| /* |
| * 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. |
| */ |
| |
| /** |
| * @file |
| * @brief IPv6 Full Reassembly. |
| * |
| * This file contains the source code for IPv6 full reassembly. |
| */ |
| |
| #include <vppinfra/vec.h> |
| #include <vnet/vnet.h> |
| #include <vnet/ip/ip.h> |
| #include <vppinfra/bihash_48_8.h> |
| #include <vnet/ip/reass/ip6_full_reass.h> |
| |
| #define MSEC_PER_SEC 1000 |
| #define IP6_FULL_REASS_TIMEOUT_DEFAULT_MS 100 |
| #define IP6_FULL_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000 // 10 seconds default |
| #define IP6_FULL_REASS_MAX_REASSEMBLIES_DEFAULT 1024 |
| #define IP6_FULL_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3 |
| #define IP6_FULL_REASS_HT_LOAD_FACTOR (0.75) |
| |
| typedef enum |
| { |
| IP6_FULL_REASS_RC_OK, |
| IP6_FULL_REASS_RC_INTERNAL_ERROR, |
| IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS, |
| IP6_FULL_REASS_RC_NO_BUF, |
| IP6_FULL_REASS_RC_HANDOFF, |
| } ip6_full_reass_rc_t; |
| |
| typedef struct |
| { |
| union |
| { |
| struct |
| { |
| ip6_address_t src; |
| ip6_address_t dst; |
| u32 xx_id; |
| u32 frag_id; |
| u8 unused[7]; |
| u8 proto; |
| }; |
| u64 as_u64[6]; |
| }; |
| } ip6_full_reass_key_t; |
| |
| typedef union |
| { |
| struct |
| { |
| u32 reass_index; |
| u32 memory_owner_thread_index; |
| }; |
| u64 as_u64; |
| } ip6_full_reass_val_t; |
| |
| typedef union |
| { |
| struct |
| { |
| ip6_full_reass_key_t k; |
| ip6_full_reass_val_t v; |
| }; |
| clib_bihash_kv_48_8_t kv; |
| } ip6_full_reass_kv_t; |
| |
| |
| always_inline u32 |
| ip6_full_reass_buffer_get_data_offset (vlib_buffer_t * b) |
| { |
| vnet_buffer_opaque_t *vnb = vnet_buffer (b); |
| return vnb->ip.reass.range_first - vnb->ip.reass.fragment_first; |
| } |
| |
| always_inline u16 |
| ip6_full_reass_buffer_get_data_len (vlib_buffer_t * b) |
| { |
| vnet_buffer_opaque_t *vnb = vnet_buffer (b); |
| return clib_min (vnb->ip.reass.range_last, vnb->ip.reass.fragment_last) - |
| (vnb->ip.reass.fragment_first + |
| ip6_full_reass_buffer_get_data_offset (b)) + 1; |
| } |
| |
| typedef struct |
| { |
| // hash table key |
| ip6_full_reass_key_t key; |
| // time when last packet was received |
| f64 last_heard; |
| // internal id of this reassembly |
| u64 id; |
| // buffer index of first buffer in this reassembly context |
| u32 first_bi; |
| // last octet of packet, ~0 until fragment without more_fragments arrives |
| u32 last_packet_octet; |
| // length of data collected so far |
| u32 data_len; |
| // trace operation counter |
| u32 trace_op_counter; |
| // next index - used by custom apps (~0 if not set) |
| u32 next_index; |
| // error next index - used by custom apps (~0 if not set) |
| u32 error_next_index; |
| // minimum fragment length for this reassembly - used to estimate MTU |
| u16 min_fragment_length; |
| // number of fragments for this reassembly |
| u32 fragments_n; |
| // thread owning memory for this context (whose pool contains this ctx) |
| u32 memory_owner_thread_index; |
| // thread which received fragment with offset 0 and which sends out the |
| // completed reassembly |
| u32 sendout_thread_index; |
| } ip6_full_reass_t; |
| |
| typedef struct |
| { |
| ip6_full_reass_t *pool; |
| u32 reass_n; |
| u32 id_counter; |
| clib_spinlock_t lock; |
| } ip6_full_reass_per_thread_t; |
| |
| typedef struct |
| { |
| // IPv6 config |
| u32 timeout_ms; |
| f64 timeout; |
| u32 expire_walk_interval_ms; |
| // maximum number of fragments in one reassembly |
| u32 max_reass_len; |
| // maximum number of reassemblies |
| u32 max_reass_n; |
| |
| // IPv6 runtime |
| clib_bihash_48_8_t hash; |
| |
| // per-thread data |
| ip6_full_reass_per_thread_t *per_thread_data; |
| |
| // convenience |
| vlib_main_t *vlib_main; |
| |
| // node index of ip6-drop node |
| u32 ip6_drop_idx; |
| u32 ip6_icmp_error_idx; |
| u32 ip6_full_reass_expire_node_idx; |
| |
| /** Worker handoff */ |
| u32 fq_index; |
| u32 fq_feature_index; |
| |
| } ip6_full_reass_main_t; |
| |
| extern ip6_full_reass_main_t ip6_full_reass_main; |
| |
| #ifndef CLIB_MARCH_VARIANT |
| ip6_full_reass_main_t ip6_full_reass_main; |
| #endif /* CLIB_MARCH_VARIANT */ |
| |
| typedef enum |
| { |
| IP6_FULL_REASSEMBLY_NEXT_INPUT, |
| IP6_FULL_REASSEMBLY_NEXT_DROP, |
| IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR, |
| IP6_FULL_REASSEMBLY_NEXT_HANDOFF, |
| IP6_FULL_REASSEMBLY_N_NEXT, |
| } ip6_full_reass_next_t; |
| |
| typedef enum |
| { |
| RANGE_NEW, |
| RANGE_OVERLAP, |
| ICMP_ERROR_RT_EXCEEDED, |
| ICMP_ERROR_FL_TOO_BIG, |
| ICMP_ERROR_FL_NOT_MULT_8, |
| FINALIZE, |
| HANDOFF, |
| } ip6_full_reass_trace_operation_e; |
| |
| typedef struct |
| { |
| u16 range_first; |
| u16 range_last; |
| u32 range_bi; |
| i32 data_offset; |
| u32 data_len; |
| u32 first_bi; |
| } ip6_full_reass_range_trace_t; |
| |
| typedef struct |
| { |
| ip6_full_reass_trace_operation_e action; |
| u32 reass_id; |
| ip6_full_reass_range_trace_t trace_range; |
| u32 op_id; |
| u32 fragment_first; |
| u32 fragment_last; |
| u32 total_data_len; |
| u32 thread_id; |
| u32 thread_id_to; |
| } ip6_full_reass_trace_t; |
| |
| static void |
| ip6_full_reass_trace_details (vlib_main_t * vm, u32 bi, |
| ip6_full_reass_range_trace_t * trace) |
| { |
| vlib_buffer_t *b = vlib_get_buffer (vm, bi); |
| vnet_buffer_opaque_t *vnb = vnet_buffer (b); |
| trace->range_first = vnb->ip.reass.range_first; |
| trace->range_last = vnb->ip.reass.range_last; |
| trace->data_offset = ip6_full_reass_buffer_get_data_offset (b); |
| trace->data_len = ip6_full_reass_buffer_get_data_len (b); |
| trace->range_bi = bi; |
| } |
| |
| static u8 * |
| format_ip6_full_reass_range_trace (u8 * s, va_list * args) |
| { |
| ip6_full_reass_range_trace_t *trace = |
| va_arg (*args, ip6_full_reass_range_trace_t *); |
| s = |
| format (s, "range: [%u, %u], off %d, len %u, bi %u", trace->range_first, |
| trace->range_last, trace->data_offset, trace->data_len, |
| trace->range_bi); |
| return s; |
| } |
| |
| static u8 * |
| format_ip6_full_reass_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 *); |
| ip6_full_reass_trace_t *t = va_arg (*args, ip6_full_reass_trace_t *); |
| u32 indent = 0; |
| if (~0 != t->reass_id) |
| { |
| s = format (s, "reass id: %u, op id: %u ", t->reass_id, t->op_id); |
| indent = format_get_indent (s); |
| s = format (s, "first bi: %u, data len: %u, ip/fragment[%u, %u]", |
| t->trace_range.first_bi, t->total_data_len, |
| t->fragment_first, t->fragment_last); |
| } |
| switch (t->action) |
| { |
| case RANGE_NEW: |
| s = format (s, "\n%Unew %U", format_white_space, indent, |
| format_ip6_full_reass_range_trace, &t->trace_range); |
| break; |
| case RANGE_OVERLAP: |
| s = format (s, "\n%Uoverlap %U", format_white_space, indent, |
| format_ip6_full_reass_range_trace, &t->trace_range); |
| break; |
| case ICMP_ERROR_FL_TOO_BIG: |
| s = format (s, "\n%Uicmp-error - frag_len > 65535 %U", |
| format_white_space, indent, |
| format_ip6_full_reass_range_trace, &t->trace_range); |
| break; |
| case ICMP_ERROR_FL_NOT_MULT_8: |
| s = format (s, "\n%Uicmp-error - frag_len mod 8 != 0 %U", |
| format_white_space, indent, |
| format_ip6_full_reass_range_trace, &t->trace_range); |
| break; |
| case ICMP_ERROR_RT_EXCEEDED: |
| s = format (s, "\n%Uicmp-error - reassembly time exceeded", |
| format_white_space, indent); |
| break; |
| case FINALIZE: |
| s = format (s, "\n%Ufinalize reassembly", format_white_space, indent); |
| break; |
| case HANDOFF: |
| s = |
| format (s, "handoff from thread #%u to thread #%u", t->thread_id, |
| t->thread_id_to); |
| break; |
| } |
| return s; |
| } |
| |
| static void |
| ip6_full_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node, |
| ip6_full_reass_main_t * rm, |
| ip6_full_reass_t * reass, u32 bi, |
| ip6_full_reass_trace_operation_e action, |
| u32 thread_id_to) |
| { |
| vlib_buffer_t *b = vlib_get_buffer (vm, bi); |
| vnet_buffer_opaque_t *vnb = vnet_buffer (b); |
| ip6_full_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0])); |
| if (reass) |
| { |
| t->reass_id = reass->id; |
| t->op_id = reass->trace_op_counter; |
| t->trace_range.first_bi = reass->first_bi; |
| t->total_data_len = reass->data_len; |
| ++reass->trace_op_counter; |
| } |
| else |
| { |
| t->reass_id = ~0; |
| } |
| t->action = action; |
| t->thread_id = vm->thread_index; |
| t->thread_id_to = thread_id_to; |
| ip6_full_reass_trace_details (vm, bi, &t->trace_range); |
| t->fragment_first = vnb->ip.reass.fragment_first; |
| t->fragment_last = vnb->ip.reass.fragment_last; |
| #if 0 |
| static u8 *s = NULL; |
| s = format (s, "%U", format_ip6_full_reass_trace, NULL, NULL, t); |
| printf ("%.*s\n", vec_len (s), s); |
| fflush (stdout); |
| vec_reset_length (s); |
| #endif |
| } |
| |
| always_inline void |
| ip6_full_reass_free_ctx (ip6_full_reass_per_thread_t * rt, |
| ip6_full_reass_t * reass) |
| { |
| pool_put (rt->pool, reass); |
| --rt->reass_n; |
| } |
| |
| always_inline void |
| ip6_full_reass_free (ip6_full_reass_main_t * rm, |
| ip6_full_reass_per_thread_t * rt, |
| ip6_full_reass_t * reass) |
| { |
| clib_bihash_kv_48_8_t kv; |
| kv.key[0] = reass->key.as_u64[0]; |
| kv.key[1] = reass->key.as_u64[1]; |
| kv.key[2] = reass->key.as_u64[2]; |
| kv.key[3] = reass->key.as_u64[3]; |
| kv.key[4] = reass->key.as_u64[4]; |
| kv.key[5] = reass->key.as_u64[5]; |
| clib_bihash_add_del_48_8 (&rm->hash, &kv, 0); |
| ip6_full_reass_free_ctx (rt, reass); |
| } |
| |
| always_inline void |
| ip6_full_reass_drop_all (vlib_main_t * vm, vlib_node_runtime_t * node, |
| ip6_full_reass_main_t * rm, ip6_full_reass_t * reass) |
| { |
| u32 range_bi = reass->first_bi; |
| vlib_buffer_t *range_b; |
| vnet_buffer_opaque_t *range_vnb; |
| u32 *to_free = NULL; |
| while (~0 != range_bi) |
| { |
| range_b = vlib_get_buffer (vm, range_bi); |
| range_vnb = vnet_buffer (range_b); |
| u32 bi = range_bi; |
| while (~0 != bi) |
| { |
| vec_add1 (to_free, bi); |
| vlib_buffer_t *b = vlib_get_buffer (vm, bi); |
| if (b->flags & VLIB_BUFFER_NEXT_PRESENT) |
| { |
| bi = b->next_buffer; |
| b->flags &= ~VLIB_BUFFER_NEXT_PRESENT; |
| } |
| else |
| { |
| bi = ~0; |
| } |
| } |
| range_bi = range_vnb->ip.reass.next_range_bi; |
| } |
| /* send to next_error_index */ |
| if (~0 != reass->error_next_index) |
| { |
| u32 n_left_to_next, *to_next, next_index; |
| |
| next_index = reass->error_next_index; |
| u32 bi = ~0; |
| |
| while (vec_len (to_free) > 0) |
| { |
| vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); |
| |
| while (vec_len (to_free) > 0 && n_left_to_next > 0) |
| { |
| bi = vec_pop (to_free); |
| |
| if (~0 != bi) |
| { |
| to_next[0] = bi; |
| to_next += 1; |
| n_left_to_next -= 1; |
| } |
| } |
| vlib_put_next_frame (vm, node, next_index, n_left_to_next); |
| } |
| } |
| else |
| { |
| vlib_buffer_free (vm, to_free, vec_len (to_free)); |
| } |
| vec_free (to_free); |
| } |
| |
| always_inline void |
| ip6_full_reass_on_timeout (vlib_main_t * vm, vlib_node_runtime_t * node, |
| ip6_full_reass_main_t * rm, |
| ip6_full_reass_t * reass, u32 * icmp_bi) |
| { |
| if (~0 == reass->first_bi) |
| { |
| return; |
| } |
| if (~0 == reass->next_index) // custom apps don't want icmp |
| { |
| vlib_buffer_t *b = vlib_get_buffer (vm, reass->first_bi); |
| if (0 == vnet_buffer (b)->ip.reass.fragment_first) |
| { |
| *icmp_bi = reass->first_bi; |
| if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED)) |
| { |
| ip6_full_reass_add_trace (vm, node, rm, reass, reass->first_bi, |
| ICMP_ERROR_RT_EXCEEDED, ~0); |
| } |
| // fragment with offset zero received - send icmp message back |
| if (b->flags & VLIB_BUFFER_NEXT_PRESENT) |
| { |
| // separate first buffer from chain and steer it towards icmp node |
| b->flags &= ~VLIB_BUFFER_NEXT_PRESENT; |
| reass->first_bi = b->next_buffer; |
| } |
| else |
| { |
| reass->first_bi = vnet_buffer (b)->ip.reass.next_range_bi; |
| } |
| icmp6_error_set_vnet_buffer (b, ICMP6_time_exceeded, |
| ICMP6_time_exceeded_fragment_reassembly_time_exceeded, |
| 0); |
| } |
| } |
| ip6_full_reass_drop_all (vm, node, rm, reass); |
| } |
| |
| always_inline ip6_full_reass_t * |
| ip6_full_reass_find_or_create (vlib_main_t * vm, vlib_node_runtime_t * node, |
| ip6_full_reass_main_t * rm, |
| ip6_full_reass_per_thread_t * rt, |
| ip6_full_reass_kv_t * kv, u32 * icmp_bi, |
| u8 * do_handoff) |
| { |
| ip6_full_reass_t *reass; |
| f64 now; |
| |
| again: |
| |
| reass = NULL; |
| now = vlib_time_now (vm); |
| |
| if (!clib_bihash_search_48_8 |
| (&rm->hash, (clib_bihash_kv_48_8_t *) kv, (clib_bihash_kv_48_8_t *) kv)) |
| { |
| reass = |
| pool_elt_at_index (rm->per_thread_data |
| [kv->v.memory_owner_thread_index].pool, |
| kv->v.reass_index); |
| if (vm->thread_index != kv->v.memory_owner_thread_index) |
| { |
| *do_handoff = 1; |
| return reass; |
| } |
| |
| if (now > reass->last_heard + rm->timeout) |
| { |
| ip6_full_reass_on_timeout (vm, node, rm, reass, icmp_bi); |
| ip6_full_reass_free (rm, rt, reass); |
| reass = NULL; |
| } |
| } |
| |
| if (reass) |
| { |
| reass->last_heard = now; |
| return reass; |
| } |
| |
| if (rt->reass_n >= rm->max_reass_n) |
| { |
| reass = NULL; |
| return reass; |
| } |
| else |
| { |
| pool_get (rt->pool, reass); |
| clib_memset (reass, 0, sizeof (*reass)); |
| reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter; |
| ++rt->id_counter; |
| reass->first_bi = ~0; |
| reass->last_packet_octet = ~0; |
| reass->data_len = 0; |
| reass->next_index = ~0; |
| reass->error_next_index = ~0; |
| ++rt->reass_n; |
| } |
| |
| reass->key.as_u64[0] = ((clib_bihash_kv_48_8_t *) kv)->key[0]; |
| reass->key.as_u64[1] = ((clib_bihash_kv_48_8_t *) kv)->key[1]; |
| reass->key.as_u64[2] = ((clib_bihash_kv_48_8_t *) kv)->key[2]; |
| reass->key.as_u64[3] = ((clib_bihash_kv_48_8_t *) kv)->key[3]; |
| reass->key.as_u64[4] = ((clib_bihash_kv_48_8_t *) kv)->key[4]; |
| reass->key.as_u64[5] = ((clib_bihash_kv_48_8_t *) kv)->key[5]; |
| kv->v.reass_index = (reass - rt->pool); |
| kv->v.memory_owner_thread_index = vm->thread_index; |
| reass->last_heard = now; |
| |
| int rv = |
| clib_bihash_add_del_48_8 (&rm->hash, (clib_bihash_kv_48_8_t *) kv, 2); |
| if (rv) |
| { |
| ip6_full_reass_free (rm, rt, reass); |
| reass = NULL; |
| // if other worker created a context already work with the other copy |
| if (-2 == rv) |
| goto again; |
| } |
| |
| return reass; |
| } |
| |
| always_inline ip6_full_reass_rc_t |
| ip6_full_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node, |
| ip6_full_reass_main_t * rm, |
| ip6_full_reass_per_thread_t * rt, |
| ip6_full_reass_t * reass, u32 * bi0, u32 * next0, |
| u32 * error0, bool is_custom_app) |
| { |
| *bi0 = reass->first_bi; |
| *error0 = IP6_ERROR_NONE; |
| ip6_frag_hdr_t *frag_hdr; |
| vlib_buffer_t *last_b = NULL; |
| u32 sub_chain_bi = reass->first_bi; |
| u32 total_length = 0; |
| u32 buf_cnt = 0; |
| u32 dropped_cnt = 0; |
| u32 *vec_drop_compress = NULL; |
| ip6_full_reass_rc_t rv = IP6_FULL_REASS_RC_OK; |
| do |
| { |
| u32 tmp_bi = sub_chain_bi; |
| vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi); |
| vnet_buffer_opaque_t *vnb = vnet_buffer (tmp); |
| if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) && |
| !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first)) |
| { |
| rv = IP6_FULL_REASS_RC_INTERNAL_ERROR; |
| goto free_buffers_and_return; |
| } |
| |
| u32 data_len = ip6_full_reass_buffer_get_data_len (tmp); |
| u32 trim_front = vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset + |
| sizeof (*frag_hdr) + ip6_full_reass_buffer_get_data_offset (tmp); |
| u32 trim_end = |
| vlib_buffer_length_in_chain (vm, tmp) - trim_front - data_len; |
| if (tmp_bi == reass->first_bi) |
| { |
| /* first buffer - keep ip6 header */ |
| if (0 != ip6_full_reass_buffer_get_data_offset (tmp)) |
| { |
| rv = IP6_FULL_REASS_RC_INTERNAL_ERROR; |
| goto free_buffers_and_return; |
| } |
| trim_front = 0; |
| trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len - |
| (vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset + |
| sizeof (*frag_hdr)); |
| if (!(vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0)) |
| { |
| rv = IP6_FULL_REASS_RC_INTERNAL_ERROR; |
| goto free_buffers_and_return; |
| } |
| } |
| u32 keep_data = |
| vlib_buffer_length_in_chain (vm, tmp) - trim_front - trim_end; |
| while (1) |
| { |
| ++buf_cnt; |
| if (trim_front) |
| { |
| if (trim_front > tmp->current_length) |
| { |
| /* drop whole buffer */ |
| vec_add1 (vec_drop_compress, tmp_bi); |
| trim_front -= tmp->current_length; |
| if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT)) |
| { |
| rv = IP6_FULL_REASS_RC_INTERNAL_ERROR; |
| goto free_buffers_and_return; |
| } |
| tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT; |
| tmp_bi = tmp->next_buffer; |
| tmp = vlib_get_buffer (vm, tmp_bi); |
| continue; |
| } |
| else |
| { |
| vlib_buffer_advance (tmp, trim_front); |
| trim_front = 0; |
| } |
| } |
| if (keep_data) |
| { |
| if (last_b) |
| { |
| last_b->flags |= VLIB_BUFFER_NEXT_PRESENT; |
| last_b->next_buffer = tmp_bi; |
| } |
| last_b = tmp; |
| if (keep_data <= tmp->current_length) |
| { |
| tmp->current_length = keep_data; |
| keep_data = 0; |
| } |
| else |
| { |
| keep_data -= tmp->current_length; |
| if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT)) |
| { |
| rv = IP6_FULL_REASS_RC_INTERNAL_ERROR; |
| goto free_buffers_and_return; |
| } |
| } |
| total_length += tmp->current_length; |
| } |
| else |
| { |
| vec_add1 (vec_drop_compress, tmp_bi); |
| if (reass->first_bi == tmp_bi) |
| { |
| rv = IP6_FULL_REASS_RC_INTERNAL_ERROR; |
| goto free_buffers_and_return; |
| } |
| ++dropped_cnt; |
| } |
| if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT) |
| { |
| tmp_bi = tmp->next_buffer; |
| tmp = vlib_get_buffer (vm, tmp->next_buffer); |
| } |
| else |
| { |
| break; |
| } |
| } |
| sub_chain_bi = |
| vnet_buffer (vlib_get_buffer (vm, sub_chain_bi))->ip. |
| reass.next_range_bi; |
| } |
| while (~0 != sub_chain_bi); |
| |
| if (!last_b) |
| { |
| rv = IP6_FULL_REASS_RC_INTERNAL_ERROR; |
| goto free_buffers_and_return; |
| } |
| last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT; |
| vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi); |
| if (total_length < first_b->current_length) |
| { |
| rv = IP6_FULL_REASS_RC_INTERNAL_ERROR; |
| goto free_buffers_and_return; |
| } |
| total_length -= first_b->current_length; |
| first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID; |
| first_b->total_length_not_including_first_buffer = total_length; |
| // drop fragment header |
| vnet_buffer_opaque_t *first_b_vnb = vnet_buffer (first_b); |
| ip6_header_t *ip = vlib_buffer_get_current (first_b); |
| u16 ip6_frag_hdr_offset = first_b_vnb->ip.reass.ip6_frag_hdr_offset; |
| ip6_ext_header_t *prev_hdr; |
| frag_hdr = |
| ip6_ext_header_find (vm, first_b, ip, IP_PROTOCOL_IPV6_FRAGMENTATION, |
| &prev_hdr); |
| if (prev_hdr) |
| { |
| prev_hdr->next_hdr = frag_hdr->next_hdr; |
| } |
| else |
| { |
| ip->protocol = frag_hdr->next_hdr; |
| } |
| if (!((u8 *) frag_hdr - (u8 *) ip == ip6_frag_hdr_offset)) |
| { |
| rv = IP6_FULL_REASS_RC_INTERNAL_ERROR; |
| goto free_buffers_and_return; |
| } |
| memmove (frag_hdr, (u8 *) frag_hdr + sizeof (*frag_hdr), |
| first_b->current_length - ip6_frag_hdr_offset - |
| sizeof (ip6_frag_hdr_t)); |
| first_b->current_length -= sizeof (*frag_hdr); |
| ip->payload_length = |
| clib_host_to_net_u16 (total_length + first_b->current_length - |
| sizeof (*ip)); |
| if (!vlib_buffer_chain_linearize (vm, first_b)) |
| { |
| rv = IP6_FULL_REASS_RC_NO_BUF; |
| goto free_buffers_and_return; |
| } |
| first_b->flags &= ~VLIB_BUFFER_EXT_HDR_VALID; |
| if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED)) |
| { |
| ip6_full_reass_add_trace (vm, node, rm, reass, reass->first_bi, |
| FINALIZE, ~0); |
| #if 0 |
| // following code does a hexdump of packet fragments to stdout ... |
| do |
| { |
| u32 bi = reass->first_bi; |
| u8 *s = NULL; |
| while (~0 != bi) |
| { |
| vlib_buffer_t *b = vlib_get_buffer (vm, bi); |
| s = format (s, "%u: %U\n", bi, format_hexdump, |
| vlib_buffer_get_current (b), b->current_length); |
| if (b->flags & VLIB_BUFFER_NEXT_PRESENT) |
| { |
| bi = b->next_buffer; |
| } |
| else |
| { |
| break; |
| } |
| } |
| printf ("%.*s\n", vec_len (s), s); |
| fflush (stdout); |
| vec_free (s); |
| } |
| while (0); |
| #endif |
| } |
| if (!is_custom_app) |
| { |
| *next0 = IP6_FULL_REASSEMBLY_NEXT_INPUT; |
| } |
| else |
| { |
| *next0 = reass->next_index; |
| } |
| vnet_buffer (first_b)->ip.reass.estimated_mtu = reass->min_fragment_length; |
| ip6_full_reass_free (rm, rt, reass); |
| reass = NULL; |
| free_buffers_and_return: |
| vlib_buffer_free (vm, vec_drop_compress, vec_len (vec_drop_compress)); |
| vec_free (vec_drop_compress); |
| return rv; |
| } |
| |
| always_inline void |
| ip6_full_reass_insert_range_in_chain (vlib_main_t * vm, |
| ip6_full_reass_main_t * rm, |
| ip6_full_reass_per_thread_t * rt, |
| ip6_full_reass_t * reass, |
| u32 prev_range_bi, u32 new_next_bi) |
| { |
| |
| vlib_buffer_t *new_next_b = vlib_get_buffer (vm, new_next_bi); |
| vnet_buffer_opaque_t *new_next_vnb = vnet_buffer (new_next_b); |
| if (~0 != prev_range_bi) |
| { |
| vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi); |
| vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b); |
| new_next_vnb->ip.reass.next_range_bi = prev_vnb->ip.reass.next_range_bi; |
| prev_vnb->ip.reass.next_range_bi = new_next_bi; |
| } |
| else |
| { |
| if (~0 != reass->first_bi) |
| { |
| new_next_vnb->ip.reass.next_range_bi = reass->first_bi; |
| } |
| reass->first_bi = new_next_bi; |
| } |
| reass->data_len += ip6_full_reass_buffer_get_data_len (new_next_b); |
| } |
| |
| always_inline ip6_full_reass_rc_t |
| ip6_full_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node, |
| ip6_full_reass_main_t * rm, |
| ip6_full_reass_per_thread_t * rt, |
| ip6_full_reass_t * reass, u32 * bi0, u32 * next0, |
| u32 * error0, ip6_frag_hdr_t * frag_hdr, |
| bool is_custom_app, u32 * handoff_thread_idx) |
| { |
| int consumed = 0; |
| vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0); |
| vnet_buffer_opaque_t *fvnb = vnet_buffer (fb); |
| if (is_custom_app) |
| { |
| reass->next_index = fvnb->ip.reass.next_index; // store next_index before it's overwritten |
| reass->error_next_index = fvnb->ip.reass.error_next_index; // store error_next_index before it is overwritten |
| } |
| |
| fvnb->ip.reass.ip6_frag_hdr_offset = |
| (u8 *) frag_hdr - (u8 *) vlib_buffer_get_current (fb); |
| ip6_header_t *fip = vlib_buffer_get_current (fb); |
| if (fb->current_length < sizeof (*fip) || |
| fvnb->ip.reass.ip6_frag_hdr_offset == 0 || |
| fvnb->ip.reass.ip6_frag_hdr_offset >= fb->current_length) |
| { |
| return IP6_FULL_REASS_RC_INTERNAL_ERROR; |
| } |
| |
| u32 fragment_first = fvnb->ip.reass.fragment_first = |
| ip6_frag_hdr_offset_bytes (frag_hdr); |
| u32 fragment_length = |
| vlib_buffer_length_in_chain (vm, fb) - |
| (fvnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr)); |
| u32 fragment_last = fvnb->ip.reass.fragment_last = |
| fragment_first + fragment_length - 1; |
| int more_fragments = ip6_frag_hdr_more (frag_hdr); |
| u32 candidate_range_bi = reass->first_bi; |
| u32 prev_range_bi = ~0; |
| fvnb->ip.reass.range_first = fragment_first; |
| fvnb->ip.reass.range_last = fragment_last; |
| fvnb->ip.reass.next_range_bi = ~0; |
| if (!more_fragments) |
| { |
| reass->last_packet_octet = fragment_last; |
| } |
| if (~0 == reass->first_bi) |
| { |
| // starting a new reassembly |
| ip6_full_reass_insert_range_in_chain (vm, rm, rt, reass, prev_range_bi, |
| *bi0); |
| reass->min_fragment_length = clib_net_to_host_u16 (fip->payload_length); |
| consumed = 1; |
| reass->fragments_n = 1; |
| goto check_if_done_maybe; |
| } |
| reass->min_fragment_length = |
| clib_min (clib_net_to_host_u16 (fip->payload_length), |
| fvnb->ip.reass.estimated_mtu); |
| while (~0 != candidate_range_bi) |
| { |
| vlib_buffer_t *candidate_b = vlib_get_buffer (vm, candidate_range_bi); |
| vnet_buffer_opaque_t *candidate_vnb = vnet_buffer (candidate_b); |
| if (fragment_first > candidate_vnb->ip.reass.range_last) |
| { |
| // this fragments starts after candidate range |
| prev_range_bi = candidate_range_bi; |
| candidate_range_bi = candidate_vnb->ip.reass.next_range_bi; |
| if (candidate_vnb->ip.reass.range_last < fragment_last && |
| ~0 == candidate_range_bi) |
| { |
| // special case - this fragment falls beyond all known ranges |
| ip6_full_reass_insert_range_in_chain (vm, rm, rt, reass, |
| prev_range_bi, *bi0); |
| consumed = 1; |
| break; |
| } |
| continue; |
| } |
| if (fragment_last < candidate_vnb->ip.reass.range_first) |
| { |
| // this fragment ends before candidate range without any overlap |
| ip6_full_reass_insert_range_in_chain (vm, rm, rt, reass, |
| prev_range_bi, *bi0); |
| consumed = 1; |
| } |
| else if (fragment_first == candidate_vnb->ip.reass.range_first && |
| fragment_last == candidate_vnb->ip.reass.range_last) |
| { |
| // duplicate fragment - ignore |
| } |
| else |
| { |
| // overlapping fragment - not allowed by RFC 8200 |
| if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED)) |
| { |
| ip6_full_reass_add_trace (vm, node, rm, reass, *bi0, |
| RANGE_OVERLAP, ~0); |
| } |
| ip6_full_reass_drop_all (vm, node, rm, reass); |
| ip6_full_reass_free (rm, rt, reass); |
| *next0 = IP6_FULL_REASSEMBLY_NEXT_DROP; |
| *error0 = IP6_ERROR_REASS_OVERLAPPING_FRAGMENT; |
| return IP6_FULL_REASS_RC_OK; |
| } |
| break; |
| } |
| ++reass->fragments_n; |
| check_if_done_maybe: |
| if (consumed) |
| { |
| if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED)) |
| { |
| ip6_full_reass_add_trace (vm, node, rm, reass, *bi0, RANGE_NEW, ~0); |
| } |
| } |
| if (~0 != reass->last_packet_octet && |
| reass->data_len == reass->last_packet_octet + 1) |
| { |
| *handoff_thread_idx = reass->sendout_thread_index; |
| int handoff = |
| reass->memory_owner_thread_index != reass->sendout_thread_index; |
| ip6_full_reass_rc_t rc = |
| ip6_full_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0, |
| is_custom_app); |
| if (IP6_FULL_REASS_RC_OK == rc && handoff) |
| { |
| return IP6_FULL_REASS_RC_HANDOFF; |
| } |
| return rc; |
| } |
| else |
| { |
| if (consumed) |
| { |
| *bi0 = ~0; |
| if (reass->fragments_n > rm->max_reass_len) |
| { |
| return IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS; |
| } |
| } |
| else |
| { |
| *next0 = IP6_FULL_REASSEMBLY_NEXT_DROP; |
| *error0 = IP6_ERROR_REASS_DUPLICATE_FRAGMENT; |
| } |
| } |
| return IP6_FULL_REASS_RC_OK; |
| } |
| |
| always_inline bool |
| ip6_full_reass_verify_upper_layer_present (vlib_node_runtime_t * node, |
| vlib_buffer_t * b, |
| ip6_frag_hdr_t * frag_hdr) |
| { |
| ip6_ext_header_t *tmp = (ip6_ext_header_t *) frag_hdr; |
| while (ip6_ext_hdr (tmp->next_hdr)) |
| { |
| tmp = ip6_ext_next_header (tmp); |
| } |
| if (IP_PROTOCOL_IP6_NONXT == tmp->next_hdr) |
| { |
| icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem, |
| ICMP6_parameter_problem_first_fragment_has_incomplete_header_chain, |
| 0); |
| b->error = node->errors[IP6_ERROR_REASS_MISSING_UPPER]; |
| |
| return false; |
| } |
| return true; |
| } |
| |
| always_inline bool |
| ip6_full_reass_verify_fragment_multiple_8 (vlib_main_t * vm, |
| vlib_node_runtime_t * node, |
| vlib_buffer_t * b, |
| ip6_frag_hdr_t * frag_hdr) |
| { |
| vnet_buffer_opaque_t *vnb = vnet_buffer (b); |
| ip6_header_t *ip = vlib_buffer_get_current (b); |
| int more_fragments = ip6_frag_hdr_more (frag_hdr); |
| u32 fragment_length = |
| vlib_buffer_length_in_chain (vm, b) - |
| (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr)); |
| if (more_fragments && 0 != fragment_length % 8) |
| { |
| icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem, |
| ICMP6_parameter_problem_erroneous_header_field, |
| (u8 *) & ip->payload_length - (u8 *) ip); |
| return false; |
| } |
| return true; |
| } |
| |
| always_inline bool |
| ip6_full_reass_verify_packet_size_lt_64k (vlib_main_t * vm, |
| vlib_node_runtime_t * node, |
| vlib_buffer_t * b, |
| ip6_frag_hdr_t * frag_hdr) |
| { |
| vnet_buffer_opaque_t *vnb = vnet_buffer (b); |
| u32 fragment_first = ip6_frag_hdr_offset_bytes (frag_hdr); |
| u32 fragment_length = |
| vlib_buffer_length_in_chain (vm, b) - |
| (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr)); |
| if (fragment_first + fragment_length > 65535) |
| { |
| ip6_header_t *ip0 = vlib_buffer_get_current (b); |
| icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem, |
| ICMP6_parameter_problem_erroneous_header_field, |
| (u8 *) & frag_hdr->fragment_offset_and_more |
| - (u8 *) ip0); |
| return false; |
| } |
| return true; |
| } |
| |
| always_inline uword |
| ip6_full_reassembly_inline (vlib_main_t * vm, |
| vlib_node_runtime_t * node, |
| vlib_frame_t * frame, bool is_feature, |
| bool is_custom_app) |
| { |
| u32 *from = vlib_frame_vector_args (frame); |
| u32 n_left_from, n_left_to_next, *to_next, next_index; |
| ip6_full_reass_main_t *rm = &ip6_full_reass_main; |
| ip6_full_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index]; |
| clib_spinlock_lock (&rt->lock); |
| |
| n_left_from = frame->n_vectors; |
| next_index = node->cached_next_index; |
| while (n_left_from > 0) |
| { |
| vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); |
| |
| while (n_left_from > 0 && n_left_to_next > 0) |
| { |
| u32 bi0; |
| vlib_buffer_t *b0; |
| u32 next0 = IP6_FULL_REASSEMBLY_NEXT_DROP; |
| u32 error0 = IP6_ERROR_NONE; |
| u32 icmp_bi = ~0; |
| |
| bi0 = from[0]; |
| b0 = vlib_get_buffer (vm, bi0); |
| |
| ip6_header_t *ip0 = vlib_buffer_get_current (b0); |
| ip6_frag_hdr_t *frag_hdr = NULL; |
| ip6_ext_header_t *prev_hdr; |
| if (ip6_ext_hdr (ip0->protocol)) |
| { |
| frag_hdr = |
| ip6_ext_header_find (vm, b0, ip0, |
| IP_PROTOCOL_IPV6_FRAGMENTATION, |
| &prev_hdr); |
| } |
| if (!frag_hdr) |
| { |
| // this is a regular packet - no fragmentation |
| next0 = IP6_FULL_REASSEMBLY_NEXT_INPUT; |
| goto skip_reass; |
| } |
| if (0 == ip6_frag_hdr_offset (frag_hdr)) |
| { |
| // first fragment - verify upper-layer is present |
| if (!ip6_full_reass_verify_upper_layer_present |
| (node, b0, frag_hdr)) |
| { |
| next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR; |
| goto skip_reass; |
| } |
| } |
| if (!ip6_full_reass_verify_fragment_multiple_8 |
| (vm, node, b0, frag_hdr) |
| || !ip6_full_reass_verify_packet_size_lt_64k (vm, node, b0, |
| frag_hdr)) |
| { |
| next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR; |
| goto skip_reass; |
| } |
| vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset = |
| (u8 *) frag_hdr - (u8 *) ip0; |
| |
| ip6_full_reass_kv_t kv; |
| u8 do_handoff = 0; |
| |
| kv.k.as_u64[0] = ip0->src_address.as_u64[0]; |
| kv.k.as_u64[1] = ip0->src_address.as_u64[1]; |
| kv.k.as_u64[2] = ip0->dst_address.as_u64[0]; |
| kv.k.as_u64[3] = ip0->dst_address.as_u64[1]; |
| kv.k.as_u64[4] = |
| ((u64) vec_elt (ip6_main.fib_index_by_sw_if_index, |
| vnet_buffer (b0)->sw_if_index[VLIB_RX])) << 32 | |
| (u64) frag_hdr->identification; |
| kv.k.as_u64[5] = ip0->protocol; |
| |
| ip6_full_reass_t *reass = |
| ip6_full_reass_find_or_create (vm, node, rm, rt, &kv, &icmp_bi, |
| &do_handoff); |
| |
| if (reass) |
| { |
| const u32 fragment_first = ip6_frag_hdr_offset (frag_hdr); |
| if (0 == fragment_first) |
| { |
| reass->sendout_thread_index = vm->thread_index; |
| } |
| } |
| if (PREDICT_FALSE (do_handoff)) |
| { |
| next0 = IP6_FULL_REASSEMBLY_NEXT_HANDOFF; |
| vnet_buffer (b0)->ip.reass.owner_thread_index = |
| kv.v.memory_owner_thread_index; |
| } |
| else if (reass) |
| { |
| u32 handoff_thread_idx; |
| switch (ip6_full_reass_update |
| (vm, node, rm, rt, reass, &bi0, &next0, &error0, |
| frag_hdr, is_custom_app, &handoff_thread_idx)) |
| { |
| case IP6_FULL_REASS_RC_OK: |
| /* nothing to do here */ |
| break; |
| case IP6_FULL_REASS_RC_HANDOFF: |
| next0 = IP6_FULL_REASSEMBLY_NEXT_HANDOFF; |
| b0 = vlib_get_buffer (vm, bi0); |
| vnet_buffer (b0)->ip.reass.owner_thread_index = |
| handoff_thread_idx; |
| break; |
| case IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS: |
| vlib_node_increment_counter (vm, node->node_index, |
| IP6_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG, |
| 1); |
| ip6_full_reass_drop_all (vm, node, rm, reass); |
| ip6_full_reass_free (rm, rt, reass); |
| goto next_packet; |
| break; |
| case IP6_FULL_REASS_RC_NO_BUF: |
| vlib_node_increment_counter (vm, node->node_index, |
| IP6_ERROR_REASS_NO_BUF, 1); |
| ip6_full_reass_drop_all (vm, node, rm, reass); |
| ip6_full_reass_free (rm, rt, reass); |
| goto next_packet; |
| break; |
| case IP6_FULL_REASS_RC_INTERNAL_ERROR: |
| vlib_node_increment_counter (vm, node->node_index, |
| IP6_ERROR_REASS_INTERNAL_ERROR, |
| 1); |
| ip6_full_reass_drop_all (vm, node, rm, reass); |
| ip6_full_reass_free (rm, rt, reass); |
| goto next_packet; |
| break; |
| } |
| } |
| else |
| { |
| if (is_feature) |
| { |
| next0 = IP6_FULL_REASSEMBLY_NEXT_DROP; |
| } |
| else |
| { |
| vnet_buffer_opaque_t *fvnb = vnet_buffer (b0); |
| next0 = fvnb->ip.reass.error_next_index; |
| } |
| error0 = IP6_ERROR_REASS_LIMIT_REACHED; |
| } |
| |
| b0->error = node->errors[error0]; |
| |
| if (~0 != bi0) |
| { |
| skip_reass: |
| to_next[0] = bi0; |
| to_next += 1; |
| n_left_to_next -= 1; |
| if (next0 == IP6_FULL_REASSEMBLY_NEXT_HANDOFF) |
| { |
| if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) |
| { |
| ip6_full_reass_add_trace (vm, node, rm, NULL, bi0, |
| HANDOFF, |
| vnet_buffer (b0)->ip. |
| reass.owner_thread_index); |
| } |
| } |
| else if (is_feature && IP6_ERROR_NONE == error0) |
| { |
| b0 = vlib_get_buffer (vm, bi0); |
| vnet_feature_next (&next0, b0); |
| } |
| vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, |
| n_left_to_next, bi0, next0); |
| } |
| |
| if (~0 != icmp_bi) |
| { |
| next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR; |
| to_next[0] = icmp_bi; |
| to_next += 1; |
| n_left_to_next -= 1; |
| vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, |
| n_left_to_next, icmp_bi, |
| next0); |
| } |
| next_packet: |
| from += 1; |
| n_left_from -= 1; |
| } |
| |
| vlib_put_next_frame (vm, node, next_index, n_left_to_next); |
| } |
| |
| clib_spinlock_unlock (&rt->lock); |
| return frame->n_vectors; |
| } |
| |
| static char *ip6_full_reassembly_error_strings[] = { |
| #define _(sym, string) string, |
| foreach_ip6_error |
| #undef _ |
| }; |
| |
| VLIB_NODE_FN (ip6_full_reass_node) (vlib_main_t * vm, |
| vlib_node_runtime_t * node, |
| vlib_frame_t * frame) |
| { |
| return ip6_full_reassembly_inline (vm, node, frame, false /* is_feature */ , |
| false /* is_custom_app */ ); |
| } |
| |
| /* *INDENT-OFF* */ |
| VLIB_REGISTER_NODE (ip6_full_reass_node) = { |
| .name = "ip6-full-reassembly", |
| .vector_size = sizeof (u32), |
| .format_trace = format_ip6_full_reass_trace, |
| .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings), |
| .error_strings = ip6_full_reassembly_error_strings, |
| .n_next_nodes = IP6_FULL_REASSEMBLY_N_NEXT, |
| .next_nodes = |
| { |
| [IP6_FULL_REASSEMBLY_NEXT_INPUT] = "ip6-input", |
| [IP6_FULL_REASSEMBLY_NEXT_DROP] = "ip6-drop", |
| [IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error", |
| [IP6_FULL_REASSEMBLY_NEXT_HANDOFF] = "ip6-full-reassembly-handoff", |
| }, |
| }; |
| /* *INDENT-ON* */ |
| |
| VLIB_NODE_FN (ip6_full_reass_node_feature) (vlib_main_t * vm, |
| vlib_node_runtime_t * node, |
| vlib_frame_t * frame) |
| { |
| return ip6_full_reassembly_inline (vm, node, frame, true /* is_feature */ , |
| false /* is_custom_app */ ); |
| } |
| |
| /* *INDENT-OFF* */ |
| VLIB_REGISTER_NODE (ip6_full_reass_node_feature) = { |
| .name = "ip6-full-reassembly-feature", |
| .vector_size = sizeof (u32), |
| .format_trace = format_ip6_full_reass_trace, |
| .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings), |
| .error_strings = ip6_full_reassembly_error_strings, |
| .n_next_nodes = IP6_FULL_REASSEMBLY_N_NEXT, |
| .next_nodes = |
| { |
| [IP6_FULL_REASSEMBLY_NEXT_INPUT] = "ip6-input", |
| [IP6_FULL_REASSEMBLY_NEXT_DROP] = "ip6-drop", |
| [IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error", |
| [IP6_FULL_REASSEMBLY_NEXT_HANDOFF] = "ip6-full-reass-feature-hoff", |
| }, |
| }; |
| /* *INDENT-ON* */ |
| |
| /* *INDENT-OFF* */ |
| VNET_FEATURE_INIT (ip6_full_reassembly_feature, static) = { |
| .arc_name = "ip6-unicast", |
| .node_name = "ip6-full-reassembly-feature", |
| .runs_before = VNET_FEATURES ("ip6-lookup", |
| "ipsec6-input-feature"), |
| .runs_after = 0, |
| }; |
| /* *INDENT-ON* */ |
| |
| #ifndef CLIB_MARCH_VARIANT |
| static u32 |
| ip6_full_reass_get_nbuckets () |
| { |
| ip6_full_reass_main_t *rm = &ip6_full_reass_main; |
| u32 nbuckets; |
| u8 i; |
| |
| nbuckets = (u32) (rm->max_reass_n / IP6_FULL_REASS_HT_LOAD_FACTOR); |
| |
| for (i = 0; i < 31; i++) |
| if ((1 << i) >= nbuckets) |
| break; |
| nbuckets = 1 << i; |
| |
| return nbuckets; |
| } |
| #endif /* CLIB_MARCH_VARIANT */ |
| |
| typedef enum |
| { |
| IP6_EVENT_CONFIG_CHANGED = 1, |
| } ip6_full_reass_event_t; |
| |
| #ifndef CLIB_MARCH_VARIANT |
| typedef struct |
| { |
| int failure; |
| clib_bihash_48_8_t *new_hash; |
| } ip6_rehash_cb_ctx; |
| |
| static void |
| ip6_rehash_cb (clib_bihash_kv_48_8_t * kv, void *_ctx) |
| { |
| ip6_rehash_cb_ctx *ctx = _ctx; |
| if (clib_bihash_add_del_48_8 (ctx->new_hash, kv, 1)) |
| { |
| ctx->failure = 1; |
| } |
| } |
| |
| static void |
| ip6_full_reass_set_params (u32 timeout_ms, u32 max_reassemblies, |
| u32 max_reassembly_length, |
| u32 expire_walk_interval_ms) |
| { |
| ip6_full_reass_main.timeout_ms = timeout_ms; |
| ip6_full_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC; |
| ip6_full_reass_main.max_reass_n = max_reassemblies; |
| ip6_full_reass_main.max_reass_len = max_reassembly_length; |
| ip6_full_reass_main.expire_walk_interval_ms = expire_walk_interval_ms; |
| } |
| |
| vnet_api_error_t |
| ip6_full_reass_set (u32 timeout_ms, u32 max_reassemblies, |
| u32 max_reassembly_length, u32 expire_walk_interval_ms) |
| { |
| u32 old_nbuckets = ip6_full_reass_get_nbuckets (); |
| ip6_full_reass_set_params (timeout_ms, max_reassemblies, |
| max_reassembly_length, expire_walk_interval_ms); |
| vlib_process_signal_event (ip6_full_reass_main.vlib_main, |
| ip6_full_reass_main.ip6_full_reass_expire_node_idx, |
| IP6_EVENT_CONFIG_CHANGED, 0); |
| u32 new_nbuckets = ip6_full_reass_get_nbuckets (); |
| if (ip6_full_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets) |
| { |
| clib_bihash_48_8_t new_hash; |
| clib_memset (&new_hash, 0, sizeof (new_hash)); |
| ip6_rehash_cb_ctx ctx; |
| ctx.failure = 0; |
| ctx.new_hash = &new_hash; |
| clib_bihash_init_48_8 (&new_hash, "ip6-full-reass", new_nbuckets, |
| new_nbuckets * 1024); |
| clib_bihash_foreach_key_value_pair_48_8 (&ip6_full_reass_main.hash, |
| ip6_rehash_cb, &ctx); |
| if (ctx.failure) |
| { |
| clib_bihash_free_48_8 (&new_hash); |
| return -1; |
| } |
| else |
| { |
| clib_bihash_free_48_8 (&ip6_full_reass_main.hash); |
| clib_memcpy_fast (&ip6_full_reass_main.hash, &new_hash, |
| sizeof (ip6_full_reass_main.hash)); |
| clib_bihash_copied (&ip6_full_reass_main.hash, &new_hash); |
| } |
| } |
| return 0; |
| } |
| |
| vnet_api_error_t |
| ip6_full_reass_get (u32 * timeout_ms, u32 * max_reassemblies, |
| u32 * max_reassembly_length, |
| u32 * expire_walk_interval_ms) |
| { |
| *timeout_ms = ip6_full_reass_main.timeout_ms; |
| *max_reassemblies = ip6_full_reass_main.max_reass_n; |
| *max_reassembly_length = ip6_full_reass_main.max_reass_len; |
| *expire_walk_interval_ms = ip6_full_reass_main.expire_walk_interval_ms; |
| return 0; |
| } |
| |
| static clib_error_t * |
| ip6_full_reass_init_function (vlib_main_t * vm) |
| { |
| ip6_full_reass_main_t *rm = &ip6_full_reass_main; |
| clib_error_t *error = 0; |
| u32 nbuckets; |
| vlib_node_t *node; |
| |
| rm->vlib_main = vm; |
| |
| vec_validate (rm->per_thread_data, vlib_num_workers ()); |
| ip6_full_reass_per_thread_t *rt; |
| vec_foreach (rt, rm->per_thread_data) |
| { |
| clib_spinlock_init (&rt->lock); |
| pool_alloc (rt->pool, rm->max_reass_n); |
| } |
| |
| node = vlib_get_node_by_name (vm, (u8 *) "ip6-full-reassembly-expire-walk"); |
| ASSERT (node); |
| rm->ip6_full_reass_expire_node_idx = node->index; |
| |
| ip6_full_reass_set_params (IP6_FULL_REASS_TIMEOUT_DEFAULT_MS, |
| IP6_FULL_REASS_MAX_REASSEMBLIES_DEFAULT, |
| IP6_FULL_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT, |
| IP6_FULL_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS); |
| |
| nbuckets = ip6_full_reass_get_nbuckets (); |
| clib_bihash_init_48_8 (&rm->hash, "ip6-full-reass", nbuckets, |
| nbuckets * 1024); |
| |
| node = vlib_get_node_by_name (vm, (u8 *) "ip6-drop"); |
| ASSERT (node); |
| rm->ip6_drop_idx = node->index; |
| node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error"); |
| ASSERT (node); |
| rm->ip6_icmp_error_idx = node->index; |
| |
| if ((error = vlib_call_init_function (vm, ip_main_init))) |
| return error; |
| ip6_register_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION, |
| ip6_full_reass_node.index); |
| |
| rm->fq_index = vlib_frame_queue_main_init (ip6_full_reass_node.index, 0); |
| rm->fq_feature_index = |
| vlib_frame_queue_main_init (ip6_full_reass_node_feature.index, 0); |
| |
| return error; |
| } |
| |
| VLIB_INIT_FUNCTION (ip6_full_reass_init_function); |
| #endif /* CLIB_MARCH_VARIANT */ |
| |
| static uword |
| ip6_full_reass_walk_expired (vlib_main_t * vm, |
| vlib_node_runtime_t * node, vlib_frame_t * f) |
| { |
| ip6_full_reass_main_t *rm = &ip6_full_reass_main; |
| uword event_type, *event_data = 0; |
| |
| while (true) |
| { |
| vlib_process_wait_for_event_or_clock (vm, |
| (f64) rm->expire_walk_interval_ms |
| / (f64) MSEC_PER_SEC); |
| event_type = vlib_process_get_events (vm, &event_data); |
| |
| switch (event_type) |
| { |
| case ~0: /* no events => timeout */ |
| /* nothing to do here */ |
| break; |
| case IP6_EVENT_CONFIG_CHANGED: |
| break; |
| default: |
| clib_warning ("BUG: event type 0x%wx", event_type); |
| break; |
| } |
| f64 now = vlib_time_now (vm); |
| |
| ip6_full_reass_t *reass; |
| int *pool_indexes_to_free = NULL; |
| |
| uword thread_index = 0; |
| int index; |
| const uword nthreads = vlib_num_workers () + 1; |
| u32 *vec_icmp_bi = NULL; |
| for (thread_index = 0; thread_index < nthreads; ++thread_index) |
| { |
| ip6_full_reass_per_thread_t *rt = |
| &rm->per_thread_data[thread_index]; |
| clib_spinlock_lock (&rt->lock); |
| |
| vec_reset_length (pool_indexes_to_free); |
| /* *INDENT-OFF* */ |
| pool_foreach_index (index, rt->pool, ({ |
| reass = pool_elt_at_index (rt->pool, index); |
| if (now > reass->last_heard + rm->timeout) |
| { |
| vec_add1 (pool_indexes_to_free, index); |
| } |
| })); |
| /* *INDENT-ON* */ |
| int *i; |
| /* *INDENT-OFF* */ |
| vec_foreach (i, pool_indexes_to_free) |
| { |
| ip6_full_reass_t *reass = pool_elt_at_index (rt->pool, i[0]); |
| u32 icmp_bi = ~0; |
| ip6_full_reass_on_timeout (vm, node, rm, reass, &icmp_bi); |
| if (~0 != icmp_bi) |
| vec_add1 (vec_icmp_bi, icmp_bi); |
| |
| ip6_full_reass_free (rm, rt, reass); |
| } |
| /* *INDENT-ON* */ |
| |
| clib_spinlock_unlock (&rt->lock); |
| } |
| |
| while (vec_len (vec_icmp_bi) > 0) |
| { |
| vlib_frame_t *f = |
| vlib_get_frame_to_node (vm, rm->ip6_icmp_error_idx); |
| u32 *to_next = vlib_frame_vector_args (f); |
| u32 n_left_to_next = VLIB_FRAME_SIZE - f->n_vectors; |
| int trace_frame = 0; |
| while (vec_len (vec_icmp_bi) > 0 && n_left_to_next > 0) |
| { |
| u32 bi = vec_pop (vec_icmp_bi); |
| vlib_buffer_t *b = vlib_get_buffer (vm, bi); |
| if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED)) |
| trace_frame = 1; |
| b->error = node->errors[IP6_ERROR_REASS_TIMEOUT]; |
| to_next[0] = bi; |
| ++f->n_vectors; |
| to_next += 1; |
| n_left_to_next -= 1; |
| } |
| f->frame_flags |= (trace_frame * VLIB_FRAME_TRACE); |
| vlib_put_frame_to_node (vm, rm->ip6_icmp_error_idx, f); |
| } |
| |
| vec_free (pool_indexes_to_free); |
| vec_free (vec_icmp_bi); |
| if (event_data) |
| { |
| _vec_len (event_data) = 0; |
| } |
| } |
| |
| return 0; |
| } |
| |
| /* *INDENT-OFF* */ |
| VLIB_REGISTER_NODE (ip6_full_reass_expire_node) = { |
| .function = ip6_full_reass_walk_expired, |
| .format_trace = format_ip6_full_reass_trace, |
| .type = VLIB_NODE_TYPE_PROCESS, |
| .name = "ip6-full-reassembly-expire-walk", |
| |
| .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings), |
| .error_strings = ip6_full_reassembly_error_strings, |
| |
| }; |
| /* *INDENT-ON* */ |
| |
| static u8 * |
| format_ip6_full_reass_key (u8 * s, va_list * args) |
| { |
| ip6_full_reass_key_t *key = va_arg (*args, ip6_full_reass_key_t *); |
| s = format (s, "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u", |
| key->xx_id, format_ip6_address, &key->src, format_ip6_address, |
| &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto); |
| return s; |
| } |
| |
| static u8 * |
| format_ip6_full_reass (u8 * s, va_list * args) |
| { |
| vlib_main_t *vm = va_arg (*args, vlib_main_t *); |
| ip6_full_reass_t *reass = va_arg (*args, ip6_full_reass_t *); |
| |
| s = format (s, "ID: %lu, key: %U\n first_bi: %u, data_len: %u, " |
| "last_packet_octet: %u, trace_op_counter: %u\n", |
| reass->id, format_ip6_full_reass_key, &reass->key, |
| reass->first_bi, reass->data_len, reass->last_packet_octet, |
| reass->trace_op_counter); |
| u32 bi = reass->first_bi; |
| u32 counter = 0; |
| while (~0 != bi) |
| { |
| vlib_buffer_t *b = vlib_get_buffer (vm, bi); |
| vnet_buffer_opaque_t *vnb = vnet_buffer (b); |
| s = format (s, " #%03u: range: [%u, %u], bi: %u, off: %d, len: %u, " |
| "fragment[%u, %u]\n", |
| counter, vnb->ip.reass.range_first, |
| vnb->ip.reass.range_last, bi, |
| ip6_full_reass_buffer_get_data_offset (b), |
| ip6_full_reass_buffer_get_data_len (b), |
| vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last); |
| if (b->flags & VLIB_BUFFER_NEXT_PRESENT) |
| { |
| bi = b->next_buffer; |
| } |
| else |
| { |
| bi = ~0; |
| } |
| } |
| return s; |
| } |
| |
| static clib_error_t * |
| show_ip6_full_reass (vlib_main_t * vm, unformat_input_t * input, |
| CLIB_UNUSED (vlib_cli_command_t * lmd)) |
| { |
| ip6_full_reass_main_t *rm = &ip6_full_reass_main; |
| |
| vlib_cli_output (vm, "---------------------"); |
| vlib_cli_output (vm, "IP6 reassembly status"); |
| vlib_cli_output (vm, "---------------------"); |
| bool details = false; |
| if (unformat (input, "details")) |
| { |
| details = true; |
| } |
| |
| u32 sum_reass_n = 0; |
| u64 sum_buffers_n = 0; |
| ip6_full_reass_t *reass; |
| uword thread_index; |
| const uword nthreads = vlib_num_workers () + 1; |
| for (thread_index = 0; thread_index < nthreads; ++thread_index) |
| { |
| ip6_full_reass_per_thread_t *rt = &rm->per_thread_data[thread_index]; |
| clib_spinlock_lock (&rt->lock); |
| if (details) |
| { |
| /* *INDENT-OFF* */ |
| pool_foreach (reass, rt->pool, { |
| vlib_cli_output (vm, "%U", format_ip6_full_reass, vm, reass); |
| }); |
| /* *INDENT-ON* */ |
| } |
| sum_reass_n += rt->reass_n; |
| clib_spinlock_unlock (&rt->lock); |
| } |
| vlib_cli_output (vm, "---------------------"); |
| vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n", |
| (long unsigned) sum_reass_n); |
| vlib_cli_output (vm, "Maximum configured concurrent IP6 reassemblies per " |
| "worker-thread: %lu\n", (long unsigned) rm->max_reass_n); |
| vlib_cli_output (vm, "Buffers in use: %lu\n", |
| (long unsigned) sum_buffers_n); |
| return 0; |
| } |
| |
| /* *INDENT-OFF* */ |
| VLIB_CLI_COMMAND (show_ip6_full_reassembly_cmd, static) = { |
| .path = "show ip6-full-reassembly", |
| .short_help = "show ip6-full-reassembly [details]", |
| .function = show_ip6_full_reass, |
| }; |
| /* *INDENT-ON* */ |
| |
| #ifndef CLIB_MARCH_VARIANT |
| vnet_api_error_t |
| ip6_full_reass_enable_disable (u32 sw_if_index, u8 enable_disable) |
| { |
| return vnet_feature_enable_disable ("ip6-unicast", |
| "ip6-full-reassembly-feature", |
| sw_if_index, enable_disable, 0, 0); |
| } |
| #endif /* CLIB_MARCH_VARIANT */ |
| |
| #define foreach_ip6_full_reassembly_handoff_error \ |
| _(CONGESTION_DROP, "congestion drop") |
| |
| |
| typedef enum |
| { |
| #define _(sym,str) IP6_FULL_REASSEMBLY_HANDOFF_ERROR_##sym, |
| foreach_ip6_full_reassembly_handoff_error |
| #undef _ |
| IP6_FULL_REASSEMBLY_HANDOFF_N_ERROR, |
| } ip6_full_reassembly_handoff_error_t; |
| |
| static char *ip6_full_reassembly_handoff_error_strings[] = { |
| #define _(sym,string) string, |
| foreach_ip6_full_reassembly_handoff_error |
| #undef _ |
| }; |
| |
| typedef struct |
| { |
| u32 next_worker_index; |
| } ip6_full_reassembly_handoff_trace_t; |
| |
| static u8 * |
| format_ip6_full_reassembly_handoff_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 *); |
| ip6_full_reassembly_handoff_trace_t *t = |
| va_arg (*args, ip6_full_reassembly_handoff_trace_t *); |
| |
| s = |
| format (s, "ip6-full-reassembly-handoff: next-worker %d", |
| t->next_worker_index); |
| |
| return s; |
| } |
| |
| always_inline uword |
| ip6_full_reassembly_handoff_inline (vlib_main_t * vm, |
| vlib_node_runtime_t * node, |
| vlib_frame_t * frame, bool is_feature) |
| { |
| ip6_full_reass_main_t *rm = &ip6_full_reass_main; |
| |
| vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b; |
| u32 n_enq, n_left_from, *from; |
| u16 thread_indices[VLIB_FRAME_SIZE], *ti; |
| u32 fq_index; |
| |
| from = vlib_frame_vector_args (frame); |
| n_left_from = frame->n_vectors; |
| vlib_get_buffers (vm, from, bufs, n_left_from); |
| |
| b = bufs; |
| ti = thread_indices; |
| |
| fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index; |
| |
| while (n_left_from > 0) |
| { |
| ti[0] = vnet_buffer (b[0])->ip.reass.owner_thread_index; |
| |
| if (PREDICT_FALSE |
| ((node->flags & VLIB_NODE_FLAG_TRACE) |
| && (b[0]->flags & VLIB_BUFFER_IS_TRACED))) |
| { |
| ip6_full_reassembly_handoff_trace_t *t = |
| vlib_add_trace (vm, node, b[0], sizeof (*t)); |
| t->next_worker_index = ti[0]; |
| } |
| |
| n_left_from -= 1; |
| ti += 1; |
| b += 1; |
| } |
| n_enq = |
| vlib_buffer_enqueue_to_thread (vm, fq_index, from, thread_indices, |
| frame->n_vectors, 1); |
| |
| if (n_enq < frame->n_vectors) |
| vlib_node_increment_counter (vm, node->node_index, |
| IP6_FULL_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP, |
| frame->n_vectors - n_enq); |
| return frame->n_vectors; |
| } |
| |
| VLIB_NODE_FN (ip6_full_reassembly_handoff_node) (vlib_main_t * vm, |
| vlib_node_runtime_t * node, |
| vlib_frame_t * frame) |
| { |
| return ip6_full_reassembly_handoff_inline (vm, node, frame, |
| false /* is_feature */ ); |
| } |
| |
| /* *INDENT-OFF* */ |
| VLIB_REGISTER_NODE (ip6_full_reassembly_handoff_node) = { |
| .name = "ip6-full-reassembly-handoff", |
| .vector_size = sizeof (u32), |
| .n_errors = ARRAY_LEN(ip6_full_reassembly_handoff_error_strings), |
| .error_strings = ip6_full_reassembly_handoff_error_strings, |
| .format_trace = format_ip6_full_reassembly_handoff_trace, |
| |
| .n_next_nodes = 1, |
| |
| .next_nodes = { |
| [0] = "error-drop", |
| }, |
| }; |
| |
| |
| VLIB_NODE_FN (ip6_full_reassembly_feature_handoff_node) (vlib_main_t * vm, |
| vlib_node_runtime_t * node, vlib_frame_t * frame) |
| { |
| return ip6_full_reassembly_handoff_inline (vm, node, frame, true /* is_feature */ ); |
| } |
| |
| |
| /* *INDENT-OFF* */ |
| VLIB_REGISTER_NODE (ip6_full_reassembly_feature_handoff_node) = { |
| .name = "ip6-full-reass-feature-hoff", |
| .vector_size = sizeof (u32), |
| .n_errors = ARRAY_LEN(ip6_full_reassembly_handoff_error_strings), |
| .error_strings = ip6_full_reassembly_handoff_error_strings, |
| .format_trace = format_ip6_full_reassembly_handoff_trace, |
| |
| .n_next_nodes = 1, |
| |
| .next_nodes = { |
| [0] = "error-drop", |
| }, |
| }; |
| /* *INDENT-ON* */ |
| |
| /* |
| * fd.io coding-style-patch-verification: ON |
| * |
| * Local Variables: |
| * eval: (c-set-style "gnu") |
| * End: |
| */ |