/* * 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 LISP-GPE decap code. * */ #include #include #include typedef struct { u32 next_index; u32 tunnel_index; u32 error; lisp_gpe_header_t h; } lisp_gpe_rx_trace_t; static u8 * format_lisp_gpe_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 *); lisp_gpe_rx_trace_t *t = va_arg (*args, lisp_gpe_rx_trace_t *); if (t->tunnel_index != ~0) { s = format (s, "LISP-GPE: tunnel %d next %d error %d", t->tunnel_index, t->next_index, t->error); } else { s = format (s, "LISP-GPE: no tunnel next %d error %d\n", t->next_index, t->error); } s = format (s, "\n %U", format_lisp_gpe_header_with_length, &t->h, (u32) sizeof (t->h) /* max size */ ); return s; } static u32 next_proto_to_next_index[LISP_GPE_NEXT_PROTOS] = { LISP_GPE_INPUT_NEXT_DROP, LISP_GPE_INPUT_NEXT_IP4_INPUT, LISP_GPE_INPUT_NEXT_IP6_INPUT, LISP_GPE_INPUT_NEXT_L2_INPUT, LISP_GPE_INPUT_NEXT_DROP }; always_inline u32 next_protocol_to_next_index (lisp_gpe_header_t * lgh, u8 * next_header) { lisp_gpe_main_t *lgm = vnet_lisp_gpe_get_main (); /* lisp-gpe router */ if (PREDICT_TRUE ((lgh->flags & LISP_GPE_FLAGS_P) || GPE_ENCAP_VXLAN == lgm->encap_mode)) { if (PREDICT_FALSE (lgh->next_protocol >= LISP_GPE_NEXT_PROTOS)) return LISP_GPE_INPUT_NEXT_DROP; return next_proto_to_next_index[lgh->next_protocol]; } /* legacy lisp router */ else if ((lgh->flags & LISP_GPE_FLAGS_P) == 0) { ip4_header_t *iph = (ip4_header_t *) next_header; if ((iph->ip_version_and_header_length & 0xF0) == 0x40) return LISP_GPE_INPUT_NEXT_IP4_INPUT; else if ((iph->ip_version_and_header_length & 0xF0) == 0x60) return LISP_GPE_INPUT_NEXT_IP6_INPUT; else return LISP_GPE_INPUT_NEXT_DROP; } else return LISP_GPE_INPUT_NEXT_DROP; } always_inline tunnel_lookup_t * next_index_to_iface (lisp_gpe_main_t * lgm, u32 next_index) { if (LISP_GPE_INPUT_NEXT_IP4_INPUT == next_index || LISP_GPE_INPUT_NEXT_IP6_INPUT == next_index) return &lgm->l3_ifaces; else if (LISP_GPE_INPUT_NEXT_L2_INPUT == next_index) return &lgm->l2_ifaces; else if (LISP_GPE_INPUT_NEXT_NSH_INPUT == next_index) return &lgm->nsh_ifaces; clib_warning ("next_index not associated to an interface!"); return 0; } static_always_inline void incr_decap_stats (vnet_main_t * vnm, u32 thread_index, u32 length, u32 sw_if_index, u32 * last_sw_if_index, u32 * n_packets, u32 * n_bytes) { vnet_interface_main_t *im; if (PREDICT_TRUE (sw_if_index == *last_sw_if_index)) { *n_packets += 1; *n_bytes += length; } else { if (PREDICT_TRUE (*last_sw_if_index != ~0)) { im = &vnm->interface_main; vlib_increment_combined_counter (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX, thread_index, *last_sw_if_index, *n_packets, *n_bytes); } *last_sw_if_index = sw_if_index; *n_packets = 1; *n_bytes = length; } } /** * @brief LISP-GPE decap dispatcher. * @node lisp_gpe_input_inline * * LISP-GPE decap dispatcher. * * Decaps IP-UDP-LISP-GPE header and based on the next protocol and in the * GPE header and the vni decides the next node to forward the packet to. * * @param[in] vm vlib_main_t corresponding to current thread. * @param[in] node vlib_node_runtime_t data for this node. * @param[in] frame vlib_frame_t whose contents should be dispatched. * * @return number of vectors in frame. */ static uword lisp_gpe_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame, u8 is_v4) { u32 n_left_from, next_index, *from, *to_next, thread_index; u32 n_bytes = 0, n_packets = 0, last_sw_if_index = ~0, drops = 0; lisp_gpe_main_t *lgm = vnet_lisp_gpe_get_main (); thread_index = vlib_get_thread_index (); 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; ip4_udp_lisp_gpe_header_t *iul4_0, *iul4_1; ip6_udp_lisp_gpe_header_t *iul6_0, *iul6_1; lisp_gpe_header_t *lh0, *lh1; u32 next0, next1, error0, error1; uword *si0, *si1; tunnel_lookup_t *tl0, *tl1; /* 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 lisp header */ if (is_v4) { vlib_buffer_advance (b0, -(word) (sizeof (udp_header_t) + sizeof (ip4_header_t))); vlib_buffer_advance (b1, -(word) (sizeof (udp_header_t) + sizeof (ip4_header_t))); iul4_0 = vlib_buffer_get_current (b0); iul4_1 = vlib_buffer_get_current (b1); /* pop (ip, udp, lisp-gpe) */ vlib_buffer_advance (b0, sizeof (*iul4_0)); vlib_buffer_advance (b1, sizeof (*iul4_1)); lh0 = &iul4_0->lisp; lh1 = &iul4_1->lisp; } else { vlib_buffer_advance (b0, -(word) (sizeof (udp_header_t) + sizeof (ip6_header_t))); vlib_buffer_advance (b1, -(word) (sizeof (udp_header_t) + sizeof (ip6_header_t))); iul6_0 = vlib_buffer_get_current (b0); iul6_1 = vlib_buffer_get_current (b1); /* pop (ip, udp, lisp-gpe) */ vlib_buffer_advance (b0, sizeof (*iul6_0)); vlib_buffer_advance (b1, sizeof (*iul6_1)); lh0 = &iul6_0->lisp; lh1 = &iul6_1->lisp; } /* determine next_index from lisp-gpe header */ next0 = next_protocol_to_next_index (lh0, vlib_buffer_get_current (b0)); next1 = next_protocol_to_next_index (lh1, vlib_buffer_get_current (b1)); /* determine if tunnel is l2 or l3 */ tl0 = next_index_to_iface (lgm, next0); tl1 = next_index_to_iface (lgm, next1); /* map iid/vni to lisp-gpe sw_if_index which is used by ipx_input to * decide the rx vrf and the input features to be applied */ si0 = hash_get (tl0->sw_if_index_by_vni, clib_net_to_host_u32 (lh0->iid << 8)); si1 = hash_get (tl1->sw_if_index_by_vni, clib_net_to_host_u32 (lh1->iid << 8)); /* Required to make the l2 tag push / pop code work on l2 subifs */ vnet_update_l2_len (b0); vnet_update_l2_len (b1); if (si0) { incr_decap_stats (lgm->vnet_main, thread_index, vlib_buffer_length_in_chain (vm, b0), si0[0], &last_sw_if_index, &n_packets, &n_bytes); vnet_buffer (b0)->sw_if_index[VLIB_RX] = si0[0]; error0 = 0; } else { next0 = LISP_GPE_INPUT_NEXT_DROP; error0 = LISP_GPE_ERROR_NO_TUNNEL;