From f126e746fc01c75bc99329d10ce9127b26b23814 Mon Sep 17 00:00:00 2001 From: Klement Sekera Date: Thu, 10 Oct 2019 09:46:06 +0000 Subject: nat: use SVR Remove NAT's implementation of shallow virtual reassembly with corresponding CLIs, APIs & tests. Replace with standalone shallow virtual reassembly provided by ipX-sv-reass* nodes. Type: refactor Change-Id: I7e6c7487a5a500d591f6871474a359e0993e59b6 Signed-off-by: Klement Sekera --- src/plugins/nat/out2in.c | 691 +++++++++++++---------------------------------- 1 file changed, 185 insertions(+), 506 deletions(-) (limited to 'src/plugins/nat/out2in.c') diff --git a/src/plugins/nat/out2in.c b/src/plugins/nat/out2in.c index 6ee126658c8..e9ca88f1d68 100755 --- a/src/plugins/nat/out2in.c +++ b/src/plugins/nat/out2in.c @@ -27,7 +27,6 @@ #include #include #include -#include #include #include #include @@ -108,7 +107,6 @@ typedef enum SNAT_OUT2IN_NEXT_DROP, SNAT_OUT2IN_NEXT_LOOKUP, SNAT_OUT2IN_NEXT_ICMP_ERROR, - SNAT_OUT2IN_NEXT_REASS, SNAT_OUT2IN_N_NEXT, } snat_out2in_next_t; @@ -267,7 +265,7 @@ create_session_for_static_mapping (snat_main_t * sm, #ifndef CLIB_MARCH_VARIANT static_always_inline - snat_out2in_error_t icmp_get_key (ip4_header_t * ip0, + snat_out2in_error_t icmp_get_key (vlib_buffer_t * b, ip4_header_t * ip0, snat_session_key_t * p_key0) { icmp46_header_t *icmp0; @@ -280,11 +278,12 @@ static_always_inline icmp0 = (icmp46_header_t *) ip4_next_header (ip0); echo0 = (icmp_echo_header_t *) (icmp0 + 1); - if (!icmp_is_error_message (icmp0)) + if (!icmp_type_is_error_message + (vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags)) { key0.protocol = SNAT_PROTOCOL_ICMP; key0.addr = ip0->dst_address; - key0.port = echo0->identifier; + key0.port = vnet_buffer (b)->ip.reass.l4_src_port; // TODO should this be dst port? } else { @@ -332,7 +331,6 @@ icmp_match_out2in_slow (snat_main_t * sm, vlib_node_runtime_t * node, snat_session_key_t * p_value, u8 * p_dont_translate, void *d, void *e) { - icmp46_header_t *icmp0; u32 sw_if_index0; u32 rx_fib_index0; snat_session_key_t key0; @@ -345,13 +343,12 @@ icmp_match_out2in_slow (snat_main_t * sm, vlib_node_runtime_t * node, int err; u8 identity_nat; - icmp0 = (icmp46_header_t *) ip4_next_header (ip0); sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0); key0.protocol = 0; - err = icmp_get_key (ip0, &key0); + err = icmp_get_key (b0, ip0, &key0); if (err != -1) { b0->error = node->errors[SNAT_OUT2IN_ERROR_UNSUPPORTED_PROTOCOL]; @@ -390,9 +387,11 @@ icmp_match_out2in_slow (snat_main_t * sm, vlib_node_runtime_t * node, } } - if (PREDICT_FALSE (icmp0->type != ICMP4_echo_reply && - (icmp0->type != ICMP4_echo_request - || !is_addr_only))) + if (PREDICT_FALSE + (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags != + ICMP4_echo_reply + && (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags != + ICMP4_echo_request || !is_addr_only))) { b0->error = node->errors[SNAT_OUT2IN_ERROR_BAD_ICMP_TYPE]; next0 = SNAT_OUT2IN_NEXT_DROP; @@ -417,9 +416,13 @@ icmp_match_out2in_slow (snat_main_t * sm, vlib_node_runtime_t * node, } else { - if (PREDICT_FALSE (icmp0->type != ICMP4_echo_reply && - icmp0->type != ICMP4_echo_request && - !icmp_is_error_message (icmp0))) + if (PREDICT_FALSE + (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags != + ICMP4_echo_reply + && vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags != + ICMP4_echo_request + && !icmp_type_is_error_message (vnet_buffer (b0)->ip. + reass.icmp_type_or_tcp_flags))) { b0->error = node->errors[SNAT_OUT2IN_ERROR_BAD_ICMP_TYPE]; next0 = SNAT_OUT2IN_NEXT_DROP; @@ -462,7 +465,6 @@ icmp_match_out2in_fast (snat_main_t * sm, vlib_node_runtime_t * node, snat_session_key_t * p_value, u8 * p_dont_translate, void *d, void *e) { - icmp46_header_t *icmp0; u32 sw_if_index0; u32 rx_fib_index0; snat_session_key_t key0; @@ -472,11 +474,10 @@ icmp_match_out2in_fast (snat_main_t * sm, vlib_node_runtime_t * node, u32 next0 = ~0; int err; - icmp0 = (icmp46_header_t *) ip4_next_header (ip0); sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0); - err = icmp_get_key (ip0, &key0); + err = icmp_get_key (b0, ip0, &key0); if (err != -1) { b0->error = node->errors[err]; @@ -499,9 +500,12 @@ icmp_match_out2in_fast (snat_main_t * sm, vlib_node_runtime_t * node, goto out; } - if (PREDICT_FALSE (icmp0->type != ICMP4_echo_reply && - (icmp0->type != ICMP4_echo_request || !is_addr_only) && - !icmp_is_error_message (icmp0))) + if (PREDICT_FALSE + (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags != ICMP4_echo_reply + && (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags != + ICMP4_echo_request || !is_addr_only) + && !icmp_type_is_error_message (vnet_buffer (b0)->ip. + reass.icmp_type_or_tcp_flags))) { b0->error = node->errors[SNAT_OUT2IN_ERROR_BAD_ICMP_TYPE]; next0 = SNAT_OUT2IN_NEXT_DROP; @@ -575,72 +579,78 @@ icmp_out2in (snat_main_t * sm, dst_address /* changed member */ ); ip0->checksum = ip_csum_fold (sum0); - if (icmp0->checksum == 0) - icmp0->checksum = 0xffff; - if (!icmp_is_error_message (icmp0)) + if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment) { - new_id0 = sm0.port; - if (PREDICT_FALSE (new_id0 != echo0->identifier)) + if (icmp0->checksum == 0) + icmp0->checksum = 0xffff; + + if (!icmp_type_is_error_message (icmp0->type)) { - old_id0 = echo0->identifier; new_id0 = sm0.port; - echo0->identifier = new_id0; - - sum0 = icmp0->checksum; - sum0 = ip_csum_update (sum0, old_id0, new_id0, icmp_echo_header_t, - identifier /* changed member */ ); - icmp0->checksum = ip_csum_fold (sum0); + if (PREDICT_FALSE (new_id0 != echo0->identifier)) + { + old_id0 = echo0->identifier; + new_id0 = sm0.port; + echo0->identifier = new_id0; + + sum0 = icmp0->checksum; + sum0 = + ip_csum_update (sum0, old_id0, new_id0, icmp_echo_header_t, + identifier /* changed member */ ); + icmp0->checksum = ip_csum_fold (sum0); + } } - } - else - { - inner_ip0 = (ip4_header_t *) (echo0 + 1); - l4_header = ip4_next_header (inner_ip0); - - if (!ip4_header_checksum_is_valid (inner_ip0)) + else { - next0 = SNAT_OUT2IN_NEXT_DROP; - goto out; - } + inner_ip0 = (ip4_header_t *) (echo0 + 1); + l4_header = ip4_next_header (inner_ip0); - old_addr0 = inner_ip0->src_address.as_u32; - inner_ip0->src_address = sm0.addr; - new_addr0 = inner_ip0->src_address.as_u32; - - sum0 = icmp0->checksum; - sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, - src_address /* changed member */ ); - icmp0->checksum = ip_csum_fold (sum0); + if (!ip4_header_checksum_is_valid (inner_ip0)) + { + next0 = SNAT_OUT2IN_NEXT_DROP; + goto out; + } - switch (protocol) - { - case SNAT_PROTOCOL_ICMP: - inner_icmp0 = (icmp46_header_t *) l4_header; - inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1); - - old_id0 = inner_echo0->identifier; - new_id0 = sm0.port; - inner_echo0->identifier = new_id0; + old_addr0 = inner_ip0->src_address.as_u32; + inner_ip0->src_address = sm0.addr; + new_addr0 = inner_ip0->src_address.as_u32; sum0 = icmp0->checksum; - sum0 = ip_csum_update (sum0, old_id0, new_id0, icmp_echo_header_t, - identifier); + sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, + src_address /* changed member */ ); icmp0->checksum = ip_csum_fold (sum0); - break; - case SNAT_PROTOCOL_UDP: - case SNAT_PROTOCOL_TCP: - old_id0 = ((tcp_udp_header_t *) l4_header)->src_port; - new_id0 = sm0.port; - ((tcp_udp_header_t *) l4_header)->src_port = new_id0; - sum0 = icmp0->checksum; - sum0 = ip_csum_update (sum0, old_id0, new_id0, tcp_udp_header_t, - src_port); - icmp0->checksum = ip_csum_fold (sum0); - break; - default: - ASSERT (0); + switch (protocol) + { + case SNAT_PROTOCOL_ICMP: + inner_icmp0 = (icmp46_header_t *) l4_header; + inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1); + + old_id0 = inner_echo0->identifier; + new_id0 = sm0.port; + inner_echo0->identifier = new_id0; + + sum0 = icmp0->checksum; + sum0 = + ip_csum_update (sum0, old_id0, new_id0, icmp_echo_header_t, + identifier); + icmp0->checksum = ip_csum_fold (sum0); + break; + case SNAT_PROTOCOL_UDP: + case SNAT_PROTOCOL_TCP: + old_id0 = ((tcp_udp_header_t *) l4_header)->src_port; + new_id0 = sm0.port; + ((tcp_udp_header_t *) l4_header)->src_port = new_id0; + + sum0 = icmp0->checksum; + sum0 = ip_csum_update (sum0, old_id0, new_id0, tcp_udp_header_t, + src_port); + icmp0->checksum = ip_csum_fold (sum0); + break; + default: + ASSERT (0); + } } } @@ -816,13 +826,6 @@ VLIB_NODE_FN (snat_out2in_node) (vlib_main_t * vm, goto trace0; } - if (PREDICT_FALSE (ip4_is_fragment (ip0))) - { - next0 = SNAT_OUT2IN_NEXT_REASS; - fragments++; - goto trace0; - } - if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP)) { next0 = icmp_out2in_slow_path @@ -833,7 +836,7 @@ VLIB_NODE_FN (snat_out2in_node) (vlib_main_t * vm, } key0.addr = ip0->dst_address; - key0.port = udp0->dst_port; + key0.port = vnet_buffer (b0)->ip.reass.l4_dst_port; key0.protocol = proto0; key0.fib_index = rx_fib_index0; @@ -851,10 +854,11 @@ VLIB_NODE_FN (snat_out2in_node) (vlib_main_t * vm, * Send DHCP packets to the ipv4 stack, or we won't * be able to use dhcp client on the outside interface */ - if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_UDP - && (udp0->dst_port == - clib_host_to_net_u16 - (UDP_DST_PORT_dhcp_to_client)))) + if (PREDICT_FALSE + (proto0 == SNAT_PROTOCOL_UDP + && (vnet_buffer (b0)->ip.reass.l4_dst_port == + clib_host_to_net_u16 + (UDP_DST_PORT_dhcp_to_client)))) { vnet_feature_next (&next0, b0); goto trace0; @@ -897,34 +901,41 @@ VLIB_NODE_FN (snat_out2in_node) (vlib_main_t * vm, dst_address /* changed member */ ); ip0->checksum = ip_csum_fold (sum0); - old_port0 = udp0->dst_port; - new_port0 = udp0->dst_port = s0->in2out.port; - if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP)) { - sum0 = tcp0->checksum; - sum0 = ip_csum_update (sum0, old_addr0, new_addr0, - ip4_header_t, - dst_address /* changed member */ ); - - sum0 = ip_csum_update (sum0, old_port0, new_port0, - ip4_header_t /* cheat */ , - length /* changed member */ ); - tcp0->checksum = ip_csum_fold (sum0); - tcp_packets++; - } - else - { - if (PREDICT_FALSE (udp0->checksum)) + if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment) { - sum0 = udp0->checksum; + old_port0 = vnet_buffer (b0)->ip.reass.l4_dst_port; + new_port0 = udp0->dst_port = s0->in2out.port; + sum0 = tcp0->checksum; sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, dst_address /* changed member */ ); + sum0 = ip_csum_update (sum0, old_port0, new_port0, ip4_header_t /* cheat */ , length /* changed member */ ); - udp0->checksum = ip_csum_fold (sum0); + tcp0->checksum = ip_csum_fold (sum0); + } + tcp_packets++; + } + else + { + if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment) + { + old_port0 = vnet_buffer (b0)->ip.reass.l4_dst_port; + new_port0 = udp0->dst_port = s0->in2out.port; + if (PREDICT_FALSE (udp0->checksum)) + { + sum0 = udp0->checksum; + sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, dst_address /* changed member */ + ); + sum0 = + ip_csum_update (sum0, old_port0, new_port0, + ip4_header_t /* cheat */ , + length /* changed member */ ); + udp0->checksum = ip_csum_fold (sum0); + } } udp_packets++; } @@ -989,13 +1000,6 @@ VLIB_NODE_FN (snat_out2in_node) (vlib_main_t * vm, goto trace1; } - if (PREDICT_FALSE (ip4_is_fragment (ip1))) - { - next1 = SNAT_OUT2IN_NEXT_REASS; - fragments++; - goto trace1; - } - if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP)) { next1 = icmp_out2in_slow_path @@ -1006,7 +1010,7 @@ VLIB_NODE_FN (snat_out2in_node) (vlib_main_t * vm, } key1.addr = ip1->dst_address; - key1.port = udp1->dst_port; + key1.port = vnet_buffer (b1)->ip.reass.l4_dst_port; key1.protocol = proto1; key1.fib_index = rx_fib_index1; @@ -1024,10 +1028,11 @@ VLIB_NODE_FN (snat_out2in_node) (vlib_main_t * vm, * Send DHCP packets to the ipv4 stack, or we won't * be able to use dhcp client on the outside interface */ - if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_UDP - && (udp1->dst_port == - clib_host_to_net_u16 - (UDP_DST_PORT_dhcp_to_client)))) + if (PREDICT_FALSE + (proto1 == SNAT_PROTOCOL_UDP + && (vnet_buffer (b1)->ip.reass.l4_dst_port == + clib_host_to_net_u16 + (UDP_DST_PORT_dhcp_to_client)))) { vnet_feature_next (&next1, b1); goto trace1; @@ -1070,34 +1075,45 @@ VLIB_NODE_FN (snat_out2in_node) (vlib_main_t * vm, dst_address /* changed member */ ); ip1->checksum = ip_csum_fold (sum1); - old_port1 = udp1->dst_port; - new_port1 = udp1->dst_port = s1->in2out.port; - if (PREDICT_TRUE (proto1 == SNAT_PROTOCOL_TCP)) { - sum1 = tcp1->checksum; - sum1 = ip_csum_update (sum1, old_addr1, new_addr1, - ip4_header_t, - dst_address /* changed member */ ); - - sum1 = ip_csum_update (sum1, old_port1, new_port1, - ip4_header_t /* cheat */ , - length /* changed member */ ); - tcp1->checksum = ip_csum_fold (sum1); - tcp_packets++; - } - else - { - if (PREDICT_FALSE (udp1->checksum)) + if (!vnet_buffer (b1)->ip.reass.is_non_first_fragment) { - sum1 = udp1->checksum; + old_port1 = vnet_buffer (b1)->ip.reass.l4_dst_port; + new_port1 = udp1->dst_port = s1->in2out.port; + + sum1 = tcp1->checksum; sum1 = ip_csum_update (sum1, old_addr1, new_addr1, ip4_header_t, dst_address /* changed member */ ); + sum1 = ip_csum_update (sum1, old_port1, new_port1, ip4_header_t /* cheat */ , length /* changed member */ ); - udp1->checksum = ip_csum_fold (sum1); + tcp1->checksum = ip_csum_fold (sum1); + } + tcp_packets++; + } + else + { + if (!vnet_buffer (b1)->ip.reass.is_non_first_fragment) + { + old_port1 = vnet_buffer (b1)->ip.reass.l4_dst_port; + new_port1 = udp1->dst_port = s1->in2out.port; + if (PREDICT_FALSE (udp1->checksum)) + { + + sum1 = udp1->checksum; + sum1 = + ip_csum_update (sum1, old_addr1, new_addr1, + ip4_header_t, + dst_address /* changed member */ ); + sum1 = + ip_csum_update (sum1, old_port1, new_port1, + ip4_header_t /* cheat */ , + length /* changed member */ ); + udp1->checksum = ip_csum_fold (sum1); + } } udp_packets++; } @@ -1199,13 +1215,6 @@ VLIB_NODE_FN (snat_out2in_node) (vlib_main_t * vm, goto trace00; } - if (PREDICT_FALSE (ip4_is_fragment (ip0))) - { - next0 = SNAT_OUT2IN_NEXT_REASS; - fragments++; - goto trace00; - } - if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP)) { next0 = icmp_out2in_slow_path @@ -1216,7 +1225,7 @@ VLIB_NODE_FN (snat_out2in_node) (vlib_main_t * vm, } key0.addr = ip0->dst_address; - key0.port = udp0->dst_port; + key0.port = vnet_buffer (b0)->ip.reass.l4_dst_port; key0.protocol = proto0; key0.fib_index = rx_fib_index0; @@ -1234,10 +1243,11 @@ VLIB_NODE_FN (snat_out2in_node) (vlib_main_t * vm, * Send DHCP packets to the ipv4 stack, or we won't * be able to use dhcp client on the outside interface */ - if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_UDP - && (udp0->dst_port == - clib_host_to_net_u16 - (UDP_DST_PORT_dhcp_to_client)))) + if (PREDICT_FALSE + (proto0 == SNAT_PROTOCOL_UDP + && (vnet_buffer (b0)->ip.reass.l4_dst_port == + clib_host_to_net_u16 + (UDP_DST_PORT_dhcp_to_client)))) { vnet_feature_next (&next0, b0); goto trace00; @@ -1280,34 +1290,42 @@ VLIB_NODE_FN (snat_out2in_node) (vlib_main_t * vm, dst_address /* changed member */ ); ip0->checksum = ip_csum_fold (sum0); - old_port0 = udp0->dst_port; - new_port0 = udp0->dst_port = s0->in2out.port; - if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP)) { - sum0 = tcp0->checksum; - sum0 = ip_csum_update (sum0, old_addr0, new_addr0, - ip4_header_t, - dst_address /* changed member */ ); - - sum0 = ip_csum_update (sum0, old_port0, new_port0, - ip4_header_t /* cheat */ , - length /* changed member */ ); - tcp0->checksum = ip_csum_fold (sum0); - tcp_packets++; - } - else - { - if (PREDICT_FALSE (udp0->checksum)) + if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment) { - sum0 = udp0->checksum; + old_port0 = vnet_buffer (b0)->ip.reass.l4_dst_port; + new_port0 = udp0->dst_port = s0->in2out.port; + + sum0 = tcp0->checksum; sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, dst_address /* changed member */ ); + sum0 = ip_csum_update (sum0, old_port0, new_port0, ip4_header_t /* cheat */ , length /* changed member */ ); - udp0->checksum = ip_csum_fold (sum0); + tcp0->checksum = ip_csum_fold (sum0); + } + tcp_packets++; + } + else + { + if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment) + { + old_port0 = vnet_buffer (b0)->ip.reass.l4_dst_port; + new_port0 = udp0->dst_port = s0->in2out.port; + if (PREDICT_FALSE (udp0->checksum)) + { + sum0 = udp0->checksum; + sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, dst_address /* changed member */ + ); + sum0 = + ip_csum_update (sum0, old_port0, new_port0, + ip4_header_t /* cheat */ , + length /* changed member */ ); + udp0->checksum = ip_csum_fold (sum0); + } } udp_packets++; } @@ -1381,344 +1399,6 @@ VLIB_REGISTER_NODE (snat_out2in_node) = { [SNAT_OUT2IN_NEXT_DROP] = "error-drop", [SNAT_OUT2IN_NEXT_LOOKUP] = "ip4-lookup", [SNAT_OUT2IN_NEXT_ICMP_ERROR] = "ip4-icmp-error", - [SNAT_OUT2IN_NEXT_REASS] = "nat44-out2in-reass", - }, -}; -/* *INDENT-ON* */ - -VLIB_NODE_FN (nat44_out2in_reass_node) (vlib_main_t * vm, - vlib_node_runtime_t * node, - vlib_frame_t * frame) -{ - u32 n_left_from, *from, *to_next; - snat_out2in_next_t next_index; - u32 pkts_processed = 0, cached_fragments = 0; - snat_main_t *sm = &snat_main; - f64 now = vlib_time_now (vm); - u32 thread_index = vm->thread_index; - snat_main_per_thread_data_t *per_thread_data = - &sm->per_thread_data[thread_index]; - u32 *fragments_to_drop = 0; - u32 *fragments_to_loopback = 0; - - 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, sw_if_index0, proto0, rx_fib_index0, new_addr0, old_addr0; - vlib_buffer_t *b0; - u32 next0; - u8 cached0 = 0; - ip4_header_t *ip0; - nat_reass_ip4_t *reass0; - udp_header_t *udp0; - tcp_header_t *tcp0; - icmp46_header_t *icmp0; - snat_session_key_t key0, sm0; - clib_bihash_kv_8_8_t kv0, value0; - snat_session_t *s0 = 0; - u16 old_port0, new_port0; - ip_csum_t sum0; - u8 identity_nat0; - - /* 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 = SNAT_OUT2IN_NEXT_LOOKUP; - - sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; - rx_fib_index0 = - fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4, - sw_if_index0); - - if (PREDICT_FALSE (nat_reass_is_drop_frag (0))) - { - next0 = SNAT_OUT2IN_NEXT_DROP; - b0->error = node->errors[SNAT_OUT2IN_ERROR_DROP_FRAGMENT]; - goto trace0; - } - - ip0 = (ip4_header_t *) vlib_buffer_get_current (b0); - udp0 = ip4_next_header (ip0); - tcp0 = (tcp_header_t *) udp0; - icmp0 = (icmp46_header_t *) udp0; - proto0 = ip_proto_to_snat_proto (ip0->protocol); - - reass0 = nat_ip4_reass_find_or_create (ip0->src_address, - ip0->dst_address, - ip0->fragment_id, - ip0->protocol, - 1, &fragments_to_drop); - - if (PREDICT_FALSE (!reass0)) - { - next0 = SNAT_OUT2IN_NEXT_DROP; - b0->error = node->errors[SNAT_OUT2IN_ERROR_MAX_REASS]; - nat_elog_notice ("maximum reassemblies exceeded"); - goto trace0; - } - - if (PREDICT_FALSE (ip4_is_first_fragment (ip0))) - { - if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP)) - { - next0 = icmp_out2in_slow_path - (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node, - next0, now, thread_index, &s0); - - if (PREDICT_TRUE (next0 != SNAT_OUT2IN_NEXT_DROP)) - { - if (s0) - reass0->sess_index = s0 - per_thread_data->sessions; - else - reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE; - reass0->thread_index = thread_index; - nat_ip4_reass_get_frags (reass0, - &fragments_to_loopback); - } - - goto trace0; - } - - key0.addr = ip0->dst_address; - key0.port = udp0->dst_port; - key0.protocol = proto0; - key0.fib_index = rx_fib_index0; - kv0.key = key0.as_u64; - - if (clib_bihash_search_8_8 - (&per_thread_data->out2in, &kv0, &value0)) - { - /* Try to match static mapping by external address and port, - destination address and port in packet */ - if (snat_static_mapping_match - (sm, key0, &sm0, 1, 0, 0, 0, 0, &identity_nat0)) - { - /* - * Send DHCP packets to the ipv4 stack, or we won't - * be able to use dhcp client on the outside interface - */ - if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_UDP - && (udp0->dst_port - == - clib_host_to_net_u16 - (UDP_DST_PORT_dhcp_to_client)))) - { - vnet_feature_next (&next0, b0); - goto trace0; - } - - if (!sm->forwarding_enabled) - { - b0->error = - node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION]; - next0 = SNAT_OUT2IN_NEXT_DROP; - } - else - { - reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE; - nat_ip4_reass_get_frags (reass0, - &fragments_to_loopback); - } - goto trace0; - } - - if (PREDICT_FALSE (identity_nat0)) - goto trace0; - - /* Create session initiated by host from external network */ - s0 = - create_session_for_static_mapping (sm, b0, sm0, key0, - node, thread_index, - now); - if (!s0) - { - b0->error = - node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION]; - next0 = SNAT_OUT2IN_NEXT_DROP; - goto trace0; - } - reass0->sess_index = s0 - per_thread_data->sessions; - reass0->thread_index = thread_index; - } - else - { - s0 = pool_elt_at_index (per_thread_data->sessions, - value0.value); - reass0->sess_index = value0.value; - } - nat_ip4_reass_get_frags (reass0, &fragments_to_loopback); - } - else - { - if (reass0->flags & NAT_REASS_FLAG_ED_DONT_TRANSLATE) - goto trace0; - if (PREDICT_FALSE (reass0->sess_index == (u32) ~ 0)) - { - if (nat_ip4_reass_add_fragment - (thread_index, reass0, bi0, &fragments_to_drop)) - { - b0->error = node->errors[SNAT_OUT2IN_ERROR_MAX_FRAG]; - nat_elog_notice - ("maximum fragments per reassembly exceeded"); - next0 = SNAT_OUT2IN_NEXT_DROP; - goto trace0; - } - cached0 = 1; - goto trace0; - } - s0 = pool_elt_at_index (per_thread_data->sessions, - reass0->sess_index); - } - - old_addr0 = ip0->dst_address.as_u32; - ip0->dst_address = s0->in2out.addr; - new_addr0 = ip0->dst_address.as_u32; - vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->in2out.fib_index; - - sum0 = ip0->checksum; - sum0 = ip_csum_update (sum0, old_addr0, new_addr0, - ip4_header_t, - dst_address /* changed member */ ); - ip0->checksum = ip_csum_fold (sum0); - - if (PREDICT_FALSE (ip4_is_first_fragment (ip0))) - { - old_port0 = udp0->dst_port; - new_port0 = udp0->dst_port = s0->in2out.port; - - if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP)) - { - sum0 = tcp0->checksum; - sum0 = ip_csum_update (sum0, old_addr0, new_addr0, - ip4_header_t, - dst_address /* changed member */ ); - - sum0 = ip_csum_update (sum0, old_port0, new_port0, - ip4_header_t /* cheat */ , - length /* changed member */ ); - tcp0->checksum = ip_csum_fold (sum0); - } - else if (udp0->checksum) - { - sum0 = udp0->checksum; - sum0 = ip_csum_update (sum0, old_addr0, new_addr0, - ip4_header_t, - dst_address /* changed member */ ); - sum0 = ip_csum_update (sum0, old_port0, new_port0, - ip4_header_t /* cheat */ , - length /* changed member */ ); - udp0->checksum = ip_csum_fold (sum0); - } - } - - /* Accounting */ - nat44_session_update_counters (s0, now, - vlib_buffer_length_in_chain (vm, b0), - thread_index); - /* Per-user LRU list maintenance */ - nat44_session_update_lru (sm, s0, thread_index); - - trace0: - if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) - && (b0->flags & VLIB_BUFFER_IS_TRACED))) - { - nat44_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--; - cached_fragments++; - } - else - { - pkts_processed += next0 != SNAT_OUT2IN_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_fast (from, fragments_to_loopback, - sizeof (u32) * len); - n_left_from = len; - vec_reset_length (fragments_to_loopback); - } - else - { - clib_memcpy_fast (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, sm->out2in_reass_node_index, - SNAT_OUT2IN_ERROR_PROCESSED_FRAGMENTS, - pkts_processed); - vlib_node_increment_counter (vm, sm->out2in_reass_node_index, - SNAT_OUT2IN_ERROR_CACHED_FRAGMENTS, - cached_fragments); - - nat_send_all_to_node (vm, fragments_to_drop, node, - &node->errors[SNAT_OUT2IN_ERROR_DROP_FRAGMENT], - SNAT_OUT2IN_NEXT_DROP); - - vec_free (fragments_to_drop); - vec_free (fragments_to_loopback); - return frame->n_vectors; -} - -/* *INDENT-OFF* */ -VLIB_REGISTER_NODE (nat44_out2in_reass_node) = { - .name = "nat44-out2in-reass", - .vector_size = sizeof (u32), - .format_trace = format_nat44_reass_trace, - .type = VLIB_NODE_TYPE_INTERNAL, - - .n_errors = ARRAY_LEN(snat_out2in_error_strings), - .error_strings = snat_out2in_error_strings, - - .n_next_nodes = SNAT_OUT2IN_N_NEXT, - - /* edit / add dispositions here */ - .next_nodes = { - [SNAT_OUT2IN_NEXT_DROP] = "error-drop", - [SNAT_OUT2IN_NEXT_LOOKUP] = "ip4-lookup", - [SNAT_OUT2IN_NEXT_ICMP_ERROR] = "ip4-icmp-error", - [SNAT_OUT2IN_NEXT_REASS] = "nat44-out2in-reass", }, }; /* *INDENT-ON* */ @@ -1919,7 +1599,6 @@ VLIB_REGISTER_NODE (snat_out2in_fast_node) = { [SNAT_OUT2IN_NEXT_LOOKUP] = "ip4-lookup", [SNAT_OUT2IN_NEXT_DROP] = "error-drop", [SNAT_OUT2IN_NEXT_ICMP_ERROR] = "ip4-icmp-error", - [SNAT_OUT2IN_NEXT_REASS] = "nat44-out2in-reass", }, }; /* *INDENT-ON* */ -- cgit 1.2.3-korg