diff options
Diffstat (limited to 'src/plugins/gbp/gbp_policy_node.c')
| -rw-r--r-- | src/plugins/gbp/gbp_policy_node.c | 388 |
1 files changed, 388 insertions, 0 deletions
diff --git a/src/plugins/gbp/gbp_policy_node.c b/src/plugins/gbp/gbp_policy_node.c new file mode 100644 index 00000000000..aaf362d2c9a --- /dev/null +++ b/src/plugins/gbp/gbp_policy_node.c @@ -0,0 +1,388 @@ +/* + * Copyright (c) 2018 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 <plugins/gbp/gbp.h> +#include <plugins/gbp/gbp_policy_dpo.h> + +#include <vnet/vxlan-gbp/vxlan_gbp_packet.h> + +#define foreach_gbp_policy \ + _(DENY, "deny") + +typedef enum +{ +#define _(sym,str) GBP_ERROR_##sym, + foreach_gbp_policy +#undef _ + GBP_POLICY_N_ERROR, +} gbp_policy_error_t; + +static char *gbp_policy_error_strings[] = { +#define _(sym,string) string, + foreach_gbp_policy +#undef _ +}; + +typedef enum +{ +#define _(sym,str) GBP_POLICY_NEXT_##sym, + foreach_gbp_policy +#undef _ + GBP_POLICY_N_NEXT, +} gbp_policy_next_t; + +/** + * per-packet trace data + */ +typedef struct gbp_policy_trace_t_ +{ + /* per-pkt trace data */ + u32 src_epg; + u32 dst_epg; + u32 acl_index; + u32 allowed; +} gbp_policy_trace_t; + +always_inline dpo_proto_t +ethertype_to_dpo_proto (u16 etype) +{ + etype = clib_net_to_host_u16 (etype); + + switch (etype) + { + case ETHERNET_TYPE_IP4: + return (DPO_PROTO_IP4); + case ETHERNET_TYPE_IP6: + return (DPO_PROTO_IP6); + } + + return (DPO_PROTO_NONE); +} + +always_inline u32 +gbp_rule_l2_redirect (const gbp_rule_t * gu, vlib_buffer_t * b0) +{ + const ethernet_header_t *eth0; + const dpo_id_t *dpo; + dpo_proto_t dproto; + + eth0 = vlib_buffer_get_current (b0); + /* pop the ethernet header to prepare for L3 rewrite */ + vlib_buffer_advance (b0, vnet_buffer (b0)->l2.l2_len); + + dproto = ethertype_to_dpo_proto (eth0->type); + dpo = &gu->gu_dpo[GBP_POLICY_NODE_L2][dproto]; + + /* save the LB index for the next node and reset the IP flow hash + * so it's recalculated */ + vnet_buffer (b0)->ip.adj_index[VLIB_TX] = dpo->dpoi_index; + vnet_buffer (b0)->ip.flow_hash = 0; + + return (dpo->dpoi_next_node); +} + +always_inline u8 +gbp_policy_is_ethertype_allowed (const gbp_contract_t * gc0, u16 ethertype) +{ + u16 *et; + + vec_foreach (et, gc0->gc_allowed_ethertypes) + { + if (*et == ethertype) + return (1); + } + return (0); +} + +static uword +gbp_policy_inline (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame, u8 is_port_based) +{ + gbp_main_t *gm = &gbp_main; + gbp_policy_main_t *gpm = &gbp_policy_main; + u32 n_left_from, *from, *to_next; + u32 next_index; + + next_index = 0; + n_left_from = frame->n_vectors; + from = vlib_frame_vector_args (frame); + + 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) + { + const ethernet_header_t *h0; + const gbp_endpoint_t *ge0; + const gbp_contract_t *gc0; + gbp_policy_next_t next0; + gbp_contract_key_t key0; + u32 bi0, sw_if_index0; + vlib_buffer_t *b0; + index_t gci0; + + gc0 = NULL; + next0 = GBP_POLICY_NEXT_DENY; + 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); + h0 = vlib_buffer_get_current (b0); + sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_TX]; + + /* + * If the A0bit is set then policy has already been applied + * and we skip enforcement here. + */ + if (vnet_buffer2 (b0)->gbp.flags & VXLAN_GBP_GPFLAGS_A) + { + next0 = vnet_l2_feature_next (b0, + gpm->l2_output_feat_next + [is_port_based], + (is_port_based ? + L2OUTPUT_FEAT_GBP_POLICY_PORT : + L2OUTPUT_FEAT_GBP_POLICY_MAC)); + key0.as_u32 = ~0; + goto trace; + } + /* + * determine the src and dst EPG + */ + if (is_port_based) + ge0 = gbp_endpoint_find_itf (sw_if_index0); + else + ge0 = gbp_endpoint_find_mac (h0->dst_address, + vnet_buffer (b0)->l2.bd_index); + + if (NULL != ge0) + key0.gck_dst = ge0->ge_fwd.gef_epg_id; + else + /* If you cannot determine the destination EP then drop */ + goto trace; + + key0.gck_src = vnet_buffer2 (b0)->gbp.src_epg; + + if (EPG_INVALID != key0.gck_src) + { + if (PREDICT_FALSE (key0.gck_src == key0.gck_dst)) + { + /* + * intra-epg allowed + */ + next0 = + vnet_l2_feature_next (b0, + gpm->l2_output_feat_next + [is_port_based], + (is_port_based ? + L2OUTPUT_FEAT_GBP_POLICY_PORT : + L2OUTPUT_FEAT_GBP_POLICY_MAC)); + vnet_buffer2 (b0)->gbp.flags |= VXLAN_GBP_GPFLAGS_A; + } + else + { + gci0 = gbp_contract_find (&key0); + + if (INDEX_INVALID != gci0) + { + u32 rule_match_p0, trace_bitmap0; + fa_5tuple_opaque_t pkt_5tuple0; + u32 acl_pos_p0, acl_match_p0; + u8 is_ip60, l2_len0, action0; + const gbp_rule_t *gu; + u16 ether_type0; + const u8 *h0; + + action0 = 0; + gc0 = gbp_contract_get (gci0); + l2_len0 = vnet_buffer (b0)->l2.l2_len; + h0 = vlib_buffer_get_current (b0); + + ether_type0 = *(u16 *) (h0 + l2_len0 - 2); + + if (!gbp_policy_is_ethertype_allowed (gc0, ether_type0)) + { + /* + * black list model so drop + */ + goto trace; + } + + if ((ether_type0 == + clib_net_to_host_u16 (ETHERNET_TYPE_IP6)) + || (ether_type0 == + clib_net_to_host_u16 (ETHERNET_TYPE_IP4))) + { + is_ip60 = + (ether_type0 == + clib_net_to_host_u16 (ETHERNET_TYPE_IP6)) ? 1 : + 0; + /* + * tests against the ACL + */ + acl_plugin_fill_5tuple_inline (gm-> + acl_plugin.p_acl_main, + gc0->gc_lc_index, b0, + is_ip60, + /* is_input */ 0, + /* is_l2_path */ 1, + &pkt_5tuple0); + acl_plugin_match_5tuple_inline (gm-> + acl_plugin.p_acl_main, + gc0->gc_lc_index, + &pkt_5tuple0, + is_ip60, &action0, + &acl_pos_p0, + &acl_match_p0, + &rule_match_p0, + &trace_bitmap0); + + if (action0 > 0) + { + vnet_buffer2 (b0)->gbp.flags |= + VXLAN_GBP_GPFLAGS_A; + gu = + gbp_rule_get (gc0->gc_rules[rule_match_p0]); + + switch (gu->gu_action) + { + case GBP_RULE_PERMIT: + next0 = vnet_l2_feature_next + (b0, + gpm->l2_output_feat_next + [is_port_based], + (is_port_based ? + L2OUTPUT_FEAT_GBP_POLICY_PORT : + L2OUTPUT_FEAT_GBP_POLICY_MAC)); + break; + case GBP_RULE_DENY: + next0 = 0; + break; + case GBP_RULE_REDIRECT: + next0 = gbp_rule_l2_redirect (gu, b0); + break; + } + } + } + } + } + } + else + { + /* + * the src EPG is not set when the packet arrives on an EPG + * uplink interface and we do not need to apply policy + */ + next0 = + vnet_l2_feature_next (b0, + gpm->l2_output_feat_next[is_port_based], + (is_port_based ? + L2OUTPUT_FEAT_GBP_POLICY_PORT : + L2OUTPUT_FEAT_GBP_POLICY_MAC)); + } + + trace: + if (PREDICT_FALSE ((b0->flags & VLIB_BUFFER_IS_TRACED))) + { + gbp_policy_trace_t *t = + vlib_add_trace (vm, node, b0, sizeof (*t)); + t->src_epg = key0.gck_src; + t->dst_epg = key0.gck_dst; + t->acl_index = (gc0 ? gc0->gc_acl_index : ~0), + t->allowed = (next0 != GBP_POLICY_NEXT_DENY); + } + + /* verify speculative enqueue, maybe switch current next frame */ + 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 frame->n_vectors; +} + +VLIB_NODE_FN (gbp_policy_port_node) (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + return (gbp_policy_inline (vm, node, frame, 1)); +} + +VLIB_NODE_FN (gbp_policy_mac_node) (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + return (gbp_policy_inline (vm, node, frame, 0)); +} + +/* packet trace format function */ +static u8 * +format_gbp_policy_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 *); + gbp_policy_trace_t *t = va_arg (*args, gbp_policy_trace_t *); + + s = + format (s, "src:%d, dst:%d, acl:%d allowed:%d", + t->src_epg, t->dst_epg, t->acl_index, t->allowed); + + return s; +} + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (gbp_policy_port_node) = { + .name = "gbp-policy-port", + .vector_size = sizeof (u32), + .format_trace = format_gbp_policy_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + + .n_errors = ARRAY_LEN(gbp_policy_error_strings), + .error_strings = gbp_policy_error_strings, + + .n_next_nodes = GBP_POLICY_N_NEXT, + + .next_nodes = { + [GBP_POLICY_NEXT_DENY] = "error-drop", + }, +}; + +VLIB_REGISTER_NODE (gbp_policy_mac_node) = { + .name = "gbp-policy-mac", + .vector_size = sizeof (u32), + .format_trace = format_gbp_policy_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + .sibling_of = "gbp-policy-port", +}; + +/* *INDENT-ON* */ + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |