diff options
Diffstat (limited to 'VNFs/DPPD-PROX/arp.h')
| -rw-r--r-- | VNFs/DPPD-PROX/arp.h | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/VNFs/DPPD-PROX/arp.h b/VNFs/DPPD-PROX/arp.h new file mode 100644 index 00000000..279bdada --- /dev/null +++ b/VNFs/DPPD-PROX/arp.h @@ -0,0 +1,72 @@ +/* +// Copyright (c) 2010-2017 Intel Corporation +// +// 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 _ARP_H_ +#define _ARP_H_ + +#include <rte_ether.h> + +#define ARP_REQUEST 0x100 +#define ARP_REPLY 0x200 + +struct _arp_ipv4 { + struct ether_addr sha; /* Sender hardware address */ + uint32_t spa; /* Sender protocol address */ + struct ether_addr tha; /* Target hardware address */ + uint32_t tpa; /* Target protocol address */ +} __attribute__((__packed__)); +typedef struct _arp_ipv4 arp_ipv4_t; + +struct my_arp_t { + uint16_t htype; + uint16_t ptype; + uint8_t hlen; + uint8_t plen; + uint16_t oper; + arp_ipv4_t data; +} __attribute__((__packed__)); + +struct ether_hdr_arp { + struct ether_hdr ether_hdr; + struct my_arp_t arp; +}; + +static int arp_is_gratuitous(struct ether_hdr_arp *hdr) +{ + return hdr->arp.data.spa == hdr->arp.data.tpa; +} + +static inline void prepare_arp_reply(struct ether_hdr_arp *hdr_arp, struct ether_addr *s_addr) +{ + uint32_t ip_source = hdr_arp->arp.data.spa; + + hdr_arp->arp.data.spa = hdr_arp->arp.data.tpa; + hdr_arp->arp.data.tpa = ip_source; + hdr_arp->arp.oper = 0x200; + memcpy(&hdr_arp->arp.data.tha, &hdr_arp->arp.data.sha, sizeof(struct ether_addr)); + memcpy(&hdr_arp->arp.data.sha, s_addr, sizeof(struct ether_addr)); +} + +static void create_mac(struct ether_hdr_arp *hdr, struct ether_addr *addr) +{ + addr->addr_bytes[0] = 0x2; + addr->addr_bytes[1] = 0; + // Instead of sending a completely random MAC address, create the following MAC: + // 02:00:x1:x2:x3:x4 where x1:x2:x3:x4 is the IP address + memcpy(addr->addr_bytes + 2, (uint32_t *)&hdr->arp.data.tpa, 4); +} + +#endif /* _ARP_H_ */ |