diff options
Diffstat (limited to 'src/vnet/ip/ip4_to_ip6.h')
| -rw-r--r-- | src/vnet/ip/ip4_to_ip6.h | 55 |
1 files changed, 37 insertions, 18 deletions
diff --git a/src/vnet/ip/ip4_to_ip6.h b/src/vnet/ip/ip4_to_ip6.h index dad35230..cdd37072 100644 --- a/src/vnet/ip/ip4_to_ip6.h +++ b/src/vnet/ip/ip4_to_ip6.h @@ -321,17 +321,9 @@ icmp_to_icmp6 (vlib_buffer_t * p, ip4_to_ip6_set_fn_t fn, void *ctx, //We have an ICMP inside an ICMP //It needs to be translated, but not for error ICMP messages icmp46_header_t *inner_icmp = (icmp46_header_t *) (inner_ip4 + 1); - csum = inner_icmp->checksum; //Only types ICMP4_echo_request and ICMP4_echo_reply are handled by icmp_to_icmp6_header - csum = ip_csum_sub_even (csum, *((u16 *) inner_icmp)); inner_icmp->type = (inner_icmp->type == ICMP4_echo_request) ? ICMP6_echo_request : ICMP6_echo_reply; - csum = ip_csum_add_even (csum, *((u16 *) inner_icmp)); - csum = - ip_csum_add_even (csum, clib_host_to_net_u16 (IP_PROTOCOL_ICMP6)); - csum = - ip_csum_add_even (csum, inner_ip4->length - sizeof (*inner_ip4)); - inner_icmp->checksum = ip_csum_fold (csum); inner_L4_checksum = &inner_icmp->checksum; inner_ip4->protocol = IP_PROTOCOL_ICMP6; } @@ -341,8 +333,6 @@ icmp_to_icmp6 (vlib_buffer_t * p, ip4_to_ip6_set_fn_t fn, void *ctx, os_panic (); } - csum = *inner_L4_checksum; //Initial checksum of the inner L4 header - inner_ip6->ip_version_traffic_class_and_flow_label = clib_host_to_net_u32 ((6 << 28) + (inner_ip4->tos << 20)); inner_ip6->payload_length = @@ -367,14 +357,42 @@ icmp_to_icmp6 (vlib_buffer_t * p, ip4_to_ip6_set_fn_t fn, void *ctx, sizeof (*inner_frag)); } - /* UDP checksum is optional */ - if (csum) + csum = *inner_L4_checksum; + if (inner_ip6->protocol == IP_PROTOCOL_ICMP6) { - csum = ip_csum_add_even (csum, inner_ip6->src_address.as_u64[0]); - csum = ip_csum_add_even (csum, inner_ip6->src_address.as_u64[1]); - csum = ip_csum_add_even (csum, inner_ip6->dst_address.as_u64[0]); - csum = ip_csum_add_even (csum, inner_ip6->dst_address.as_u64[1]); - *inner_L4_checksum = ip_csum_fold (csum); + //Recompute ICMP checksum + icmp46_header_t *inner_icmp = (icmp46_header_t *) (inner_ip4 + 1); + + inner_icmp->checksum = 0; + csum = ip_csum_with_carry (0, inner_ip6->payload_length); + csum = + ip_csum_with_carry (csum, + clib_host_to_net_u16 (inner_ip6->protocol)); + csum = ip_csum_with_carry (csum, inner_ip6->src_address.as_u64[0]); + csum = ip_csum_with_carry (csum, inner_ip6->src_address.as_u64[1]); + csum = ip_csum_with_carry (csum, inner_ip6->dst_address.as_u64[0]); + csum = ip_csum_with_carry (csum, inner_ip6->dst_address.as_u64[1]); + csum = + ip_incremental_checksum (csum, inner_icmp, + clib_net_to_host_u16 + (inner_ip6->payload_length)); + inner_icmp->checksum = ~ip_csum_fold (csum); + } + else + { + /* UDP checksum is optional */ + if (csum) + { + csum = + ip_csum_add_even (csum, inner_ip6->src_address.as_u64[0]); + csum = + ip_csum_add_even (csum, inner_ip6->src_address.as_u64[1]); + csum = + ip_csum_add_even (csum, inner_ip6->dst_address.as_u64[0]); + csum = + ip_csum_add_even (csum, inner_ip6->dst_address.as_u64[1]); + *inner_L4_checksum = ip_csum_fold (csum); + } } } else @@ -518,6 +536,7 @@ ip4_to_ip6_tcp_udp (vlib_buffer_t * p, ip4_to_ip6_set_fn_t fn, void *ctx) csum = ip_csum_sub_even (*checksum, ip4->src_address.as_u32); csum = ip_csum_sub_even (csum, ip4->dst_address.as_u32); + *checksum = ip_csum_fold (csum); // Deal with fragmented packets if (PREDICT_FALSE (ip4->flags_and_fragment_offset & @@ -558,7 +577,7 @@ ip4_to_ip6_tcp_udp (vlib_buffer_t * p, ip4_to_ip6_set_fn_t fn, void *ctx) if ((rv = fn (ip4, ip6, ctx)) != 0) return rv; - csum = ip_csum_add_even (csum, ip6->src_address.as_u64[0]); + csum = ip_csum_add_even (*checksum, ip6->src_address.as_u64[0]); csum = ip_csum_add_even (csum, ip6->src_address.as_u64[1]); csum = ip_csum_add_even (csum, ip6->dst_address.as_u64[0]); csum = ip_csum_add_even (csum, ip6->dst_address.as_u64[1]); |