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Ensures that msg_controllen includes last padding.

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Although RFC 3542 allows both cases, Theo de Raadt thinks
he knows better, and msg_controllen without last padding
fails on OpenBSD.

Thanks to Job Snijders for the bugreport.
This commit is contained in:
Ondrej Zajicek
2014-06-26 13:30:27 +02:00
parent 9d5960cfa5
commit 8945f73d94
3 changed files with 9 additions and 3 deletions
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4
sysdep/unix/io.c
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@@ -705,6 +705,7 @@ sk_prepare_cmsgs6(sock *s, struct msghdr *msg, void *cbuf, size_t cbuflen)
{
struct cmsghdr *cm;
struct in6_pktinfo *pi;
int controllen = 0;
msg->msg_control = cbuf;
msg->msg_controllen = cbuflen;
@@ -713,12 +714,13 @@ sk_prepare_cmsgs6(sock *s, struct msghdr *msg, void *cbuf, size_t cbuflen)
cm->cmsg_level = SOL_IPV6;
cm->cmsg_type = IPV6_PKTINFO;
cm->cmsg_len = CMSG_LEN(sizeof(*pi));
controllen += CMSG_SPACE(sizeof(*pi));
pi = (struct in6_pktinfo *) CMSG_DATA(cm);
pi->ipi6_ifindex = s->iface ? s->iface->index : 0;
pi->ipi6_addr = ipa_to_in6(s->saddr);
msg->msg_controllen = cm->cmsg_len;
msg->msg_controllen = controllen;
}