diff options
Diffstat (limited to 'src/vnet/ip/reass/ip6_full_reass.c')
| -rw-r--r-- | src/vnet/ip/reass/ip6_full_reass.c | 157 |
1 files changed, 116 insertions, 41 deletions
diff --git a/src/vnet/ip/reass/ip6_full_reass.c b/src/vnet/ip/reass/ip6_full_reass.c index dbe52d3caf1..3bc5faa5d9d 100644 --- a/src/vnet/ip/reass/ip6_full_reass.c +++ b/src/vnet/ip/reass/ip6_full_reass.c @@ -204,6 +204,7 @@ typedef enum typedef enum { RANGE_NEW, + RANGE_DISCARD, RANGE_OVERLAP, ICMP_ERROR_RT_EXCEEDED, ICMP_ERROR_FL_TOO_BIG, @@ -297,6 +298,10 @@ format_ip6_full_reass_trace (u8 * s, va_list * args) s = format (s, "\n%Unew %U", format_white_space, indent, format_ip6_full_reass_range_trace, &t->trace_range); break; + case RANGE_DISCARD: + s = format (s, "\n%Udiscard %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); @@ -418,67 +423,64 @@ ip6_full_reass_free (ip6_full_reass_main_t * rm, ip6_full_reass_free_ctx (rt, reass); } +/* n_left_to_next, and to_next are taken as input params, as this function + * could be called from a graphnode, where its managing local copy of these + * variables, and ignoring those and still trying to enqueue the buffers + * with local variables would cause either buffer leak or corruption */ always_inline void ip6_full_reass_drop_all (vlib_main_t *vm, vlib_node_runtime_t *node, - ip6_full_reass_t *reass, u32 offending_bi) + ip6_full_reass_t *reass, u32 *n_left_to_next, + u32 **to_next) { 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) + + if (~0 != range_bi) { - vec_add1 (to_free, bi); - if (bi == offending_bi) - { - offending_bi = ~0; - } - 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; - } + vec_add1 (to_free, range_bi); } range_bi = range_vnb->ip.reass.next_range_bi; } - if (~0 != offending_bi) - { - vec_add1 (to_free, offending_bi); - } + /* send to next_error_index */ - if (~0 != reass->error_next_index) + if (~0 != reass->error_next_index && + reass->error_next_index < node->n_next_nodes) { - u32 n_left_to_next, *to_next, next_index; + u32 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); + 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) + 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_buffer_t *b = vlib_get_buffer (vm, bi); + if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED)) + { + ip6_full_reass_add_trace (vm, node, reass, bi, NULL, + RANGE_DISCARD, ~0); + } + *to_next[0] = bi; + (*to_next) += 1; + (*n_left_to_next) -= 1; } } - vlib_put_next_frame (vm, node, next_index, n_left_to_next); + vlib_put_next_frame (vm, node, next_index, (*n_left_to_next)); } } else @@ -489,8 +491,65 @@ ip6_full_reass_drop_all (vlib_main_t *vm, vlib_node_runtime_t *node, } 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) +sanitize_reass_buffers_add_missing (vlib_main_t *vm, ip6_full_reass_t *reass, + u32 *bi0) +{ + u32 range_bi = reass->first_bi; + vlib_buffer_t *range_b; + vnet_buffer_opaque_t *range_vnb; + + while (~0 != range_bi) + { + range_b = vlib_get_buffer (vm, range_bi); + range_vnb = vnet_buffer (range_b); + u32 bi = range_bi; + if (~0 != bi) + { + if (bi == *bi0) + *bi0 = ~0; + if (range_b->flags & VLIB_BUFFER_NEXT_PRESENT) + { + u32 _bi = bi; + vlib_buffer_t *_b = vlib_get_buffer (vm, _bi); + while (_b->flags & VLIB_BUFFER_NEXT_PRESENT) + { + if (_b->next_buffer != range_vnb->ip.reass.next_range_bi) + { + _bi = _b->next_buffer; + _b = vlib_get_buffer (vm, _bi); + } + else + { + _b->flags &= ~VLIB_BUFFER_NEXT_PRESENT; + break; + } + } + } + range_bi = range_vnb->ip.reass.next_range_bi; + } + } + if (*bi0 != ~0) + { + vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0); + vnet_buffer_opaque_t *fvnb = vnet_buffer (fb); + if (~0 != reass->first_bi) + { + fvnb->ip.reass.next_range_bi = reass->first_bi; + reass->first_bi = *bi0; + } + else + { + reass->first_bi = *bi0; + fvnb->ip.reass.next_range_bi = ~0; + } + *bi0 = ~0; + } +} + +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, + u32 *n_left_to_next, u32 **to_next) { if (~0 == reass->first_bi) { @@ -523,7 +582,7 @@ ip6_full_reass_on_timeout (vlib_main_t * vm, vlib_node_runtime_t * node, 0); } } - ip6_full_reass_drop_all (vm, node, reass, ~0); + ip6_full_reass_drop_all (vm, node, reass, n_left_to_next, to_next); } always_inline ip6_full_reass_t * @@ -531,7 +590,8 @@ 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) + u8 *do_handoff, int skip_bihash, + u32 *n_left_to_next, u32 **to_next) { ip6_full_reass_t *reass; f64 now; @@ -556,7 +616,8 @@ again: if (now > reass->last_heard + rm->timeout) { - ip6_full_reass_on_timeout (vm, node, reass, icmp_bi); + ip6_full_reass_on_timeout (vm, node, reass, icmp_bi, n_left_to_next, + to_next); ip6_full_reass_free (rm, rt, reass); reass = NULL; } @@ -1201,7 +1262,8 @@ ip6_full_reassembly_inline (vlib_main_t *vm, vlib_node_runtime_t *node, } ip6_full_reass_t *reass = ip6_full_reass_find_or_create ( - vm, node, rm, rt, &kv, &icmp_bi, &do_handoff, skip_bihash); + vm, node, rm, rt, &kv, &icmp_bi, &do_handoff, skip_bihash, + &n_left_to_next, &to_next); if (reass) { @@ -1240,21 +1302,31 @@ ip6_full_reassembly_inline (vlib_main_t *vm, vlib_node_runtime_t *node, 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; case IP6_FULL_REASS_RC_OVERLAP: counter = IP6_ERROR_REASS_OVERLAPPING_FRAGMENT; break; + case IP6_FULL_REASS_RC_INTERNAL_ERROR: + counter = IP6_ERROR_REASS_INTERNAL_ERROR; + /* Sanitization is needed in internal error cases only, as + * the incoming packet is already dropped in other cases, + * also adding bi0 back to the reassembly list, fixes the + * leaking of buffers during internal errors. + * + * Also it doesnt make sense to send these buffers custom + * app, these fragments are with internal errors */ + sanitize_reass_buffers_add_missing (vm, reass, &bi0); + reass->error_next_index = ~0; + break; } if (~0 != counter) { vlib_node_increment_counter (vm, node->node_index, counter, 1); - ip6_full_reass_drop_all (vm, node, reass, bi0); + ip6_full_reass_drop_all (vm, node, reass, &n_left_to_next, + &to_next); ip6_full_reass_free (rm, rt, reass); goto next_packet; break; @@ -1636,6 +1708,8 @@ ip6_full_reass_walk_expired (vlib_main_t *vm, vlib_node_runtime_t *node, int index; const uword nthreads = vlib_num_workers () + 1; u32 *vec_icmp_bi = NULL; + u32 n_left_to_next, *to_next; + for (thread_index = 0; thread_index < nthreads; ++thread_index) { ip6_full_reass_per_thread_t *rt = @@ -1676,7 +1750,8 @@ ip6_full_reass_walk_expired (vlib_main_t *vm, vlib_node_runtime_t *node, { 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); + ip6_full_reass_on_timeout (vm, node, reass, &icmp_bi, + &n_left_to_next, &to_next); if (~0 != icmp_bi) vec_add1 (vec_icmp_bi, icmp_bi); |