diff options
Diffstat (limited to 'vpp/app/l2t_l2.c')
-rw-r--r-- | vpp/app/l2t_l2.c | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/vpp/app/l2t_l2.c b/vpp/app/l2t_l2.c new file mode 100644 index 00000000000..5c8327d5262 --- /dev/null +++ b/vpp/app/l2t_l2.c @@ -0,0 +1,252 @@ +/* + * Copyright (c) 2015 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/ip/ip.h> +#include <vnet/ethernet/ethernet.h> + +#if DPDK == 0 +#include <vnet/devices/pci/ixgev.h> +#include <vnet/devices/pci/ixge.h> +#include <vnet/devices/pci/ige.h> +#else +#include <vnet/devices/dpdk/dpdk.h> +#endif + +#include <vppinfra/error.h> +#include <vppinfra/hash.h> +#include <app/l2t.h> + +l2t_main_t l2t_main; + +/* Statistics (not really errors) */ +#define foreach_l2t_l2_error \ +_(NETWORK_TO_USER, "L2 network to user (ip6) pkts") + +static char * l2t_l2_error_strings[] = { +#define _(sym,string) string, + foreach_l2t_l2_error +#undef _ +}; + +typedef enum { +#define _(sym,str) L2T_L2_ERROR_##sym, + foreach_l2t_l2_error +#undef _ + L2T_L2_N_ERROR, +} l2t_l2_error_t; + +/* + * Packets go to ethernet-input when they don't match a mapping + */ +typedef enum { + L2T_L2_NEXT_DROP, + L2T_L2_NEXT_ETHERNET_INPUT, + L2T_L2_NEXT_IP6_LOOKUP, + L2T_L2_N_NEXT, +} l2t_l2_next_t; + +vlib_node_registration_t l2t_l2_node; + +#define NSTAGES 3 + +static inline void stage0 (vlib_main_t * vm, + vlib_node_runtime_t * node, + u32 buffer_index) +{ + vlib_buffer_t *b = vlib_get_buffer (vm, buffer_index); + vlib_prefetch_buffer_header (b, STORE); + CLIB_PREFETCH (b->data, 2*CLIB_CACHE_LINE_BYTES, STORE); +} + +static inline void stage1 (vlib_main_t * vm, + vlib_node_runtime_t * node, + u32 bi) +{ + vlib_buffer_t *b = vlib_get_buffer (vm, bi); + l2t_main_t *lm = &l2t_main; + ethernet_header_t * eh; + ethernet_vlan_header_t *vh; + u32 session_index; + uword *p; + uword vlan_and_sw_if_index_key; + + /* just in case, needed to test with the tun/tap device */ + vlib_buffer_reset(b); + + eh = vlib_buffer_get_current (b); + + /* Not a VLAN pkt? send to ethernet-input... */ + if (PREDICT_FALSE(eh->type != clib_host_to_net_u16 (0x8100))) { + vnet_buffer(b)->l2t.next_index = L2T_L2_NEXT_ETHERNET_INPUT; + return; + } + vh = (ethernet_vlan_header_t *)(eh+1); + + /* look up session */ + vlan_and_sw_if_index_key = ((uword)(vh->priority_cfi_and_id)<<32) + | vnet_buffer(b)->sw_if_index[VLIB_RX]; + + p = hash_get (lm->session_by_vlan_and_rx_sw_if_index, + vlan_and_sw_if_index_key); + + if (PREDICT_FALSE(p == 0)) { + /* $$$ drop here if not for our MAC? */ + vnet_buffer(b)->l2t.next_index = L2T_L2_NEXT_ETHERNET_INPUT; + return; + } else { + session_index = p[0]; + } + + /* Remember mapping index, prefetch the mini counter */ + vnet_buffer(b)->l2t.next_index = L2T_L2_NEXT_IP6_LOOKUP; + vnet_buffer(b)->l2t.session_index = session_index; + + /* Each mapping has 2 x (pkt, byte) counters, hence the shift */ + CLIB_PREFETCH(lm->counter_main.mini + (p[0]<<1), CLIB_CACHE_LINE_BYTES, + STORE); +} + +static inline u32 last_stage (vlib_main_t *vm, vlib_node_runtime_t *node, + u32 bi) +{ + vlib_buffer_t *b = vlib_get_buffer (vm, bi); + l2t_main_t *lm = &l2t_main; + ethernet_header_t * eh = vlib_buffer_get_current (b); + vlib_node_t *n = vlib_get_node (vm, l2t_l2_node.index); + u32 node_counter_base_index = n->error_heap_index; + vlib_error_main_t * em = &vm->error_main; + l2tpv3_header_t * l2t; /* l2 header */ + ethernet_vlan_header_t * vh; /* 802.1q vlan header */ + u32 counter_index; + l2t_session_t *s; + ip6_header_t *ip6; + u16 payload_ethertype; + u8 dst_mac_address[6]; + u8 src_mac_address[6]; + u16 payload_length; + i32 backup; + + /* Other-than-output pkt? We're done... */ + if (vnet_buffer(b)->l2t.next_index != L2T_L2_NEXT_IP6_LOOKUP) + return vnet_buffer(b)->l2t.next_index; + + vh = (ethernet_vlan_header_t *)(eh+1); + + em->counters[node_counter_base_index + L2T_L2_ERROR_NETWORK_TO_USER] += 1; + + counter_index = + session_index_to_counter_index (vnet_buffer(b)->l2t.session_index, + SESSION_COUNTER_NETWORK_TO_USER); + + /* per-mapping byte stats include the ethernet header */ + vlib_increment_combined_counter (&lm->counter_main, counter_index, + 1 /* packet_increment */, + vlib_buffer_length_in_chain (vm, b) + + sizeof (ethernet_header_t)); + + s = pool_elt_at_index (lm->sessions, vnet_buffer(b)->l2t.session_index); + + /* Save src/dst MAC addresses */ +#define _(i) dst_mac_address[i] = eh->dst_address[i]; + _(0) _(1) _(2) _(3) _(4) _(5); +#undef _ +#define _(i) src_mac_address[i] = eh->src_address[i]; + _(0) _(1) _(2) _(3) _(4) _(5); +#undef _ + + payload_ethertype = vh->type; + + /* Splice out the 802.1q vlan tag */ + vlib_buffer_advance (b, 4); + eh = vlib_buffer_get_current (b); + + /* restore src/dst MAC addresses */ +#define _(i) eh->dst_address[i] = dst_mac_address[i]; + _(0) _(1) _(2) _(3) _(4) _(5); +#undef _ +#define _(i) eh->src_address[i] = src_mac_address[i]; + _(0) _(1) _(2) _(3) _(4) _(5); +#undef _ + eh->type = payload_ethertype; + + /* Paint on an l2tpv3 hdr */ + backup = sizeof(*l2t); +#if 0 + /* back up 4 bytes less if no l2 sublayer */ + backup -= s->l2_sublayer_present ? 0 : 4; +#endif + + vlib_buffer_advance (b, -backup); + l2t = vlib_buffer_get_current (b); + + l2t->session_id = s->remote_session_id; + l2t->cookie = s->remote_cookie; + +#if 0 + if (s->l2_sublayer_present) + l2t->l2_specific_sublayer = 0; +#endif + + /* Paint on an ip6 header */ + vlib_buffer_advance (b, -(sizeof (*ip6))); + ip6 = vlib_buffer_get_current (b); + + ip6->ip_version_traffic_class_and_flow_label = + clib_host_to_net_u32 (0x6<<28); + + /* calculate ip6 payload length */ + payload_length = vlib_buffer_length_in_chain (vm, b); + payload_length -= sizeof (*ip6); + + ip6->payload_length = clib_host_to_net_u16 (payload_length); + ip6->protocol = 0x73; /* l2tpv3 */ + ip6->hop_limit = 0xff; + ip6->src_address.as_u64[0] = s->our_address.as_u64[0]; + ip6->src_address.as_u64[1] = s->our_address.as_u64[1]; + ip6->dst_address.as_u64[0] = s->client_address.as_u64[0]; + ip6->dst_address.as_u64[1] = s->client_address.as_u64[1]; + + return L2T_L2_NEXT_IP6_LOOKUP; +} + +#include <vnet/pipeline.h> + +static uword l2t_l2_node_fn (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + return dispatch_pipeline (vm, node, frame); +} + +VLIB_REGISTER_NODE (l2t_l2_node) = { + .function = l2t_l2_node_fn, + .name = "l2t-l2-input", + .vector_size = sizeof (u32), + .format_trace = format_l2t_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + + .n_errors = ARRAY_LEN(l2t_l2_error_strings), + .error_strings = l2t_l2_error_strings, + + .n_next_nodes = L2T_L2_N_NEXT, + + /* edit / add dispositions here */ + .next_nodes = { + [L2T_L2_NEXT_IP6_LOOKUP] = "ip6-lookup", + [L2T_L2_NEXT_ETHERNET_INPUT] = "ethernet-input", + [L2T_L2_NEXT_DROP] = "error-drop", + }, +}; + |