];
+ goto trace0;
+ }
+
+ if (PREDICT_FALSE (ip4_is_first_fragment (ip40)))
+ {
+ ctx0.first_frag = 1;
+
+ memset (&saddr0, 0, sizeof (saddr0));
+ saddr0.ip4.as_u32 = ip40->src_address.as_u32;
+ memset (&daddr0, 0, sizeof (daddr0));
+ daddr0.ip4.as_u32 = ip40->dst_address.as_u32;
+
+ ste0 =
+ nat64_db_st_entry_find (&nm->db, &daddr0, &saddr0,
+ udp0->dst_port, udp0->src_port,
+ ip40->protocol, fib_index0, 0);
+ if (!ste0)
+ {
+ bibe0 =
+ nat64_db_bib_entry_find (&nm->db, &daddr0, udp0->dst_port,
+ ip40->protocol, fib_index0, 0);
+ if (!bibe0)
+ {
+ next0 = NAT64_OUT2IN_NEXT_DROP;
+ b0->error =
+ node->errors[NAT64_OUT2IN_ERROR_NO_TRANSLATION];
+ goto trace0;
+ }
+
+ nat64_compose_ip6 (&ip6_saddr0, &ip40->src_address,
+ bibe0->fib_index);
+ ste0 =
+ nat64_db_st_entry_create (&nm->db, bibe0, &ip6_saddr0,
+ &saddr0.ip4, udp0->src_port);
+
+ if (!ste0)
+ {
+ next0 = NAT64_OUT2IN_NEXT_DROP;
+ b0->error =
+ node->errors[NAT64_OUT2IN_ERROR_NO_TRANSLATION];
+ goto trace0;
+ }
+ }
+ reass0->sess_index =
+ nat64_db_st_entry_get_index (&nm->db, ste0);
+
+ nat_ip4_reass_get_frags (reass0, &fragments_to_loopback);
+ }
+ else
+ {
+ ctx0.first_frag = 0;
+
+ if (PREDICT_FALSE (reass0->sess_index == (u32) ~ 0))
+ {
+ if (nat_ip4_reass_add_fragment (reass0, bi0))
+ {
+ b0->error = node->errors[NAT64_OUT2IN_ERROR_MAX_FRAG];
+ next0 = NAT64_OUT2IN_NEXT_DROP;
+ goto trace0;
+ }
+ cached0 = 1;
+ goto trace0;
+ }
+ }
+
+ ctx0.sess_index = reass0->sess_index;
+ ctx0.proto = ip40->protocol;
+ ctx0.vm = vm;
+ ctx0.b = b0;
+
+ if (ip4_to_ip6_fragmented (b0, nat64_out2in_frag_set_cb, &ctx0))
+ {
+ next0 = NAT64_OUT2IN_NEXT_DROP;
+ b0->error = node->errors[NAT64_OUT2IN_ERROR_UNKNOWN];
+ goto trace0;
+ }
+
+ trace0:
+ if (PREDICT_FALSE
+ ((node->flags & VLIB_NODE_FLAG_TRACE)
+ && (b0->flags & VLIB_BUFFER_IS_TRACED)))
+ {
+ nat64_out2in_reass_trace_t *t =
+ vlib_add_trace (vm, node, b0, sizeof (*t));
+ t->cached = cached0;
+ t->sw_if_index = sw_if_index0;
+ t->next_index = next0;
+ }
+
+ if (cached0)
+ {
+ n_left_to_next++;
+ to_next--;
+ }
+ else
+ {
+ pkts_processed += next0 != NAT64_OUT2IN_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);
+ }
+
+ if (n_left_from == 0 && vec_len (fragments_to_loopback))
+ {
+ from = vlib_frame_vector_args (frame);
+ u32 len = vec_len (fragments_to_loopback);
+ if (len <= VLIB_FRAME_SIZE)
+ {
+ clib_memcpy (from, fragments_to_loopback,
+ sizeof (u32) * len);
+ n_left_from = len;
+ vec_reset_length (fragments_to_loopback);
+ }
+ else
+ {
+ clib_memcpy (from,
+ fragments_to_loopback + (len -
+ VLIB_FRAME_SIZE),
+ sizeof (u32) * VLIB_FRAME_SIZE);
+ n_left_from = VLIB_FRAME_SIZE;
+ _vec_len (fragments_to_loopback) = len - VLIB_FRAME_SIZE;
+ }
+ }
+ }
+
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ }
+
+ vlib_node_increment_counter (vm, nat64_out2in_reass_node.index,
+ NAT64_OUT2IN_ERROR_OUT2IN_PACKETS,
+ pkts_processed);
+
+ nat_send_all_to_node (vm, fragments_to_drop, node,
+ &node->errors[NAT64_OUT2IN_ERROR_DROP_FRAGMENT],
+ NAT64_OUT2IN_NEXT_DROP);
+
+ vec_free (fragments_to_drop);
+ vec_free (fragments_to_loopback);
+ return frame->n_vectors;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (nat64_out2in_reass_node) = {
+ .function = nat64_out2in_reass_node_fn,
+ .name = "nat64-out2in-reass",
+ .vector_size = sizeof (u32),
+ .format_trace = format_nat64_out2in_reass_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+ .n_errors = ARRAY_LEN (nat64_out2in_error_strings),
+ .error_strings = nat64_out2in_error_strings,
+ .n_next_nodes = NAT64_OUT2IN_N_NEXT,
+ /* edit / add dispositions here */
+ .next_nodes = {
+ [NAT64_OUT2IN_NEXT_DROP] = "error-drop",
+ [NAT64_OUT2IN_NEXT_LOOKUP] = "ip6-lookup",
+ [NAT64_OUT2IN_NEXT_REASS] = "nat64-out2in-reass",
+ },
+};
+/* *INDENT-ON* */
+
+VLIB_NODE_FUNCTION_MULTIARCH (nat64_out2in_reass_node,
+ nat64_out2in_reass_node_fn);
+
/*
* fd.io coding-style-patch-verification: ON
*
diff --git a/src/plugins/nat/nat_api.c b/src/plugins/nat/nat_api.c
index 0ffa2f0e772..548a9e03bc4 100644
--- a/src/plugins/nat/nat_api.c
+++ b/src/plugins/nat/nat_api.c
@@ -22,6 +22,7 @@
#include <nat/nat_det.h>
#include <nat/nat64.h>
#include <nat/dslite.h>
+#include <nat/nat_reass.h>
#include <vlibapi/api.h>
#include <vlibmemory/api.h>
@@ -1496,6 +1497,146 @@ vl_api_nat_ipfix_enable_disable_t_print (vl_api_nat_ipfix_enable_disable_t *
FINISH;
}
+static void
+vl_api_nat_set_reass_t_handler (vl_api_nat_set_reass_t * mp)
+{
+ snat_main_t *sm = &snat_main;
+ vl_api_nat_set_reass_reply_t *rmp;
+ int rv = 0;
+
+ rv =
+ nat_reass_set (ntohl (mp->timeout), ntohs (mp->max_reass), mp->max_frag,
+ mp->drop_frag, mp->is_ip6);
+
+ REPLY_MACRO (VL_API_NAT_SET_REASS_REPLY);
+}
+
+static void *
+vl_api_nat_set_reass_t_print (vl_api_nat_set_reass_t * mp, void *handle)
+{
+ u8 *s;
+
+ s = format (0, "SCRIPT: nat_set_reass ");
+ s = format (s, "timeout %d max_reass %d max_frag %d drop_frag %d is_ip6 %d",
+ clib_host_to_net_u32 (mp->timeout),
+ clib_host_to_net_u16 (mp->max_reass),
+ mp->max_frag, mp->drop_frag, mp->is_ip6);
+
+ FINISH;
+}
+
+static void
+vl_api_nat_get_reass_t_handler (vl_api_nat_get_reass_t * mp)
+{
+ snat_main_t *sm = &snat_main;
+ vl_api_nat_get_reass_reply_t *rmp;
+ int rv = 0;
+
+ /* *INDENT-OFF* */
+ REPLY_MACRO2 (VL_API_NAT_GET_REASS_REPLY,
+ ({
+ rmp->ip4_timeout = htonl (nat_reass_get_timeout(0));
+ rmp->ip4_max_reass = htons (nat_reass_get_max_reass(0));
+ rmp->ip4_max_frag = nat_reass_get_max_frag(0);
+ rmp->ip4_drop_frag = nat_reass_is_drop_frag(0);
+ rmp->ip6_timeout = htonl (nat_reass_get_timeout(1));
+ rmp->ip6_max_reass = htons (nat_reass_get_max_reass(1));
+ rmp->ip6_max_frag = nat_reass_get_max_frag(1);
+ rmp->ip6_drop_frag = nat_reass_is_drop_frag(1);
+ }))
+ /* *INDENT-ON* */
+}
+
+static void *
+vl_api_nat_get_reass_t_print (vl_api_nat_get_reass_t * mp, void *handle)
+{
+ u8 *s;
+
+ s = format (0, "SCRIPT: nat_get_reass");
+
+ FINISH;
+}
+
+typedef struct nat_api_walk_ctx_t_
+{
+ unix_shared_memory_queue_t *q;
+ u32 context;
+} nat_api_walk_ctx_t;
+
+static int
+nat_ip4_reass_walk_api (nat_reass_ip4_t * reass, void *arg)
+{
+ vl_api_nat_reass_details_t *rmp;
+ snat_main_t *sm = &snat_main;
+ nat_api_walk_ctx_t *ctx = arg;
+
+ rmp = vl_msg_api_alloc (sizeof (*rmp));
+ memset (rmp, 0, sizeof (*rmp));
+ rmp->_vl_msg_id = ntohs (VL_API_NAT_REASS_DETAILS + sm->msg_id_base);
+ rmp->context = ctx->context;
+ clib_memcpy (rmp->src_addr, &(reass->key.src), 4);
+ clib_memcpy (rmp->dst_addr, &(reass->key.dst), 4);
+ rmp->proto = reass->key.proto;
+ rmp->frag_id = ntohl (reass->key.frag_id);
+ rmp->frag_n = reass->frag_n;
+ rmp->is_ip4 = 1;
+
+ vl_msg_api_send_shmem (ctx->q, (u8 *) & rmp);
+
+ return 0;
+}
+
+static int
+nat_ip6_reass_walk_api (nat_reass_ip6_t * reass, void *arg)
+{
+ vl_api_nat_reass_details_t *rmp;
+ snat_main_t *sm = &snat_main;
+ nat_api_walk_ctx_t *ctx = arg;
+
+ rmp = vl_msg_api_alloc (sizeof (*rmp));
+ memset (rmp, 0, sizeof (*rmp));
+ rmp->_vl_msg_id = ntohs (VL_API_NAT_REASS_DETAILS + sm->msg_id_base);
+ rmp->context = ctx->context;
+ clib_memcpy (rmp->src_addr, &(reass->key.src), 16);
+ clib_memcpy (rmp->dst_addr, &(reass->key.dst), 16);
+ rmp->proto = reass->key.proto;
+ rmp->frag_id = ntohl (reass->key.frag_id);
+ rmp->frag_n = reass->frag_n;
+ rmp->is_ip4 = 0;
+
+ vl_msg_api_send_shmem (ctx->q, (u8 *) & rmp);
+
+ return 0;
+}
+
+static void
+vl_api_nat_reass_dump_t_handler (vl_api_nat_reass_dump_t * mp)
+{
+ unix_shared_memory_queue_t *q;
+
+ q = vl_api_client_index_to_input_queue (mp->client_index);
+ if (q == 0)
+ return;
+
+ nat_api_walk_ctx_t ctx = {
+ .q = q,
+ .context = mp->context,
+ };
+
+ nat_ip4_reass_walk (nat_ip4_reass_walk_api, &ctx);
+ nat_ip6_reass_walk (nat_ip6_reass_walk_api, &ctx);
+}
+
+static void *
+vl_api_nat_reass_dump_t_print (vl_api_nat_reass_dump_t * mp, void *handle)
+{
+ u8 *s;
+
+ s = format (0, "SCRIPT: nat_reass_dump");
+
+ FINISH;
+}
+
/*************/
/*** NAT44 ***/
/*************/
@@ -3406,6 +3547,9 @@ _(NAT_SHOW_CONFIG, nat_show_config) \
_(NAT_SET_WORKERS, nat_set_workers) \
_(NAT_WORKER_DUMP, nat_worker_dump) \
_(NAT_IPFIX_ENABLE_DISABLE, nat_ipfix_enable_disable) \
+_(NAT_SET_REASS, nat_set_reass) \
+_(NAT_GET_REASS, nat_get_reass) \
+_(NAT_REASS_DUMP, nat_reass_dump) \
_(NAT44_ADD_DEL_ADDRESS_RANGE, nat44_add_del_address_range) \
_(NAT44_INTERFACE_ADD_DEL_FEATURE, nat44_interface_add_del_feature) \
_(NAT44_ADD_DEL_STATIC_MAPPING, nat44_add_del_static_mapping) \
diff --git a/src/plugins/nat/nat_reass.c b/src/plugins/nat/nat_reass.c
new file mode 100644
index 00000000000..239bc70d836
--- /dev/null
+++ b/src/plugins/nat/nat_reass.c
@@ -0,0 +1,739 @@
+/*
+ * Copyright (c) 2017 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.
+ */
+/**
+ * @file
+ * @brief NAT plugin virtual fragmentation reassembly
+ */
+
+#include <vnet/vnet.h>
+#include <nat/nat_reass.h>
+
+nat_reass_main_t nat_reass_main;
+
+static u32
+nat_reass_get_nbuckets (u8 is_ip6)
+{
+ nat_reass_main_t *srm = &nat_reass_main;
+ u32 nbuckets;
+ u8 i;
+
+ if (is_ip6)
+ nbuckets = (u32) (srm->ip6_max_reass / NAT_REASS_HT_LOAD_FACTOR);
+ else
+ nbuckets = (u32) (srm->ip4_max_reass / NAT_REASS_HT_LOAD_FACTOR);
+
+ for (i = 0; i < 31; i++)
+ if ((1 << i) >= nbuckets)
+ break;
+ nbuckets = 1 << i;
+
+ return nbuckets;
+}
+
+static_always_inline void
+nat_ip4_reass_get_frags_inline (nat_reass_ip4_t * reass, u32 ** bi)
+{
+ nat_reass_main_t *srm = &nat_reass_main;
+ u32 elt_index;
+ dlist_elt_t *elt;
+
+ while ((elt_index =
+ clib_dlist_remove_head (srm->ip4_frags_list_pool,
+ reass->frags_per_reass_list_head_index)) !=
+ ~0)
+ {
+ elt = pool_elt_at_index (srm->ip4_frags_list_pool, elt_index);
+ vec_add1 (*bi, elt->value);
+ reass->frag_n--;
+ pool_put_index (srm->ip4_frags_list_pool, elt_index);
+ }
+}
+
+static_always_inline void
+nat_ip6_reass_get_frags_inline (nat_reass_ip6_t * reass, u32 ** bi)
+{
+ nat_reass_main_t *srm = &nat_reass_main;
+ u32 elt_index;
+ dlist_elt_t *elt;
+
+ while ((elt_index =
+ clib_dlist_remove_head (srm->ip6_frags_list_pool,
+ reass->frags_per_reass_list_head_index)) !=
+ ~0)
+ {
+ elt = pool_elt_at_index (srm->ip6_frags_list_pool, elt_index);
+ vec_add1 (*bi, elt->value);
+ reass->frag_n--;
+ pool_put_index (srm->ip6_frags_list_pool, elt_index);
+ }
+}
+
+int
+nat_reass_set (u32 timeout, u16 max_reass, u8 max_frag, u8 drop_frag,
+ u8 is_ip6)
+{
+ nat_reass_main_t *srm = &nat_reass_main;
+ u32 nbuckets;
+
+ if (is_ip6)
+ {
+ if (srm->ip6_max_reass != max_reass)
+ {
+ clib_spinlock_lock_if_init (&srm->ip6_reass_lock);
+
+ srm->ip6_max_reass = max_reass;
+ pool_free (srm->ip6_reass_pool);
+ pool_alloc (srm->ip6_reass_pool, srm->ip4_max_reass);
+ nbuckets = nat_reass_get_nbuckets (0);
+ clib_bihash_free_48_8 (&srm->ip6_reass_hash);
+ clib_bihash_init_48_8 (&srm->ip6_reass_hash, "nat-ip6-reass",
+ nbuckets, nbuckets * 1024);
+
+ clib_spinlock_unlock_if_init (&srm->ip6_reass_lock);
+ }
+ srm->ip6_timeout = timeout;
+ srm->ip6_max_frag = max_frag;
+ srm->ip6_drop_frag = drop_frag;
+ }
+ else
+ {
+ if (srm->ip4_max_reass != max_reass)
+ {
+ clib_spinlock_lock_if_init (&srm->ip4_reass_lock);
+
+ srm->ip4_max_reass = max_reass;
+ pool_free (srm->ip4_reass_pool);
+ pool_alloc (srm->ip4_reass_pool, srm->ip4_max_reass);
+ nbuckets = nat_reass_get_nbuckets (0);
+ clib_bihash_free_16_8 (&srm->ip4_reass_hash);
+ clib_bihash_init_16_8 (&srm->ip4_reass_hash, "nat-ip4-reass",
+ nbuckets, nbuckets * 1024);
+ clib_spinlock_unlock_if_init (&srm->ip4_reass_lock);
+ }
+ srm->ip4_timeout = timeout;
+ srm->ip4_max_frag = max_frag;
+ srm->ip4_drop_frag = drop_frag;
+ }
+
+ return 0;
+}
+
+u32
+nat_reass_get_timeout (u8 is_ip6)
+{
+ nat_reass_main_t *srm = &nat_reass_main;
+
+ if (is_ip6)
+ return srm->ip6_timeout;
+
+ return srm->ip4_timeout;
+}
+
+u16
+nat_reass_get_max_reass (u8 is_ip6)
+{
+ nat_reass_main_t *srm = &nat_reass_main;
+
+ if (is_ip6)
+ return srm->ip6_max_reass;
+
+ return srm->ip4_max_reass;
+}
+
+u8
+nat_reass_get_max_frag (u8 is_ip6)
+{
+ nat_reass_main_t *srm = &nat_reass_main;
+
+ if (is_ip6)
+ return srm->ip6_max_frag;
+
+ return srm->ip4_max_frag;
+}
+
+u8
+nat_reass_is_drop_frag (u8 is_ip6)
+{
+ nat_reass_main_t *srm = &nat_reass_main;
+
+ if (is_ip6)
+ return srm->ip6_drop_frag;
+
+ return srm->ip4_drop_frag;
+}
+
+static_always_inline nat_reass_ip4_t *
+nat_ip4_reass_lookup (nat_reass_ip4_key_t * k, f64 now)
+{
+ nat_reass_main_t *srm = &nat_reass_main;
+ clib_bihash_kv_16_8_t kv, value;
+ nat_reass_ip4_t *reass;
+
+ kv.key[0] = k->as_u64[0];
+ kv.key[1] = k->as_u64[1];
+
+ if (clib_bihash_search_16_8 (&srm->ip4_reass_hash, &kv, &value))
+ return 0;
+
+ reass = pool_elt_at_index (srm->ip4_reass_pool, value.value);
+ if (now < reass->last_heard + (f64) srm->ip4_timeout)
+ return reass;
+
+ return 0;
+}
+
+nat_reass_ip4_t *
+nat_ip4_reass_find_or_create (ip4_address_t src, ip4_address_t dst,
+ u16 frag_id, u8 proto, u8 reset_timeout,
+ u32 ** bi_to_drop)
+{
+ nat_reass_main_t *srm = &nat_reass_main;
+ nat_reass_ip4_t *reass = 0;
+ nat_reass_ip4_key_t k;
+ f64 now = vlib_time_now (srm->vlib_main);
+ dlist_elt_t *oldest_elt, *elt;
+ dlist_elt_t *per_reass_list_head_elt;
+ u32 oldest_index, elt_index;
+ clib_bihash_kv_16_8_t kv;
+
+ k.src.as_u32 = src.as_u32;
+ k.dst.as_u32 = dst.as_u32;
+ k.frag_id = frag_id;
+ k.proto = proto;
+
+ clib_spinlock_lock_if_init (&srm->ip4_reass_lock);
+
+ reass = nat_ip4_reass_lookup (&k, now);
+ if (reass)
+ {
+ if (reset_timeout)
+ {
+ reass->last_heard = now;
+ clib_dlist_remove (srm->ip4_reass_lru_list_pool,
+ reass->lru_list_index);
+ clib_dlist_addtail (srm->ip4_reass_lru_list_pool,
+ srm->ip4_reass_head_index,
+ reass->lru_list_index);
+ }
+ goto unlock;
+ }
+
+ if (srm->ip4_reass_n >= srm->ip4_max_reass)
+ {
+ oldest_index =
+ clib_dlist_remove_head (srm->ip4_reass_lru_list_pool,
+ srm->ip4_reass_head_index);
+ ASSERT (oldest_index != ~0);
+ oldest_elt =
+ pool_elt_at_index (srm->ip4_reass_lru_list_pool, oldest_index);
+ reass = pool_elt_at_index (srm->ip4_reass_pool, oldest_elt->value);
+ if (now < reass->last_heard + (f64) srm->ip4_timeout)
+ {
+ clib_dlist_addhead (srm->ip4_reass_lru_list_pool,
+ srm->ip4_reass_head_index, oldest_index);
+ clib_warning ("no free resassembly slot");
+ reass = 0;
+ goto unlock;
+ }
+
+ clib_dlist_addtail (srm->ip4_reass_lru_list_pool,
+ srm->ip4_reass_head_index, oldest_index);
+
+ kv.key[0] = k.as_u64[0];
+ kv.key[1] = k.as_u64[1];
+ if (clib_bihash_add_del_16_8 (&srm->ip4_reass_hash, &kv, 0))
+ {
+ reass = 0;
+ goto unlock;
+ }
+
+ nat_ip4_reass_get_frags_inline (reass, bi_to_drop);
+ }
+ else
+ {
+ pool_get (srm->ip4_reass_pool, reass);
+ pool_get (srm->ip4_reass_lru_list_pool, elt);
+ reass->lru_list_index = elt_index = elt - srm->ip4_reass_lru_list_pool;
+ clib_dlist_init (srm->ip4_reass_lru_list_pool, elt_index);
+ elt->value = reass - srm->ip4_reass_pool;
+ clib_dlist_addtail (srm->ip4_reass_lru_list_pool,
+ srm->ip4_reass_head_index, elt_index);
+ pool_get (srm->ip4_frags_list_pool, per_reass_list_head_elt);
+ reass->frags_per_reass_list_head_index =
+ per_reass_list_head_elt - srm->ip4_frags_list_pool;
+ clib_dlist_init (srm->ip4_frags_list_pool,
+ reass->frags_per_reass_list_head_index);
+ srm->ip4_reass_n++;
+ }
+
+ reass->key.as_u64[0] = kv.key[0] = k.as_u64[0];
+ reass->key.as_u64[1] = kv.key[1] = k.as_u64[1];
+ kv.value = reass - srm->ip4_reass_pool;
+ reass->sess_index = (u32) ~ 0;
+ reass->last_heard = now;
+
+ if (clib_bihash_add_del_16_8 (&srm->ip4_reass_hash, &kv, 1))
+ {
+ reass = 0;
+ goto unlock;
+ }
+
+unlock:
+ clib_spinlock_unlock_if_init (&srm->ip4_reass_lock);
+ return reass;
+}
+
+int
+nat_ip4_reass_add_fragment (nat_reass_ip4_t * reass, u32 bi)
+{
+ nat_reass_main_t *srm = &nat_reass_main;
+ dlist_elt_t *elt;
+ u32 elt_index;
+
+ if (reass->frag_n >= srm->ip4_max_frag)
+ return -1;
+
+ clib_spinlock_lock_if_init (&srm->ip4_reass_lock);
+
+ pool_get (srm->ip4_frags_list_pool, elt);
+ elt_index = elt - srm->ip4_frags_list_pool;
+ clib_dlist_init (srm->ip4_frags_list_pool, elt_index);
+ elt->value = bi;
+ clib_dlist_addtail (srm->ip4_frags_list_pool,
+ reass->frags_per_reass_list_head_index, elt_index);
+ reass->frag_n++;
+
+ clib_spinlock_unlock_if_init (&srm->ip4_reass_lock);
+
+ return 0;
+}
+
+void
+nat_ip4_reass_get_frags (nat_reass_ip4_t * reass, u32 ** bi)
+{
+ nat_reass_main_t *srm = &nat_reass_main;
+
+ clib_spinlock_lock_if_init (&srm->ip4_reass_lock);
+
+ nat_ip4_reass_get_frags_inline (reass, bi);
+
+ clib_spinlock_unlock_if_init (&srm->ip4_reass_lock);
+}
+
+void
+nat_ip4_reass_walk (nat_ip4_reass_walk_fn_t fn, void *ctx)
+{
+ nat_reass_ip4_t *reass;
+ nat_reass_main_t *srm = &nat_reass_main;
+ f64 now = vlib_time_now (srm->vlib_main);
+
+ /* *INDENT-OFF* */
+ pool_foreach (reass, srm->ip4_reass_pool,
+ ({
+ if (now < reass->last_heard + (f64) srm->ip4_timeout)
+ {
+ if (fn (reass, ctx))
+ return;
+ }
+ }));
+ /* *INDENT-ON* */
+}
+
+static_always_inline nat_reass_ip6_t *
+nat_ip6_reass_lookup (nat_reass_ip6_key_t * k, f64 now)
+{
+ nat_reass_main_t *srm = &nat_reass_main;
+ clib_bihash_kv_48_8_t kv, value;
+ nat_reass_ip6_t *reass;
+
+ k->unused = 0;
+ kv.key[0] = k->as_u64[0];
+ kv.key[1] = k->as_u64[1];
+ kv.key[2] = k->as_u64[2];
+ kv.key[3] = k->as_u64[3];
+ kv.key[4] = k->as_u64[4];
+ kv.key[5] = k->as_u64[5];
+
+ if (clib_bihash_search_48_8 (&srm->ip6_reass_hash, &kv, &value))
+ return 0;
+
+ reass = pool_elt_at_index (srm->ip6_reass_pool, value.value);
+ if (now < reass->last_heard + (f64) srm->ip6_timeout)
+ return reass;
+
+ return 0;
+}
+
+nat_reass_ip6_t *
+nat_ip6_reass_find_or_create (ip6_address_t src, ip6_address_t dst,
+ u32 frag_id, u8 proto, u8 reset_timeout,
+ u32 ** bi_to_drop)
+{
+ nat_reass_main_t *srm = &nat_reass_main;
+ nat_reass_ip6_t *reass = 0;
+ nat_reass_ip6_key_t k;
+ f64 now = vlib_time_now (srm->vlib_main);
+ dlist_elt_t *oldest_elt, *elt;
+ dlist_elt_t *per_reass_list_head_elt;
+ u32 oldest_index, elt_index;
+ clib_bihash_kv_48_8_t kv;
+
+ k.src.as_u64[0] = src.as_u64[0];
+ k.src.as_u64[1] = src.as_u64[1];
+ k.dst.as_u64[0] = dst.as_u64[0];
+ k.dst.as_u64[1] = dst.as_u64[1];
+ k.frag_id = frag_id;
+ k.proto = proto;
+ k.unused = 0;
+
+ clib_spinlock_lock_if_init (&srm->ip6_reass_lock);
+
+ reass = nat_ip6_reass_lookup (&k, now);
+ if (reass)
+ {
+ if (reset_timeout)
+ {
+ reass->last_heard = now;
+ clib_dlist_remove (srm->ip6_reass_lru_list_pool,
+ reass->lru_list_index);
+ clib_dlist_addtail (srm->ip6_reass_lru_list_pool,
+ srm->ip6_reass_head_index,
+ reass->lru_list_index);
+ }
+ goto unlock;
+ }
+
+ if (srm->ip6_reass_n >= srm->ip6_max_reass)
+ {
+ oldest_index =
+ clib_dlist_remove_head (srm->ip6_reass_lru_list_pool,
+ srm->ip6_reass_head_index);
+ ASSERT (oldest_index != ~0);
+ oldest_elt =
+ pool_elt_at_index (srm->ip4_reass_lru_list_pool, oldest_index);
+ reass = pool_elt_at_index (srm->ip6_reass_pool, oldest_elt->value);
+ if (now < reass->last_heard + (f64) srm->ip6_timeout)
+ {
+ clib_dlist_addhead (srm->ip6_reass_lru_list_pool,
+ srm->ip6_reass_head_index, oldest_index);
+ clib_warning ("no free resassembly slot");
+ reass = 0;
+ goto unlock;
+ }
+
+ clib_dlist_addtail (srm->ip6_reass_lru_list_pool,
+ srm->ip6_reass_head_index, oldest_index);
+
+ kv.key[0] = k.as_u64[0];
+ kv.key[1] = k.as_u64[1];
+ kv.key[2] = k.as_u64[2];
+ kv.key[3] = k.as_u64[4];
+ kv.key[4] = k.as_u64[5];
+ if (clib_bihash_add_del_48_8 (&srm->ip6_reass_hash, &kv, 0))
+ {
+ reass = 0;
+ goto unlock;
+ }
+
+ nat_ip6_reass_get_frags_inline (reass, bi_to_drop);
+ }
+ else
+ {
+ pool_get (srm->ip6_reass_pool, reass);
+ pool_get (srm->ip6_reass_lru_list_pool, elt);
+ reass->lru_list_index = elt_index = elt - srm->ip6_reass_lru_list_pool;
+ clib_dlist_init (srm->ip6_reass_lru_list_pool, elt_index);
+ elt->value = reass - srm->ip6_reass_pool;
+ clib_dlist_addtail (srm->ip6_reass_lru_list_pool,
+ srm->ip6_reass_head_index, elt_index);
+ pool_get (srm->ip6_frags_list_pool, per_reass_list_head_elt);
+ reass->frags_per_reass_list_head_index =
+ per_reass_list_head_elt - srm->ip6_frags_list_pool;
+ clib_dlist_init (srm->ip6_frags_list_pool,
+ reass->frags_per_reass_list_head_index);
+ srm->ip6_reass_n++;
+ }
+
+ reass->key.as_u64[0] = kv.key[0] = k.as_u64[0];
+ reass->key.as_u64[1] = kv.key[1] = k.as_u64[1];
+ reass->key.as_u64[2] = kv.key[2] = k.as_u64[2];
+ reass->key.as_u64[3] = kv.key[3] = k.as_u64[3];
+ reass->key.as_u64[4] = kv.key[4] = k.as_u64[4];
+ reass->key.as_u64[5] = kv.key[5] = k.as_u64[5];
+ kv.value = reass - srm->ip6_reass_pool;
+ reass->sess_index = (u32) ~ 0;
+ reass->last_heard = now;
+
+ if (clib_bihash_add_del_48_8 (&srm->ip6_reass_hash, &kv, 1))
+ {
+ reass = 0;
+ goto unlock;
+ }
+
+unlock:
+ clib_spinlock_unlock_if_init (&srm->ip6_reass_lock);
+ return reass;
+}
+
+int
+nat_ip6_reass_add_fragment (nat_reass_ip6_t * reass, u32 bi)
+{
+ nat_reass_main_t *srm = &nat_reass_main;
+ dlist_elt_t *elt;
+ u32 elt_index;
+
+ if (reass->frag_n >= srm->ip6_max_frag)
+ return -1;
+
+ clib_spinlock_lock_if_init (&srm->ip6_reass_lock);
+
+ pool_get (srm->ip6_frags_list_pool, elt);
+ elt_index = elt - srm->ip6_frags_list_pool;
+ clib_dlist_init (srm->ip6_frags_list_pool, elt_index);
+ elt->value = bi;
+ clib_dlist_addtail (srm->ip6_frags_list_pool,
+ reass->frags_per_reass_list_head_index, elt_index);
+ reass->frag_n++;
+
+ clib_spinlock_unlock_if_init (&srm->ip6_reass_lock);
+
+ return 0;
+}
+
+void
+nat_ip6_reass_get_frags (nat_reass_ip6_t * reass, u32 ** bi)
+{
+ nat_reass_main_t *srm = &nat_reass_main;
+
+ clib_spinlock_lock_if_init (&srm->ip6_reass_lock);
+
+ nat_ip6_reass_get_frags_inline (reass, bi);
+
+ clib_spinlock_unlock_if_init (&srm->ip6_reass_lock);
+}
+
+void
+nat_ip6_reass_walk (nat_ip6_reass_walk_fn_t fn, void *ctx)
+{
+ nat_reass_ip6_t *reass;
+ nat_reass_main_t *srm = &nat_reass_main;
+ f64 now = vlib_time_now (srm->vlib_main);
+
+ /* *INDENT-OFF* */
+ pool_foreach (reass, srm->ip6_reass_pool,
+ ({
+ if (now < reass->last_heard + (f64) srm->ip4_timeout)
+ {
+ if (fn (reass, ctx))
+ return;
+ }
+ }));
+ /* *INDENT-ON* */
+}
+
+clib_error_t *
+nat_reass_init (vlib_main_t * vm)
+{
+ nat_reass_main_t *srm = &nat_reass_main;
+ vlib_thread_main_t *tm = vlib_get_thread_main ();
+ clib_error_t *error = 0;
+ dlist_elt_t *head;
+ u32 nbuckets, head_index;
+
+ srm->vlib_main = vm;
+ srm->vnet_main = vnet_get_main ();
+
+ /* IPv4 */
+ srm->ip4_timeout = NAT_REASS_TIMEOUT_DEFAULT;
+ srm->ip4_max_reass = NAT_MAX_REASS_DEAFULT;
+ srm->ip4_max_frag = NAT_MAX_FRAG_DEFAULT;
+ srm->ip4_drop_frag = 0;
+ srm->ip4_reass_n = 0;
+
+ if (tm->n_vlib_mains > 1)
+ clib_spinlock_init (&srm->ip4_reass_lock);
+
+ pool_alloc (srm->ip4_reass_pool, srm->ip4_max_reass);
+
+ nbuckets = nat_reass_get_nbuckets (0);
+ clib_bihash_init_16_8 (&srm->ip4_reass_hash, "nat-ip4-reass", nbuckets,
+ nbuckets * 1024);
+
+ pool_get (srm->ip4_reass_lru_list_pool, head);
+ srm->ip4_reass_head_index = head_index =
+ head - srm->ip4_reass_lru_list_pool;
+ clib_dlist_init (srm->ip4_reass_lru_list_pool, head_index);
+
+ /* IPv6 */
+ srm->ip6_timeout = NAT_REASS_TIMEOUT_DEFAULT;
+ srm->ip6_max_reass = NAT_MAX_REASS_DEAFULT;
+ srm->ip6_max_frag = NAT_MAX_FRAG_DEFAULT;
+ srm->ip6_drop_frag = 0;
+ srm->ip6_reass_n = 0;
+
+ if (tm->n_vlib_mains > 1)
+ clib_spinlock_init (&srm->ip6_reass_lock);
+
+ pool_alloc (srm->ip6_reass_pool, srm->ip6_max_reass);
+
+ nbuckets = nat_reass_get_nbuckets (1);
+ clib_bihash_init_48_8 (&srm->ip6_reass_hash, "nat-ip6-reass", nbuckets,
+ nbuckets * 1024);
+
+ pool_get (srm->ip6_reass_lru_list_pool, head);
+ srm->ip6_reass_head_index = head_index =
+ head - srm->ip6_reass_lru_list_pool;
+ clib_dlist_init (srm->ip6_reass_lru_list_pool, head_index);
+
+ return error;
+}
+
+static clib_error_t *
+nat_reass_command_fn (vlib_main_t * vm, unformat_input_t * input,
+ vlib_cli_command_t * cmd)
+{
+ clib_error_t *error = 0;
+ unformat_input_t _line_input, *line_input = &_line_input;
+ u32 timeout = 0, max_reass = 0, max_frag = 0;
+ u8 drop_frag = (u8) ~ 0, is_ip6 = 0;
+ int rv;
+
+ /* 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, "max-reassemblies %u", &max_reass))
+ ;
+ else if (unformat (line_input, "max-fragments %u", &max_frag))
+ ;
+ else if (unformat (line_input, "timeout %u", &timeout))
+ ;
+ else if (unformat (line_input, "enable"))
+ drop_frag = 0;
+ else if (unformat (line_input, "disable"))
+ drop_frag = 1;
+ else if (unformat (line_input, "ip4"))
+ is_ip6 = 0;
+ else if (unformat (line_input, "ip6"))
+ is_ip6 = 1;
+ else
+ {
+ error = clib_error_return (0, "unknown input '%U'",
+ format_unformat_error, line_input);
+ goto done;
+ }
+ }
+
+ if (!timeout)
+ timeout = nat_reass_get_timeout (is_ip6);
+ if (!max_reass)
+ max_reass = nat_reass_get_max_reass (is_ip6);
+ if (!max_frag)
+ max_frag = nat_reass_get_max_frag (is_ip6);
+ if (drop_frag == (u8) ~ 0)
+ drop_frag = nat_reass_is_drop_frag (is_ip6);
+
+ rv =
+ nat_reass_set (timeout, (u16) max_reass, (u8) max_frag, drop_frag,
+ is_ip6);
+ if (rv)
+ {
+ error = clib_error_return (0, "nat_set_reass return %d", rv);
+ goto done;
+ }
+
+done:
+ unformat_free (line_input);
+
+ return error;
+}
+
+static int
+nat_ip4_reass_walk_cli (nat_reass_ip4_t * reass, void *ctx)
+{
+ vlib_main_t *vm = ctx;
+
+ vlib_cli_output (vm, " src %U dst %U proto %u id 0x%04x cached %u",
+ format_ip4_address, &reass->key.src,
+ format_ip4_address, &reass->key.dst,
+ reass->key.proto,
+ clib_net_to_host_u16 (reass->key.frag_id), reass->frag_n);
+
+ return 0;
+}
+
+static int
+nat_ip6_reass_walk_cli (nat_reass_ip6_t * reass, void *ctx)
+{
+ vlib_main_t *vm = ctx;
+
+ vlib_cli_output (vm, " src %U dst %U proto %u id 0x%08x cached %u",
+ format_ip6_address, &reass->key.src,
+ format_ip6_address, &reass->key.dst,
+ reass->key.proto,
+ clib_net_to_host_u32 (reass->key.frag_id), reass->frag_n);
+
+ return 0;
+}
+
+static clib_error_t *
+show_nat_reass_command_fn (vlib_main_t * vm, unformat_input_t * input,
+ vlib_cli_command_t * cmd)
+{
+ vlib_cli_output (vm, "NAT IPv4 virtual fragmentation reassembly is %s",
+ nat_reass_is_drop_frag (0) ? "DISABLED" : "ENABLED");
+ vlib_cli_output (vm, " max-reasssemblies %u", nat_reass_get_max_reass (0));
+ vlib_cli_output (vm, " max-fragments %u", nat_reass_get_max_frag (0));
+ vlib_cli_output (vm, " timeout %usec", nat_reass_get_timeout (0));
+ vlib_cli_output (vm, " reassemblies:");
+ nat_ip4_reass_walk (nat_ip4_reass_walk_cli, vm);
+
+ vlib_cli_output (vm, "NAT IPv6 virtual fragmentation reassembly is %s",
+ nat_reass_is_drop_frag (1) ? "DISABLED" : "ENABLED");
+ vlib_cli_output (vm, " max-reasssemblies %u", nat_reass_get_max_reass (1));
+ vlib_cli_output (vm, " max-fragments %u", nat_reass_get_max_frag (1));
+ vlib_cli_output (vm, " timeout %usec", nat_reass_get_timeout (1));
+ vlib_cli_output (vm, " reassemblies:");
+ nat_ip6_reass_walk (nat_ip6_reass_walk_cli, vm);
+
+ return 0;
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (nat_reass_command, static) =
+{
+ .path = "nat virtual-reassembly",
+ .short_help = "nat virtual-reassembly ip4|ip6 [max-reassemblies <n>] "
+ "[max-fragments <n>] [timeout <sec>] [enable|disable]",
+ .function = nat_reass_command_fn,
+};
+
+VLIB_CLI_COMMAND (show_nat_reass_command, static) =
+{
+ .path = "show nat virtual-reassembly",
+ .short_help = "show nat virtual-reassembly",
+ .function = show_nat_reass_command_fn,
+};
+/* *INDENT-ON* */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
diff --git a/src/plugins/nat/nat_reass.h b/src/plugins/nat/nat_reass.h
new file mode 100644
index 00000000000..ae14a9604aa
--- /dev/null
+++ b/src/plugins/nat/nat_reass.h
@@ -0,0 +1,293 @@
+/*
+ * Copyright (c) 2017 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.
+ */
+/**
+ * @file
+ * @brief NAT plugin virtual fragmentation reassembly
+ */
+#ifndef __included_nat_reass_h__
+#define __included_nat_reass_h__
+
+#include <vnet/vnet.h>
+#include <vnet/ip/ip.h>
+#include <vppinfra/bihash_16_8.h>
+#include <vppinfra/bihash_48_8.h>
+#include <vppinfra/dlist.h>
+
+#define NAT_REASS_TIMEOUT_DEFAULT 2
+#define NAT_MAX_REASS_DEAFULT 1024
+#define NAT_MAX_FRAG_DEFAULT 5
+#define NAT_REASS_HT_LOAD_FACTOR (0.75)
+
+typedef struct
+{
+ union
+ {
+ struct
+ {
+ ip4_address_t src;
+ ip4_address_t dst;
+ /* align by making this 4 octets even though its a 2 octets field */
+ u32 frag_id;
+ /* align by making this 4 octets even though its a 1 octet field */
+ u32 proto;
+ };
+ u64 as_u64[2];
+ };
+} nat_reass_ip4_key_t;
+
+/* *INDENT-OFF* */
+typedef CLIB_PACKED(struct
+{
+ nat_reass_ip4_key_t key;
+ u32 lru_list_index;
+ u32 sess_index;
+ f64 last_heard;
+ u32 frags_per_reass_list_head_index;
+ u8 frag_n;
+}) nat_reass_ip4_t;
+/* *INDENT-ON* */
+
+typedef struct
+{
+ union
+ {
+ struct
+ {
+ ip6_address_t src;
+ ip6_address_t dst;
+ u32 frag_id;
+ /* align by making this 4 octets even though its a 1 octet field */
+ u32 proto;
+ u64 unused;
+ };
+ u64 as_u64[6];
+ };
+} nat_reass_ip6_key_t;
+
+/* *INDENT-OFF* */
+typedef CLIB_PACKED(struct
+{
+ nat_reass_ip6_key_t key;
+ u32 lru_list_index;
+ u32 sess_index;
+ f64 last_heard;
+ u32 frags_per_reass_list_head_index;
+ u8 frag_n;
+}) nat_reass_ip6_t;
+/* *INDENT-ON* */
+
+typedef struct
+{
+ /* IPv4 config */
+ u32 ip4_timeout;
+ u16 ip4_max_reass;
+ u8 ip4_max_frag;
+ u8 ip4_drop_frag;
+
+ /* IPv6 config */
+ u32 ip6_timeout;
+ u16 ip6_max_reass;
+ u8 ip6_max_frag;
+ u8 ip6_drop_frag;
+
+ /* IPv4 runtime */
+ nat_reass_ip4_t *ip4_reass_pool;
+ clib_bihash_16_8_t ip4_reass_hash;
+ dlist_elt_t *ip4_reass_lru_list_pool;
+ dlist_elt_t *ip4_frags_list_pool;
+ u32 ip4_reass_head_index;
+ u16 ip4_reass_n;
+ clib_spinlock_t ip4_reass_lock;
+
+ /* IPv6 runtime */
+ nat_reass_ip6_t *ip6_reass_pool;
+ clib_bihash_48_8_t ip6_reass_hash;
+ dlist_elt_t *ip6_reass_lru_list_pool;
+ dlist_elt_t *ip6_frags_list_pool;
+ u32 ip6_reass_head_index;
+ u16 ip6_reass_n;
+ clib_spinlock_t ip6_reass_lock;
+
+ /* convenience */
+ vlib_main_t *vlib_main;
+ vnet_main_t *vnet_main;
+} nat_reass_main_t;
+
+/**
+ * @brief Set NAT virtual fragmentation reassembly configuration.
+ *
+ * @param timeout Reassembly timeout.
+ * @param max_reass Maximum number of concurrent reassemblies.
+ * @param max_frag Maximum number of fragmets per reassembly
+ * @param drop_frag If zero translate fragments, otherwise drop fragments.
+ * @param is_ip6 1 if IPv6, 0 if IPv4.
+ *
+ * @returns 0 on success, non-zero value otherwise.
+ */
+int nat_reass_set (u32 timeout, u16 max_reass, u8 max_frag, u8 drop_frag,
+ u8 is_ip6);
+
+/**
+ * @brief Get reassembly timeout.
+ *
+ * @param is_ip6 1 if IPv6, 0 if IPv4.
+ *
+ * @returns reassembly timeout.
+ */
+u32 nat_reass_get_timeout (u8 is_ip6);
+
+/**
+ * @brief Get maximum number of concurrent reassemblies.
+ *
+ * @param is_ip6 1 if IPv6, 0 if IPv4.
+ *
+ * @returns maximum number of concurrent reassemblies.
+ */
+u16 nat_reass_get_max_reass (u8 is_ip6);
+
+/**
+ * @brief Get maximum number of fragmets per reassembly.
+ *
+ * @param is_ip6 1 if IPv6, 0 if IPv4.
+ *
+ * @returns maximum number of fragmets per reassembly.
+ */
+u8 nat_reass_get_max_frag (u8 is_ip6);
+
+/**
+ * @brief Get status of virtual fragmentation reassembly.
+ *
+ * @param is_ip6 1 if IPv6, 0 if IPv4.
+ *
+ * @returns zero if translate fragments, non-zero value if drop fragments.
+ */
+u8 nat_reass_is_drop_frag (u8 is_ip6);
+
+/**
+ * @brief Initialize NAT virtual fragmentation reassembly.
+ *
+ * @param vm vlib main.
+ *
+ * @return error code.
+ */
+clib_error_t *nat_reass_init (vlib_main_t * vm);
+
+/**
+ * @brief Find or create reassembly.
+ *
+ * @param src Source IPv4 address.
+ * @param dst Destination IPv4 address.
+ * @param frag_id Fragment ID.
+ * @param proto L4 protocol.
+ * @param reset_timeout If non-zero value reset timeout.
+ * @param bi_to_drop Fragments to drop.
+ *
+ * @returns Reassembly data or 0 on failure.
+ */
+nat_reass_ip4_t *nat_ip4_reass_find_or_create (ip4_address_t src,
+ ip4_address_t dst,
+ u16 frag_id, u8 proto,
+ u8 reset_timeout,
+ u32 ** bi_to_drop);
+/**
+ * @brief Cache fragment.
+ *
+ * @param reass Reassembly data.
+ * @param bi Buffer index.
+ *
+ * @returns 0 on success, non-zero value otherwise.
+ */
+int nat_ip4_reass_add_fragment (nat_reass_ip4_t * reass, u32 bi);
+
+/**
+ * @brief Get cached fragments.
+ *
+ * @param reass Reassembly data.
+ * @param bi Vector of buffer indexes.
+ */
+void nat_ip4_reass_get_frags (nat_reass_ip4_t * reass, u32 ** bi);
+
+/**
+ * @breif Call back function when walking IPv4 reassemblies, non-zero return
+ * value stop walk.
+ */
+typedef int (*nat_ip4_reass_walk_fn_t) (nat_reass_ip4_t * reass, void *ctx);
+
+/**
+ * @brief Walk IPv4 reassemblies.
+ *
+ * @param fn The function to invoke on each entry visited.
+ * @param ctx A context passed in the visit function.
+ */
+void nat_ip4_reass_walk (nat_ip4_reass_walk_fn_t fn, void *ctx);
+
+/**
+ * @brief Find or create reassembly.
+ *
+ * @param src Source IPv6 address.
+ * @param dst Destination IPv6 address.
+ * @param frag_id Fragment ID.
+ * @param proto L4 protocol.
+ * @param reset_timeout If non-zero value reset timeout.
+ * @param bi_to_drop Fragments to drop.
+ *
+ * @returns Reassembly data or 0 on failure.
+ */
+nat_reass_ip6_t *nat_ip6_reass_find_or_create (ip6_address_t src,
+ ip6_address_t dst,
+ u32 frag_id, u8 proto,
+ u8 reset_timeout,
+ u32 ** bi_to_drop);
+/**
+ * @brief Cache fragment.
+ *
+ * @param reass Reassembly data.
+ * @param bi Buffer index.
+ *
+ * @returns 0 on success, non-zero value otherwise.
+ */
+int nat_ip6_reass_add_fragment (nat_reass_ip6_t * reass, u32 bi);
+
+/**
+ * @brief Get cached fragments.
+ *
+ * @param reass Reassembly data.
+ * @param bi Vector of buffer indexes.
+ */
+void nat_ip6_reass_get_frags (nat_reass_ip6_t * reass, u32 ** bi);
+
+/**
+ * @breif Call back function when walking IPv6 reassemblies, non-zero return
+ * value stop walk.
+ */
+typedef int (*nat_ip6_reass_walk_fn_t) (nat_reass_ip6_t * reass, void *ctx);
+
+/**
+ * @brief Walk IPv6 reassemblies.
+ *
+ * @param fn The function to invoke on each entry visited.
+ * @param ctx A context passed in the visit function.
+ */
+void nat_ip6_reass_walk (nat_ip6_reass_walk_fn_t fn, void *ctx);
+
+#endif /* __included_nat_reass_h__ */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
diff --git a/src/plugins/nat/out2in.c b/src/plugins/nat/out2in.c
index f250136b86e..489afadb4a2 100755
--- a/src/plugins/nat/out2in.c
+++ b/src/plugins/nat/out2in.c
@@ -25,6 +25,7 @@
#include <nat/nat.h>
#include <nat/nat_ipfix_logging.h>
#include <nat/nat_det.h>
+#include <nat/nat_reass.h>
#include <vppinfra/hash.h>
#include <vppinfra/error.h>
@@ -78,17 +79,40 @@ static u8 * format_snat_out2in_worker_handoff_trace (u8 * s, va_list * args)
return s;
}
+typedef struct {
+ u32 sw_if_index;
+ u32 next_index;
+ u8 cached;
+} nat44_out2in_reass_trace_t;
+
+static u8 * format_nat44_out2in_reass_trace (u8 * s, va_list * args)
+{
+ CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
+ CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
+ nat44_out2in_reass_trace_t * t = va_arg (*args, nat44_out2in_reass_trace_t *);
+
+ s = format (s, "NAT44_OUT2IN_REASS: sw_if_index %d, next index %d, status %s",
+ t->sw_if_index, t->next_index,
+ t->cached ? "cached" : "translated");
+
+ return s;
+}
+
vlib_node_registration_t snat_out2in_node;
vlib_node_registration_t snat_out2in_fast_node;
vlib_node_registration_t snat_out2in_worker_handoff_node;
vlib_node_registration_t snat_det_out2in_node;
+vlib_node_registration_t nat44_out2in_reass_node;
#define foreach_snat_out2in_error \
_(UNSUPPORTED_PROTOCOL, "Unsupported protocol") \
_(OUT2IN_PACKETS, "Good out2in packets processed") \
_(BAD_ICMP_TYPE, "unsupported ICMP type") \
_(NO_TRANSLATION, "No translation") \
-_(MAX_SESSIONS_EXCEEDED, "Maximum sessions exceeded")
+_(MAX_SESSIONS_EXCEEDED, "Maximum sessions exceeded") \
+_(DROP_FRAGMENT, "Drop fragment") \
+_(MAX_REASS, "Maximum reassemblies exceeded") \
+_(MAX_FRAG, "Maximum fragments per reassembly exceeded")
typedef enum {
#define _(sym,str) SNAT_OUT2IN_ERROR_##sym,
@@ -107,6 +131,7 @@ typedef enum {
SNAT_OUT2IN_NEXT_DROP,
SNAT_OUT2IN_NEXT_LOOKUP,
SNAT_OUT2IN_NEXT_ICMP_ERROR,
+ SNAT_OUT2IN_NEXT_REASS,
SNAT_OUT2IN_N_NEXT,
} snat_out2in_next_t;
@@ -139,6 +164,7 @@ create_session_for_static_mapping (snat_main_t *sm,
dlist_elt_t * per_user_translation_list_elt;
dlist_elt_t * per_user_list_head_elt;
ip4_header_t *ip0;
+ udp_header_t *udp0;
if (PREDICT_FALSE (maximum_sessions_exceeded(sm, thread_index)))
{
@@ -147,6 +173,7 @@ create_session_for_static_mapping (snat_main_t *sm,
}
ip0 = vlib_buffer_get_current (b0);
+ udp0 = ip4_next_header (ip0);
user_key.addr = in2out.addr;
user_key.fib_index = in2out.fib_index;
@@ -188,7 +215,8 @@ create_session_for_static_mapping (snat_main_t *sm,
s->outside_address_index = ~0;
s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING;
- s->ext_host_addr.as_u32 = ip0->dst_address.as_u32;
+ s->ext_host_addr.as_u32 = ip0->src_address.as_u32;
+ s->ext_host_port = udp0->src_port;
u->nstaticsessions++;
/* Create list elts */
@@ -1033,6 +1061,12 @@ snat_out2in_node_fn (vlib_main_t * vm,
goto trace0;
}
+ if (PREDICT_FALSE (ip4_is_fragment (ip0)))
+ {
+ next0 = SNAT_OUT2IN_NEXT_REASS;
+ goto trace0;
+ }
+
key0.addr = ip0->dst_address;
key0.port = udp0->dst_port;
key0.protocol = proto0;
@@ -1188,6 +1222,12 @@ snat_out2in_node_fn (vlib_main_t * vm,
goto trace1;
}
+ if (PREDICT_FALSE (ip4_is_fragment (ip1)))
+ {
+ next1 = SNAT_OUT2IN_NEXT_REASS;
+ goto trace1;
+ }
+
key1.addr = ip1->dst_address;
key1.port = udp1->dst_port;
key1.protocol = proto1;
@@ -1379,6 +1419,12 @@ snat_out2in_node_fn (vlib_main_t * vm,
goto trace00;
}
+ if (PREDICT_FALSE (ip4_is_fragment (ip0)))
+ {
+ next0 = SNAT_OUT2IN_NEXT_REASS;
+ goto trace00;
+ }
+
key0.addr = ip0->dst_address;
key0.port = udp0->dst_port;
key0.protocol = proto0;
@@ -1530,10 +1576,294 @@ VLIB_REGISTER_NODE (snat_out2in_node) = {
[SNAT_OUT2IN_NEXT_DROP] = "error-drop",
[SNAT_OUT2IN_NEXT_LOOKUP] = "ip4-lookup",
[SNAT_OUT2IN_NEXT_ICMP_ERROR] = "ip4-icmp-error",
+ [SNAT_OUT2IN_NEXT_REASS] = "nat44-out2in-reass",
},
};
VLIB_NODE_FUNCTION_MULTIARCH (snat_out2in_node, snat_out2in_node_fn);
+static uword
+nat44_out2in_reass_node_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ u32 n_left_from, *from, *to_next;
+ snat_out2in_next_t next_index;
+ u32 pkts_processed = 0;
+ snat_main_t *sm = &snat_main;
+ f64 now = vlib_time_now (vm);
+ u32 thread_index = vlib_get_thread_index ();
+ snat_main_per_thread_data_t *per_thread_data =
+ &sm->per_thread_data[thread_index];
+ u32 *fragments_to_drop = 0;
+ u32 *fragments_to_loopback = 0;
+
+ 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, sw_if_index0, proto0, rx_fib_index0, new_addr0, old_addr0;
+ vlib_buffer_t *b0;
+ u32 next0;
+ u8 cached0 = 0;
+ ip4_header_t *ip0;
+ nat_reass_ip4_t *reass0;
+ udp_header_t * udp0;
+ tcp_header_t * tcp0;
+ snat_session_key_t key0, sm0;
+ clib_bihash_kv_8_8_t kv0, value0;
+ snat_session_t * s0 = 0;
+ u16 old_port0, new_port0;
+ ip_csum_t sum0;
+
+ /* 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_OUT2IN_NEXT_LOOKUP;
+
+ sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
+ rx_fib_index0 = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
+ sw_if_index0);
+
+ if (PREDICT_FALSE (nat_reass_is_drop_frag(0)))
+ {
+ next0 = SNAT_OUT2IN_NEXT_DROP;
+ b0->error = node->errors[SNAT_OUT2IN_ERROR_DROP_FRAGMENT];
+ goto trace0;
+ }
+
+ ip0 = (ip4_header_t *) vlib_buffer_get_current (b0);
+ udp0 = ip4_next_header (ip0);
+ tcp0 = (tcp_header_t *) udp0;
+ proto0 = ip_proto_to_snat_proto (ip0->protocol);
+
+ reass0 = nat_ip4_reass_find_or_create (ip0->src_address,
+ ip0->dst_address,
+ ip0->fragment_id,
+ ip0->protocol,
+ 1,
+ &fragments_to_drop);
+
+ if (PREDICT_FALSE (!reass0))
+ {
+ next0 = SNAT_OUT2IN_NEXT_DROP;
+ b0->error = node->errors[SNAT_OUT2IN_ERROR_MAX_REASS];
+ goto trace0;
+ }
+
+ if (PREDICT_FALSE (ip4_is_first_fragment (ip0)))
+ {
+ key0.addr = ip0->dst_address;
+ key0.port = udp0->dst_port;
+ key0.protocol = proto0;
+ key0.fib_index = rx_fib_index0;
+ kv0.key = key0.as_u64;
+
+ if (clib_bihash_search_8_8 (&per_thread_data->out2in, &kv0, &value0))
+ {
+ /* Try to match static mapping by external address and port,
+ destination address and port in packet */
+ if (snat_static_mapping_match(sm, key0, &sm0, 1, 0))
+ {
+ b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
+ /*
+ * Send DHCP packets to the ipv4 stack, or we won't
+ * be able to use dhcp client on the outside interface
+ */
+ if (proto0 != SNAT_PROTOCOL_UDP
+ || (udp0->dst_port
+ != clib_host_to_net_u16(UDP_DST_PORT_dhcp_to_client)))
+
+ next0 = SNAT_OUT2IN_NEXT_DROP;
+ goto trace0;
+ }
+
+ /* Create session initiated by host from external network */
+ s0 = create_session_for_static_mapping(sm, b0, sm0, key0, node,
+ thread_index);
+ if (!s0)
+ {
+ b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
+ next0 = SNAT_OUT2IN_NEXT_DROP;
+ goto trace0;
+ }
+ reass0->sess_index = s0 - per_thread_data->sessions;
+ }
+ else
+ {
+ s0 = pool_elt_at_index (per_thread_data->sessions,
+ value0.value);
+ reass0->sess_index = value0.value;
+ }
+ nat_ip4_reass_get_frags (reass0, &fragments_to_loopback);
+ }
+ else
+ {
+ if (PREDICT_FALSE (reass0->sess_index == (u32) ~0))
+ {
+ if (nat_ip4_reass_add_fragment (reass0, bi0))
+ {
+ b0->error = node->errors[SNAT_OUT2IN_ERROR_MAX_FRAG];
+ next0 = SNAT_OUT2IN_NEXT_DROP;
+ goto trace0;
+ }
+ cached0 = 1;
+ goto trace0;
+ }
+ s0 = pool_elt_at_index (per_thread_data->sessions,
+ reass0->sess_index);
+ }
+
+ old_addr0 = ip0->dst_address.as_u32;
+ ip0->dst_address = s0->in2out.addr;
+ new_addr0 = ip0->dst_address.as_u32;
+ vnet_buffer(b0)->sw_if_index[VLIB_TX] = s0->in2out.fib_index;
+
+ sum0 = ip0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
+ ip4_header_t,
+ dst_address /* changed member */);
+ ip0->checksum = ip_csum_fold (sum0);
+
+ if (PREDICT_FALSE (ip4_is_first_fragment (ip0)))
+ {
+ if (PREDICT_TRUE(proto0 == SNAT_PROTOCOL_TCP))
+ {
+ old_port0 = tcp0->dst_port;
+ tcp0->dst_port = s0->in2out.port;
+ new_port0 = tcp0->dst_port;
+
+ sum0 = tcp0->checksum;
+ sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
+ ip4_header_t,
+ dst_address /* changed member */);
+
+ sum0 = ip_csum_update (sum0, old_port0, new_port0,
+ ip4_header_t /* cheat */,
+ length /* changed member */);
+ tcp0->checksum = ip_csum_fold(sum0);
+ }
+ else
+ {
+ old_port0 = udp0->dst_port;
+ udp0->dst_port = s0->in2out.port;
+ udp0->checksum = 0;
+ }
+ }
+
+ /* Accounting */
+ s0->last_heard = now;
+ s0->total_pkts++;
+ s0->total_bytes += vlib_buffer_length_in_chain (vm, b0);
+ /* Per-user LRU list maintenance for dynamic translation */
+ if (!snat_is_session_static (s0))
+ {
+ clib_dlist_remove (sm->per_thread_data[thread_index].list_pool,
+ s0->per_user_index);
+ clib_dlist_addtail (sm->per_thread_data[thread_index].list_pool,
+ s0->per_user_list_head_index,
+ s0->per_user_index);
+ }
+
+ trace0:
+ if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
+ && (b0->flags & VLIB_BUFFER_IS_TRACED)))
+ {
+ nat44_out2in_reass_trace_t *t =
+ vlib_add_trace (vm, node, b0, sizeof (*t));
+ t->cached = cached0;
+ t->sw_if_index = sw_if_index0;
+ t->next_index = next0;
+ }
+
+ if (cached0)
+ {
+ n_left_to_next++;
+ to_next--;
+ }
+ else
+ {
+ pkts_processed += next0 != SNAT_OUT2IN_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);
+ }
+
+ if (n_left_from == 0 && vec_len (fragments_to_loopback))
+ {
+ from = vlib_frame_vector_args (frame);
+ u32 len = vec_len (fragments_to_loopback);
+ if (len <= VLIB_FRAME_SIZE)
+ {
+ clib_memcpy (from, fragments_to_loopback, sizeof (u32) * len);
+ n_left_from = len;
+ vec_reset_length (fragments_to_loopback);
+ }
+ else
+ {
+ clib_memcpy (from,
+ fragments_to_loopback + (len - VLIB_FRAME_SIZE),
+ sizeof (u32) * VLIB_FRAME_SIZE);
+ n_left_from = VLIB_FRAME_SIZE;
+ _vec_len (fragments_to_loopback) = len - VLIB_FRAME_SIZE;
+ }
+ }
+ }
+
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ }
+
+ vlib_node_increment_counter (vm, nat44_out2in_reass_node.index,
+ SNAT_OUT2IN_ERROR_OUT2IN_PACKETS,
+ pkts_processed);
+
+ nat_send_all_to_node (vm, fragments_to_drop, node,
+ &node->errors[SNAT_OUT2IN_ERROR_DROP_FRAGMENT],
+ SNAT_OUT2IN_NEXT_DROP);
+
+ vec_free (fragments_to_drop);
+ vec_free (fragments_to_loopback);
+ return frame->n_vectors;
+}
+
+VLIB_REGISTER_NODE (nat44_out2in_reass_node) = {
+ .function = nat44_out2in_reass_node_fn,
+ .name = "nat44-out2in-reass",
+ .vector_size = sizeof (u32),
+ .format_trace = format_nat44_out2in_reass_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+
+ .n_errors = ARRAY_LEN(snat_out2in_error_strings),
+ .error_strings = snat_out2in_error_strings,
+
+ .n_next_nodes = SNAT_OUT2IN_N_NEXT,
+
+ /* edit / add dispositions here */
+ .next_nodes = {
+ [SNAT_OUT2IN_NEXT_DROP] = "error-drop",
+ [SNAT_OUT2IN_NEXT_LOOKUP] = "ip4-lookup",
+ [SNAT_OUT2IN_NEXT_ICMP_ERROR] = "ip4-icmp-error",
+ [SNAT_OUT2IN_NEXT_REASS] = "nat44-out2in-reass",
+ },
+};
+VLIB_NODE_FUNCTION_MULTIARCH (nat44_out2in_reass_node,
+ nat44_out2in_reass_node_fn);
+
/**************************/
/*** deterministic mode ***/
/**************************/
@@ -2017,6 +2347,7 @@ VLIB_REGISTER_NODE (snat_det_out2in_node) = {
[SNAT_OUT2IN_NEXT_DROP] = "error-drop",
[SNAT_OUT2IN_NEXT_LOOKUP] = "ip4-lookup",
[SNAT_OUT2IN_NEXT_ICMP_ERROR] = "ip4-icmp-error",
+ [SNAT_OUT2IN_NEXT_REASS] = "nat44-out2in-reass",
},
};
VLIB_NODE_FUNCTION_MULTIARCH (snat_det_out2in_node, snat_det_out2in_node_fn);
@@ -2509,6 +2840,7 @@ VLIB_REGISTER_NODE (snat_out2in_fast_node) = {
[SNAT_OUT2IN_NEXT_LOOKUP] = "ip4-lookup",
[SNAT_OUT2IN_NEXT_DROP] = "error-drop",
[SNAT_OUT2IN_NEXT_ICMP_ERROR] = "ip4-icmp-error",
+ [SNAT_OUT2IN_NEXT_REASS] = "nat44-out2in-reass",
},
};
VLIB_NODE_FUNCTION_MULTIARCH (snat_out2in_fast_node, snat_out2in_fast_node_fn);