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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/linux/sysio.h
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@@ -154,6 +154,7 @@ sk_prepare_cmsgs4(sock *s, struct msghdr *msg, void *cbuf, size_t cbuflen)
{
struct cmsghdr *cm;
struct in_pktinfo *pi;
int controllen = 0;
msg->msg_control = cbuf;
msg->msg_controllen = cbuflen;
@@ -162,13 +163,14 @@ sk_prepare_cmsgs4(sock *s, struct msghdr *msg, void *cbuf, size_t cbuflen)
cm->cmsg_level = SOL_IP;
cm->cmsg_type = IP_PKTINFO;
cm->cmsg_len = CMSG_LEN(sizeof(*pi));
controllen += CMSG_SPACE(sizeof(*pi));
pi = (struct in_pktinfo *) CMSG_DATA(cm);
pi->ipi_ifindex = s->iface ? s->iface->index : 0;
pi->ipi_spec_dst = ipa_to_in4(s->saddr);
pi->ipi_addr = ipa_to_in4(IPA_NONE);
msg->msg_controllen = cm->cmsg_len;
msg->msg_controllen = controllen;
}