Mcast rewrite optimisations - vpp - Vector Packet Processing

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author	Neale Ranns <nranns@cisco.com>	2017-06-01 05:43:19 -0400
committer	Damjan Marion <dmarion.lists@gmail.com>	2018-04-18 16:19:03 +0000
commit	889fe948df5d53c6210b4db402b8c07d3e45d680 (patch)
tree	1ae3609ebd9bae146fe53060f53430cfbab404ac /src/vnet/interface.c
parent	6c354941602df78f4c3bd78aa3b21fe447e3173d (diff)

Mcast rewrite optimisations

hard code the address mask offsets. This are protocol specific and only used on ethernet when used at all. Change-Id: Ib1f6f33682f53254ffbb5a241a1583e65420e0c7 Signed-off-by: Neale Ranns <nranns@cisco.com>

Diffstat (limited to 'src/vnet/interface.c')

-rw-r--r--

src/vnet/interface.c

1 files changed, 1 insertions, 1 deletions

/* * 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> #include <vnet/ip/ip6_inlines.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_INVALID_FRAG_LEN, } 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_local_index; u32 fq_feature_index; // reference count for enabling/disabling feature - per interface u32 *feature_use_refcount_per_intf; // whether local fragmented packets are reassembled or not int is_local_reass_enabled; } 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, PASSTHROUGH, } 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; bool is_after_handoff; ip6_header_t ip6_header; ip6_frag_hdr_t ip6_frag_header; } 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) { if (t->is_after_handoff) { s = format (s, "%U\n", format_ip6_header, &t->ip6_header, sizeof (t->ip6_header)); s = format (s, " %U\n", format_ip6_frag_hdr, &t->ip6_frag_header, sizeof (t->ip6_frag_header)); indent = 2; } s = format (s, "%Ureass id: %u, op id: %u, ", format_white_space, indent, 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; case PASSTHROUGH: s = format (s, "passthrough - not a fragment"); break; } return s; } static void ip6_full_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node, ip6_full_reass_t * reass, u32 bi, ip6_frag_hdr_t * ip6_frag_header, 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); bool is_after_handoff = false; if (pool_is_free_index (vm->trace_main.trace_buffer_pool, vlib_buffer_get_trace_index (b))) { // this buffer's trace is gone b->flags &= ~VLIB_BUFFER_IS_TRACED; return; } if (vlib_buffer_get_trace_thread (b) != vm->thread_index) { is_after_handoff = true; } ip6_full_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0])); t->is_after_handoff = is_after_handoff; if (t->is_after_handoff) { clib_memcpy (&t->ip6_header, vlib_buffer_get_current (b), clib_min (sizeof (t->ip6_header), b->current_length)); if (ip6_frag_header) { clib_memcpy (&t->ip6_frag_header, ip6_frag_header, sizeof (t->ip6_frag_header)); } else { clib_memset (&t->ip6_frag_header, 0, sizeof (t->ip6_frag_header)); } } 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_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_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, reass, reass->first_bi, NULL, 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, 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, int skip_bihash) { ip6_full_reass_t *reass; f64 now; again: reass = NULL; now = vlib_time_now (vm); if (!skip_bihash && !clib_bihash_search_48_8 (&rm->hash, &kv->kv, &kv->kv)) { if (vm->thread_index != kv->v.memory_owner_thread_index) { *do_handoff = 1; return NULL; } reass = pool_elt_at_index (rm->per_thread_data [kv->v.memory_owner_thread_index].pool, kv->v.reass_index); if (now > reass->last_heard + rm->timeout) { ip6_full_reass_on_timeout (vm, node, 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; reass->memory_owner_thread_index = vm->thread_index; ++rt->reass_n; } kv->v.reass_index = (reass - rt->pool); kv->v.memory_owner_thread_index = vm->thread_index; reass->last_heard = now; if (!skip_bihash) { reass->key.as_u64[0] = kv->kv.key[0]; reass->key.as_u64[1] = kv->kv.key[1]; reass->key.as_u64[2] = kv->kv.key[2]; reass->key.as_u64[3] = kv->kv.key[3]; reass->key.as_u64[4] = kv->kv.key[4]; reass->key.as_u64[5] = kv->kv.key[5]; int rv = clib_bihash_add_del_48_8 (&rm->hash, &kv->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; } } else { reass->key.as_u64[0] = ~0; reass->key.as_u64[1] = ~0; reass->key.as_u64[2] = ~0; reass->key.as_u64[3] = ~0; reass->key.as_u64[4] = ~0; reass->key.as_u64[5] = ~0; } 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_hdr_chain_t hdr_chain; ip6_ext_header_t *prev_hdr = 0; int res = ip6_ext_header_walk (first_b, ip, IP_PROTOCOL_IPV6_FRAGMENTATION, &hdr_chain); if (res < 0 || (hdr_chain.eh[res].protocol != IP_PROTOCOL_IPV6_FRAGMENTATION)) { rv = IP6_FULL_REASS_RC_INTERNAL_ERROR; goto free_buffers_and_return; } frag_hdr = ip6_ext_next_header_offset (ip, hdr_chain.eh[res].offset); if (res > 0) { prev_hdr = ip6_ext_next_header_offset (ip, hdr_chain.eh[res - 1].offset); prev_hdr->next_hdr = frag_hdr->next_hdr; } else { ip->protocol = frag_hdr->next_hdr; } if (hdr_chain.eh[res].offset != 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, reass, reass->first_bi, NULL, 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_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 skip_bihash) { 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)); if (0 == fragment_length) { return IP6_FULL_REASS_RC_INVALID_FRAG_LEN; } 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, 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, 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, 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, reass, *bi0, frag_hdr, RANGE_OVERLAP, ~0); } ip6_full_reass_drop_all (vm, node, 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, reass, *bi0, frag_hdr, RANGE_NEW, ~0); } } else if (skip_bihash) { // if this reassembly is not in bihash, then the packet must have been // consumed return IP6_FULL_REASS_RC_INTERNAL_ERROR; } 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 (skip_bihash) { // if this reassembly is not in bihash, it should've been an atomic // fragment and thus finalized return IP6_FULL_REASS_RC_INTERNAL_ERROR; } 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_ext_hdr_chain_t *hc) { int nh = hc->eh[hc->length - 1].protocol; /* Checking to see if it's a terminating header */ if (ip6_ext_hdr (nh)) { 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_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_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, bool is_local) { 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; ip6_ext_hdr_chain_t hdr_chain; int res = ip6_ext_header_walk ( b0, ip0, IP_PROTOCOL_IPV6_FRAGMENTATION, &hdr_chain); if (res < 0 || hdr_chain.eh[res].protocol != IP_PROTOCOL_IPV6_FRAGMENTATION) { // this is a mangled packet - no fragmentation next0 = IP6_FULL_REASSEMBLY_NEXT_DROP; ip6_full_reass_add_trace (vm, node, NULL, bi0, NULL, PASSTHROUGH, ~0); goto skip_reass; } if (is_local && !rm->is_local_reass_enabled) { next0 = IP6_FULL_REASSEMBLY_NEXT_DROP; goto skip_reass; } frag_hdr = ip6_ext_next_header_offset (ip0, hdr_chain.eh[res].offset); vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset = hdr_chain.eh[res].offset; 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, &hdr_chain)) { next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR; goto skip_reass; } } if (!ip6_full_reass_verify_fragment_multiple_8 (vm, b0, frag_hdr) || !ip6_full_reass_verify_packet_size_lt_64k (vm, b0, frag_hdr)) { next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR; goto skip_reass; } int skip_bihash = 0; ip6_full_reass_kv_t kv; u8 do_handoff = 0; if (0 == ip6_frag_hdr_offset (frag_hdr) && !ip6_frag_hdr_more (frag_hdr)) { // this is atomic fragment and needs to be processed separately skip_bihash = 1; } else { 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, skip_bihash); 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; u32 counter = ~0; switch (ip6_full_reass_update ( vm, node, rm, rt, reass, &bi0, &next0, &error0, frag_hdr, is_custom_app, &handoff_thread_idx, skip_bihash)) { 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: counter = IP6_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG; break; case IP6_FULL_REASS_RC_NO_BUF: counter = IP6_ERROR_REASS_NO_BUF; break; case IP6_FULL_REASS_RC_INTERNAL_ERROR: counter = IP6_ERROR_REASS_INTERNAL_ERROR; break; case IP6_FULL_REASS_RC_INVALID_FRAG_LEN: counter = IP6_ERROR_REASS_INVALID_FRAG_LEN; break; } if (~0 != counter) { vlib_node_increment_counter (vm, node->node_index, counter, 1); ip6_full_reass_drop_all (vm, node, reass); ip6_full_reass_free (rm, rt, reass); goto next_packet; } } 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; } if (~0 != bi0) { skip_reass: to_next[0] = bi0; to_next += 1; n_left_to_next -= 1; /* bi0 might have been updated by reass_finalize, reload */ b0 = vlib_get_buffer (vm, bi0); if (IP6_ERROR_NONE != error0) { b0->error = node->errors[error0]; } if (next0 == IP6_FULL_REASSEMBLY_NEXT_HANDOFF) { if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) { ip6_full_reass_add_trace ( vm, node, NULL, bi0, frag_hdr, HANDOFF, vnet_buffer (b0)->ip.reass.owner_thread_index); } } else if (is_feature && IP6_ERROR_NONE == error0) { 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 */, false /* is_local */); } 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", }, }; VLIB_NODE_FN (ip6_local_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 */, true /* is_local */); } VLIB_REGISTER_NODE (ip6_local_full_reass_node) = { .name = "ip6-local-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-local-full-reassembly-handoff", }, }; 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 */, false /* is_local */); } 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", }, }; 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, }; #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 int 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; } return (BIHASH_WALK_CONTINUE); } 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_local_full_reass_node.index); rm->is_local_reass_enabled = 1; rm->fq_index = vlib_frame_queue_main_init (ip6_full_reass_node.index, 0); rm->fq_local_index = vlib_frame_queue_main_init (ip6_local_full_reass_node.index, 0); rm->fq_feature_index = vlib_frame_queue_main_init (ip6_full_reass_node_feature.index, 0); rm->feature_use_refcount_per_intf = NULL; 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, CLIB_UNUSED (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 */ /* fallthrough */ case IP6_EVENT_CONFIG_CHANGED: /* nothing to do here */ 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); 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); } } int *i; 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, reass, &icmp_bi); if (~0 != icmp_bi) vec_add1 (vec_icmp_bi, icmp_bi); ip6_full_reass_free (rm, rt, reass); } 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; } 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, }; 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) { pool_foreach (reass, rt->pool) { vlib_cli_output (vm, "%U", format_ip6_full_reass, vm, reass); } } 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 full IP6 reassemblies per worker-thread: %lu\n", (long unsigned) rm->max_reass_n); vlib_cli_output (vm, "Maximum configured amount of fragments " "per full IP6 reassembly: %lu\n", (long unsigned) rm->max_reass_len); vlib_cli_output (vm, "Maximum configured full IP6 reassembly timeout: %lums\n", (long unsigned) rm->timeout_ms); vlib_cli_output (vm, "Maximum configured full IP6 reassembly expire walk interval: %lums\n", (long unsigned) rm->expire_walk_interval_ms); vlib_cli_output (vm, "Buffers in use: %lu\n", (long unsigned) sum_buffers_n); return 0; } 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, }; #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, bool is_local) { 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; if (is_feature) { fq_index = rm->fq_feature_index; } else { if (is_local) { fq_index = rm->fq_local_index; } else { fq_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, node, 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 */, false /* is_local */); } 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_local_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 */, true /* is_feature */); } VLIB_REGISTER_NODE (ip6_local_full_reassembly_handoff_node) = { .name = "ip6-local-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 */, false /* is_local */); } 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", }, }; #ifndef CLIB_MARCH_VARIANT int ip6_full_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable) { ip6_full_reass_main_t *rm = &ip6_full_reass_main; vec_validate (rm->feature_use_refcount_per_intf, sw_if_index); if (is_enable) { if (!rm->feature_use_refcount_per_intf[sw_if_index]) { ++rm->feature_use_refcount_per_intf[sw_if_index]; return vnet_feature_enable_disable ("ip6-unicast", "ip6-full-reassembly-feature", sw_if_index, 1, 0, 0); } ++rm->feature_use_refcount_per_intf[sw_if_index]; } else { --rm->feature_use_refcount_per_intf[sw_if_index]; if (!rm->feature_use_refcount_per_intf[sw_if_index]) return vnet_feature_enable_disable ("ip6-unicast", "ip6-full-reassembly-feature", sw_if_index, 0, 0, 0); } return -1; } void ip6_local_full_reass_enable_disable (int enable) { if (enable) { if (!ip6_full_reass_main.is_local_reass_enabled) { ip6_full_reass_main.is_local_reass_enabled = 1; ip6_register_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION, ip6_local_full_reass_node.index); } } else { if (ip6_full_reass_main.is_local_reass_enabled) { ip6_full_reass_main.is_local_reass_enabled = 0; ip6_unregister_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION); } } } int ip6_local_full_reass_enabled () { return ip6_full_reass_main.is_local_reass_enabled; } #endif /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */


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