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Make arp swapping more readable, --BUG

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This commit is contained in:
Nico Schottelius 2019-04-02 17:42:56 +02:00
parent ec55663cfc
commit fbe8e66431
1 changed files with 14 additions and 7 deletions
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21
p4src/static-mapping.p4
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@ -334,18 +334,25 @@ Echo or Echo Reply Message
/********************** ARP ***********************************/ /********************** ARP ***********************************/
action arp_reply(mac_addr_t mac_addr) { action arp_reply(mac_addr_t mac_addr) {
ipv4_addr_t tmp = hdr.arp.src_ipv4_addr; /* swap */
ipv4_addr_t ipv4_src = hdr.arp.dst_ipv4_addr;
ipv4_addr_t ipv4_dst = hdr.arp.src_ipv4_addr;
/* swap/add */
mac_addr_t mac_src = mac_addr;
mac_addr_t mac_dst = hdr.arp.src_mac_addr;
/* fill the ethernet header */ /* fill the ethernet header */
hdr.ethernet.src_addr = mac_addr; hdr.ethernet.dst_addr = mac_dst;
hdr.ethernet.dst_addr = hdr.arp.src_mac_addr; hdr.ethernet.src_addr = mac_src;
/* fill the arp header */ /* fill the arp header */
hdr.arp.dst_mac_addr = hdr.arp.src_mac_addr; hdr.arp.dst_mac_addr = mac_dst;
hdr.arp.dst_ipv4_addr = tmp; hdr.arp.src_mac_addr = mac_src;
hdr.arp.src_mac_addr = mac_addr; /* swapping */
hdr.arp.src_ipv4_addr = hdr.arp.dst_ipv4_addr; hdr.arp.dst_ipv4_addr = ipv4_src;
hdr.arp.src_ipv4_addr = ipv4_dst;
hdr.arp.opcode = ARP_REPLY; hdr.arp.opcode = ARP_REPLY;
} }