/* * Copyright (c) 2016-2018 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include typedef struct { u32 next_index; u32 sw_if_index; u32 lc_index; u32 match_acl_in_index; u32 match_rule_index; u64 packet_info[6]; u32 trace_bitmap; u8 action; } acl_fa_trace_t; #define foreach_acl_fa_error \ _(ACL_DROP, "ACL deny packets") \ _(ACL_PERMIT, "ACL permit packets") \ _(ACL_NEW_SESSION, "new sessions added") \ _(ACL_EXIST_SESSION, "existing session packets") \ _(ACL_CHECK, "checked packets") \ _(ACL_RESTART_SESSION_TIMER, "restart session timer") \ _(ACL_TOO_MANY_SESSIONS, "too many sessions to add new") \ /* end of errors */ typedef enum { #define _(sym,str) ACL_FA_ERROR_##sym, foreach_acl_fa_error #undef _ ACL_FA_N_ERROR, } acl_fa_error_t; typedef struct { u32 next_index; u32 sw_if_index; u16 ethertype; } nonip_in_out_trace_t; /* packet trace format function */ static u8 * format_nonip_in_out_trace (u8 * s, u32 is_output, 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 *); nonip_in_out_trace_t *t = va_arg (*args, nonip_in_out_trace_t *); s = format (s, "%s: sw_if_index %d next_index %x ethertype %x", is_output ? "OUT-ETHER-WHITELIST" : "IN-ETHER-WHITELIST", t->sw_if_index, t->next_index, t->ethertype); return s; } static u8 * format_l2_nonip_in_trace (u8 * s, va_list * args) { return format_nonip_in_out_trace (s, 0, args); } static u8 * format_l2_nonip_out_trace (u8 * s, va_list * args) { return format_nonip_in_out_trace (s, 1, args); } #define foreach_nonip_in_error \ _(DROP, "dropped inbound non-whitelisted non-ip packets") \ _(PERMIT, "permitted inbound whitelisted non-ip packets") \ #define foreach_nonip_out_error \ _(DROP, "dropped outbound non-whitelisted non-ip packets") \ _(PERMIT, "permitted outbound whitelisted non-ip packets") \ typedef enum { #define _(sym,str) FA_IN_NONIP_ERROR_##sym, foreach_nonip_in_error #undef _ FA_IN_NONIP_N_ERROR, } l2_in_feat_arc_error_t; static char *fa_in_nonip_error_strings[] = { #define _(sym,string) string, foreach_nonip_in_error #undef _ }; typedef enum { #define _(sym,str) FA_OUT_NONIP_ERROR_##sym, foreach_nonip_out_error #undef _ FA_OUT_NONIP_N_ERROR, } l2_out_feat_arc_error_t; static char *fa_out_nonip_error_strings[] = { #define _(sym,string) string, foreach_nonip_out_error #undef _ }; always_inline int is_permitted_ethertype (acl_main_t * am, int sw_if_index0, int is_output, u16 ethertype) { u16 **v = is_output ? am->output_etype_whitelist_by_sw_if_index : am->input_etype_whitelist_by_sw_if_index; u16 *whitelist = vec_elt (v, sw_if_index0); int i; if (vec_len (whitelist) == 0) return 1; for (i = 0; i < vec_len (whitelist); i++) if (whitelist[i] == ethertype) return 1; return 0; } #define get_u16(addr) ( *((u16 *)(addr)) ) always_inline uword nonip_in_out_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame, int is_output) { acl_main_t *am = &acl_main; u32 n_left, *from; u16 nexts[VLIB_FRAME_SIZE], *next; vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b; vlib_node_runtime_t *error_node; from = vlib_frame_vector_args (frame); error_node = vlib_node_get_runtime (vm, node->node_index); vlib_get_buffers (vm, from, bufs, frame->n_vectors); /* set the initial values for the current buffer the next pointers */ b = bufs; next = nexts; n_left = frame->n_vectors; while (n_left > 0) { u32 next_index = 0; u32 sw_if_index0 = vnet_buffer (b[0])->sw_if_index[is_output ? VLIB_TX : VLIB_RX]; u16 ethertype = 0; int error0 = 0; ethernet_header_t *h0 = vlib_buffer_get_current (b[0]); u8 *l3h0 = (u8 *) h0 + vnet_buffer (b[0])->l2.l2_len; ethertype = clib_net_to_host_u16 (get_u16 (l3h0 - 2)); if (is_permitted_ethertype (am, sw_if_index0, is_output, ethertype)) vnet_feature_next (&next_index, b[0]); next[0] = next_index; if (0 == next[0]) b[0]->error = error_node->errors[error0]; if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && (b[0]->flags & VLIB_BUFFER_IS_TRACED))) { nonip_in_out_trace_t *t = vlib_add_trace (vm, node, b[0], sizeof (*t)); t->sw_if_index = sw_if_index0; t->ethertype = ethertype; t->next_index = next[0]; } next[0] = next[0] < node->n_next_nodes ? next[0] : 0; next++; b++; n_left--; } vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors); return frame->n_vectors; } VLIB_NODE_FN (acl_in_nonip_node) (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return nonip_in_out_node_fn (vm, node, frame, 0); } VLIB_NODE_FN (acl_out_nonip_node) (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return nonip_in_out_node_fn (vm, node, frame, 1); } VLIB_REGISTER_NODE (acl_in_nonip_node) = { .name = "acl-plugin-in-nonip-l2", .vector_size = sizeof (u32), .format_trace = format_l2_nonip_in_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN (fa_in_nonip_error_strings), .error_strings = fa_in_nonip_error_strings, .n_next_nodes = ACL_FA_N_NEXT, .next_nodes = { [ACL_FA_ERROR_DROP] = "error-drop", } }; VNET_FEATURE_INIT (acl_in_l2_nonip_fa_feature, static) = { .arc_name = "l2-input-nonip", .node_name = "acl-plugin-in-nonip-l2", .runs_before = VNET_FEATURES ("l2-input-feat-arc-end"), }; VLIB_REGISTER_NODE (acl_out_nonip_node) = { .name = "acl-plugin-out-nonip-l2", .vector_size = sizeof (u32), .format_trace = format_l2_nonip_out_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN (fa_out_nonip_error_strings), .error_strings = fa_out_nonip_error_strings, .n_next_nodes = ACL_FA_N_NEXT, .next_nodes = { [ACL_FA_ERROR_DROP] = "error-drop", } }; VNET_FEATURE_INIT (acl_out_l2_nonip_fa_feature, static) = { .arc_name = "l2-output-nonip", .node_name = "acl-plugin-out-nonip-l2", .runs_before = VNET_FEATURES ("l2-output-feat-arc-end"), }; /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */