/* * decap.c: gtpu tunnel decap packet processing * * Copyright (c) 2017 Intel 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. */ #include #include extern vlib_node_registration_t gtpu4_input_node; extern vlib_node_registration_t gtpu6_input_node; typedef struct { u32 next_index; u32 tunnel_index; u32 error; u32 teid; gtpu_header_t header; u8 forwarding_type; } gtpu_rx_trace_t; static u8 * format_gtpu_rx_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 *); gtpu_rx_trace_t * t = va_arg (*args, gtpu_rx_trace_t *); if (t->tunnel_index != ~0) { s = format (s, "GTPU decap from gtpu_tunnel%d ", t->tunnel_index); switch (t->forwarding_type) { case GTPU_FORWARD_BAD_HEADER: s = format (s, "forwarding bad-header "); break; case GTPU_FORWARD_UNKNOWN_TEID: s = format (s, "forwarding unknown-teid "); break; case GTPU_FORWARD_UNKNOWN_TYPE: s = format (s, "forwarding unknown-type "); break; } s = format (s, "teid %u, ", t->teid); } else { s = format (s, "GTPU decap error - tunnel for teid %u does not exist, ", t->teid); } s = format (s, "next %d error %d, ", t->next_index, t->error); s = format (s, "flags: 0x%x, type: %d, length: %d", t->header.ver_flags, t->header.type, t->header.length); return s; } always_inline u32 validate_gtpu_fib (vlib_buffer_t *b, gtpu_tunnel_t *t, u32 is_ip4) { return t->encap_fib_index == vlib_buffer_get_ip_fib_index (b, is_ip4); } // Gets run with every input always_inline uword gtpu_input (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame, u32 is_ip4) { u32 n_left_from, next_index, * from, * to_next; gtpu_main_t * gtm = >pu_main; vnet_main_t * vnm = gtm->vnet_main; vnet_interface_main_t * im = &vnm->interface_main; u32 last_tunnel_index = ~0; gtpu4_tunnel_key_t last_key4; gtpu6_tunnel_key_t last_key6; u32 pkts_decapsulated = 0; u32 thread_index = vlib_get_thread_index(); u32 stats_sw_if_index, stats_n_packets, stats_n_bytes; if (is_ip4) last_key4.as_u64 = ~0; else clib_memset (&last_key6, 0xff, sizeof (last_key6)); // Where is the framevector coming from from = vlib_frame_vector_args (from_frame); // number of packets left in frame n_left_from = from_frame->n_vectors; // whats the next node it needs to go to next_index = node->cached_next_index; // stats from the next interface stats_sw_if_index = node->runtime_data[0]; // number of packets processed stats_n_packets = stats_n_bytes = 0; // run until no more packets left in vectorframe while (n_left_from > 0) { u32 n_left_to_next; // get vectorframe to process vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); // while there are still more than 4 packets left in frame and more than // two packets in current frame while (n_left_from >= 4 && n_left_to_next >= 2) { // buffer index for loading packet data u32 bi0, bi1; // vlib packet buffer vlib_buffer_t * b0, * b1; // next operation to do with the packet u32 next0, next1; // IP4 header type ip4_header_t *ip4_0, *ip4_1; ip6_header_t *ip6_0, *ip6_1; gtpu_header_t *gtpu0, *gtpu1; i32 gtpu_hdr_len0, gtpu_hdr_len1; uword * p0, * p1; u32 tunnel_index0, tunnel_index1; gtpu_tunnel_t * t0, * t1, * mt0 = NULL, * mt1 = NULL; gtpu4_tunnel_key_t key4_0, key4_1; gtpu6_tunnel_key_t key6_0, key6_1; u32 error0, error1; u32 sw_if_index0, sw_if_index1, len0, len1; u8 has_space0, has_space1; u8 ver0, ver1; udp_header_t *udp0, *udp1; ip_csum_t sum0, sum1; u32 old0, old1; gtpu_ext_header_t ext = { .type = 0, .len = 0, .pad = 0 }; gtpu_ext_header_t *ext0, *ext1; bool is_fast_track0, is_fast_track1; ext0 = ext1 = &ext; /* Prefetch next iteration. */ { vlib_buffer_t * p2, * p3; // prefetch 3 and 4 p2 = vlib_get_buffer (vm, from[2]); p3 = vlib_get_buffer (vm, from[3]); vlib_prefetch_buffer_header (p2, LOAD); vlib_prefetch_buffer_header (p3, LOAD); CLIB_PREFETCH (p2->data, 2*CLIB_CACHE_LINE_BYTES, LOAD); CLIB_PREFETCH (p3->data, 2*CLIB_CACHE_LINE_BYTES, LOAD); } // getting buffer index from vectorframe bi0 = from[0]; bi1 = from[1]; // pre inserting the packets for the next node to_next[0] = bi0; to_next[1] = bi1; // forward in vectorframe from += 2; // forward next node to_next += 2; // decimate message counter for next node n_left_to_next -= 2; // decimate message counter for current progessing node n_left_from -= 2; // load packets into buffer b0 = vlib_get_buffer (vm, bi0); b1 = vlib_get_buffer (vm, bi1); /* udp leaves current_data pointing at the gtpu header */ // get pointers to the beginnings of the gtpu frame gtpu0 = vlib_buffer_get_current (b0); gtpu1 = vlib_buffer_get_current (b1); if (is_ip4) { ip4_0 = (void *) ((u8 *) gtpu0 - sizeof (udp_header_t) - sizeof (ip4_header_t)); ip4_1 = (void *) ((u8 *) gtpu1 - sizeof (udp_header_t) - sizeof (ip4_header_t)); } else { ip6_0 = (void *) ((u8 *) gtpu0 - sizeof (udp_header_t) - sizeof (ip6_header_t)); ip6_1 = (void *) ((u8 *) gtpu1 - sizeof (udp_header_t) - sizeof (ip6_header_t)); } udp0 = (void *) ((u8 *) gtpu0 - sizeof (udp_header_t)); udp1 = (void *) ((u8 *) gtpu1 - sizeof (udp_header_t)); tunnel_index0 = ~0; error0 = 0; tunnel_index1 = ~0; error1 = 0; /* speculatively load gtp header version field */ ver0 = gtpu0->ver_flags; ver1 = gtpu1->ver_flags; /* * Manipulate gtpu header * TBD: Manipulate Sequence Number and N-PDU Number * TBD: Manipulate Next Extension Header */ /* Perform all test assuming the packet has the needed space. * Check if version 1, not PT, not reserved. * Check message type 255. */ is_fast_track0 = ((ver0 & (GTPU_VER_MASK | GTPU_PT_BIT | GTPU_RES_BIT)) == (GTPU_V1_VER | GTPU_PT_BIT)); is_fast_track0 = is_fast_track0 & (gtpu0->type == 255); is_fast_track1 = ((ver1 & (GTPU_VER_MASK | GTPU_PT_BIT | GTPU_RES_BIT)) == (GTPU_V1_VER | GTPU_PT_BIT)); is_fast_track1 = is_fast_track1 & (gtpu1->type == 255); /* Make the header overlap the end of the gtpu_header_t, so * that it starts with the same Next extension header as the * gtpu_header_t. * This means that the gtpu_ext_header_t (ext) has the type * from the previous header and the length from the current one. * Works both for the first gtpu_header_t and all following * gtpu_ext_header_t extensions. * Copy the ext data if the E bit is set, else use the 0 value. */ ext0 = (ver0 & GTPU_E_BIT) ? (gtpu_ext_header_t *) >pu0->next_ext_type : &ext; ext1 = (ver1 & GTPU_E_BIT) ? (gtpu_ext_header_t *) >pu1->next_ext_type : &ext; /* One or more of the E, S and PN flags are set, so all 3 fields * must be present: * The gtpu_header_t contains the Sequence number, N-PDU number and * Next extension header type. * If E is not set subtract 4 bytes from the header. * Then add the length of the extension. 0 * 4 if E is not set, * else it's the ext->len from the gtp extension. Length is multiple * of 4 always. * Note: This length is only valid if the header itself is valid, * so it must be verified before use. */ gtpu_hdr_len0 = sizeof (gtpu_header_t) - (((ver0 & GTPU_E_S_PN_BIT) == 0) * 4) + ext0->len * 4; gtpu_hdr_len1 = sizeof (gtpu_header_t) - (((ver1 & GTPU_E_S_PN_BIT) == 0) * 4) + ext1->len * 4; /* Get the next extension, unconditionally. * If E was not set in the gtp header ext->len is zero. * If E was set ext0 will now point to the packet buffer. * If the gtp packet is illegal this might point outside the buffer. * TBD check the updated for ext0->type != 0, and continue removing * extensions. Only for clarity, will be optimized away. */ ext0 += ext0->len * 4 / sizeof (*ext0); ext1 += ext1->len * 4 / sizeof (*ext1); /* Check the space, if this is true then ext0 points to a valid * location in the buffer as well. */ has_space0 = vlib_buffer_has_space (b0, gtpu_hdr_len0); has_space1 = vlib_buffer_has_space (b1, gtpu_hdr_len1); /* Diverge the packet paths for 0 and 1 */ if (PREDICT_FALSE ((!is_fast_track0) | (!has_space0))) { /* Not fast path. ext0 and gtpu_hdr_len0 might be wrong */ /* GCC will hopefully fix the duplicate compute */ if (PREDICT_FALSE ( !((ver0 & (GTPU_VER_MASK | GTPU_PT_BIT | GTPU_RES_BIT)) == (GTPU_V1_VER | GTPU_PT_BIT)) | (!has_space0))) { /* The header or size is wrong */ error0 = has_space0 ? GTPU_ERROR_BAD_VER : GTPU_ERROR_TOO_SMALL; next0 = GTPU_INPUT_NEXT_DROP; /* This is an unsupported/bad packet. * Check if it is to be forwarded. */ if (is_ip4) tunnel_index0 = gtm->bad_header_forward_tunnel_index_ipv4; else tunnel_index0 = gtm->bad_header_forward_tunnel_index_ipv6; if (PREDICT_FALSE (tunnel_index0 != ~0)) goto forward0; goto trace0; } /* Correct version and has the space. It can only be unknown * message type. */ error0 = GTPU_ERROR_UNSUPPORTED_TYPE; next0 = GTPU_INPUT_NEXT_DROP; /* This is an error/nonstandard packet * Check if it is to be forwarded. */ if (is_ip4) tunnel_index0 = gtm->unknown_type_forward_tunnel_index_ipv4; else tunnel_index0 = gtm->unknown_type_forward_tunnel_index_ipv6; if (PREDICT_FALSE (tunnel_index0 != ~0)) goto forward0; /* The packet is ipv6/not forwarded */ goto trace0; } /* Manipulate packet 0 */ if (is_ip4) { key4_0.src = ip4_0->src_address.as_u32; key4_0.teid = gtpu0->teid; /* Make sure GTPU tunnel exist according to packet SourceIP and * teid SourceIP identify a GTPU path, and teid identify a tunnel * in a given GTPU path */ if (PREDICT_FALSE (key4_0.as_u64 != last_key4.as_u64)) { p0 = hash_get (gtm->gtpu4_tunnel_by_key, key4_0.as_u64); if (PREDICT_FALSE (p0 == NULL)) { error0 = GTPU_ERROR_NO_SUCH_TUNNEL; next0 = GTPU_INPUT_NEXT_DROP; /* This is a standard packet, but no tunnel was found. * Check if it is to be forwarded. */ tunnel_index0 = gtm->unknown_teid_forward_tunnel_index_ipv4; if (PREDICT_FALSE (tunnel_index0 != ~0)) goto forward0; goto trace0; } last_key4.as_u64 = key4_0.as_u64; tunnel_index0 = last_tunnel_index = p0[0]; } else // when the address of the packet is the same as the packet // before ... saving lookup in table tunnel_index0 = last_tunnel_index; // tunnel index in vpp t0 = pool_elt_at_index (gtm->tunnels, tunnel_index0); /* Validate GTPU tunnel encap-fib index against packet */ if (PREDICT_FALSE (validate_gtpu_fib (b0, t0, is_ip4) == 0)) { error0 = GTPU_ERROR_NO_SUCH_TUNNEL; next0 = GTPU_INPUT_NEXT_DROP; tunnel_index0 = gtm->unknown_teid_forward_tunnel_index_ipv4; if (PREDICT_FALSE (tunnel_index0 != ~0)) goto forward0; goto trace0; } /* Validate GTPU tunnel SourceIP against packet DestinationIP */ if (PREDICT_TRUE (ip4_0->dst_address.as_u32 == t0->src.ip4.as_u32)) goto next0; /* valid packet */ if (PREDICT_FALSE (ip4_address_is_multicast (&ip4_0->dst_address))) { key4_0.src = ip4_0->dst_address.as_u32; key4_0.teid = gtpu0->teid; /* Make sure mcast GTPU tunnel exist by packet DIP and teid */ p0 = hash_get (gtm->gtpu4_tunnel_by_key, key4_0.as_u64); if (PREDICT_TRUE (p0 != NULL)) { mt0 = pool_elt_at_index (gtm->tunnels, p0[0]); goto next0; /* valid packet */ } } error0 = GTPU_ERROR_NO_SUCH_TUNNEL; next0 = GTPU_INPUT_NEXT_DROP; tunnel_index0 = gtm->unknown_teid_forward_tunnel_index_ipv4; if (PREDICT_FALSE (tunnel_index0 != ~0)) goto forward0; goto trace0; } else /* !is_ip4 */ { key6_0.src.as_u64[0] = ip6_0->src_address.as_u64[0]; key6_0.src.as_u64[1] = ip6_0->src_address.as_u64[1]; key6_0.teid = gtpu0->teid; /* Make sure GTPU tunnel exist according to packet SIP and teid * SIP identify a GTPU path, and teid identify a tunnel in a given GTPU path */ if (PREDICT_FALSE (memcmp(&key6_0, &last_key6, sizeof(last_key6)) != 0)) { p0 = hash_get_mem (gtm->gtpu6_tunnel_by_key, &key6_0); if (PREDICT_FALSE (p0 == NULL)) { error0 = GTPU_ERROR_NO_SUCH_TUNNEL; next0 = GTPU_INPUT_NEXT_DROP; /* This is a standard packet, but no tunnel was found. * Check if it is to be forwarded. */ tunnel_index0 = gtm->unknown_teid_forward_tunnel_index_ipv6; if (PREDICT_FALSE (tunnel_index0 != ~0)) goto forward0; goto trace0; } clib_memcpy_fast (&last_key6, &key6_0, sizeof (key6_0)); tunnel_index0 = last_tunnel_index = p0[0]; } else tunnel_index0 = last_tunnel_index; t0 = pool_elt_at_index (gtm->tunnels, tunnel_index0); /* Validate GTPU tunnel encap-fib index against packet */ if (PREDICT_FALSE (validate_gtpu_fib (b0, t0, is_ip4) == 0)) { error0 = GTPU_ERROR_NO_SUCH_TUNNEL; next0 = GTPU_INPUT_NEXT_DROP; tunnel_index0 = gtm->unknown_teid_forward_tunnel_index_ipv6; if (PREDICT_FALSE (tunnel_index0 != ~0)) goto forward0; goto trace0; } /* Validate GTPU tunnel SIP against packet DIP */ if (PREDICT_TRUE (ip6_address_is_equal (&ip6_0->dst_address, &t0->src.ip6))) goto next0; /* valid packet */ if (PREDICT_FALSE (ip6_address_is_multicast (&ip6_0->dst_address))) { key6_0.src.as_u64[0] = ip6_0->dst_address.as_u64[0]; key6_0.src.as_u64[1] = ip6_0->dst_address.as_u64[1]; key6_0.teid = gtpu0->teid; p0 = hash_get_mem (gtm->gtpu6_tunnel_by_key, &key6_0); if (PREDICT_TRUE (p0 != NULL)) { mt0 = pool_elt_at_index (gtm->tunnels, p0[0]); goto next0; /* valid packet */ } } error0 = GTPU_ERROR_NO_SUCH_TUNNEL; next0 = GTPU_INPUT_NEXT_DROP; tunnel_index0 = gtm->unknown_teid_forward_tunnel_index_ipv6; if (PREDICT_FALSE (tunnel_index0 != ~0)) goto forward0; goto trace0; } forward0: /* Get the tunnel */ t0 = pool_elt_at_index (gtm->tunnels, tunnel_index0); /* Validate GTPU tunnel encap-fib index against packet */ if (PREDICT_FALSE (validate_gtpu_fib (b0, t0, is_ip4) == 0)) { error0 = GTPU_ERROR_NO_ERROR_TUNNEL; next0 = GTPU_INPUT_NEXT_DROP; goto trace0; } /* Clear the error, next0 will be overwritten by the tunnel */ error0 = 0; if (is_ip4) { /* Forward packet instead. Push the IP+UDP header */ gtpu_hdr_len0 = -(i32) (sizeof (udp_header_t) + sizeof (ip4_header_t)); /* Backup the IP4 checksum and address */ sum0 = ip4_0->checksum; old0 = ip4_0->dst_address.as_u32; /* Update IP address of the packet using the src from the tunnel */ ip4_0->dst_address.as_u32 = t0->src.ip4.as_u32; /* Fix the IP4 checksum */ sum0 = ip_csum_update (sum0, old0, ip4_0->dst_address.as_u32, ip4_header_t, dst_address /* changed member */); ip4_0->checksum = ip_csum_fold (sum0); } else { /* Forward packet instead. Push the IP+UDP header */ gtpu_hdr_len0 = -(i32) (sizeof (udp_header_t) + sizeof (ip6_header_t)); /* IPv6 UDP checksum is mandatory */ int bogus = 0; udp0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ip6_0, &bogus); if (udp0->checksum == 0) udp0->checksum = 0xffff; } next0: /* Pop/Remove gtpu header from buffered package or push existing * IP+UDP header back to the buffer*/ vlib_buffer_advance (b0, gtpu_hdr_len0); // where does it need to go in the graph next next0 = t0->decap_next_index; // interface index the package is on sw_if_index0 = t0->sw_if_index; len0 = vlib_buffer_length_in_chain (vm, b0); // Next three lines are for forwarding the payload to L2 // subinterfaces /* Required to make the l2 tag push / pop code work on l2 subifs */ if (PREDICT_TRUE (next0 == GTPU_INPUT_NEXT_L2_INPUT)) vnet_update_l2_len (b0); /* Set packet input sw_if_index to unicast GTPU tunnel for learning */ vnet_buffer (b0)->sw_if_index[VLIB_RX] = sw_if_index0; // in case its a multicast packet set different interface index sw_if_index0 = (mt0) ? mt0->sw_if_index : sw_if_index0; // Update stats pkts_decapsulated++; stats_n_packets += 1; stats_n_bytes += len0; /* Batch stats increment on the same gtpu tunnel so counter is not incremented per packet */ if (PREDICT_FALSE (sw_if_index0 != stats_sw_if_index)) { stats_n_packets -= 1; stats_n_bytes -= len0; if (stats_n_packets) vlib_increment_combined_counter (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX, thread_index, stats_sw_if_index, stats_n_packets, stats_n_bytes); stats_n_packets = 1; stats_n_bytes = len0; stats_sw_if_index = sw_if_index0; } trace0: b0->error = error0 ? node->errors[error0] : 0; if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) { gtpu_rx_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof (*tr)); tr->next_index = next0; tr->error = error0; tr->tunnel_index = tunnel_index0; tr->teid = has_space0 ? clib_net_to_host_u32(gtpu0->teid) : ~0; if (vlib_buffer_has_space (b0, 4)) { tr->header.ver_flags = gtpu0->ver_flags; tr->header.type = gtpu0->type; tr->header.length = clib_net_to_host_u16 (gtpu0->length); } } /* End of processing for packet 0, start for packet 1 */ if (PREDICT_FALSE ((!is_fast_track1) | (!has_space1))) { /* Not fast path. ext1 and gtpu_hdr_len1 might be wrong */ /* GCC will hopefully fix the duplicate compute */ if (PREDICT_FALSE ( !((ver1 & (GTPU_VER_MASK | GTPU_PT_BIT | GTPU_RES_BIT)) == (GTPU_V1_VER | GTPU_PT_BIT)) | (!has_space1))) { /* The header or size is wrong */ error1 = has_space1 ? GTPU_ERROR_BAD_VER : GTPU_ERROR_TOO_SMALL; next1 = GTPU_INPUT_NEXT_DROP; /* This is an unsupported/bad packet. * Check if it is to be forwarded. */ if (is_ip4) tunnel_index1 = gtm->bad_header_forward_tunnel_index_ipv4; else tunnel_index1 = gtm->bad_header_forward_tunnel_index_ipv6; if (PREDICT_FALSE (tunnel_index1 != ~0)) goto forward1; goto trace1; } /* Correct version and has the space. It can only be unknown * message type. */ error1 = GTPU_ERROR_UNSUPPORTED_TYPE; next1 = GTPU_INPUT_NEXT_DROP; /* This is an error/nonstandard packet * Check if it is to be forwarded. */ if (is_ip4) tunnel_index1 = gtm->unknown_type_forward_tunnel_index_ipv4; else tunnel_index1 = gtm->unknown_type_forward_tunnel_index_ipv6; if (PREDICT_FALSE (tunnel_index1 != ~0)) goto forward1; /* The packet is ipv6/not forwarded */ goto trace1; } /* Manipulate packet 1 */ if (is_ip4) { key4_1.src = ip4_1->src_address.as_u32; key4_1.teid = gtpu1->teid; /* Make sure GTPU tunnel exist according to packet SIP and teid * SIP identify a GTPU path, and teid identify a tunnel in a given GTPU path */ if (PREDICT_FALSE (key4_1.as_u64 != last_key4.as_u64)) { p1 = hash_get (gtm->gtpu4_tunnel_by_key, key4_1.as_u64); if (PREDICT_FALSE (p1 == NULL)) { error1 = GTPU_ERROR_NO_SUCH_TUNNEL; next1 = GTPU_INPUT_NEXT_DROP; tunnel_index1 = gtm->unknown_teid_forward_tunnel_index_ipv4; if (PREDICT_FALSE (tunnel_index1 != ~0)) goto forward1; goto trace1; } last_key4.as_u64 = key4_1.as_u64; tunnel_index1 = last_tunnel_index = p1[0]; } else tunnel_index1 = last_tunnel_index; t1 = pool_elt_at_index (gtm->tunnels, tunnel_index1); /* Validate GTPU tunnel encap-fib index against packet */ if (PREDICT_FALSE (validate_gtpu_fib (b1, t1, is_ip4) == 0)) { error1 = GTPU_ERROR_NO_SUCH_TUNNEL; next1 = GTPU_INPUT_NEXT_DROP; tunnel_index1 = gtm->unknown_teid_forward_tunnel_index_ipv4; if (PREDICT_FALSE (tunnel_index1 != ~0)) goto forward1; goto trace1; } /* Validate GTPU tunnel SIP against packet DIP */ if (PREDICT_TRUE (ip4_1->dst_address.as_u32 == t1->src.ip4.as_u32)) goto next1; /* valid packet */ if (PREDICT_FALSE (ip4_address_is_multicast (&ip4_1->dst_address))) { key4_1.src = ip4_1->dst_address.as_u32; key4_1.teid = gtpu1->teid; /* Make sure mcast GTPU tunnel exist by packet DIP and teid */ p1 = hash_get (gtm->gtpu4_tunnel_by_key, key4_1.as_u64); if (PREDICT_TRUE (p1 != NULL)) { mt1 = pool_elt_at_index (gtm->tunnels, p1[0]); goto next1; /* valid packet */ } } error1 = GTPU_ERROR_NO_SUCH_TUNNEL; next1 = GTPU_INPUT_NEXT_DROP; tunnel_index1 = gtm->unknown_teid_forward_tunnel_index_ipv4; if (PREDICT_FALSE (tunnel_index1 != ~0)) goto forward1; goto trace1; } else /* !is_ip4 */ { key6_1.src.as_u64[0] = ip6_1->src_address.as_u64[0]; key6_1.src.as_u64[1] = ip6_1->src_address.as_u64[1]; key6_1.teid = gtpu1->teid; /* Make sure GTPU tunnel exist according to packet SIP and teid * SIP identify a GTPU path, and teid identify a tunnel in a given GTPU path */ if (PREDICT_FALSE (memcmp(&key6_1, &last_key6, sizeof(last_key6)) != 0)) { p1 = hash_get_mem (gtm->gtpu6_tunnel_by_key, &key6_1); if (PREDICT_FALSE (p1 == NULL)) { error1 = GTPU_ERROR_NO_SUCH_TUNNEL; next1 = GTPU_INPUT_NEXT_DROP; tunnel_index1 = gtm->unknown_teid_forward_tunnel_index_ipv6; if (PREDICT_FALSE (tunnel_index1 != ~0)) goto forward1; goto trace1; } clib_memcpy_fast (&last_key6, &key6_1, sizeof (key6_1)); tunnel_index1 = last_tunnel_index = p1[0]; } else tunnel_index1 = last_tunnel_index; t1 = pool_elt_at_index (gtm->tunnels, tunnel_index1); /* Validate GTPU tunnel encap-fib index against packet */ if (PREDICT_FALSE (validate_gtpu_fib (b1, t1, is_ip4) == 0)) { error1 = GTPU_ERROR_NO_SUCH_TUNNEL; next1 = GTPU_INPUT_NEXT_DROP; tunnel_index1 = gtm->unknown_teid_forward_tunnel_index_ipv6; if (PREDICT_FALSE (tunnel_index1 != ~0)) goto forward1; goto trace1; } /* Validate GTPU tunnel SIP against packet DIP */ if (PREDICT_TRUE (ip6_address_is_equal (&ip6_1->dst_address, &t1->src.ip6))) goto next1; /* valid packet */ if (PREDICT_FALSE (ip6_address_is_multicast (&ip6_1->dst_address))) { key6_1.src.as_u64[0] = ip6_1->dst_address.as_u64[0]; key6_1.src.as_u64[1] = ip6_1->dst_address.as_u64[1]; key6_1.teid = gtpu1->teid; p1 = hash_get_mem (gtm->gtpu6_tunnel_by_key, &key6_1); if (PREDICT_TRUE (p1 != NULL)) { mt1 = pool_elt_at_index (gtm->tunnels, p1[0]); goto next1; /* valid packet */ } } error1 = GTPU_ERROR_NO_SUCH_TUNNEL; next1 = GTPU_INPUT_NEXT_DROP; tunnel_index1 = gtm->unknown_teid_forward_tunnel_index_ipv6; if (PREDICT_FALSE (tunnel_index1 != ~0)) goto forward1; goto trace1; } forward1: /* Get the tunnel */ t1 = pool_elt_at_index (gtm->tunnels, tunnel_index1); /* Validate GTPU tunnel encap-fib index against packet */ if (PREDICT_FALSE (validate_gtpu_fib (b1, t1, is_ip4) == 0)) { error1 = GTPU_ERROR_NO_ERROR_TUNNEL; next1 = GTPU_INPUT_NEXT_DROP; goto trace1; } /* Clear the error, next0 will be overwritten by the tunnel */ error1 = 0; if (is_ip4) { /* Forward packet instead. Push the IP+UDP header */ gtpu_hdr_len1 = -(i32) (sizeof (udp_header_t) + sizeof (ip4_header_t)); /* Backup the IP4 checksum and address */ sum1 = ip4_1->checksum; old1 = ip4_1->dst_address.as_u32; /* Update IP address of the packet using the src from the tunnel */ ip4_1->dst_address.as_u32 = t1->src.ip4.as_u32; /* Fix the IP4 checksum */ sum1 = ip_csum_update (sum1, old1, ip4_1->dst_address.as_u32, ip4_header_t, dst_address /* changed member */); ip4_1->checksum = ip_csum_fold (sum1); } else { /* Forward packet instead. Push the IP+UDP header */ gtpu_hdr_len1 = -(i32) (sizeof (udp_header_t) + sizeof (ip6_header_t)); /* IPv6 UDP checksum is mandatory */ int bogus = 0; udp1->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b1, ip6_1, &bogus); if (udp1->checksum == 0) udp1->checksum = 0xffff; } next1: /* Pop gtpu header / push IP+UDP header */ vlib_buffer_advance (b1, gtpu_hdr_len1); next1 = t1->decap_next_index; sw_if_index1 = t1->sw_if_index; len1 = vlib_buffer_length_in_chain (vm, b1); /* Required to make the l2 tag push / pop code work on l2 subifs */ if (PREDICT_TRUE(next1 == GTPU_INPUT_NEXT_L2_INPUT)) vnet_update_l2_len (b1); /* Set packet input sw_if_index to unicast GTPU tunnel for learning */ vnet_buffer(b1)->sw_if_index[VLIB_RX] = sw_if_index1; sw_if_index1 = (mt1) ? mt1->sw_if_index : sw_if_index1; pkts_decapsulated ++; stats_n_packets += 1; stats_n_bytes += len1; /* Batch stats increment on the same gtpu tunnel so counter is not incremented per packet */ if (PREDICT_FALSE (sw_if_index1 != stats_sw_if_index)) { stats_n_packets -= 1; stats_n_bytes -= len1; if (stats_n_packets) vlib_increment_combined_counter (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX, thread_index, stats_sw_if_index, stats_n_packets, stats_n_bytes); stats_n_packets = 1; stats_n_bytes = len1; stats_sw_if_index = sw_if_index1; } trace1: b1->error = error1 ? node->errors[error1] : 0; if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED)) { gtpu_rx_trace_t *tr = vlib_add_trace (vm, node, b1, sizeof (*tr)); tr->next_index = next1; tr->error = error1; tr->tunnel_index = tunnel_index1; tr->teid = has_space1 ? clib_net_to_host_u32(gtpu1->teid) : ~0; if (vlib_buffer_has_space (b1, 4)) { tr->header.ver_flags = gtpu1->ver_flags; tr->header.type = gtpu1->type; tr->header.length = clib_net_to_host_u16 (gtpu1->length); } } vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next, n_left_to_next, bi0, bi1, next0, next1); } /* In case there are less than 4 packets left in frame and packets in current frame aka single processing */ while (n_left_from > 0 && n_left_to_next > 0) { u32 bi0; vlib_buffer_t * b0; u32 next0; ip4_header_t * ip4_0; ip6_header_t * ip6_0; gtpu_header_t * gtpu0; i32 gtpu_hdr_len0; uword * p0; u32 tunnel_index0; gtpu_tunnel_t * t0, * mt0 = NULL; gtpu4_tunnel_key_t key4_0; gtpu6_tunnel_key_t key6_0; u32 error0; u32 sw_if_index0, len0; u8 has_space0; u8 ver0; udp_header_t *udp0; ip_csum_t sum0; u32 old0; gtpu_ext_header_t ext = { .type = 0, .len = 0, .pad = 0 }; gtpu_ext_header_t *ext0; bool is_fast_track0; ext0 = &ext; 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); /* udp leaves current_data pointing at the gtpu header */ gtpu0 = vlib_buffer_get_current (b0); if (is_ip4) { ip4_0 = (void *)((u8*)gtpu0 - sizeof(udp_header_t) - sizeof(ip4_header_t)); } else { ip6_0 = (void *)((u8*)gtpu0 - sizeof(udp_header_t) - sizeof(ip6_header_t)); } udp0 = (void *) ((u8 *) gtpu0 - sizeof (udp_header_t)); tunnel_index0 = ~0; error0 = 0; /* speculatively load gtp header version field */ ver0 = gtpu0->ver_flags; /* * Manipulate gtpu header * TBD: Manipulate Sequence Number and N-PDU Number * TBD: Manipulate Next Extension Header */ is_fast_track0 = ((ver0 & (GTPU_VER_MASK | GTPU_PT_BIT | GTPU_RES_BIT)) == (GTPU_V1_VER | GTPU_PT_BIT)); is_fast_track0 = is_fast_track0 & (gtpu0->type == 255); ext0 = (ver0 & GTPU_E_BIT) ? (gtpu_ext_header_t *) >pu0->next_ext_type : &ext; gtpu_hdr_len0 = sizeof (gtpu_header_t) - (((ver0 & GTPU_E_S_PN_BIT) == 0) * 4) + ext0->len * 4; ext0 += ext0->len * 4 / sizeof (*ext0); has_space0 = vlib_buffer_has_space (b0, gtpu_hdr_len0); if (PREDICT_FALSE ((!is_fast_track0) | (!has_space0))) { /* Not fast path. ext0 and gtpu_hdr_len0 might be wrong */ /* GCC will hopefully fix the duplicate compute */ if (PREDICT_FALSE ( !((ver0 & (GTPU_VER_MASK | GTPU_PT_BIT | GTPU_RES_BIT)) == (GTPU_V1_VER | GTPU_PT_BIT)) | (!has_space0))) { /* The header or size is wrong */ error0 = has_space0 ? GTPU_ERROR_BAD_VER : GTPU_ERROR_TOO_SMALL; next0 = GTPU_INPUT_NEXT_DROP; /* This is an unsupported/bad packet. * Check if it is to be forwarded. */ if (is_ip4) tunnel_index0 = gtm->bad_header_forward_tunnel_index_ipv4; else tunnel_index0 = gtm->bad_header_forward_tunnel_index_ipv6; if (PREDICT_FALSE (tunnel_index0 != ~0)) goto forward00; goto trace00; } /* Correct version and has the space. It can only be unknown * message type */ error0 = GTPU_ERROR_UNSUPPORTED_TYPE; next0 = GTPU_INPUT_NEXT_DROP; /* This is an error/nonstandard packet * Check if it is to be forwarded. */ if (is_ip4) tunnel_index0 = gtm->unknown_type_forward_tunnel_index_ipv4; else tunnel_index0 = gtm->unknown_type_forward_tunnel_index_ipv6; if (PREDICT_FALSE (tunnel_index0 != ~0)) goto forward00; /* The packet is ipv6/not forwarded */ goto trace00; } if (is_ip4) { key4_0.src = ip4_0->src_address.as_u32; key4_0.teid = gtpu0->teid; /* Make sure GTPU tunnel exist according to packet SIP and teid * SIP identify a GTPU path, and teid identify a tunnel in a * given GTPU path */ if (PREDICT_FALSE (key4_0.as_u64 != last_key4.as_u64)) { // Cache miss, so try normal lookup now. p0 = hash_get (gtm->gtpu4_tunnel_by_key, key4_0.as_u64); if (PREDICT_FALSE (p0 == NULL)) { error0 = GTPU_ERROR_NO_SUCH_TUNNEL; next0 = GTPU_INPUT_NEXT_DROP; /* This is a standard packet, but no tunnel was found. * Check if it is to be forwarded. */ tunnel_index0 = gtm->unknown_teid_forward_tunnel_index_ipv4; if (PREDICT_FALSE (tunnel_index0 != ~0)) goto forward00; goto trace00; } // Update the key/tunnel cache for normal packets last_key4.as_u64 = key4_0.as_u64; tunnel_index0 = last_tunnel_index = p0[0]; } else tunnel_index0 = last_tunnel_index; t0 = pool_elt_at_index (gtm->tunnels, tunnel_index0); /* Validate GTPU tunnel encap-fib index against packet */ if (PREDICT_FALSE (validate_gtpu_fib (b0, t0, is_ip4) == 0)) { error0 = GTPU_ERROR_NO_SUCH_TUNNEL; next0 = GTPU_INPUT_NEXT_DROP; tunnel_index0 = gtm->unknown_teid_forward_tunnel_index_ipv4; if (PREDICT_FALSE (tunnel_index0 != ~0)) goto forward00; goto trace00; } /* Validate GTPU tunnel SIP against packet DIP */ if (PREDICT_TRUE (ip4_0->dst_address.as_u32 == t0->src.ip4.as_u32)) goto next00; /* valid packet */ if (PREDICT_FALSE ( ip4_address_is_multicast (&ip4_0->dst_address))) { key4_0.src = ip4_0->dst_address.as_u32; key4_0.teid = gtpu0->teid; /* Make sure mcast GTPU tunnel exist by packet DIP and teid */ p0 = hash_get (gtm->gtpu4_tunnel_by_key, key4_0.as_u64); if (PREDICT_TRUE (p0 != NULL)) { mt0 = pool_elt_at_index (gtm->tunnels, p0[0]); goto next00; /* valid packet */ } } error0 = GTPU_ERROR_NO_SUCH_TUNNEL; next0 = GTPU_INPUT_NEXT_DROP; tunnel_index0 = gtm->unknown_teid_forward_tunnel_index_ipv4; if (PREDICT_FALSE (tunnel_index0 != ~0)) goto forward00; goto trace00; } else /* !is_ip4 */ { key6_0.src.as_u64[0] = ip6_0->src_address.as_u64[0]; key6_0.src.as_u64[1] = ip6_0->src_address.as_u64[1]; key6_0.teid = gtpu0->teid; /* Make sure GTPU tunnel exist according to packet SIP and teid * SIP identify a GTPU path, and teid identify a tunnel in a * given GTPU path */ if (PREDICT_FALSE ( memcmp (&key6_0, &last_key6, sizeof (last_key6)) != 0)) { p0 = hash_get_mem (gtm->gtpu6_tunnel_by_key, &key6_0); if (PREDICT_FALSE (p0 == NULL)) { error0 = GTPU_ERROR_NO_SUCH_TUNNEL; next0 = GTPU_INPUT_NEXT_DROP; tunnel_index0 = gtm->unknown_teid_forward_tunnel_index_ipv6; if (PREDICT_FALSE (tunnel_index0 != ~0)) goto forward00; goto trace00; } clib_memcpy_fast (&last_key6, &key6_0, sizeof (key6_0)); tunnel_index0 = last_tunnel_index = p0[0]; } else tunnel_index0 = last_tunnel_index; t0 = pool_elt_at_index (gtm->tunnels, tunnel_index0); /* Validate GTPU tunnel encap-fib index against packet */ if (PREDICT_FALSE (validate_gtpu_fib (b0, t0, is_ip4) == 0)) { error0 = GTPU_ERROR_NO_SUCH_TUNNEL; next0 = GTPU_INPUT_NEXT_DROP; tunnel_index0 = gtm->unknown_teid_forward_tunnel_index_ipv6; if (PREDICT_FALSE (tunnel_index0 != ~0)) goto forward00; goto trace00; } /* Validate GTPU tunnel SIP against packet DIP */ if (PREDICT_TRUE ( ip6_address_is_equal (&ip6_0->dst_address, &t0->src.ip6))) goto next00; /* valid packet */ if (PREDICT_FALSE (ip6_address_is_multicast (&ip6_0->dst_address))) { key6_0.src.as_u64[0] = ip6_0->dst_address.as_u64[0]; key6_0.src.as_u64[1] = ip6_0->dst_address.as_u64[1]; key6_0.teid = gtpu0->teid; p0 = hash_get_mem (gtm->gtpu6_tunnel_by_key, &key6_0); if (PREDICT_TRUE (p0 != NULL)) { mt0 = pool_elt_at_index (gtm->tunnels, p0[0]); goto next00; /* valid packet */ } } error0 = GTPU_ERROR_NO_SUCH_TUNNEL; next0 = GTPU_INPUT_NEXT_DROP; tunnel_index0 = gtm->unknown_teid_forward_tunnel_index_ipv6; if (PREDICT_FALSE (tunnel_index0 != ~0)) goto forward00; goto trace00; } /* This can only be reached via goto */ forward00: // Get the tunnel t0 = pool_elt_at_index (gtm->tunnels, tunnel_index0); /* Validate GTPU tunnel encap-fib index against packet */ if (PREDICT_FALSE (validate_gtpu_fib (b0, t0, is_ip4) == 0)) { error0 = GTPU_ERROR_NO_ERROR_TUNNEL; next0 = GTPU_INPUT_NEXT_DROP; goto trace00; } /* Clear the error, next0 will be overwritten by the tunnel */ error0 = 0; if (is_ip4) { /* Forward packet instead. Push the IP+UDP header */ gtpu_hdr_len0 = -(i32) (sizeof (udp_header_t) + sizeof (ip4_header_t)); /* Backup the IP4 checksum and address */ sum0 = ip4_0->checksum; old0 = ip4_0->dst_address.as_u32; /* Update IP address of the packet using the src from the tunnel */ ip4_0->dst_address.as_u32 = t0->src.ip4.as_u32; /* Fix the IP4 checksum */ sum0 = ip_csum_update (sum0, old0, ip4_0->dst_address.as_u32, ip4_header_t, dst_address /* changed member */); ip4_0->checksum = ip_csum_fold (sum0); } else { /* Forward packet instead. Push the IP+UDP header */ gtpu_hdr_len0 = -(i32) (sizeof (udp_header_t) + sizeof (ip6_header_t)); /* IPv6 UDP checksum is mandatory */ int bogus = 0; udp0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ip6_0, &bogus); if (udp0->checksum == 0) udp0->checksum = 0xffff; } next00: /* Pop gtpu header / push IP+UDP header */ vlib_buffer_advance (b0, gtpu_hdr_len0); next0 = t0->decap_next_index; sw_if_index0 = t0->sw_if_index; len0 = vlib_buffer_length_in_chain (vm, b0); /* Required to make the l2 tag push / pop code work on l2 subifs */ if (PREDICT_TRUE(next0 == GTPU_INPUT_NEXT_L2_INPUT)) vnet_update_l2_len (b0); /* Set packet input sw_if_index to unicast GTPU tunnel for learning */ vnet_buffer(b0)->sw_if_index[VLIB_RX] = sw_if_index0; sw_if_index0 = (mt0) ? mt0->sw_if_index : sw_if_index0; pkts_decapsulated ++; stats_n_packets += 1; stats_n_bytes += len0; /* Batch stats increment on the same gtpu tunnel so counter is not incremented per packet */ if (PREDICT_FALSE (sw_if_index0 != stats_sw_if_index)) { stats_n_packets -= 1; stats_n_bytes -= len0; if (stats_n_packets) vlib_increment_combined_counter (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX, thread_index, stats_sw_if_index, stats_n_packets, stats_n_bytes); stats_n_packets = 1; stats_n_bytes = len0; stats_sw_if_index = sw_if_index0; } trace00: b0->error = error0 ? node->errors[error0] : 0; if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) { gtpu_rx_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof (*tr)); tr->next_index = next0; tr->error = error0; tr->tunnel_index = tunnel_index0; tr->teid = has_space0 ? clib_net_to_host_u32(gtpu0->teid) : ~0; if (vlib_buffer_has_space (b0, 4)) { tr->header.ver_flags = gtpu0->ver_flags; tr->header.type = gtpu0->type; tr->header.length = clib_net_to_host_u16 (gtpu0->length); } } 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); } /* Do we still need this now that tunnel tx stats is kept? */ vlib_node_increment_counter (vm, is_ip4? gtpu4_input_node.index:gtpu6_input_node.index, GTPU_ERROR_DECAPSULATED, pkts_decapsulated); /* Increment any remaining batch stats */ if (stats_n_packets) { vlib_increment_combined_counter (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX, thread_index, stats_sw_if_index, stats_n_packets, stats_n_bytes); node->runtime_data[0] = stats_sw_if_index; } return from_frame->n_vectors; } VLIB_NODE_FN (gtpu4_input_node) (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame) { return gtpu_input(vm, node, from_frame, /* is_ip4 */ 1); } VLIB_NODE_FN (gtpu6_input_node) (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame) { return gtpu_input(vm, node, from_frame, /* is_ip4 */ 0); } static char * gtpu_error_strings[] = { #define gtpu_error(n,s) s, #include #undef gtpu_error #undef _ }; VLIB_REGISTER_NODE (gtpu4_input_node) = { .name = "gtpu4-input", /* Takes a vector of packets. */ .vector_size = sizeof (u32), .n_errors = GTPU_N_ERROR, .error_strings = gtpu_error_strings, .n_next_nodes = GTPU_INPUT_N_NEXT, .next_nodes = { #define _(s,n) [GTPU_INPUT_NEXT_##s] = n, foreach_gtpu_input_next #undef _ }, //temp .format_buffer = format_gtpu_header, .format_trace = format_gtpu_rx_trace, // $$$$ .unformat_buffer = unformat_gtpu_header, }; VLIB_REGISTER_NODE (gtpu6_input_node) = { .name = "gtpu6-input", /* Takes a vector of packets. */ .vector_size = sizeof (u32), .n_errors = GTPU_N_ERROR, .error_strings = gtpu_error_strings, .n_next_nodes = GTPU_INPUT_N_NEXT, .next_nodes = { #define _(s,n) [GTPU_INPUT_NEXT_##s] = n, foreach_gtpu_input_next #undef _ }, //temp .format_buffer = format_gtpu_header, .format_trace = format_gtpu_rx_trace, // $$$$ .unformat_buffer = unformat_gtpu_header, }; typedef enum { IP_GTPU_BYPASS_NEXT_DROP, IP_GTPU_BYPASS_NEXT_GTPU, IP_GTPU_BYPASS_N_NEXT, } ip_vxan_bypass_next_t; /* this function determines if a udp packet is actually gtpu and needs forwarding to gtpu_input */ always_inline uword ip_gtpu_bypass_inline (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame, u32 is_ip4) { gtpu_main_t * gtm = >pu_main; u32 * from, * to_next, n_left_from, n_left_to_next, next_index; vlib_node_runtime_t * error_node = vlib_node_get_runtime (vm, ip4_input_node.index); vtep4_key_t last_vtep4; /* last IPv4 address / fib index matching a local VTEP address */ vtep6_key_t last_vtep6; /* last IPv6 address / fib index matching a local VTEP address */ vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs; from = vlib_frame_vector_args (frame); n_left_from = frame->n_vectors; next_index = node->cached_next_index; vlib_get_buffers (vm, from, bufs, n_left_from); if (node->flags & VLIB_NODE_FLAG_TRACE) ip4_forward_next_trace (vm, node, frame, VLIB_TX); if (is_ip4) vtep4_key_init (&last_vtep4); else vtep6_key_init (&last_vtep6); while (n_left_from > 0) { vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); while (n_left_from >= 4 && n_left_to_next >= 2) { vlib_buffer_t * b0, * b1; ip4_header_t * ip40, * ip41; ip6_header_t * ip60, * ip61; udp_header_t * udp0, * udp1; u32 bi0, ip_len0, udp_len0, flags0, next0; u32 bi1, ip_len1, udp_len1, flags1, next1; i32 len_diff0, len_diff1; u8 error0, good_udp0, proto0; u8 error1, good_udp1, proto1; /* Prefetch next iteration. */ { vlib_prefetch_buffer_header (b[2], LOAD); vlib_prefetch_buffer_header (b[3], LOAD); CLIB_PREFETCH (b[2]->data, 2*CLIB_CACHE_LINE_BYTES, LOAD); CLIB_PREFETCH (b[3]->data, 2*CLIB_CACHE_LINE_BYTES, LOAD); } bi0 = to_next[0] = from[0]; bi1 = to_next[1] = from[1]; from += 2; n_left_from -= 2; to_next += 2; n_left_to_next -= 2; b0 = b[0]; b1 = b[1]; b += 2; if (is_ip4) { ip40 = vlib_buffer_get_current (b0); ip41 = vlib_buffer_get_current (b1); } else { ip60 = vlib_buffer_get_current (b0); ip61 = vlib_buffer_get_current (b1); } /* Setup packet for next IP feature */ vnet_feature_next(&next0, b0); vnet_feature_next(&next1, b1); if (is_ip4) { /* Treat IP frag packets as "experimental" protocol for now until support of IP frag reassembly is implemented */ proto0 = ip4_is_fragment(ip40) ? 0xfe : ip40->protocol; proto1 = ip4_is_fragment(ip41) ? 0xfe : ip41->protocol; } else { proto0 = ip60->protocol; proto1 = ip61->protocol; } /* Process packet 0 */ if (proto0 != IP_PROTOCOL_UDP) goto exit0; /* not UDP packet */ if (is_ip4) udp0 = ip4_next_header (ip40); else udp0 = ip6_next_header (ip60); if (udp0->dst_port != clib_host_to_net_u16 (UDP_DST_PORT_GTPU)) goto exit0; /* not GTPU packet */ /* Validate DIP against VTEPs*/ if (is_ip4) { #ifdef CLIB_HAVE_VEC512 if (!vtep4_check_vector (>m->vtep_table, b0, ip40, &last_vtep4, >m->vtep4_u512)) #else if (!vtep4_check (>m->vtep_table, b0, ip40, &last_vtep4)) #endif goto exit0; /* no local VTEP for GTPU packet */ } else { if (!vtep6_check (>m->vtep_table, b0, ip60, &last_vtep6)) goto exit0; /* no local VTEP for GTPU packet */ } flags0 = b0->flags; good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0; /* Don't verify UDP checksum for packets with explicit zero checksum. */ good_udp0 |= udp0->checksum == 0; /* Verify UDP length */ if (is_ip4) ip_len0 = clib_net_to_host_u16 (ip40->length); else ip_len0 = clib_net_to_host_u16 (ip60->payload_length); udp_len0 = clib_net_to_host_u16 (udp0->length); len_diff0 = ip_len0 - udp_len0; /* Verify UDP checksum */ if (PREDICT_FALSE (!good_udp0)) { if ((flags0 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0) { if (is_ip4) flags0 = ip4_tcp_udp_validate_checksum (vm, b0); else flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, b0); good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0; } } if (is_ip4) { error0 = good_udp0 ? 0 : IP4_ERROR_UDP_CHECKSUM; error0 = (len_diff0 >= 0) ? error0 : IP4_ERROR_UDP_LENGTH; } else { error0 = good_udp0 ? 0 : IP6_ERROR_UDP_CHECKSUM; error0 = (len_diff0 >= 0) ? error0 : IP6_ERROR_UDP_LENGTH; } next0 = error0 ? IP_GTPU_BYPASS_NEXT_DROP : IP_GTPU_BYPASS_NEXT_GTPU; b0->error = error0 ? error_node->errors[error0] : 0; /* gtpu-input node expect current at GTPU header */ if (is_ip4) vlib_buffer_advance (b0, sizeof(ip4_header_t)+sizeof(udp_header_t)); else vlib_buffer_advance (b0, sizeof(ip6_header_t)+sizeof(udp_header_t)); exit0: /* Process packet 1 */ if (proto1 != IP_PROTOCOL_UDP) goto exit1; /* not UDP packet */ if (is_ip4) udp1 = ip4_next_header (ip41); else udp1 = ip6_next_header (ip61); if (udp1->dst_port != clib_host_to_net_u16 (UDP_DST_PORT_GTPU)) goto exit1; /* not GTPU packet */ /* Validate DIP against VTEPs*/ if (is_ip4) { #ifdef CLIB_HAVE_VEC512 if (!vtep4_check_vector (>m->vtep_table, b1, ip41, &last_vtep4, >m->vtep4_u512)) #else if (!vtep4_check (>m->vtep_table, b1, ip41, &last_vtep4)) #endif goto exit1; /* no local VTEP for GTPU packet */ } else { if (!vtep6_check (>m->vtep_table, b1, ip61, &last_vtep6)) goto exit1; /* no local VTEP for GTPU packet */ } flags1 = b1->flags; good_udp1 = (flags1 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0; /* Don't verify UDP checksum for packets with explicit zero checksum. */ good_udp1 |= udp1->checksum == 0; /* Verify UDP length */ if (is_ip4) ip_len1 = clib_net_to_host_u16 (ip41->length); else ip_len1 = clib_net_to_host_u16 (ip61->payload_length); udp_len1 = clib_net_to_host_u16 (udp1->length); len_diff1 = ip_len1 - udp_len1; /* Verify UDP checksum */ if (PREDICT_FALSE (!good_udp1)) { if ((flags1 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0) { if (is_ip4) flags1 = ip4_tcp_udp_validate_checksum (vm, b1); else flags1 = ip6_tcp_udp_icmp_validate_checksum (vm, b1); good_udp1 = (flags1 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0; } } if (is_ip4) { error1 = good_udp1 ? 0 : IP4_ERROR_UDP_CHECKSUM; error1 = (len_diff1 >= 0) ? error1 : IP4_ERROR_UDP_LENGTH; } else { error1 = good_udp1 ? 0 : IP6_ERROR_UDP_CHECKSUM; error1 = (len_diff1 >= 0) ? error1 : IP6_ERROR_UDP_LENGTH; } next1 = error1 ? IP_GTPU_BYPASS_NEXT_DROP : IP_GTPU_BYPASS_NEXT_GTPU; b1->error = error1 ? error_node->errors[error1] : 0; /* gtpu-input node expect current at GTPU header */ if (is_ip4) vlib_buffer_advance (b1, sizeof(ip4_header_t)+sizeof(udp_header_t)); else vlib_buffer_advance (b1, sizeof(ip6_header_t)+sizeof(udp_header_t)); exit1: vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next, n_left_to_next, bi0, bi1, next0, next1); } while (n_left_from > 0 && n_left_to_next > 0) { vlib_buffer_t * b0; ip4_header_t * ip40; ip6_header_t * ip60; udp_header_t * udp0; u32 bi0, ip_len0, udp_len0, flags0, next0; i32 len_diff0; u8 error0, good_udp0, proto0; bi0 = to_next[0] = from[0]; from += 1; n_left_from -= 1; to_next += 1; n_left_to_next -= 1; b0 = b[0]; b++; if (is_ip4) ip40 = vlib_buffer_get_current (b0); else ip60 = vlib_buffer_get_current (b0); /* Setup packet for next IP feature */ vnet_feature_next(&next0, b0); if (is_ip4) /* Treat IP4 frag packets as "experimental" protocol for now until support of IP frag reassembly is implemented */ proto0 = ip4_is_fragment(ip40) ? 0xfe : ip40->protocol; else proto0 = ip60->protocol; if (proto0 != IP_PROTOCOL_UDP) goto exit; /* not UDP packet */ if (is_ip4) udp0 = ip4_next_header (ip40); else udp0 = ip6_next_header (ip60); if (udp0->dst_port != clib_host_to_net_u16 (UDP_DST_PORT_GTPU)) goto exit; /* not GTPU packet */ /* Validate DIP against VTEPs*/ if (is_ip4) { #ifdef CLIB_HAVE_VEC512 if (!vtep4_check_vector (>m->vtep_table, b0, ip40, &last_vtep4, >m->vtep4_u512)) #else if (!vtep4_check (>m->vtep_table, b0, ip40, &last_vtep4)) #endif goto exit; /* no local VTEP for GTPU packet */ } else { if (!vtep6_check (>m->vtep_table, b0, ip60, &last_vtep6)) goto exit; /* no local VTEP for GTPU packet */ } flags0 = b0->flags; good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0; /* Don't verify UDP checksum for packets with explicit zero checksum. */ good_udp0 |= udp0->checksum == 0; /* Verify UDP length */ if (is_ip4) ip_len0 = clib_net_to_host_u16 (ip40->length); else ip_len0 = clib_net_to_host_u16 (ip60->payload_length); udp_len0 = clib_net_to_host_u16 (udp0->length); len_diff0 = ip_len0 - udp_len0; /* Verify UDP checksum */ if (PREDICT_FALSE (!good_udp0)) { if ((flags0 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0) { if (is_ip4) flags0 = ip4_tcp_udp_validate_checksum (vm, b0); else flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, b0); good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0; } } if (is_ip4) { error0 = good_udp0 ? 0 : IP4_ERROR_UDP_CHECKSUM; error0 = (len_diff0 >= 0) ? error0 : IP4_ERROR_UDP_LENGTH; } else { error0 = good_udp0 ? 0 : IP6_ERROR_UDP_CHECKSUM; error0 = (len_diff0 >= 0) ? error0 : IP6_ERROR_UDP_LENGTH; } next0 = error0 ? IP_GTPU_BYPASS_NEXT_DROP : IP_GTPU_BYPASS_NEXT_GTPU; b0->error = error0 ? error_node->errors[error0] : 0; /* gtpu-input node expect current at GTPU header */ if (is_ip4) vlib_buffer_advance (b0, sizeof(ip4_header_t)+sizeof(udp_header_t)); else vlib_buffer_advance (b0, sizeof(ip6_header_t)+sizeof(udp_header_t)); exit: 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); } return frame->n_vectors; } VLIB_NODE_FN (ip4_gtpu_bypass_node) (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return ip_gtpu_bypass_inline (vm, node, frame, /* is_ip4 */ 1); } VLIB_REGISTER_NODE (ip4_gtpu_bypass_node) = { .name = "ip4-gtpu-bypass", .vector_size = sizeof (u32), .n_next_nodes = IP_GTPU_BYPASS_N_NEXT, .next_nodes = { [IP_GTPU_BYPASS_NEXT_DROP] = "error-drop", [IP_GTPU_BYPASS_NEXT_GTPU] = "gtpu4-input", }, .format_buffer = format_ip4_header, .format_trace = format_ip4_forward_next_trace, }; #ifndef CLIB_MARCH_VARIANT /* Dummy init function to get us linked in. */ clib_error_t * ip4_gtpu_bypass_init (vlib_main_t * vm) { return 0; } VLIB_INIT_FUNCTION (ip4_gtpu_bypass_init); #endif /* CLIB_MARCH_VARIANT */ VLIB_NODE_FN (ip6_gtpu_bypass_node) (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return ip_gtpu_bypass_inline (vm, node, frame, /* is_ip4 */ 0); } VLIB_REGISTER_NODE (ip6_gtpu_bypass_node) = { .name = "ip6-gtpu-bypass", .vector_size = sizeof (u32), .n_next_nodes = IP_GTPU_BYPASS_N_NEXT, .next_nodes = { [IP_GTPU_BYPASS_NEXT_DROP] = "error-drop", [IP_GTPU_BYPASS_NEXT_GTPU] = "gtpu6-input", }, .format_buffer = format_ip6_header, .format_trace = format_ip6_forward_next_trace, }; #ifndef CLIB_MARCH_VARIANT /* Dummy init function to get us linked in. */ clib_error_t * ip6_gtpu_bypass_init (vlib_main_t * vm) { return 0; } VLIB_INIT_FUNCTION (ip6_gtpu_bypass_init); #define foreach_gtpu_flow_error \ _(NONE, "no error") \ _(PAYLOAD_ERROR, "Payload type errors") \ _(IP_CHECKSUM_ERROR, "Rx ip checksum errors") \ _(IP_HEADER_ERROR, "Rx ip header errors") \ _(UDP_CHECKSUM_ERROR, "Rx udp checksum errors") \ _(UDP_LENGTH_ERROR, "Rx udp length errors") typedef enum { #define _(f,s) GTPU_FLOW_ERROR_##f, foreach_gtpu_flow_error #undef _ #define gtpu_error(n,s) GTPU_FLOW_ERROR_##n, #include #undef gtpu_error GTPU_FLOW_N_ERROR, } gtpu_flow_error_t; static char *gtpu_flow_error_strings[] = { #define _(n,s) s, foreach_gtpu_flow_error #undef _ #define gtpu_error(n,s) s, #include #undef gtpu_error #undef _ }; #define gtpu_local_need_csum_check(_b) \ (!(_b->flags & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED || \ (_b->flags & VNET_BUFFER_F_OFFLOAD && \ vnet_buffer (_b)->oflags & VNET_BUFFER_OFFLOAD_F_UDP_CKSUM))) #define gtpu_local_csum_is_valid(_b) \ ((_b->flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT || \ (_b->flags & VNET_BUFFER_F_OFFLOAD && \ vnet_buffer (_b)->oflags & VNET_BUFFER_OFFLOAD_F_UDP_CKSUM)) != 0) static_always_inline u8 gtpu_validate_udp_csum (vlib_main_t * vm, vlib_buffer_t *b) { u32 flags = b->flags; enum { offset = sizeof(ip4_header_t) + sizeof(udp_header_t)}; /* Verify UDP checksum */ if ((flags & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0) { vlib_buffer_advance (b, -offset); flags = ip4_tcp_udp_validate_checksum (vm, b); vlib_buffer_advance (b, offset); } return (flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0; } static_always_inline u8 gtpu_check_ip (vlib_buffer_t *b, u16 payload_len) { ip4_header_t * ip4_hdr = vlib_buffer_get_current(b) - sizeof(ip4_header_t) - sizeof(udp_header_t); u16 ip_len = clib_net_to_host_u16 (ip4_hdr->length); u16 expected = payload_len + sizeof(ip4_header_t) + sizeof(udp_header_t); return ip_len > expected || ip4_hdr->ttl == 0 || ip4_hdr->ip_version_and_header_length != 0x45; } static_always_inline u8 gtpu_check_ip_udp_len (vlib_buffer_t *b) { ip4_header_t * ip4_hdr = vlib_buffer_get_current(b) - sizeof(ip4_header_t) - sizeof(udp_header_t); udp_header_t * udp_hdr = vlib_buffer_get_current(b) - sizeof(udp_header_t); u16 ip_len = clib_net_to_host_u16 (ip4_hdr->length); u16 udp_len = clib_net_to_host_u16 (udp_hdr->length); return udp_len > ip_len; } static_always_inline u8 gtpu_err_code (u8 ip_err0, u8 udp_err0, u8 csum_err0) { u8 error0 = GTPU_FLOW_ERROR_NONE; if (ip_err0) error0 = GTPU_FLOW_ERROR_IP_HEADER_ERROR; if (udp_err0) error0 = GTPU_FLOW_ERROR_UDP_LENGTH_ERROR; if (csum_err0) error0 = GTPU_FLOW_ERROR_UDP_CHECKSUM_ERROR; return error0; } always_inline uword gtpu_flow_input (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame) { u32 n_left_from, next_index, * from, * to_next; gtpu_main_t * gtm = >pu_main; vnet_main_t * vnm = gtm->vnet_main; vnet_interface_main_t * im = &vnm->interface_main; u32 pkts_decapsulated = 0; u32 thread_index = vlib_get_thread_index(); u32 stats_sw_if_index, stats_n_packets, stats_n_bytes; u8 ip_err0, ip_err1, udp_err0, udp_err1, csum_err0, csum_err1; from = vlib_frame_vector_args (from_frame); n_left_from = from_frame->n_vectors; next_index = node->cached_next_index; stats_sw_if_index = node->runtime_data[0]; stats_n_packets = stats_n_bytes = 0; 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 >= 4 && n_left_to_next >= 2) { u32 bi0, bi1; vlib_buffer_t * b0, * b1; u32 next0, next1; gtpu_header_t * gtpu0, * gtpu1; u32 gtpu_hdr_len0, gtpu_hdr_len1; u32 tunnel_index0, tunnel_index1; gtpu_tunnel_t * t0, * t1; u32 error0, error1; u32 sw_if_index0, sw_if_index1, len0, len1; u8 has_space0 = 0, has_space1 = 0; u8 ver0, ver1; gtpu_ext_header_t ext = { .type = 0, .len = 0, .pad = 0 }; gtpu_ext_header_t *ext0, *ext1; bool is_fast_track0, is_fast_track1; ext0 = ext1 = &ext; /* Prefetch next iteration. */ { vlib_buffer_t *p2, *p3; p2 = vlib_get_buffer (vm, from[2]); p3 = vlib_get_buffer (vm, from[3]); vlib_prefetch_buffer_header (p2, LOAD); vlib_prefetch_buffer_header (p3, LOAD); CLIB_PREFETCH (p2->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD); CLIB_PREFETCH (p3->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD); } bi0 = from[0]; bi1 = from[1]; to_next[0] = bi0; to_next[1] = bi1; from += 2; to_next += 2; n_left_to_next -= 2; n_left_from -= 2; b0 = vlib_get_buffer (vm, bi0); b1 = vlib_get_buffer (vm, bi1); /* udp leaves current_data pointing at the gtpu header */ gtpu0 = vlib_buffer_get_current (b0); gtpu1 = vlib_buffer_get_current (b1); len0 = vlib_buffer_length_in_chain (vm, b0); len1 = vlib_buffer_length_in_chain (vm, b1); tunnel_index0 = ~0; error0 = 0; tunnel_index1 = ~0; error1 = 0; ip_err0 = gtpu_check_ip (b0, len0); udp_err0 = gtpu_check_ip_udp_len (b0); ip_err1 = gtpu_check_ip (b1, len1); udp_err1 = gtpu_check_ip_udp_len (b1); if (PREDICT_FALSE (gtpu_local_need_csum_check (b0))) csum_err0 = !gtpu_validate_udp_csum (vm, b0); else csum_err0 = !gtpu_local_csum_is_valid (b0); if (PREDICT_FALSE (gtpu_local_need_csum_check (b1))) csum_err1 = !gtpu_validate_udp_csum (vm, b1); else csum_err1 = !gtpu_local_csum_is_valid (b1); /* speculatively load gtp header version field */ ver0 = gtpu0->ver_flags; ver1 = gtpu1->ver_flags; /* * Manipulate gtpu header * TBD: Manipulate Sequence Number and N-PDU Number * TBD: Manipulate Next Extension Header */ is_fast_track0 = ((ver0 & (GTPU_VER_MASK | GTPU_PT_BIT | GTPU_RES_BIT)) == (GTPU_V1_VER | GTPU_PT_BIT)); is_fast_track0 = is_fast_track0 & (gtpu0->type == 255); is_fast_track1 = ((ver1 & (GTPU_VER_MASK | GTPU_PT_BIT | GTPU_RES_BIT)) == (GTPU_V1_VER | GTPU_PT_BIT)); is_fast_track1 = is_fast_track1 & (gtpu1->type == 255); ext0 = (ver0 & GTPU_E_BIT) ? (gtpu_ext_header_t *) >pu0->next_ext_type : &ext; ext1 = (ver1 & GTPU_E_BIT) ? (gtpu_ext_header_t *) >pu1->next_ext_type : &ext; gtpu_hdr_len0 = sizeof (gtpu_header_t) - (((ver0 & GTPU_E_S_PN_BIT) == 0) * 4) + ext0->len * 4; gtpu_hdr_len1 = sizeof (gtpu_header_t) - (((ver1 & GTPU_E_S_PN_BIT) == 0) * 4) + ext1->len * 4; /* Only for clarity, will be optimized away */ ext0 += ext0->len * 4 / sizeof (*ext0); ext1 += ext1->len * 4 / sizeof (*ext1); has_space0 = vlib_buffer_has_space (b0, gtpu_hdr_len0); has_space1 = vlib_buffer_has_space (b1, gtpu_hdr_len1); if (ip_err0 || udp_err0 || csum_err0) { next0 = GTPU_INPUT_NEXT_DROP; error0 = gtpu_err_code (ip_err0, udp_err0, csum_err0); goto trace0; } /* Diverge the packet paths for 0 and 1 */ if (PREDICT_FALSE ((!is_fast_track0) | (!has_space0))) { /* Not fast path. ext0 and gtpu_hdr_len0 might be wrong */ /* GCC will hopefully fix the duplicate compute */ if (PREDICT_FALSE ( !((ver0 & (GTPU_VER_MASK | GTPU_PT_BIT | GTPU_RES_BIT)) == (GTPU_V1_VER | GTPU_PT_BIT)) | (!has_space0))) { /* The header or size is wrong */ error0 = has_space0 ? GTPU_ERROR_BAD_VER : GTPU_ERROR_TOO_SMALL; next0 = GTPU_INPUT_NEXT_DROP; goto trace0; } /* Correct version and has the space. It can only be unknown * message type. */ error0 = GTPU_ERROR_UNSUPPORTED_TYPE; next0 = GTPU_INPUT_NEXT_DROP; /* The packet is not forwarded */ goto trace0; } /* Manipulate packet 0 */ ASSERT (b0->flow_id != 0); tunnel_index0 = b0->flow_id - gtm->flow_id_start; t0 = pool_elt_at_index (gtm->tunnels, tunnel_index0); b0->flow_id = 0; /* Pop gtpu header */ vlib_buffer_advance (b0, gtpu_hdr_len0); /* assign the next node */ if (PREDICT_FALSE (t0->decap_next_index != GTPU_INPUT_NEXT_IP4_INPUT) && (t0->decap_next_index != GTPU_INPUT_NEXT_IP6_INPUT)) { error0 = GTPU_FLOW_ERROR_PAYLOAD_ERROR; next0 = GTPU_INPUT_NEXT_DROP; goto trace0; } next0 = t0->decap_next_index; sw_if_index0 = t0->sw_if_index; /* Set packet input sw_if_index to unicast GTPU tunnel for learning */ vnet_buffer (b0)->sw_if_index[VLIB_RX] = sw_if_index0; pkts_decapsulated++; stats_n_packets += 1; stats_n_bytes += len0; /* Batch stats increment on the same gtpu tunnel so counter is not incremented per packet */ if (PREDICT_FALSE (sw_if_index0 != stats_sw_if_index)) { stats_n_packets -= 1; stats_n_bytes -= len0; if (stats_n_packets) vlib_increment_combined_counter ( im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX, thread_index, stats_sw_if_index, stats_n_packets, stats_n_bytes); stats_n_packets = 1; stats_n_bytes = len0; stats_sw_if_index = sw_if_index0; } trace0: b0->error = error0 ? node->errors[error0] : 0; if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) { gtpu_rx_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof (*tr)); tr->next_index = next0; tr->error = error0; tr->tunnel_index = tunnel_index0; tr->teid = has_space0 ? clib_net_to_host_u32(gtpu0->teid) : ~0; if (vlib_buffer_has_space (b0, 4)) { tr->header.ver_flags = gtpu0->ver_flags; tr->header.type = gtpu0->type; tr->header.length = clib_net_to_host_u16 (gtpu0->length); } } if (ip_err1 || udp_err1 || csum_err1) { next1 = GTPU_INPUT_NEXT_DROP; error1 = gtpu_err_code (ip_err1, udp_err1, csum_err1); goto trace1; } /* * Manipulate gtpu header * TBD: Manipulate Sequence Number and N-PDU Number * TBD: Manipulate Next Extension Header */ if (PREDICT_FALSE ((!is_fast_track1) | (!has_space1))) { /* Not fast path. ext1 and gtpu_hdr_len1 might be wrong */ /* GCC will hopefully fix the duplicate compute */ if (PREDICT_FALSE ( !((ver1 & (GTPU_VER_MASK | GTPU_PT_BIT | GTPU_RES_BIT)) == (GTPU_V1_VER | GTPU_PT_BIT)) | (!has_space1))) { /* The header or size is wrong */ error1 = has_space1 ? GTPU_ERROR_BAD_VER : GTPU_ERROR_TOO_SMALL; next1 = GTPU_INPUT_NEXT_DROP; goto trace1; } /* Correct version and has the space. It can only be unknown * message type. */ error1 = GTPU_ERROR_UNSUPPORTED_TYPE; next1 = GTPU_INPUT_NEXT_DROP; /* The packet is not forwarded */ goto trace1; } /* Manipulate packet 1 */ ASSERT (b1->flow_id != 0); tunnel_index1 = b1->flow_id - gtm->flow_id_start; t1 = pool_elt_at_index (gtm->tunnels, tunnel_index1); b1->flow_id = 0; /* Pop gtpu header */ vlib_buffer_advance (b1, gtpu_hdr_len1); /* assign the next node */ if (PREDICT_FALSE (t1->decap_next_index != GTPU_INPUT_NEXT_IP4_INPUT) && (t1->decap_next_index != GTPU_INPUT_NEXT_IP6_INPUT)) { error1 = GTPU_FLOW_ERROR_PAYLOAD_ERROR; next1 = GTPU_INPUT_NEXT_DROP; goto trace1; } next1 = t1->decap_next_index; sw_if_index1 = t1->sw_if_index; /* Required to make the l2 tag push / pop code work on l2 subifs */ /* This won't happen in current implementation as only ipv4/udp/gtpu/IPV4 type packets can be matched */ if (PREDICT_FALSE (next1 == GTPU_INPUT_NEXT_L2_INPUT)) vnet_update_l2_len (b1); /* Set packet input sw_if_index to unicast GTPU tunnel for learning */ vnet_buffer (b1)->sw_if_index[VLIB_RX] = sw_if_index1; pkts_decapsulated++; stats_n_packets += 1; stats_n_bytes += len1; /* Batch stats increment on the same gtpu tunnel so counter is not incremented per packet */ if (PREDICT_FALSE (sw_if_index1 != stats_sw_if_index)) { stats_n_packets -= 1; stats_n_bytes -= len1; if (stats_n_packets) vlib_increment_combined_counter ( im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX, thread_index, stats_sw_if_index, stats_n_packets, stats_n_bytes); stats_n_packets = 1; stats_n_bytes = len1; stats_sw_if_index = sw_if_index1; } trace1: b1->error = error1 ? node->errors[error1] : 0; if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED)) { gtpu_rx_trace_t *tr = vlib_add_trace (vm, node, b1, sizeof (*tr)); tr->next_index = next1; tr->error = error1; tr->tunnel_index = tunnel_index1; tr->teid = has_space1 ? clib_net_to_host_u32(gtpu1->teid) : ~0; if (vlib_buffer_has_space (b1, 4)) { tr->header.ver_flags = gtpu1->ver_flags; tr->header.type = gtpu1->type; tr->header.length = clib_net_to_host_u16 (gtpu1->length); } } vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next, n_left_to_next, bi0, bi1, next0, next1); } while (n_left_from > 0 && n_left_to_next > 0) { u32 bi0; vlib_buffer_t * b0; u32 next0; gtpu_header_t * gtpu0; u32 gtpu_hdr_len0; u32 error0; u32 tunnel_index0; gtpu_tunnel_t * t0; u32 sw_if_index0, len0; u8 has_space0 = 0; u8 ver0; gtpu_ext_header_t ext = { .type = 0, .len = 0, .pad = 0 }; gtpu_ext_header_t *ext0; bool is_fast_track0; ext0 = &ext; 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); len0 = vlib_buffer_length_in_chain (vm, b0); tunnel_index0 = ~0; error0 = 0; ip_err0 = gtpu_check_ip (b0, len0); udp_err0 = gtpu_check_ip_udp_len (b0); if (PREDICT_FALSE (gtpu_local_need_csum_check (b0))) csum_err0 = !gtpu_validate_udp_csum (vm, b0); else csum_err0 = !gtpu_local_csum_is_valid (b0); /* udp leaves current_data pointing at the gtpu header */ gtpu0 = vlib_buffer_get_current (b0); /* speculatively load gtp header version field */ ver0 = gtpu0->ver_flags; /* * Manipulate gtpu header * TBD: Manipulate Sequence Number and N-PDU Number * TBD: Manipulate Next Extension Header */ is_fast_track0 = ((ver0 & (GTPU_VER_MASK | GTPU_PT_BIT | GTPU_RES_BIT)) == (GTPU_V1_VER | GTPU_PT_BIT)); is_fast_track0 = is_fast_track0 & (gtpu0->type == 255); ext0 = (ver0 & GTPU_E_BIT) ? (gtpu_ext_header_t *) >pu0->next_ext_type : &ext; gtpu_hdr_len0 = sizeof (gtpu_header_t) - (((ver0 & GTPU_E_S_PN_BIT) == 0) * 4) + ext0->len * 4; ext0 += ext0->len * 4 / sizeof (*ext0); has_space0 = vlib_buffer_has_space (b0, gtpu_hdr_len0); if (ip_err0 || udp_err0 || csum_err0) { next0 = GTPU_INPUT_NEXT_DROP; error0 = gtpu_err_code (ip_err0, udp_err0, csum_err0); goto trace00; } if (PREDICT_FALSE ((!is_fast_track0) | (!has_space0))) { /* Not fast path. ext0 and gtpu_hdr_len0 might be wrong */ /* GCC will hopefully fix the duplicate compute */ if (PREDICT_FALSE ( !((ver0 & (GTPU_VER_MASK | GTPU_PT_BIT | GTPU_RES_BIT)) == (GTPU_V1_VER | GTPU_PT_BIT)) | (!has_space0))) { /* The header or size is wrong */ error0 = has_space0 ? GTPU_ERROR_BAD_VER : GTPU_ERROR_TOO_SMALL; next0 = GTPU_INPUT_NEXT_DROP; goto trace00; } /* Correct version and has the space. It can only be unknown * message type. */ error0 = GTPU_ERROR_UNSUPPORTED_TYPE; next0 = GTPU_INPUT_NEXT_DROP; /* The packet is not forwarded */ goto trace00; } ASSERT (b0->flow_id != 0); tunnel_index0 = b0->flow_id - gtm->flow_id_start; t0 = pool_elt_at_index (gtm->tunnels, tunnel_index0); b0->flow_id = 0; /* Pop gtpu header */ vlib_buffer_advance (b0, gtpu_hdr_len0); /* assign the next node */ if (PREDICT_FALSE (t0->decap_next_index != GTPU_INPUT_NEXT_IP4_INPUT) && (t0->decap_next_index != GTPU_INPUT_NEXT_IP6_INPUT)) { error0 = GTPU_FLOW_ERROR_PAYLOAD_ERROR; next0 = GTPU_INPUT_NEXT_DROP; goto trace00; } next0 = t0->decap_next_index; sw_if_index0 = t0->sw_if_index; /* Set packet input sw_if_index to unicast GTPU tunnel for learning */ vnet_buffer (b0)->sw_if_index[VLIB_RX] = sw_if_index0; pkts_decapsulated++; stats_n_packets += 1; stats_n_bytes += len0; /* Batch stats increment on the same gtpu tunnel so counter is not incremented per packet */ if (PREDICT_FALSE (sw_if_index0 != stats_sw_if_index)) { stats_n_packets -= 1; stats_n_bytes -= len0; if (stats_n_packets) vlib_increment_combined_counter ( im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX, thread_index, stats_sw_if_index, stats_n_packets, stats_n_bytes); stats_n_packets = 1; stats_n_bytes = len0; stats_sw_if_index = sw_if_index0; } trace00: b0->error = error0 ? node->errors[error0] : 0; if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) { gtpu_rx_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof (*tr)); tr->next_index = next0; tr->error = error0; tr->tunnel_index = tunnel_index0; tr->teid = has_space0 ? clib_net_to_host_u32(gtpu0->teid) : ~0; if (vlib_buffer_has_space (b0, 4)) { tr->header.ver_flags = gtpu0->ver_flags; tr->header.type = gtpu0->type; tr->header.length = clib_net_to_host_u16 (gtpu0->length); } } 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); } /* Do we still need this now that tunnel tx stats is kept? */ vlib_node_increment_counter (vm, gtpu4_flow_input_node.index, GTPU_ERROR_DECAPSULATED, pkts_decapsulated); /* Increment any remaining batch stats */ if (stats_n_packets) { vlib_increment_combined_counter (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX, thread_index, stats_sw_if_index, stats_n_packets, stats_n_bytes); node->runtime_data[0] = stats_sw_if_index; } return from_frame->n_vectors; } VLIB_NODE_FN (gtpu4_flow_input_node) (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame) { return gtpu_flow_input(vm, node, from_frame); } #ifndef CLIB_MULTIARCH_VARIANT VLIB_REGISTER_NODE (gtpu4_flow_input_node) = { .name = "gtpu4-flow-input", .type = VLIB_NODE_TYPE_INTERNAL, .vector_size = sizeof (u32), .format_trace = format_gtpu_rx_trace, .n_errors = GTPU_FLOW_N_ERROR, .error_strings = gtpu_flow_error_strings, .n_next_nodes = GTPU_INPUT_N_NEXT, .next_nodes = { #define _(s,n) [GTPU_INPUT_NEXT_##s] = n, foreach_gtpu_input_next #undef _ }, }; #endif #endif /* CLIB_MARCH_VARIANT */