diff options
author | Ole Troan <ot@cisco.com> | 2016-01-13 22:30:43 +0100 |
---|---|---|
committer | Ole Trøan <ot@cisco.com> | 2016-01-14 10:01:03 +0000 |
commit | 9fb87553bec802552f09818c8fa2eab82c5eae92 (patch) | |
tree | 759b3af7968e02c764a0e5db775564e65c9c0fb5 /vnet/vnet/map | |
parent | 92eade1be5b4eefc71481bb4c7044d3ded243b5e (diff) |
Dual loop decrement TTL.
Outer fragmentation.
ICMP PMTUD.
Add DF ignore knob.
Change-Id: Icfd7b5c5d9629db3b8130ba15dc6c9a5e709d23b
Signed-off-by: Ole Troan <ot@cisco.com>
Diffstat (limited to 'vnet/vnet/map')
-rw-r--r-- | vnet/vnet/map/ip4_map.c | 54 | ||||
-rw-r--r-- | vnet/vnet/map/map.c | 72 | ||||
-rw-r--r-- | vnet/vnet/map/map.h | 31 |
3 files changed, 124 insertions, 33 deletions
diff --git a/vnet/vnet/map/ip4_map.c b/vnet/vnet/map/ip4_map.c index 343b57d210f..7b9b3ed9d89 100644 --- a/vnet/vnet/map/ip4_map.c +++ b/vnet/vnet/map/ip4_map.c @@ -27,8 +27,10 @@ enum ip4_map_next_e { #ifdef MAP_SKIP_IP6_LOOKUP IP4_MAP_NEXT_IP6_REWRITE, #endif - IP4_MAP_NEXT_FRAGMENT, + IP4_MAP_NEXT_IP4_FRAGMENT, + IP4_MAP_NEXT_IP6_FRAGMENT, IP4_MAP_NEXT_REASS, + IP4_MAP_NEXT_ICMP_ERROR, IP4_MAP_NEXT_DROP, IP4_MAP_N_NEXT, }; @@ -177,6 +179,27 @@ ip4_map_decrement_ttl (ip4_header_t *ip, u8 *error) ASSERT (ip->checksum == ip4_header_checksum(ip)); } +static u32 +ip4_map_fragment (vlib_buffer_t *b, u16 mtu, bool df, u8 *error) +{ + map_main_t *mm = &map_main; + + if (mm->frag_inner) { + ip_frag_set_vnet_buffer(b, sizeof(ip6_header_t), mtu, IP4_FRAG_NEXT_IP6_LOOKUP, IP_FRAG_FLAG_IP6_HEADER); + return (IP4_MAP_NEXT_IP4_FRAGMENT); + } else { + if (df && !mm->frag_ignore_df) { + icmp4_error_set_vnet_buffer(b, ICMP4_destination_unreachable, + ICMP4_destination_unreachable_fragmentation_needed_and_dont_fragment_set, mtu); + vlib_buffer_advance(b, sizeof(ip6_header_t)); + *error = MAP_ERROR_DF_SET; + return (IP4_MAP_NEXT_ICMP_ERROR); + } + ip_frag_set_vnet_buffer(b, 0, mtu, IP6_FRAG_NEXT_IP6_LOOKUP, IP_FRAG_FLAG_IP6_HEADER); + return (IP4_MAP_NEXT_IP6_FRAGMENT); + } +} + /* * ip4_map */ @@ -247,6 +270,12 @@ ip4_map (vlib_main_t *vm, port0 = ip4_map_port_and_security_check(d0, ip40, &next0, &error0); port1 = ip4_map_port_and_security_check(d1, ip41, &next1, &error1); + /* Decrement IPv4 TTL */ + ip4_map_decrement_ttl(ip40, &error0); + ip4_map_decrement_ttl(ip41, &error1); + bool df0 = ip40->flags_and_fragment_offset & clib_host_to_net_u16(IP4_HEADER_FLAG_DONT_FRAGMENT); + bool df1 = ip41->flags_and_fragment_offset & clib_host_to_net_u16(IP4_HEADER_FLAG_DONT_FRAGMENT); + /* MAP calc */ u32 da40 = clib_net_to_host_u32(ip40->dst_address.as_u32); u32 da41 = clib_net_to_host_u32(ip41->dst_address.as_u32); @@ -288,11 +317,7 @@ ip4_map (vlib_main_t *vm, */ if (PREDICT_TRUE(error0 == MAP_ERROR_NONE)) { if (PREDICT_FALSE(d0->mtu && (clib_net_to_host_u16(ip6h0->payload_length) + sizeof(*ip6h0) > d0->mtu))) { - vnet_buffer(p0)->ip_frag.header_offset = sizeof(*ip6h0); - vnet_buffer(p0)->ip_frag.next_index = IP4_FRAG_NEXT_IP6_LOOKUP; - vnet_buffer(p0)->ip_frag.mtu = d0->mtu; - vnet_buffer(p0)->ip_frag.flags = IP_FRAG_FLAG_IP6_HEADER; - next0 = IP4_MAP_NEXT_FRAGMENT; + next0 = ip4_map_fragment(p0, d0->mtu, df0, &error0); } else { next0 = ip4_map_ip6_lookup_bypass(p0, ip40) ? IP4_MAP_NEXT_IP6_REWRITE : next0; vlib_increment_combined_counter(cm + MAP_DOMAIN_COUNTER_TX, cpu_index, map_domain_index0, 1, @@ -308,11 +333,7 @@ ip4_map (vlib_main_t *vm, */ if (PREDICT_TRUE(error1 == MAP_ERROR_NONE)) { if (PREDICT_FALSE(d1->mtu && (clib_net_to_host_u16(ip6h1->payload_length) + sizeof(*ip6h1) > d1->mtu))) { - vnet_buffer(p1)->ip_frag.header_offset = sizeof(*ip6h1); - vnet_buffer(p1)->ip_frag.next_index = IP4_FRAG_NEXT_IP6_LOOKUP; - vnet_buffer(p1)->ip_frag.mtu = d1->mtu; - vnet_buffer(p1)->ip_frag.flags = IP_FRAG_FLAG_IP6_HEADER; - next1 = IP4_MAP_NEXT_FRAGMENT; + next1 = ip4_map_fragment(p1, d1->mtu, df1, &error1); } else { next1 = ip4_map_ip6_lookup_bypass(p1, ip41) ? IP4_MAP_NEXT_IP6_REWRITE : next1; vlib_increment_combined_counter(cm + MAP_DOMAIN_COUNTER_TX, cpu_index, map_domain_index1, 1, @@ -369,6 +390,7 @@ ip4_map (vlib_main_t *vm, /* Decrement IPv4 TTL */ ip4_map_decrement_ttl(ip40, &error0); + bool df0 = ip40->flags_and_fragment_offset & clib_host_to_net_u16(IP4_HEADER_FLAG_DONT_FRAGMENT); /* MAP calc */ u32 da40 = clib_net_to_host_u32(ip40->dst_address.as_u32); @@ -396,11 +418,7 @@ ip4_map (vlib_main_t *vm, */ if (PREDICT_TRUE(error0 == MAP_ERROR_NONE)) { if (PREDICT_FALSE(d0->mtu && (clib_net_to_host_u16(ip6h0->payload_length) + sizeof(*ip6h0) > d0->mtu))) { - vnet_buffer(p0)->ip_frag.header_offset = sizeof(*ip6h0); - vnet_buffer(p0)->ip_frag.next_index = IP4_FRAG_NEXT_IP6_LOOKUP; - vnet_buffer(p0)->ip_frag.mtu = d0->mtu; - vnet_buffer(p0)->ip_frag.flags = IP_FRAG_FLAG_IP6_HEADER; - next0 = IP4_MAP_NEXT_FRAGMENT; + next0 = ip4_map_fragment(p0, d0->mtu, df0, &error0); } else { next0 = ip4_map_ip6_lookup_bypass(p0, ip40) ? IP4_MAP_NEXT_IP6_REWRITE : next0; vlib_increment_combined_counter(cm + MAP_DOMAIN_COUNTER_TX, cpu_index, map_domain_index0, 1, @@ -591,8 +609,10 @@ VLIB_REGISTER_NODE(ip4_map_node) = { #ifdef MAP_SKIP_IP6_LOOKUP [IP4_MAP_NEXT_IP6_REWRITE] = "ip6-rewrite", #endif - [IP4_MAP_NEXT_FRAGMENT] = "ip4-frag", + [IP4_MAP_NEXT_IP4_FRAGMENT] = "ip4-frag", + [IP4_MAP_NEXT_IP6_FRAGMENT] = "ip6-frag", [IP4_MAP_NEXT_REASS] = "ip4-map-reass", + [IP4_MAP_NEXT_ICMP_ERROR] = "ip4-icmp-error", [IP4_MAP_NEXT_DROP] = "error-drop", }, }; diff --git a/vnet/vnet/map/map.c b/vnet/vnet/map/map.c index eb5496b8829..a63122b58f3 100644 --- a/vnet/vnet/map/map.c +++ b/vnet/vnet/map/map.c @@ -653,6 +653,58 @@ map_icmp_unreachables_command_fn (vlib_main_t *vm, } static clib_error_t * +map_fragment_command_fn (vlib_main_t *vm, + unformat_input_t *input, + vlib_cli_command_t *cmd) +{ + unformat_input_t _line_input, *line_input = &_line_input; + map_main_t *mm = &map_main; + + /* Get a line of input. */ + if (!unformat_user(input, unformat_line_input, line_input)) + return 0; + + while (unformat_check_input(line_input) != UNFORMAT_END_OF_INPUT) { + if (unformat(line_input, "inner")) + mm->frag_inner = true; + else if (unformat(line_input, "outer")) + mm->frag_inner = false; + else + return clib_error_return(0, "unknown input `%U'", + format_unformat_error, input); + } + unformat_free(line_input); + + return 0; +} + +static clib_error_t * +map_fragment_df_command_fn (vlib_main_t *vm, + unformat_input_t *input, + vlib_cli_command_t *cmd) +{ + unformat_input_t _line_input, *line_input = &_line_input; + map_main_t *mm = &map_main; + + /* Get a line of input. */ + if (!unformat_user(input, unformat_line_input, line_input)) + return 0; + + while (unformat_check_input(line_input) != UNFORMAT_END_OF_INPUT) { + if (unformat(line_input, "on")) + mm->frag_ignore_df = true; + else if (unformat(line_input, "off")) + mm->frag_ignore_df = false; + else + return clib_error_return(0, "unknown input `%U'", + format_unformat_error, input); + } + unformat_free(line_input); + + return 0; +} + +static clib_error_t * map_traffic_class_command_fn (vlib_main_t *vm, unformat_input_t *input, vlib_cli_command_t *cmd) @@ -869,6 +921,8 @@ show_map_stats_command_fn (vlib_main_t *vm, unformat_input_t *input, vlib_cli_co vlib_cli_output(vm, "ICMP-relay IPv4 source address: %U\n", format_ip4_address, &mm->icmp4_src_address); vlib_cli_output(vm, "ICMP6 unreachables sent for unmatched packets: %s\n", mm->icmp6_enabled ? "enabled" : "disabled"); + vlib_cli_output(vm, "Inner fragmentation: %s\n", mm->frag_inner ? "enabled" : "disabled"); + vlib_cli_output(vm, "Fragment packets regardless of DF flag: %s\n", mm->frag_ignore_df ? "enabled" : "disabled"); /* * Counters @@ -1563,11 +1617,23 @@ VLIB_CLI_COMMAND(map_icmp_relay_source_address_command, static) = { }; VLIB_CLI_COMMAND(map_icmp_unreachables_command, static) = { - .path = "map params icmp unreachables", + .path = "map params icmp6 unreachables", .short_help = "unreachables {on|off}", .function = map_icmp_unreachables_command_fn, }; +VLIB_CLI_COMMAND(map_fragment_command, static) = { + .path = "map params fragment", + .short_help = "[inner|outer] [ignore-df [on|off]]", + .function = map_fragment_command_fn, +}; + +VLIB_CLI_COMMAND(map_fragment_df_command, static) = { + .path = "map params fragment ignore-df", + .short_help = "on|off", + .function = map_fragment_df_command_fn, +}; + VLIB_CLI_COMMAND(map_security_check_frag_command, static) = { .path = "map params security-check fragments", .short_help = @@ -1639,6 +1705,10 @@ clib_error_t *map_init (vlib_main_t *vm) /* ICMP6 Type 1, Code 5 for security check failure */ mm->icmp6_enabled = false; + /* Inner or outer fragmentation */ + mm->frag_inner = false; + mm->frag_ignore_df = false; + vec_validate(mm->domain_counters, MAP_N_DOMAIN_COUNTER - 1); mm->domain_counters[MAP_DOMAIN_COUNTER_RX].name = "rx"; mm->domain_counters[MAP_DOMAIN_COUNTER_TX].name = "tx"; diff --git a/vnet/vnet/map/map.h b/vnet/vnet/map/map.h index 6d12b71be2b..d38d7f47241 100644 --- a/vnet/vnet/map/map.h +++ b/vnet/vnet/map/map.h @@ -190,9 +190,6 @@ typedef struct { vlib_combined_counter_main_t *domain_counters; volatile u32 *counter_lock; - /* Global counters */ - vlib_simple_counter_main_t icmp_relayed; - #ifdef MAP_SKIP_IP6_LOOKUP /* pre-presolve */ u32 adj6_index, adj4_index; @@ -203,12 +200,14 @@ typedef struct { /* Traffic class: zero, copy (~0) or fixed value */ u8 tc; bool tc_copy; - bool sec_check; - bool sec_check_frag; - bool icmp6_enabled; + + bool sec_check; /* Inbound security check */ + bool sec_check_frag; /* Inbound security check for (subsequent) fragments */ + bool icmp6_enabled; /* Send destination unreachable for security check failure */ /* ICMPv6 -> ICMPv4 relay parameters */ ip4_address_t icmp4_src_address; + vlib_simple_counter_main_t icmp_relayed; /* convenience */ vlib_main_t *vlib_main; @@ -217,13 +216,13 @@ typedef struct { /* * IPv4 encap and decap reassembly */ - //Conf + /* Configuration */ f32 ip4_reass_conf_ht_ratio; //Size of ht is 2^ceil(log2(ratio*pool_size)) u16 ip4_reass_conf_pool_size; //Max number of allocated reass structures u16 ip4_reass_conf_lifetime_ms; //Time a reassembly struct is considered valid in ms u32 ip4_reass_conf_buffers; //Maximum number of buffers used by ip4 reassembly - //Runtime + /* Runtime */ map_ip4_reass_t *ip4_reass_pool; u8 ip4_reass_ht_log2len; //Hash table size is 2^log2len u16 ip4_reass_allocated; @@ -231,19 +230,22 @@ typedef struct { u16 ip4_reass_fifo_last; volatile u32 *ip4_reass_lock; - //Counters + /* Counters */ u32 ip4_reass_buffered_counter; + bool frag_inner; /* Inner or outer fragmentation */ + bool frag_ignore_df; /* Fragment (outer) packet even if DF is set */ + /* * IPv6 decap reassembly */ - //Conf + /* Configuration */ f32 ip6_reass_conf_ht_ratio; //Size of ht is 2^ceil(log2(ratio*pool_size)) u16 ip6_reass_conf_pool_size; //Max number of allocated reass structures u16 ip6_reass_conf_lifetime_ms; //Time a reassembly struct is considered valid in ms u32 ip6_reass_conf_buffers; //Maximum number of buffers used by ip6 reassembly - //Runtime + /* Runtime */ map_ip6_reass_t *ip6_reass_pool; u8 ip6_reass_ht_log2len; //Hash table size is 2^log2len u16 ip6_reass_allocated; @@ -251,19 +253,18 @@ typedef struct { u16 ip6_reass_fifo_last; volatile u32 *ip6_reass_lock; - //Counters + /* Counters */ u32 ip6_reass_buffered_counter; } map_main_t; /* - * TODO: Remove SEC_CHECK / TRANSLATED_4TO6 / TRANSLATED_6TO4 + * MAP Error counters/messages */ #define foreach_map_error \ /* Must be first. */ \ _(NONE, "valid MAP packets") \ _(BAD_PROTOCOL, "bad protocol") \ - _(WRONG_ICMP_TYPE, "wrong icmp type") \ _(SEC_CHECK, "security check failed") \ _(ENCAP_SEC_CHECK, "encap security check failed") \ _(DECAP_SEC_CHECK, "decap security check failed") \ @@ -277,7 +278,7 @@ typedef struct { _(FRAGMENT_MALFORMED, "fragment has unexpected format")\ _(FRAGMENT_DROPPED, "dropped cached fragment") \ _(MALFORMED, "malformed packet") \ - _(IP4_ERROR_TIME_EXPIRED, "time expired") + _(DF_SET, "can't fragment, DF set") typedef enum { #define _(sym,str) MAP_ERROR_##sym, |