diff options
| author | Krister Johansen <kjlx@templeofstupid.com> | 2017-01-20 17:49:11 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-01-24 12:10:51 -0500 |
| commit | 4548b683b78137f8eadeb312b94e20bb0d4a7141 (patch) | |
| tree | 8b285d141f533807625336c4524411bf31d48d9f /net/netfilter | |
| parent | d140199af510ad4749dc5e38b7922135258ba5fd (diff) | |
Introduce a sysctl that modifies the value of PROT_SOCK.
Add net.ipv4.ip_unprivileged_port_start, which is a per namespace sysctl
that denotes the first unprivileged inet port in the namespace. To
disable all privileged ports set this to zero. It also checks for
overlap with the local port range. The privileged and local range may
not overlap.
The use case for this change is to allow containerized processes to bind
to priviliged ports, but prevent them from ever being allowed to modify
their container's network configuration. The latter is accomplished by
ensuring that the network namespace is not a child of the user
namespace. This modification was needed to allow the container manager
to disable a namespace's priviliged port restrictions without exposing
control of the network namespace to processes in the user namespace.
Signed-off-by: Krister Johansen <kjlx@templeofstupid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/netfilter')
| -rw-r--r-- | net/netfilter/ipvs/ip_vs_ctl.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c index 55e0169caa4c..8b7416f4e01a 100644 --- a/net/netfilter/ipvs/ip_vs_ctl.c +++ b/net/netfilter/ipvs/ip_vs_ctl.c @@ -426,10 +426,9 @@ ip_vs_service_find(struct netns_ipvs *ipvs, int af, __u32 fwmark, __u16 protocol */ svc = __ip_vs_service_find(ipvs, af, protocol, vaddr, vport); - if (svc == NULL - && protocol == IPPROTO_TCP - && atomic_read(&ipvs->ftpsvc_counter) - && (vport == FTPDATA || ntohs(vport) >= PROT_SOCK)) { + if (!svc && protocol == IPPROTO_TCP && + atomic_read(&ipvs->ftpsvc_counter) && + (vport == FTPDATA || ntohs(vport) >= inet_prot_sock(ipvs->net))) { /* * Check if ftp service entry exists, the packet * might belong to FTP data connections. |