diff options
Diffstat (limited to 'src/vnet/ip/icmp4.c')
| -rw-r--r-- | src/vnet/ip/icmp4.c | 30 |
1 files changed, 29 insertions, 1 deletions
diff --git a/src/vnet/ip/icmp4.c b/src/vnet/ip/icmp4.c index 5f9ffa3b2b7..857c3b1d2a5 100644 --- a/src/vnet/ip/icmp4.c +++ b/src/vnet/ip/icmp4.c @@ -41,6 +41,7 @@ #include <vnet/ip/ip.h> #include <vnet/pg/pg.h> #include <vnet/ip/ip_sas.h> +#include <vnet/util/throttle.h> static char *icmp_error_strings[] = { #define _(f,s) s, @@ -48,6 +49,9 @@ static char *icmp_error_strings[] = { #undef _ }; +/** ICMP throttling */ +static throttle_t icmp_throttle; + static u8 * format_ip4_icmp_type_and_code (u8 * s, va_list * args) { @@ -255,11 +259,14 @@ ip4_icmp_error (vlib_main_t * vm, u32 *from, *to_next; uword n_left_from, n_left_to_next; ip4_icmp_error_next_t next_index; + u32 thread_index = vm->thread_index; from = vlib_frame_vector_args (frame); n_left_from = frame->n_vectors; next_index = node->cached_next_index; + u64 seed = throttle_seed (&icmp_throttle, thread_index, vlib_time_now (vm)); + if (node->flags & VLIB_NODE_FLAG_TRACE) vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors, /* stride */ 1, @@ -289,6 +296,21 @@ ip4_icmp_error (vlib_main_t * vm, ip_csum_t sum; org_p0 = vlib_get_buffer (vm, org_pi0); + ip0 = vlib_buffer_get_current (org_p0); + + /* Rate limit based on the src,dst addresses in the original packet + */ + u64 r0 = + (u64) ip0->dst_address.as_u32 << 32 | ip0->src_address.as_u32; + + if (throttle_check (&icmp_throttle, thread_index, r0, seed)) + { + vlib_error_count (vm, node->node_index, ICMP4_ERROR_DROP, 1); + from += 1; + n_left_from -= 1; + continue; + } + p0 = vlib_buffer_copy_no_chain (vm, org_p0, &pi0); if (!p0 || pi0 == ~0) /* Out of buffers */ continue; @@ -300,9 +322,10 @@ ip4_icmp_error (vlib_main_t * vm, n_left_from -= 1; n_left_to_next -= 1; - ip0 = vlib_buffer_get_current (p0); sw_if_index0 = vnet_buffer (p0)->sw_if_index[VLIB_RX]; + vlib_buffer_copy_trace_flag (vm, p0, pi0); + /* Add IP header and ICMPv4 header including a 4 byte data field */ vlib_buffer_advance (p0, -sizeof (ip4_header_t) - @@ -570,6 +593,11 @@ icmp4_init (vlib_main_t * vm) ICMP_INPUT_NEXT_ERROR, sizeof (cm->ip4_input_next_index_by_type)); + vlib_thread_main_t *tm = &vlib_thread_main; + u32 n_vlib_mains = tm->n_vlib_mains; + + throttle_init (&icmp_throttle, n_vlib_mains, 1e-3); + return 0; } |