diff options
Diffstat (limited to 'src/plugins')
| -rw-r--r-- | src/plugins/acl.am | 1 | ||||
| -rw-r--r-- | src/plugins/acl/acl.c | 341 | ||||
| -rw-r--r-- | src/plugins/acl/acl.h | 30 | ||||
| -rw-r--r-- | src/plugins/acl/fa_node.c | 39 | ||||
| -rw-r--r-- | src/plugins/acl/fa_node.h | 7 | ||||
| -rw-r--r-- | src/plugins/acl/hash_lookup.c | 742 | ||||
| -rw-r--r-- | src/plugins/acl/hash_lookup.h | 60 | ||||
| -rw-r--r-- | src/plugins/acl/hash_lookup.md | 241 | ||||
| -rw-r--r-- | src/plugins/acl/hash_lookup_private.h | 27 | ||||
| -rw-r--r-- | src/plugins/acl/hash_lookup_types.h | 94 |
10 files changed, 1572 insertions, 10 deletions
diff --git a/src/plugins/acl.am b/src/plugins/acl.am index 01e0197c929..0a414481dbf 100644 --- a/src/plugins/acl.am +++ b/src/plugins/acl.am @@ -16,6 +16,7 @@ vppplugins_LTLIBRARIES += acl_plugin.la acl_plugin_la_SOURCES = \ acl/acl.c \ + acl/hash_lookup.c \ acl/fa_node.c \ acl/l2sess.h \ acl/manual_fns.h \ diff --git a/src/plugins/acl/acl.c b/src/plugins/acl/acl.c index e7b8549535d..51929ad9188 100644 --- a/src/plugins/acl/acl.c +++ b/src/plugins/acl/acl.c @@ -52,6 +52,7 @@ #undef vl_api_version #include "fa_node.h" +#include "hash_lookup.h" acl_main_t acl_main; @@ -154,6 +155,7 @@ acl_add_list (u32 count, vl_api_acl_rule_t rules[], for (i = 0; i < count; i++) { r = &acl_new_rules[i]; + memset(r, 0, sizeof(*r)); r->is_permit = rules[i].is_permit; r->is_ipv6 = rules[i].is_ipv6; if (r->is_ipv6) @@ -188,12 +190,14 @@ acl_add_list (u32 count, vl_api_acl_rule_t rules[], else { a = am->acls + *acl_list_index; + hash_acl_delete(am, *acl_list_index); /* Get rid of the old rules */ clib_mem_free (a->rules); } a->rules = acl_new_rules; a->count = count; memcpy (a->tag, tag, sizeof (a->tag)); + hash_acl_add(am, *acl_list_index); return 0; } @@ -209,6 +213,19 @@ acl_del_list (u32 acl_list_index) return -1; } + if (acl_list_index < vec_len(am->input_sw_if_index_vec_by_acl)) { + if (vec_len(am->input_sw_if_index_vec_by_acl[acl_list_index]) > 0) { + /* ACL is applied somewhere inbound. Refuse to delete */ + return -1; + } + } + if (acl_list_index < vec_len(am->output_sw_if_index_vec_by_acl)) { + if (vec_len(am->output_sw_if_index_vec_by_acl[acl_list_index]) > 0) { + /* ACL is applied somewhere outbound. Refuse to delete */ + return -1; + } + } + /* delete any references to the ACL */ for (i = 0; i < vec_len (am->output_acl_vec_by_sw_if_index); i++) { @@ -240,7 +257,9 @@ acl_del_list (u32 acl_list_index) } } } + /* delete the hash table data */ + hash_acl_delete(am, acl_list_index); /* now we can delete the ACL itself */ a = &am->acls[acl_list_index]; if (a->rules) @@ -619,28 +638,62 @@ acl_interface_out_enable_disable (acl_main_t * am, u32 sw_if_index, return rv; } +static int +acl_is_not_defined(acl_main_t *am, u32 acl_list_index) +{ + return (pool_is_free_index (am->acls, acl_list_index)); +} + static int acl_interface_add_inout_acl (u32 sw_if_index, u8 is_input, u32 acl_list_index) { acl_main_t *am = &acl_main; + if (acl_is_not_defined(am, acl_list_index)) { + /* ACL is not defined. Can not apply */ + return -1; + } + if (is_input) { vec_validate (am->input_acl_vec_by_sw_if_index, sw_if_index); + + u32 index = vec_search(am->input_acl_vec_by_sw_if_index[sw_if_index], acl_list_index); + if (index < vec_len(am->input_acl_vec_by_sw_if_index[sw_if_index])) { + clib_warning("ACL %d is already applied inbound on sw_if_index %d (index %d)", + acl_list_index, sw_if_index, index); + /* the entry is already there */ + return -1; + } vec_add (am->input_acl_vec_by_sw_if_index[sw_if_index], &acl_list_index, 1); + vec_validate (am->input_sw_if_index_vec_by_acl, acl_list_index); + vec_add (am->input_sw_if_index_vec_by_acl[acl_list_index], &sw_if_index, + 1); acl_interface_in_enable_disable (am, sw_if_index, 1); } else { vec_validate (am->output_acl_vec_by_sw_if_index, sw_if_index); + + u32 index = vec_search(am->output_acl_vec_by_sw_if_index[sw_if_index], acl_list_index); + if (index < vec_len(am->output_acl_vec_by_sw_if_index[sw_if_index])) { + clib_warning("ACL %d is already applied outbound on sw_if_index %d (index %d)", + acl_list_index, sw_if_index, index); + /* the entry is already there */ + return -1; + } vec_add (am->output_acl_vec_by_sw_if_index[sw_if_index], &acl_list_index, 1); + vec_validate (am->output_sw_if_index_vec_by_acl, acl_list_index); + vec_add (am->output_sw_if_index_vec_by_acl[acl_list_index], &sw_if_index, + 1); acl_interface_out_enable_disable (am, sw_if_index, 1); } return 0; } + static int acl_interface_del_inout_acl (u32 sw_if_index, u8 is_input, u32 acl_list_index) { @@ -661,6 +714,15 @@ acl_interface_del_inout_acl (u32 sw_if_index, u8 is_input, u32 acl_list_index) break; } } + + if (acl_list_index < vec_len(am->input_sw_if_index_vec_by_acl)) { + u32 index = vec_search(am->input_sw_if_index_vec_by_acl[acl_list_index], sw_if_index); + if (index < vec_len(am->input_sw_if_index_vec_by_acl[acl_list_index])) { + hash_acl_unapply(am, sw_if_index, is_input, acl_list_index); + vec_del1 (am->input_sw_if_index_vec_by_acl[acl_list_index], index); + } + } + if (0 == vec_len (am->input_acl_vec_by_sw_if_index[sw_if_index])) { acl_interface_in_enable_disable (am, sw_if_index, 0); @@ -680,6 +742,15 @@ acl_interface_del_inout_acl (u32 sw_if_index, u8 is_input, u32 acl_list_index) break; } } + + if (acl_list_index < vec_len(am->output_sw_if_index_vec_by_acl)) { + u32 index = vec_search(am->output_sw_if_index_vec_by_acl[acl_list_index], sw_if_index); + if (index < vec_len(am->output_sw_if_index_vec_by_acl[acl_list_index])) { + hash_acl_unapply(am, sw_if_index, is_input, acl_list_index); + vec_del1 (am->output_sw_if_index_vec_by_acl[acl_list_index], index); + } + } + if (0 == vec_len (am->output_acl_vec_by_sw_if_index[sw_if_index])) { acl_interface_out_enable_disable (am, sw_if_index, 0); @@ -692,16 +763,41 @@ static void acl_interface_reset_inout_acls (u32 sw_if_index, u8 is_input) { acl_main_t *am = &acl_main; + int i; if (is_input) { acl_interface_in_enable_disable (am, sw_if_index, 0); vec_validate (am->input_acl_vec_by_sw_if_index, sw_if_index); + + for(i = vec_len(am->input_acl_vec_by_sw_if_index[sw_if_index])-1; i>=0; i--) { + u32 acl_list_index = am->input_acl_vec_by_sw_if_index[sw_if_index][i]; + hash_acl_unapply(am, sw_if_index, is_input, acl_list_index); + if (acl_list_index < vec_len(am->input_sw_if_index_vec_by_acl)) { + u32 index = vec_search(am->input_sw_if_index_vec_by_acl[acl_list_index], sw_if_index); + if (index < vec_len(am->input_sw_if_index_vec_by_acl[acl_list_index])) { + vec_del1 (am->input_sw_if_index_vec_by_acl[acl_list_index], index); + } + } + } + vec_reset_length (am->input_acl_vec_by_sw_if_index[sw_if_index]); } else { acl_interface_out_enable_disable (am, sw_if_index, 0); vec_validate (am->output_acl_vec_by_sw_if_index, sw_if_index); + + for(i = vec_len(am->output_acl_vec_by_sw_if_index[sw_if_index])-1; i>=0; i--) { + u32 acl_list_index = am->output_acl_vec_by_sw_if_index[sw_if_index][i]; + hash_acl_unapply(am, sw_if_index, is_input, acl_list_index); + if (acl_list_index < vec_len(am->output_sw_if_index_vec_by_acl)) { + u32 index = vec_search(am->output_sw_if_index_vec_by_acl[acl_list_index], sw_if_index); + if (index < vec_len(am->output_sw_if_index_vec_by_acl[acl_list_index])) { + vec_del1 (am->output_sw_if_index_vec_by_acl[acl_list_index], index); + } + } + } + vec_reset_length (am->output_acl_vec_by_sw_if_index[sw_if_index]); } } @@ -711,13 +807,19 @@ acl_interface_add_del_inout_acl (u32 sw_if_index, u8 is_add, u8 is_input, u32 acl_list_index) { int rv = -1; + acl_main_t *am = &acl_main; if (is_add) { rv = acl_interface_add_inout_acl (sw_if_index, is_input, acl_list_index); + if (rv == 0) + { + hash_acl_apply(am, sw_if_index, is_input, acl_list_index); + } } else { + hash_acl_unapply(am, sw_if_index, is_input, acl_list_index); rv = acl_interface_del_inout_acl (sw_if_index, is_input, acl_list_index); } @@ -1198,9 +1300,18 @@ vl_api_acl_interface_set_acl_list_t_handler for (i = 0; i < mp->count; i++) { - acl_interface_add_del_inout_acl (sw_if_index, 1, (i < mp->n_input), - ntohl (mp->acls[i])); + if(acl_is_not_defined(am, ntohl (mp->acls[i]))) { + /* ACL does not exist, so we can not apply it */ + rv = -1; + } } + if (0 == rv) { + for (i = 0; i < mp->count; i++) + { + acl_interface_add_del_inout_acl (sw_if_index, 1, (i < mp->n_input), + ntohl (mp->acls[i])); + } + } } REPLY_MACRO (VL_API_ACL_INTERFACE_SET_ACL_LIST_REPLY); @@ -1706,6 +1817,11 @@ acl_set_aclplugin_fn (vlib_main_t * vm, } goto done; } + if (unformat (input, "use-hash-acl-matching %u", &val)) + { + am->use_hash_acl_matching = (val !=0); + goto done; + } if (unformat (input, "l4-match-nonfirst-fragment %u", &val)) { am->l4_match_nonfirst_fragment = (val != 0); @@ -1800,7 +1916,6 @@ done: return error; } - static clib_error_t * acl_show_aclplugin_fn (vlib_main_t * vm, unformat_input_t * input, @@ -1809,13 +1924,16 @@ acl_show_aclplugin_fn (vlib_main_t * vm, clib_error_t *error = 0; acl_main_t *am = &acl_main; vnet_interface_main_t *im = &am->vnet_main->interface_main; + u32 *pj; vnet_sw_interface_t *swif; if (unformat (input, "sessions")) { - u8 * out0 = 0; + u8 * out0 = format(0, ""); u16 wk; + u32 show_bihash_verbose = 0; + unformat (input, "verbose %u", &show_bihash_verbose); pool_foreach (swif, im->sw_interfaces, ({ u32 sw_if_index = swif->sw_if_index; @@ -1856,6 +1974,215 @@ acl_show_aclplugin_fn (vlib_main_t * vm, am->fa_cleaner_wait_time_increment * 1000.0, ((f64)am->fa_current_cleaner_timer_wait_interval) * 1000.0/(f64)vm->clib_time.clocks_per_second); vec_free(out0); + show_fa_sessions_hash(vm, show_bihash_verbose); + } + else if (unformat (input, "interface")) + { + u32 sw_if_index = ~0; + u32 swi; + u8 * out0 = format(0, ""); + unformat (input, "sw_if_index %u", &sw_if_index); + for(swi = 0; (swi < vec_len(am->input_acl_vec_by_sw_if_index)) || + (swi < vec_len(am->output_acl_vec_by_sw_if_index)); swi++) { + out0 = format(out0, "sw_if_index %d:\n", swi); + + if ((swi < vec_len(am->input_acl_vec_by_sw_if_index)) && + (vec_len(am->input_acl_vec_by_sw_if_index[swi]) > 0)) { + out0 = format(out0, " input acl(s): "); + vec_foreach(pj, am->input_acl_vec_by_sw_if_index[swi]) { + out0 = format(out0, "%d ", *pj); + } + out0 = format(out0, "\n"); + } + + if ((swi < vec_len(am->output_acl_vec_by_sw_if_index)) && + (vec_len(am->output_acl_vec_by_sw_if_index[swi]) > 0)) { + out0 = format(out0, " output acl(s): "); + vec_foreach(pj, am->output_acl_vec_by_sw_if_index[swi]) { + out0 = format(out0, "%d ", *pj); + } + out0 = format(out0, "\n"); + } + + } + vlib_cli_output(vm, "\n%s\n", out0); + vec_free(out0); + } + else if (unformat (input, "acl")) + { + u32 acl_index = ~0; + u32 i; + u8 * out0 = format(0, ""); + unformat (input, "index %u", &acl_index); + for(i=0; i<vec_len(am->acls); i++) { + if (acl_is_not_defined(am, i)) { + /* don't attempt to show the ACLs that do not exist */ + continue; + } + if ((acl_index != ~0) && (acl_index != i)) { + continue; + } + out0 = format(out0, "acl-index %u count %u tag {%s}\n", i, am->acls[i].count, am->acls[i].tag); + acl_rule_t *r; + int j; + for(j=0; j<am->acls[i].count; j++) { + r = &am->acls[i].rules[j]; + out0 = format(out0, " %4d: %s ", j, r->is_ipv6 ? "ipv6" : "ipv4"); + out0 = format_acl_action(out0, r->is_permit); + out0 = format(out0, " src %U/%d", format_ip46_address, &r->src, IP46_TYPE_ANY, r->src_prefixlen); + out0 = format(out0, " dst %U/%d", format_ip46_address, &r->dst, IP46_TYPE_ANY, r->dst_prefixlen); + out0 = format(out0, " proto %d", r->proto); + out0 = format(out0, " sport %d", r->src_port_or_type_first); + if (r->src_port_or_type_first != r->src_port_or_type_last) { + out0 = format(out0, "-%d", r->src_port_or_type_last); + } + out0 = format(out0, " dport %d", r->dst_port_or_code_first); + if (r->dst_port_or_code_first != r->dst_port_or_code_last) { + out0 = format(out0, "-%d", r->dst_port_or_code_last); + } + if (r->tcp_flags_mask || r->tcp_flags_value) { + out0 = format(out0, " tcpflags %d mask %d", r->tcp_flags_value, r->tcp_flags_mask); + } + out0 = format(out0, "\n"); + } + + if (i<vec_len(am->input_sw_if_index_vec_by_acl)) { + out0 = format(out0, " applied inbound on sw_if_index: "); + vec_foreach(pj, am->input_sw_if_index_vec_by_acl[i]) { + out0 = format(out0, "%d ", *pj); + } + out0 = format(out0, "\n"); + } + if (i<vec_len(am->output_sw_if_index_vec_by_acl)) { + out0 = format(out0, " applied outbound on sw_if_index: "); + vec_foreach(pj, am->output_sw_if_index_vec_by_acl[i]) { + out0 = format(out0, "%d ", *pj); + } + out0 = format(out0, "\n"); + } + } + vlib_cli_output(vm, "\n%s\n", out0); + vec_free(out0); + } + else if (unformat (input, "tables")) + { + ace_mask_type_entry_t *mte; + u32 acl_index = ~0; + u32 sw_if_index = ~0; + int show_acl_hash_info = 0; + int show_applied_info = 0; + int show_mask_type = 0; + int show_bihash = 0; + u32 show_bihash_verbose = 0; + + if (unformat (input, "acl")) { + show_mask_type = 1; + unformat (input, "index %u", &acl_index); + } else if (unformat (input, "applied")) { + show_applied_info = 1; + unformat (input, "sw_if_index %u", &sw_if_index); + } else if (unformat (input, "mask")) { + show_mask_type = 1; + } else if (unformat (input, "hash")) { + show_bihash = 1; + unformat (input, "verbose %u", &show_bihash_verbose); + } + + if ( ! (show_mask_type || show_acl_hash_info || show_applied_info || show_bihash) ) { + /* if no qualifiers specified, show all */ + show_mask_type = 1; + show_acl_hash_info = 1; + show_applied_info = 1; + show_bihash = 1; + } + + if (show_mask_type) { + vlib_cli_output(vm, "Mask-type entries:"); + /* *INDENT-OFF* */ + pool_foreach(mte, am->ace_mask_type_pool, + ({ + vlib_cli_output(vm, " %3d: %016llx %016llx %016llx %016llx %016llx %016llx refcount %d", + mte - am->ace_mask_type_pool, + mte->mask.kv.key[0], mte->mask.kv.key[1], mte->mask.kv.key[2], + mte->mask.kv.key[3], mte->mask.kv.key[4], mte->mask.kv.value, mte->refcount); + })); + /* *INDENT-ON* */ + } + + if (show_acl_hash_info) { + u32 i,j; + u8 * out0 = format(0, ""); + u64 *m; + out0 = format(out0, "Mask-ready ACL representations\n"); + for (i=0; i< vec_len(am->hash_acl_infos); i++) { + if ((acl_index != ~0) && (acl_index != i)) { + continue; + } + hash_acl_info_t *ha = &am->hash_acl_infos[i]; + out0 = format(out0, "acl-index %u bitmask-ready layout\n", i); + out0 = format(out0, " mask type index bitmap: %U\n", format_bitmap_hex, ha->mask_type_index_bitmap); + for(j=0; j<vec_len(ha->rules); j++) { + hash_ace_info_t *pa = &ha->rules[j]; + m = (u64 *)&pa->match; + out0 = format(out0, " %4d: %016llx %016llx %016llx %016llx %016llx %016llx mask index %d acl %d rule %d action %d src/dst portrange not ^2: %d,%d\n", + j, m[0], m[1], m[2], m[3], m[4], m[5], pa->mask_type_index, + pa->acl_index, pa->ace_index, pa->action, + pa->src_portrange_not_powerof2, pa->dst_portrange_not_powerof2); + } + } + vlib_cli_output(vm, "\n%s\n", out0); + vec_free(out0); + } + + if (show_applied_info) { + u32 swi, j; + u8 * out0 = format(0, ""); + out0 = format(out0, "Applied lookup entries for interfaces\n"); + + for(swi = 0; (swi < vec_len(am->input_applied_hash_acl_info_by_sw_if_index)) || + (swi < vec_len(am->output_applied_hash_acl_info_by_sw_if_index)) || + (swi < vec_len(am->input_hash_entry_vec_by_sw_if_index)) || + (swi < vec_len(am->output_hash_entry_vec_by_sw_if_index)); swi++) { + if ((sw_if_index != ~0) && (sw_if_index != swi)) { + continue; + } + out0 = format(out0, "sw_if_index %d:\n", swi); + if (swi < vec_len(am->input_applied_hash_acl_info_by_sw_if_index)) { + applied_hash_acl_info_t *pal = &am->input_applied_hash_acl_info_by_sw_if_index[swi]; + out0 = format(out0, " input lookup mask_type_index_bitmap: %U\n", format_bitmap_hex, pal->mask_type_index_bitmap); + } + if (swi < vec_len(am->input_hash_entry_vec_by_sw_if_index)) { + out0 = format(out0, " input lookup applied entries:\n"); + for(j=0; j<vec_len(am->input_hash_entry_vec_by_sw_if_index[swi]); j++) { + applied_hash_ace_entry_t *pae = &am->input_hash_entry_vec_by_sw_if_index[swi][j]; + out0 = format(out0, " %4d: acl %d rule %d action %d bitmask-ready rule %d next %d prev %d\n", + j, pae->acl_index, pae->ace_index, pae->action, pae->hash_ace_info_index, + pae->next_applied_entry_index, pae->prev_applied_entry_index); + } + } + + if (swi < vec_len(am->output_applied_hash_acl_info_by_sw_if_index)) { + applied_hash_acl_info_t *pal = &am->output_applied_hash_acl_info_by_sw_if_index[swi]; + out0 = format(out0, " output lookup mask_type_index_bitmap: %U\n", format_bitmap_hex, pal->mask_type_index_bitmap); + } + if (swi < vec_len(am->output_hash_entry_vec_by_sw_if_index)) { + out0 = format(out0, " output lookup applied entries:\n"); + for(j=0; j<vec_len(am->output_hash_entry_vec_by_sw_if_index[swi]); j++) { + applied_hash_ace_entry_t *pae = &am->output_hash_entry_vec_by_sw_if_index[swi][j]; + out0 = format(out0, " %4d: acl %d rule %d action %d bitmask-ready rule %d next %d prev %d\n", + j, pae->acl_index, pae->ace_index, pae->action, pae->hash_ace_info_index, + pae->next_applied_entry_index, pae->prev_applied_entry_index); + } + } + + } + vlib_cli_output(vm, "\n%s\n", out0); + vec_free(out0); + } + + if (show_bihash) { + show_hash_acl_hash(vm, am, show_bihash_verbose); + } } return error; } @@ -1870,7 +2197,7 @@ VLIB_CLI_COMMAND (aclplugin_set_command, static) = { VLIB_CLI_COMMAND (aclplugin_show_command, static) = { .path = "show acl-plugin", - .short_help = "show acl-plugin sessions", + .short_help = "show acl-plugin {sessions|acl|interface|tables}", .function = acl_show_aclplugin_fn, }; /* *INDENT-ON* */ @@ -1940,6 +2267,10 @@ acl_init (vlib_main_t * vm) am->l4_match_nonfirst_fragment = 1; + /* use the new fancy hash-based matching */ + // NOT IMMEDIATELY + am->use_hash_acl_matching = 1; + return error; } diff --git a/src/plugins/acl/acl.h b/src/plugins/acl/acl.h index 65bc9e74ead..c9f403e9d1b 100644 --- a/src/plugins/acl/acl.h +++ b/src/plugins/acl/acl.h @@ -24,8 +24,10 @@ #include <vppinfra/error.h> #include <vppinfra/bitmap.h> #include <vppinfra/elog.h> +#include <vppinfra/bihash_48_8.h> #include "bihash_40_8.h" #include "fa_node.h" +#include "hash_lookup_types.h" #define ACL_PLUGIN_VERSION_MAJOR 1 #define ACL_PLUGIN_VERSION_MINOR 3 @@ -109,17 +111,45 @@ typedef struct u32 l2_table_index; } macip_acl_list_t; +/* + * An element describing a particular configuration fo the mask, + * and how many times it has been used. + */ +typedef struct +{ + fa_5tuple_t mask; + u32 refcount; +} ace_mask_type_entry_t; + typedef struct { /* API message ID base */ u16 msg_id_base; acl_list_t *acls; /* Pool of ACLs */ + hash_acl_info_t *hash_acl_infos; /* corresponding hash matching housekeeping info */ + clib_bihash_48_8_t acl_lookup_hash; /* ACL lookup hash table. */ + int acl_lookup_hash_initialized; + applied_hash_ace_entry_t **input_hash_entry_vec_by_sw_if_index; + applied_hash_ace_entry_t **output_hash_entry_vec_by_sw_if_index; + applied_hash_acl_info_t *input_applied_hash_acl_info_by_sw_if_index; + applied_hash_acl_info_t *output_applied_hash_acl_info_by_sw_if_index; + macip_acl_list_t *macip_acls; /* Pool of MAC-IP ACLs */ /* ACLs associated with interfaces */ u32 **input_acl_vec_by_sw_if_index; u32 **output_acl_vec_by_sw_if_index; + /* interfaces on which given ACLs are applied */ + u32 **input_sw_if_index_vec_by_acl; + u32 **output_sw_if_index_vec_by_acl; + + /* Do we use hash-based ACL matching or linear */ + int use_hash_acl_matching; + + /* a pool of all mask types present in all ACEs */ + ace_mask_type_entry_t *ace_mask_type_pool; + /* * Classify tables used to grab the packets for the ACL check, * and serving as the 5-tuple session tables at the same time diff --git a/src/plugins/acl/fa_node.c b/src/plugins/acl/fa_node.c index 66621b6ba78..bfb2fc1eaca 100644 --- a/src/plugins/acl/fa_node.c +++ b/src/plugins/acl/fa_node.c @@ -26,6 +26,7 @@ #include <vppinfra/bihash_template.c> #include "fa_node.h" +#include "hash_lookup.h" typedef struct { @@ -136,7 +137,7 @@ fa_acl_match_port (u16 port, u16 port_first, u16 port_last, int is_ip6) } int -acl_match_5tuple (acl_main_t * am, u32 acl_index, fa_5tuple_t * pkt_5tuple, +single_acl_match_5tuple (acl_main_t * am, u32 acl_index, fa_5tuple_t * pkt_5tuple, int is_ip6, u8 * r_action, u32 * r_acl_match_p, u32 * r_rule_match_p, u32 * trace_bitmap) { @@ -259,7 +260,7 @@ acl_match_5tuple (acl_main_t * am, u32 acl_index, fa_5tuple_t * pkt_5tuple, } static u8 -full_acl_match_5tuple (u32 sw_if_index, fa_5tuple_t * pkt_5tuple, int is_l2, +linear_multi_acl_match_5tuple (u32 sw_if_index, fa_5tuple_t * pkt_5tuple, int is_l2, int is_ip6, int is_input, u32 * acl_match_p, u32 * rule_match_p, u32 * trace_bitmap) { @@ -284,7 +285,7 @@ full_acl_match_5tuple (u32 sw_if_index, fa_5tuple_t * pkt_5tuple, int is_l2, clib_warning ("ACL_FA_NODE_DBG: Trying to match ACL: %d", acl_vector[i]); #endif - if (acl_match_5tuple + if (single_acl_match_5tuple (am, acl_vector[i], pkt_5tuple, is_ip6, &action, acl_match_p, rule_match_p, trace_bitmap)) { @@ -303,6 +304,21 @@ full_acl_match_5tuple (u32 sw_if_index, fa_5tuple_t * pkt_5tuple, int is_l2, return 0; } +static u8 +multi_acl_match_5tuple (u32 sw_if_index, fa_5tuple_t * pkt_5tuple, int is_l2, + int is_ip6, int is_input, u32 * acl_match_p, + u32 * rule_match_p, u32 * trace_bitmap) +{ + acl_main_t *am = &acl_main; + if (am->use_hash_acl_matching) { + return hash_multi_acl_match_5tuple(sw_if_index, pkt_5tuple, is_l2, is_ip6, + is_input, acl_match_p, rule_match_p, trace_bitmap); + } else { + return linear_multi_acl_match_5tuple(sw_if_index, pkt_5tuple, is_l2, is_ip6, + is_input, acl_match_p, rule_match_p, trace_bitmap); + } +} + static int offset_within_packet (vlib_buffer_t * b0, int offset) { @@ -973,6 +989,10 @@ acl_fa_node_fn (vlib_main_t * vm, acl_fill_5tuple (am, b0, is_ip6, is_input, is_l2_path, &fa_5tuple); fa_5tuple.l4.lsb_of_sw_if_index = sw_if_index0 & 0xffff; acl_make_5tuple_session_key (is_input, &fa_5tuple, &kv_sess); + fa_5tuple.pkt.sw_if_index = sw_if_index0; + fa_5tuple.pkt.is_ip6 = is_ip6; + fa_5tuple.pkt.is_input = is_input; + fa_5tuple.pkt.mask_type_index_lsb = ~0; #ifdef FA_NODE_VERBOSE_DEBUG clib_warning ("ACL_FA_NODE_DBG: session 5-tuple %016llx %016llx %016llx %016llx %016llx : %016llx", @@ -1039,7 +1059,7 @@ acl_fa_node_fn (vlib_main_t * vm, if (acl_check_needed) { action = - full_acl_match_5tuple (sw_if_index0, &fa_5tuple, is_l2_path, + multi_acl_match_5tuple (sw_if_index0, &fa_5tuple, is_l2_path, is_ip6, is_input, &match_acl_in_index, &match_rule_index, &trace_bitmap); error0 = action; @@ -1590,6 +1610,17 @@ acl_fa_enable_disable (u32 sw_if_index, int is_input, int enable_disable) } } +void +show_fa_sessions_hash(vlib_main_t * vm, u32 verbose) +{ + acl_main_t *am = &acl_main; + if (am->fa_sessions_hash_is_initialized) { + vlib_cli_output(vm, "\nSession lookup hash table:\n%U\n\n", + BV (format_bihash), &am->fa_sessions_hash, verbose); + } else { + vlib_cli_output(vm, "\nSession lookup hash table is not allocated.\n\n"); + } +} /* *INDENT-OFF* */ diff --git a/src/plugins/acl/fa_node.h b/src/plugins/acl/fa_node.h index 671593a8c99..e4cd2ab57d8 100644 --- a/src/plugins/acl/fa_node.h +++ b/src/plugins/acl/fa_node.h @@ -22,12 +22,15 @@ typedef union { u64 as_u64; struct { + u32 sw_if_index; + u16 mask_type_index_lsb; u8 tcp_flags; u8 tcp_flags_valid:1; u8 is_input:1; u8 l4_valid:1; u8 is_nonfirst_fragment:1; - u8 flags_reserved:4; + u8 is_ip6:1; + u8 flags_reserved:3; }; } fa_packet_info_t; @@ -158,5 +161,7 @@ enum void acl_fa_enable_disable(u32 sw_if_index, int is_input, int enable_disable); +void show_fa_sessions_hash(vlib_main_t * vm, u32 verbose); + #endif diff --git a/src/plugins/acl/hash_lookup.c b/src/plugins/acl/hash_lookup.c new file mode 100644 index 00000000000..8e8c52740ee --- /dev/null +++ b/src/plugins/acl/hash_lookup.c @@ -0,0 +1,742 @@ +/* + *------------------------------------------------------------------ + * Copyright (c) 2017 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 <stddef.h> +#include <netinet/in.h> + +#include <vlibapi/api.h> +#include <vlibmemory/api.h> +#include <vlibsocket/api.h> + +#include <vlib/vlib.h> +#include <vnet/vnet.h> +#include <vnet/pg/pg.h> +#include <vppinfra/error.h> +#include <vnet/plugin/plugin.h> +#include <acl/acl.h> +#include <vppinfra/bihash_48_8.h> + +#include "hash_lookup.h" +#include "hash_lookup_private.h" + +/* + * This returns true if there is indeed a match on the portranges. + * With all these levels of indirections, this is not going to be very fast, + * so, best use the individual ports or wildcard ports for performance. + */ +static int +match_portranges(acl_main_t *am, fa_5tuple_t *match, u32 index) +{ + applied_hash_ace_entry_t **applied_hash_aces = match->pkt.is_input ? &am->input_hash_entry_vec_by_sw_if_index[match->pkt.sw_if_index] : + &am->output_hash_entry_vec_by_sw_if_index[match->pkt.sw_if_index]; + applied_hash_ace_entry_t *pae = &((*applied_hash_aces)[index]); + + // hash_acl_info_t *ha = &am->hash_acl_infos[pae->acl_index]; + acl_rule_t *r = &(am->acls[pae->acl_index].rules[pae->ace_index]); + DBG("PORTMATCH: %d <= %d <= %d && %d <= %d <= %d ?", + r->src_port_or_type_first, match->l4.port[0], r->src_port_or_type_last, + r->dst_port_or_code_first, match->l4.port[1], r->dst_port_or_code_last); + + return ( ((r->src_port_or_type_first <= match->l4.port[0]) && r->src_port_or_type_last >= match->l4.port[0]) && + ((r->dst_port_or_code_first <= match->l4.port[1]) && r->dst_port_or_code_last >= match->l4.port[1]) ); +} + +static u32 +multi_acl_match_get_applied_ace_index(acl_main_t *am, fa_5tuple_t *match) +{ + clib_bihash_kv_48_8_t kv; + clib_bihash_kv_48_8_t result; + fa_5tuple_t *kv_key = (fa_5tuple_t *)kv.key; + hash_acl_lookup_value_t *result_val = (hash_acl_lookup_value_t *)&result.value; + u64 *pmatch = (u64 *)match; + u64 *pmask; + u64 *pkey; + int mask_type_index; + u32 curr_match_index = ~0; + + u32 sw_if_index = match->pkt.sw_if_index; + u8 is_input = match->pkt.is_input; + applied_hash_ace_entry_t **applied_hash_aces = is_input ? &am->input_hash_entry_vec_by_sw_if_index[sw_if_index] : + &am->output_hash_entry_vec_by_sw_if_index[sw_if_index]; + applied_hash_acl_info_t **applied_hash_acls = is_input ? &am->input_applied_hash_acl_info_by_sw_if_index : + &am->output_applied_hash_acl_info_by_sw_if_index; + + DBG("TRYING TO MATCH: %016llx %016llx %016llx %016llx %016llx %016llx", + pmatch[0], pmatch[1], pmatch[2], pmatch[3], pmatch[4], pmatch[5]); + + for(mask_type_index=0; mask_type_index < pool_len(am->ace_mask_type_pool); mask_type_index++) { + if (!clib_bitmap_get((*applied_hash_acls)[sw_if_index].mask_type_index_bitmap, mask_type_index)) { + /* This bit is not set. Avoid trying to match */ + continue; + } + ace_mask_type_entry_t *mte = &am->ace_mask_type_pool[mask_type_index]; + pmatch = (u64 *)match; + pmask = (u64 *)&mte->mask; + pkey = (u64 *)kv.key; + /* + * unrolling the below loop results in a noticeable performance increase. + int i; + for(i=0; i<6; i++) { + kv.key[i] = pmatch[i] & pmask[i]; + } + */ + + *pkey++ = *pmatch++ & *pmask++; + *pkey++ = *pmatch++ & *pmask++; + *pkey++ = *pmatch++ & *pmask++; + *pkey++ = *pmatch++ & *pmask++; + *pkey++ = *pmatch++ & *pmask++; + *pkey++ = *pmatch++ & *pmask++; + + kv_key->pkt.mask_type_index_lsb = mask_type_index; + DBG(" KEY %3d: %016llx %016llx %016llx %016llx %016llx %016llx", mask_type_index, + kv.key[0], kv.key[1], kv.key[2], kv.key[3], kv.key[4], kv.key[5]); + int res = BV (clib_bihash_search) (&am->acl_lookup_hash, &kv, &result); + if (res == 0) { + DBG("ACL-MATCH! result_val: %016llx", result_val->as_u64); + if (result_val->applied_entry_index < curr_match_index) { + if (PREDICT_FALSE(result_val->need_portrange_check)) { + /* + * This is going to be slow, since we can have multiple superset + * entries for narrow-ish portranges, e.g.: + * 0..42 100..400, 230..60000, + * so we need to walk linearly and check if they match. + */ + + u32 curr_index = result_val->applied_entry_index; + while ((curr_index != ~0) && !match_portranges(am, match, curr_index)) { + /* while no match and there are more entries, walk... */ + applied_hash_ace_entry_t *pae = &((*applied_hash_aces)[curr_index]); + DBG("entry %d did not portmatch, advancing to %d", curr_index, pae->next_applied_entry_index); + curr_index = pae->next_applied_entry_index; + } + if (curr_index < curr_match_index) { + DBG("The index %d is the new candidate in portrange matches.", curr_index); + curr_match_index = result_val->applied_entry_index; + if (!result_val->shadowed) { + /* new result is known to not be shadowed, so no point to look up further */ + break; + } + } else { + DBG("Curr portmatch index %d is too big vs. current matched one %d", curr_index, curr_match_index); + } + } else { + /* The usual path is here. Found an entry in front of the current candiate - so it's a new one */ + DBG("This match is the new candidate"); + curr_match_index = result_val->applied_entry_index; + if (!result_val->shadowed) { + /* new result is known to not be shadowed, so no point to look up further */ + break; + } + } + } + } + } + DBG("MATCH-RESULT: %d", curr_match_index); + return curr_match_index; +} + +static void +hashtable_add_del(acl_main_t *am, clib_bihash_kv_48_8_t *kv, int is_add) +{ + DBG("HASH ADD/DEL: %016llx %016llx %016llx %016llx %016llx %016llx add %d", + kv->key[0], kv->key[1], kv->key[2], + kv->key[3], kv->key[4], kv->key[5], is_add); + BV (clib_bihash_add_del) (&am->acl_lookup_hash, kv, is_add); +} + +static void +fill_applied_hash_ace_kv(acl_main_t *am, + applied_hash_ace_entry_t **applied_hash_aces, + u32 sw_if_index, u8 is_input, + u32 new_index, clib_bihash_kv_48_8_t *kv) +{ + fa_5tuple_t *kv_key = (fa_5tuple_t *)kv->key; + hash_acl_lookup_value_t *kv_val = (hash_acl_lookup_value_t *)&kv->value; + applied_hash_ace_entry_t *pae = &((*applied_hash_aces)[new_index]); + hash_acl_info_t *ha = &am->hash_acl_infos[pae->acl_index]; + + memcpy(kv_key, &ha->rules[pae->hash_ace_info_index].match, sizeof(*kv_key)); + /* initialize the sw_if_index and direction */ + kv_key->pkt.sw_if_index = sw_if_index; + kv_key->pkt.is_input = is_input; + kv_val->as_u64 = 0; + kv_val->applied_entry_index = new_index; + kv_val->need_portrange_check = ha->rules[pae->hash_ace_info_index].src_portrange_not_powerof2 || + ha->rules[pae->hash_ace_info_index].dst_portrange_not_powerof2; + /* by default assume all values are shadowed -> check all mask types */ + kv_val->shadowed = 1; +} + +static void +add_del_hashtable_entry(acl_main_t *am, + u32 sw_if_index, u8 is_input, + applied_hash_ace_entry_t **applied_hash_aces, + u32 index, int is_add) +{ + clib_bihash_kv_48_8_t kv; + + fill_applied_hash_ace_kv(am, applied_hash_aces, sw_if_index, is_input, index, &kv); + hashtable_add_del(am, &kv, is_add); +} + + + +static void +activate_applied_ace_hash_entry(acl_main_t *am, + u32 sw_if_index, u8 is_input, + applied_hash_ace_entry_t **applied_hash_aces, + u32 new_index) +{ + clib_bihash_kv_48_8_t kv; + applied_hash_ace_entry_t *pae = &((*applied_hash_aces)[new_index]); + + fill_applied_hash_ace_kv(am, applied_hash_aces, sw_if_index, is_input, new_index, &kv); + + DBG("APPLY ADD KY: %016llx %016llx %016llx %016llx %016llx %016llx", + kv.key[0], kv.key[1], kv.key[2], + kv.key[3], kv.key[4], kv.key[5]); + + clib_bihash_kv_48_8_t result; + hash_acl_lookup_value_t *result_val = (hash_acl_lookup_value_t *)&result.value; + int res = BV (clib_bihash_search) (&am->acl_lookup_hash, &kv, &result); + if (res == 0) { + /* There already exists an entry or more. Append at the end. */ + u32 existing_index = result_val->applied_entry_index; + DBG("A key already exists, with applied entry index: %d", existing_index); + ASSERT(existing_index != ~0); + applied_hash_ace_entry_t *existing_pae = &((*applied_hash_aces)[existing_index]); + /* walk the list to the last element */ + while (existing_pae->next_applied_entry_index != ~0) { + if (existing_index == existing_pae->next_applied_entry_index) { + DBG("existing and next index of entry %d are the same, abort", existing_index); + ASSERT(existing_index != existing_pae->next_applied_entry_index); + } + existing_index = existing_pae->next_applied_entry_index; + existing_pae = &((*applied_hash_aces)[existing_index]); + DBG("...advance to chained entry index: %d", existing_index); + } + /* link ourseves in */ + existing_pae->next_applied_entry_index = new_index; + pae->prev_applied_entry_index = existing_index; + } else { + /* It's the very first entry */ + hashtable_add_del(am, &kv, 1); + } +} + +static void +applied_hash_entries_analyze(acl_main_t *am, applied_hash_ace_entry_t **applied_hash_aces) +{ + /* + * Go over the rules and check which ones are shadowed and which aren't. + * Naive approach: try to match the match value from every ACE as if it + * was a live packet, and see if the resulting match happens earlier in the list. + * if it does not match or it is later in the ACL - then the entry is not shadowed. + * + * This approach fails, an example: + * deny tcp 2001:db8::/32 2001:db8::/32 + * permit ip 2001:db8::1/128 2001:db8::2/128 + */ +} + +void +hash_acl_apply(acl_main_t *am, u32 sw_if_index, u8 is_input, int acl_index) +{ + int i; + + DBG("HASH ACL apply: sw_if_index %d is_input %d acl %d", sw_if_index, is_input, acl_index); + u32 *acl_vec = is_input ? am->input_acl_vec_by_sw_if_index[sw_if_index] : + am->output_acl_vec_by_sw_if_index[sw_if_index]; + if (is_input) { + vec_validate(am->input_hash_entry_vec_by_sw_if_index, sw_if_index); + } else { + vec_validate(am->output_hash_entry_vec_by_sw_if_index, sw_if_index); + } + vec_validate(am->hash_acl_infos, acl_index); + applied_hash_ace_entry_t **applied_hash_aces = is_input ? &am->input_hash_entry_vec_by_sw_if_index[sw_if_index] : + &am->output_hash_entry_vec_by_sw_if_index[sw_if_index]; + u32 order_index = vec_search(acl_vec, acl_index); + hash_acl_info_t *ha = &am->hash_acl_infos[acl_index]; + ASSERT(order_index != ~0); + + if (!am->acl_lookup_hash_initialized) { + BV (clib_bihash_init) (&am->acl_lookup_hash, "ACL plugin rule lookup bihash", + 65536, 2 << 25); + am->acl_lookup_hash_initialized = 1; + } + int base_offset = vec_len(*applied_hash_aces); + + /* Update the bitmap of the mask types with which the lookup + needs to happen for the ACLs applied to this sw_if_index */ + applied_hash_acl_info_t **applied_hash_acls = is_input ? &am->input_applied_hash_acl_info_by_sw_if_index : + &am->output_applied_hash_acl_info_by_sw_if_index; + vec_validate((*applied_hash_acls), sw_if_index); + applied_hash_acl_info_t *pal = &(*applied_hash_acls)[sw_if_index]; + pal->mask_type_index_bitmap = clib_bitmap_or(pal->mask_type_index_bitmap, + ha->mask_type_index_bitmap); + /* + * if the applied ACL is empty, the current code will cause a + * different behavior compared to current linear search: an empty ACL will + * simply fallthrough to the next ACL, or the default deny in the end. + * + * This is not a problem, because after vpp-dev discussion, + * the consensus was it should not be possible to apply the non-existent + * ACL, so the change adding this code also takes care of that. + */ + + /* expand the applied aces vector by the necessary amount */ + vec_resize((*applied_hash_aces), vec_len(ha->rules)); + + /* add the rules from the ACL to the hash table for lookup and append to the vector*/ + for(i=0; i < vec_len(ha->rules); i++) { + u32 new_index = base_offset + i; + applied_hash_ace_entry_t *pae = &((*applied_hash_aces)[new_index]); + pae->acl_index = acl_index; + pae->ace_index = ha->rules[i].ace_index; + pae->action = ha->rules[i].action; + pae->hash_ace_info_index = i; + /* we might link it in later */ + pae->next_applied_entry_index = ~0; + pae->prev_applied_entry_index = ~0; + activate_applied_ace_hash_entry(am, sw_if_index, is_input, applied_hash_aces, new_index); + } + applied_hash_entries_analyze(am, applied_hash_aces); +} + +static void +move_applied_ace_hash_entry(acl_main_t *am, + u32 sw_if_index, u8 is_input, + applied_hash_ace_entry_t **applied_hash_aces, + u32 old_index, u32 new_index) +{ + + /* move the entry */ + (*applied_hash_aces)[new_index] = (*applied_hash_aces)[old_index]; + + /* update the linkage and hash table if necessary */ + applied_hash_ace_entry_t *pae = &((*applied_hash_aces)[old_index]); + + if (pae->prev_applied_entry_index != ~0) { + applied_hash_ace_entry_t *prev_pae = &((*applied_hash_aces)[pae->prev_applied_entry_index]); + ASSERT(prev_pae->next_applied_entry_index == old_index); + prev_pae->next_applied_entry_index = new_index; + } else { + /* first entry - so the hash points to it, update */ + add_del_hashtable_entry(am, sw_if_index, is_input, + applied_hash_aces, new_index, 1); + } + if (pae->next_applied_entry_index != ~0) { + applied_hash_ace_entry_t *next_pae = &((*applied_hash_aces)[pae->next_applied_entry_index]); + ASSERT(next_pae->prev_applied_entry_index == old_index); + next_pae->prev_applied_entry_index = new_index; + } + /* invalidate the old entry */ + pae->prev_applied_entry_index = ~0; + pae->next_applied_entry_index = ~0; +} + +static void +deactivate_applied_ace_hash_entry(acl_main_t *am, + u32 sw_if_index, u8 is_input, + applied_hash_ace_entry_t **applied_hash_aces, + u32 old_index) +{ + applied_hash_ace_entry_t *pae = &((*applied_hash_aces)[old_index]); + + if (pae->next_applied_entry_index != ~0) { + applied_hash_ace_entry_t *next_pae = &((*applied_hash_aces)[pae->next_applied_entry_index]); + ASSERT(next_pae->prev_applied_entry_index == old_index); + next_pae->prev_applied_entry_index = pae->prev_applied_entry_index; + } + + if (pae->prev_applied_entry_index != ~0) { + applied_hash_ace_entry_t *prev_pae = &((*applied_hash_aces)[pae->prev_applied_entry_index]); + ASSERT(prev_pae->next_applied_entry_index == old_index); + prev_pae->next_applied_entry_index = pae->next_applied_entry_index; + } else { + /* It was the first entry. We need either to reset the hash entry or delete it */ + if (pae->next_applied_entry_index != ~0) { + add_del_hashtable_entry(am, sw_if_index, is_input, + applied_hash_aces, pae->next_applied_entry_index, 1); + } else { + /* no next entry, so just delete the entry in the hash table */ + add_del_hashtable_entry(am, sw_if_index, is_input, + applied_hash_aces, old_index, 0); + } + } +} + + +static void +hash_acl_build_applied_lookup_bitmap(acl_main_t *am, u32 sw_if_index, u8 is_input) +{ + int i; + uword *new_lookup_bitmap = 0; + u32 **applied_acls = is_input ? &am->input_acl_vec_by_sw_if_index[sw_if_index] : + &am->output_acl_vec_by_sw_if_index[sw_if_index]; + applied_hash_acl_info_t **applied_hash_acls = is_input ? &am->input_applied_hash_acl_info_by_sw_if_index : + &am->output_applied_hash_acl_info_by_sw_if_index; + applied_hash_acl_info_t *pal = &(*applied_hash_acls)[sw_if_index]; + for(i=0; i < vec_len(*applied_acls); i++) { + u32 a_acl_index = (*applied_acls)[i]; + hash_acl_info_t *ha = &am->hash_acl_infos[a_acl_index]; + new_lookup_bitmap = clib_bitmap_or(new_lookup_bitmap, + ha->mask_type_index_bitmap); + } + uword *old_lookup_bitmap = pal->mask_type_index_bitmap; + pal->mask_type_index_bitmap = new_lookup_bitmap; + clib_bitmap_free(old_lookup_bitmap); +} + +void +hash_acl_unapply(acl_main_t *am, u32 sw_if_index, u8 is_input, int acl_index) +{ + int i; + + DBG("HASH ACL unapply: sw_if_index %d is_input %d acl %d", sw_if_index, is_input, acl_index); + hash_acl_info_t *ha = &am->hash_acl_infos[acl_index]; + applied_hash_ace_entry_t **applied_hash_aces = is_input ? &am->input_hash_entry_vec_by_sw_if_index[sw_if_index] : + &am->output_hash_entry_vec_by_sw_if_index[sw_if_index]; + + for(i=0; i < vec_len((*applied_hash_aces)); i++) { + if ((*applied_hash_aces)[i].acl_index == acl_index) { + DBG("Found applied ACL#%d at applied index %d", acl_index, i); + break; + } + } + if (vec_len((*applied_hash_aces)) <= i) { + DBG("Did not find applied ACL#%d at sw_if_index %d", acl_index, sw_if_index); + /* we went all the way without finding any entries. Probably a list was empty. */ + return; + } + int base_offset = i; + int tail_offset = base_offset + vec_len(ha->rules); + int tail_len = vec_len((*applied_hash_aces)) - tail_offset; + DBG("base_offset: %d, tail_offset: %d, tail_len: %d", base_offset, tail_offset, tail_len); + + for(i=0; i < vec_len(ha->rules); i ++) { + DBG("UNAPPLY DEACTIVATE: sw_if_index %d is_input %d, applied index %d", sw_if_index, is_input, base_offset + i); + deactivate_applied_ace_hash_entry(am, sw_if_index, is_input, + applied_hash_aces, base_offset + i); + } + for(i=0; i < tail_len; i ++) { + /* move the entry at tail offset to base offset */ + /* that is, from (tail_offset+i) -> (base_offset+i) */ + DBG("UNAPPLY MOVE: sw_if_index %d is_input %d, applied index %d ->", sw_if_index, is_input, tail_offset+i, base_offset + i); + move_applied_ace_hash_entry(am, sw_if_index, is_input, applied_hash_aces, tail_offset + i, base_offset + i); + } + /* trim the end of the vector */ + _vec_len((*applied_hash_aces)) -= vec_len(ha->rules); + + applied_hash_entries_analyze(am, applied_hash_aces); + + /* After deletion we might not need some of the mask-types anymore... */ + hash_acl_build_applied_lookup_bitmap(am, sw_if_index, is_input); +} + +/* + * Create the applied ACEs and update the hash table, + * taking into account that the ACL may not be the last + * in the vector of applied ACLs. + * + * For now, walk from the end of the vector and unapply the ACLs, + * then apply the one in question and reapply the rest. + */ + +void +hash_acl_reapply(acl_main_t *am, u32 sw_if_index, u8 is_input, int acl_index) +{ + u32 **applied_acls = is_input ? &am->input_acl_vec_by_sw_if_index[sw_if_index] : + &am->output_acl_vec_by_sw_if_index[sw_if_index]; + int i; + int start_index = vec_search((*applied_acls), acl_index); + /* + * This function is called after we find out the sw_if_index where ACL is applied. + * If the by-sw_if_index vector does not have the ACL#, then it's a bug. + */ + ASSERT(start_index < vec_len(*applied_acls)); + + /* unapply all the ACLs till the current one */ + for(i = vec_len(*applied_acls) - 1; i >= start_index; i--) { + hash_acl_unapply(am, sw_if_index, is_input, (*applied_acls)[i]); + } + for(i = start_index; i < vec_len(*applied_acls); i++) { + hash_acl_apply(am, sw_if_index, is_input, (*applied_acls)[i]); + } +} + +static void +make_address_mask(ip46_address_t *addr, u8 is_ipv6, u8 prefix_len) +{ + if (is_ipv6) { + ip6_address_mask_from_width(&addr->ip6, prefix_len); + } else { + /* FIXME: this may not be correct way */ + ip6_address_mask_from_width(&addr->ip6, prefix_len + 3*32); + ip46_address_mask_ip4(addr); + } +} + +static u8 +make_port_mask(u16 *portmask, u16 port_first, u16 port_last) +{ + if (port_first == port_last) { + *portmask = 0xffff; + /* single port is representable by masked value */ + return 0; + } + if ((port_first == 0) && (port_last == 65535)) { + *portmask = 0; + /* wildcard port is representable by a masked value */ + return 0; + } + + /* + * For now match all the ports, later + * here might be a better optimization which would + * pick out bitmaskable portranges. + * + * However, adding a new mask type potentially + * adds a per-packet extra lookup, so the benefit is not clear. + */ + *portmask = 0; + /* This port range can't be represented via bitmask exactly. */ + return 1; +} + +static void +make_mask_and_match_from_rule(fa_5tuple_t *mask, acl_rule_t *r, hash_ace_info_t *hi, int match_nonfirst_fragment) +{ + memset(mask, 0, sizeof(*mask)); + memset(&hi->match, 0, sizeof(hi->match)); + hi->action = r->is_permit; + + /* we will need to be matching based on sw_if_index, direction, and mask_type_index when applied */ + mask->pkt.sw_if_index = ~0; + mask->pkt.is_input = 1; + /* we will assign the match of mask_type_index later when we find it*/ + mask->pkt.mask_type_index_lsb = ~0; + + mask->pkt.is_ip6 = 1; + hi->match.pkt.is_ip6 = r->is_ipv6; + + make_address_mask(&mask->addr[0], r->is_ipv6, r->src_prefixlen); + hi->match.addr[0] = r->src; + make_address_mask(&mask->addr[1], r->is_ipv6, r->dst_prefixlen); + hi->match.addr[1] = r->dst; + + if (r->proto != 0) { + mask->l4.proto = ~0; /* L4 proto needs to be matched */ + hi->match.l4.proto = r->proto; + if (match_nonfirst_fragment) { + /* match the non-first fragments only */ + mask->pkt.is_nonfirst_fragment = 1; + hi->match.pkt.is_nonfirst_fragment = 1; + } else { + /* Calculate the src/dst port masks and make the src/dst port matches accordingly */ + hi->src_portrange_not_powerof2 = make_port_mask(&mask->l4.port[0], r->src_port_or_type_first, r->src_port_or_type_last); + hi->match.l4.port[0] = r->src_port_or_type_first & mask->l4.port[0]; + hi->dst_portrange_not_powerof2 = make_port_mask(&mask->l4.port[1], r->dst_port_or_code_first, r->dst_port_or_code_last); + hi->match.l4.port[1] = r->dst_port_or_code_first & mask->l4.port[1]; + /* L4 info must be valid in order to match */ + mask->pkt.l4_valid = 1; + hi->match.pkt.l4_valid = 1; + /* And we must set the mask to check that it is an initial fragment */ + mask->pkt.is_nonfirst_fragment = 1; + hi->match.pkt.is_nonfirst_fragment = 0; + if ((r->proto == IPPROTO_TCP) && (r->tcp_flags_mask != 0)) { + /* if we want to match on TCP flags, they must be masked off as well */ + mask->pkt.tcp_flags = r->tcp_flags_mask; + hi->match.pkt.tcp_flags = r->tcp_flags_value; + /* and the flags need to be present within the packet being matched */ + mask->pkt.tcp_flags_valid = 1; + hi->match.pkt.tcp_flags_valid = 1; + } + } + } + /* Sanitize the mask and the match */ + u64 *pmask = (u64 *)mask; + u64 *pmatch = (u64 *)&hi->match; + int j; + for(j=0; j<6; j++) { + pmatch[j] = pmatch[j] & pmask[j]; + } +} + +static u32 +find_mask_type_index(acl_main_t *am, fa_5tuple_t *mask) +{ + ace_mask_type_entry_t *mte; + /* *INDENT-OFF* */ + pool_foreach(mte, am->ace_mask_type_pool, + ({ + if(memcmp(&mte->mask, mask, sizeof(*mask)) == 0) + return (mte - am->ace_mask_type_pool); + })); + /* *INDENT-ON* */ + return ~0; +} + +static u32 +assign_mask_type_index(acl_main_t *am, fa_5tuple_t *mask) +{ + u32 mask_type_index = find_mask_type_index(am, mask); + ace_mask_type_entry_t *mte; + if(~0 == mask_type_index) { + pool_get_aligned (am->ace_mask_type_pool, mte, CLIB_CACHE_LINE_BYTES); + mask_type_index = mte - am->ace_mask_type_pool; + clib_memcpy(&mte->mask, mask, sizeof(mte->mask)); + mte->refcount = 0; + /* + * We can use only 16 bits, since in the match there is only u16 field. + * Realistically, once you go to 64K of mask types, it is a huge + * problem anyway, so we might as well stop half way. + */ + ASSERT(mask_type_index < 32768); + } + mte = am->ace_mask_type_pool + mask_type_index; + mte->refcount++; + return mask_type_index; +} + +static void +release_mask_type_index(acl_main_t *am, u32 mask_type_index) +{ + ace_mask_type_entry_t *mte = &am->ace_mask_type_pool[mask_type_index]; + mte->refcount--; + if (mte->refcount == 0) { + /* we are not using this entry anymore */ + pool_put(am->ace_mask_type_pool, mte); + } +} + +void hash_acl_add(acl_main_t *am, int acl_index) +{ + DBG("HASH ACL add : %d", acl_index); + int i; + acl_list_t *a = &am->acls[acl_index]; + vec_validate(am->hash_acl_infos, acl_index); + hash_acl_info_t *ha = &am->hash_acl_infos[acl_index]; + memset(ha, 0, sizeof(*ha)); + + /* walk the newly added ACL entries and ensure that for each of them there + is a mask type, increment a reference count for that mask type */ + for(i=0; i < a->count; i++) { + hash_ace_info_t ace_info; + fa_5tuple_t mask; + memset(&ace_info, 0, sizeof(ace_info)); + ace_info.acl_index = acl_index; + ace_info.ace_index = i; + + make_mask_and_match_from_rule(&mask, &a->rules[i], &ace_info, 0); + ace_info.mask_type_index = assign_mask_type_index(am, &mask); + /* assign the mask type index for matching itself */ + ace_info.match.pkt.mask_type_index_lsb = ace_info.mask_type_index; + DBG("ACE: %d mask_type_index: %d", i, ace_info.mask_type_index); + /* Ensure a given index is set in the mask type index bitmap for this ACL */ + ha->mask_type_index_bitmap = clib_bitmap_set(ha->mask_type_index_bitmap, ace_info.mask_type_index, 1); + vec_add1(ha->rules, ace_info); + if (am->l4_match_nonfirst_fragment) { + /* add the second rule which matches the noninitial fragments with the respective mask */ + make_mask_and_match_from_rule(&mask, &a->rules[i], &ace_info, 1); + ace_info.mask_type_index = assign_mask_type_index(am, &mask); + ace_info.match.pkt.mask_type_index_lsb = ace_info.mask_type_index; + DBG("ACE: %d (non-initial frags) mask_type_index: %d", i, ace_info.mask_type_index); + /* Ensure a given index is set in the mask type index bitmap for this ACL */ + ha->mask_type_index_bitmap = clib_bitmap_set(ha->mask_type_index_bitmap, ace_info.mask_type_index, 1); + vec_add1(ha->rules, ace_info); + } + } + /* + * if an ACL is applied somewhere, fill the corresponding lookup data structures. + * We need to take care if the ACL is not the last one in the vector of ACLs applied to the interface. + */ + if (acl_index < vec_len(am->input_sw_if_index_vec_by_acl)) { + u32 *sw_if_index; + vec_foreach(sw_if_index, am->input_sw_if_index_vec_by_acl[acl_index]) { + hash_acl_reapply(am, *sw_if_index, 1, acl_index); + } + } + if (acl_index < vec_len(am->output_sw_if_index_vec_by_acl)) { + u32 *sw_if_index; + vec_foreach(sw_if_index, am->output_sw_if_index_vec_by_acl[acl_index]) { + hash_acl_reapply(am, *sw_if_index, 0, acl_index); + } + } +} + +void hash_acl_delete(acl_main_t *am, int acl_index) +{ + DBG("HASH ACL delete : %d", acl_index); + /* + * If the ACL is applied somewhere, remove the references of it (call hash_acl_unapply) + * this is a different behavior from the linear lookup where an empty ACL is "deny all", + * + * However, following vpp-dev discussion the ACL that is referenced elsewhere + * should not be possible to delete, and the change adding this also adds + * the safeguards to that respect, so this is not a problem. + */ + if (acl_index < vec_len(am->input_sw_if_index_vec_by_acl)) { + u32 *sw_if_index; + vec_foreach(sw_if_index, am->input_sw_if_index_vec_by_acl[acl_index]) { + hash_acl_unapply(am, *sw_if_index, 1, acl_index); + } + } + if (acl_index < vec_len(am->output_sw_if_index_vec_by_acl)) { + u32 *sw_if_index; + vec_foreach(sw_if_index, am->output_sw_if_index_vec_by_acl[acl_index]) { + hash_acl_unapply(am, *sw_if_index, 0, acl_index); + } + } + + /* walk the mask types for the ACL about-to-be-deleted, and decrease + * the reference count, possibly freeing up some of them */ + int i; + hash_acl_info_t *ha = &am->hash_acl_infos[acl_index]; + for(i=0; i < vec_len(ha->rules); i++) { + release_mask_type_index(am, ha->rules[i].mask_type_index); + } + clib_bitmap_free(ha->mask_type_index_bitmap); + vec_free(ha->rules); +} + +u8 +hash_multi_acl_match_5tuple (u32 sw_if_index, fa_5tuple_t * pkt_5tuple, int is_l2, + int is_ip6, int is_input, u32 * acl_match_p, + u32 * rule_match_p, u32 * trace_bitmap) +{ + acl_main_t *am = &acl_main; + applied_hash_ace_entry_t **applied_hash_aces = is_input ? &am->input_hash_entry_vec_by_sw_if_index[sw_if_index] : + &am->output_hash_entry_vec_by_sw_if_index[sw_if_index]; + u32 match_index = multi_acl_match_get_applied_ace_index(am, pkt_5tuple); + if (match_index < vec_len((*applied_hash_aces))) { + applied_hash_ace_entry_t *pae = &((*applied_hash_aces)[match_index]); + *acl_match_p = pae->acl_index; + *rule_match_p = pae->ace_index; + return pae->action; + } + return 0; +} + + +void +show_hash_acl_hash (vlib_main_t * vm, acl_main_t *am, u32 verbose) +{ + vlib_cli_output(vm, "\nACL lookup hash table:\n%U\n", + BV (format_bihash), &am->acl_lookup_hash, verbose); +} diff --git a/src/plugins/acl/hash_lookup.h b/src/plugins/acl/hash_lookup.h new file mode 100644 index 00000000000..c5913624f81 --- /dev/null +++ b/src/plugins/acl/hash_lookup.h @@ -0,0 +1,60 @@ +/* + *------------------------------------------------------------------ + * Copyright (c) 2017 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 _ACL_HASH_LOOKUP_H_ +#define _ACL_HASH_LOOKUP_H_ + +#include <stddef.h> +#include "acl.h" + +/* + * Do the necessary to logically apply the ACL to the existing vector of ACLs looked up + * during the packet processing + */ + +void hash_acl_apply(acl_main_t *am, u32 sw_if_index, u8 is_input, int acl_index); + +/* Remove the ACL from the packet processing lookups on a given interface */ + +void hash_acl_unapply(acl_main_t *am, u32 sw_if_index, u8 is_input, int acl_index); + +/* + * Add an ACL or delete an ACL. ACL may already have been referenced elsewhere, + * so potentially we also need to do the work to enable the lookups. + */ + +void hash_acl_add(acl_main_t *am, int acl_index); +void hash_acl_delete(acl_main_t *am, int acl_index); + +/* + * Do the work required to match a given 5-tuple from the packet, + * and return the action as well as populate the values pointed + * to by the *_match_p pointers and maybe trace_bitmap. + */ + +u8 +hash_multi_acl_match_5tuple (u32 sw_if_index, fa_5tuple_t * pkt_5tuple, int is_l2, + int is_ip6, int is_input, u32 * acl_match_p, + u32 * rule_match_p, u32 * trace_bitmap); + + +/* + * The debug function to show the contents of the ACL lookup hash + */ +void show_hash_acl_hash(vlib_main_t * vm, acl_main_t *am, u32 verbose); + +#endif diff --git a/src/plugins/acl/hash_lookup.md b/src/plugins/acl/hash_lookup.md new file mode 100644 index 00000000000..95524643e25 --- /dev/null +++ b/src/plugins/acl/hash_lookup.md @@ -0,0 +1,241 @@ +ACL plugin constant-time lookup design +====================================== + +The initial implementation of ACL plugin performs a trivial for() cycle, +going through the assigned ACLs on a per-packet basis. This is not very +efficient, even if for very short ACLs due to its simplicity it can beat +more advanced methods. + +However, to cover the case of longer ACLs with acceptable performance, +we need to have a better way of matching. This write-up proposes +a mechanism to make a lookup from O(M) where M is number of entries +to O(N) where N is number of different mask combinations. + +Preparation of ACL(s) +--------------------- + +The ACL plugin will maintain a global list of "mask types", i.e. the specific +configurations of "do not care" bits within the ACEs. +Upon the creation of a new ACL, a pass will be made through all the +ACEs, to assign and possibly allocate the "mask type number". + +Each ACL has a structure *hash_acl_info_t* representing the "hash-based" +parts of information related to that ACL, primarily the array of +*hash_ace_info_t* structures - each of the members of that array +corresponding to one of the rules (ACEs) in the original ACL, +for this they have a pair of *(acl_index, ace_index)* to keep track, +predominantly for the debugging. + +Why do we need a whole separate structure, and are not adding new fields +to the existing rile structure ? First, encapsulation, to minimize +the pollution of the main ACL code with the hash-based lookup artifacts. + +Second, one rule may correspond to more than one "hash-based" ACE. +In fact, most of the rules do correspond to two of those. Why ? + +Consider that the current ACL lookup logic is that if a packet +is not the initial fragment, and there is an L4 entry acting on the packet, +the comparison will be made only on the L4 protocol field value rather +than on the protocol and port values. This beaviour is governed by +*l4_match_nonfirst_fragment* flag in the *acl_main*, and was needed to +maintain the compatibility with the existing software switch implementation. + +While for the sequential check in *single_acl_match_5tuple()* +it is very easy to implement by just breaking out at the right moment, +in case of hash-based matching this cost us two checks: +one on full 5-tuple and the flag *pkt.is_nonfirst_fragment* being zero, +the second on 3-tuple and the flag *pkt.is_nonfirst_fragment* being one, +with the second check triggered by the *acl_main.l4_match_nonfirst_fragment* +setting being the default 1. This dictates the necessity of having a "match" +field in a given *hash_ace_info_t* element, which would reflect the value +we are supposed to match after applying the mask. + +There can be other circumstances when it might be beneficial to expand +the given rule in the original ACL into multiple - for example, as an +optimization within the port range handling for small port ranges +(this is not done as of the time of writing). + +Assigning ACLs to an interface +------------------------------ + +Once the ACL list is assigned to an interface, or, rather, a new ACL +is added to the list of the existing ACLs applied to the interface, +we need to update the bihash accelerating the lookup. + +All the entries for the lookups are stored within a single *48_8* bihash, +which captures the 5-tuple from the packet as well as the miscellaneous +per-packet information flags, e.g. *l4_valid*, *is_non_first_fragment*, +and so on. To facilitate the use of the single bihash by all the interfaces, +the *is_ip6*, *is_input*, *sw_if_index* are part of the key, +as well as *mask_type_index* - the latter being necessary because +there can be entries with the same value but different masks, e.g.: +`permit ::/0, permit::/128`. + +At the moment of an ACL being applied to an interface, we need to +walk the list of *hash_ace_info_t* entries corresponding to that ACL, +and update the bihash with the keys corresponding to the match +values in these entries. + +The value of the hash match contains the index into a per-*sw_if_index* vector +of *applied_ace_hash_entry_t* elements, as well as a couple of flags: +*shadowed* (optimization: if this flag on a matched entry is zero, means +we can stop the lookup early and declare a match - see below), +and *need_portrange_check* - meaning that what matched was a superset +of the actual match, and we need to perform an extra check. + +Also, upon insertion, we must keep in mind there can be +multiple *applied_ace_hash_entry_t* for the same key and must keep +a list of those. This is necessary to incrementally apply/unapply +the ACLs as part of the ACL vector: say, two ACLs have +"permit 2001:db8::1/128 any" - we should be able to retain the entry +for the second ACL even if we have deleted the first one. +Also, in case there are two entries with the same key but +different port ranges, say 0..42 and 142..65535 - we need +to be able to sequentially match on those if we decide not +to expand them into individual port-specific entries. + +Per-packet lookup +----------------- + +The simple single-packet lookup is defined in +*multi_acl_match_get_applied_ace_index*, which returns the index +of the applied hash ACE if there was a match, or ~0 if there wasn't. + +The future optimized per-packet lookup may be batched in three phases: + +1. Prepare the keys in the per-worker vector by doing logical AND of + original 5-tuple record with the elements of the mask vector. +2. Lookup the keys in the bihash in a batch manner, collecting the + result with lowest u64 (acl index within vector, ACE index) from + the hash lookup value, and performing the list walk if necessary + (for portranges) +3. Take the action from the ACL record as defined by (ACL#, ACE#) from the + resulting lookup winner, or, if no match found, then perform default deny. + +Shadowed/independent/redundant ACEs +------------------------------------ + +During the phase of combining multiple ACLs into one rulebase, when they +are applied to interface, we also can perform several optimizations. + +If a given ACE is a strict subset of another ACE located up in the linear +search order, we can ignore this ACE completely - because by definition +it will never match. We will call such an ACE *redundant*. Here is an example: + +``` +permit 2001:db8:1::/48 2001:db8:2::/48 (B) +deny 2001:d8b:1:1::/64 2001:db8:2:1::/64 (A) +``` + +A bit more formally, we can define this relationship of an ACE A to ACE B as: + +``` +redundant(aceA, aceB) := (contains(protoB, protoA) && contains(srcB, srcA) + && contains(dstB, dstA) && is_after(A, B)) +``` + +Here as "contains" we define an operation operating on the sets defined by +the protocol, (srcIP, srcPortDefinition) and (dstIP, dstPortDefinition) +respectively, and returning true if all the elements represented by +the second argument are represented by the first argument. The "is_after" +is true if A is located below B in the ruleset. + +If a given ACE does not intersect at all with any other ACE +in front of it, we can mark it as such. + +Then during the sequence of the lookups the successful hit on this ACE means +we do not need to look up other mask combinations - thus potentially +significantly speeding up the match process. Here is an example, +assuming we have the following ACL: + +``` +permit 2001:db8:1::/48 2001:db8:2::/48 (B) +deny 2001:db8:3::/48 2001:db8:2:1::/64 (A) +``` + +In this case if we match the second entry, we do not need to check whether +we have matched the first one - the source addresses are completely +different. We call such an ACE *independent* from another. + +We can define this as + +``` +independent(aceA, aceB) := (!intersect(protoA, protoB) || + !intersect(srcA, srcB) || + !intersect(dstA, dstB)) +``` + +where intersect is defined as operation returning true if there are +elements belonging to the sets of both arguments. + +If the entry A is neither redundant nor independent from B, and is below +B in the ruleset, we call such an entry *shadowed* by B, here is an example: + +``` +deny tcp 2001:db8:1::/48 2001:db8:2::/48 (B) +permit 2001:d8b:1:1::/64 2001:db8:2:1::/64 (A) +``` + +This means the earlier rule "carves out" a subset of A, thus leaving +a "shadow". (Evidently, the action needs to be different for the shadow +to have an effect, but for for the terminology sake we do not care). + +The more formal definition: + +``` +shadowed(aceA, aceB) := !redundante(aceA, aceB) && + !independent(aceA, aceB) && + is_after(aceA, aceB) +``` + +Using this terminology, any ruleset can be represented as +a DAG (Directed Acyclic Graph), with the bottom being the implicit +"deny any", pointing to the set of rules shadowing it or the ones +it is redundant for. + +These rules may in turn be shadowing each other. There is no cycles in +this graph because of the natural order of the rules - the rule located +closer to the end of the ruleset can never shadow or make redundant a rule +higher up. + +The optimization that enables can allow for is to skip matching certain +masks on a per-lookup basis - if a given rule has matched, +the only adjustments that can happen is the match with one of +the shadowing rules. + +Also, another avenue for the optimization can be starting the lookup process +with the mask type that maximizes the chances of the independent ACE match, +thus resulting in an ACE lookup being a single hash table hit. + + +Plumbing +-------- + +All the new routines are located in a separate file, +so we can cleanly experiment with a different approach if this +does not fit all of the use cases. + +The constant-time lookup within the data path has the API with +the same signature as: + +``` +u8 +multi_acl_match_5tuple (u32 sw_if_index, fa_5tuple_t * pkt_5tuple, int is_l2, + int is_ip6, int is_input, u32 * acl_match_p, + u32 * rule_match_p, u32 * trace_bitmap) +``` + +There should be a new upper-level function with the same signature, which +will make a decision whether to use a linear lookup, or to use the +constant-time lookup implemented by this work, or to add some other +optimizations (e.g. by keeping the cache of the last N lookups). + +The calls to the routine doing preparatory work should happen +in `acl_add_list()` after creating the linear-lookup structures, +and the routine doing the preparatory work populating the hashtable +should be called from `acl_interface_add_del_inout_acl()` or its callees. + +The initial implementation will be geared towards looking up a single +match at a time, with the subsequent optimizations possible to make +the lookup for more than one packet. + diff --git a/src/plugins/acl/hash_lookup_private.h b/src/plugins/acl/hash_lookup_private.h new file mode 100644 index 00000000000..7b6449cd6ad --- /dev/null +++ b/src/plugins/acl/hash_lookup_private.h @@ -0,0 +1,27 @@ +/* + *------------------------------------------------------------------ + * Copyright (c) 2017 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 ACL_HASH_LOOKUP_DEBUG 0 + +#if ACL_HASH_LOOKUP_DEBUG == 1 +#define DBG(...) clib_warning(__VA_ARGS__) +#define DBG_UNIX_LOG(...) clib_unix_warning(__VA_ARGS__) +#else +#define DBG(...) +#define DBG_UNIX_LOG(...) +#endif + diff --git a/src/plugins/acl/hash_lookup_types.h b/src/plugins/acl/hash_lookup_types.h new file mode 100644 index 00000000000..1c04459155c --- /dev/null +++ b/src/plugins/acl/hash_lookup_types.h @@ -0,0 +1,94 @@ +/* + *------------------------------------------------------------------ + * Copyright (c) 2017 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 _ACL_HASH_LOOKUP_TYPES_H_ +#define _ACL_HASH_LOOKUP_TYPES_H_ + +/* The structure representing the single entry with hash representation */ +typedef struct { + /* these two entries refer to the original ACL# and rule# within that ACL */ + u32 acl_index; + u32 ace_index; + + u32 mask_type_index; + u8 src_portrange_not_powerof2; + u8 dst_portrange_not_powerof2; + + fa_5tuple_t match; + u8 action; +} hash_ace_info_t; + +/* + * The structure holding the information necessary for the hash-based ACL operation + */ +typedef struct { + /* The mask types present in this ACL */ + uword *mask_type_index_bitmap; + hash_ace_info_t *rules; +} hash_acl_info_t; + +typedef struct { + /* original non-compiled ACL */ + u32 acl_index; + u32 ace_index; + /* the index of the hash_ace_info_t */ + u32 hash_ace_info_index; + /* + * in case of the same key having multiple entries, + * this holds the index of the next entry. + */ + u32 next_applied_entry_index; + /* + * previous entry in the list of the chained ones, + * if ~0 then this is entry in the hash. + */ + u32 prev_applied_entry_index; + /* + * Action of this applied ACE + */ + u8 action; +} applied_hash_ace_entry_t; + +typedef struct { + /* + * A logical OR of all the applied_ace_hash_entry_t=> + * hash_ace_info_t=>mask_type_index bits set + */ + uword *mask_type_index_bitmap; +} applied_hash_acl_info_t; + + +typedef union { + u64 as_u64; + struct { + u32 applied_entry_index; + u16 reserved_u16; + u8 reserved_u8; + /* means there is some other entry in front intersecting with this one */ + u8 shadowed:1; + u8 need_portrange_check:1; + u8 reserved_flags:6; + }; +} hash_acl_lookup_value_t; + +#define CT_ASSERT_EQUAL(name, x,y) typedef int assert_ ## name ## _compile_time_assertion_failed[((x) == (y))-1] + +CT_ASSERT_EQUAL(hash_acl_lookup_value_t_is_u64, sizeof(hash_acl_lookup_value_t), sizeof(u64)); + +#undef CT_ASSERT_EQUAL + +#endif |