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Merge pull request #4147 from marcfiu/issue-4026

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fix for issue #4026: set broadcast to 0.0.0.0 for /31 and /32
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Christian Brauner 2022-07-01 10:16:17 +02:00 committed by GitHub
commit 85a273b596
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1 changed files with 12 additions and 6 deletions
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18
src/lxc/confile.c
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@ -899,13 +899,19 @@ static int set_config_net_ipv4_address(const char *key, const char *value,
/* If no broadcast address, compute one from the prefix and address. */
if (!bcast) {
unsigned int shift = LAST_BIT_PER_TYPE(inetdev->prefix);
/* 0<=inetdev->prefix<=32 */
switch (inetdev->prefix) {
case 32: /* single IPv4 network */
; /* fall thru */
case 31: /* RFC 3021 point to point network */
inetdev->bcast.s_addr = INADDR_ANY;
break;
inetdev->bcast.s_addr = inetdev->addr.s_addr;
if (inetdev->prefix < shift)
shift = inetdev->prefix;
inetdev->bcast.s_addr |= htonl(INADDR_BROADCAST >> shift);
}
default:
inetdev->bcast.s_addr |= htonl(INADDR_BROADCAST >> inetdev->prefix);
break;
}
}
list_add_tail(&inetdev->head, &netdev->ipv4_addresses);
move_ptr(inetdev);