diff options
Diffstat (limited to 'src/plugins/snat/nat64_in2out.c')
| -rw-r--r-- | src/plugins/snat/nat64_in2out.c | 1118 |
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: - */ |