/* * Copyright (c) 2016 Cisco and/or its affiliates. * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ /** * @file * @brief L2-GRE over IPSec packet processing. * * Removes GRE header from the packet and sends it to the l2-input node. */ #include <vlib/vlib.h> #include <vnet/pg/pg.h> #include <vnet/ipsec-gre/ipsec_gre.h> #include <vppinfra/sparse_vec.h> #define foreach_ipsec_gre_input_next \ _(PUNT, "error-punt") \ _(DROP, "error-drop") \ _(L2_INPUT, "l2-input") typedef enum { #define _(s,n) IPSEC_GRE_INPUT_NEXT_##s, foreach_ipsec_gre_input_next #undef _ IPSEC_GRE_INPUT_N_NEXT, } ipsec_gre_input_next_t; typedef struct { u32 tunnel_id; u32 length; ip4_address_t src; ip4_address_t dst; } ipsec_gre_rx_trace_t; u8 * format_ipsec_gre_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 *); ipsec_gre_rx_trace_t * t = va_arg (*args, ipsec_gre_rx_trace_t *); s = format (s, "GRE: tunnel %d len %d src %U dst %U", t->tunnel_id, clib_net_to_host_u16(t->length), format_ip4_address, &t->src.as_u8, format_ip4_address, &t->dst.as_u8); return s; } /** * @brief L2-GRE over IPSec input node. * @node ipsec-gre-input * * This node remove GRE header. * * @param vm vlib_main_t corresponding to the current thread. * @param node vlib_node_runtime_t data for this node. * @param from_frame vlib_frame_t whose contents should be dispatched. * * @par Graph mechanics: buffer metadata, next index usage * * <em>Uses:</em> * - <code>ip->src_address</code> and <code>ip->dst_address</code> * - Match tunnel by source and destination addresses in GRE IP header. * * <em>Sets:</em> * - <code>vnet_buffer(b)->gre.src</code> * - Save tunnel source IPv4 address. * - <code>vnet_buffer(b)->gre.dst</code> * - Save tunnel destination IPv4 address. * - <code>vnet_buffer(b)->sw_if_index[VLIB_RX]</code> * - Set input sw_if_index to IPSec-GRE tunnel for learning. * * <em>Next Index:</em> * - Dispatches the packet to the l2-input node. */ static uword ipsec_gre_input (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame) { ipsec_gre_main_t * igm = &ipsec_gre_main; u32 n_left_from, next_index, * from, * to_next; u64 cached_tunnel_key = (u64) ~0; u32 cached_tunnel_sw_if_index = 0, tunnel_sw_if_index; u32 tun_src0, tun_dst0; u32 tun_src1, tun_dst1; from = vlib_frame_vector_args (from_frame); n_left_from = 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 >= 4 && n_left_to_next >= 2) { u32 bi0, bi1; vlib_buffer_t * b0, * b1; gre_header_t * h0, * h1; u16 version0, version1, protocol0, protocol1; int verr0, verr1; u32 next0, next1; ip4_header_t *ip0, *ip1; /* 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, sizeof (h0[0]), LOAD); CLIB_PREFETCH (p3->data, sizeof (h1[0]), 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); /* ip4_local hands us the ip header, not the gre header */ ip0 = vlib_buffer_get_current (b0); ip1 = vlib_buffer_get_current (b1); /* Save src + dst ip4 address */ tun_src0 = ip0->src_address.as_u32; tun_dst0 = ip0->dst_address.as_u32; tun_src1 = ip1->src_address.as_u32; tun_dst1 = ip1->dst_address.as_u32; vlib_buffer_advance (b0, sizeof (*ip0)); vlib_buffer_advance (b1, sizeof (*ip1)); h0 = vlib_buffer_get_current (b0); h1 = vlib_buffer_get_current (b1); protocol0 = clib_net_to_host_u16 (h0->protocol); protocol1 = clib_net_to_host_u16 (h1->protocol); if (PREDICT_TRUE(protocol0 == 0x0001)) { next0 = IPSEC_GRE_INPUT_NEXT_L2_INPUT; b0->error = node->errors[IPSEC_GRE_ERROR_NONE]; } else { clib_warning("unknown GRE protocol: %d", protocol0); b0->error = node->errors[IPSEC_GRE_ERROR_UNKNOWN_PROTOCOL]; next0 = IPSEC_GRE_INPUT_NEXT_DROP; } if (PREDICT_TRUE(protocol1 == 0x0001)) { next1 = IPSEC_GRE_INPUT_NEXT_L2_INPUT; b1->error = node->errors[IPSEC_GRE_ERROR_NONE]; } else { clib_warning("unknown GRE protocol: %d", protocol1); b1->error = node->errors[IPSEC_GRE_ERROR_UNKNOWN_PROTOCOL]; next1 = IPSEC_GRE_INPUT_NEXT_DROP; } version0 = clib_net_to_host_u16 (h0->flags_and_version); verr0 = version0 & GRE_VERSION_MASK; version1 = clib_net_to_host_u16 (h1->flags_and_version); verr1 = version1 & GRE_VERSION_MASK; b0->error = verr0 ? node->errors[IPSEC_GRE_ERROR_UNSUPPORTED_VERSION] : b0->error; next0 = verr0 ? IPSEC_GRE_INPUT_NEXT_DROP : next0; b1->error = verr1 ? node->errors[IPSEC_GRE_ERROR_UNSUPPORTED_VERSION] : b1->error; next1 = verr1 ? IPSEC_GRE_INPUT_NEXT_DROP : next1; /* For L2 payload set input sw_if_index to GRE tunnel for learning */ if (PREDICT_TRUE(next0 == IPSEC_GRE_INPUT_NEXT_L2_INPUT)) { u64 key = ((u64)(tun_dst0) << 32) | (u64)(tun_src0); if (cached_tunnel_key != key) { vnet_hw_interface_t * hi; ipsec_gre_tunnel_t * t; uword * p; p = hash_get (igm->tunnel_by_key, key); if (!p) { next0 = IPSEC_GRE_INPUT_NEXT_DROP; b0->error = node->errors[IPSEC_GRE_ERROR_NO_SUCH_TUNNEL]; goto drop0; } t = pool_elt_at_index (igm->tunnels, p[0]); hi = vnet_get_hw_interface (igm->vnet_main, t->hw_if_index); tunnel_sw_if_index = hi->sw_if_index; cached_tunnel_sw_if_index = tunnel_sw_if_index; } else { tunnel_sw_if_index = cached_tunnel_sw_if_index; } vnet_buffer(b0)->sw_if_index[VLIB_RX] = tunnel_sw_if_index; } drop0: /* For L2 payload set input sw_if_index to GRE tunnel for learning */ if (PREDICT_TRUE(next1 == IPSEC_GRE_INPUT_NEXT_L2_INPUT)) { u64 key = ((u64)(tun_dst1) << 32) | (u64)(tun_src1); if (cached_tunnel_key != key) { vnet_hw_interface_t * hi; ipsec_gre_tunnel_t * t; uword * p; p = hash_get (igm->tunnel_by_key, key); if (!p) { next1 = IPSEC_GRE_INPUT_NEXT_DROP; b1->error = node->errors[IPSEC_GRE_ERROR_NO_SUCH_TUNNEL]; goto drop1; } t = pool_elt_at_index (igm->tunnels, p[0]); hi = vnet_get_hw_interface (igm->vnet_main, t->hw_if_index); tunnel_sw_if_index = hi->sw_if_index; cached_tunnel_sw_if_index = tunnel_sw_if_index; } else { tunnel_sw_if_index = cached_tunnel_sw_if_index; } vnet_buffer(b1)->sw_if_index[VLIB_RX] = tunnel_sw_if_index; } drop1: if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) { ipsec_gre_rx_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof (*tr)); tr->tunnel_id = ~0; tr->length = ip0->length; tr->src.as_u32 = ip0->src_address.as_u32; tr->dst.as_u32 = ip0->dst_address.as_u32; } if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED)) { ipsec_gre_rx_trace_t *tr = vlib_add_trace (vm, node, b1, sizeof (*tr)); tr->tunnel_id = ~0; tr->length = ip1->length; tr->src.as_u32 = ip1->src_address.as_u32; tr->dst.as_u32 = ip1->dst_address.as_u32; } vlib_buffer_advance (b0, sizeof (*h0)); vlib_buffer_advance (b1, sizeof (*h1)); 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; gre_header_t * h0; ip4_header_t * ip0; u16 version0, protocol0; int verr0; u32 next0; u32 tun_src0, tun_dst0; 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); ip0 = vlib_buffer_get_current (b0); tun_src0 = ip0->src_address.as_u32; tun_dst0 = ip0->dst_address.as_u32; vlib_buffer_advance (b0, sizeof (*ip0)); h0 = vlib_buffer_get_current (b0); protocol0 = clib_net_to_host_u16 (h0->protocol); if (PREDICT_TRUE(protocol0 == 0x0001)) { next0 = IPSEC_GRE_INPUT_NEXT_L2_INPUT; b0->error = node->errors[IPSEC_GRE_ERROR_NONE]; } else { clib_warning("unknown GRE protocol: %d", protocol0); b0->error = node->errors[IPSEC_GRE_ERROR_UNKNOWN_PROTOCOL]; next0 = IPSEC_GRE_INPUT_NEXT_DROP; } version0 = clib_net_to_host_u16 (h0->flags_and_version); verr0 = version0 & GRE_VERSION_MASK; b0->error = verr0 ? node->errors[IPSEC_GRE_ERROR_UNSUPPORTED_VERSION] : b0->error; next0 = verr0 ? IPSEC_GRE_INPUT_NEXT_DROP : next0; /* For L2 payload set input sw_if_index to GRE tunnel for learning */ if (PREDICT_FALSE(next0 == IPSEC_GRE_INPUT_NEXT_L2_INPUT)) { u64 key = ((u64)(tun_dst0) << 32) | (u64)(tun_src0); if (cached_tunnel_key != key) { vnet_hw_interface_t * hi; ipsec_gre_tunnel_t * t; uword * p; p = hash_get (igm->tunnel_by_key, key); if (!p) { next0 = IPSEC_GRE_INPUT_NEXT_DROP; b0->error = node->errors[IPSEC_GRE_ERROR_NO_SUCH_TUNNEL]; goto drop; } t = pool_elt_at_index (igm->tunnels, p[0]); hi = vnet_get_hw_interface (igm->vnet_main, t->hw_if_index); tunnel_sw_if_index = hi->sw_if_index; cached_tunnel_sw_if_index = tunnel_sw_if_index; } else { tunnel_sw_if_index = cached_tunnel_sw_if_index; } vnet_buffer(b0)->sw_if_index[VLIB_RX] = tunnel_sw_if_index; } drop: if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) { ipsec_gre_rx_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof (*tr)); tr->tunnel_id = ~0; tr->length = ip0->length; tr->src.as_u32 = ip0->src_address.as_u32; tr->dst.as_u32 = ip0->dst_address.as_u32; } vlib_buffer_advance (b0, sizeof (*h0)); vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, n_left_to_next, bi0, next0); } vlib_put_next_frame (vm, node, next_index, n_left_to_next); } vlib_node_increment_counter (vm, ipsec_gre_input_node.index, IPSEC_GRE_ERROR_PKTS_DECAP, from_frame->n_vectors); return from_frame->n_vectors; } static char * ipsec_gre_error_strings[] = { #define ipsec_gre_error(n,s) s, #include "error.def" #undef ipsec_gre_error }; VLIB_REGISTER_NODE (ipsec_gre_input_node) = { .function = ipsec_gre_input, .name = "ipsec-gre-input", /* Takes a vector of packets. */ .vector_size = sizeof (u32), .n_errors = IPSEC_GRE_N_ERROR, .error_strings = ipsec_gre_error_strings, .n_next_nodes = IPSEC_GRE_INPUT_N_NEXT, .next_nodes = { #define _(s,n) [IPSEC_GRE_INPUT_NEXT_##s] = n, foreach_ipsec_gre_input_next #undef _ }, .format_trace = format_ipsec_gre_rx_trace, }; VLIB_NODE_FUNCTION_MULTIARCH (ipsec_gre_input_node, ipsec_gre_input) static clib_error_t * ipsec_gre_input_init (vlib_main_t * vm) { { clib_error_t * error; error = vlib_call_init_function (vm, ipsec_gre_init); if (error) clib_error_report (error); } return 0; } VLIB_INIT_FUNCTION (ipsec_gre_input_init);