*/
#include <nat/nat64.h>
+#include <nat/nat_reass.h>
#include <vnet/ip/ip6_to_ip4.h>
#include <vnet/fib/fib_table.h>
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
{
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;
}
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)
{
}
}
+ 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))
[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* */
[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_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
*
Code Review / vpp.git / blobdiff