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slirp: Forward ICMP echo requests via unprivileged sockets

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Linux 3.0 gained support for unprivileged ICMP ping sockets. Use this
feature to forward guest pings to the outer world. The host admin has to
set the ping_group_range in order to grant access to those sockets. To
allow ping for the users group (GID 100):

echo 100 100 > /proc/sys/net/ipv4/ping_group_range

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Jan Kiszka 2011-07-20 12:20:18 +02:00 • committed by Anthony Liguori
parent 565465fcae
commit e6d43cfb1f
7 changed files with 147 additions and 1 deletions
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2
slirp/socket.c
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@ -71,6 +71,8 @@ sofree(struct socket *so)
slirp->tcp_last_so = &slirp->tcb;
} else if (so == slirp->udp_last_so) {
slirp->udp_last_so = &slirp->udb;
} else if (so == slirp->icmp_last_so) {
slirp->icmp_last_so = &slirp->icmp;
}
m_free(so->so_m);