diff options
| author |   Matus Fabian <matfabia@cisco.com> | 2017-06-15 02:28:50 -0700 |
|---|---|---|
| committer |   Ole Trøan <otroan@employees.org> | 2017-06-19 11:08:47 +0000 |
| commit | 029f3d2c1c6b04a6cfef17242cb36b304025fe23 (patch) | |
| tree | 5036e25543b5d43deeb15fde31135a3531d864ce /src/plugins/snat/nat64_out2in.c | |
| parent | acd4c63e3c6e70ea3f58527d9bace7c0e38df719 (diff) | |
NAT64: Hairpinning (VPP-699)
Change-Id: I83a6c277fa211ac2c2ca2d603650c992886af0a7
Signed-off-by: Matus Fabian <matfabia@cisco.com>
Diffstat (limited to 'src/plugins/snat/nat64_out2in.c')
| -rw-r--r-- | src/plugins/snat/nat64_out2in.c | 35 |
1 files changed, 34 insertions, 1 deletions
diff --git a/src/plugins/snat/nat64_out2in.c b/src/plugins/snat/nat64_out2in.c index c11bbb5a7b1..0a5fbe5b357 100644 --- a/src/plugins/snat/nat64_out2in.c +++ b/src/plugins/snat/nat64_out2in.c @@ -27,8 +27,9 @@ static u8 well_known_prefix[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 - }; +}; /* *INDENT-ON* */ + typedef struct { u32 sw_if_index; @@ -95,10 +96,13 @@ nat64_out2in_tcp_udp_set_cb (ip4_header_t * ip4, ip6_header_t * ip6, ip46_address_t saddr, daddr; ip6_address_t ip6_saddr; udp_header_t *udp = ip4_next_header (ip4); + tcp_header_t *tcp = ip4_next_header (ip4); snat_protocol_t proto = ip_proto_to_snat_proto (ip4->protocol); u16 dport = udp->dst_port; u16 sport = udp->src_port; u32 sw_if_index, fib_index; + u16 *checksum; + ip_csum_t csum; sw_if_index = vnet_buffer (ctx->b)->sw_if_index[VLIB_RX]; fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index); @@ -142,6 +146,16 @@ nat64_out2in_tcp_udp_set_cb (ip4_header_t * ip4, ip6_header_t * ip6, ip6->dst_address.as_u64[1] = bibe->in_addr.as_u64[1]; udp->dst_port = bibe->in_port; + if (proto == SNAT_PROTOCOL_UDP) + checksum = &udp->checksum; + else + checksum = &tcp->checksum; + csum = ip_csum_sub_even (*checksum, dport); + csum = ip_csum_add_even (csum, udp->dst_port); + *checksum = ip_csum_fold (csum); + + vnet_buffer (ctx->b)->sw_if_index[VLIB_TX] = bibe->fib_index; + return 0; } @@ -205,6 +219,7 @@ nat64_out2in_icmp_set_cb (ip4_header_t * ip4, ip6_header_t * ip6, void *arg) ip6->dst_address.as_u64[1] = bibe->in_addr.as_u64[1]; ((u16 *) (icmp))[2] = bibe->in_port; + vnet_buffer (ctx->b)->sw_if_index[VLIB_TX] = bibe->fib_index; } else { @@ -269,12 +284,17 @@ nat64_out2in_inner_icmp_set_cb (ip4_header_t * ip4, ip6_header_t * ip6, ip6->src_address.as_u64[0] = bibe->in_addr.as_u64[0]; ip6->src_address.as_u64[1] = bibe->in_addr.as_u64[1]; ((u16 *) (icmp))[2] = bibe->in_port; + + vnet_buffer (ctx->b)->sw_if_index[VLIB_TX] = bibe->fib_index; } else { udp_header_t *udp = ip4_next_header (ip4); + tcp_header_t *tcp = ip4_next_header (ip4); u16 dport = udp->dst_port; u16 sport = udp->src_port; + u16 *checksum; + ip_csum_t csum; ste = nat64_db_st_entry_find (&nm->db, &saddr, &daddr, sport, dport, proto, @@ -291,6 +311,19 @@ nat64_out2in_inner_icmp_set_cb (ip4_header_t * ip4, ip6_header_t * ip6, ip6->src_address.as_u64[0] = bibe->in_addr.as_u64[0]; ip6->src_address.as_u64[1] = bibe->in_addr.as_u64[1]; udp->src_port = bibe->in_port; + + if (proto == SNAT_PROTOCOL_UDP) + checksum = &udp->checksum; + else + checksum = &tcp->checksum; + if (*checksum) + { + csum = ip_csum_sub_even (*checksum, sport); + csum = ip_csum_add_even (csum, udp->src_port); + *checksum = ip_csum_fold (csum); + } + + vnet_buffer (ctx->b)->sw_if_index[VLIB_TX] = bibe->fib_index; } return 0; |