diff options
Diffstat (limited to 'vnet/vnet/dpo/mpls_label_dpo.c')
| -rw-r--r-- | vnet/vnet/dpo/mpls_label_dpo.c | 263 |
1 files changed, 263 insertions, 0 deletions
diff --git a/vnet/vnet/dpo/mpls_label_dpo.c b/vnet/vnet/dpo/mpls_label_dpo.c new file mode 100644 index 00000000..0ec840ec --- /dev/null +++ b/vnet/vnet/dpo/mpls_label_dpo.c @@ -0,0 +1,263 @@ +/* + * 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/ip/ip.h> +#include <vnet/dpo/mpls_label_dpo.h> +#include <vnet/mpls/mpls.h> + +/* + * pool of all MPLS Label DPOs + */ +mpls_label_dpo_t *mpls_label_dpo_pool; + +static mpls_label_dpo_t * +mpls_label_dpo_alloc (void) +{ + mpls_label_dpo_t *mld; + + pool_get_aligned(mpls_label_dpo_pool, mld, CLIB_CACHE_LINE_BYTES); + memset(mld, 0, sizeof(*mld)); + + dpo_reset(&mld->mld_dpo); + + return (mld); +} + +static index_t +mpls_label_dpo_get_index (mpls_label_dpo_t *mld) +{ + return (mld - mpls_label_dpo_pool); +} + +index_t +mpls_label_dpo_create (mpls_label_t label, + mpls_eos_bit_t eos, + u8 ttl, + u8 exp, + const dpo_id_t *dpo) +{ + mpls_label_dpo_t *mld; + + mld = mpls_label_dpo_alloc(); + + vnet_mpls_uc_set_label(&mld->mld_hdr.label_exp_s_ttl, label); + vnet_mpls_uc_set_ttl(&mld->mld_hdr.label_exp_s_ttl, ttl); + vnet_mpls_uc_set_exp(&mld->mld_hdr.label_exp_s_ttl, exp); + vnet_mpls_uc_set_s(&mld->mld_hdr.label_exp_s_ttl, eos); + + /* + * get the header in network byte order since we will paint it + * on a packet in the data-plane + */ + mld->mld_hdr.label_exp_s_ttl = + clib_host_to_net_u32(mld->mld_hdr.label_exp_s_ttl); + + dpo_stack(DPO_MPLS_LABEL, DPO_PROTO_MPLS, &mld->mld_dpo, dpo); + + return (mpls_label_dpo_get_index(mld)); +} + +u8* +format_mpls_label_dpo (u8 *s, va_list *args) +{ + index_t index = va_arg (*args, index_t); + u32 indent = va_arg (*args, u32); + mpls_unicast_header_t hdr; + mpls_label_dpo_t *mld; + + mld = mpls_label_dpo_get(index); + + hdr.label_exp_s_ttl = + clib_net_to_host_u32(mld->mld_hdr.label_exp_s_ttl); + + return (format(s, "mpls-label:[%d]:%U\n%U%U", + index, + format_mpls_header, hdr, + format_white_space, indent, + format_dpo_id, &mld->mld_dpo, indent+2)); +} + +static void +mpls_label_dpo_lock (dpo_id_t *dpo) +{ + mpls_label_dpo_t *mld; + + mld = mpls_label_dpo_get(dpo->dpoi_index); + + mld->mld_locks++; +} + +static void +mpls_label_dpo_unlock (dpo_id_t *dpo) +{ + mpls_label_dpo_t *mld; + + mld = mpls_label_dpo_get(dpo->dpoi_index); + + mld->mld_locks--; + + if (0 == mld->mld_locks) + { + dpo_reset(&mld->mld_dpo); + pool_put(mpls_label_dpo_pool, mld); + } +} + +/** + * @brief A struct to hold tracing information for the MPLS label imposition + * node. + */ +typedef struct mpls_label_imposition_trace_t_ +{ + /** + * The MPLS header imposed + */ + mpls_unicast_header_t hdr; +} mpls_label_imposition_trace_t; + +always_inline uword +mpls_label_imposition (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * from_frame) +{ + u32 n_left_from, next_index, * from, * to_next; + + from = vlib_frame_vector_args (from_frame); + n_left_from = from_frame->n_vectors; + + next_index = node->cached_next_index; + + while (n_left_from > 0) + { + u32 n_left_to_next; + + vlib_get_next_frame(vm, node, next_index, to_next, n_left_to_next); + + while (n_left_from > 0 && n_left_to_next > 0) + { + mpls_unicast_header_t *hdr0; + mpls_label_dpo_t *mld0; + vlib_buffer_t * b0; + u32 bi0, mldi0; + u32 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); + + /* dst lookup was done by ip4 lookup */ + mldi0 = vnet_buffer(b0)->ip.adj_index[VLIB_TX]; + mld0 = mpls_label_dpo_get(mldi0); + + /* Paint the MPLS header */ + vlib_buffer_advance(b0, -sizeof(*hdr0)); + hdr0 = vlib_buffer_get_current(b0); + + // FIXME. + // need to copy the TTL from the correct place. + // for IPvX imposition from the IP header + // so we need a deidcated ipx-to-mpls-label-imp-node + // for mpls switch and stack another solution is required. + *hdr0 = mld0->mld_hdr; + + next0 = mld0->mld_dpo.dpoi_next_node; + vnet_buffer(b0)->ip.adj_index[VLIB_TX] = mld0->mld_dpo.dpoi_index; + + if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) + { + mpls_label_imposition_trace_t *tr = + vlib_add_trace (vm, node, b0, sizeof (*tr)); + tr->hdr = *hdr0; + } + + 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); + } + return from_frame->n_vectors; +} + +static u8 * +format_mpls_label_imposition_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 *); + mpls_label_imposition_trace_t * t; + mpls_unicast_header_t hdr; + uword indent; + + t = va_arg (*args, mpls_label_imposition_trace_t *); + indent = format_get_indent (s); + hdr.label_exp_s_ttl = clib_net_to_host_u32(t->hdr.label_exp_s_ttl); + + s = format (s, "%Umpls-header:%U", + format_white_space, indent, + format_mpls_header, hdr); + return (s); +} + +VLIB_REGISTER_NODE (mpls_label_imposition_node) = { + .function = mpls_label_imposition, + .name = "mpls-label-imposition", + .vector_size = sizeof (u32), + + .format_trace = format_mpls_label_imposition_trace, + .n_next_nodes = 1, + .next_nodes = { + [0] = "error-drop", + } +}; +VLIB_NODE_FUNCTION_MULTIARCH (mpls_label_imposition_node, mpls_label_imposition) + +const static dpo_vft_t mld_vft = { + .dv_lock = mpls_label_dpo_lock, + .dv_unlock = mpls_label_dpo_unlock, + .dv_format = format_mpls_label_dpo, +}; + +const static char* const mpls_label_imp_ip4_nodes[] = +{ + "mpls-label-imposition", + NULL, +}; +const static char* const mpls_label_imp_ip6_nodes[] = +{ + "mpls-label-imposition", + NULL, +}; +const static char* const mpls_label_imp_mpls_nodes[] = +{ + "mpls-label-imposition", + NULL, +}; +const static char* const * const mpls_label_imp_nodes[DPO_PROTO_NUM] = +{ + [DPO_PROTO_IP4] = mpls_label_imp_ip4_nodes, + [DPO_PROTO_IP6] = mpls_label_imp_ip6_nodes, + [DPO_PROTO_MPLS] = mpls_label_imp_mpls_nodes, +}; + + +void +mpls_label_dpo_module_init (void) +{ + dpo_register(DPO_MPLS_LABEL, &mld_vft, mpls_label_imp_nodes); +} |