/* * 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 #include #include 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: */