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-rw-r--r--src/plugins/snat/nat64_in2out.c1118
1 files changed, 0 insertions, 1118 deletions
diff --git a/src/plugins/snat/nat64_in2out.c b/src/plugins/snat/nat64_in2out.c
deleted file mode 100644
index 8c67fec2b29..00000000000
--- a/src/plugins/snat/nat64_in2out.c
+++ /dev/null
@@ -1,1118 +0,0 @@
-/*
- * 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 NAT64 IPv6 to IPv4 translation (inside to outside network)
- */
-
-#include <snat/nat64.h>
-#include <vnet/ip/ip6_to_ip4.h>
-#include <vnet/fib/fib_table.h>
-
-typedef struct
-{
- u32 sw_if_index;
- u32 next_index;
- u8 is_slow_path;
-} nat64_in2out_trace_t;
-
-static u8 *
-format_nat64_in2out_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_trace_t *t = va_arg (*args, nat64_in2out_trace_t *);
- char *tag;
-
- tag = t->is_slow_path ? "NAT64-in2out-slowpath" : "NAT64-in2out";
-
- s =
- format (s, "%s: sw_if_index %d, next index %d", tag, t->sw_if_index,
- t->next_index);
-
- return s;
-}
-
-vlib_node_registration_t nat64_in2out_node;
-vlib_node_registration_t nat64_in2out_slowpath_node;
-
-#define foreach_nat64_in2out_error \
-_(UNSUPPORTED_PROTOCOL, "unsupported protocol") \
-_(IN2OUT_PACKETS, "good in2out packets processed") \
-_(NO_TRANSLATION, "no translation") \
-_(UNKNOWN, "unknown")
-
-typedef enum
-{
-#define _(sym,str) NAT64_IN2OUT_ERROR_##sym,
- foreach_nat64_in2out_error
-#undef _
- NAT64_IN2OUT_N_ERROR,
-} nat64_in2out_error_t;
-
-static char *nat64_in2out_error_strings[] = {
-#define _(sym,string) string,
- foreach_nat64_in2out_error
-#undef _
-};
-
-typedef enum
-{
- NAT64_IN2OUT_NEXT_IP4_LOOKUP,
- NAT64_IN2OUT_NEXT_IP6_LOOKUP,
- NAT64_IN2OUT_NEXT_DROP,
- NAT64_IN2OUT_NEXT_SLOWPATH,
- NAT64_IN2OUT_N_NEXT,
-} nat64_in2out_next_t;
-
-typedef struct nat64_in2out_set_ctx_t_
-{
- vlib_buffer_t *b;
- vlib_main_t *vm;
-} nat64_in2out_set_ctx_t;
-
-/**
- * @brief Check whether is a hairpinning.
- *
- * If the destination IP address of the packet is an IPv4 address assigned to
- * the NAT64 itself, then the packet is a hairpin packet.
- *
- * param dst_addr Destination address of the packet.
- *
- * @returns 1 if hairpinning, otherwise 0.
- */
-static_always_inline int
-is_hairpinning (ip6_address_t * dst_addr)
-{
- nat64_main_t *nm = &nat64_main;
- int i;
-
- for (i = 0; i < vec_len (nm->addr_pool); i++)
- {
- if (nm->addr_pool[i].addr.as_u32 == dst_addr->as_u32[3])
- return 1;
- }
-
- return 0;
-}
-
-static int
-nat64_in2out_tcp_udp_set_cb (ip6_header_t * ip6, ip4_header_t * ip4,
- void *arg)
-{
- nat64_main_t *nm = &nat64_main;
- nat64_in2out_set_ctx_t *ctx = arg;
- nat64_db_bib_entry_t *bibe;
- nat64_db_st_entry_t *ste;
- ip46_address_t saddr, daddr;
- u32 sw_if_index, fib_index;
- udp_header_t *udp = ip6_next_header (ip6);
- u8 proto = ip6->protocol;
- u16 sport = udp->src_port;
- u16 dport = udp->dst_port;
-
- sw_if_index = vnet_buffer (ctx->b)->sw_if_index[VLIB_RX];
- fib_index =
- fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP6, sw_if_index);
-
- saddr.as_u64[0] = ip6->src_address.as_u64[0];
- saddr.as_u64[1] = ip6->src_address.as_u64[1];
- daddr.as_u64[0] = ip6->dst_address.as_u64[0];
- daddr.as_u64[1] = ip6->dst_address.as_u64[1];
-
- ste =
- nat64_db_st_entry_find (&nm->db, &saddr, &daddr, sport, dport, proto,
- fib_index, 1);
-
- if (ste)
- {
- bibe = nat64_db_bib_entry_by_index (&nm->db, proto, ste->bibe_index);
- if (!bibe)
- return -1;
- }
- else
- {
- bibe =
- nat64_db_bib_entry_find (&nm->db, &saddr, sport, proto, fib_index, 1);
-
- if (!bibe)
- {
- u16 out_port;
- ip4_address_t out_addr;
- if (nat64_alloc_out_addr_and_port
- (fib_index, ip_proto_to_snat_proto (proto), &out_addr,
- &out_port))
- return -1;
-
- bibe =
- nat64_db_bib_entry_create (&nm->db, &ip6->src_address, &out_addr,
- sport, clib_host_to_net_u16 (out_port),
- fib_index, proto, 0);
- if (!bibe)
- return -1;
- }
-
- nat64_extract_ip4 (&ip6->dst_address, &daddr.ip4, fib_index);
- ste =
- nat64_db_st_entry_create (&nm->db, bibe, &ip6->dst_address,
- &daddr.ip4, dport);
- if (!ste)
- return -1;
- }
-
- nat64_session_reset_timeout (ste, ctx->vm);
-
- ip4->src_address.as_u32 = bibe->out_addr.as_u32;
- udp->src_port = bibe->out_port;
-
- ip4->dst_address.as_u32 = ste->out_r_addr.as_u32;
-
- if (proto == IP_PROTOCOL_TCP)
- {
- u16 *checksum;
- ip_csum_t csum;
- tcp_header_t *tcp = ip6_next_header (ip6);
-
- checksum = &tcp->checksum;
- csum = ip_csum_sub_even (*checksum, sport);
- csum = ip_csum_add_even (csum, udp->src_port);
- *checksum = ip_csum_fold (csum);
- }
-
- return 0;
-}
-
-static int
-nat64_in2out_icmp_set_cb (ip6_header_t * ip6, ip4_header_t * ip4, void *arg)
-{
- nat64_main_t *nm = &nat64_main;
- nat64_in2out_set_ctx_t *ctx = arg;
- nat64_db_bib_entry_t *bibe;
- nat64_db_st_entry_t *ste;
- ip46_address_t saddr, daddr;
- u32 sw_if_index, fib_index;
- icmp46_header_t *icmp = ip6_next_header (ip6);
-
- sw_if_index = vnet_buffer (ctx->b)->sw_if_index[VLIB_RX];
- fib_index =
- fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP6, sw_if_index);
-
- saddr.as_u64[0] = ip6->src_address.as_u64[0];
- saddr.as_u64[1] = ip6->src_address.as_u64[1];
- daddr.as_u64[0] = ip6->dst_address.as_u64[0];
- daddr.as_u64[1] = ip6->dst_address.as_u64[1];
-
- if (icmp->type == ICMP4_echo_request || icmp->type == ICMP4_echo_reply)
- {
- u16 in_id = ((u16 *) (icmp))[2];
- ste =
- nat64_db_st_entry_find (&nm->db, &saddr, &daddr, in_id, 0,
- IP_PROTOCOL_ICMP, fib_index, 1);
-
- if (ste)
- {
- bibe =
- nat64_db_bib_entry_by_index (&nm->db, IP_PROTOCOL_ICMP,
- ste->bibe_index);
- if (!bibe)
- return -1;
- }
- else
- {
- bibe =
- nat64_db_bib_entry_find (&nm->db, &saddr, in_id,
- IP_PROTOCOL_ICMP, fib_index, 1);
-
- if (!bibe)
- {
- u16 out_id;
- ip4_address_t out_addr;
- if (nat64_alloc_out_addr_and_port
- (fib_index, SNAT_PROTOCOL_ICMP, &out_addr, &out_id))
- return -1;
-
- bibe =
- nat64_db_bib_entry_create (&nm->db, &ip6->src_address,
- &out_addr, in_id,
- clib_host_to_net_u16 (out_id),
- fib_index, IP_PROTOCOL_ICMP, 0);
- if (!bibe)
- return -1;
- }
-
- nat64_extract_ip4 (&ip6->dst_address, &daddr.ip4, fib_index);
- ste =
- nat64_db_st_entry_create (&nm->db, bibe, &ip6->dst_address,
- &daddr.ip4, 0);
- if (!ste)
- return -1;
- }
-
- nat64_session_reset_timeout (ste, ctx->vm);
-
- ip4->src_address.as_u32 = bibe->out_addr.as_u32;
- ((u16 *) (icmp))[2] = bibe->out_port;
-
- ip4->dst_address.as_u32 = ste->out_r_addr.as_u32;
- }
- else
- {
- if (!vec_len (nm->addr_pool))
- return -1;
-
- ip4->src_address.as_u32 = nm->addr_pool[0].addr.as_u32;
- nat64_extract_ip4 (&ip6->dst_address, &ip4->dst_address, fib_index);
- }
-
- return 0;
-}
-
-static int
-nat64_in2out_inner_icmp_set_cb (ip6_header_t * ip6, ip4_header_t * ip4,
- void *arg)
-{
- nat64_main_t *nm = &nat64_main;
- nat64_in2out_set_ctx_t *ctx = arg;
- nat64_db_st_entry_t *ste;
- nat64_db_bib_entry_t *bibe;
- ip46_address_t saddr, daddr;
- u32 sw_if_index, fib_index;
- u8 proto = ip6->protocol;
-
- sw_if_index = vnet_buffer (ctx->b)->sw_if_index[VLIB_RX];
- fib_index =
- fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP6, sw_if_index);
-
- saddr.as_u64[0] = ip6->src_address.as_u64[0];
- saddr.as_u64[1] = ip6->src_address.as_u64[1];
- daddr.as_u64[0] = ip6->dst_address.as_u64[0];
- daddr.as_u64[1] = ip6->dst_address.as_u64[1];
-
- if (proto == IP_PROTOCOL_ICMP6)
- {
- icmp46_header_t *icmp = ip6_next_header (ip6);
- u16 in_id = ((u16 *) (icmp))[2];
- proto = IP_PROTOCOL_ICMP;
-
- if (!
- (icmp->type == ICMP4_echo_request
- || icmp->type == ICMP4_echo_reply))
- return -1;
-
- ste =
- nat64_db_st_entry_find (&nm->db, &daddr, &saddr, in_id, 0, proto,
- fib_index, 1);
- if (!ste)
- return -1;
-
- bibe = nat64_db_bib_entry_by_index (&nm->db, proto, ste->bibe_index);
- if (!bibe)
- return -1;
-
- ip4->dst_address.as_u32 = bibe->out_addr.as_u32;
- ((u16 *) (icmp))[2] = bibe->out_port;
- ip4->src_address.as_u32 = ste->out_r_addr.as_u32;
- }
- else
- {
- udp_header_t *udp = ip6_next_header (ip6);
- tcp_header_t *tcp = ip6_next_header (ip6);
- u16 *checksum;
- ip_csum_t csum;
-
- u16 sport = udp->src_port;
- u16 dport = udp->dst_port;
-
- ste =
- nat64_db_st_entry_find (&nm->db, &daddr, &saddr, dport, sport, proto,
- fib_index, 1);
- if (!ste)
- return -1;
-
- bibe = nat64_db_bib_entry_by_index (&nm->db, proto, ste->bibe_index);
- if (!bibe)
- return -1;
-
- ip4->dst_address.as_u32 = bibe->out_addr.as_u32;
- udp->dst_port = bibe->out_port;
- ip4->src_address.as_u32 = ste->out_r_addr.as_u32;
-
- if (proto == IP_PROTOCOL_TCP)
- checksum = &tcp->checksum;
- else
- checksum = &udp->checksum;
- csum = ip_csum_sub_even (*checksum, dport);
- csum = ip_csum_add_even (csum, udp->dst_port);
- *checksum = ip_csum_fold (csum);
- }
-
- return 0;
-}
-
-typedef struct unk_proto_st_walk_ctx_t_
-{
- ip6_address_t src_addr;
- ip6_address_t dst_addr;
- ip4_address_t out_addr;
- u32 fib_index;
- u8 proto;
-} unk_proto_st_walk_ctx_t;
-
-static int
-unk_proto_st_walk (nat64_db_st_entry_t * ste, void *arg)
-{
- nat64_main_t *nm = &nat64_main;
- unk_proto_st_walk_ctx_t *ctx = arg;
- nat64_db_bib_entry_t *bibe;
- ip46_address_t saddr, daddr;
-
- if (ip46_address_is_equal (&ste->in_r_addr, &ctx->dst_addr))
- {
- bibe =
- nat64_db_bib_entry_by_index (&nm->db, ste->proto, ste->bibe_index);
- if (!bibe)
- return -1;
-
- if (ip46_address_is_equal (&bibe->in_addr, &ctx->src_addr)
- && bibe->fib_index == ctx->fib_index)
- {
- memset (&saddr, 0, sizeof (saddr));
- saddr.ip4.as_u32 = bibe->out_addr.as_u32;
- memset (&daddr, 0, sizeof (daddr));
- nat64_extract_ip4 (&ctx->dst_addr, &daddr.ip4, ctx->fib_index);
-
- if (nat64_db_st_entry_find
- (&nm->db, &daddr, &saddr, 0, 0, ctx->proto, ctx->fib_index, 0))
- return -1;
-
- ctx->out_addr.as_u32 = bibe->out_addr.as_u32;
- return 1;
- }
- }
-
- return 0;
-}
-
-static int
-nat64_in2out_unk_proto_set_cb (ip6_header_t * ip6, ip4_header_t * ip4,
- void *arg)
-{
- nat64_main_t *nm = &nat64_main;
- nat64_in2out_set_ctx_t *ctx = arg;
- nat64_db_bib_entry_t *bibe;
- nat64_db_st_entry_t *ste;
- ip46_address_t saddr, daddr, addr;
- u32 sw_if_index, fib_index;
- u8 proto = ip6->protocol;
- int i;
-
- sw_if_index = vnet_buffer (ctx->b)->sw_if_index[VLIB_RX];
- fib_index =
- fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP6, sw_if_index);
-
- saddr.as_u64[0] = ip6->src_address.as_u64[0];
- saddr.as_u64[1] = ip6->src_address.as_u64[1];
- daddr.as_u64[0] = ip6->dst_address.as_u64[0];
- daddr.as_u64[1] = ip6->dst_address.as_u64[1];
-
- ste =
- nat64_db_st_entry_find (&nm->db, &saddr, &daddr, 0, 0, proto, fib_index,
- 1);
-
- if (ste)
- {
- bibe = nat64_db_bib_entry_by_index (&nm->db, proto, ste->bibe_index);
- if (!bibe)
- return -1;
- }
- else
- {
- bibe =
- nat64_db_bib_entry_find (&nm->db, &saddr, 0, proto, fib_index, 1);
-
- if (!bibe)
- {
- /* Choose same out address as for TCP/UDP session to same dst */
- unk_proto_st_walk_ctx_t ctx = {
- .src_addr.as_u64[0] = ip6->src_address.as_u64[0],
- .src_addr.as_u64[1] = ip6->src_address.as_u64[1],
- .dst_addr.as_u64[0] = ip6->dst_address.as_u64[0],
- .dst_addr.as_u64[1] = ip6->dst_address.as_u64[1],
- .out_addr.as_u32 = 0,
- .fib_index = fib_index,
- .proto = proto,
- };
-
- nat64_db_st_walk (&nm->db, IP_PROTOCOL_TCP, unk_proto_st_walk,
- &ctx);
-
- if (!ctx.out_addr.as_u32)
- nat64_db_st_walk (&nm->db, IP_PROTOCOL_UDP, unk_proto_st_walk,
- &ctx);
-
- /* Verify if out address is not already in use for protocol */
- memset (&addr, 0, sizeof (addr));
- addr.ip4.as_u32 = ctx.out_addr.as_u32;
- if (nat64_db_bib_entry_find (&nm->db, &addr, 0, proto, 0, 0))
- ctx.out_addr.as_u32 = 0;
-
- if (!ctx.out_addr.as_u32)
- {
- for (i = 0; i < vec_len (nm->addr_pool); i++)
- {
- addr.ip4.as_u32 = nm->addr_pool[i].addr.as_u32;
- if (!nat64_db_bib_entry_find
- (&nm->db, &addr, 0, proto, 0, 0))
- break;
- }
- }
-
- if (!ctx.out_addr.as_u32)
- return -1;
-
- bibe =
- nat64_db_bib_entry_create (&nm->db, &ip6->src_address,
- &ctx.out_addr, 0, 0, fib_index, proto,
- 0);
- if (!bibe)
- return -1;
- }
-
- nat64_extract_ip4 (&ip6->dst_address, &daddr.ip4, fib_index);
- ste =
- nat64_db_st_entry_create (&nm->db, bibe, &ip6->dst_address,
- &daddr.ip4, 0);
- if (!ste)
- return -1;
- }
-
- nat64_session_reset_timeout (ste, ctx->vm);
-
- 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_tcp_udp_hairpinning (vlib_main_t * vm, vlib_buffer_t * b,
- ip6_header_t * ip6)
-{
- nat64_main_t *nm = &nat64_main;
- nat64_db_bib_entry_t *bibe;
- nat64_db_st_entry_t *ste;
- ip46_address_t saddr, daddr;
- u32 sw_if_index, fib_index;
- udp_header_t *udp = ip6_next_header (ip6);
- tcp_header_t *tcp = ip6_next_header (ip6);
- u8 proto = ip6->protocol;
- u16 sport = udp->src_port;
- u16 dport = udp->dst_port;
- u16 *checksum;
- ip_csum_t csum;
-
- sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
- fib_index =
- fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP6, sw_if_index);
-
- saddr.as_u64[0] = ip6->src_address.as_u64[0];
- saddr.as_u64[1] = ip6->src_address.as_u64[1];
- daddr.as_u64[0] = ip6->dst_address.as_u64[0];
- daddr.as_u64[1] = ip6->dst_address.as_u64[1];
-
- if (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_find (&nm->db, &saddr, &daddr, sport, dport, proto,
- fib_index, 1);
-
- if (ste)
- {
- bibe = nat64_db_bib_entry_by_index (&nm->db, proto, ste->bibe_index);
- if (!bibe)
- return -1;
- }
- else
- {
- bibe =
- nat64_db_bib_entry_find (&nm->db, &saddr, sport, proto, fib_index, 1);
-
- if (!bibe)
- {
- u16 out_port;
- ip4_address_t out_addr;
- if (nat64_alloc_out_addr_and_port
- (fib_index, ip_proto_to_snat_proto (proto), &out_addr,
- &out_port))
- return -1;
-
- bibe =
- nat64_db_bib_entry_create (&nm->db, &ip6->src_address, &out_addr,
- sport, clib_host_to_net_u16 (out_port),
- fib_index, proto, 0);
- if (!bibe)
- return -1;
- }
-
- nat64_extract_ip4 (&ip6->dst_address, &daddr.ip4, fib_index);
- ste =
- nat64_db_st_entry_create (&nm->db, bibe, &ip6->dst_address,
- &daddr.ip4, dport);
- if (!ste)
- return -1;
- }
-
- nat64_session_reset_timeout (ste, vm);
-
- sport = udp->src_port = bibe->out_port;
- nat64_compose_ip6 (&ip6->src_address, &bibe->out_addr, 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, proto, 0,
- 0);
-
- if (ste)
- {
- bibe = nat64_db_bib_entry_by_index (&nm->db, proto, ste->bibe_index);
- if (!bibe)
- return -1;
- }
- else
- {
- bibe = nat64_db_bib_entry_find (&nm->db, &daddr, dport, 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];
- udp->dst_port = bibe->in_port;
-
- 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 int
-nat64_in2out_icmp_hairpinning (vlib_main_t * vm, vlib_buffer_t * b,
- ip6_header_t * ip6)
-{
- nat64_main_t *nm = &nat64_main;
- nat64_db_bib_entry_t *bibe;
- nat64_db_st_entry_t *ste;
- icmp46_header_t *icmp = ip6_next_header (ip6);
- ip6_header_t *inner_ip6;
- ip46_address_t saddr, daddr;
- u32 sw_if_index, fib_index;
- u8 proto;
- udp_header_t *udp;
- tcp_header_t *tcp;
- u16 *checksum, sport, dport;
- ip_csum_t csum;
-
- if (icmp->type == ICMP6_echo_request || icmp->type == ICMP6_echo_reply)
- return -1;
-
- inner_ip6 = (ip6_header_t *) u8_ptr_add (icmp, 8);
-
- proto = inner_ip6->protocol;
-
- if (proto == IP_PROTOCOL_ICMP6)
- return -1;
-
- sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
- fib_index =
- fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP6, sw_if_index);
-
- saddr.as_u64[0] = inner_ip6->src_address.as_u64[0];
- saddr.as_u64[1] = inner_ip6->src_address.as_u64[1];
- daddr.as_u64[0] = inner_ip6->dst_address.as_u64[0];
- daddr.as_u64[1] = inner_ip6->dst_address.as_u64[1];
-
- udp = ip6_next_header (inner_ip6);
- tcp = ip6_next_header (inner_ip6);
-
- sport = udp->src_port;
- dport = udp->dst_port;
-
- if (proto == IP_PROTOCOL_UDP)
- checksum = &udp->checksum;
- else
- checksum = &tcp->checksum;
-
- csum = ip_csum_sub_even (*checksum, inner_ip6->src_address.as_u64[0]);
- csum = ip_csum_sub_even (csum, inner_ip6->src_address.as_u64[1]);
- csum = ip_csum_sub_even (csum, inner_ip6->dst_address.as_u64[0]);
- csum = ip_csum_sub_even (csum, inner_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_find (&nm->db, &daddr, &saddr, dport, sport, proto,
- fib_index, 1);
- if (!ste)
- return -1;
-
- bibe = nat64_db_bib_entry_by_index (&nm->db, proto, ste->bibe_index);
- if (!bibe)
- return -1;
-
- dport = udp->dst_port = bibe->out_port;
- nat64_compose_ip6 (&inner_ip6->dst_address, &bibe->out_addr, fib_index);
-
- memset (&saddr, 0, sizeof (saddr));
- memset (&daddr, 0, sizeof (daddr));
- saddr.ip4.as_u32 = ste->out_r_addr.as_u32;
- daddr.ip4.as_u32 = bibe->out_addr.as_u32;
-
- ste =
- nat64_db_st_entry_find (&nm->db, &saddr, &daddr, sport, dport, proto, 0,
- 0);
- if (!ste)
- return -1;
-
- bibe = nat64_db_bib_entry_by_index (&nm->db, proto, ste->bibe_index);
- if (!bibe)
- return -1;
-
- inner_ip6->src_address.as_u64[0] = bibe->in_addr.as_u64[0];
- inner_ip6->src_address.as_u64[1] = bibe->in_addr.as_u64[1];
- udp->src_port = bibe->in_port;
-
- csum = ip_csum_add_even (csum, inner_ip6->src_address.as_u64[0]);
- csum = ip_csum_add_even (csum, inner_ip6->src_address.as_u64[1]);
- csum = ip_csum_add_even (csum, inner_ip6->dst_address.as_u64[0]);
- csum = ip_csum_add_even (csum, inner_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);
-
- if (!vec_len (nm->addr_pool))
- return -1;
-
- nat64_compose_ip6 (&ip6->src_address, &nm->addr_pool[0].addr, fib_index);
- ip6->dst_address.as_u64[0] = inner_ip6->src_address.as_u64[0];
- ip6->dst_address.as_u64[1] = inner_ip6->src_address.as_u64[1];
-
- icmp->checksum = 0;
- csum = ip_csum_with_carry (0, ip6->payload_length);
- csum = ip_csum_with_carry (csum, clib_host_to_net_u16 (ip6->protocol));
- csum = ip_csum_with_carry (csum, ip6->src_address.as_u64[0]);
- csum = ip_csum_with_carry (csum, ip6->src_address.as_u64[1]);
- csum = ip_csum_with_carry (csum, ip6->dst_address.as_u64[0]);
- csum = ip_csum_with_carry (csum, ip6->dst_address.as_u64[1]);
- csum =
- ip_incremental_checksum (csum, icmp,
- clib_net_to_host_u16 (ip6->payload_length));
- icmp->checksum = ~ip_csum_fold (csum);
-
- return 0;
-}
-
-static int
-nat64_in2out_unk_proto_hairpinning (vlib_main_t * vm, vlib_buffer_t * b,
- ip6_header_t * ip6)
-{
- nat64_main_t *nm = &nat64_main;
- nat64_db_bib_entry_t *bibe;
- nat64_db_st_entry_t *ste;
- ip46_address_t saddr, daddr, addr;
- u32 sw_if_index, fib_index;
- u8 proto = ip6->protocol;
- int i;
-
- sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX];
- fib_index =
- fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP6, sw_if_index);
-
- saddr.as_u64[0] = ip6->src_address.as_u64[0];
- saddr.as_u64[1] = ip6->src_address.as_u64[1];
- daddr.as_u64[0] = ip6->dst_address.as_u64[0];
- daddr.as_u64[1] = ip6->dst_address.as_u64[1];
-
- ste =
- nat64_db_st_entry_find (&nm->db, &saddr, &daddr, 0, 0, proto, fib_index,
- 1);
-
- if (ste)
- {
- bibe = nat64_db_bib_entry_by_index (&nm->db, proto, ste->bibe_index);
- if (!bibe)
- return -1;
- }
- else
- {
- bibe =
- nat64_db_bib_entry_find (&nm->db, &saddr, 0, proto, fib_index, 1);
-
- if (!bibe)
- {
- /* Choose same out address as for TCP/UDP session to same dst */
- unk_proto_st_walk_ctx_t ctx = {
- .src_addr.as_u64[0] = ip6->src_address.as_u64[0],
- .src_addr.as_u64[1] = ip6->src_address.as_u64[1],
- .dst_addr.as_u64[0] = ip6->dst_address.as_u64[0],
- .dst_addr.as_u64[1] = ip6->dst_address.as_u64[1],
- .out_addr.as_u32 = 0,
- .fib_index = fib_index,
- .proto = proto,
- };
-
- nat64_db_st_walk (&nm->db, IP_PROTOCOL_TCP, unk_proto_st_walk,
- &ctx);
-
- if (!ctx.out_addr.as_u32)
- nat64_db_st_walk (&nm->db, IP_PROTOCOL_UDP, unk_proto_st_walk,
- &ctx);
-
- /* Verify if out address is not already in use for protocol */
- memset (&addr, 0, sizeof (addr));
- addr.ip4.as_u32 = ctx.out_addr.as_u32;
- if (nat64_db_bib_entry_find (&nm->db, &addr, 0, proto, 0, 0))
- ctx.out_addr.as_u32 = 0;
-
- if (!ctx.out_addr.as_u32)
- {
- for (i = 0; i < vec_len (nm->addr_pool); i++)
- {
- addr.ip4.as_u32 = nm->addr_pool[i].addr.as_u32;
- if (!nat64_db_bib_entry_find
- (&nm->db, &addr, 0, proto, 0, 0))
- break;
- }
- }
-
- if (!ctx.out_addr.as_u32)
- return -1;
-
- bibe =
- nat64_db_bib_entry_create (&nm->db, &ip6->src_address,
- &ctx.out_addr, 0, 0, fib_index, proto,
- 0);
- if (!bibe)
- return -1;
- }
-
- nat64_extract_ip4 (&ip6->dst_address, &daddr.ip4, fib_index);
- ste =
- nat64_db_st_entry_create (&nm->db, bibe, &ip6->dst_address,
- &daddr.ip4, 0);
- if (!ste)
- return -1;
- }
-
- nat64_session_reset_timeout (ste, vm);
-
- nat64_compose_ip6 (&ip6->src_address, &bibe->out_addr, 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, 0, 0, proto, 0, 0);
-
- if (ste)
- {
- bibe = nat64_db_bib_entry_by_index (&nm->db, proto, ste->bibe_index);
- if (!bibe)
- return -1;
- }
- else
- {
- bibe = nat64_db_bib_entry_find (&nm->db, &daddr, 0, proto, 0, 0);
-
- if (!bibe)
- return -1;
-
- ste =
- nat64_db_st_entry_create (&nm->db, bibe, &ip6->src_address,
- &saddr.ip4, 0);
- }
-
- ip6->dst_address.as_u64[0] = bibe->in_addr.as_u64[0];
- ip6->dst_address.as_u64[1] = bibe->in_addr.as_u64[1];
-
- return 0;
-}
-
-static inline uword
-nat64_in2out_node_fn_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
- vlib_frame_t * frame, u8 is_slow_path)
-{
- u32 n_left_from, *from, *to_next;
- nat64_in2out_next_t next_index;
- u32 pkts_processed = 0;
- u32 stats_node_index;
-
- stats_node_index =
- is_slow_path ? nat64_in2out_slowpath_node.index : nat64_in2out_node.index;
-
- 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;
- ip6_header_t *ip60;
- u16 l4_offset0, frag_offset0;
- u8 l4_protocol0;
- u32 proto0;
- nat64_in2out_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);
- ip60 = vlib_buffer_get_current (b0);
-
- ctx0.b = b0;
- ctx0.vm = vm;
-
- next0 = NAT64_IN2OUT_NEXT_IP4_LOOKUP;
-
- 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;
- }
-
- 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_TRUE (proto0 == ~0))
- {
- if (is_hairpinning (&ip60->dst_address))
- {
- next0 = NAT64_IN2OUT_NEXT_IP6_LOOKUP;
- if (nat64_in2out_unk_proto_hairpinning (vm, b0, ip60))
- {
- next0 = NAT64_IN2OUT_NEXT_DROP;
- b0->error =
- node->errors[NAT64_IN2OUT_ERROR_NO_TRANSLATION];
- }
- goto trace0;
- }
-
- if (ip6_to_ip4 (b0, nat64_in2out_unk_proto_set_cb, &ctx0))
- {
- next0 = NAT64_IN2OUT_NEXT_DROP;
- b0->error =
- node->errors[NAT64_IN2OUT_ERROR_NO_TRANSLATION];
- goto trace0;
- }
- }
- goto trace0;
- }
- else
- {
- if (PREDICT_FALSE (proto0 == ~0))
- {
- next0 = NAT64_IN2OUT_NEXT_SLOWPATH;
- goto trace0;
- }
- }
-
- if (proto0 == SNAT_PROTOCOL_ICMP)
- {
- if (is_hairpinning (&ip60->dst_address))
- {
- next0 = NAT64_IN2OUT_NEXT_IP6_LOOKUP;
- if (nat64_in2out_icmp_hairpinning (vm, b0, ip60))
- {
- next0 = NAT64_IN2OUT_NEXT_DROP;
- b0->error =
- node->errors[NAT64_IN2OUT_ERROR_NO_TRANSLATION];
- }
- goto trace0;
- }
-
- if (icmp6_to_icmp
- (b0, nat64_in2out_icmp_set_cb, &ctx0,
- nat64_in2out_inner_icmp_set_cb, &ctx0))
- {
- next0 = NAT64_IN2OUT_NEXT_DROP;
- b0->error = node->errors[NAT64_IN2OUT_ERROR_NO_TRANSLATION];
- goto trace0;
- }
- }
- else if (proto0 == SNAT_PROTOCOL_TCP || proto0 == SNAT_PROTOCOL_UDP)
- {
- if (is_hairpinning (&ip60->dst_address))
- {
- next0 = NAT64_IN2OUT_NEXT_IP6_LOOKUP;
- if (nat64_in2out_tcp_udp_hairpinning (vm, b0, ip60))
- {
- next0 = NAT64_IN2OUT_NEXT_DROP;
- b0->error =
- node->errors[NAT64_IN2OUT_ERROR_NO_TRANSLATION];
- }
- goto trace0;
- }
-
- if (ip6_to_ip4_tcp_udp
- (b0, nat64_in2out_tcp_udp_set_cb, &ctx0, 0))
- {
- next0 = NAT64_IN2OUT_NEXT_DROP;
- b0->error = node->errors[NAT64_IN2OUT_ERROR_NO_TRANSLATION];
- goto trace0;
- }
- }
-
- trace0:
- if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
- && (b0->flags & VLIB_BUFFER_IS_TRACED)))
- {
- nat64_in2out_trace_t *t =
- vlib_add_trace (vm, node, b0, sizeof (*t));
- t->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
- t->next_index = next0;
- t->is_slow_path = is_slow_path;
- }
-
- 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);
- }
- vlib_put_next_frame (vm, node, next_index, n_left_to_next);
- }
- vlib_node_increment_counter (vm, stats_node_index,
- NAT64_IN2OUT_ERROR_IN2OUT_PACKETS,
- pkts_processed);
- return frame->n_vectors;
-}
-
-static uword
-nat64_in2out_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
- vlib_frame_t * frame)
-{
- return nat64_in2out_node_fn_inline (vm, node, frame, 0);
-}
-
-/* *INDENT-OFF* */
-VLIB_REGISTER_NODE (nat64_in2out_node) = {
- .function = nat64_in2out_node_fn,
- .name = "nat64-in2out",
- .vector_size = sizeof (u32),
- .format_trace = format_nat64_in2out_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",
- },
-};
-/* *INDENT-ON* */
-
-VLIB_NODE_FUNCTION_MULTIARCH (nat64_in2out_node, nat64_in2out_node_fn);
-
-static uword
-nat64_in2out_slowpath_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
- vlib_frame_t * frame)
-{
- return nat64_in2out_node_fn_inline (vm, node, frame, 1);
-}
-
-/* *INDENT-OFF* */
-VLIB_REGISTER_NODE (nat64_in2out_slowpath_node) = {
- .function = nat64_in2out_slowpath_node_fn,
- .name = "nat64-in2out-slowpath",
- .vector_size = sizeof (u32),
- .format_trace = format_nat64_in2out_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",
- },
-};
-/* *INDENT-ON* */
-
-VLIB_NODE_FUNCTION_MULTIARCH (nat64_in2out_slowpath_node,
- nat64_in2out_slowpath_node_fn);
-
-/*
- * fd.io coding-style-patch-verification: ON
- *
- * Local Variables:
- * eval: (c-set-style "gnu")
- * End:
- */