diff options
Diffstat (limited to 'networking')
| -rw-r--r-- | networking/zcip.c | 38 |
1 files changed, 22 insertions, 16 deletions
diff --git a/networking/zcip.c b/networking/zcip.c index 7314ff8..45d1f7c 100644 --- a/networking/zcip.c +++ b/networking/zcip.c @@ -366,11 +366,11 @@ int zcip_main(int argc UNUSED_PARAM, char **argv) nprobes++; VDBG("probe/%u %s@%s\n", nprobes, argv_intf, inet_ntoa(ip)); + timeout_ms = PROBE_MIN * 1000; + timeout_ms += random_delay_ms(PROBE_MAX - PROBE_MIN); arp(/* ARPOP_REQUEST, */ /* ð_addr, */ null_ip, &null_addr, ip); - timeout_ms = PROBE_MIN * 1000; - timeout_ms += random_delay_ms(PROBE_MAX - PROBE_MIN); } else { // Switch to announce state. @@ -378,10 +378,10 @@ int zcip_main(int argc UNUSED_PARAM, char **argv) nclaims = 0; VDBG("announce/%u %s@%s\n", nclaims, argv_intf, inet_ntoa(ip)); + timeout_ms = ANNOUNCE_INTERVAL * 1000; arp(/* ARPOP_REQUEST, */ /* ð_addr, */ ip, ð_addr, ip); - timeout_ms = ANNOUNCE_INTERVAL * 1000; } break; case RATE_LIMIT_PROBE: @@ -391,10 +391,10 @@ int zcip_main(int argc UNUSED_PARAM, char **argv) nclaims = 0; VDBG("announce/%u %s@%s\n", nclaims, argv_intf, inet_ntoa(ip)); + timeout_ms = ANNOUNCE_INTERVAL * 1000; arp(/* ARPOP_REQUEST, */ /* ð_addr, */ ip, ð_addr, ip); - timeout_ms = ANNOUNCE_INTERVAL * 1000; break; case ANNOUNCE: // timeouts in the ANNOUNCE state mean no conflicting ARP packets @@ -403,10 +403,10 @@ int zcip_main(int argc UNUSED_PARAM, char **argv) nclaims++; VDBG("announce/%u %s@%s\n", nclaims, argv_intf, inet_ntoa(ip)); + timeout_ms = ANNOUNCE_INTERVAL * 1000; arp(/* ARPOP_REQUEST, */ /* ð_addr, */ ip, ð_addr, ip); - timeout_ms = ANNOUNCE_INTERVAL * 1000; } else { // Switch to monitor state. @@ -495,22 +495,28 @@ int zcip_main(int argc UNUSED_PARAM, char **argv) } #endif if (p.arp.arp_op != htons(ARPOP_REQUEST) - && p.arp.arp_op != htons(ARPOP_REPLY)) + && p.arp.arp_op != htons(ARPOP_REPLY) + ) { continue; + } source_ip_conflict = 0; target_ip_conflict = 0; - if (memcmp(p.arp.arp_spa, &ip.s_addr, sizeof(struct in_addr)) == 0 - && memcmp(&p.arp.arp_sha, ð_addr, ETH_ALEN) != 0 - ) { - source_ip_conflict = 1; - } - if (p.arp.arp_op == htons(ARPOP_REQUEST) - && memcmp(p.arp.arp_tpa, &ip.s_addr, sizeof(struct in_addr)) == 0 - && memcmp(&p.arp.arp_tha, ð_addr, ETH_ALEN) != 0 - ) { - target_ip_conflict = 1; + if (memcmp(&p.arp.arp_sha, ð_addr, ETH_ALEN) != 0) { + if (memcmp(p.arp.arp_spa, &ip.s_addr, sizeof(struct in_addr))) { + /* A probe or reply with source_ip == chosen ip */ + source_ip_conflict = 1; + } + if (p.arp.arp_op == htons(ARPOP_REQUEST) + && memcmp(p.arp.arp_spa, &null_ip, sizeof(struct in_addr)) == 0 + && memcmp(p.arp.arp_tpa, &ip.s_addr, sizeof(struct in_addr)) == 0 + ) { + /* A probe with source_ip == 0.0.0.0, target_ip == chosen ip: + * another host trying to claim this ip! + */ + target_ip_conflict = 1; + } } VDBG("state = %d, source ip conflict = %d, target ip conflict = %d\n", |