diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/vnet/ip/ip4_error.h | 3 | ||||
| -rw-r--r-- | src/vnet/ip/ip4_reassembly.c | 247 | ||||
| -rw-r--r-- | src/vnet/ip/ip6_error.h | 3 | ||||
| -rw-r--r-- | src/vnet/ip/ip6_reassembly.c | 147 |
4 files changed, 272 insertions, 128 deletions
diff --git a/src/vnet/ip/ip4_error.h b/src/vnet/ip/ip4_error.h index 15828e39ac5..338d91ec0ae 100644 --- a/src/vnet/ip/ip4_error.h +++ b/src/vnet/ip/ip4_error.h @@ -87,7 +87,8 @@ _ (REASS_DUPLICATE_FRAGMENT, "duplicate/overlapping fragments") \ _ (REASS_LIMIT_REACHED, "drops due to concurrent reassemblies limit") \ _ (REASS_TIMEOUT, "fragments dropped due to reassembly timeout") \ - _ (REASS_MALFORMED_PACKET, "malformed packets") + _ (REASS_MALFORMED_PACKET, "malformed packets") \ + _ (REASS_INTERNAL_ERROR, "drops due to internal reassembly error") typedef enum { diff --git a/src/vnet/ip/ip4_reassembly.c b/src/vnet/ip/ip4_reassembly.c index 3e9d22f7e55..4bf39144ddb 100644 --- a/src/vnet/ip/ip4_reassembly.c +++ b/src/vnet/ip/ip4_reassembly.c @@ -54,7 +54,11 @@ #define IP4_REASS_DEBUG_BUFFER(...) #endif -static vlib_node_registration_t ip4_reass_node; +typedef enum +{ + IP4_REASS_RC_OK, + IP4_REASS_RC_INTERNAL_ERROR, +} ip4_reass_rc_t; typedef struct { @@ -74,36 +78,20 @@ typedef struct } ip4_reass_key_t; always_inline u32 -ip4_reass_buffer_get_data_offset_no_check (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 u32 ip4_reass_buffer_get_data_offset (vlib_buffer_t * b) { vnet_buffer_opaque_t *vnb = vnet_buffer (b); - ASSERT (vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first); - return ip4_reass_buffer_get_data_offset_no_check (b); + return vnb->ip.reass.range_first - vnb->ip.reass.fragment_first; } always_inline u16 -ip4_reass_buffer_get_data_len_no_check (vlib_buffer_t * b) +ip4_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 + ip4_reass_buffer_get_data_offset (b)) + 1; } -always_inline u16 -ip4_reass_buffer_get_data_len (vlib_buffer_t * b) -{ - vnet_buffer_opaque_t *vnb = vnet_buffer (b); - ASSERT (vnb->ip.reass.range_last > vnb->ip.reass.fragment_first); - return ip4_reass_buffer_get_data_len_no_check (b); -} - typedef struct { // hash table key @@ -205,8 +193,8 @@ ip4_reass_trace_details (vlib_main_t * vm, u32 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 = ip4_reass_buffer_get_data_offset_no_check (b); - trace->data_len = ip4_reass_buffer_get_data_len_no_check (b); + trace->data_offset = ip4_reass_buffer_get_data_offset (b); + trace->data_len = ip4_reass_buffer_get_data_len (b); trace->range_bi = bi; } @@ -392,14 +380,13 @@ ip4_reass_find_or_create (vlib_main_t * vm, ip4_reass_main_t * rm, return reass; } -always_inline void +always_inline ip4_reass_rc_t ip4_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node, ip4_reass_main_t * rm, ip4_reass_per_thread_t * rt, ip4_reass_t * reass, u32 * bi0, u32 * next0, u32 * error0, u32 ** vec_drop_compress, u32 ** vec_drop_overlap, bool is_feature) { - ASSERT (~0 != reass->first_bi); vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi); vlib_buffer_t *last_b = NULL; u32 sub_chain_bi = reass->first_bi; @@ -411,6 +398,13 @@ ip4_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node, u32 tmp_bi = sub_chain_bi; vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi); ip4_header_t *ip = vlib_buffer_get_current (tmp); + 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)) + { + return IP4_REASS_RC_INTERNAL_ERROR; + } + u32 data_len = ip4_reass_buffer_get_data_len (tmp); u32 trim_front = ip4_header_bytes (ip) + ip4_reass_buffer_get_data_offset (tmp); @@ -419,11 +413,17 @@ ip4_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node, if (tmp_bi == reass->first_bi) { /* first buffer - keep ip4 header */ - ASSERT (0 == ip4_reass_buffer_get_data_offset (tmp)); + if (0 != ip4_reass_buffer_get_data_offset (tmp)) + { + return IP4_REASS_RC_INTERNAL_ERROR; + } trim_front = 0; trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len - ip4_header_bytes (ip); - ASSERT (vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0); + if (!(vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0)) + { + return IP4_REASS_RC_INTERNAL_ERROR; + } } u32 keep_data = vlib_buffer_length_in_chain (vm, tmp) - trim_front - trim_end; @@ -438,7 +438,10 @@ ip4_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node, vec_add1 (*vec_drop_compress, tmp_bi); ++dropped_cnt; trim_front -= tmp->current_length; - ASSERT (tmp->flags & VLIB_BUFFER_NEXT_PRESENT); + if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT)) + { + return IP4_REASS_RC_INTERNAL_ERROR; + } tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT; tmp_bi = tmp->next_buffer; tmp = vlib_get_buffer (vm, tmp_bi); @@ -466,14 +469,20 @@ ip4_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node, else { keep_data -= tmp->current_length; - ASSERT (tmp->flags & VLIB_BUFFER_NEXT_PRESENT); + if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT)) + { + return IP4_REASS_RC_INTERNAL_ERROR; + } } total_length += tmp->current_length; } else { vec_add1 (*vec_drop_overlap, tmp_bi); - ASSERT (reass->first_bi != tmp_bi); + if (reass->first_bi == tmp_bi) + { + return IP4_REASS_RC_INTERNAL_ERROR; + } ++dropped_cnt; } if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT) @@ -492,11 +501,16 @@ ip4_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node, } while (~0 != sub_chain_bi); - ASSERT (last_b != NULL); + if (!last_b) + { + return IP4_REASS_RC_INTERNAL_ERROR; + } last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT; - ASSERT (rt->buffers_n >= (buf_cnt - dropped_cnt)); rt->buffers_n -= buf_cnt - dropped_cnt; - ASSERT (total_length >= first_b->current_length); + if (total_length < first_b->current_length) + { + return IP4_REASS_RC_INTERNAL_ERROR; + } total_length -= first_b->current_length; first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID; first_b->total_length_not_including_first_buffer = total_length; @@ -551,6 +565,7 @@ ip4_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node, *error0 = IP4_ERROR_NONE; ip4_reass_free (rm, rt, reass); reass = NULL; + return IP4_REASS_RC_OK; } always_inline u32 @@ -572,14 +587,13 @@ ip4_reass_get_buffer_chain_length (vlib_main_t * vm, vlib_buffer_t * b) return len; } -always_inline void +always_inline ip4_reass_rc_t ip4_reass_insert_range_in_chain (vlib_main_t * vm, ip4_reass_main_t * rm, ip4_reass_per_thread_t * rt, ip4_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) @@ -597,11 +611,18 @@ ip4_reass_insert_range_in_chain (vlib_main_t * vm, } reass->first_bi = new_next_bi; } + vnet_buffer_opaque_t *vnb = vnet_buffer (new_next_b); + if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) && + !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first)) + { + return IP4_REASS_RC_INTERNAL_ERROR; + } reass->data_len += ip4_reass_buffer_get_data_len (new_next_b); rt->buffers_n += ip4_reass_get_buffer_chain_length (vm, new_next_b); + return IP4_REASS_RC_OK; } -always_inline void +always_inline ip4_reass_rc_t ip4_reass_remove_range_from_chain (vlib_main_t * vm, vlib_node_runtime_t * node, ip4_reass_main_t * rm, @@ -615,13 +636,22 @@ ip4_reass_remove_range_from_chain (vlib_main_t * vm, { vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi); vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b); - ASSERT (prev_vnb->ip.reass.next_range_bi == discard_bi); + if (!(prev_vnb->ip.reass.next_range_bi == discard_bi)) + { + return IP4_REASS_RC_INTERNAL_ERROR; + } prev_vnb->ip.reass.next_range_bi = discard_vnb->ip.reass.next_range_bi; } else { reass->first_bi = discard_vnb->ip.reass.next_range_bi; } + vnet_buffer_opaque_t *vnb = vnet_buffer (discard_b); + if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) && + !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first)) + { + return IP4_REASS_RC_INTERNAL_ERROR; + } reass->data_len -= ip4_reass_buffer_get_data_len (discard_b); while (1) { @@ -642,19 +672,20 @@ ip4_reass_remove_range_from_chain (vlib_main_t * vm, break; } } + return IP4_REASS_RC_OK; } -always_inline void +always_inline ip4_reass_rc_t ip4_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node, ip4_reass_main_t * rm, ip4_reass_per_thread_t * rt, ip4_reass_t * reass, u32 * bi0, u32 * next0, u32 * error0, u32 ** vec_drop_overlap, u32 ** vec_drop_compress, bool is_feature) { + ip4_reass_rc_t rc = IP4_REASS_RC_OK; int consumed = 0; vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0); ip4_header_t *fip = vlib_buffer_get_current (fb); - ASSERT (fb->current_length >= sizeof (*fip)); vnet_buffer_opaque_t *fvnb = vnet_buffer (fb); reass->next_index = fvnb->ip.reass.next_index; // store next_index before it's overwritten const u32 fragment_first = ip4_get_fragment_offset_bytes (fip); @@ -676,15 +707,20 @@ ip4_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node, if (~0 == reass->first_bi) { // starting a new reassembly - ip4_reass_insert_range_in_chain (vm, rm, rt, reass, prev_range_bi, - *bi0); + rc = + ip4_reass_insert_range_in_chain (vm, rm, rt, reass, prev_range_bi, + *bi0); + if (IP4_REASS_RC_OK != rc) + { + return rc; + } if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED)) { ip4_reass_add_trace (vm, node, rm, reass, *bi0, RANGE_NEW, 0); } *bi0 = ~0; reass->min_fragment_length = clib_net_to_host_u16 (fip->length); - return; + return IP4_REASS_RC_OK; } reass->min_fragment_length = clib_min (clib_net_to_host_u16 (fip->length), fvnb->ip.reass.estimated_mtu); @@ -701,8 +737,13 @@ ip4_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node, ~0 == candidate_range_bi) { // special case - this fragment falls beyond all known ranges - ip4_reass_insert_range_in_chain (vm, rm, rt, reass, - prev_range_bi, *bi0); + rc = + ip4_reass_insert_range_in_chain (vm, rm, rt, reass, + prev_range_bi, *bi0); + if (IP4_REASS_RC_OK != rc) + { + return rc; + } consumed = 1; break; } @@ -711,8 +752,13 @@ ip4_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node, if (fragment_last < candidate_vnb->ip.reass.range_first) { // this fragment ends before candidate range without any overlap - ip4_reass_insert_range_in_chain (vm, rm, rt, reass, prev_range_bi, - *bi0); + rc = + ip4_reass_insert_range_in_chain (vm, rm, rt, reass, prev_range_bi, + *bi0); + if (IP4_REASS_RC_OK != rc) + { + return rc; + } consumed = 1; } else @@ -736,7 +782,10 @@ ip4_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node, if (overlap < ip4_reass_buffer_get_data_len (candidate_b)) { candidate_vnb->ip.reass.range_first += overlap; - ASSERT (reass->data_len >= overlap); + if (reass->data_len < overlap) + { + return IP4_REASS_RC_INTERNAL_ERROR; + } reass->data_len -= overlap; if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED)) { @@ -744,8 +793,13 @@ ip4_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node, candidate_range_bi, RANGE_SHRINK, overlap); } - ip4_reass_insert_range_in_chain (vm, rm, rt, reass, - prev_range_bi, *bi0); + rc = + ip4_reass_insert_range_in_chain (vm, rm, rt, reass, + prev_range_bi, *bi0); + if (IP4_REASS_RC_OK != rc) + { + return rc; + } consumed = 1; } else @@ -770,9 +824,14 @@ ip4_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node, else { // special case - last range discarded - ip4_reass_insert_range_in_chain (vm, rm, rt, reass, - candidate_range_bi, - *bi0); + rc = + ip4_reass_insert_range_in_chain (vm, rm, rt, reass, + candidate_range_bi, + *bi0); + if (IP4_REASS_RC_OK != rc) + { + return rc; + } consumed = 1; } } @@ -789,10 +848,15 @@ ip4_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node, { u32 next_range_bi = candidate_vnb->ip.reass.next_range_bi; // discard candidate range, probe next range - ip4_reass_remove_range_from_chain (vm, node, rm, - vec_drop_overlap, reass, - prev_range_bi, - candidate_range_bi); + rc = + ip4_reass_remove_range_from_chain (vm, node, rm, + vec_drop_overlap, reass, + prev_range_bi, + candidate_range_bi); + if (IP4_REASS_RC_OK != rc) + { + return rc; + } if (~0 != next_range_bi) { candidate_range_bi = next_range_bi; @@ -801,8 +865,13 @@ ip4_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node, else { // special case - last range discarded - ip4_reass_insert_range_in_chain (vm, rm, rt, reass, - prev_range_bi, *bi0); + rc = + ip4_reass_insert_range_in_chain (vm, rm, rt, reass, + prev_range_bi, *bi0); + if (IP4_REASS_RC_OK != rc) + { + return rc; + } consumed = 1; } } @@ -819,8 +888,9 @@ ip4_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node, if (~0 != reass->last_packet_octet && reass->data_len == reass->last_packet_octet + 1) { - ip4_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0, - vec_drop_compress, vec_drop_overlap, is_feature); + return ip4_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0, + vec_drop_compress, vec_drop_overlap, + is_feature); } else { @@ -834,6 +904,7 @@ ip4_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node, *error0 = IP4_ERROR_REASS_DUPLICATE_FRAGMENT; } } + return rc; } always_inline uword @@ -851,9 +922,11 @@ ip4_reassembly_inline (vlib_main_t * vm, next_index = node->cached_next_index; static u32 *vec_drop_timeout = NULL; // indexes of buffers which timed out static u32 *vec_drop_overlap = NULL; // indexes of buffers which were discarded due to overlap + static u32 *vec_drop_internal_error = NULL; // indexes of buffers which were discarded due to internal errors static u32 *vec_drop_compress = NULL; // indexes of buffers dicarded due to buffer compression - while (n_left_from > 0 || vec_len (vec_drop_timeout) > 0 || - vec_len (vec_drop_overlap) > 0 || vec_len (vec_drop_compress) > 0) + while (n_left_from > 0 || vec_len (vec_drop_timeout) > 0 + || vec_len (vec_drop_overlap) > 0 || vec_len (vec_drop_compress) > 0 + || vec_len (vec_drop_internal_error) > 0) { vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); @@ -869,7 +942,6 @@ ip4_reassembly_inline (vlib_main_t * vm, n_left_to_next, bi, IP4_REASSEMBLY_NEXT_DROP); IP4_REASS_DEBUG_BUFFER (bi, enqueue_drop_timeout); - ASSERT (rt->buffers_n > 0); --rt->buffers_n; } @@ -885,7 +957,6 @@ ip4_reassembly_inline (vlib_main_t * vm, n_left_to_next, bi, IP4_REASSEMBLY_NEXT_DROP); IP4_REASS_DEBUG_BUFFER (bi, enqueue_drop_duplicate_fragment); - ASSERT (rt->buffers_n > 0); --rt->buffers_n; } @@ -901,10 +972,22 @@ ip4_reassembly_inline (vlib_main_t * vm, n_left_to_next, bi, IP4_REASSEMBLY_NEXT_DROP); IP4_REASS_DEBUG_BUFFER (bi, enqueue_drop_compress); - ASSERT (rt->buffers_n > 0); --rt->buffers_n; } - + while (vec_len (vec_drop_internal_error) > 0 && n_left_to_next > 0) + { + u32 bi = vec_pop (vec_drop_internal_error); + vlib_buffer_t *b = vlib_get_buffer (vm, bi); + b->error = node->errors[IP4_ERROR_REASS_INTERNAL_ERROR]; + to_next[0] = bi; + to_next += 1; + n_left_to_next -= 1; + vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, + n_left_to_next, bi, + IP4_REASSEMBLY_NEXT_DROP); + IP4_REASS_DEBUG_BUFFER (bi, enqueue_drop_internal_error); + --rt->buffers_n; + } while (n_left_from > 0 && n_left_to_next > 0) { u32 bi0; @@ -943,12 +1026,11 @@ ip4_reassembly_inline (vlib_main_t * vm, { ip4_reass_key_t k; k.as_u64[0] = - (u64) vnet_buffer (b0)->sw_if_index[VLIB_RX] << 32 | (u64) - ip0->src_address.as_u32; + (u64) vnet_buffer (b0)->sw_if_index[VLIB_RX] | + (u64) ip0->src_address.as_u32 << 32; k.as_u64[1] = - (u64) ip0->dst_address. - as_u32 << 32 | (u64) ip0->fragment_id << 16 | (u64) ip0-> - protocol << 8; + (u64) ip0->dst_address.as_u32 | + (u64) ip0->fragment_id << 32 | (u64) ip0->protocol << 48; ip4_reass_t *reass = ip4_reass_find_or_create (vm, rm, rt, &k, @@ -956,9 +1038,22 @@ ip4_reassembly_inline (vlib_main_t * vm, if (reass) { - ip4_reass_update (vm, node, rm, rt, reass, &bi0, &next0, - &error0, &vec_drop_overlap, - &vec_drop_compress, is_feature); + switch (ip4_reass_update + (vm, node, rm, rt, reass, &bi0, &next0, &error0, + &vec_drop_overlap, &vec_drop_compress, + is_feature)) + { + case IP4_REASS_RC_OK: + /* nothing to do here */ + break; + case IP4_REASS_RC_INTERNAL_ERROR: + /* drop everything and start with a clean slate */ + ip4_reass_on_timeout (vm, rm, reass, + &vec_drop_internal_error); + ip4_reass_free (rm, rt, reass); + goto next_packet; + break; + } } else { @@ -985,6 +1080,7 @@ ip4_reassembly_inline (vlib_main_t * vm, IP4_REASS_DEBUG_BUFFER (bi0, enqueue_next); } + next_packet: from += 1; n_left_from -= 1; } @@ -1264,8 +1360,7 @@ ip4_reass_walk_expired (vlib_main_t * vm, } ip4_reass_on_timeout (vm, rm, reass, &vec_drop_timeout); u32 after = vec_len (vec_drop_timeout); - ASSERT (rt->buffers_n >= (after - before)); - rt->buffers_n -= (after - before); + rt->buffers_n -= (after - before); ip4_reass_free (rm, rt, reass); } /* *INDENT-ON* */ @@ -1363,8 +1458,8 @@ format_ip4_reass (u8 * s, va_list * args) "fragment[%u, %u]\n", counter, vnb->ip.reass.range_first, vnb->ip.reass.range_last, bi, - ip4_reass_buffer_get_data_offset_no_check (b), - ip4_reass_buffer_get_data_len_no_check (b), + ip4_reass_buffer_get_data_offset (b), + ip4_reass_buffer_get_data_len (b), vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last); if (b->flags & VLIB_BUFFER_NEXT_PRESENT) { diff --git a/src/vnet/ip/ip6_error.h b/src/vnet/ip/ip6_error.h index cc5afb93102..6a20de4f18e 100644 --- a/src/vnet/ip/ip6_error.h +++ b/src/vnet/ip/ip6_error.h @@ -81,7 +81,8 @@ _ (REASS_DUPLICATE_FRAGMENT, "duplicate fragments") \ _ (REASS_OVERLAPPING_FRAGMENT, "overlapping fragments") \ _ (REASS_LIMIT_REACHED, "drops due to concurrent reassemblies limit") \ - _ (REASS_TIMEOUT, "fragments dropped due to reassembly timeout") + _ (REASS_TIMEOUT, "fragments dropped due to reassembly timeout") \ + _ (REASS_INTERNAL_ERROR, "drops due to internal reassembly error") typedef enum { diff --git a/src/vnet/ip/ip6_reassembly.c b/src/vnet/ip/ip6_reassembly.c index de9fbe52a75..ab5b42a2f00 100644 --- a/src/vnet/ip/ip6_reassembly.c +++ b/src/vnet/ip/ip6_reassembly.c @@ -32,7 +32,11 @@ #define IP6_REASS_MAX_REASSEMBLIES_DEFAULT 1024 #define IP6_REASS_HT_LOAD_FACTOR (0.75) -static vlib_node_registration_t ip6_reass_node; +typedef enum +{ + IP6_REASS_RC_OK, + IP6_REASS_RC_INTERNAL_ERROR, +} ip6_reass_rc_t; typedef struct { @@ -52,36 +56,20 @@ typedef struct } ip6_reass_key_t; always_inline u32 -ip6_reass_buffer_get_data_offset_no_check (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 u32 ip6_reass_buffer_get_data_offset (vlib_buffer_t * b) { vnet_buffer_opaque_t *vnb = vnet_buffer (b); - ASSERT (vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first); - return ip6_reass_buffer_get_data_offset_no_check (b); + return vnb->ip.reass.range_first - vnb->ip.reass.fragment_first; } always_inline u16 -ip6_reass_buffer_get_data_len_no_check (vlib_buffer_t * b) +ip6_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_reass_buffer_get_data_offset (b)) + 1; } -always_inline u16 -ip6_reass_buffer_get_data_len (vlib_buffer_t * b) -{ - vnet_buffer_opaque_t *vnb = vnet_buffer (b); - ASSERT (vnb->ip.reass.range_last > vnb->ip.reass.fragment_first); - return ip6_reass_buffer_get_data_len_no_check (b); -} - typedef struct { // hash table key @@ -188,8 +176,8 @@ ip6_reass_trace_details (vlib_main_t * vm, u32 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_reass_buffer_get_data_offset_no_check (b); - trace->data_len = ip6_reass_buffer_get_data_len_no_check (b); + trace->data_offset = ip6_reass_buffer_get_data_offset (b); + trace->data_len = ip6_reass_buffer_get_data_len (b); trace->range_bi = bi; } @@ -430,13 +418,12 @@ ip6_reass_find_or_create (vlib_main_t * vm, vlib_node_runtime_t * node, return reass; } -always_inline void +always_inline ip6_reass_rc_t ip6_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node, ip6_reass_main_t * rm, ip6_reass_per_thread_t * rt, ip6_reass_t * reass, u32 * bi0, u32 * next0, u32 * error0, u32 ** vec_drop_compress, bool is_feature) { - ASSERT (~0 != reass->first_bi); *bi0 = reass->first_bi; *error0 = IP6_ERROR_NONE; ip6_frag_hdr_t *frag_hdr; @@ -449,6 +436,13 @@ ip6_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node, { 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)) + { + return IP6_REASS_RC_INTERNAL_ERROR; + } + u32 data_len = ip6_reass_buffer_get_data_len (tmp); u32 trim_front = vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr) + ip6_reass_buffer_get_data_offset (tmp); @@ -457,12 +451,18 @@ ip6_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node, if (tmp_bi == reass->first_bi) { /* first buffer - keep ip6 header */ - ASSERT (0 == ip6_reass_buffer_get_data_offset (tmp)); + if (0 != ip6_reass_buffer_get_data_offset (tmp)) + { + return IP6_REASS_RC_INTERNAL_ERROR; + } 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)); - ASSERT (vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0); + if (!(vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0)) + { + return IP6_REASS_RC_INTERNAL_ERROR; + } } u32 keep_data = vlib_buffer_length_in_chain (vm, tmp) - trim_front - trim_end; @@ -477,7 +477,10 @@ ip6_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node, vec_add1 (*vec_drop_compress, tmp_bi); ++dropped_cnt; trim_front -= tmp->current_length; - ASSERT (tmp->flags & VLIB_BUFFER_NEXT_PRESENT); + if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT)) + { + return IP6_REASS_RC_INTERNAL_ERROR; + } tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT; tmp_bi = tmp->next_buffer; tmp = vlib_get_buffer (vm, tmp_bi); @@ -505,14 +508,20 @@ ip6_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node, else { keep_data -= tmp->current_length; - ASSERT (tmp->flags & VLIB_BUFFER_NEXT_PRESENT); + if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT)) + { + return IP6_REASS_RC_INTERNAL_ERROR; + } } total_length += tmp->current_length; } else { vec_add1 (*vec_drop_compress, tmp_bi); - ASSERT (reass->first_bi != tmp_bi); + if (reass->first_bi == tmp_bi) + { + return IP6_REASS_RC_INTERNAL_ERROR; + } ++dropped_cnt; } if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT) @@ -531,10 +540,16 @@ ip6_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node, } while (~0 != sub_chain_bi); - ASSERT (last_b != NULL); + if (!last_b) + { + return IP6_REASS_RC_INTERNAL_ERROR; + } last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT; vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi); - ASSERT (total_length >= first_b->current_length); + if (total_length < first_b->current_length) + { + return IP6_REASS_RC_INTERNAL_ERROR; + } total_length -= first_b->current_length; first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID; first_b->total_length_not_including_first_buffer = total_length; @@ -553,7 +568,10 @@ ip6_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node, { ip->protocol = frag_hdr->next_hdr; } - ASSERT ((u8 *) frag_hdr - (u8 *) ip == ip6_frag_hdr_offset); + if (!((u8 *) frag_hdr - (u8 *) ip == ip6_frag_hdr_offset)) + { + return IP6_REASS_RC_INTERNAL_ERROR; + } memmove (frag_hdr, (u8 *) frag_hdr + sizeof (*frag_hdr), first_b->current_length - ip6_frag_hdr_offset - sizeof (ip6_frag_hdr_t)); @@ -603,6 +621,7 @@ ip6_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node, vnet_buffer (first_b)->ip.reass.estimated_mtu = reass->min_fragment_length; ip6_reass_free (rm, rt, reass); reass = NULL; + return IP6_REASS_RC_OK; } always_inline u32 @@ -652,7 +671,7 @@ ip6_reass_insert_range_in_chain (vlib_main_t * vm, ip6_reass_main_t * rm, rt->buffers_n += ip6_reass_get_buffer_chain_length (vm, new_next_b); } -always_inline void +always_inline ip6_reass_rc_t ip6_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node, ip6_reass_main_t * rm, ip6_reass_per_thread_t * rt, ip6_reass_t * reass, u32 * bi0, u32 * next0, @@ -667,9 +686,13 @@ ip6_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node, 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); - ASSERT (fb->current_length > sizeof (*fip)); - ASSERT (fvnb->ip.reass.ip6_frag_hdr_offset > 0 && - fvnb->ip.reass.ip6_frag_hdr_offset < fb->current_length); + 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_REASS_RC_INTERNAL_ERROR; + } + u32 fragment_first = fvnb->ip.reass.fragment_first = ip6_frag_hdr_offset_bytes (frag_hdr); u32 fragment_length = @@ -698,7 +721,7 @@ ip6_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node, } reass->min_fragment_length = clib_net_to_host_u16 (fip->payload_length); *bi0 = ~0; - return; + return IP6_REASS_RC_OK; } reass->min_fragment_length = clib_min (clib_net_to_host_u16 (fip->payload_length), @@ -760,8 +783,8 @@ ip6_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node, if (~0 != reass->last_packet_octet && reass->data_len == reass->last_packet_octet + 1) { - ip6_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0, - vec_drop_compress, is_feature); + return ip6_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0, + vec_drop_compress, is_feature); } else { @@ -776,6 +799,7 @@ ip6_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node, *error0 = IP6_ERROR_REASS_DUPLICATE_FRAGMENT; } } + return IP6_REASS_RC_OK; } always_inline bool @@ -860,9 +884,11 @@ ip6_reassembly_inline (vlib_main_t * vm, next_index = node->cached_next_index; static u32 *vec_timeout = NULL; // indexes of buffers which timed out static u32 *vec_drop_overlap = NULL; // indexes of buffers dropped due to overlap + static u32 *vec_drop_internal_error = NULL; // indexes of buffers dropped due to internal errors static u32 *vec_drop_compress = NULL; // indexes of buffers dropped due to buffer compression - while (n_left_from > 0 || vec_len (vec_timeout) > 0 || - vec_len (vec_drop_overlap) > 0 || vec_len (vec_drop_compress) > 0) + while (n_left_from > 0 || vec_len (vec_timeout) > 0 + || vec_len (vec_drop_overlap) > 0 || vec_len (vec_drop_compress) > 0 + || vec_len (vec_drop_internal_error) > 0) { vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); @@ -877,7 +903,6 @@ ip6_reassembly_inline (vlib_main_t * vm, vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, n_left_to_next, bi, IP6_REASSEMBLY_NEXT_DROP); - ASSERT (rt->buffers_n > 0); --rt->buffers_n; } @@ -892,7 +917,6 @@ ip6_reassembly_inline (vlib_main_t * vm, vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, n_left_to_next, bi, IP6_REASSEMBLY_NEXT_DROP); - ASSERT (rt->buffers_n > 0); --rt->buffers_n; } @@ -907,7 +931,19 @@ ip6_reassembly_inline (vlib_main_t * vm, vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, n_left_to_next, bi, IP6_REASSEMBLY_NEXT_DROP); - ASSERT (rt->buffers_n > 0); + --rt->buffers_n; + } + while (vec_len (vec_drop_internal_error) > 0 && n_left_to_next > 0) + { + u32 bi = vec_pop (vec_drop_internal_error); + vlib_buffer_t *b = vlib_get_buffer (vm, bi); + b->error = node->errors[IP6_ERROR_REASS_INTERNAL_ERROR]; + to_next[0] = bi; + to_next += 1; + n_left_to_next -= 1; + vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, + n_left_to_next, bi, + IP6_REASSEMBLY_NEXT_DROP); --rt->buffers_n; } @@ -970,9 +1006,21 @@ ip6_reassembly_inline (vlib_main_t * vm, if (reass) { - ip6_reass_update (vm, node, rm, rt, reass, &bi0, &next0, - &error0, frag_hdr, &vec_drop_overlap, - &vec_drop_compress, is_feature); + switch (ip6_reass_update (vm, node, rm, rt, reass, &bi0, &next0, + &error0, frag_hdr, &vec_drop_overlap, + &vec_drop_compress, is_feature)) + { + case IP6_REASS_RC_OK: + /* nothing to do here */ + break; + case IP6_REASS_RC_INTERNAL_ERROR: + /* drop everything and start with a clean slate */ + ip6_reass_drop_all (vm, rm, reass, + &vec_drop_internal_error); + ip6_reass_free (rm, rt, reass); + goto next_packet; + break; + } } else { @@ -1007,6 +1055,7 @@ ip6_reassembly_inline (vlib_main_t * vm, n_left_to_next, icmp_bi, next0); } + next_packet: from += 1; n_left_from -= 1; } @@ -1298,12 +1347,10 @@ ip6_reass_walk_expired (vlib_main_t * vm, } ip6_reass_on_timeout (vm, node, rm, reass, &icmp_bi, &vec_timeout); u32 after = vec_len (vec_timeout); - ASSERT (rt->buffers_n >= (after - before)); rt->buffers_n -= (after - before); if (~0 != icmp_bi) { vec_add1 (vec_icmp_bi, icmp_bi); - ASSERT (rt->buffers_n > 0); --rt->buffers_n; } ip6_reass_free (rm, rt, reass); @@ -1438,8 +1485,8 @@ format_ip6_reass (u8 * s, va_list * args) "fragment[%u, %u]\n", counter, vnb->ip.reass.range_first, vnb->ip.reass.range_last, bi, - ip6_reass_buffer_get_data_offset_no_check (b), - ip6_reass_buffer_get_data_len_no_check (b), + ip6_reass_buffer_get_data_offset (b), + ip6_reass_buffer_get_data_len (b), vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last); if (b->flags & VLIB_BUFFER_NEXT_PRESENT) { |