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arp: Don't answer announcements from guest or namespace
Depending on the configuration, the host might have the same address. Don't answer them to avoid a duplicate IP address detection. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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parent
1e49d194d0
commit
2166c5872e
6
arp.c
6
arp.c
@ -57,6 +57,12 @@ int arp(struct ctx *c, struct ethhdr *eh, size_t len)
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ah->ar_op != htons(ARPOP_REQUEST))
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return 1;
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/* Discard announcements (but not 0.0.0.0 "probes"): we might have the
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* same IP address, hide that.
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*/
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if (*((uint32_t *)&am->sip) && !memcmp(am->sip, am->tip, 4))
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return 1;
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ah->ar_op = htons(ARPOP_REPLY);
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memcpy(am->tha, am->sha, ETH_ALEN);
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memcpy(am->sha, c->mac, ETH_ALEN);
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