diff options
Diffstat (limited to 'vnet/vnet/gre')
| -rw-r--r-- | vnet/vnet/gre/error.def | 23 | ||||
| -rw-r--r-- | vnet/vnet/gre/gre.c | 512 | ||||
| -rw-r--r-- | vnet/vnet/gre/gre.h | 118 | ||||
| -rw-r--r-- | vnet/vnet/gre/interface.c | 150 | ||||
| -rw-r--r-- | vnet/vnet/gre/node.c | 533 | ||||
| -rw-r--r-- | vnet/vnet/gre/packet.h | 54 | ||||
| -rw-r--r-- | vnet/vnet/gre/pg.c | 77 |
7 files changed, 1467 insertions, 0 deletions
diff --git a/vnet/vnet/gre/error.def b/vnet/vnet/gre/error.def new file mode 100644 index 00000000000..161ecc1d874 --- /dev/null +++ b/vnet/vnet/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/vnet/vnet/gre/gre.c b/vnet/vnet/gre/gre.c new file mode 100644 index 00000000000..c09816a2962 --- /dev/null +++ b/vnet/vnet/gre/gre.c @@ -0,0 +1,512 @@ +/* + * 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 <vnet/gre/gre.h> + +gre_main_t gre_main; + +typedef CLIB_PACKED (struct { + ip4_header_t ip4; + gre_header_t gre; +}) ip4_and_gre_header_t; + +typedef struct { + union { + ip4_and_gre_header_t ip4_and_gre; + u64 as_u64[3]; + }; +} ip4_and_gre_union_t; + + +/* Packet trace structure */ +typedef struct { + /* Tunnel-id / index in tunnel vector */ + u32 tunnel_id; + + /* pkt length */ + u32 length; + + /* tunnel ip4 addresses */ + ip4_address_t src; + ip4_address_t dst; +} gre_tx_trace_t; + +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, clib_net_to_host_u16 (t->length), + format_ip4_address, &t->src.as_u8, + format_ip4_address, &t->dst.as_u8); + 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); + uword 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); + memcpy (p, h, n_bytes); + } + + return 1; +} + +static uword gre_set_rewrite (vnet_main_t * vnm, + u32 sw_if_index, + u32 l3_type, + void * dst_address, + void * rewrite, + uword max_rewrite_bytes) +{ + /* + * Conundrum: packets from tun/tap destined for the tunnel + * actually have this rewrite applied. Transit packets do not. + * To make the two cases equivalent, don't generate a + * rewrite here, build the entire header in the fast path. + */ + return 0; + +#ifdef THINGS_WORKED_AS_ONE_MIGHT_LIKE + ip4_and_gre_header_t * h = rewrite; + gre_protocol_t protocol; + + if (max_rewrite_bytes < sizeof (h[0])) + return 0; + + switch (l3_type) { +#define _(a,b) case VNET_L3_PACKET_TYPE_##a: protocol = GRE_PROTOCOL_##b; break + _ (IP4, ip4); + _ (IP6, ip6); +#undef _ + default: + return 0; + } + + memset (h, 0, sizeof (*h)); + h->ip4.ip_version_and_header_length = 0x45; + h->ip4.ttl = 64; + h->ip4.protocol = IP_PROTOCOL_GRE; + h->gre.protocol = clib_host_to_net_u16 (protocol); + + return sizeof (h[0]); +#endif +} + +static uword +gre_interface_tx (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + gre_main_t * gm = &gre_main; + u32 next_index; + u32 * from, * to_next, n_left_from, n_left_to_next; + vnet_interface_output_runtime_t * rd = (void *) node->runtime_data; + gre_tunnel_t *t = pool_elt_at_index (gm->tunnels, rd->dev_instance); + + /* Vector of buffer / pkt indices we're supposed to process */ + from = vlib_frame_vector_args (frame); + + /* Number of buffers / pkts */ + n_left_from = frame->n_vectors; + + /* Speculatively send the first buffer to the last disposition we used */ + next_index = node->cached_next_index; + + while (n_left_from > 0) + { + /* set up to enqueue to our disposition with index = next_index */ + vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); + + /* + * As long as we have enough pkts left to process two pkts + * and prefetch two pkts... + */ + while (n_left_from >= 4 && n_left_to_next >= 2) + { + vlib_buffer_t * b0, * b1; + ip4_header_t * ip0, * ip1; + ip4_and_gre_union_t * h0, * h1; + u32 bi0, next0, bi1, next1; + __attribute__((unused)) u8 error0, error1; + u16 gre_protocol0, gre_protocol1; + + /* Prefetch the 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); + + /* + * Prefetch packet data. We expect to overwrite + * the inbound L2 header with an ip header and a + * gre header. Might want to prefetch the last line + * of rewrite space as well; need profile data + */ + CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE); + CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE); + } + + /* Pick up the next two buffer indices */ + bi0 = from[0]; + bi1 = from[1]; + + /* Speculatively enqueue them where we sent the last buffer */ + 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); + + vnet_buffer (b0)->sw_if_index[VLIB_TX] = t->outer_fib_index; + vnet_buffer (b1)->sw_if_index[VLIB_TX] = t->outer_fib_index; + + ip0 = vlib_buffer_get_current (b0); + gre_protocol0 = clib_net_to_host_u16 (0x800); + gre_protocol0 = + ((ip0->ip_version_and_header_length & 0xF0) == 0x60) ? + 0x86DD : gre_protocol0; + + ip1 = vlib_buffer_get_current (b1); + gre_protocol1 = clib_net_to_host_u16 (0x800); + gre_protocol1 = + ((ip1->ip_version_and_header_length & 0xF0) == 0x60) ? + 0x86DD : gre_protocol1; + + vlib_buffer_advance (b0, -sizeof(*h0)); + vlib_buffer_advance (b1, -sizeof(*h1)); + + h0 = vlib_buffer_get_current (b0); + h1 = vlib_buffer_get_current (b1); + h0->as_u64[0] = 0; + h0->as_u64[1] = 0; + h0->as_u64[2] = 0; + + h1->as_u64[0] = 0; + h1->as_u64[1] = 0; + h1->as_u64[2] = 0; + + ip0 = &h0->ip4_and_gre.ip4; + h0->ip4_and_gre.gre.protocol = gre_protocol0; + ip0->ip_version_and_header_length = 0x45; + ip0->ttl = 254; + ip0->protocol = IP_PROTOCOL_GRE; + + ip1 = &h1->ip4_and_gre.ip4; + h1->ip4_and_gre.gre.protocol = gre_protocol1; + ip1->ip_version_and_header_length = 0x45; + ip1->ttl = 254; + ip1->protocol = IP_PROTOCOL_GRE; + + ip0->length = + clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0)); + ip1->length = + clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b1)); + ip0->src_address.as_u32 = t->tunnel_src.as_u32; + ip1->src_address.as_u32 = t->tunnel_src.as_u32; + ip0->dst_address.as_u32 = t->tunnel_dst.as_u32; + ip1->dst_address.as_u32 = t->tunnel_dst.as_u32; + ip0->checksum = ip4_header_checksum (ip0); + ip1->checksum = ip4_header_checksum (ip1); + + /* ip4_lookup will route to the tunnel partner */ + next0 = GRE_OUTPUT_NEXT_LOOKUP; + next1 = GRE_OUTPUT_NEXT_LOOKUP; + error0 = GRE_ERROR_NONE; + error1 = GRE_ERROR_NONE; + + /* + * Enqueue 2 pkts. This macro deals with next0 != next1, + * acquiring enqueue rights to the indicated next + * node input frame, etc. + */ + vlib_validate_buffer_enqueue_x2 (vm, node, next_index, + to_next, n_left_to_next, + bi0, bi1, next0, next1); + } + + while (n_left_from > 0 && n_left_to_next > 0) + { + vlib_buffer_t * b0; + ip4_header_t * ip0; + ip4_and_gre_union_t * h0; + u32 bi0, next0; + __attribute__((unused)) u8 error0; + u16 gre_protocol0; + + bi0 = to_next[0] = from[0]; + from += 1; + n_left_from -= 1; + to_next += 1; + n_left_to_next -= 1; + + b0 = vlib_get_buffer (vm, bi0); + + vnet_buffer (b0)->sw_if_index[VLIB_TX] = t->outer_fib_index; + ip0 = vlib_buffer_get_current (b0); + gre_protocol0 = clib_net_to_host_u16 (0x800); + gre_protocol0 = + ((ip0->ip_version_and_header_length & 0xF0) == 0x60) ? + 0x86DD : gre_protocol0; + + vlib_buffer_advance (b0, -sizeof(*h0)); + + h0 = vlib_buffer_get_current (b0); + h0->as_u64[0] = 0; + h0->as_u64[1] = 0; + h0->as_u64[2] = 0; + + ip0 = &h0->ip4_and_gre.ip4; + h0->ip4_and_gre.gre.protocol = gre_protocol0; + ip0->ip_version_and_header_length = 0x45; + ip0->ttl = 254; + ip0->protocol = IP_PROTOCOL_GRE; + ip0->length = + clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0)); + ip0->src_address.as_u32 = t->tunnel_src.as_u32; + ip0->dst_address.as_u32 = t->tunnel_dst.as_u32; + ip0->checksum = ip4_header_checksum (ip0); + + next0 = GRE_OUTPUT_NEXT_LOOKUP; + error0 = GRE_ERROR_NONE; + + if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) + { + gre_tx_trace_t *tr = vlib_add_trace (vm, node, + b0, sizeof (*tr)); + tr->tunnel_id = t - gm->tunnels; + tr->length = ip0->length; + tr->src.as_u32 = ip0->src_address.as_u32; + tr->dst.as_u32 = ip0->dst_address.as_u32; + } + + vlib_validate_buffer_enqueue_x1 (vm, node, next_index, + to_next, n_left_to_next, + bi0, next0); + } + + vlib_put_next_frame (vm, node, next_index, n_left_to_next); + } + + vlib_node_increment_counter (vm, gre_input_node.index, + GRE_ERROR_PKTS_ENCAP, frame->n_vectors); + + return frame->n_vectors; +} + +static u8 * format_gre_tunnel_name (u8 * s, va_list * args) +{ + u32 dev_instance = va_arg (*args, u32); + return format (s, "gre%d", dev_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; +} + +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, + .tx_function = gre_interface_tx, +#ifdef SOON + .clear counter = 0; + .admin_up_down_function = 0; +#endif +}; + + +VNET_HW_INTERFACE_CLASS (gre_hw_interface_class) = { + .name = "GRE", + .format_header = format_gre_header_with_length, + .unformat_header = unformat_gre_header, + .set_rewrite = gre_set_rewrite, +}; + +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; + + 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; + + /* 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_key = hash_create (0, 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); + +gre_main_t * gre_get_main (vlib_main_t * vm) +{ + vlib_call_init_function (vm, gre_init); + return &gre_main; +} + diff --git a/vnet/vnet/gre/gre.h b/vnet/vnet/gre/gre.h new file mode 100644 index 00000000000..c0689f60ddf --- /dev/null +++ b/vnet/vnet/gre/gre.h @@ -0,0 +1,118 @@ +/* + * 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/ip4.h> +#include <vnet/ip/ip4_packet.h> +#include <vnet/pg/pg.h> +#include <vnet/ip/format.h> + +vnet_hw_interface_class_t gre_hw_interface_class; + +typedef enum { +#define gre_error(n,s) GRE_ERROR_##n, +#include <vnet/gre/error.def> +#undef gre_error + GRE_N_ERROR, +} gre_error_t; + +typedef struct { + /* Name (a c string). */ + char * name; + + /* GRE protocol type in host byte order. */ + gre_protocol_t protocol; + + /* Node which handles this type. */ + u32 node_index; + + /* Next index for this type. */ + u32 next_index; +} gre_protocol_info_t; + +typedef struct { + ip4_address_t tunnel_src; + ip4_address_t tunnel_dst; + u32 outer_fib_index; + u32 hw_if_index; +} gre_tunnel_t; + +typedef struct { + /* pool of tunnel instances */ + gre_tunnel_t *tunnels; + + 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 src/dst addr pair to tunnel */ + uword * tunnel_by_key; + + /* convenience */ + vlib_main_t * vlib_main; + vnet_main_t * vnet_main; +} gre_main_t; + +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; +} + +gre_main_t gre_main; + +/* Register given node index to take input for given gre type. */ +void +gre_register_input_type (vlib_main_t * vm, + gre_protocol_t protocol, + u32 node_index); + +void gre_set_adjacency (vnet_rewrite_header_t * rw, + uword max_data_bytes, + gre_protocol_t protocol); + +format_function_t format_gre_protocol; +format_function_t format_gre_header; +format_function_t format_gre_header_with_length; + +vlib_node_registration_t gre_input_node; +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); + +/* manually added to the interface output node in gre.c */ +#define GRE_OUTPUT_NEXT_LOOKUP 1 + +#endif /* included_gre_h */ diff --git a/vnet/vnet/gre/interface.c b/vnet/vnet/gre/interface.c new file mode 100644 index 00000000000..72ce0962fc7 --- /dev/null +++ b/vnet/vnet/gre/interface.c @@ -0,0 +1,150 @@ +/* + * 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 <vnet/pg/pg.h> +#include <vnet/gre/gre.h> + +int +gre_register_interface (vnet_main_t * vnm, + u32 dev_class_index, + ip4_address_t *tunnel_src, + ip4_address_t *tunnel_dst, + u32 outer_fib_id, + u32 * gi_index_return) +{ + gre_main_t * gm = &gre_main; + ip4_main_t * im = &ip4_main; + gre_tunnel_t * t; + vnet_hw_interface_t * hi; + u32 hw_if_index; + u32 slot; + u32 outer_fib_index; + uword * p; + + u64 key = (u64)tunnel_src->as_u32 << 32 | (u64)tunnel_dst->as_u32; + + /* check if same src/dst pair exists */ + if (hash_get (gm->tunnel_by_key, key)) + return VNET_API_ERROR_INVALID_VALUE; + + p = hash_get (im->fib_index_by_table_id, outer_fib_id); + if (! p) + return VNET_API_ERROR_NO_SUCH_FIB; + + outer_fib_index = p[0]; + + pool_get (gm->tunnels, t); + memset (t, 0, sizeof (*t)); + + hw_if_index = vnet_register_interface + (vnm, gre_device_class.index, t - gm->tunnels, + gre_hw_interface_class.index, + t - gm->tunnels); + + *gi_index_return = t - gm->tunnels; + + t->hw_if_index = hw_if_index; + t->outer_fib_index = outer_fib_index; + + hi = vnet_get_hw_interface (vnm, hw_if_index); + + hi->min_packet_bytes = 64 + sizeof (gre_header_t) + sizeof (ip4_header_t); + hi->per_packet_overhead_bytes = + /* preamble */ 8 + /* inter frame gap */ 12; + + /* Standard default gre MTU. */ + hi->max_l3_packet_bytes[VLIB_RX] = hi->max_l3_packet_bytes[VLIB_TX] = 1500; + + memcpy (&t->tunnel_src, tunnel_src, sizeof (t->tunnel_src)); + memcpy (&t->tunnel_dst, tunnel_dst, sizeof (t->tunnel_dst)); + + hash_set (gm->tunnel_by_key, key, t - gm->tunnels); + + slot = vlib_node_add_named_next_with_slot + (vnm->vlib_main, hi->tx_node_index, "ip4-lookup", GRE_OUTPUT_NEXT_LOOKUP); + + ASSERT (slot == GRE_OUTPUT_NEXT_LOOKUP); + + return 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_main_t * vnm = vnet_get_main(); + ip4_address_t src, dst; + u32 outer_fib_id = 0; + int rv; + u32 gi_index; + u32 num_m_args = 0; + + /* 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, "src %U", unformat_ip4_address, &src)) + num_m_args++; + else if (unformat (line_input, "dst %U", unformat_ip4_address, &dst)) + num_m_args++; + else if (unformat (line_input, "outer-fib-id %d", &outer_fib_id)) + ; + else + return clib_error_return (0, "unknown input `%U'", + format_unformat_error, input); + } + unformat_free (line_input); + + if (num_m_args < 2) + return clib_error_return (0, "mandatory argument(s) missing"); + + rv = gre_register_interface (vnm, gre_hw_interface_class.index, + &src, &dst, outer_fib_id, &gi_index); + + switch(rv) + { + case 0: + break; + case VNET_API_ERROR_INVALID_VALUE: + return clib_error_return (0, "GRE tunnel already exists..."); + case VNET_API_ERROR_NO_SUCH_FIB: + return clib_error_return (0, "outer fib ID %d doesn't exist\n", + outer_fib_id); + default: + return clib_error_return (0, "gre_register_interface returned %d", rv); + } + + return 0; +} + +VLIB_CLI_COMMAND (create_gre_tunnel_command, static) = { + .path = "create gre tunnel", + .short_help = "create gre tunnel src <addr> dst <addr> [outer-fib-id <fib>]", + .function = create_gre_tunnel_command_fn, +}; + +/* force inclusion from application's main.c */ +clib_error_t *gre_interface_init (vlib_main_t *vm) +{ + return 0; +} +VLIB_INIT_FUNCTION(gre_interface_init); diff --git a/vnet/vnet/gre/node.c b/vnet/vnet/gre/node.c new file mode 100644 index 00000000000..7d07223fc71 --- /dev/null +++ b/vnet/vnet/gre/node.c @@ -0,0 +1,533 @@ +/* + * 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 <vnet/gre/gre.h> +#include <vppinfra/sparse_vec.h> + +#define foreach_gre_input_next \ +_(PUNT, "error-punt") \ +_(DROP, "error-drop") \ +_(IP4_INPUT, "ip4-input") \ +_(IP6_INPUT, "ip6-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; + ip4_address_t src; + ip4_address_t dst; +} gre_rx_trace_t; + +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_ip4_address, &t->src.as_u8, + format_ip4_address, &t->dst.as_u8); + return s; +} + +typedef struct { + /* Sparse vector mapping gre protocol in network byte order + to next index. */ + u16 * next_by_protocol; + + u32 * sparse_index_by_next_index; +} gre_input_runtime_t; + +static uword +gre_input (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * from_frame) +{ + gre_main_t * gm = &gre_main; + gre_input_runtime_t * rt = (void *) node->runtime_data; + __attribute__((unused)) u32 n_left_from, next_index, i_next, * from, * to_next; + u64 cached_tunnel_key = (u64) ~0; + u32 cached_tunnel_sw_if_index = 0, tunnel_sw_if_index; + u32 cached_tunnel_fib_index = 0, tunnel_fib_index; + + u32 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; + i_next = vec_elt (rt->sparse_index_by_next_index, next_index); + + while (n_left_from > 0) + { + u32 n_left_to_next; + + vlib_get_next_frame (vm, node, next_index, + to_next, n_left_to_next); + + while (n_left_from >= 4 && n_left_to_next >= 2) + { + u32 bi0, bi1; + vlib_buffer_t * b0, * b1; + gre_header_t * h0, * h1; + u16 version0, version1; + int verr0, verr1; + u32 i0, i1, next0, next1, protocol0, protocol1; + ip4_header_t *ip0, *ip1; + + /* Prefetch next iteration. */ + { + vlib_buffer_t * p2, * p3; + + p2 = vlib_get_buffer (vm, from[2]); + p3 = vlib_get_buffer (vm, from[3]); + + vlib_prefetch_buffer_header (p2, LOAD); + vlib_prefetch_buffer_header (p3, LOAD); + + CLIB_PREFETCH (p2->data, sizeof (h0[0]), LOAD); + CLIB_PREFETCH (p3->data, sizeof (h1[0]), LOAD); + } + + bi0 = from[0]; + bi1 = from[1]; + to_next[0] = bi0; + to_next[1] = bi1; + from += 2; + to_next += 2; + n_left_to_next -= 2; + n_left_from -= 2; + + b0 = vlib_get_buffer (vm, bi0); + b1 = vlib_get_buffer (vm, bi1); + + /* ip4_local hands us the ip header, not the gre header */ + ip0 = vlib_buffer_get_current (b0); + ip1 = vlib_buffer_get_current (b1); + + /* Save src + dst ip4 address, e.g. for mpls-o-gre */ + vnet_buffer(b0)->gre.src = ip0->src_address.as_u32; + vnet_buffer(b0)->gre.dst = ip0->dst_address.as_u32; + vnet_buffer(b1)->gre.src = ip1->src_address.as_u32; + vnet_buffer(b1)->gre.dst = ip1->dst_address.as_u32; + + vlib_buffer_advance (b0, sizeof (*ip0)); + vlib_buffer_advance (b1, sizeof (*ip1)); + + h0 = vlib_buffer_get_current (b0); + h1 = vlib_buffer_get_current (b1); + + /* Index sparse array with network byte order. */ + protocol0 = h0->protocol; + protocol1 = h1->protocol; + sparse_vec_index2 (rt->next_by_protocol, protocol0, protocol1, + &i0, &i1); + next0 = vec_elt(rt->next_by_protocol, i0); + next1 = vec_elt(rt->next_by_protocol, i1); + + b0->error = node->errors[next0 == SPARSE_VEC_INVALID_INDEX ? GRE_ERROR_UNKNOWN_PROTOCOL : GRE_ERROR_NONE]; + b1->error = node->errors[next1 == SPARSE_VEC_INVALID_INDEX ? GRE_ERROR_UNKNOWN_PROTOCOL : GRE_ERROR_NONE]; + + version0 = clib_net_to_host_u16 (h0->flags_and_version); + verr0 = version0 & GRE_VERSION_MASK; + version1 = clib_net_to_host_u16 (h1->flags_and_version); + verr1 = version1 & GRE_VERSION_MASK; + + b0->error = verr0 ? node->errors[GRE_ERROR_UNSUPPORTED_VERSION] + : b0->error; + next0 = verr0 ? GRE_INPUT_NEXT_DROP : next0; + b1->error = verr1 ? node->errors[GRE_ERROR_UNSUPPORTED_VERSION] + : b1->error; + next1 = verr1 ? GRE_INPUT_NEXT_DROP : next1; + + /* RPF check for ip4/ip6 input */ + if (PREDICT_FALSE(next0 == GRE_INPUT_NEXT_IP4_INPUT + || next0 == GRE_INPUT_NEXT_IP6_INPUT)) + { + u64 key = ((u64)(vnet_buffer(b0)->gre.dst) << 32) | + (u64)(vnet_buffer(b0)->gre.src); + + if (cached_tunnel_key != key) + { + vnet_hw_interface_t * hi; + gre_tunnel_t * t; + uword * p; + + ip4_main_t * ip4m = &ip4_main; + p = hash_get (gm->tunnel_by_key, key); + if (!p) + { + next0 = GRE_INPUT_NEXT_DROP; + b0->error = node->errors[GRE_ERROR_NO_SUCH_TUNNEL]; + goto drop0; + } + t = pool_elt_at_index (gm->tunnels, p[0]); + hi = vnet_get_hw_interface (gm->vnet_main, + t->hw_if_index); + tunnel_sw_if_index = hi->sw_if_index; + tunnel_fib_index = vec_elt (ip4m->fib_index_by_sw_if_index, + tunnel_sw_if_index); + + cached_tunnel_sw_if_index = tunnel_sw_if_index; + cached_tunnel_fib_index = tunnel_fib_index; + } + else + { + tunnel_sw_if_index = cached_tunnel_sw_if_index; + tunnel_fib_index = cached_tunnel_fib_index; + } + + u32 len = vlib_buffer_length_in_chain (vm, b0); + vnet_interface_main_t *im = &gm->vnet_main->interface_main; + vlib_increment_combined_counter (im->combined_sw_if_counters + + VNET_INTERFACE_COUNTER_RX, + cpu_index, + tunnel_sw_if_index, + 1 /* packets */, + len /* bytes */); + + vnet_buffer(b0)->sw_if_index[VLIB_TX] = tunnel_fib_index; + } + +drop0: + if (PREDICT_FALSE(next1 == GRE_INPUT_NEXT_IP4_INPUT + || next1 == GRE_INPUT_NEXT_IP6_INPUT)) + { + u64 key = ((u64)(vnet_buffer(b1)->gre.dst) << 32) | + (u64)(vnet_buffer(b1)->gre.src); + + if (cached_tunnel_key != key) + { + vnet_hw_interface_t * hi; + gre_tunnel_t * t; + uword * p; + + ip4_main_t * ip4m = &ip4_main; + p = hash_get (gm->tunnel_by_key, key); + if (!p) + { + next1 = GRE_INPUT_NEXT_DROP; + b1->error = node->errors[GRE_ERROR_NO_SUCH_TUNNEL]; + goto drop1; + } + t = pool_elt_at_index (gm->tunnels, p[0]); + hi = vnet_get_hw_interface (gm->vnet_main, + t->hw_if_index); + tunnel_sw_if_index = hi->sw_if_index; + tunnel_fib_index = vec_elt (ip4m->fib_index_by_sw_if_index, + tunnel_sw_if_index); + + cached_tunnel_sw_if_index = tunnel_sw_if_index; + cached_tunnel_fib_index = tunnel_fib_index; + } + else + { + tunnel_sw_if_index = cached_tunnel_sw_if_index; + tunnel_fib_index = cached_tunnel_fib_index; + } + + u32 len = vlib_buffer_length_in_chain (vm, b1); + vnet_interface_main_t *im = &gm->vnet_main->interface_main; + vlib_increment_combined_counter (im->combined_sw_if_counters + + VNET_INTERFACE_COUNTER_RX, + cpu_index, + tunnel_sw_if_index, + 1 /* packets */, + len /* bytes */); + + vnet_buffer(b1)->sw_if_index[VLIB_TX] = tunnel_fib_index; + } +drop1: + if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) + { + gre_rx_trace_t *tr = vlib_add_trace (vm, node, + b0, sizeof (*tr)); + tr->tunnel_id = ~0; + tr->length = ip0->length; + tr->src.as_u32 = ip0->src_address.as_u32; + tr->dst.as_u32 = ip0->dst_address.as_u32; + } + + if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED)) + { + gre_rx_trace_t *tr = vlib_add_trace (vm, node, + b1, sizeof (*tr)); + tr->tunnel_id = ~0; + tr->length = ip1->length; + tr->src.as_u32 = ip1->src_address.as_u32; + tr->dst.as_u32 = ip1->dst_address.as_u32; + } + + vlib_buffer_advance (b0, sizeof (*h0)); + vlib_buffer_advance (b1, sizeof (*h1)); + + vlib_validate_buffer_enqueue_x2 (vm, node, next_index, + to_next, n_left_to_next, + bi0, bi1, next0, next1); + } + + while (n_left_from > 0 && n_left_to_next > 0) + { + u32 bi0; + vlib_buffer_t * b0; + gre_header_t * h0; + ip4_header_t * ip0; + u16 version0; + int verr0; + u32 i0, next0; + + bi0 = from[0]; + to_next[0] = bi0; + from += 1; + to_next += 1; + n_left_from -= 1; + n_left_to_next -= 1; + + b0 = vlib_get_buffer (vm, bi0); + ip0 = vlib_buffer_get_current (b0); + + vnet_buffer(b0)->gre.src = ip0->src_address.as_u32; + vnet_buffer(b0)->gre.dst = ip0->dst_address.as_u32; + + vlib_buffer_advance (b0, sizeof (*ip0)); + + h0 = vlib_buffer_get_current (b0); + + i0 = sparse_vec_index (rt->next_by_protocol, h0->protocol); + next0 = vec_elt(rt->next_by_protocol, i0); + + b0->error = + node->errors[next0 == SPARSE_VEC_INVALID_INDEX + ? GRE_ERROR_UNKNOWN_PROTOCOL : GRE_ERROR_NONE]; + + version0 = clib_net_to_host_u16 (h0->flags_and_version); + verr0 = version0 & GRE_VERSION_MASK; + b0->error = verr0 ? node->errors[GRE_ERROR_UNSUPPORTED_VERSION] + : b0->error; + next0 = verr0 ? GRE_INPUT_NEXT_DROP : next0; + + /* For IP payload we need to find source interface + so we can increase counters and help forward node to + pick right FIB */ + if (PREDICT_FALSE(next0 == GRE_INPUT_NEXT_IP4_INPUT + || next0 == GRE_INPUT_NEXT_IP6_INPUT)) + { + u64 key = ((u64)(vnet_buffer(b0)->gre.dst) << 32) | + (u64)(vnet_buffer(b0)->gre.src); + + if (cached_tunnel_key != key) + { + vnet_hw_interface_t * hi; + gre_tunnel_t * t; + uword * p; + + ip4_main_t * ip4m = &ip4_main; + p = hash_get (gm->tunnel_by_key, key); + if (!p) + { + next0 = GRE_INPUT_NEXT_DROP; + b0->error = node->errors[GRE_ERROR_NO_SUCH_TUNNEL]; + goto drop; + } + t = pool_elt_at_index (gm->tunnels, p[0]); + hi = vnet_get_hw_interface (gm->vnet_main, + t->hw_if_index); + tunnel_sw_if_index = hi->sw_if_index; + tunnel_fib_index = vec_elt (ip4m->fib_index_by_sw_if_index, + tunnel_sw_if_index); + + cached_tunnel_sw_if_index = tunnel_sw_if_index; + cached_tunnel_fib_index = tunnel_fib_index; + } + else + { + tunnel_sw_if_index = cached_tunnel_sw_if_index; + tunnel_fib_index = cached_tunnel_fib_index; + } + + u32 len = vlib_buffer_length_in_chain (vm, b0); + vnet_interface_main_t *im = &gm->vnet_main->interface_main; + vlib_increment_combined_counter (im->combined_sw_if_counters + + VNET_INTERFACE_COUNTER_RX, + cpu_index, + tunnel_sw_if_index, + 1 /* packets */, + len /* bytes */); + + vnet_buffer(b0)->sw_if_index[VLIB_TX] = tunnel_fib_index; + } + +drop: + if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) + { + gre_rx_trace_t *tr = vlib_add_trace (vm, node, + b0, sizeof (*tr)); + tr->tunnel_id = ~0; + tr->length = ip0->length; + tr->src.as_u32 = ip0->src_address.as_u32; + tr->dst.as_u32 = ip0->dst_address.as_u32; + } + + vlib_buffer_advance (b0, sizeof (*h0)); + + vlib_validate_buffer_enqueue_x1 (vm, node, next_index, + to_next, n_left_to_next, + bi0, next0); + } + + vlib_put_next_frame (vm, node, next_index, n_left_to_next); + } + vlib_node_increment_counter (vm, gre_input_node.index, + GRE_ERROR_PKTS_DECAP, from_frame->n_vectors); + return from_frame->n_vectors; +} + +static char * gre_error_strings[] = { +#define gre_error(n,s) s, +#include "error.def" +#undef gre_error +}; + +VLIB_REGISTER_NODE (gre_input_node) = { + .function = gre_input, + .name = "gre-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, +}; + +void +gre_register_input_protocol (vlib_main_t * vm, + gre_protocol_t protocol, + u32 node_index) +{ + gre_main_t * em = &gre_main; + gre_protocol_info_t * pi; + gre_input_runtime_t * rt; + u16 * 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->next_index = vlib_node_add_next (vm, + gre_input_node.index, + node_index); + + /* Setup gre protocol -> next index sparse vector mapping. */ + rt = vlib_node_get_runtime_data (vm, gre_input_node.index); + n = sparse_vec_validate (rt->next_by_protocol, + clib_host_to_net_u16 (protocol)); + n[0] = pi->next_index; + + /* Rebuild next index -> sparse index inverse mapping when sparse vector + is updated. */ + vec_validate (rt->sparse_index_by_next_index, pi->next_index); + for (i = 1; i < vec_len (rt->next_by_protocol); i++) + rt->sparse_index_by_next_index[rt->next_by_protocol[i]] = i; +} + +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_input_runtime_t * rt; + vlib_node_t *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, gre_input_node.index); + + rt = vlib_node_get_runtime_data (vm, gre_input_node.index); + + rt->next_by_protocol = sparse_vec_new + (/* elt bytes */ sizeof (rt->next_by_protocol[0]), + /* bits in index */ BITS (((gre_header_t *) 0)->protocol)); + + vec_validate (rt->sparse_index_by_next_index, GRE_INPUT_NEXT_DROP); + vec_validate (rt->sparse_index_by_next_index, GRE_INPUT_NEXT_PUNT); + rt->sparse_index_by_next_index[GRE_INPUT_NEXT_DROP] + = SPARSE_VEC_INVALID_INDEX; + rt->sparse_index_by_next_index[GRE_INPUT_NEXT_PUNT] + = SPARSE_VEC_INVALID_INDEX; + + /* These could be moved to the supported protocol input node defn's */ + 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-gre-input"); + ASSERT(mpls_unicast_input); + + gre_register_input_protocol (vm, GRE_PROTOCOL_ip4, + ip4_input->index); + + gre_register_input_protocol (vm, GRE_PROTOCOL_ip6, + ip6_input->index); + + gre_register_input_protocol (vm, GRE_PROTOCOL_mpls_unicast, + mpls_unicast_input->index); + + ip4_register_protocol (IP_PROTOCOL_GRE, gre_input_node.index); + + return 0; +} + +VLIB_INIT_FUNCTION (gre_input_init); diff --git a/vnet/vnet/gre/packet.h b/vnet/vnet/gre/packet.h new file mode 100644 index 00000000000..573f2624bf8 --- /dev/null +++ b/vnet/vnet/gre/packet.h @@ -0,0 +1,54 @@ +#ifndef included_vnet_gre_packet_h +#define included_vnet_gre_packet_h + +/* + * GRE packet format + * + * 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. + */ + +#define foreach_gre_protocol \ +_ (0x0800, ip4) \ +_ (0x86DD, ip6) \ +_ (0x0806, arp) \ +_ (0x8847, mpls_unicast) \ +_ (0x894F, nsh) + +typedef enum { +#define _(n,f) GRE_PROTOCOL_##f = n, + foreach_gre_protocol +#undef _ +} gre_protocol_t; + +typedef struct { + /* flags and version */ + u16 flags_and_version; + /* unimplemented at the moment */ +#define GRE_FLAGS_CHECKSUM (1 << 15) + + /* deprecated, according to rfc2784 */ +#define GRE_FLAGS_ROUTING (1 << 14) +#define GRE_FLAGS_KEY (1 << 13) +#define GRE_FLAGS_SEQUENCE (1 << 12) +#define GRE_FLAGS_STRICT_SOURCE_ROUTE (1 << 11) + + /* version 1 is PPTP which we don't support */ +#define GRE_SUPPORTED_VERSION 0 +#define GRE_VERSION_MASK 0x7 + + /* 0x800 for ip4, etc. */ + u16 protocol; +} gre_header_t; + +#endif /* included_vnet_gre_packet_h */ diff --git a/vnet/vnet/gre/pg.c b/vnet/vnet/gre/pg.c new file mode 100644 index 00000000000..cc065d3b6b5 --- /dev/null +++ b/vnet/vnet/gre/pg.c @@ -0,0 +1,77 @@ +/* + * 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 <vnet/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; +} + |