From 7cd468a3d7dee7d6c92f69a0bb7061ae208ec727 Mon Sep 17 00:00:00 2001 From: Damjan Marion Date: Mon, 19 Dec 2016 23:05:39 +0100 Subject: Reorganize source tree to use single autotools instance Change-Id: I7b51f88292e057c6443b12224486f2d0c9f8ae23 Signed-off-by: Damjan Marion --- src/vnet/lisp-gpe/decap.c | 501 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 501 insertions(+) create mode 100644 src/vnet/lisp-gpe/decap.c (limited to 'src/vnet/lisp-gpe/decap.c') diff --git a/src/vnet/lisp-gpe/decap.c b/src/vnet/lisp-gpe/decap.c new file mode 100644 index 00000000000..637d4a740c8 --- /dev/null +++ b/src/vnet/lisp-gpe/decap.c @@ -0,0 +1,501 @@ +/* + * 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 router */ + if (PREDICT_TRUE ((lgh->flags & LISP_GPE_FLAGS_P) + && lgh->next_protocol < LISP_GPE_NEXT_PROTOS)) + 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; + clib_warning ("next_index not associated to an interface!"); + return 0; +} + +static_always_inline void +incr_decap_stats (vnet_main_t * vnm, u32 cpu_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, + cpu_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, cpu_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 (); + + cpu_index = os_get_cpu_number (); + 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)); + si1 = hash_get (tl1->sw_if_index_by_vni, + clib_net_to_host_u32 (lh1->iid)); + + + /* 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, cpu_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; + drops++; + } + + if (si1) + { + incr_decap_stats (lgm->vnet_main, cpu_index, + vlib_buffer_length_in_chain (vm, b1), si1[0], + &last_sw_if_index, &n_packets, &n_bytes); + vnet_buffer (b1)->sw_if_index[VLIB_RX] = si1[0]; + error1 = 0; + } + else + { + next1 = LISP_GPE_INPUT_NEXT_DROP; + error1 = LISP_GPE_ERROR_NO_TUNNEL; + drops++; + } + + b0->error = error0 ? node->errors[error0] : 0; + b1->error = error1 ? node->errors[error1] : 0; + + if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) + { + lisp_gpe_rx_trace_t *tr = vlib_add_trace (vm, node, b0, + sizeof (*tr)); + tr->next_index = next0; + tr->error = error0; + tr->h = lh0[0]; + } + + if (PREDICT_FALSE (b1->flags & VLIB_BUFFER_IS_TRACED)) + { + lisp_gpe_rx_trace_t *tr = vlib_add_trace (vm, node, b1, + sizeof (*tr)); + tr->next_index = next1; + tr->error = error1; + tr->h = lh1[0]; + } + + 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; + ip4_udp_lisp_gpe_header_t *iul4_0; + ip6_udp_lisp_gpe_header_t *iul6_0; + lisp_gpe_header_t *lh0; + u32 error0; + uword *si0; + tunnel_lookup_t *tl0; + + 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 lisp header + * TODO: there's no difference in processing between v4 and v6 + * encapsulated packets so the code should be simplified if ip header + * info is not going to be used for dp smrs/dpsec */ + if (is_v4) + { + vlib_buffer_advance (b0, + -(word) (sizeof (udp_header_t) + + sizeof (ip4_header_t))); + + iul4_0 = vlib_buffer_get_current (b0); + + /* pop (ip, udp, lisp-gpe) */ + vlib_buffer_advance (b0, sizeof (*iul4_0)); + + lh0 = &iul4_0->lisp; + } + else + { + vlib_buffer_advance (b0, + -(word) (sizeof (udp_header_t) + + sizeof (ip6_header_t))); + + iul6_0 = vlib_buffer_get_current (b0); + + /* pop (ip, udp, lisp-gpe) */ + vlib_buffer_advance (b0, sizeof (*iul6_0)); + + lh0 = &iul6_0->lisp; + } + + /* TODO if security is to be implemented, something similar to RPF, + * probably we'd like to check that the peer is allowed to send us + * packets. For this, we should use the tunnel table OR check that + * we have a mapping for the source eid and that the outer source of + * the packet is one of its locators */ + + /* determine next_index from lisp-gpe header */ + next0 = next_protocol_to_next_index (lh0, + vlib_buffer_get_current (b0)); + + /* determine if tunnel is l2 or l3 */ + tl0 = next_index_to_iface (lgm, next0); + + /* 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. + * NOTE: vni uses only the first 24 bits */ + si0 = hash_get (tl0->sw_if_index_by_vni, + clib_net_to_host_u32 (lh0->iid << 8)); + + /* Required to make the l2 tag push / pop code work on l2 subifs */ + vnet_update_l2_len (b0); + + if (si0) + { + incr_decap_stats (lgm->vnet_main, cpu_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; + drops++; + } + + /* TODO error handling if security is implemented */ + b0->error = error0 ? node->errors[error0] : 0; + + if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) + { + lisp_gpe_rx_trace_t *tr = vlib_add_trace (vm, node, b0, + sizeof (*tr)); + tr->next_index = next0; + tr->error = error0; + tr->h = lh0[0]; + } + + 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); + } + + /* flush iface stats */ + incr_decap_stats (lgm->vnet_main, cpu_index, 0, ~0, &last_sw_if_index, + &n_packets, &n_bytes); + vlib_node_increment_counter (vm, lisp_gpe_ip4_input_node.index, + LISP_GPE_ERROR_NO_TUNNEL, drops); + return from_frame->n_vectors; +} + +static uword +lisp_gpe_ip4_input (vlib_main_t * vm, vlib_node_runtime_t * node, + vlib_frame_t * from_frame) +{ + return lisp_gpe_input_inline (vm, node, from_frame, 1); +} + +static uword +lisp_gpe_ip6_input (vlib_main_t * vm, vlib_node_runtime_t * node, + vlib_frame_t * from_frame) +{ + return lisp_gpe_input_inline (vm, node, from_frame, 0); +} + +static char *lisp_gpe_ip4_input_error_strings[] = { +#define lisp_gpe_error(n,s) s, +#include +#undef lisp_gpe_error +}; + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (lisp_gpe_ip4_input_node) = { + .function = lisp_gpe_ip4_input, + .name = "lisp-gpe-ip4-input", + /* Takes a vector of packets. */ + .vector_size = sizeof (u32), + .n_next_nodes = LISP_GPE_INPUT_N_NEXT, + .next_nodes = { +#define _(s,n) [LISP_GPE_INPUT_NEXT_##s] = n, + foreach_lisp_gpe_ip_input_next +#undef _ + }, + + .n_errors = ARRAY_LEN (lisp_gpe_ip4_input_error_strings), + .error_strings = lisp_gpe_ip4_input_error_strings, + + .format_buffer = format_lisp_gpe_header_with_length, + .format_trace = format_lisp_gpe_rx_trace, + // $$$$ .unformat_buffer = unformat_lisp_gpe_header, +}; +/* *INDENT-ON* */ + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (lisp_gpe_ip6_input_node) = { + .function = lisp_gpe_ip6_input, + .name = "lisp-gpe-ip6-input", + /* Takes a vector of packets. */ + .vector_size = sizeof (u32), + .n_next_nodes = LISP_GPE_INPUT_N_NEXT, + .next_nodes = { +#define _(s,n) [LISP_GPE_INPUT_NEXT_##s] = n, + foreach_lisp_gpe_ip_input_next +#undef _ + }, + + .n_errors = ARRAY_LEN (lisp_gpe_ip4_input_error_strings), + .error_strings = lisp_gpe_ip4_input_error_strings, + + .format_buffer = format_lisp_gpe_header_with_length, + .format_trace = format_lisp_gpe_rx_trace, + // $$$$ .unformat_buffer = unformat_lisp_gpe_header, +}; +/* *INDENT-ON* */ + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ -- cgit 1.2.3-korg