/* * 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 <nat/nat64.h> #include <nat/nat_reass.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; } 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; vlib_node_registration_t nat64_in2out_handoff_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") 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_NEXT_REASS, NAT64_IN2OUT_N_NEXT, } nat64_in2out_next_t; typedef struct nat64_in2out_set_ctx_t_ { vlib_buffer_t *b; vlib_main_t *vm; u32 thread_index; } 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; nat64_db_t *db = &nm->db[ctx->thread_index]; 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 (db, &saddr, &daddr, sport, dport, proto, fib_index, 1); if (ste) { bibe = nat64_db_bib_entry_by_index (db, proto, ste->bibe_index); if (!bibe) return -1; } else { bibe = nat64_db_bib_entry_find (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, ctx->thread_index)) return -1; bibe = nat64_db_bib_entry_create (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 (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); nat64_db_t *db = &nm->db[ctx->thread_index]; 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 (db, &saddr, &daddr, in_id, 0, IP_PROTOCOL_ICMP, fib_index, 1); if (ste) { bibe = nat64_db_bib_entry_by_index (db, IP_PROTOCOL_ICMP, ste->bibe_index); if (!bibe) return -1; } else { bibe = nat64_db_bib_entry_find (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, ctx->thread_index)) return -1; bibe = nat64_db_bib_entry_create (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 (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; nat64_db_t *db = &nm->db[ctx->thread_index]; 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 (db, &daddr, &saddr, in_id, 0, proto, fib_index, 1); if (!ste) return -1; bibe = nat64_db_bib_entry_by_index (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 (db, &daddr, &saddr, dport, sport, proto, fib_index, 1); if (!ste) return -1; bibe = nat64_db_bib_entry_by_index (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; u32 thread_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; nat64_db_t *db = &nm->db[ctx->thread_index]; if (ip46_address_is_equal (&ste->in_r_addr, &ctx->dst_addr)) { bibe = nat64_db_bib_entry_by_index (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 (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 *s_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; nat64_db_t *db = &nm->db[s_ctx->thread_index]; sw_if_index = vnet_buffer (s_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 (db, &saddr, &daddr, 0, 0, proto, fib_index, 1); if (ste) { bibe = nat64_db_bib_entry_by_index (db, proto, ste->bibe_index); if (!bibe) return -1; } else { bibe = nat64_db_bib_entry_find (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, .thread_index = s_ctx->thread_index, }; nat64_db_st_walk (db, IP_PROTOCOL_TCP, unk_proto_st_walk, &ctx); if (!ctx.out_addr.as_u32) nat64_db_st_walk (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 (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 (db, &addr, 0, proto, 0, 0)) break; } } if (!ctx.out_addr.as_u32) return -1; bibe = nat64_db_bib_entry_create (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 (db, bibe, &ip6->dst_address, &daddr.ip4, 0); if (!ste) return -1; } nat64_session_reset_timeout (ste, s_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, u32 thread_index) { 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; nat64_db_t *db = &nm->db[thread_index]; 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 (db, &saddr, &daddr, sport, dport, proto, fib_index, 1); if (ste) { bibe = nat64_db_bib_entry_by_index (db, proto, ste->bibe_index); if (!bibe) return -1; } else { bibe = nat64_db_bib_entry_find (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, thread_index)) return -1; bibe = nat64_db_bib_entry_create (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 (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 (&daddr, 0, sizeof (daddr)); daddr.ip4.as_u32 = ste->out_r_addr.as_u32; bibe = 0; /* *INDENT-OFF* */ vec_foreach (db, nm->db) { bibe = nat64_db_bib_entry_find (db, &daddr, dport, proto, 0, 0); if (bibe) break; } /* *INDENT-ON* */ if (!bibe) return -1; ip6->dst_address.as_u64[0] = bibe->in_addr.as_u64[0]; ip6->dst_address.as_u64[1] = bibe->in_addr.as_u64[1]; 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, u32 thread_index) { 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; nat64_db_t *db = &nm->db[thread_index]; 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 (db, &daddr, &saddr, dport, sport, proto, fib_index, 1); if (!ste) return -1; bibe = nat64_db_bib_entry_by_index (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 = 0; /* *INDENT-OFF* */ vec_foreach (db, nm->db) { ste = nat64_db_st_entry_find (db, &saddr, &daddr, sport, dport, proto, 0, 0); if (ste) break; } /* *INDENT-ON* */ if (!ste) return -1; bibe = nat64_db_bib_entry_by_index (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, u32 thread_index) { 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; nat64_db_t *db = &nm->db[thread_index]; 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 (db, &saddr, &daddr, 0, 0, proto, fib_index, 1); if (ste) { bibe = nat64_db_bib_entry_by_index (db, proto, ste->bibe_index); if (!bibe) return -1; } else { bibe = nat64_db_bib_entry_find (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, .thread_index = thread_index, }; nat64_db_st_walk (db, IP_PROTOCOL_TCP, unk_proto_st_walk, &ctx); if (!ctx.out_addr.as_u32) nat64_db_st_walk (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 (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 (db, &addr, 0, proto, 0, 0)) break; } } if (!ctx.out_addr.as_u32) return -1; bibe = nat64_db_bib_entry_create (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 (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 (&daddr, 0, sizeof (daddr)); daddr.ip4.as_u32 = ste->out_r_addr.as_u32; bibe = 0; /* *INDENT-OFF* */ vec_foreach (db, nm->db) { bibe = nat64_db_bib_entry_find (db, &daddr, 0, proto, 0, 0); if (bibe) break; } /* *INDENT-ON* */ if (!bibe) return -1; ip6->dst_address.as_u64[0] = bibe->in_addr.as_u64[0]; ip6->dst_address.as_u64[1] = bibe->in_addr.as_u64[1]; 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; u32 thread_index = vlib_get_thread_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; ctx0.thread_index = thread_index; 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 (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, thread_index)) { 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 (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)) { next0 = NAT64_IN2OUT_NEXT_IP6_LOOKUP; if (nat64_in2out_icmp_hairpinning (vm, b0, ip60, thread_index)) { 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, thread_index)) { 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", [NAT64_IN2OUT_NEXT_REASS] = "nat64-in2out-reass", }, }; /* *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", [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; u32 thread_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; nat64_db_t *db = &nm->db[ctx->thread_index]; ste = nat64_db_st_entry_by_index (db, ctx->proto, ctx->sess_index); if (!ste) return -1; bibe = nat64_db_bib_entry_by_index (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 daddr; nat64_db_t *db = &nm->db[ctx->thread_index]; 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 (db, ctx->proto, ctx->sess_index); if (!ste) return -1; bibe = nat64_db_bib_entry_by_index (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 (&daddr, 0, sizeof (daddr)); daddr.ip4.as_u32 = ste->out_r_addr.as_u32; bibe = 0; /* *INDENT-OFF* */ vec_foreach (db, nm->db) { bibe = nat64_db_bib_entry_find (db, &daddr, dport, ctx->proto, 0, 0); if (bibe) break; } /* *INDENT-ON* */ if (!bibe) return -1; ip6->dst_address.as_u64[0] = bibe->in_addr.as_u64[0]; ip6->dst_address.as_u64[1] = bibe->in_addr.as_u64[1]; 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; u32 thread_index = vlib_get_thread_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; 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; nat64_db_t *db = &nm->db[thread_index]; /* 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); ctx0.thread_index = thread_index; 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 (db, &saddr0, &daddr0, udp0->src_port, udp0->dst_port, l4_protocol0, fib_index0, 1); if (!ste0) { bibe0 = nat64_db_bib_entry_find (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, thread_index)) { next0 = NAT64_IN2OUT_NEXT_DROP; b0->error = node->errors[NAT64_IN2OUT_ERROR_NO_TRANSLATION]; goto trace0; } bibe0 = nat64_db_bib_entry_create (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 (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 (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); typedef struct { u32 next_worker_index; u8 do_handoff; } nat64_in2out_handoff_trace_t; static u8 * format_nat64_in2out_handoff_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_handoff_trace_t *t = va_arg (*args, nat64_in2out_handoff_trace_t *); char *m; m = t->do_handoff ? "next worker" : "same worker"; s = format (s, "NAT64-IN2OUT-HANDOFF: %s %d", m, t->next_worker_index); return s; } static inline uword nat64_in2out_handoff_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { nat64_main_t *nm = &nat64_main; vlib_thread_main_t *tm = vlib_get_thread_main (); u32 n_left_from, *from, *to_next = 0, *to_next_drop = 0; static __thread vlib_frame_queue_elt_t **handoff_queue_elt_by_worker_index; static __thread vlib_frame_queue_t **congested_handoff_queue_by_worker_index = 0; vlib_frame_queue_elt_t *hf = 0; vlib_frame_queue_t *fq; vlib_frame_t *f = 0, *d = 0; int i; u32 n_left_to_next_worker = 0, *to_next_worker = 0; u32 next_worker_index = 0; u32 current_worker_index = ~0; u32 thread_index = vlib_get_thread_index (); u32 fq_index; u32 to_node_index; fq_index = nm->fq_in2out_index; to_node_index = nat64_in2out_node.index; if (PREDICT_FALSE (handoff_queue_elt_by_worker_index == 0)) { vec_validate (handoff_queue_elt_by_worker_index, tm->n_vlib_mains - 1); vec_validate_init_empty (congested_handoff_queue_by_worker_index, tm->n_vlib_mains - 1, (vlib_frame_queue_t *) (~0)); } from = vlib_frame_vector_args (frame); n_left_from = frame->n_vectors; while (n_left_from > 0) { u32 bi0; vlib_buffer_t *b0; ip6_header_t *ip0; u8 do_handoff; bi0 = from[0]; from += 1; n_left_from -= 1; b0 = vlib_get_buffer (vm, bi0); ip0 = vlib_buffer_get_current (b0); next_worker_index = nat64_get_worker_in2out (&ip0->src_address); if (PREDICT_FALSE (next_worker_index != thread_index)) { do_handoff = 1; if (next_worker_index != current_worker_index) { fq = is_vlib_frame_queue_congested (fq_index, next_worker_index, 30, congested_handoff_queue_by_worker_index); if (fq) { /* if this is 1st frame */ if (!d) { d = vlib_get_frame_to_node (vm, nm->error_node_index); to_next_drop = vlib_frame_vector_args (d); } to_next_drop[0] = bi0; to_next_drop += 1; d->n_vectors++; goto trace0; } if (hf) hf->n_vectors = VLIB_FRAME_SIZE - n_left_to_next_worker; hf = vlib_get_worker_handoff_queue_elt (fq_index, next_worker_index, handoff_queue_elt_by_worker_index); n_left_to_next_worker = VLIB_FRAME_SIZE - hf->n_vectors; to_next_worker = &hf->buffer_index[hf->n_vectors]; current_worker_index = next_worker_index; } ASSERT (to_next_worker != 0); /* enqueue to correct worker thread */ to_next_worker[0] = bi0; to_next_worker++; n_left_to_next_worker--; if (n_left_to_next_worker == 0) { hf->n_vectors = VLIB_FRAME_SIZE; vlib_put_frame_queue_elt (hf); current_worker_index = ~0; handoff_queue_elt_by_worker_index[next_worker_index] = 0; hf = 0; } } else { do_handoff = 0; /* if this is 1st frame */ if (!f) { f = vlib_get_frame_to_node (vm, to_node_index); to_next = vlib_frame_vector_args (f); } to_next[0] = bi0; to_next += 1; f->n_vectors++; } trace0: if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && (b0->flags & VLIB_BUFFER_IS_TRACED))) { nat64_in2out_handoff_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); t->next_worker_index = next_worker_index; t->do_handoff = do_handoff; } } if (f) vlib_put_frame_to_node (vm, to_node_index, f); if (d) vlib_put_frame_to_node (vm, nm->error_node_index, d); if (hf) hf->n_vectors = VLIB_FRAME_SIZE - n_left_to_next_worker; /* Ship frames to the worker nodes */ for (i = 0; i < vec_len (handoff_queue_elt_by_worker_index); i++) { if (handoff_queue_elt_by_worker_index[i]) { hf = handoff_queue_elt_by_worker_index[i]; /* * It works better to let the handoff node * rate-adapt, always ship the handoff queue element. */ if (1 || hf->n_vectors == hf->last_n_vectors) { vlib_put_frame_queue_elt (hf); handoff_queue_elt_by_worker_index[i] = 0; } else hf->last_n_vectors = hf->n_vectors; } congested_handoff_queue_by_worker_index[i] = (vlib_frame_queue_t *) (~0); } hf = 0; current_worker_index = ~0; return frame->n_vectors; } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (nat64_in2out_handoff_node) = { .function = nat64_in2out_handoff_node_fn, .name = "nat64-in2out-handoff", .vector_size = sizeof (u32), .format_trace = format_nat64_in2out_handoff_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_next_nodes = 1, .next_nodes = { [0] = "error-drop", }, }; /* *INDENT-ON* */ VLIB_NODE_FUNCTION_MULTIARCH (nat64_in2out_handoff_node, nat64_in2out_handoff_node_fn); /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */