diff options
Diffstat (limited to 'src/plugins/gre')
| -rw-r--r-- | src/plugins/gre/CMakeLists.txt | 35 | ||||
| -rw-r--r-- | src/plugins/gre/FEATURE.yaml | 13 | ||||
| -rw-r--r-- | src/plugins/gre/error.def | 23 | ||||
| -rw-r--r-- | src/plugins/gre/gre.api | 110 | ||||
| -rw-r--r-- | src/plugins/gre/gre.c | 846 | ||||
| -rw-r--r-- | src/plugins/gre/gre.h | 443 | ||||
| -rw-r--r-- | src/plugins/gre/gre_api.c | 218 | ||||
| -rw-r--r-- | src/plugins/gre/interface.c | 832 | ||||
| -rw-r--r-- | src/plugins/gre/node.c | 576 | ||||
| -rw-r--r-- | src/plugins/gre/pg.c | 84 | ||||
| -rw-r--r-- | src/plugins/gre/plugin.c | 26 |
11 files changed, 3206 insertions, 0 deletions
diff --git a/src/plugins/gre/CMakeLists.txt b/src/plugins/gre/CMakeLists.txt new file mode 100644 index 00000000000..60fe540b968 --- /dev/null +++ b/src/plugins/gre/CMakeLists.txt @@ -0,0 +1,35 @@ +# Copyright (c) 2023 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. + +add_vpp_plugin(gre + SOURCES + gre.c + node.c + gre_api.c + interface.c + pg.c + plugin.c + + MULTIARCH_SOURCES + node.c + gre.c + + INSTALL_HEADERS + gre.h + error.def + + API_FILES + gre.api + +) + diff --git a/src/plugins/gre/FEATURE.yaml b/src/plugins/gre/FEATURE.yaml new file mode 100644 index 00000000000..4b35b870dc3 --- /dev/null +++ b/src/plugins/gre/FEATURE.yaml @@ -0,0 +1,13 @@ +--- +name: Generic Routing Encapsulation +maintainer: Neale Ranns <nranns@cisco.com> +features: + - L3 tunnels, all combinations of IPv4 and IPv6 + - Encap/Decap flags to control the copying of DSCP, ECN, DF from overlay to + underlay and vice-versa. + - L2 tunnels +missing: + - GRE keys +description: "An implementation of Generic Routing Encapsulation (GRE)" +state: production +properties: [API, CLI, MULTITHREAD] diff --git a/src/plugins/gre/error.def b/src/plugins/gre/error.def new file mode 100644 index 00000000000..161ecc1d874 --- /dev/null +++ b/src/plugins/gre/error.def @@ -0,0 +1,23 @@ +/* + * gre_error.def: gre errors + * + * Copyright (c) 2012 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. + */ + +gre_error (NONE, "no error") +gre_error (UNKNOWN_PROTOCOL, "unknown protocol") +gre_error (UNSUPPORTED_VERSION, "unsupported version") +gre_error (PKTS_DECAP, "GRE input packets decapsulated") +gre_error (PKTS_ENCAP, "GRE output packets encapsulated") +gre_error (NO_SUCH_TUNNEL, "GRE input packets dropped due to missing tunnel") diff --git a/src/plugins/gre/gre.api b/src/plugins/gre/gre.api new file mode 100644 index 00000000000..9c69ba4007d --- /dev/null +++ b/src/plugins/gre/gre.api @@ -0,0 +1,110 @@ +/* Hey Emacs use -*- mode: C -*- */ +/* + * Copyright (c) 2015-2020 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. + */ + +option version = "2.1.1"; + +import "vnet/interface_types.api"; +import "vnet/tunnel/tunnel_types.api"; +import "vnet/ip/ip_types.api"; + +/** \brief A GRE tunnel type +*/ +enum gre_tunnel_type : u8 +{ + GRE_API_TUNNEL_TYPE_L3 = 0, + /* L2 Transparent Ethernet Bridge */ + GRE_API_TUNNEL_TYPE_TEB, + /* Encapsulated Remote Switched Port ANalyzer */ + GRE_API_TUNNEL_TYPE_ERSPAN, +}; + +/** \brief A composite type uniquely defining a GRE tunnel. + @param type - tunnel type (see enum definition), 0: L3, 1: TEB, 2: ERSPAN + @param mode - P2P or P2MP + @param flags - to control encap/decap behaviour + @param session_id - session for ERSPAN tunnel, range 0-1023 + @param instance - optional unique custom device instance, else ~0. + @param outer_table_id - Encap FIB table ID + @param sw_if_index - ignored on create/delete, present in details. + @param src - Source IP address + @param dst - Destination IP address, can be multicast +*/ +typedef gre_tunnel +{ + vl_api_gre_tunnel_type_t type; + vl_api_tunnel_mode_t mode; + vl_api_tunnel_encap_decap_flags_t flags; + u16 session_id; + u32 instance; + u32 outer_table_id; + vl_api_interface_index_t sw_if_index; + vl_api_address_t src; + vl_api_address_t dst; +}; + +/** \brief Add or delete a single GRE tunnel. + @param client_index - opaque cookie to identify the sender. + @param context - sender context, to match reply w/ request. + @param is_add - add if true, delete if false. + @param tunnel - tunnel definition to add or delete. +*/ +define gre_tunnel_add_del +{ + u32 client_index; + u32 context; + bool is_add; + vl_api_gre_tunnel_t tunnel; +}; + +/** \brief Add or delete a single GRE tunnel. + @param context - sender context, to match reply w/ request. + @param retval - return code for the request. + @param sw_if_index - the interface corresponding to the affected tunnel. +*/ +define gre_tunnel_add_del_reply +{ + u32 context; + i32 retval; + vl_api_interface_index_t sw_if_index; +}; + +/** \brief Dump details of all or just a single GRE tunnel. + @param client_index - opaque cookie to identify the sender. + @param context - sender context, to match reply w/ request. + @param sw_if_index - filter for tunnel of this interface index, ~0 for all. +*/ +define gre_tunnel_dump +{ + u32 client_index; + u32 context; + vl_api_interface_index_t sw_if_index; +}; + +/** \brief Details response for one of the requested GRE tunnels. + @param context - sender context, to match reply w/ request. + @param tunnel - definition of the dumped tunnel. +*/ +define gre_tunnel_details +{ + u32 context; + vl_api_gre_tunnel_t tunnel; +}; + +/* + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ diff --git a/src/plugins/gre/gre.c b/src/plugins/gre/gre.c new file mode 100644 index 00000000000..a15717475f8 --- /dev/null +++ b/src/plugins/gre/gre.c @@ -0,0 +1,846 @@ +/* + * gre.c: gre + * + * Copyright (c) 2012 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. + */ + +#include <vnet/vnet.h> +#include <gre/gre.h> +#include <vnet/adj/adj_midchain.h> +#include <vnet/tunnel/tunnel_dp.h> +#include <vpp/app/version.h> +#include <vnet/plugin/plugin.h> + +extern gre_main_t gre_main; + +#ifndef CLIB_MARCH_VARIANT +gre_main_t gre_main; + +typedef struct +{ + union + { + ip4_and_gre_header_t ip4_and_gre; + u64 as_u64[3]; + }; +} ip4_and_gre_union_t; + +typedef struct +{ + union + { + ip6_and_gre_header_t ip6_and_gre; + u64 as_u64[3]; + }; +} ip6_and_gre_union_t; +#endif /* CLIB_MARCH_VARIANT */ + +/* Packet trace structure */ +typedef struct +{ + /* Tunnel-id / index in tunnel vector */ + u32 tunnel_id; + + /* pkt length */ + u32 length; + + /* tunnel ip addresses */ + ip46_address_t src; + ip46_address_t dst; +} gre_tx_trace_t; + +extern u8 *format_gre_tx_trace (u8 *s, va_list *args); + +#ifndef CLIB_MARCH_VARIANT +u8 * +format_gre_tx_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 *); + gre_tx_trace_t *t = va_arg (*args, gre_tx_trace_t *); + + s = format (s, "GRE: tunnel %d len %d src %U dst %U", t->tunnel_id, + t->length, format_ip46_address, &t->src, IP46_TYPE_ANY, + format_ip46_address, &t->dst, IP46_TYPE_ANY); + return s; +} + +u8 * +format_gre_protocol (u8 *s, va_list *args) +{ + gre_protocol_t p = va_arg (*args, u32); + gre_main_t *gm = &gre_main; + gre_protocol_info_t *pi = gre_get_protocol_info (gm, p); + + if (pi) + s = format (s, "%s", pi->name); + else + s = format (s, "0x%04x", p); + + return s; +} + +u8 * +format_gre_header_with_length (u8 *s, va_list *args) +{ + gre_main_t *gm = &gre_main; + gre_header_t *h = va_arg (*args, gre_header_t *); + u32 max_header_bytes = va_arg (*args, u32); + gre_protocol_t p = clib_net_to_host_u16 (h->protocol); + u32 indent, header_bytes; + + header_bytes = sizeof (h[0]); + if (max_header_bytes != 0 && header_bytes > max_header_bytes) + return format (s, "gre header truncated"); + + indent = format_get_indent (s); + + s = format (s, "GRE %U", format_gre_protocol, p); + + if (max_header_bytes != 0 && header_bytes < max_header_bytes) + { + gre_protocol_info_t *pi = gre_get_protocol_info (gm, p); + vlib_node_t *node = vlib_get_node (gm->vlib_main, pi->node_index); + if (node->format_buffer) + s = + format (s, "\n%U%U", format_white_space, indent, node->format_buffer, + (void *) (h + 1), max_header_bytes - header_bytes); + } + + return s; +} + +u8 * +format_gre_header (u8 *s, va_list *args) +{ + gre_header_t *h = va_arg (*args, gre_header_t *); + return format (s, "%U", format_gre_header_with_length, h, 0); +} + +/* Returns gre protocol as an int in host byte order. */ +uword +unformat_gre_protocol_host_byte_order (unformat_input_t *input, va_list *args) +{ + u16 *result = va_arg (*args, u16 *); + gre_main_t *gm = &gre_main; + int i; + + /* Named type. */ + if (unformat_user (input, unformat_vlib_number_by_name, + gm->protocol_info_by_name, &i)) + { + gre_protocol_info_t *pi = vec_elt_at_index (gm->protocol_infos, i); + *result = pi->protocol; + return 1; + } + + return 0; +} + +uword +unformat_gre_protocol_net_byte_order (unformat_input_t *input, va_list *args) +{ + u16 *result = va_arg (*args, u16 *); + if (!unformat_user (input, unformat_gre_protocol_host_byte_order, result)) + return 0; + *result = clib_host_to_net_u16 ((u16) *result); + return 1; +} + +uword +unformat_gre_header (unformat_input_t *input, va_list *args) +{ + u8 **result = va_arg (*args, u8 **); + gre_header_t _h, *h = &_h; + u16 p; + + if (!unformat (input, "%U", unformat_gre_protocol_host_byte_order, &p)) + return 0; + + h->protocol = clib_host_to_net_u16 (p); + + /* Add header to result. */ + { + void *p; + u32 n_bytes = sizeof (h[0]); + + vec_add2 (*result, p, n_bytes); + clib_memcpy (p, h, n_bytes); + } + + return 1; +} + +static int +gre_proto_from_vnet_link (vnet_link_t link) +{ + switch (link) + { + case VNET_LINK_IP4: + return (GRE_PROTOCOL_ip4); + case VNET_LINK_IP6: + return (GRE_PROTOCOL_ip6); + case VNET_LINK_MPLS: + return (GRE_PROTOCOL_mpls_unicast); + case VNET_LINK_ETHERNET: + return (GRE_PROTOCOL_teb); + case VNET_LINK_ARP: + return (GRE_PROTOCOL_arp); + case VNET_LINK_NSH: + ASSERT (0); + break; + } + ASSERT (0); + return (GRE_PROTOCOL_ip4); +} + +static u8 * +gre_build_rewrite (vnet_main_t *vnm, u32 sw_if_index, vnet_link_t link_type, + const void *dst_address) +{ + gre_main_t *gm = &gre_main; + const ip46_address_t *dst; + ip4_and_gre_header_t *h4; + ip6_and_gre_header_t *h6; + gre_header_t *gre; + u8 *rewrite = NULL; + gre_tunnel_t *t; + u32 ti; + u8 is_ipv6; + + dst = dst_address; + ti = gm->tunnel_index_by_sw_if_index[sw_if_index]; + + if (~0 == ti) + /* not one of ours */ + return (0); + + t = pool_elt_at_index (gm->tunnels, ti); + + is_ipv6 = t->tunnel_dst.fp_proto == FIB_PROTOCOL_IP6 ? 1 : 0; + + if (!is_ipv6) + { + vec_validate (rewrite, sizeof (*h4) - 1); + h4 = (ip4_and_gre_header_t *) rewrite; + gre = &h4->gre; + h4->ip4.ip_version_and_header_length = 0x45; + h4->ip4.ttl = 254; + h4->ip4.protocol = IP_PROTOCOL_GRE; + /* fixup ip4 header length and checksum after-the-fact */ + h4->ip4.src_address.as_u32 = t->tunnel_src.ip4.as_u32; + h4->ip4.dst_address.as_u32 = dst->ip4.as_u32; + h4->ip4.checksum = ip4_header_checksum (&h4->ip4); + } + else + { + vec_validate (rewrite, sizeof (*h6) - 1); + h6 = (ip6_and_gre_header_t *) rewrite; + gre = &h6->gre; + h6->ip6.ip_version_traffic_class_and_flow_label = + clib_host_to_net_u32 (6 << 28); + h6->ip6.hop_limit = 255; + h6->ip6.protocol = IP_PROTOCOL_GRE; + /* fixup ip6 header length and checksum after-the-fact */ + h6->ip6.src_address.as_u64[0] = t->tunnel_src.ip6.as_u64[0]; + h6->ip6.src_address.as_u64[1] = t->tunnel_src.ip6.as_u64[1]; + h6->ip6.dst_address.as_u64[0] = dst->ip6.as_u64[0]; + h6->ip6.dst_address.as_u64[1] = dst->ip6.as_u64[1]; + } + + if (PREDICT_FALSE (t->type == GRE_TUNNEL_TYPE_ERSPAN)) + { + gre->protocol = clib_host_to_net_u16 (GRE_PROTOCOL_erspan); + gre->flags_and_version = clib_host_to_net_u16 (GRE_FLAGS_SEQUENCE); + } + else + gre->protocol = + clib_host_to_net_u16 (gre_proto_from_vnet_link (link_type)); + + return (rewrite); +} + +static void +gre44_fixup (vlib_main_t *vm, const ip_adjacency_t *adj, vlib_buffer_t *b0, + const void *data) +{ + tunnel_encap_decap_flags_t flags; + ip4_and_gre_header_t *ip0; + + ip0 = vlib_buffer_get_current (b0); + flags = pointer_to_uword (data); + + /* Fixup the checksum and len fields in the GRE tunnel encap + * that was applied at the midchain node */ + ip0->ip4.length = + clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0)); + tunnel_encap_fixup_4o4 (flags, (ip4_header_t *) (ip0 + 1), &ip0->ip4); + ip0->ip4.checksum = ip4_header_checksum (&ip0->ip4); +} + +static void +gre64_fixup (vlib_main_t *vm, const ip_adjacency_t *adj, vlib_buffer_t *b0, + const void *data) +{ + tunnel_encap_decap_flags_t flags; + ip4_and_gre_header_t *ip0; + + ip0 = vlib_buffer_get_current (b0); + flags = pointer_to_uword (data); + + /* Fixup the checksum and len fields in the GRE tunnel encap + * that was applied at the midchain node */ + ip0->ip4.length = + clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0)); + tunnel_encap_fixup_6o4 (flags, (ip6_header_t *) (ip0 + 1), &ip0->ip4); + ip0->ip4.checksum = ip4_header_checksum (&ip0->ip4); +} + +static void +grex4_fixup (vlib_main_t *vm, const ip_adjacency_t *adj, vlib_buffer_t *b0, + const void *data) +{ + ip4_header_t *ip0; + + ip0 = vlib_buffer_get_current (b0); + + /* Fixup the checksum and len fields in the GRE tunnel encap + * that was applied at the midchain node */ + ip0->length = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0)); + ip0->checksum = ip4_header_checksum (ip0); +} + +static void +gre46_fixup (vlib_main_t *vm, const ip_adjacency_t *adj, vlib_buffer_t *b0, + const void *data) +{ + tunnel_encap_decap_flags_t flags; + ip6_and_gre_header_t *ip0; + + ip0 = vlib_buffer_get_current (b0); + flags = pointer_to_uword (data); + + /* Fixup the payload length field in the GRE tunnel encap that was applied + * at the midchain node */ + ip0->ip6.payload_length = clib_host_to_net_u16 ( + vlib_buffer_length_in_chain (vm, b0) - sizeof (ip0->ip6)); + tunnel_encap_fixup_4o6 (flags, b0, (ip4_header_t *) (ip0 + 1), &ip0->ip6); +} + +static void +gre66_fixup (vlib_main_t *vm, const ip_adjacency_t *adj, vlib_buffer_t *b0, + const void *data) +{ + tunnel_encap_decap_flags_t flags; + ip6_and_gre_header_t *ip0; + + ip0 = vlib_buffer_get_current (b0); + flags = pointer_to_uword (data); + + /* Fixup the payload length field in the GRE tunnel encap that was applied + * at the midchain node */ + ip0->ip6.payload_length = clib_host_to_net_u16 ( + vlib_buffer_length_in_chain (vm, b0) - sizeof (ip0->ip6)); + tunnel_encap_fixup_6o6 (flags, (ip6_header_t *) (ip0 + 1), &ip0->ip6); +} + +static void +grex6_fixup (vlib_main_t *vm, const ip_adjacency_t *adj, vlib_buffer_t *b0, + const void *data) +{ + ip6_and_gre_header_t *ip0; + + ip0 = vlib_buffer_get_current (b0); + + /* Fixup the payload length field in the GRE tunnel encap that was applied + * at the midchain node */ + ip0->ip6.payload_length = clib_host_to_net_u16 ( + vlib_buffer_length_in_chain (vm, b0) - sizeof (ip0->ip6)); +} + +/** + * return the appropriate fixup function given the overlay (link-type) and + * underlay (fproto) combination + */ +static adj_midchain_fixup_t +gre_get_fixup (fib_protocol_t fproto, vnet_link_t lt) +{ + if (fproto == FIB_PROTOCOL_IP6 && lt == VNET_LINK_IP6) + return (gre66_fixup); + if (fproto == FIB_PROTOCOL_IP6 && lt == VNET_LINK_IP4) + return (gre46_fixup); + if (fproto == FIB_PROTOCOL_IP4 && lt == VNET_LINK_IP6) + return (gre64_fixup); + if (fproto == FIB_PROTOCOL_IP4 && lt == VNET_LINK_IP4) + return (gre44_fixup); + if (fproto == FIB_PROTOCOL_IP6) + return (grex6_fixup); + if (fproto == FIB_PROTOCOL_IP4) + return (grex4_fixup); + + ASSERT (0); + return (gre44_fixup); +} + +void +gre_update_adj (vnet_main_t *vnm, u32 sw_if_index, adj_index_t ai) +{ + gre_main_t *gm = &gre_main; + gre_tunnel_t *t; + adj_flags_t af; + u32 ti; + + ti = gm->tunnel_index_by_sw_if_index[sw_if_index]; + t = pool_elt_at_index (gm->tunnels, ti); + af = ADJ_FLAG_NONE; + + /* + * the user has not requested that the load-balancing be based on + * a flow hash of the inner packet. so use the stacking to choose + * a path. + */ + if (!(t->flags & TUNNEL_ENCAP_DECAP_FLAG_ENCAP_INNER_HASH)) + af |= ADJ_FLAG_MIDCHAIN_IP_STACK; + + adj_nbr_midchain_update_rewrite ( + ai, gre_get_fixup (t->tunnel_dst.fp_proto, adj_get_link_type (ai)), + uword_to_pointer (t->flags, void *), af, + gre_build_rewrite (vnm, sw_if_index, adj_get_link_type (ai), + &t->tunnel_dst.fp_addr)); + + gre_tunnel_stack (ai); +} + +adj_walk_rc_t +mgre_mk_complete_walk (adj_index_t ai, void *data) +{ + mgre_walk_ctx_t *ctx = data; + adj_flags_t af; + + af = ADJ_FLAG_NONE; + + /* + * the user has not requested that the load-balancing be based on + * a flow hash of the inner packet. so use the stacking to choose + * a path. + */ + if (!(ctx->t->flags & TUNNEL_ENCAP_DECAP_FLAG_ENCAP_INNER_HASH)) + af |= ADJ_FLAG_MIDCHAIN_IP_STACK; + + adj_nbr_midchain_update_rewrite ( + ai, gre_get_fixup (ctx->t->tunnel_dst.fp_proto, adj_get_link_type (ai)), + uword_to_pointer (ctx->t->flags, void *), af, + gre_build_rewrite (vnet_get_main (), ctx->t->sw_if_index, + adj_get_link_type (ai), + &teib_entry_get_nh (ctx->ne)->fp_addr)); + + teib_entry_adj_stack (ctx->ne, ai); + + return (ADJ_WALK_RC_CONTINUE); +} + +adj_walk_rc_t +mgre_mk_incomplete_walk (adj_index_t ai, void *data) +{ + gre_tunnel_t *t = data; + + adj_nbr_midchain_update_rewrite ( + ai, gre_get_fixup (t->tunnel_dst.fp_proto, adj_get_link_type (ai)), NULL, + ADJ_FLAG_NONE, NULL); + + adj_midchain_delegate_unstack (ai); + + return (ADJ_WALK_RC_CONTINUE); +} + +void +mgre_update_adj (vnet_main_t *vnm, u32 sw_if_index, adj_index_t ai) +{ + gre_main_t *gm = &gre_main; + ip_adjacency_t *adj; + teib_entry_t *ne; + gre_tunnel_t *t; + u32 ti; + + adj = adj_get (ai); + ti = gm->tunnel_index_by_sw_if_index[sw_if_index]; + t = pool_elt_at_index (gm->tunnels, ti); + + ne = teib_entry_find_46 (sw_if_index, adj->ia_nh_proto, + &adj->sub_type.nbr.next_hop); + + if (NULL == ne) + { + // no TEIB entry to provide the next-hop + adj_nbr_midchain_update_rewrite ( + ai, gre_get_fixup (t->tunnel_dst.fp_proto, adj_get_link_type (ai)), + uword_to_pointer (t->flags, void *), ADJ_FLAG_NONE, NULL); + return; + } + + mgre_walk_ctx_t ctx = { .t = t, .ne = ne }; + adj_nbr_walk_nh (sw_if_index, adj->ia_nh_proto, &adj->sub_type.nbr.next_hop, + mgre_mk_complete_walk, &ctx); +} +#endif /* CLIB_MARCH_VARIANT */ + +typedef enum +{ + GRE_ENCAP_NEXT_L2_MIDCHAIN, + GRE_ENCAP_N_NEXT, +} gre_encap_next_t; + +/** + * @brief TX function. Only called for L2 payload including TEB or ERSPAN. + * L3 traffic uses the adj-midchains. + */ +static_always_inline u32 +gre_encap_inline (vlib_main_t *vm, vlib_node_runtime_t *node, + vlib_frame_t *frame, gre_tunnel_type_t type) +{ + gre_main_t *gm = &gre_main; + u32 *from, n_left_from; + vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs; + u32 sw_if_index[2] = { ~0, ~0 }; + const gre_tunnel_t *gt[2] = { 0 }; + adj_index_t adj_index[2] = { ADJ_INDEX_INVALID, ADJ_INDEX_INVALID }; + + from = vlib_frame_vector_args (frame); + n_left_from = frame->n_vectors; + vlib_get_buffers (vm, from, bufs, n_left_from); + + while (n_left_from >= 2) + { + + if (PREDICT_FALSE (sw_if_index[0] != + vnet_buffer (b[0])->sw_if_index[VLIB_TX])) + { + const vnet_hw_interface_t *hi; + sw_if_index[0] = vnet_buffer (b[0])->sw_if_index[VLIB_TX]; + hi = vnet_get_sup_hw_interface (gm->vnet_main, sw_if_index[0]); + gt[0] = &gm->tunnels[hi->dev_instance]; + adj_index[0] = gt[0]->l2_adj_index; + } + if (PREDICT_FALSE (sw_if_index[1] != + vnet_buffer (b[1])->sw_if_index[VLIB_TX])) + { + const vnet_hw_interface_t *hi; + sw_if_index[1] = vnet_buffer (b[1])->sw_if_index[VLIB_TX]; + hi = vnet_get_sup_hw_interface (gm->vnet_main, sw_if_index[1]); + gt[1] = &gm->tunnels[hi->dev_instance]; + adj_index[1] = gt[1]->l2_adj_index; + } + + vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = adj_index[0]; + vnet_buffer (b[1])->ip.adj_index[VLIB_TX] = adj_index[1]; + + if (type == GRE_TUNNEL_TYPE_ERSPAN) + { + /* Encap GRE seq# and ERSPAN type II header */ + erspan_t2_t *h0; + u32 seq_num; + u64 hdr; + vlib_buffer_advance (b[0], -sizeof (erspan_t2_t)); + h0 = vlib_buffer_get_current (b[0]); + seq_num = clib_atomic_fetch_add (>[0]->gre_sn->seq_num, 1); + hdr = clib_host_to_net_u64 (ERSPAN_HDR2); + h0->seq_num = clib_host_to_net_u32 (seq_num); + h0->t2_u64 = hdr; + h0->t2.cos_en_t_session |= clib_host_to_net_u16 (gt[0]->session_id); + } + if (type == GRE_TUNNEL_TYPE_ERSPAN) + { + /* Encap GRE seq# and ERSPAN type II header */ + erspan_t2_t *h0; + u32 seq_num; + u64 hdr; + vlib_buffer_advance (b[1], -sizeof (erspan_t2_t)); + h0 = vlib_buffer_get_current (b[1]); + seq_num = clib_atomic_fetch_add (>[1]->gre_sn->seq_num, 1); + hdr = clib_host_to_net_u64 (ERSPAN_HDR2); + h0->seq_num = clib_host_to_net_u32 (seq_num); + h0->t2_u64 = hdr; + h0->t2.cos_en_t_session |= clib_host_to_net_u16 (gt[1]->session_id); + } + + if (PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED)) + { + gre_tx_trace_t *tr = vlib_add_trace (vm, node, b[0], sizeof (*tr)); + tr->tunnel_id = gt[0] - gm->tunnels; + tr->src = gt[0]->tunnel_src; + tr->dst = gt[0]->tunnel_dst.fp_addr; + tr->length = vlib_buffer_length_in_chain (vm, b[0]); + } + if (PREDICT_FALSE (b[1]->flags & VLIB_BUFFER_IS_TRACED)) + { + gre_tx_trace_t *tr = vlib_add_trace (vm, node, b[1], sizeof (*tr)); + tr->tunnel_id = gt[1] - gm->tunnels; + tr->src = gt[1]->tunnel_src; + tr->dst = gt[1]->tunnel_dst.fp_addr; + tr->length = vlib_buffer_length_in_chain (vm, b[1]); + } + + b += 2; + n_left_from -= 2; + } + + while (n_left_from >= 1) + { + + if (PREDICT_FALSE (sw_if_index[0] != + vnet_buffer (b[0])->sw_if_index[VLIB_TX])) + { + const vnet_hw_interface_t *hi; + sw_if_index[0] = vnet_buffer (b[0])->sw_if_index[VLIB_TX]; + hi = vnet_get_sup_hw_interface (gm->vnet_main, sw_if_index[0]); + gt[0] = &gm->tunnels[hi->dev_instance]; + adj_index[0] = gt[0]->l2_adj_index; + } + + vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = adj_index[0]; + + if (type == GRE_TUNNEL_TYPE_ERSPAN) + { + /* Encap GRE seq# and ERSPAN type II header */ + erspan_t2_t *h0; + u32 seq_num; + u64 hdr; + ASSERT (gt[0]->type == GRE_TUNNEL_TYPE_ERSPAN); + vlib_buffer_advance (b[0], -sizeof (erspan_t2_t)); + h0 = vlib_buffer_get_current (b[0]); + seq_num = clib_atomic_fetch_add (>[0]->gre_sn->seq_num, 1); + hdr = clib_host_to_net_u64 (ERSPAN_HDR2); + h0->seq_num = clib_host_to_net_u32 (seq_num); + h0->t2_u64 = hdr; + h0->t2.cos_en_t_session |= clib_host_to_net_u16 (gt[0]->session_id); + } + + if (PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED)) + { + gre_tx_trace_t *tr = vlib_add_trace (vm, node, b[0], sizeof (*tr)); + tr->tunnel_id = gt[0] - gm->tunnels; + tr->src = gt[0]->tunnel_src; + tr->dst = gt[0]->tunnel_dst.fp_addr; + tr->length = vlib_buffer_length_in_chain (vm, b[0]); + } + + b += 1; + n_left_from -= 1; + } + + vlib_buffer_enqueue_to_single_next ( + vm, node, from, GRE_ENCAP_NEXT_L2_MIDCHAIN, frame->n_vectors); + + vlib_node_increment_counter (vm, node->node_index, GRE_ERROR_PKTS_ENCAP, + frame->n_vectors); + + return frame->n_vectors; +} + +static char *gre_error_strings[] = { +#define gre_error(n, s) s, +#include "error.def" +#undef gre_error +}; + +VLIB_NODE_FN (gre_teb_encap_node) +(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame) +{ + return (gre_encap_inline (vm, node, frame, GRE_TUNNEL_TYPE_TEB)); +} + +VLIB_NODE_FN (gre_erspan_encap_node) +(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame) +{ + return (gre_encap_inline (vm, node, frame, GRE_TUNNEL_TYPE_ERSPAN)); +} + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (gre_teb_encap_node) = +{ + .name = "gre-teb-encap", + .vector_size = sizeof (u32), + .format_trace = format_gre_tx_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + .n_errors = GRE_N_ERROR, + .error_strings = gre_error_strings, + .n_next_nodes = GRE_ENCAP_N_NEXT, + .next_nodes = { + [GRE_ENCAP_NEXT_L2_MIDCHAIN] = "adj-l2-midchain", + }, +}; +VLIB_REGISTER_NODE (gre_erspan_encap_node) = +{ + .name = "gre-erspan-encap", + .vector_size = sizeof (u32), + .format_trace = format_gre_tx_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + .n_errors = GRE_N_ERROR, + .error_strings = gre_error_strings, + .n_next_nodes = GRE_ENCAP_N_NEXT, + .next_nodes = { + [GRE_ENCAP_NEXT_L2_MIDCHAIN] = "adj-l2-midchain", + }, +}; +/* *INDENT-ON* */ + +#ifndef CLIB_MARCH_VARIANT +static u8 * +format_gre_tunnel_name (u8 *s, va_list *args) +{ + u32 dev_instance = va_arg (*args, u32); + gre_main_t *gm = &gre_main; + gre_tunnel_t *t; + + if (dev_instance >= vec_len (gm->tunnels)) + return format (s, "<improperly-referenced>"); + + t = pool_elt_at_index (gm->tunnels, dev_instance); + return format (s, "gre%d", t->user_instance); +} + +static u8 * +format_gre_device (u8 *s, va_list *args) +{ + u32 dev_instance = va_arg (*args, u32); + CLIB_UNUSED (int verbose) = va_arg (*args, int); + + s = format (s, "GRE tunnel: id %d\n", dev_instance); + return s; +} + +static int +gre_tunnel_desc (u32 sw_if_index, ip46_address_t *src, ip46_address_t *dst, + u8 *is_l2) +{ + gre_main_t *gm = &gre_main; + gre_tunnel_t *t; + u32 ti; + + ti = gm->tunnel_index_by_sw_if_index[sw_if_index]; + + if (~0 == ti) + /* not one of ours */ + return -1; + + t = pool_elt_at_index (gm->tunnels, ti); + + *src = t->tunnel_src; + *dst = t->tunnel_dst.fp_addr; + *is_l2 = t->type == GRE_TUNNEL_TYPE_TEB; + + return (0); +} + +/* *INDENT-OFF* */ +VNET_DEVICE_CLASS (gre_device_class) = { + .name = "GRE tunnel device", + .format_device_name = format_gre_tunnel_name, + .format_device = format_gre_device, + .format_tx_trace = format_gre_tx_trace, + .admin_up_down_function = gre_interface_admin_up_down, + .ip_tun_desc = gre_tunnel_desc, +#ifdef SOON + .clear counter = 0; +#endif +} +; + +VNET_HW_INTERFACE_CLASS (gre_hw_interface_class) = { + .name = "GRE", + .format_header = format_gre_header_with_length, + .unformat_header = unformat_gre_header, + .build_rewrite = gre_build_rewrite, + .update_adjacency = gre_update_adj, + .flags = VNET_HW_INTERFACE_CLASS_FLAG_P2P, +}; + +VNET_HW_INTERFACE_CLASS (mgre_hw_interface_class) = { + .name = "mGRE", + .format_header = format_gre_header_with_length, + .unformat_header = unformat_gre_header, + .build_rewrite = gre_build_rewrite, + .update_adjacency = mgre_update_adj, + .flags = VNET_HW_INTERFACE_CLASS_FLAG_NBMA, +}; +/* *INDENT-ON* */ +#endif /* CLIB_MARCH_VARIANT */ + +static void +add_protocol (gre_main_t *gm, gre_protocol_t protocol, char *protocol_name) +{ + gre_protocol_info_t *pi; + u32 i; + + vec_add2 (gm->protocol_infos, pi, 1); + i = pi - gm->protocol_infos; + + pi->name = protocol_name; + pi->protocol = protocol; + pi->next_index = pi->node_index = ~0; + + hash_set (gm->protocol_info_by_protocol, protocol, i); + hash_set_mem (gm->protocol_info_by_name, pi->name, i); +} + +static clib_error_t * +gre_init (vlib_main_t *vm) +{ + gre_main_t *gm = &gre_main; + clib_error_t *error; + ip_main_t *im = &ip_main; + ip_protocol_info_t *pi; + + clib_memset (gm, 0, sizeof (gm[0])); + gm->vlib_main = vm; + gm->vnet_main = vnet_get_main (); + + if ((error = vlib_call_init_function (vm, ip_main_init))) + return error; + + if ((error = vlib_call_init_function (vm, ip4_lookup_init))) + return error; + + if ((error = vlib_call_init_function (vm, ip6_lookup_init))) + return error; + + /* Set up the ip packet generator */ + pi = ip_get_protocol_info (im, IP_PROTOCOL_GRE); + pi->format_header = format_gre_header; + pi->unformat_pg_edit = unformat_pg_gre_header; + + gm->protocol_info_by_name = hash_create_string (0, sizeof (uword)); + gm->protocol_info_by_protocol = hash_create (0, sizeof (uword)); + gm->tunnel_by_key4 = + hash_create_mem (0, sizeof (gre_tunnel_key4_t), sizeof (uword)); + gm->tunnel_by_key6 = + hash_create_mem (0, sizeof (gre_tunnel_key6_t), sizeof (uword)); + gm->seq_num_by_key = + hash_create_mem (0, sizeof (gre_sn_key_t), sizeof (uword)); + +#define _(n, s) add_protocol (gm, GRE_PROTOCOL_##s, #s); + foreach_gre_protocol +#undef _ + return vlib_call_init_function (vm, gre_input_init); +} + +VLIB_INIT_FUNCTION (gre_init); + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ diff --git a/src/plugins/gre/gre.h b/src/plugins/gre/gre.h new file mode 100644 index 00000000000..9e17efcf7ef --- /dev/null +++ b/src/plugins/gre/gre.h @@ -0,0 +1,443 @@ +/* + * gre.h: types/functions for gre. + * + * Copyright (c) 2012 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. + */ + +#ifndef included_gre_h +#define included_gre_h + +#include <vnet/vnet.h> +#include <vnet/gre/packet.h> +#include <vnet/ip/ip.h> +#include <vnet/ip/format.h> +#include <vnet/adj/adj_types.h> +#include <vnet/tunnel/tunnel.h> +#include <vnet/teib/teib.h> + +extern vnet_hw_interface_class_t gre_hw_interface_class; +extern vnet_hw_interface_class_t mgre_hw_interface_class; + +typedef enum +{ +#define gre_error(n,s) GRE_ERROR_##n, +#include <gre/error.def> +#undef gre_error + GRE_N_ERROR, +} gre_error_t; + +/** + * L3: GRE (i.e. this tunnel is in L3 mode) + * TEB: Transparent Ethernet Bridging - the tunnel is in L2 mode + * ERSPAN: type 2 - the tunnel is for port mirror SPAN output. Each tunnel is + * associated with a session ID and expected to be used for encap + * and output of mirrored packet from a L2 network only. There is + * no support for receiving ERSPAN packets from a GRE ERSPAN tunnel + */ +#define foreach_gre_tunnel_type \ + _(L3, "L3") \ + _(TEB, "TEB") \ + _(ERSPAN, "ERSPAN") \ + +/** + * @brief The GRE tunnel type + */ +typedef enum gre_tunnel_type_t_ +{ +#define _(n, s) GRE_TUNNEL_TYPE_##n, + foreach_gre_tunnel_type +#undef _ +} __clib_packed gre_tunnel_type_t; + +extern u8 *format_gre_tunnel_type (u8 * s, va_list * args); + + +/** + * A GRE payload protocol registration + */ +typedef struct +{ + /** Name (a c string). */ + char *name; + + /** GRE protocol type in host byte order. */ + gre_protocol_t protocol; + + /** GRE tunnel type */ + gre_tunnel_type_t tunnel_type; + + /** Node which handles this type. */ + u32 node_index; + + /** Next index for this type. */ + u32 next_index; +} gre_protocol_info_t; + +/** + * Elements of the GRE key that are common for v6 and v6 addresses + */ +typedef struct gre_tunnel_key_common_t_ +{ + union + { + struct + { + u32 fib_index; + u16 session_id; + gre_tunnel_type_t type; + tunnel_mode_t mode; + }; + u64 as_u64; + }; +} gre_tunnel_key_common_t; + +STATIC_ASSERT_SIZEOF (gre_tunnel_key_common_t, sizeof (u64)); + +/** + * @brief Key for a IPv4 GRE Tunnel + */ +typedef struct gre_tunnel_key4_t_ +{ + /** + * Source and destination IP addresses + */ + union + { + struct + { + ip4_address_t gtk_src; + ip4_address_t gtk_dst; + }; + u64 gtk_as_u64; + }; + + /** address independent attributes */ + gre_tunnel_key_common_t gtk_common; +} __attribute__ ((packed)) gre_tunnel_key4_t; + +STATIC_ASSERT_SIZEOF (gre_tunnel_key4_t, 2 * sizeof (u64)); + +/** + * @brief Key for a IPv6 GRE Tunnel + * We use a different type so that the V4 key hash is as small as possible + */ +typedef struct gre_tunnel_key6_t_ +{ + /** + * Source and destination IP addresses + */ + ip6_address_t gtk_src; + ip6_address_t gtk_dst; + + /** address independent attributes */ + gre_tunnel_key_common_t gtk_common; +} __attribute__ ((packed)) gre_tunnel_key6_t; + +STATIC_ASSERT_SIZEOF (gre_tunnel_key6_t, 5 * sizeof (u64)); + +/** + * Union of the two possible key types + */ +typedef union gre_tunnel_key_t_ +{ + gre_tunnel_key4_t gtk_v4; + gre_tunnel_key6_t gtk_v6; +} gre_tunnel_key_t; + +/** + * The session ID is only a 10 bit value + */ +#define GTK_SESSION_ID_MAX (0x3ff) + +/** + * Used for GRE header seq number generation for ERSPAN encap + */ +typedef struct +{ + u32 seq_num; + u32 ref_count; +} gre_sn_t; + +/** + * Hash key for GRE header seq number generation for ERSPAN encap + */ +typedef struct +{ + ip46_address_t src; + ip46_address_t dst; + u32 fib_index; +} gre_sn_key_t; + +/** + * @brief A representation of a GRE tunnel + */ +typedef struct +{ + /** + * Required for pool_get_aligned + */ + CLIB_CACHE_LINE_ALIGN_MARK (cacheline0); + + /** + * The tunnel's source/local address + */ + ip46_address_t tunnel_src; + /** + * The tunnel's destination/remote address + */ + fib_prefix_t tunnel_dst; + /** + * The FIB in which the src.dst address are present + */ + u32 outer_fib_index; + u32 hw_if_index; + u32 sw_if_index; + gre_tunnel_type_t type; + tunnel_mode_t mode; + tunnel_encap_decap_flags_t flags; + + /** + * an L2 tunnel always rquires an L2 midchain. cache here for DP. + */ + adj_index_t l2_adj_index; + + /** + * ERSPAN type 2 session ID, least significant 10 bits of u16 + */ + u16 session_id; + + /** + * GRE header sequence number (SN) used for ERSPAN type 2 header, must be + * bumped automically to be thread safe. As multiple GRE tunnels are created + * for the same fib-idx/DIP/SIP with different ERSPAN session number, they all + * share the same SN which is kept per FIB/DIP/SIP, as specified by RFC2890. + */ + gre_sn_t *gre_sn; + + + u32 dev_instance; /* Real device instance in tunnel vector */ + u32 user_instance; /* Instance name being shown to user */ +} gre_tunnel_t; + +typedef struct +{ + u8 next_index; + u8 tunnel_type; +} next_info_t; + +/** + * @brief GRE related global data + */ +typedef struct +{ + /** + * pool of tunnel instances + */ + gre_tunnel_t *tunnels; + + /** + * GRE payload protocol registrations + */ + gre_protocol_info_t *protocol_infos; + + /** + * Hash tables mapping name/protocol to protocol info index. + */ + uword *protocol_info_by_name, *protocol_info_by_protocol; + + /** + * Hash mapping to tunnels with ipv4 src/dst addr + */ + uword *tunnel_by_key4; + + /** + * Hash mapping to tunnels with ipv6 src/dst addr + */ + uword *tunnel_by_key6; + + /** + * Hash mapping tunnel src/dst addr and fib-idx to sequence number + */ + uword *seq_num_by_key; + + /** + * Mapping from sw_if_index to tunnel index + */ + u32 *tunnel_index_by_sw_if_index; + + /* Sparse vector mapping gre protocol in network byte order + to next index. */ + next_info_t *next_by_protocol; + + /* convenience */ + vlib_main_t *vlib_main; + vnet_main_t *vnet_main; + + /* Record used instances */ + uword *instance_used; + + u16 msg_id_base; +} gre_main_t; + +/** + * @brief IPv4 and GRE header. + */ +/* *INDENT-OFF* */ +typedef CLIB_PACKED (struct { + ip4_header_t ip4; + gre_header_t gre; +}) ip4_and_gre_header_t; +/* *INDENT-ON* */ + +/** + * @brief IPv6 and GRE header. + */ +/* *INDENT-OFF* */ +typedef CLIB_PACKED (struct { + ip6_header_t ip6; + gre_header_t gre; +}) ip6_and_gre_header_t; +/* *INDENT-ON* */ + +always_inline gre_protocol_info_t * +gre_get_protocol_info (gre_main_t * em, gre_protocol_t protocol) +{ + uword *p = hash_get (em->protocol_info_by_protocol, protocol); + return p ? vec_elt_at_index (em->protocol_infos, p[0]) : 0; +} + +extern gre_main_t gre_main; + +extern clib_error_t *gre_interface_admin_up_down (vnet_main_t * vnm, + u32 hw_if_index, u32 flags); + +extern void gre_tunnel_stack (adj_index_t ai); +extern void gre_update_adj (vnet_main_t * vnm, + u32 sw_if_index, adj_index_t ai); + +typedef struct mgre_walk_ctx_t_ +{ + const gre_tunnel_t *t; + const teib_entry_t *ne; +} mgre_walk_ctx_t; + +adj_walk_rc_t mgre_mk_complete_walk (adj_index_t ai, void *data); +adj_walk_rc_t mgre_mk_incomplete_walk (adj_index_t ai, void *data); + +format_function_t format_gre_protocol; +format_function_t format_gre_header; +format_function_t format_gre_header_with_length; + +extern vlib_node_registration_t gre4_input_node; +extern vlib_node_registration_t gre6_input_node; +extern vlib_node_registration_t gre_erspan_encap_node; +extern vlib_node_registration_t gre_teb_encap_node; +extern vnet_device_class_t gre_device_class; + +/* Parse gre protocol as 0xXXXX or protocol name. + In either host or network byte order. */ +unformat_function_t unformat_gre_protocol_host_byte_order; +unformat_function_t unformat_gre_protocol_net_byte_order; + +/* Parse gre header. */ +unformat_function_t unformat_gre_header; +unformat_function_t unformat_pg_gre_header; + +void +gre_register_input_protocol (vlib_main_t * vm, gre_protocol_t protocol, + u32 node_index, gre_tunnel_type_t tunnel_type); + +/* manually added to the interface output node in gre.c */ +#define GRE_OUTPUT_NEXT_LOOKUP 1 + +typedef struct +{ + u8 is_add; + gre_tunnel_type_t type; + tunnel_mode_t mode; + u8 is_ipv6; + u32 instance; + ip46_address_t src, dst; + u32 outer_table_id; + u16 session_id; + tunnel_encap_decap_flags_t flags; +} vnet_gre_tunnel_add_del_args_t; + +extern int vnet_gre_tunnel_add_del (vnet_gre_tunnel_add_del_args_t * a, + u32 * sw_if_indexp); + +static inline void +gre_mk_key4 (ip4_address_t src, + ip4_address_t dst, + u32 fib_index, + gre_tunnel_type_t ttype, + tunnel_mode_t tmode, u16 session_id, gre_tunnel_key4_t * key) +{ + key->gtk_src = src; + key->gtk_dst = dst; + key->gtk_common.type = ttype; + key->gtk_common.mode = tmode; + key->gtk_common.fib_index = fib_index; + key->gtk_common.session_id = session_id; +} + +static inline int +gre_match_key4 (const gre_tunnel_key4_t * key1, + const gre_tunnel_key4_t * key2) +{ + return ((key1->gtk_as_u64 == key2->gtk_as_u64) && + (key1->gtk_common.as_u64 == key2->gtk_common.as_u64)); +} + +static inline void +gre_mk_key6 (const ip6_address_t * src, + const ip6_address_t * dst, + u32 fib_index, + gre_tunnel_type_t ttype, + tunnel_mode_t tmode, u16 session_id, gre_tunnel_key6_t * key) +{ + key->gtk_src = *src; + key->gtk_dst = *dst; + key->gtk_common.type = ttype; + key->gtk_common.mode = tmode; + key->gtk_common.fib_index = fib_index; + key->gtk_common.session_id = session_id; +} + +static inline int +gre_match_key6 (const gre_tunnel_key6_t * key1, + const gre_tunnel_key6_t * key2) +{ + return (ip6_address_is_equal (&key1->gtk_src, &key2->gtk_src) && + ip6_address_is_equal (&key1->gtk_dst, &key2->gtk_dst) && + (key1->gtk_common.as_u64 == key2->gtk_common.as_u64)); +} + +static inline void +gre_mk_sn_key (const gre_tunnel_t * gt, gre_sn_key_t * key) +{ + key->src = gt->tunnel_src; + key->dst = gt->tunnel_dst.fp_addr; + key->fib_index = gt->outer_fib_index; +} + +#endif /* included_gre_h */ + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ diff --git a/src/plugins/gre/gre_api.c b/src/plugins/gre/gre_api.c new file mode 100644 index 00000000000..f8e3ea654fc --- /dev/null +++ b/src/plugins/gre/gre_api.c @@ -0,0 +1,218 @@ +/* + *------------------------------------------------------------------ + * gre_api.c - gre api + * + * 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. + *------------------------------------------------------------------ + */ + +#include <vnet/vnet.h> +#include <vlibmemory/api.h> + +#include <vnet/interface.h> +#include <vnet/api_errno.h> + +#include <gre/gre.h> +#include <vnet/fib/fib_table.h> +#include <vnet/tunnel/tunnel_types_api.h> +#include <vnet/ip/ip_types_api.h> + +#include <gre/gre.api_enum.h> +#include <gre/gre.api_types.h> + +#define REPLY_MSG_ID_BASE gre_main.msg_id_base +#include <vlibapi/api_helper_macros.h> + +static int +gre_tunnel_type_decode (vl_api_gre_tunnel_type_t in, gre_tunnel_type_t *out) +{ + switch (in) + { +#define _(n, v) \ + case GRE_API_TUNNEL_TYPE_##n: \ + *out = GRE_TUNNEL_TYPE_##n; \ + return (0); + foreach_gre_tunnel_type +#undef _ + } + + return (VNET_API_ERROR_INVALID_VALUE); +} + +static vl_api_gre_tunnel_type_t +gre_tunnel_type_encode (gre_tunnel_type_t in) +{ + vl_api_gre_tunnel_type_t out = GRE_API_TUNNEL_TYPE_L3; + + switch (in) + { +#define _(n, v) \ + case GRE_TUNNEL_TYPE_##n: \ + out = GRE_API_TUNNEL_TYPE_##n; \ + break; + foreach_gre_tunnel_type +#undef _ + } + + return (out); +} + +static void +vl_api_gre_tunnel_add_del_t_handler (vl_api_gre_tunnel_add_del_t *mp) +{ + vnet_gre_tunnel_add_del_args_t _a = {}, *a = &_a; + vl_api_gre_tunnel_add_del_reply_t *rmp; + tunnel_encap_decap_flags_t flags; + u32 sw_if_index = ~0; + ip46_type_t itype[2]; + int rv = 0; + + itype[0] = ip_address_decode (&mp->tunnel.src, &a->src); + itype[1] = ip_address_decode (&mp->tunnel.dst, &a->dst); + + if (itype[0] != itype[1]) + { + rv = VNET_API_ERROR_INVALID_PROTOCOL; + goto out; + } + + if (ip46_address_is_equal (&a->src, &a->dst)) + { + rv = VNET_API_ERROR_SAME_SRC_DST; + goto out; + } + + rv = gre_tunnel_type_decode (mp->tunnel.type, &a->type); + + if (rv) + goto out; + + rv = tunnel_mode_decode (mp->tunnel.mode, &a->mode); + + if (rv) + goto out; + + rv = tunnel_encap_decap_flags_decode (mp->tunnel.flags, &flags); + + if (rv) + goto out; + + a->is_add = mp->is_add; + a->is_ipv6 = (itype[0] == IP46_TYPE_IP6); + a->instance = ntohl (mp->tunnel.instance); + a->session_id = ntohs (mp->tunnel.session_id); + a->outer_table_id = ntohl (mp->tunnel.outer_table_id); + a->flags = flags; + + rv = vnet_gre_tunnel_add_del (a, &sw_if_index); + +out: + /* *INDENT-OFF* */ + REPLY_MACRO2 (VL_API_GRE_TUNNEL_ADD_DEL_REPLY, + ({ rmp->sw_if_index = ntohl (sw_if_index); })); + /* *INDENT-ON* */ +} + +static void +send_gre_tunnel_details (gre_tunnel_t *t, vl_api_gre_tunnel_dump_t *mp) +{ + vl_api_gre_tunnel_details_t *rmp; + + /* *INDENT-OFF* */ + REPLY_MACRO_DETAILS2 ( + VL_API_GRE_TUNNEL_DETAILS, ({ + ip_address_encode (&t->tunnel_src, IP46_TYPE_ANY, &rmp->tunnel.src); + ip_address_encode (&t->tunnel_dst.fp_addr, IP46_TYPE_ANY, + &rmp->tunnel.dst); + + rmp->tunnel.outer_table_id = htonl ( + fib_table_get_table_id (t->outer_fib_index, t->tunnel_dst.fp_proto)); + + rmp->tunnel.type = gre_tunnel_type_encode (t->type); + rmp->tunnel.mode = tunnel_mode_encode (t->mode); + rmp->tunnel.flags = tunnel_encap_decap_flags_encode (t->flags); + rmp->tunnel.instance = htonl (t->user_instance); + rmp->tunnel.sw_if_index = htonl (t->sw_if_index); + rmp->tunnel.session_id = htons (t->session_id); + })); + /* *INDENT-ON* */ +} + +static void +vl_api_gre_tunnel_dump_t_handler (vl_api_gre_tunnel_dump_t *mp) +{ + vl_api_registration_t *reg; + gre_main_t *gm = &gre_main; + gre_tunnel_t *t; + u32 sw_if_index; + + reg = vl_api_client_index_to_registration (mp->client_index); + if (!reg) + return; + + sw_if_index = ntohl (mp->sw_if_index); + + if (~0 == sw_if_index) + { + /* *INDENT-OFF* */ + pool_foreach (t, gm->tunnels) + { + send_gre_tunnel_details (t, mp); + } + /* *INDENT-ON* */ + } + + else + { + if ((sw_if_index >= vec_len (gm->tunnel_index_by_sw_if_index)) || + (~0 == gm->tunnel_index_by_sw_if_index[sw_if_index])) + { + return; + } + t = &gm->tunnels[gm->tunnel_index_by_sw_if_index[sw_if_index]]; + send_gre_tunnel_details (t, mp); + } +} + +/* + * gre_api_hookup + * Add vpe's API message handlers to the table. + * vlib has already mapped shared memory and + * added the client registration handlers. + * See .../vlib-api/vlibmemory/memclnt_vlib.c:memclnt_process() + */ +/* API definitions */ +#include <vnet/format_fns.h> +#include <gre/gre.api.c> + +static clib_error_t * +gre_api_hookup (vlib_main_t *vm) +{ + /* + * Set up the (msg_name, crc, message-id) table + */ + gre_main.msg_id_base = setup_message_id_table (); + + return 0; +} + +VLIB_API_INIT_FUNCTION (gre_api_hookup); + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ diff --git a/src/plugins/gre/interface.c b/src/plugins/gre/interface.c new file mode 100644 index 00000000000..8d93ebd0cf5 --- /dev/null +++ b/src/plugins/gre/interface.c @@ -0,0 +1,832 @@ +/* + * gre_interface.c: gre interfaces + * + * Copyright (c) 2012 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. + */ + +#include <vnet/vnet.h> +#include <gre/gre.h> +#include <vnet/ip/format.h> +#include <vnet/fib/fib_table.h> +#include <vnet/adj/adj_midchain.h> +#include <vnet/adj/adj_nbr.h> +#include <vnet/mpls/mpls.h> +#include <vnet/l2/l2_input.h> +#include <vnet/teib/teib.h> + +u8 * +format_gre_tunnel_type (u8 *s, va_list *args) +{ + gre_tunnel_type_t type = va_arg (*args, int); + + switch (type) + { +#define _(n, v) \ + case GRE_TUNNEL_TYPE_##n: \ + s = format (s, "%s", v); \ + break; + foreach_gre_tunnel_type +#undef _ + } + + return (s); +} + +static u8 * +format_gre_tunnel (u8 *s, va_list *args) +{ + gre_tunnel_t *t = va_arg (*args, gre_tunnel_t *); + + s = format (s, "[%d] instance %d src %U dst %U fib-idx %d sw-if-idx %d ", + t->dev_instance, t->user_instance, format_ip46_address, + &t->tunnel_src, IP46_TYPE_ANY, format_ip46_address, + &t->tunnel_dst.fp_addr, IP46_TYPE_ANY, t->outer_fib_index, + t->sw_if_index); + + s = format (s, "payload %U ", format_gre_tunnel_type, t->type); + s = format (s, "%U ", format_tunnel_mode, t->mode); + + if (t->type == GRE_TUNNEL_TYPE_ERSPAN) + s = format (s, "session %d ", t->session_id); + + if (t->type != GRE_TUNNEL_TYPE_L3) + s = format (s, "l2-adj-idx %d ", t->l2_adj_index); + + return s; +} + +static gre_tunnel_t * +gre_tunnel_db_find (const vnet_gre_tunnel_add_del_args_t *a, + u32 outer_fib_index, gre_tunnel_key_t *key) +{ + gre_main_t *gm = &gre_main; + uword *p; + + if (!a->is_ipv6) + { + gre_mk_key4 (a->src.ip4, a->dst.ip4, outer_fib_index, a->type, a->mode, + a->session_id, &key->gtk_v4); + p = hash_get_mem (gm->tunnel_by_key4, &key->gtk_v4); + } + else + { + gre_mk_key6 (&a->src.ip6, &a->dst.ip6, outer_fib_index, a->type, a->mode, + a->session_id, &key->gtk_v6); + p = hash_get_mem (gm->tunnel_by_key6, &key->gtk_v6); + } + + if (NULL == p) + return (NULL); + + return (pool_elt_at_index (gm->tunnels, p[0])); +} + +static void +gre_tunnel_db_add (gre_tunnel_t *t, gre_tunnel_key_t *key) +{ + gre_main_t *gm = &gre_main; + + if (t->tunnel_dst.fp_proto == FIB_PROTOCOL_IP6) + { + hash_set_mem_alloc (&gm->tunnel_by_key6, &key->gtk_v6, t->dev_instance); + } + else + { + hash_set_mem_alloc (&gm->tunnel_by_key4, &key->gtk_v4, t->dev_instance); + } +} + +static void +gre_tunnel_db_remove (gre_tunnel_t *t, gre_tunnel_key_t *key) +{ + gre_main_t *gm = &gre_main; + + if (t->tunnel_dst.fp_proto == FIB_PROTOCOL_IP6) + { + hash_unset_mem_free (&gm->tunnel_by_key6, &key->gtk_v6); + } + else + { + hash_unset_mem_free (&gm->tunnel_by_key4, &key->gtk_v4); + } +} + +/** + * gre_tunnel_stack + * + * 'stack' (resolve the recursion for) the tunnel's midchain adjacency + */ +void +gre_tunnel_stack (adj_index_t ai) +{ + gre_main_t *gm = &gre_main; + ip_adjacency_t *adj; + gre_tunnel_t *gt; + u32 sw_if_index; + + adj = adj_get (ai); + sw_if_index = adj->rewrite_header.sw_if_index; + + if ((vec_len (gm->tunnel_index_by_sw_if_index) <= sw_if_index) || + (~0 == gm->tunnel_index_by_sw_if_index[sw_if_index])) + return; + + gt = pool_elt_at_index (gm->tunnels, + gm->tunnel_index_by_sw_if_index[sw_if_index]); + + if ((vnet_hw_interface_get_flags (vnet_get_main (), gt->hw_if_index) & + VNET_HW_INTERFACE_FLAG_LINK_UP) == 0) + { + adj_midchain_delegate_unstack (ai); + } + else + { + adj_midchain_delegate_stack (ai, gt->outer_fib_index, >->tunnel_dst); + } +} + +/** + * mgre_tunnel_stack + * + * 'stack' (resolve the recursion for) the tunnel's midchain adjacency + */ +static void +mgre_tunnel_stack (adj_index_t ai) +{ + gre_main_t *gm = &gre_main; + const ip_adjacency_t *adj; + const gre_tunnel_t *gt; + u32 sw_if_index; + + adj = adj_get (ai); + sw_if_index = adj->rewrite_header.sw_if_index; + + if ((vec_len (gm->tunnel_index_by_sw_if_index) <= sw_if_index) || + (~0 == gm->tunnel_index_by_sw_if_index[sw_if_index])) + return; + + gt = pool_elt_at_index (gm->tunnels, + gm->tunnel_index_by_sw_if_index[sw_if_index]); + + if ((vnet_hw_interface_get_flags (vnet_get_main (), gt->hw_if_index) & + VNET_HW_INTERFACE_FLAG_LINK_UP) == 0) + { + adj_midchain_delegate_unstack (ai); + } + else + { + const teib_entry_t *ne; + + ne = teib_entry_find_46 (sw_if_index, adj->ia_nh_proto, + &adj->sub_type.nbr.next_hop); + if (NULL != ne) + teib_entry_adj_stack (ne, ai); + } +} + +/** + * @brief Call back when restacking all adjacencies on a GRE interface + */ +static adj_walk_rc_t +gre_adj_walk_cb (adj_index_t ai, void *ctx) +{ + gre_tunnel_stack (ai); + + return (ADJ_WALK_RC_CONTINUE); +} +static adj_walk_rc_t +mgre_adj_walk_cb (adj_index_t ai, void *ctx) +{ + mgre_tunnel_stack (ai); + + return (ADJ_WALK_RC_CONTINUE); +} + +static void +gre_tunnel_restack (gre_tunnel_t *gt) +{ + fib_protocol_t proto; + + /* + * walk all the adjacencies on th GRE interface and restack them + */ + FOR_EACH_FIB_IP_PROTOCOL (proto) + { + switch (gt->mode) + { + case TUNNEL_MODE_P2P: + adj_nbr_walk (gt->sw_if_index, proto, gre_adj_walk_cb, NULL); + break; + case TUNNEL_MODE_MP: + adj_nbr_walk (gt->sw_if_index, proto, mgre_adj_walk_cb, NULL); + break; + } + } +} + +static void +gre_teib_mk_key (const gre_tunnel_t *t, const teib_entry_t *ne, + gre_tunnel_key_t *key) +{ + const fib_prefix_t *nh; + + nh = teib_entry_get_nh (ne); + + /* construct the key using mode P2P so it can be found in the DP */ + if (FIB_PROTOCOL_IP4 == nh->fp_proto) + gre_mk_key4 (t->tunnel_src.ip4, nh->fp_addr.ip4, + teib_entry_get_fib_index (ne), t->type, TUNNEL_MODE_P2P, 0, + &key->gtk_v4); + else + gre_mk_key6 (&t->tunnel_src.ip6, &nh->fp_addr.ip6, + teib_entry_get_fib_index (ne), t->type, TUNNEL_MODE_P2P, 0, + &key->gtk_v6); +} + +/** + * An TEIB entry has been added + */ +static void +gre_teib_entry_added (const teib_entry_t *ne) +{ + gre_main_t *gm = &gre_main; + const ip_address_t *nh; + gre_tunnel_key_t key; + gre_tunnel_t *t; + u32 sw_if_index; + u32 t_idx; + + sw_if_index = teib_entry_get_sw_if_index (ne); + if (vec_len (gm->tunnel_index_by_sw_if_index) < sw_if_index) + return; + + t_idx = gm->tunnel_index_by_sw_if_index[sw_if_index]; + + if (INDEX_INVALID == t_idx) + return; + + /* entry has been added on an interface for which there is a GRE tunnel */ + t = pool_elt_at_index (gm->tunnels, t_idx); + + if (t->mode != TUNNEL_MODE_MP) + return; + + /* the next-hop (underlay) of the NHRP entry will form part of the key for + * ingress lookup to match packets to this interface */ + gre_teib_mk_key (t, ne, &key); + gre_tunnel_db_add (t, &key); + + /* update the rewrites for each of the adjacencies for this peer (overlay) + * using the next-hop (underlay) */ + mgre_walk_ctx_t ctx = { .t = t, .ne = ne }; + nh = teib_entry_get_peer (ne); + adj_nbr_walk_nh ( + teib_entry_get_sw_if_index (ne), + (AF_IP4 == ip_addr_version (nh) ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6), + &ip_addr_46 (nh), mgre_mk_complete_walk, &ctx); +} + +static void +gre_teib_entry_deleted (const teib_entry_t *ne) +{ + gre_main_t *gm = &gre_main; + const ip_address_t *nh; + gre_tunnel_key_t key; + gre_tunnel_t *t; + u32 sw_if_index; + u32 t_idx; + + sw_if_index = teib_entry_get_sw_if_index (ne); + if (vec_len (gm->tunnel_index_by_sw_if_index) < sw_if_index) + return; + + t_idx = gm->tunnel_index_by_sw_if_index[sw_if_index]; + + if (INDEX_INVALID == t_idx) + return; + + t = pool_elt_at_index (gm->tunnels, t_idx); + + /* remove the next-hop as an ingress lookup key */ + gre_teib_mk_key (t, ne, &key); + gre_tunnel_db_remove (t, &key); + + nh = teib_entry_get_peer (ne); + + /* make all the adjacencies incomplete */ + adj_nbr_walk_nh ( + teib_entry_get_sw_if_index (ne), + (AF_IP4 == ip_addr_version (nh) ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6), + &ip_addr_46 (nh), mgre_mk_incomplete_walk, t); +} + +static walk_rc_t +gre_tunnel_delete_teib_walk (index_t nei, void *ctx) +{ + gre_tunnel_t *t = ctx; + gre_tunnel_key_t key; + + gre_teib_mk_key (t, teib_entry_get (nei), &key); + gre_tunnel_db_remove (t, &key); + + return (WALK_CONTINUE); +} + +static walk_rc_t +gre_tunnel_add_teib_walk (index_t nei, void *ctx) +{ + gre_tunnel_t *t = ctx; + gre_tunnel_key_t key = {}; + + gre_teib_mk_key (t, teib_entry_get (nei), &key); + gre_tunnel_db_add (t, &key); + + return (WALK_CONTINUE); +} + +static int +vnet_gre_tunnel_add (vnet_gre_tunnel_add_del_args_t *a, u32 outer_fib_index, + u32 *sw_if_indexp) +{ + gre_main_t *gm = &gre_main; + vnet_main_t *vnm = gm->vnet_main; + gre_tunnel_t *t; + vnet_hw_interface_t *hi; + u32 hw_if_index, sw_if_index; + u8 is_ipv6 = a->is_ipv6; + gre_tunnel_key_t key; + + t = gre_tunnel_db_find (a, outer_fib_index, &key); + if (NULL != t) + return VNET_API_ERROR_IF_ALREADY_EXISTS; + + pool_get_aligned (gm->tunnels, t, CLIB_CACHE_LINE_BYTES); + clib_memset (t, 0, sizeof (*t)); + + /* Reconcile the real dev_instance and a possible requested instance */ + u32 t_idx = t - gm->tunnels; /* tunnel index (or instance) */ + u32 u_idx = a->instance; /* user specified instance */ + if (u_idx == ~0) + u_idx = t_idx; + if (hash_get (gm->instance_used, u_idx)) + { + pool_put (gm->tunnels, t); + return VNET_API_ERROR_INSTANCE_IN_USE; + } + hash_set (gm->instance_used, u_idx, 1); + + t->dev_instance = t_idx; /* actual */ + t->user_instance = u_idx; /* name */ + + t->type = a->type; + t->mode = a->mode; + t->flags = a->flags; + if (t->type == GRE_TUNNEL_TYPE_ERSPAN) + t->session_id = a->session_id; + + if (t->type == GRE_TUNNEL_TYPE_L3) + { + if (t->mode == TUNNEL_MODE_P2P) + hw_if_index = + vnet_register_interface (vnm, gre_device_class.index, t_idx, + gre_hw_interface_class.index, t_idx); + else + hw_if_index = + vnet_register_interface (vnm, gre_device_class.index, t_idx, + mgre_hw_interface_class.index, t_idx); + } + else + { + vnet_eth_interface_registration_t eir = {}; + + /* Default MAC address (d00b:eed0:0000 + sw_if_index) */ + u8 address[6] = { + 0xd0, 0x0b, 0xee, 0xd0, (u8) (t_idx >> 8), (u8) t_idx + }; + + eir.dev_class_index = gre_device_class.index; + eir.dev_instance = t_idx; + eir.address = address; + hw_if_index = vnet_eth_register_interface (vnm, &eir); + } + + /* Set GRE tunnel interface output node (not used for L3 payload) */ + if (GRE_TUNNEL_TYPE_ERSPAN == t->type) + vnet_set_interface_output_node (vnm, hw_if_index, + gre_erspan_encap_node.index); + else + vnet_set_interface_output_node (vnm, hw_if_index, + gre_teb_encap_node.index); + + hi = vnet_get_hw_interface (vnm, hw_if_index); + sw_if_index = hi->sw_if_index; + + t->hw_if_index = hw_if_index; + t->outer_fib_index = outer_fib_index; + t->sw_if_index = sw_if_index; + t->l2_adj_index = ADJ_INDEX_INVALID; + + vec_validate_init_empty (gm->tunnel_index_by_sw_if_index, sw_if_index, ~0); + gm->tunnel_index_by_sw_if_index[sw_if_index] = t_idx; + + if (!is_ipv6) + { + hi->frame_overhead = sizeof (gre_header_t) + sizeof (ip4_header_t); + hi->min_frame_size = hi->frame_overhead + 64; + } + else + { + hi->frame_overhead = sizeof (gre_header_t) + sizeof (ip6_header_t); + hi->min_frame_size = hi->frame_overhead + 64; + } + + /* Standard default gre MTU. */ + vnet_sw_interface_set_mtu (vnm, sw_if_index, 9000); + + /* + * source the FIB entry for the tunnel's destination + * and become a child thereof. The tunnel will then get poked + * when the forwarding for the entry updates, and the tunnel can + * re-stack accordingly + */ + + clib_memcpy (&t->tunnel_src, &a->src, sizeof (t->tunnel_src)); + t->tunnel_dst.fp_len = !is_ipv6 ? 32 : 128; + t->tunnel_dst.fp_proto = !is_ipv6 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6; + t->tunnel_dst.fp_addr = a->dst; + + gre_tunnel_db_add (t, &key); + + if (t->mode == TUNNEL_MODE_MP) + teib_walk_itf (t->sw_if_index, gre_tunnel_add_teib_walk, t); + + if (t->type == GRE_TUNNEL_TYPE_ERSPAN) + { + gre_sn_key_t skey; + gre_sn_t *gre_sn; + + gre_mk_sn_key (t, &skey); + gre_sn = (gre_sn_t *) hash_get_mem (gm->seq_num_by_key, &skey); + if (gre_sn != NULL) + { + gre_sn->ref_count++; + t->gre_sn = gre_sn; + } + else + { + gre_sn = clib_mem_alloc (sizeof (gre_sn_t)); + gre_sn->seq_num = 0; + gre_sn->ref_count = 1; + t->gre_sn = gre_sn; + hash_set_mem_alloc (&gm->seq_num_by_key, &skey, (uword) gre_sn); + } + } + + if (t->type != GRE_TUNNEL_TYPE_L3) + { + t->l2_adj_index = adj_nbr_add_or_lock ( + t->tunnel_dst.fp_proto, VNET_LINK_ETHERNET, &zero_addr, sw_if_index); + vnet_set_interface_l3_output_node (gm->vlib_main, sw_if_index, + (u8 *) "tunnel-output-no-count"); + gre_update_adj (vnm, t->sw_if_index, t->l2_adj_index); + } + else + { + vnet_set_interface_l3_output_node (gm->vlib_main, sw_if_index, + (u8 *) "tunnel-output"); + } + if (sw_if_indexp) + *sw_if_indexp = sw_if_index; + + /* register gre46-input nodes */ + ip4_register_protocol (IP_PROTOCOL_GRE, gre4_input_node.index); + ip6_register_protocol (IP_PROTOCOL_GRE, gre6_input_node.index); + + return 0; +} + +static int +vnet_gre_tunnel_delete (vnet_gre_tunnel_add_del_args_t *a, u32 outer_fib_index, + u32 *sw_if_indexp) +{ + gre_main_t *gm = &gre_main; + vnet_main_t *vnm = gm->vnet_main; + gre_tunnel_t *t; + gre_tunnel_key_t key; + u32 sw_if_index; + + t = gre_tunnel_db_find (a, outer_fib_index, &key); + if (NULL == t) + return VNET_API_ERROR_NO_SUCH_ENTRY; + + if (t->mode == TUNNEL_MODE_MP) + teib_walk_itf (t->sw_if_index, gre_tunnel_delete_teib_walk, t); + + sw_if_index = t->sw_if_index; + vnet_sw_interface_set_flags (vnm, sw_if_index, 0 /* down */); + + /* make sure tunnel is removed from l2 bd or xconnect */ + set_int_l2_mode (gm->vlib_main, vnm, MODE_L3, sw_if_index, 0, + L2_BD_PORT_TYPE_NORMAL, 0, 0); + gm->tunnel_index_by_sw_if_index[sw_if_index] = ~0; + + if (t->type == GRE_TUNNEL_TYPE_L3) + vnet_delete_hw_interface (vnm, t->hw_if_index); + else + ethernet_delete_interface (vnm, t->hw_if_index); + + if (t->l2_adj_index != ADJ_INDEX_INVALID) + { + adj_midchain_delegate_unstack (t->l2_adj_index); + adj_unlock (t->l2_adj_index); + } + + ASSERT ((t->type != GRE_TUNNEL_TYPE_ERSPAN) || (t->gre_sn != NULL)); + if ((t->type == GRE_TUNNEL_TYPE_ERSPAN) && (t->gre_sn->ref_count-- == 1)) + { + gre_sn_key_t skey; + gre_mk_sn_key (t, &skey); + hash_unset_mem_free (&gm->seq_num_by_key, &skey); + clib_mem_free (t->gre_sn); + } + + vnet_reset_interface_l3_output_node (gm->vlib_main, sw_if_index); + hash_unset (gm->instance_used, t->user_instance); + gre_tunnel_db_remove (t, &key); + pool_put (gm->tunnels, t); + + if (sw_if_indexp) + *sw_if_indexp = sw_if_index; + + return 0; +} + +int +vnet_gre_tunnel_add_del (vnet_gre_tunnel_add_del_args_t *a, u32 *sw_if_indexp) +{ + u32 outer_fib_index; + + outer_fib_index = fib_table_find ( + (a->is_ipv6 ? FIB_PROTOCOL_IP6 : FIB_PROTOCOL_IP4), a->outer_table_id); + + if (~0 == outer_fib_index) + return VNET_API_ERROR_NO_SUCH_FIB; + + if (a->session_id > GTK_SESSION_ID_MAX) + return VNET_API_ERROR_INVALID_SESSION_ID; + + if (a->mode == TUNNEL_MODE_MP && !ip46_address_is_zero (&a->dst)) + return (VNET_API_ERROR_INVALID_DST_ADDRESS); + + if (a->is_add) + return (vnet_gre_tunnel_add (a, outer_fib_index, sw_if_indexp)); + else + return (vnet_gre_tunnel_delete (a, outer_fib_index, sw_if_indexp)); +} + +clib_error_t * +gre_interface_admin_up_down (vnet_main_t *vnm, u32 hw_if_index, u32 flags) +{ + gre_main_t *gm = &gre_main; + vnet_hw_interface_t *hi; + gre_tunnel_t *t; + u32 ti; + + hi = vnet_get_hw_interface (vnm, hw_if_index); + + if (NULL == gm->tunnel_index_by_sw_if_index || + hi->sw_if_index >= vec_len (gm->tunnel_index_by_sw_if_index)) + return (NULL); + + ti = gm->tunnel_index_by_sw_if_index[hi->sw_if_index]; + + if (~0 == ti) + /* not one of ours */ + return (NULL); + + t = pool_elt_at_index (gm->tunnels, ti); + + if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) + vnet_hw_interface_set_flags (vnm, hw_if_index, + VNET_HW_INTERFACE_FLAG_LINK_UP); + else + vnet_hw_interface_set_flags (vnm, hw_if_index, 0 /* down */); + + gre_tunnel_restack (t); + + return /* no error */ 0; +} + +static clib_error_t * +create_gre_tunnel_command_fn (vlib_main_t *vm, unformat_input_t *input, + vlib_cli_command_t *cmd) +{ + unformat_input_t _line_input, *line_input = &_line_input; + vnet_gre_tunnel_add_del_args_t _a, *a = &_a; + ip46_address_t src = ip46_address_initializer, + dst = ip46_address_initializer; + u32 instance = ~0; + u32 outer_table_id = 0; + gre_tunnel_type_t t_type = GRE_TUNNEL_TYPE_L3; + tunnel_mode_t t_mode = TUNNEL_MODE_P2P; + tunnel_encap_decap_flags_t flags = TUNNEL_ENCAP_DECAP_FLAG_NONE; + u32 session_id = 0; + int rv; + u8 is_add = 1; + u32 sw_if_index; + clib_error_t *error = NULL; + + /* Get a line of input. */ + if (!unformat_user (input, unformat_line_input, line_input)) + return 0; + + while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT) + { + if (unformat (line_input, "del")) + is_add = 0; + else if (unformat (line_input, "instance %d", &instance)) + ; + else if (unformat (line_input, "src %U", unformat_ip46_address, &src)) + ; + else if (unformat (line_input, "dst %U", unformat_ip46_address, &dst)) + ; + else if (unformat (line_input, "outer-table-id %d", &outer_table_id)) + ; + else if (unformat (line_input, "multipoint")) + t_mode = TUNNEL_MODE_MP; + else if (unformat (line_input, "teb")) + t_type = GRE_TUNNEL_TYPE_TEB; + else if (unformat (line_input, "erspan %d", &session_id)) + t_type = GRE_TUNNEL_TYPE_ERSPAN; + else if (unformat (line_input, "flags %U", + unformat_tunnel_encap_decap_flags, &flags)) + ; + else + { + error = clib_error_return (0, "unknown input `%U'", + format_unformat_error, line_input); + goto done; + } + } + + if (ip46_address_is_equal (&src, &dst)) + { + error = clib_error_return (0, "src and dst are identical"); + goto done; + } + + if (t_mode != TUNNEL_MODE_MP && ip46_address_is_zero (&dst)) + { + error = clib_error_return (0, "destination address not specified"); + goto done; + } + + if (ip46_address_is_zero (&src)) + { + error = clib_error_return (0, "source address not specified"); + goto done; + } + + if (ip46_address_is_ip4 (&src) != ip46_address_is_ip4 (&dst)) + { + error = clib_error_return (0, "src and dst address must be the same AF"); + goto done; + } + + clib_memset (a, 0, sizeof (*a)); + a->is_add = is_add; + a->outer_table_id = outer_table_id; + a->type = t_type; + a->mode = t_mode; + a->session_id = session_id; + a->is_ipv6 = !ip46_address_is_ip4 (&src); + a->instance = instance; + a->flags = flags; + clib_memcpy (&a->src, &src, sizeof (a->src)); + clib_memcpy (&a->dst, &dst, sizeof (a->dst)); + + rv = vnet_gre_tunnel_add_del (a, &sw_if_index); + + switch (rv) + { + case 0: + vlib_cli_output (vm, "%U\n", format_vnet_sw_if_index_name, + vnet_get_main (), sw_if_index); + break; + case VNET_API_ERROR_IF_ALREADY_EXISTS: + error = clib_error_return (0, "GRE tunnel already exists..."); + goto done; + case VNET_API_ERROR_NO_SUCH_FIB: + error = clib_error_return (0, "outer table ID %d doesn't exist\n", + outer_table_id); + goto done; + case VNET_API_ERROR_NO_SUCH_ENTRY: + error = clib_error_return (0, "GRE tunnel doesn't exist"); + goto done; + case VNET_API_ERROR_INVALID_SESSION_ID: + error = + clib_error_return (0, "session ID %d out of range\n", session_id); + goto done; + case VNET_API_ERROR_INSTANCE_IN_USE: + error = clib_error_return (0, "Instance is in use"); + goto done; + default: + error = clib_error_return (0, "vnet_gre_tunnel_add_del returned %d", rv); + goto done; + } + +done: + unformat_free (line_input); + + return error; +} + +/* *INDENT-OFF* */ +VLIB_CLI_COMMAND (create_gre_tunnel_command, static) = { + .path = "create gre tunnel", + .short_help = "create gre tunnel src <addr> dst <addr> [instance <n>] " + "[outer-fib-id <fib>] [teb | erspan <session-id>] [del] " + "[multipoint]", + .function = create_gre_tunnel_command_fn, +}; +/* *INDENT-ON* */ + +static clib_error_t * +show_gre_tunnel_command_fn (vlib_main_t *vm, unformat_input_t *input, + vlib_cli_command_t *cmd) +{ + gre_main_t *gm = &gre_main; + gre_tunnel_t *t; + u32 ti = ~0; + + if (pool_elts (gm->tunnels) == 0) + vlib_cli_output (vm, "No GRE tunnels configured..."); + + while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) + { + if (unformat (input, "%d", &ti)) + ; + else + break; + } + + if (~0 == ti) + { + /* *INDENT-OFF* */ + pool_foreach (t, gm->tunnels) + { + vlib_cli_output (vm, "%U", format_gre_tunnel, t); + } + /* *INDENT-ON* */ + } + else + { + t = pool_elt_at_index (gm->tunnels, ti); + + vlib_cli_output (vm, "%U", format_gre_tunnel, t); + } + + return 0; +} + +/* *INDENT-OFF* */ +VLIB_CLI_COMMAND (show_gre_tunnel_command, static) = { + .path = "show gre tunnel", + .function = show_gre_tunnel_command_fn, +}; +/* *INDENT-ON* */ + +const static teib_vft_t gre_teib_vft = { + .nv_added = gre_teib_entry_added, + .nv_deleted = gre_teib_entry_deleted, +}; + +/* force inclusion from application's main.c */ +clib_error_t * +gre_interface_init (vlib_main_t *vm) +{ + teib_register (&gre_teib_vft); + + return (NULL); +} + +VLIB_INIT_FUNCTION (gre_interface_init); + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ diff --git a/src/plugins/gre/node.c b/src/plugins/gre/node.c new file mode 100644 index 00000000000..7ee22c3cb11 --- /dev/null +++ b/src/plugins/gre/node.c @@ -0,0 +1,576 @@ +/* + * node.c: gre packet processing + * + * Copyright (c) 2012 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. + */ + +#include <vlib/vlib.h> +#include <vnet/pg/pg.h> +#include <gre/gre.h> +#include <vnet/mpls/mpls.h> +#include <vppinfra/sparse_vec.h> + +#define foreach_gre_input_next \ + _ (PUNT, "error-punt") \ + _ (DROP, "error-drop") \ + _ (ETHERNET_INPUT, "ethernet-input") \ + _ (IP4_INPUT, "ip4-input") \ + _ (IP6_INPUT, "ip6-input") \ + _ (MPLS_INPUT, "mpls-input") + +typedef enum +{ +#define _(s, n) GRE_INPUT_NEXT_##s, + foreach_gre_input_next +#undef _ + GRE_INPUT_N_NEXT, +} gre_input_next_t; + +typedef struct +{ + u32 tunnel_id; + u32 length; + ip46_address_t src; + ip46_address_t dst; +} gre_rx_trace_t; + +extern u8 *format_gre_rx_trace (u8 *s, va_list *args); + +#ifndef CLIB_MARCH_VARIANT +u8 * +format_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 *); + gre_rx_trace_t *t = va_arg (*args, 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_ip46_address, &t->src, + IP46_TYPE_ANY, format_ip46_address, &t->dst, IP46_TYPE_ANY); + return s; +} +#endif /* CLIB_MARCH_VARIANT */ + +typedef struct +{ + /* Sparse vector mapping gre protocol in network byte order + to next index. */ + u16 *next_by_protocol; +} gre_input_runtime_t; + +always_inline void +gre_trace (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_buffer_t *b, + u32 tun_sw_if_index, const ip6_header_t *ip6, + const ip4_header_t *ip4, int is_ipv6) +{ + gre_rx_trace_t *tr = vlib_add_trace (vm, node, b, sizeof (*tr)); + tr->tunnel_id = tun_sw_if_index; + if (is_ipv6) + { + tr->length = ip6->payload_length; + tr->src.ip6.as_u64[0] = ip6->src_address.as_u64[0]; + tr->src.ip6.as_u64[1] = ip6->src_address.as_u64[1]; + tr->dst.ip6.as_u64[0] = ip6->dst_address.as_u64[0]; + tr->dst.ip6.as_u64[1] = ip6->dst_address.as_u64[1]; + } + else + { + tr->length = ip4->length; + tr->src.as_u64[0] = tr->src.as_u64[1] = 0; + tr->dst.as_u64[0] = tr->dst.as_u64[1] = 0; + tr->src.ip4.as_u32 = ip4->src_address.as_u32; + tr->dst.ip4.as_u32 = ip4->dst_address.as_u32; + } +} + +always_inline void +gre_tunnel_get (const gre_main_t *gm, vlib_node_runtime_t *node, + vlib_buffer_t *b, u16 *next, const gre_tunnel_key_t *key, + gre_tunnel_key_t *cached_key, u32 *tun_sw_if_index, + u32 *cached_tun_sw_if_index, int is_ipv6) +{ + const uword *p; + p = is_ipv6 ? hash_get_mem (gm->tunnel_by_key6, &key->gtk_v6) : + hash_get_mem (gm->tunnel_by_key4, &key->gtk_v4); + if (PREDICT_FALSE (!p)) + { + *next = GRE_INPUT_NEXT_DROP; + b->error = node->errors[GRE_ERROR_NO_SUCH_TUNNEL]; + *tun_sw_if_index = ~0; + } + else + { + const gre_tunnel_t *tun; + tun = pool_elt_at_index (gm->tunnels, *p); + *cached_tun_sw_if_index = *tun_sw_if_index = tun->sw_if_index; + if (is_ipv6) + cached_key->gtk_v6 = key->gtk_v6; + else + cached_key->gtk_v4 = key->gtk_v4; + } +} + +always_inline uword +gre_input (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame, + const int is_ipv6) +{ + gre_main_t *gm = &gre_main; + u32 *from, n_left_from; + vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs; + u16 nexts[VLIB_FRAME_SIZE], *next = nexts; + u16 cached_protocol = ~0; + u32 cached_next_index = SPARSE_VEC_INVALID_INDEX; + u32 cached_tun_sw_if_index = ~0; + gre_tunnel_key_t cached_key; + + from = vlib_frame_vector_args (frame); + n_left_from = frame->n_vectors; + vlib_get_buffers (vm, from, bufs, n_left_from); + + if (is_ipv6) + clib_memset (&cached_key.gtk_v6, 0xff, sizeof (cached_key.gtk_v6)); + else + clib_memset (&cached_key.gtk_v4, 0xff, sizeof (cached_key.gtk_v4)); + + while (n_left_from >= 2) + { + const ip6_header_t *ip6[2]; + const ip4_header_t *ip4[2]; + const gre_header_t *gre[2]; + u32 nidx[2]; + next_info_t ni[2]; + u8 type[2]; + u16 version[2]; + u32 len[2]; + gre_tunnel_key_t key[2]; + u8 matched[2]; + u32 tun_sw_if_index[2]; + + if (PREDICT_TRUE (n_left_from >= 6)) + { + vlib_prefetch_buffer_data (b[2], LOAD); + vlib_prefetch_buffer_data (b[3], LOAD); + vlib_prefetch_buffer_header (b[4], STORE); + vlib_prefetch_buffer_header (b[5], STORE); + } + + if (is_ipv6) + { + /* ip6_local hands us the ip header, not the gre header */ + ip6[0] = vlib_buffer_get_current (b[0]); + ip6[1] = vlib_buffer_get_current (b[1]); + gre[0] = (void *) (ip6[0] + 1); + gre[1] = (void *) (ip6[1] + 1); + vlib_buffer_advance (b[0], sizeof (*ip6[0]) + sizeof (*gre[0])); + vlib_buffer_advance (b[1], sizeof (*ip6[0]) + sizeof (*gre[0])); + } + else + { + /* ip4_local hands us the ip header, not the gre header */ + ip4[0] = vlib_buffer_get_current (b[0]); + ip4[1] = vlib_buffer_get_current (b[1]); + gre[0] = (void *) (ip4[0] + 1); + gre[1] = (void *) (ip4[1] + 1); + vlib_buffer_advance (b[0], sizeof (*ip4[0]) + sizeof (*gre[0])); + vlib_buffer_advance (b[1], sizeof (*ip4[0]) + sizeof (*gre[0])); + } + + if (PREDICT_TRUE (cached_protocol == gre[0]->protocol)) + { + nidx[0] = cached_next_index; + } + else + { + cached_next_index = nidx[0] = + sparse_vec_index (gm->next_by_protocol, gre[0]->protocol); + cached_protocol = gre[0]->protocol; + } + if (PREDICT_TRUE (cached_protocol == gre[1]->protocol)) + { + nidx[1] = cached_next_index; + } + else + { + cached_next_index = nidx[1] = + sparse_vec_index (gm->next_by_protocol, gre[1]->protocol); + cached_protocol = gre[1]->protocol; + } + + ni[0] = vec_elt (gm->next_by_protocol, nidx[0]); + ni[1] = vec_elt (gm->next_by_protocol, nidx[1]); + next[0] = ni[0].next_index; + next[1] = ni[1].next_index; + type[0] = ni[0].tunnel_type; + type[1] = ni[1].tunnel_type; + + b[0]->error = nidx[0] == SPARSE_VEC_INVALID_INDEX ? + node->errors[GRE_ERROR_UNKNOWN_PROTOCOL] : + node->errors[GRE_ERROR_NONE]; + b[1]->error = nidx[1] == SPARSE_VEC_INVALID_INDEX ? + node->errors[GRE_ERROR_UNKNOWN_PROTOCOL] : + node->errors[GRE_ERROR_NONE]; + + version[0] = clib_net_to_host_u16 (gre[0]->flags_and_version); + version[1] = clib_net_to_host_u16 (gre[1]->flags_and_version); + version[0] &= GRE_VERSION_MASK; + version[1] &= GRE_VERSION_MASK; + + b[0]->error = + version[0] ? node->errors[GRE_ERROR_UNSUPPORTED_VERSION] : b[0]->error; + next[0] = version[0] ? GRE_INPUT_NEXT_DROP : next[0]; + b[1]->error = + version[1] ? node->errors[GRE_ERROR_UNSUPPORTED_VERSION] : b[1]->error; + next[1] = version[1] ? GRE_INPUT_NEXT_DROP : next[1]; + + len[0] = vlib_buffer_length_in_chain (vm, b[0]); + len[1] = vlib_buffer_length_in_chain (vm, b[1]); + + /* always search for P2P types in the DP */ + if (is_ipv6) + { + gre_mk_key6 (&ip6[0]->dst_address, &ip6[0]->src_address, + vnet_buffer (b[0])->ip.fib_index, type[0], + TUNNEL_MODE_P2P, 0, &key[0].gtk_v6); + gre_mk_key6 (&ip6[1]->dst_address, &ip6[1]->src_address, + vnet_buffer (b[1])->ip.fib_index, type[1], + TUNNEL_MODE_P2P, 0, &key[1].gtk_v6); + matched[0] = gre_match_key6 (&cached_key.gtk_v6, &key[0].gtk_v6); + matched[1] = gre_match_key6 (&cached_key.gtk_v6, &key[1].gtk_v6); + } + else + { + gre_mk_key4 (ip4[0]->dst_address, ip4[0]->src_address, + vnet_buffer (b[0])->ip.fib_index, type[0], + TUNNEL_MODE_P2P, 0, &key[0].gtk_v4); + gre_mk_key4 (ip4[1]->dst_address, ip4[1]->src_address, + vnet_buffer (b[1])->ip.fib_index, type[1], + TUNNEL_MODE_P2P, 0, &key[1].gtk_v4); + matched[0] = gre_match_key4 (&cached_key.gtk_v4, &key[0].gtk_v4); + matched[1] = gre_match_key4 (&cached_key.gtk_v4, &key[1].gtk_v4); + } + + tun_sw_if_index[0] = cached_tun_sw_if_index; + tun_sw_if_index[1] = cached_tun_sw_if_index; + if (PREDICT_FALSE (!matched[0])) + gre_tunnel_get (gm, node, b[0], &next[0], &key[0], &cached_key, + &tun_sw_if_index[0], &cached_tun_sw_if_index, is_ipv6); + if (PREDICT_FALSE (!matched[1])) + gre_tunnel_get (gm, node, b[1], &next[1], &key[1], &cached_key, + &tun_sw_if_index[1], &cached_tun_sw_if_index, is_ipv6); + + if (PREDICT_TRUE (next[0] > GRE_INPUT_NEXT_DROP)) + { + vlib_increment_combined_counter ( + &gm->vnet_main->interface_main + .combined_sw_if_counters[VNET_INTERFACE_COUNTER_RX], + vm->thread_index, tun_sw_if_index[0], 1 /* packets */, + len[0] /* bytes */); + vnet_buffer (b[0])->sw_if_index[VLIB_RX] = tun_sw_if_index[0]; + } + if (PREDICT_TRUE (next[1] > GRE_INPUT_NEXT_DROP)) + { + vlib_increment_combined_counter ( + &gm->vnet_main->interface_main + .combined_sw_if_counters[VNET_INTERFACE_COUNTER_RX], + vm->thread_index, tun_sw_if_index[1], 1 /* packets */, + len[1] /* bytes */); + vnet_buffer (b[1])->sw_if_index[VLIB_RX] = tun_sw_if_index[1]; + } + + vnet_buffer (b[0])->sw_if_index[VLIB_TX] = (u32) ~0; + vnet_buffer (b[1])->sw_if_index[VLIB_TX] = (u32) ~0; + + if (PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED)) + gre_trace (vm, node, b[0], tun_sw_if_index[0], ip6[0], ip4[0], + is_ipv6); + if (PREDICT_FALSE (b[1]->flags & VLIB_BUFFER_IS_TRACED)) + gre_trace (vm, node, b[1], tun_sw_if_index[1], ip6[1], ip4[1], + is_ipv6); + + b += 2; + next += 2; + n_left_from -= 2; + } + + while (n_left_from >= 1) + { + const ip6_header_t *ip6[1]; + const ip4_header_t *ip4[1]; + const gre_header_t *gre[1]; + u32 nidx[1]; + next_info_t ni[1]; + u8 type[1]; + u16 version[1]; + u32 len[1]; + gre_tunnel_key_t key[1]; + u8 matched[1]; + u32 tun_sw_if_index[1]; + + if (PREDICT_TRUE (n_left_from >= 3)) + { + vlib_prefetch_buffer_data (b[1], LOAD); + vlib_prefetch_buffer_header (b[2], STORE); + } + + if (is_ipv6) + { + /* ip6_local hands us the ip header, not the gre header */ + ip6[0] = vlib_buffer_get_current (b[0]); + gre[0] = (void *) (ip6[0] + 1); + vlib_buffer_advance (b[0], sizeof (*ip6[0]) + sizeof (*gre[0])); + } + else + { + /* ip4_local hands us the ip header, not the gre header */ + ip4[0] = vlib_buffer_get_current (b[0]); + gre[0] = (void *) (ip4[0] + 1); + vlib_buffer_advance (b[0], sizeof (*ip4[0]) + sizeof (*gre[0])); + } + + if (PREDICT_TRUE (cached_protocol == gre[0]->protocol)) + { + nidx[0] = cached_next_index; + } + else + { + cached_next_index = nidx[0] = + sparse_vec_index (gm->next_by_protocol, gre[0]->protocol); + cached_protocol = gre[0]->protocol; + } + + ni[0] = vec_elt (gm->next_by_protocol, nidx[0]); + next[0] = ni[0].next_index; + type[0] = ni[0].tunnel_type; + + b[0]->error = nidx[0] == SPARSE_VEC_INVALID_INDEX ? + node->errors[GRE_ERROR_UNKNOWN_PROTOCOL] : + node->errors[GRE_ERROR_NONE]; + + version[0] = clib_net_to_host_u16 (gre[0]->flags_and_version); + version[0] &= GRE_VERSION_MASK; + + b[0]->error = + version[0] ? node->errors[GRE_ERROR_UNSUPPORTED_VERSION] : b[0]->error; + next[0] = version[0] ? GRE_INPUT_NEXT_DROP : next[0]; + + len[0] = vlib_buffer_length_in_chain (vm, b[0]); + + if (is_ipv6) + { + gre_mk_key6 (&ip6[0]->dst_address, &ip6[0]->src_address, + vnet_buffer (b[0])->ip.fib_index, type[0], + TUNNEL_MODE_P2P, 0, &key[0].gtk_v6); + matched[0] = gre_match_key6 (&cached_key.gtk_v6, &key[0].gtk_v6); + } + else + { + gre_mk_key4 (ip4[0]->dst_address, ip4[0]->src_address, + vnet_buffer (b[0])->ip.fib_index, type[0], + TUNNEL_MODE_P2P, 0, &key[0].gtk_v4); + matched[0] = gre_match_key4 (&cached_key.gtk_v4, &key[0].gtk_v4); + } + + tun_sw_if_index[0] = cached_tun_sw_if_index; + if (PREDICT_FALSE (!matched[0])) + gre_tunnel_get (gm, node, b[0], &next[0], &key[0], &cached_key, + &tun_sw_if_index[0], &cached_tun_sw_if_index, is_ipv6); + + if (PREDICT_TRUE (next[0] > GRE_INPUT_NEXT_DROP)) + { + vlib_increment_combined_counter ( + &gm->vnet_main->interface_main + .combined_sw_if_counters[VNET_INTERFACE_COUNTER_RX], + vm->thread_index, tun_sw_if_index[0], 1 /* packets */, + len[0] /* bytes */); + vnet_buffer (b[0])->sw_if_index[VLIB_RX] = tun_sw_if_index[0]; + } + + vnet_buffer (b[0])->sw_if_index[VLIB_TX] = (u32) ~0; + + if (PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED)) + gre_trace (vm, node, b[0], tun_sw_if_index[0], ip6[0], ip4[0], + is_ipv6); + + b += 1; + next += 1; + n_left_from -= 1; + } + + vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors); + + vlib_node_increment_counter ( + vm, is_ipv6 ? gre6_input_node.index : gre4_input_node.index, + GRE_ERROR_PKTS_DECAP, n_left_from); + + return frame->n_vectors; +} + +VLIB_NODE_FN (gre4_input_node) +(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame) +{ + return gre_input (vm, node, from_frame, /* is_ip6 */ 0); +} + +VLIB_NODE_FN (gre6_input_node) +(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame) +{ + return gre_input (vm, node, from_frame, /* is_ip6 */ 1); +} + +static char *gre_error_strings[] = { +#define gre_error(n, s) s, +#include "error.def" +#undef gre_error +}; + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (gre4_input_node) = { + .name = "gre4-input", + /* Takes a vector of packets. */ + .vector_size = sizeof (u32), + + .n_errors = GRE_N_ERROR, + .error_strings = gre_error_strings, + + .n_next_nodes = GRE_INPUT_N_NEXT, + .next_nodes = { +#define _(s, n) [GRE_INPUT_NEXT_##s] = n, + foreach_gre_input_next +#undef _ + }, + + .format_buffer = format_gre_header_with_length, + .format_trace = format_gre_rx_trace, + .unformat_buffer = unformat_gre_header, +}; + +VLIB_REGISTER_NODE (gre6_input_node) = { + .name = "gre6-input", + /* Takes a vector of packets. */ + .vector_size = sizeof (u32), + + .runtime_data_bytes = sizeof (gre_input_runtime_t), + + .n_errors = GRE_N_ERROR, + .error_strings = gre_error_strings, + + .n_next_nodes = GRE_INPUT_N_NEXT, + .next_nodes = { +#define _(s, n) [GRE_INPUT_NEXT_##s] = n, + foreach_gre_input_next +#undef _ + }, + + .format_buffer = format_gre_header_with_length, + .format_trace = format_gre_rx_trace, + .unformat_buffer = unformat_gre_header, +}; +/* *INDENT-ON* */ + +#ifndef CLIB_MARCH_VARIANT +void +gre_register_input_protocol (vlib_main_t *vm, gre_protocol_t protocol, + u32 node_index, gre_tunnel_type_t tunnel_type) +{ + gre_main_t *em = &gre_main; + gre_protocol_info_t *pi; + next_info_t *n; + u32 i; + + { + clib_error_t *error = vlib_call_init_function (vm, gre_input_init); + if (error) + clib_error_report (error); + } + + pi = gre_get_protocol_info (em, protocol); + pi->node_index = node_index; + pi->tunnel_type = tunnel_type; + pi->next_index = vlib_node_add_next (vm, gre4_input_node.index, node_index); + i = vlib_node_add_next (vm, gre6_input_node.index, node_index); + ASSERT (i == pi->next_index); + + /* Setup gre protocol -> next index sparse vector mapping. */ + n = sparse_vec_validate (em->next_by_protocol, + clib_host_to_net_u16 (protocol)); + n->next_index = pi->next_index; + n->tunnel_type = tunnel_type; +} + +static void +gre_setup_node (vlib_main_t *vm, u32 node_index) +{ + vlib_node_t *n = vlib_get_node (vm, node_index); + pg_node_t *pn = pg_get_node (node_index); + + n->format_buffer = format_gre_header_with_length; + n->unformat_buffer = unformat_gre_header; + pn->unformat_edit = unformat_pg_gre_header; +} + +static clib_error_t * +gre_input_init (vlib_main_t *vm) +{ + gre_main_t *gm = &gre_main; + vlib_node_t *ethernet_input, *ip4_input, *ip6_input, *mpls_unicast_input; + + { + clib_error_t *error; + error = vlib_call_init_function (vm, gre_init); + if (error) + clib_error_report (error); + } + + gre_setup_node (vm, gre4_input_node.index); + gre_setup_node (vm, gre6_input_node.index); + + gm->next_by_protocol = + sparse_vec_new (/* elt bytes */ sizeof (gm->next_by_protocol[0]), + /* bits in index */ BITS (((gre_header_t *) 0)->protocol)); + + /* These could be moved to the supported protocol input node defn's */ + ethernet_input = vlib_get_node_by_name (vm, (u8 *) "ethernet-input"); + ASSERT (ethernet_input); + ip4_input = vlib_get_node_by_name (vm, (u8 *) "ip4-input"); + ASSERT (ip4_input); + ip6_input = vlib_get_node_by_name (vm, (u8 *) "ip6-input"); + ASSERT (ip6_input); + mpls_unicast_input = vlib_get_node_by_name (vm, (u8 *) "mpls-input"); + ASSERT (mpls_unicast_input); + + gre_register_input_protocol (vm, GRE_PROTOCOL_teb, ethernet_input->index, + GRE_TUNNEL_TYPE_TEB); + + gre_register_input_protocol (vm, GRE_PROTOCOL_ip4, ip4_input->index, + GRE_TUNNEL_TYPE_L3); + + gre_register_input_protocol (vm, GRE_PROTOCOL_ip6, ip6_input->index, + GRE_TUNNEL_TYPE_L3); + + gre_register_input_protocol (vm, GRE_PROTOCOL_mpls_unicast, + mpls_unicast_input->index, GRE_TUNNEL_TYPE_L3); + + return 0; +} + +VLIB_INIT_FUNCTION (gre_input_init); + +#endif /* CLIB_MARCH_VARIANT */ +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ diff --git a/src/plugins/gre/pg.c b/src/plugins/gre/pg.c new file mode 100644 index 00000000000..91c9e487899 --- /dev/null +++ b/src/plugins/gre/pg.c @@ -0,0 +1,84 @@ +/* + * hdlc_pg.c: packet generator gre interface + * + * Copyright (c) 2012 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. + */ + +#include <vlib/vlib.h> +#include <vnet/pg/pg.h> +#include <gre/gre.h> + +typedef struct +{ + pg_edit_t flags_and_version; + pg_edit_t protocol; +} pg_gre_header_t; + +static inline void +pg_gre_header_init (pg_gre_header_t *e) +{ + pg_edit_init (&e->flags_and_version, gre_header_t, flags_and_version); + pg_edit_init (&e->protocol, gre_header_t, protocol); +} + +uword +unformat_pg_gre_header (unformat_input_t *input, va_list *args) +{ + pg_stream_t *s = va_arg (*args, pg_stream_t *); + pg_gre_header_t *h; + u32 group_index, error; + + h = pg_create_edit_group (s, sizeof (h[0]), sizeof (gre_header_t), + &group_index); + pg_gre_header_init (h); + + pg_edit_set_fixed (&h->flags_and_version, 0); + + error = 1; + if (!unformat (input, "%U", unformat_pg_edit, + unformat_gre_protocol_net_byte_order, &h->protocol)) + goto done; + + { + gre_main_t *pm = &gre_main; + gre_protocol_info_t *pi = 0; + pg_node_t *pg_node = 0; + + if (h->protocol.type == PG_EDIT_FIXED) + { + u16 t = *(u16 *) h->protocol.values[PG_EDIT_LO]; + pi = gre_get_protocol_info (pm, clib_net_to_host_u16 (t)); + if (pi && pi->node_index != ~0) + pg_node = pg_get_node (pi->node_index); + } + + if (pg_node && pg_node->unformat_edit && + unformat_user (input, pg_node->unformat_edit, s)) + ; + } + + error = 0; +done: + if (error) + pg_free_edit_group (s); + return error == 0; +} + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ diff --git a/src/plugins/gre/plugin.c b/src/plugins/gre/plugin.c new file mode 100644 index 00000000000..b92ec0b6dcd --- /dev/null +++ b/src/plugins/gre/plugin.c @@ -0,0 +1,26 @@ +/* + * plugin.c: gre + * + * Copyright (c) 2023 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. + */ + +#include <vlib/vlib.h> +#include <vnet/plugin/plugin.h> +#include <vpp/app/version.h> + +// register a plugin +VLIB_PLUGIN_REGISTER () = { + .version = VPP_BUILD_VER, + .description = "Generic Routing Encapsulation (GRE) plugin", +}; |