/* * Copyright (c) 2019 Cisco and/or its affiliates. * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #ifndef included_gso_h #define included_gso_h #include <vnet/ethernet/ethernet.h> #include <vnet/ip/ip4_packet.h> #include <vnet/ip/ip6_packet.h> #include <vnet/udp/udp_packet.h> #include <vnet/vnet.h> typedef struct { i16 l2_hdr_offset; i16 l3_hdr_offset; i16 l4_hdr_offset; u16 l4_hdr_sz; i16 outer_l2_hdr_offset; i16 outer_l3_hdr_offset; i16 outer_l4_hdr_offset; } gso_header_offset_t; typedef struct { vlib_main_t *vlib_main; vnet_main_t *vnet_main; u16 msg_id_base; } gso_main_t; extern gso_main_t gso_main; int vnet_sw_interface_gso_enable_disable (u32 sw_if_index, u8 enable); static_always_inline gso_header_offset_t vnet_gso_header_offset_parser (vlib_buffer_t * b0, int is_ip6) { gso_header_offset_t gho = { 0 }; u8 l4_proto = 0; u8 l4_hdr_sz = 0; if (PREDICT_TRUE ((b0->flags & (VNET_BUFFER_F_L2_HDR_OFFSET_VALID | VNET_BUFFER_F_L3_HDR_OFFSET_VALID | VNET_BUFFER_F_L4_HDR_OFFSET_VALID)) == (VNET_BUFFER_F_L2_HDR_OFFSET_VALID | VNET_BUFFER_F_L3_HDR_OFFSET_VALID | VNET_BUFFER_F_L4_HDR_OFFSET_VALID))) { gho.l2_hdr_offset = vnet_buffer (b0)->l2_hdr_offset; gho.l3_hdr_offset = vnet_buffer (b0)->l3_hdr_offset; gho.l4_hdr_offset = vnet_buffer (b0)->l4_hdr_offset; gho.l4_hdr_sz = vnet_buffer2 (b0)->gso_l4_hdr_sz; return gho; } ethernet_header_t *eh = (ethernet_header_t *) vlib_buffer_get_current (b0); u16 ethertype = clib_net_to_host_u16 (eh->type); u16 l2hdr_sz = sizeof (ethernet_header_t); if (ethernet_frame_is_tagged (ethertype)) { ethernet_vlan_header_t *vlan = (ethernet_vlan_header_t *) (eh + 1); ethertype = clib_net_to_host_u16 (vlan->type); l2hdr_sz += sizeof (*vlan); if (ethertype == ETHERNET_TYPE_VLAN) { vlan++; ethertype = clib_net_to_host_u16 (vlan->type); l2hdr_sz += sizeof (*vlan); } } gho.l2_hdr_offset = b0->current_data; gho.l3_hdr_offset = l2hdr_sz; if (PREDICT_TRUE (is_ip6 == 0)) { ip4_header_t *ip4 = (ip4_header_t *) (vlib_buffer_get_current (b0) + l2hdr_sz); gho.l4_hdr_offset = l2hdr_sz + ip4_header_bytes (ip4); l4_proto = ip4->protocol; } else if (PREDICT_TRUE (is_ip6)) { ip6_header_t *ip6 = (ip6_header_t *) (vlib_buffer_get_current (b0) + l2hdr_sz); /* FIXME IPv6 EH traversal */ gho.l4_hdr_offset = l2hdr_sz + sizeof (ip6_header_t); l4_proto = ip6->protocol; } if (l4_proto == IP_PROTOCOL_TCP) { tcp_header_t *tcp = (tcp_header_t *) (vlib_buffer_get_current (b0) + gho.l4_hdr_offset); l4_hdr_sz = tcp_header_bytes (tcp); tcp->checksum = 0; } else if (l4_proto == IP_PROTOCOL_UDP) { udp_header_t *udp = (udp_header_t *) (vlib_buffer_get_current (b0) + gho.l4_hdr_offset); l4_hdr_sz = sizeof (*udp); udp->checksum = 0; } if (b0->flags & (VNET_BUFFER_F_IS_IP4 | VNET_BUFFER_F_IS_IP6)) { gho.l4_hdr_sz = l4_hdr_sz; } return gho; } #endif /* included_gso_h */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */