2005-04-17 06:20:36 +08:00
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/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* The IP to API glue.
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2007-02-09 22:24:47 +08:00
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*
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2005-04-17 06:20:36 +08:00
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* Authors: see ip.c
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*
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* Fixes:
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* Many : Split from ip.c , see ip.c for history.
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* Martin Mares : TOS setting fixed.
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2007-02-09 22:24:47 +08:00
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* Alan Cox : Fixed a couple of oopses in Martin's
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2005-04-17 06:20:36 +08:00
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* TOS tweaks.
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* Mike McLagan : Routing by source
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/mm.h>
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#include <linux/skbuff.h>
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#include <linux/ip.h>
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#include <linux/icmp.h>
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2005-12-27 12:43:12 +08:00
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#include <linux/inetdevice.h>
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2005-04-17 06:20:36 +08:00
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#include <linux/netdevice.h>
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#include <net/sock.h>
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#include <net/ip.h>
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#include <net/icmp.h>
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2005-12-14 15:26:10 +08:00
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#include <net/tcp_states.h>
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2005-04-17 06:20:36 +08:00
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#include <linux/udp.h>
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#include <linux/igmp.h>
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#include <linux/netfilter.h>
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#include <linux/route.h>
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#include <linux/mroute.h>
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#include <net/route.h>
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#include <net/xfrm.h>
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2008-04-27 16:06:07 +08:00
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#include <net/compat.h>
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2005-04-17 06:20:36 +08:00
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#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
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#include <net/transp_v6.h>
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#endif
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#include <linux/errqueue.h>
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#include <asm/uaccess.h>
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#define IP_CMSG_PKTINFO 1
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#define IP_CMSG_TTL 2
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#define IP_CMSG_TOS 4
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#define IP_CMSG_RECVOPTS 8
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#define IP_CMSG_RETOPTS 16
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[SECURITY]: TCP/UDP getpeersec
This patch implements an application of the LSM-IPSec networking
controls whereby an application can determine the label of the
security association its TCP or UDP sockets are currently connected to
via getsockopt and the auxiliary data mechanism of recvmsg.
Patch purpose:
This patch enables a security-aware application to retrieve the
security context of an IPSec security association a particular TCP or
UDP socket is using. The application can then use this security
context to determine the security context for processing on behalf of
the peer at the other end of this connection. In the case of UDP, the
security context is for each individual packet. An example
application is the inetd daemon, which could be modified to start
daemons running at security contexts dependent on the remote client.
Patch design approach:
- Design for TCP
The patch enables the SELinux LSM to set the peer security context for
a socket based on the security context of the IPSec security
association. The application may retrieve this context using
getsockopt. When called, the kernel determines if the socket is a
connected (TCP_ESTABLISHED) TCP socket and, if so, uses the dst_entry
cache on the socket to retrieve the security associations. If a
security association has a security context, the context string is
returned, as for UNIX domain sockets.
- Design for UDP
Unlike TCP, UDP is connectionless. This requires a somewhat different
API to retrieve the peer security context. With TCP, the peer
security context stays the same throughout the connection, thus it can
be retrieved at any time between when the connection is established
and when it is torn down. With UDP, each read/write can have
different peer and thus the security context might change every time.
As a result the security context retrieval must be done TOGETHER with
the packet retrieval.
The solution is to build upon the existing Unix domain socket API for
retrieving user credentials. Linux offers the API for obtaining user
credentials via ancillary messages (i.e., out of band/control messages
that are bundled together with a normal message).
Patch implementation details:
- Implementation for TCP
The security context can be retrieved by applications using getsockopt
with the existing SO_PEERSEC flag. As an example (ignoring error
checking):
getsockopt(sockfd, SOL_SOCKET, SO_PEERSEC, optbuf, &optlen);
printf("Socket peer context is: %s\n", optbuf);
The SELinux function, selinux_socket_getpeersec, is extended to check
for labeled security associations for connected (TCP_ESTABLISHED ==
sk->sk_state) TCP sockets only. If so, the socket has a dst_cache of
struct dst_entry values that may refer to security associations. If
these have security associations with security contexts, the security
context is returned.
getsockopt returns a buffer that contains a security context string or
the buffer is unmodified.
- Implementation for UDP
To retrieve the security context, the application first indicates to
the kernel such desire by setting the IP_PASSSEC option via
getsockopt. Then the application retrieves the security context using
the auxiliary data mechanism.
An example server application for UDP should look like this:
toggle = 1;
toggle_len = sizeof(toggle);
setsockopt(sockfd, SOL_IP, IP_PASSSEC, &toggle, &toggle_len);
recvmsg(sockfd, &msg_hdr, 0);
if (msg_hdr.msg_controllen > sizeof(struct cmsghdr)) {
cmsg_hdr = CMSG_FIRSTHDR(&msg_hdr);
if (cmsg_hdr->cmsg_len <= CMSG_LEN(sizeof(scontext)) &&
cmsg_hdr->cmsg_level == SOL_IP &&
cmsg_hdr->cmsg_type == SCM_SECURITY) {
memcpy(&scontext, CMSG_DATA(cmsg_hdr), sizeof(scontext));
}
}
ip_setsockopt is enhanced with a new socket option IP_PASSSEC to allow
a server socket to receive security context of the peer. A new
ancillary message type SCM_SECURITY.
When the packet is received we get the security context from the
sec_path pointer which is contained in the sk_buff, and copy it to the
ancillary message space. An additional LSM hook,
selinux_socket_getpeersec_udp, is defined to retrieve the security
context from the SELinux space. The existing function,
selinux_socket_getpeersec does not suit our purpose, because the
security context is copied directly to user space, rather than to
kernel space.
Testing:
We have tested the patch by setting up TCP and UDP connections between
applications on two machines using the IPSec policies that result in
labeled security associations being built. For TCP, we can then
extract the peer security context using getsockopt on either end. For
UDP, the receiving end can retrieve the security context using the
auxiliary data mechanism of recvmsg.
Signed-off-by: Catherine Zhang <cxzhang@watson.ibm.com>
Acked-by: James Morris <jmorris@namei.org>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-21 14:41:23 +08:00
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#define IP_CMSG_PASSSEC 32
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2005-04-17 06:20:36 +08:00
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/*
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* SOL_IP control messages.
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*/
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static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
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{
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struct in_pktinfo info;
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2008-03-06 10:30:47 +08:00
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struct rtable *rt = skb->rtable;
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2005-04-17 06:20:36 +08:00
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2007-04-21 13:47:35 +08:00
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info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
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2005-04-17 06:20:36 +08:00
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if (rt) {
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info.ipi_ifindex = rt->rt_iif;
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info.ipi_spec_dst.s_addr = rt->rt_spec_dst;
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} else {
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info.ipi_ifindex = 0;
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info.ipi_spec_dst.s_addr = 0;
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}
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put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
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}
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static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
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{
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2007-04-21 13:47:35 +08:00
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int ttl = ip_hdr(skb)->ttl;
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2005-04-17 06:20:36 +08:00
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put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
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}
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static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
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{
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2007-04-21 13:47:35 +08:00
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put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
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2005-04-17 06:20:36 +08:00
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}
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static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
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{
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if (IPCB(skb)->opt.optlen == 0)
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return;
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2007-04-21 13:47:35 +08:00
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put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
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ip_hdr(skb) + 1);
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2005-04-17 06:20:36 +08:00
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}
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static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
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{
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unsigned char optbuf[sizeof(struct ip_options) + 40];
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struct ip_options * opt = (struct ip_options*)optbuf;
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if (IPCB(skb)->opt.optlen == 0)
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return;
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if (ip_options_echo(opt, skb)) {
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msg->msg_flags |= MSG_CTRUNC;
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return;
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}
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ip_options_undo(opt);
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put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
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}
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[SECURITY]: TCP/UDP getpeersec
This patch implements an application of the LSM-IPSec networking
controls whereby an application can determine the label of the
security association its TCP or UDP sockets are currently connected to
via getsockopt and the auxiliary data mechanism of recvmsg.
Patch purpose:
This patch enables a security-aware application to retrieve the
security context of an IPSec security association a particular TCP or
UDP socket is using. The application can then use this security
context to determine the security context for processing on behalf of
the peer at the other end of this connection. In the case of UDP, the
security context is for each individual packet. An example
application is the inetd daemon, which could be modified to start
daemons running at security contexts dependent on the remote client.
Patch design approach:
- Design for TCP
The patch enables the SELinux LSM to set the peer security context for
a socket based on the security context of the IPSec security
association. The application may retrieve this context using
getsockopt. When called, the kernel determines if the socket is a
connected (TCP_ESTABLISHED) TCP socket and, if so, uses the dst_entry
cache on the socket to retrieve the security associations. If a
security association has a security context, the context string is
returned, as for UNIX domain sockets.
- Design for UDP
Unlike TCP, UDP is connectionless. This requires a somewhat different
API to retrieve the peer security context. With TCP, the peer
security context stays the same throughout the connection, thus it can
be retrieved at any time between when the connection is established
and when it is torn down. With UDP, each read/write can have
different peer and thus the security context might change every time.
As a result the security context retrieval must be done TOGETHER with
the packet retrieval.
The solution is to build upon the existing Unix domain socket API for
retrieving user credentials. Linux offers the API for obtaining user
credentials via ancillary messages (i.e., out of band/control messages
that are bundled together with a normal message).
Patch implementation details:
- Implementation for TCP
The security context can be retrieved by applications using getsockopt
with the existing SO_PEERSEC flag. As an example (ignoring error
checking):
getsockopt(sockfd, SOL_SOCKET, SO_PEERSEC, optbuf, &optlen);
printf("Socket peer context is: %s\n", optbuf);
The SELinux function, selinux_socket_getpeersec, is extended to check
for labeled security associations for connected (TCP_ESTABLISHED ==
sk->sk_state) TCP sockets only. If so, the socket has a dst_cache of
struct dst_entry values that may refer to security associations. If
these have security associations with security contexts, the security
context is returned.
getsockopt returns a buffer that contains a security context string or
the buffer is unmodified.
- Implementation for UDP
To retrieve the security context, the application first indicates to
the kernel such desire by setting the IP_PASSSEC option via
getsockopt. Then the application retrieves the security context using
the auxiliary data mechanism.
An example server application for UDP should look like this:
toggle = 1;
toggle_len = sizeof(toggle);
setsockopt(sockfd, SOL_IP, IP_PASSSEC, &toggle, &toggle_len);
recvmsg(sockfd, &msg_hdr, 0);
if (msg_hdr.msg_controllen > sizeof(struct cmsghdr)) {
cmsg_hdr = CMSG_FIRSTHDR(&msg_hdr);
if (cmsg_hdr->cmsg_len <= CMSG_LEN(sizeof(scontext)) &&
cmsg_hdr->cmsg_level == SOL_IP &&
cmsg_hdr->cmsg_type == SCM_SECURITY) {
memcpy(&scontext, CMSG_DATA(cmsg_hdr), sizeof(scontext));
}
}
ip_setsockopt is enhanced with a new socket option IP_PASSSEC to allow
a server socket to receive security context of the peer. A new
ancillary message type SCM_SECURITY.
When the packet is received we get the security context from the
sec_path pointer which is contained in the sk_buff, and copy it to the
ancillary message space. An additional LSM hook,
selinux_socket_getpeersec_udp, is defined to retrieve the security
context from the SELinux space. The existing function,
selinux_socket_getpeersec does not suit our purpose, because the
security context is copied directly to user space, rather than to
kernel space.
Testing:
We have tested the patch by setting up TCP and UDP connections between
applications on two machines using the IPSec policies that result in
labeled security associations being built. For TCP, we can then
extract the peer security context using getsockopt on either end. For
UDP, the receiving end can retrieve the security context using the
auxiliary data mechanism of recvmsg.
Signed-off-by: Catherine Zhang <cxzhang@watson.ibm.com>
Acked-by: James Morris <jmorris@namei.org>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-21 14:41:23 +08:00
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static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
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{
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char *secdata;
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2006-08-03 05:12:06 +08:00
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u32 seclen, secid;
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[SECURITY]: TCP/UDP getpeersec
This patch implements an application of the LSM-IPSec networking
controls whereby an application can determine the label of the
security association its TCP or UDP sockets are currently connected to
via getsockopt and the auxiliary data mechanism of recvmsg.
Patch purpose:
This patch enables a security-aware application to retrieve the
security context of an IPSec security association a particular TCP or
UDP socket is using. The application can then use this security
context to determine the security context for processing on behalf of
the peer at the other end of this connection. In the case of UDP, the
security context is for each individual packet. An example
application is the inetd daemon, which could be modified to start
daemons running at security contexts dependent on the remote client.
Patch design approach:
- Design for TCP
The patch enables the SELinux LSM to set the peer security context for
a socket based on the security context of the IPSec security
association. The application may retrieve this context using
getsockopt. When called, the kernel determines if the socket is a
connected (TCP_ESTABLISHED) TCP socket and, if so, uses the dst_entry
cache on the socket to retrieve the security associations. If a
security association has a security context, the context string is
returned, as for UNIX domain sockets.
- Design for UDP
Unlike TCP, UDP is connectionless. This requires a somewhat different
API to retrieve the peer security context. With TCP, the peer
security context stays the same throughout the connection, thus it can
be retrieved at any time between when the connection is established
and when it is torn down. With UDP, each read/write can have
different peer and thus the security context might change every time.
As a result the security context retrieval must be done TOGETHER with
the packet retrieval.
The solution is to build upon the existing Unix domain socket API for
retrieving user credentials. Linux offers the API for obtaining user
credentials via ancillary messages (i.e., out of band/control messages
that are bundled together with a normal message).
Patch implementation details:
- Implementation for TCP
The security context can be retrieved by applications using getsockopt
with the existing SO_PEERSEC flag. As an example (ignoring error
checking):
getsockopt(sockfd, SOL_SOCKET, SO_PEERSEC, optbuf, &optlen);
printf("Socket peer context is: %s\n", optbuf);
The SELinux function, selinux_socket_getpeersec, is extended to check
for labeled security associations for connected (TCP_ESTABLISHED ==
sk->sk_state) TCP sockets only. If so, the socket has a dst_cache of
struct dst_entry values that may refer to security associations. If
these have security associations with security contexts, the security
context is returned.
getsockopt returns a buffer that contains a security context string or
the buffer is unmodified.
- Implementation for UDP
To retrieve the security context, the application first indicates to
the kernel such desire by setting the IP_PASSSEC option via
getsockopt. Then the application retrieves the security context using
the auxiliary data mechanism.
An example server application for UDP should look like this:
toggle = 1;
toggle_len = sizeof(toggle);
setsockopt(sockfd, SOL_IP, IP_PASSSEC, &toggle, &toggle_len);
recvmsg(sockfd, &msg_hdr, 0);
if (msg_hdr.msg_controllen > sizeof(struct cmsghdr)) {
cmsg_hdr = CMSG_FIRSTHDR(&msg_hdr);
if (cmsg_hdr->cmsg_len <= CMSG_LEN(sizeof(scontext)) &&
cmsg_hdr->cmsg_level == SOL_IP &&
cmsg_hdr->cmsg_type == SCM_SECURITY) {
memcpy(&scontext, CMSG_DATA(cmsg_hdr), sizeof(scontext));
}
}
ip_setsockopt is enhanced with a new socket option IP_PASSSEC to allow
a server socket to receive security context of the peer. A new
ancillary message type SCM_SECURITY.
When the packet is received we get the security context from the
sec_path pointer which is contained in the sk_buff, and copy it to the
ancillary message space. An additional LSM hook,
selinux_socket_getpeersec_udp, is defined to retrieve the security
context from the SELinux space. The existing function,
selinux_socket_getpeersec does not suit our purpose, because the
security context is copied directly to user space, rather than to
kernel space.
Testing:
We have tested the patch by setting up TCP and UDP connections between
applications on two machines using the IPSec policies that result in
labeled security associations being built. For TCP, we can then
extract the peer security context using getsockopt on either end. For
UDP, the receiving end can retrieve the security context using the
auxiliary data mechanism of recvmsg.
Signed-off-by: Catherine Zhang <cxzhang@watson.ibm.com>
Acked-by: James Morris <jmorris@namei.org>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-21 14:41:23 +08:00
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int err;
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2006-08-03 05:12:06 +08:00
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err = security_socket_getpeersec_dgram(NULL, skb, &secid);
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if (err)
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return;
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err = security_secid_to_secctx(secid, &secdata, &seclen);
|
[SECURITY]: TCP/UDP getpeersec
This patch implements an application of the LSM-IPSec networking
controls whereby an application can determine the label of the
security association its TCP or UDP sockets are currently connected to
via getsockopt and the auxiliary data mechanism of recvmsg.
Patch purpose:
This patch enables a security-aware application to retrieve the
security context of an IPSec security association a particular TCP or
UDP socket is using. The application can then use this security
context to determine the security context for processing on behalf of
the peer at the other end of this connection. In the case of UDP, the
security context is for each individual packet. An example
application is the inetd daemon, which could be modified to start
daemons running at security contexts dependent on the remote client.
Patch design approach:
- Design for TCP
The patch enables the SELinux LSM to set the peer security context for
a socket based on the security context of the IPSec security
association. The application may retrieve this context using
getsockopt. When called, the kernel determines if the socket is a
connected (TCP_ESTABLISHED) TCP socket and, if so, uses the dst_entry
cache on the socket to retrieve the security associations. If a
security association has a security context, the context string is
returned, as for UNIX domain sockets.
- Design for UDP
Unlike TCP, UDP is connectionless. This requires a somewhat different
API to retrieve the peer security context. With TCP, the peer
security context stays the same throughout the connection, thus it can
be retrieved at any time between when the connection is established
and when it is torn down. With UDP, each read/write can have
different peer and thus the security context might change every time.
As a result the security context retrieval must be done TOGETHER with
the packet retrieval.
The solution is to build upon the existing Unix domain socket API for
retrieving user credentials. Linux offers the API for obtaining user
credentials via ancillary messages (i.e., out of band/control messages
that are bundled together with a normal message).
Patch implementation details:
- Implementation for TCP
The security context can be retrieved by applications using getsockopt
with the existing SO_PEERSEC flag. As an example (ignoring error
checking):
getsockopt(sockfd, SOL_SOCKET, SO_PEERSEC, optbuf, &optlen);
printf("Socket peer context is: %s\n", optbuf);
The SELinux function, selinux_socket_getpeersec, is extended to check
for labeled security associations for connected (TCP_ESTABLISHED ==
sk->sk_state) TCP sockets only. If so, the socket has a dst_cache of
struct dst_entry values that may refer to security associations. If
these have security associations with security contexts, the security
context is returned.
getsockopt returns a buffer that contains a security context string or
the buffer is unmodified.
- Implementation for UDP
To retrieve the security context, the application first indicates to
the kernel such desire by setting the IP_PASSSEC option via
getsockopt. Then the application retrieves the security context using
the auxiliary data mechanism.
An example server application for UDP should look like this:
toggle = 1;
toggle_len = sizeof(toggle);
setsockopt(sockfd, SOL_IP, IP_PASSSEC, &toggle, &toggle_len);
recvmsg(sockfd, &msg_hdr, 0);
if (msg_hdr.msg_controllen > sizeof(struct cmsghdr)) {
cmsg_hdr = CMSG_FIRSTHDR(&msg_hdr);
if (cmsg_hdr->cmsg_len <= CMSG_LEN(sizeof(scontext)) &&
cmsg_hdr->cmsg_level == SOL_IP &&
cmsg_hdr->cmsg_type == SCM_SECURITY) {
memcpy(&scontext, CMSG_DATA(cmsg_hdr), sizeof(scontext));
}
}
ip_setsockopt is enhanced with a new socket option IP_PASSSEC to allow
a server socket to receive security context of the peer. A new
ancillary message type SCM_SECURITY.
When the packet is received we get the security context from the
sec_path pointer which is contained in the sk_buff, and copy it to the
ancillary message space. An additional LSM hook,
selinux_socket_getpeersec_udp, is defined to retrieve the security
context from the SELinux space. The existing function,
selinux_socket_getpeersec does not suit our purpose, because the
security context is copied directly to user space, rather than to
kernel space.
Testing:
We have tested the patch by setting up TCP and UDP connections between
applications on two machines using the IPSec policies that result in
labeled security associations being built. For TCP, we can then
extract the peer security context using getsockopt on either end. For
UDP, the receiving end can retrieve the security context using the
auxiliary data mechanism of recvmsg.
Signed-off-by: Catherine Zhang <cxzhang@watson.ibm.com>
Acked-by: James Morris <jmorris@namei.org>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-21 14:41:23 +08:00
|
|
|
if (err)
|
|
|
|
|
return;
|
|
|
|
|
|
|
|
|
|
put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
|
2006-08-03 05:12:06 +08:00
|
|
|
security_release_secctx(secdata, seclen);
|
[SECURITY]: TCP/UDP getpeersec
This patch implements an application of the LSM-IPSec networking
controls whereby an application can determine the label of the
security association its TCP or UDP sockets are currently connected to
via getsockopt and the auxiliary data mechanism of recvmsg.
Patch purpose:
This patch enables a security-aware application to retrieve the
security context of an IPSec security association a particular TCP or
UDP socket is using. The application can then use this security
context to determine the security context for processing on behalf of
the peer at the other end of this connection. In the case of UDP, the
security context is for each individual packet. An example
application is the inetd daemon, which could be modified to start
daemons running at security contexts dependent on the remote client.
Patch design approach:
- Design for TCP
The patch enables the SELinux LSM to set the peer security context for
a socket based on the security context of the IPSec security
association. The application may retrieve this context using
getsockopt. When called, the kernel determines if the socket is a
connected (TCP_ESTABLISHED) TCP socket and, if so, uses the dst_entry
cache on the socket to retrieve the security associations. If a
security association has a security context, the context string is
returned, as for UNIX domain sockets.
- Design for UDP
Unlike TCP, UDP is connectionless. This requires a somewhat different
API to retrieve the peer security context. With TCP, the peer
security context stays the same throughout the connection, thus it can
be retrieved at any time between when the connection is established
and when it is torn down. With UDP, each read/write can have
different peer and thus the security context might change every time.
As a result the security context retrieval must be done TOGETHER with
the packet retrieval.
The solution is to build upon the existing Unix domain socket API for
retrieving user credentials. Linux offers the API for obtaining user
credentials via ancillary messages (i.e., out of band/control messages
that are bundled together with a normal message).
Patch implementation details:
- Implementation for TCP
The security context can be retrieved by applications using getsockopt
with the existing SO_PEERSEC flag. As an example (ignoring error
checking):
getsockopt(sockfd, SOL_SOCKET, SO_PEERSEC, optbuf, &optlen);
printf("Socket peer context is: %s\n", optbuf);
The SELinux function, selinux_socket_getpeersec, is extended to check
for labeled security associations for connected (TCP_ESTABLISHED ==
sk->sk_state) TCP sockets only. If so, the socket has a dst_cache of
struct dst_entry values that may refer to security associations. If
these have security associations with security contexts, the security
context is returned.
getsockopt returns a buffer that contains a security context string or
the buffer is unmodified.
- Implementation for UDP
To retrieve the security context, the application first indicates to
the kernel such desire by setting the IP_PASSSEC option via
getsockopt. Then the application retrieves the security context using
the auxiliary data mechanism.
An example server application for UDP should look like this:
toggle = 1;
toggle_len = sizeof(toggle);
setsockopt(sockfd, SOL_IP, IP_PASSSEC, &toggle, &toggle_len);
recvmsg(sockfd, &msg_hdr, 0);
if (msg_hdr.msg_controllen > sizeof(struct cmsghdr)) {
cmsg_hdr = CMSG_FIRSTHDR(&msg_hdr);
if (cmsg_hdr->cmsg_len <= CMSG_LEN(sizeof(scontext)) &&
cmsg_hdr->cmsg_level == SOL_IP &&
cmsg_hdr->cmsg_type == SCM_SECURITY) {
memcpy(&scontext, CMSG_DATA(cmsg_hdr), sizeof(scontext));
}
}
ip_setsockopt is enhanced with a new socket option IP_PASSSEC to allow
a server socket to receive security context of the peer. A new
ancillary message type SCM_SECURITY.
When the packet is received we get the security context from the
sec_path pointer which is contained in the sk_buff, and copy it to the
ancillary message space. An additional LSM hook,
selinux_socket_getpeersec_udp, is defined to retrieve the security
context from the SELinux space. The existing function,
selinux_socket_getpeersec does not suit our purpose, because the
security context is copied directly to user space, rather than to
kernel space.
Testing:
We have tested the patch by setting up TCP and UDP connections between
applications on two machines using the IPSec policies that result in
labeled security associations being built. For TCP, we can then
extract the peer security context using getsockopt on either end. For
UDP, the receiving end can retrieve the security context using the
auxiliary data mechanism of recvmsg.
Signed-off-by: Catherine Zhang <cxzhang@watson.ibm.com>
Acked-by: James Morris <jmorris@namei.org>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-21 14:41:23 +08:00
|
|
|
}
|
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
|
void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
|
|
|
|
|
{
|
|
|
|
|
struct inet_sock *inet = inet_sk(skb->sk);
|
|
|
|
|
unsigned flags = inet->cmsg_flags;
|
|
|
|
|
|
|
|
|
|
/* Ordered by supposed usage frequency */
|
|
|
|
|
if (flags & 1)
|
|
|
|
|
ip_cmsg_recv_pktinfo(msg, skb);
|
|
|
|
|
if ((flags>>=1) == 0)
|
|
|
|
|
return;
|
|
|
|
|
|
|
|
|
|
if (flags & 1)
|
|
|
|
|
ip_cmsg_recv_ttl(msg, skb);
|
|
|
|
|
if ((flags>>=1) == 0)
|
|
|
|
|
return;
|
|
|
|
|
|
|
|
|
|
if (flags & 1)
|
|
|
|
|
ip_cmsg_recv_tos(msg, skb);
|
|
|
|
|
if ((flags>>=1) == 0)
|
|
|
|
|
return;
|
|
|
|
|
|
|
|
|
|
if (flags & 1)
|
|
|
|
|
ip_cmsg_recv_opts(msg, skb);
|
|
|
|
|
if ((flags>>=1) == 0)
|
|
|
|
|
return;
|
|
|
|
|
|
|
|
|
|
if (flags & 1)
|
|
|
|
|
ip_cmsg_recv_retopts(msg, skb);
|
[SECURITY]: TCP/UDP getpeersec
This patch implements an application of the LSM-IPSec networking
controls whereby an application can determine the label of the
security association its TCP or UDP sockets are currently connected to
via getsockopt and the auxiliary data mechanism of recvmsg.
Patch purpose:
This patch enables a security-aware application to retrieve the
security context of an IPSec security association a particular TCP or
UDP socket is using. The application can then use this security
context to determine the security context for processing on behalf of
the peer at the other end of this connection. In the case of UDP, the
security context is for each individual packet. An example
application is the inetd daemon, which could be modified to start
daemons running at security contexts dependent on the remote client.
Patch design approach:
- Design for TCP
The patch enables the SELinux LSM to set the peer security context for
a socket based on the security context of the IPSec security
association. The application may retrieve this context using
getsockopt. When called, the kernel determines if the socket is a
connected (TCP_ESTABLISHED) TCP socket and, if so, uses the dst_entry
cache on the socket to retrieve the security associations. If a
security association has a security context, the context string is
returned, as for UNIX domain sockets.
- Design for UDP
Unlike TCP, UDP is connectionless. This requires a somewhat different
API to retrieve the peer security context. With TCP, the peer
security context stays the same throughout the connection, thus it can
be retrieved at any time between when the connection is established
and when it is torn down. With UDP, each read/write can have
different peer and thus the security context might change every time.
As a result the security context retrieval must be done TOGETHER with
the packet retrieval.
The solution is to build upon the existing Unix domain socket API for
retrieving user credentials. Linux offers the API for obtaining user
credentials via ancillary messages (i.e., out of band/control messages
that are bundled together with a normal message).
Patch implementation details:
- Implementation for TCP
The security context can be retrieved by applications using getsockopt
with the existing SO_PEERSEC flag. As an example (ignoring error
checking):
getsockopt(sockfd, SOL_SOCKET, SO_PEERSEC, optbuf, &optlen);
printf("Socket peer context is: %s\n", optbuf);
The SELinux function, selinux_socket_getpeersec, is extended to check
for labeled security associations for connected (TCP_ESTABLISHED ==
sk->sk_state) TCP sockets only. If so, the socket has a dst_cache of
struct dst_entry values that may refer to security associations. If
these have security associations with security contexts, the security
context is returned.
getsockopt returns a buffer that contains a security context string or
the buffer is unmodified.
- Implementation for UDP
To retrieve the security context, the application first indicates to
the kernel such desire by setting the IP_PASSSEC option via
getsockopt. Then the application retrieves the security context using
the auxiliary data mechanism.
An example server application for UDP should look like this:
toggle = 1;
toggle_len = sizeof(toggle);
setsockopt(sockfd, SOL_IP, IP_PASSSEC, &toggle, &toggle_len);
recvmsg(sockfd, &msg_hdr, 0);
if (msg_hdr.msg_controllen > sizeof(struct cmsghdr)) {
cmsg_hdr = CMSG_FIRSTHDR(&msg_hdr);
if (cmsg_hdr->cmsg_len <= CMSG_LEN(sizeof(scontext)) &&
cmsg_hdr->cmsg_level == SOL_IP &&
cmsg_hdr->cmsg_type == SCM_SECURITY) {
memcpy(&scontext, CMSG_DATA(cmsg_hdr), sizeof(scontext));
}
}
ip_setsockopt is enhanced with a new socket option IP_PASSSEC to allow
a server socket to receive security context of the peer. A new
ancillary message type SCM_SECURITY.
When the packet is received we get the security context from the
sec_path pointer which is contained in the sk_buff, and copy it to the
ancillary message space. An additional LSM hook,
selinux_socket_getpeersec_udp, is defined to retrieve the security
context from the SELinux space. The existing function,
selinux_socket_getpeersec does not suit our purpose, because the
security context is copied directly to user space, rather than to
kernel space.
Testing:
We have tested the patch by setting up TCP and UDP connections between
applications on two machines using the IPSec policies that result in
labeled security associations being built. For TCP, we can then
extract the peer security context using getsockopt on either end. For
UDP, the receiving end can retrieve the security context using the
auxiliary data mechanism of recvmsg.
Signed-off-by: Catherine Zhang <cxzhang@watson.ibm.com>
Acked-by: James Morris <jmorris@namei.org>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-21 14:41:23 +08:00
|
|
|
if ((flags>>=1) == 0)
|
|
|
|
|
return;
|
|
|
|
|
|
|
|
|
|
if (flags & 1)
|
|
|
|
|
ip_cmsg_recv_security(msg, skb);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
|
2008-03-25 06:30:27 +08:00
|
|
|
int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
|
int err;
|
|
|
|
|
struct cmsghdr *cmsg;
|
|
|
|
|
|
|
|
|
|
for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
|
|
|
|
|
if (!CMSG_OK(msg, cmsg))
|
|
|
|
|
return -EINVAL;
|
|
|
|
|
if (cmsg->cmsg_level != SOL_IP)
|
|
|
|
|
continue;
|
|
|
|
|
switch (cmsg->cmsg_type) {
|
|
|
|
|
case IP_RETOPTS:
|
|
|
|
|
err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
|
2008-03-25 06:30:27 +08:00
|
|
|
err = ip_options_get(net, &ipc->opt, CMSG_DATA(cmsg), err < 40 ? err : 40);
|
2005-04-17 06:20:36 +08:00
|
|
|
if (err)
|
|
|
|
|
return err;
|
|
|
|
|
break;
|
|
|
|
|
case IP_PKTINFO:
|
|
|
|
|
{
|
|
|
|
|
struct in_pktinfo *info;
|
|
|
|
|
if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
|
|
|
|
|
return -EINVAL;
|
|
|
|
|
info = (struct in_pktinfo *)CMSG_DATA(cmsg);
|
|
|
|
|
ipc->oif = info->ipi_ifindex;
|
|
|
|
|
ipc->addr = info->ipi_spec_dst.s_addr;
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
default:
|
|
|
|
|
return -EINVAL;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* Special input handler for packets caught by router alert option.
|
|
|
|
|
They are selected only by protocol field, and then processed likely
|
|
|
|
|
local ones; but only if someone wants them! Otherwise, router
|
|
|
|
|
not running rsvpd will kill RSVP.
|
|
|
|
|
|
|
|
|
|
It is user level problem, what it will make with them.
|
|
|
|
|
I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
|
|
|
|
|
but receiver should be enough clever f.e. to forward mtrace requests,
|
|
|
|
|
sent to multicast group to reach destination designated router.
|
|
|
|
|
*/
|
|
|
|
|
struct ip_ra_chain *ip_ra_chain;
|
|
|
|
|
DEFINE_RWLOCK(ip_ra_lock);
|
|
|
|
|
|
|
|
|
|
int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *))
|
|
|
|
|
{
|
|
|
|
|
struct ip_ra_chain *ra, *new_ra, **rap;
|
|
|
|
|
|
|
|
|
|
if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num == IPPROTO_RAW)
|
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
|
|
new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
|
|
|
|
|
|
|
|
|
|
write_lock_bh(&ip_ra_lock);
|
|
|
|
|
for (rap = &ip_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
|
|
|
|
|
if (ra->sk == sk) {
|
|
|
|
|
if (on) {
|
|
|
|
|
write_unlock_bh(&ip_ra_lock);
|
2005-11-09 01:41:34 +08:00
|
|
|
kfree(new_ra);
|
2005-04-17 06:20:36 +08:00
|
|
|
return -EADDRINUSE;
|
|
|
|
|
}
|
|
|
|
|
*rap = ra->next;
|
|
|
|
|
write_unlock_bh(&ip_ra_lock);
|
|
|
|
|
|
|
|
|
|
if (ra->destructor)
|
|
|
|
|
ra->destructor(sk);
|
|
|
|
|
sock_put(sk);
|
|
|
|
|
kfree(ra);
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
if (new_ra == NULL) {
|
|
|
|
|
write_unlock_bh(&ip_ra_lock);
|
|
|
|
|
return -ENOBUFS;
|
|
|
|
|
}
|
|
|
|
|
new_ra->sk = sk;
|
|
|
|
|
new_ra->destructor = destructor;
|
|
|
|
|
|
|
|
|
|
new_ra->next = ra;
|
|
|
|
|
*rap = new_ra;
|
|
|
|
|
sock_hold(sk);
|
|
|
|
|
write_unlock_bh(&ip_ra_lock);
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
2007-02-09 22:24:47 +08:00
|
|
|
void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
|
2006-09-28 09:34:21 +08:00
|
|
|
__be16 port, u32 info, u8 *payload)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
|
|
|
struct sock_exterr_skb *serr;
|
|
|
|
|
|
|
|
|
|
if (!inet->recverr)
|
|
|
|
|
return;
|
|
|
|
|
|
|
|
|
|
skb = skb_clone(skb, GFP_ATOMIC);
|
|
|
|
|
if (!skb)
|
|
|
|
|
return;
|
|
|
|
|
|
2007-02-09 22:24:47 +08:00
|
|
|
serr = SKB_EXT_ERR(skb);
|
2005-04-17 06:20:36 +08:00
|
|
|
serr->ee.ee_errno = err;
|
|
|
|
|
serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
|
2007-03-14 01:43:18 +08:00
|
|
|
serr->ee.ee_type = icmp_hdr(skb)->type;
|
|
|
|
|
serr->ee.ee_code = icmp_hdr(skb)->code;
|
2005-04-17 06:20:36 +08:00
|
|
|
serr->ee.ee_pad = 0;
|
|
|
|
|
serr->ee.ee_info = info;
|
|
|
|
|
serr->ee.ee_data = 0;
|
2007-03-14 01:43:18 +08:00
|
|
|
serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
|
2007-04-11 11:50:43 +08:00
|
|
|
skb_network_header(skb);
|
2005-04-17 06:20:36 +08:00
|
|
|
serr->port = port;
|
|
|
|
|
|
2007-03-14 04:10:43 +08:00
|
|
|
if (skb_pull(skb, payload - skb->data) != NULL) {
|
|
|
|
|
skb_reset_transport_header(skb);
|
|
|
|
|
if (sock_queue_err_skb(sk, skb) == 0)
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
kfree_skb(skb);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
|
2006-09-28 09:33:40 +08:00
|
|
|
void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
|
|
|
struct sock_exterr_skb *serr;
|
|
|
|
|
struct iphdr *iph;
|
|
|
|
|
struct sk_buff *skb;
|
|
|
|
|
|
|
|
|
|
if (!inet->recverr)
|
|
|
|
|
return;
|
|
|
|
|
|
|
|
|
|
skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
|
|
|
|
|
if (!skb)
|
|
|
|
|
return;
|
|
|
|
|
|
2007-03-11 06:15:25 +08:00
|
|
|
skb_put(skb, sizeof(struct iphdr));
|
|
|
|
|
skb_reset_network_header(skb);
|
2007-04-21 13:47:35 +08:00
|
|
|
iph = ip_hdr(skb);
|
2005-04-17 06:20:36 +08:00
|
|
|
iph->daddr = daddr;
|
|
|
|
|
|
2007-02-09 22:24:47 +08:00
|
|
|
serr = SKB_EXT_ERR(skb);
|
2005-04-17 06:20:36 +08:00
|
|
|
serr->ee.ee_errno = err;
|
|
|
|
|
serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
|
2007-02-09 22:24:47 +08:00
|
|
|
serr->ee.ee_type = 0;
|
2005-04-17 06:20:36 +08:00
|
|
|
serr->ee.ee_code = 0;
|
|
|
|
|
serr->ee.ee_pad = 0;
|
|
|
|
|
serr->ee.ee_info = info;
|
|
|
|
|
serr->ee.ee_data = 0;
|
2007-04-11 11:50:43 +08:00
|
|
|
serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
|
2005-04-17 06:20:36 +08:00
|
|
|
serr->port = port;
|
|
|
|
|
|
2007-04-20 11:29:13 +08:00
|
|
|
__skb_pull(skb, skb_tail_pointer(skb) - skb->data);
|
2007-03-14 04:10:43 +08:00
|
|
|
skb_reset_transport_header(skb);
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
|
if (sock_queue_err_skb(sk, skb))
|
|
|
|
|
kfree_skb(skb);
|
|
|
|
|
}
|
|
|
|
|
|
2007-02-09 22:24:47 +08:00
|
|
|
/*
|
2005-04-17 06:20:36 +08:00
|
|
|
* Handle MSG_ERRQUEUE
|
|
|
|
|
*/
|
|
|
|
|
int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
|
|
|
|
|
{
|
|
|
|
|
struct sock_exterr_skb *serr;
|
|
|
|
|
struct sk_buff *skb, *skb2;
|
|
|
|
|
struct sockaddr_in *sin;
|
|
|
|
|
struct {
|
|
|
|
|
struct sock_extended_err ee;
|
|
|
|
|
struct sockaddr_in offender;
|
|
|
|
|
} errhdr;
|
|
|
|
|
int err;
|
|
|
|
|
int copied;
|
|
|
|
|
|
|
|
|
|
err = -EAGAIN;
|
|
|
|
|
skb = skb_dequeue(&sk->sk_error_queue);
|
|
|
|
|
if (skb == NULL)
|
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
|
|
copied = skb->len;
|
|
|
|
|
if (copied > len) {
|
|
|
|
|
msg->msg_flags |= MSG_TRUNC;
|
|
|
|
|
copied = len;
|
|
|
|
|
}
|
|
|
|
|
err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
|
|
|
|
|
if (err)
|
|
|
|
|
goto out_free_skb;
|
|
|
|
|
|
|
|
|
|
sock_recv_timestamp(msg, sk, skb);
|
|
|
|
|
|
|
|
|
|
serr = SKB_EXT_ERR(skb);
|
|
|
|
|
|
|
|
|
|
sin = (struct sockaddr_in *)msg->msg_name;
|
|
|
|
|
if (sin) {
|
|
|
|
|
sin->sin_family = AF_INET;
|
2007-04-11 11:50:43 +08:00
|
|
|
sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
|
|
|
|
|
serr->addr_offset);
|
2005-04-17 06:20:36 +08:00
|
|
|
sin->sin_port = serr->port;
|
|
|
|
|
memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
|
|
|
|
|
sin = &errhdr.offender;
|
|
|
|
|
sin->sin_family = AF_UNSPEC;
|
|
|
|
|
if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
|
|
|
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
|
|
|
|
|
|
|
|
sin->sin_family = AF_INET;
|
2007-04-21 13:47:35 +08:00
|
|
|
sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
|
2005-04-17 06:20:36 +08:00
|
|
|
sin->sin_port = 0;
|
|
|
|
|
memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
|
|
|
|
|
if (inet->cmsg_flags)
|
|
|
|
|
ip_cmsg_recv(msg, skb);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
|
|
|
|
|
|
|
|
|
|
/* Now we could try to dump offended packet options */
|
|
|
|
|
|
|
|
|
|
msg->msg_flags |= MSG_ERRQUEUE;
|
|
|
|
|
err = copied;
|
|
|
|
|
|
|
|
|
|
/* Reset and regenerate socket error */
|
2005-06-19 13:56:18 +08:00
|
|
|
spin_lock_bh(&sk->sk_error_queue.lock);
|
2005-04-17 06:20:36 +08:00
|
|
|
sk->sk_err = 0;
|
|
|
|
|
if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
|
|
|
|
|
sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
|
2005-06-19 13:56:18 +08:00
|
|
|
spin_unlock_bh(&sk->sk_error_queue.lock);
|
2005-04-17 06:20:36 +08:00
|
|
|
sk->sk_error_report(sk);
|
|
|
|
|
} else
|
2005-06-19 13:56:18 +08:00
|
|
|
spin_unlock_bh(&sk->sk_error_queue.lock);
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2007-02-09 22:24:47 +08:00
|
|
|
out_free_skb:
|
2005-04-17 06:20:36 +08:00
|
|
|
kfree_skb(skb);
|
|
|
|
|
out:
|
|
|
|
|
return err;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Socket option code for IP. This is the end of the line after any TCP,UDP etc options on
|
|
|
|
|
* an IP socket.
|
|
|
|
|
*/
|
|
|
|
|
|
2006-03-21 14:45:21 +08:00
|
|
|
static int do_ip_setsockopt(struct sock *sk, int level,
|
2007-03-09 12:44:43 +08:00
|
|
|
int optname, char __user *optval, int optlen)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
|
|
|
int val=0,err;
|
|
|
|
|
|
2007-02-09 22:24:47 +08:00
|
|
|
if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) |
|
2007-03-09 12:44:43 +08:00
|
|
|
(1<<IP_RECVOPTS) | (1<<IP_RECVTOS) |
|
|
|
|
|
(1<<IP_RETOPTS) | (1<<IP_TOS) |
|
|
|
|
|
(1<<IP_TTL) | (1<<IP_HDRINCL) |
|
|
|
|
|
(1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) |
|
|
|
|
|
(1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) |
|
2008-10-01 22:30:02 +08:00
|
|
|
(1<<IP_PASSSEC) | (1<<IP_TRANSPARENT))) ||
|
2007-03-09 12:44:43 +08:00
|
|
|
optname == IP_MULTICAST_TTL ||
|
|
|
|
|
optname == IP_MULTICAST_LOOP) {
|
2005-04-17 06:20:36 +08:00
|
|
|
if (optlen >= sizeof(int)) {
|
|
|
|
|
if (get_user(val, (int __user *) optval))
|
|
|
|
|
return -EFAULT;
|
|
|
|
|
} else if (optlen >= sizeof(char)) {
|
|
|
|
|
unsigned char ucval;
|
|
|
|
|
|
|
|
|
|
if (get_user(ucval, (unsigned char __user *) optval))
|
|
|
|
|
return -EFAULT;
|
|
|
|
|
val = (int) ucval;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* If optlen==0, it is equivalent to val == 0 */
|
|
|
|
|
|
2007-11-06 13:32:31 +08:00
|
|
|
if (ip_mroute_opt(optname))
|
2005-04-17 06:20:36 +08:00
|
|
|
return ip_mroute_setsockopt(sk,optname,optval,optlen);
|
|
|
|
|
|
|
|
|
|
err = 0;
|
|
|
|
|
lock_sock(sk);
|
|
|
|
|
|
|
|
|
|
switch (optname) {
|
2007-03-09 12:44:43 +08:00
|
|
|
case IP_OPTIONS:
|
|
|
|
|
{
|
|
|
|
|
struct ip_options * opt = NULL;
|
|
|
|
|
if (optlen > 40 || optlen < 0)
|
|
|
|
|
goto e_inval;
|
2008-03-26 01:26:21 +08:00
|
|
|
err = ip_options_get_from_user(sock_net(sk), &opt,
|
2008-03-25 06:31:00 +08:00
|
|
|
optval, optlen);
|
2007-03-09 12:44:43 +08:00
|
|
|
if (err)
|
|
|
|
|
break;
|
|
|
|
|
if (inet->is_icsk) {
|
|
|
|
|
struct inet_connection_sock *icsk = inet_csk(sk);
|
2005-04-17 06:20:36 +08:00
|
|
|
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
|
2007-03-09 12:44:43 +08:00
|
|
|
if (sk->sk_family == PF_INET ||
|
|
|
|
|
(!((1 << sk->sk_state) &
|
|
|
|
|
(TCPF_LISTEN | TCPF_CLOSE)) &&
|
|
|
|
|
inet->daddr != LOOPBACK4_IPV6)) {
|
2005-04-17 06:20:36 +08:00
|
|
|
#endif
|
2007-03-09 12:44:43 +08:00
|
|
|
if (inet->opt)
|
|
|
|
|
icsk->icsk_ext_hdr_len -= inet->opt->optlen;
|
|
|
|
|
if (opt)
|
|
|
|
|
icsk->icsk_ext_hdr_len += opt->optlen;
|
|
|
|
|
icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
|
2005-04-17 06:20:36 +08:00
|
|
|
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
|
|
|
|
|
}
|
2007-03-09 12:44:43 +08:00
|
|
|
#endif
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
2007-03-09 12:44:43 +08:00
|
|
|
opt = xchg(&inet->opt, opt);
|
|
|
|
|
kfree(opt);
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
case IP_PKTINFO:
|
|
|
|
|
if (val)
|
|
|
|
|
inet->cmsg_flags |= IP_CMSG_PKTINFO;
|
|
|
|
|
else
|
|
|
|
|
inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
|
|
|
|
|
break;
|
|
|
|
|
case IP_RECVTTL:
|
|
|
|
|
if (val)
|
|
|
|
|
inet->cmsg_flags |= IP_CMSG_TTL;
|
|
|
|
|
else
|
|
|
|
|
inet->cmsg_flags &= ~IP_CMSG_TTL;
|
|
|
|
|
break;
|
|
|
|
|
case IP_RECVTOS:
|
|
|
|
|
if (val)
|
|
|
|
|
inet->cmsg_flags |= IP_CMSG_TOS;
|
|
|
|
|
else
|
|
|
|
|
inet->cmsg_flags &= ~IP_CMSG_TOS;
|
|
|
|
|
break;
|
|
|
|
|
case IP_RECVOPTS:
|
|
|
|
|
if (val)
|
|
|
|
|
inet->cmsg_flags |= IP_CMSG_RECVOPTS;
|
|
|
|
|
else
|
|
|
|
|
inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
|
|
|
|
|
break;
|
|
|
|
|
case IP_RETOPTS:
|
|
|
|
|
if (val)
|
|
|
|
|
inet->cmsg_flags |= IP_CMSG_RETOPTS;
|
|
|
|
|
else
|
|
|
|
|
inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
|
|
|
|
|
break;
|
|
|
|
|
case IP_PASSSEC:
|
|
|
|
|
if (val)
|
|
|
|
|
inet->cmsg_flags |= IP_CMSG_PASSSEC;
|
|
|
|
|
else
|
|
|
|
|
inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
|
|
|
|
|
break;
|
|
|
|
|
case IP_TOS: /* This sets both TOS and Precedence */
|
|
|
|
|
if (sk->sk_type == SOCK_STREAM) {
|
|
|
|
|
val &= ~3;
|
|
|
|
|
val |= inet->tos & 3;
|
|
|
|
|
}
|
|
|
|
|
if (inet->tos != val) {
|
|
|
|
|
inet->tos = val;
|
|
|
|
|
sk->sk_priority = rt_tos2priority(val);
|
|
|
|
|
sk_dst_reset(sk);
|
|
|
|
|
}
|
|
|
|
|
break;
|
|
|
|
|
case IP_TTL:
|
|
|
|
|
if (optlen<1)
|
|
|
|
|
goto e_inval;
|
|
|
|
|
if (val != -1 && (val < 1 || val>255))
|
|
|
|
|
goto e_inval;
|
|
|
|
|
inet->uc_ttl = val;
|
|
|
|
|
break;
|
|
|
|
|
case IP_HDRINCL:
|
|
|
|
|
if (sk->sk_type != SOCK_RAW) {
|
|
|
|
|
err = -ENOPROTOOPT;
|
[SECURITY]: TCP/UDP getpeersec
This patch implements an application of the LSM-IPSec networking
controls whereby an application can determine the label of the
security association its TCP or UDP sockets are currently connected to
via getsockopt and the auxiliary data mechanism of recvmsg.
Patch purpose:
This patch enables a security-aware application to retrieve the
security context of an IPSec security association a particular TCP or
UDP socket is using. The application can then use this security
context to determine the security context for processing on behalf of
the peer at the other end of this connection. In the case of UDP, the
security context is for each individual packet. An example
application is the inetd daemon, which could be modified to start
daemons running at security contexts dependent on the remote client.
Patch design approach:
- Design for TCP
The patch enables the SELinux LSM to set the peer security context for
a socket based on the security context of the IPSec security
association. The application may retrieve this context using
getsockopt. When called, the kernel determines if the socket is a
connected (TCP_ESTABLISHED) TCP socket and, if so, uses the dst_entry
cache on the socket to retrieve the security associations. If a
security association has a security context, the context string is
returned, as for UNIX domain sockets.
- Design for UDP
Unlike TCP, UDP is connectionless. This requires a somewhat different
API to retrieve the peer security context. With TCP, the peer
security context stays the same throughout the connection, thus it can
be retrieved at any time between when the connection is established
and when it is torn down. With UDP, each read/write can have
different peer and thus the security context might change every time.
As a result the security context retrieval must be done TOGETHER with
the packet retrieval.
The solution is to build upon the existing Unix domain socket API for
retrieving user credentials. Linux offers the API for obtaining user
credentials via ancillary messages (i.e., out of band/control messages
that are bundled together with a normal message).
Patch implementation details:
- Implementation for TCP
The security context can be retrieved by applications using getsockopt
with the existing SO_PEERSEC flag. As an example (ignoring error
checking):
getsockopt(sockfd, SOL_SOCKET, SO_PEERSEC, optbuf, &optlen);
printf("Socket peer context is: %s\n", optbuf);
The SELinux function, selinux_socket_getpeersec, is extended to check
for labeled security associations for connected (TCP_ESTABLISHED ==
sk->sk_state) TCP sockets only. If so, the socket has a dst_cache of
struct dst_entry values that may refer to security associations. If
these have security associations with security contexts, the security
context is returned.
getsockopt returns a buffer that contains a security context string or
the buffer is unmodified.
- Implementation for UDP
To retrieve the security context, the application first indicates to
the kernel such desire by setting the IP_PASSSEC option via
getsockopt. Then the application retrieves the security context using
the auxiliary data mechanism.
An example server application for UDP should look like this:
toggle = 1;
toggle_len = sizeof(toggle);
setsockopt(sockfd, SOL_IP, IP_PASSSEC, &toggle, &toggle_len);
recvmsg(sockfd, &msg_hdr, 0);
if (msg_hdr.msg_controllen > sizeof(struct cmsghdr)) {
cmsg_hdr = CMSG_FIRSTHDR(&msg_hdr);
if (cmsg_hdr->cmsg_len <= CMSG_LEN(sizeof(scontext)) &&
cmsg_hdr->cmsg_level == SOL_IP &&
cmsg_hdr->cmsg_type == SCM_SECURITY) {
memcpy(&scontext, CMSG_DATA(cmsg_hdr), sizeof(scontext));
}
}
ip_setsockopt is enhanced with a new socket option IP_PASSSEC to allow
a server socket to receive security context of the peer. A new
ancillary message type SCM_SECURITY.
When the packet is received we get the security context from the
sec_path pointer which is contained in the sk_buff, and copy it to the
ancillary message space. An additional LSM hook,
selinux_socket_getpeersec_udp, is defined to retrieve the security
context from the SELinux space. The existing function,
selinux_socket_getpeersec does not suit our purpose, because the
security context is copied directly to user space, rather than to
kernel space.
Testing:
We have tested the patch by setting up TCP and UDP connections between
applications on two machines using the IPSec policies that result in
labeled security associations being built. For TCP, we can then
extract the peer security context using getsockopt on either end. For
UDP, the receiving end can retrieve the security context using the
auxiliary data mechanism of recvmsg.
Signed-off-by: Catherine Zhang <cxzhang@watson.ibm.com>
Acked-by: James Morris <jmorris@namei.org>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-21 14:41:23 +08:00
|
|
|
break;
|
2007-03-09 12:44:43 +08:00
|
|
|
}
|
|
|
|
|
inet->hdrincl = val ? 1 : 0;
|
|
|
|
|
break;
|
|
|
|
|
case IP_MTU_DISCOVER:
|
2007-04-21 06:53:27 +08:00
|
|
|
if (val<0 || val>3)
|
2007-03-09 12:44:43 +08:00
|
|
|
goto e_inval;
|
|
|
|
|
inet->pmtudisc = val;
|
|
|
|
|
break;
|
|
|
|
|
case IP_RECVERR:
|
|
|
|
|
inet->recverr = !!val;
|
|
|
|
|
if (!val)
|
|
|
|
|
skb_queue_purge(&sk->sk_error_queue);
|
|
|
|
|
break;
|
|
|
|
|
case IP_MULTICAST_TTL:
|
|
|
|
|
if (sk->sk_type == SOCK_STREAM)
|
|
|
|
|
goto e_inval;
|
|
|
|
|
if (optlen<1)
|
|
|
|
|
goto e_inval;
|
|
|
|
|
if (val==-1)
|
|
|
|
|
val = 1;
|
|
|
|
|
if (val < 0 || val > 255)
|
|
|
|
|
goto e_inval;
|
|
|
|
|
inet->mc_ttl = val;
|
|
|
|
|
break;
|
|
|
|
|
case IP_MULTICAST_LOOP:
|
|
|
|
|
if (optlen<1)
|
|
|
|
|
goto e_inval;
|
|
|
|
|
inet->mc_loop = !!val;
|
|
|
|
|
break;
|
|
|
|
|
case IP_MULTICAST_IF:
|
|
|
|
|
{
|
|
|
|
|
struct ip_mreqn mreq;
|
|
|
|
|
struct net_device *dev = NULL;
|
|
|
|
|
|
|
|
|
|
if (sk->sk_type == SOCK_STREAM)
|
|
|
|
|
goto e_inval;
|
|
|
|
|
/*
|
|
|
|
|
* Check the arguments are allowable
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
err = -EFAULT;
|
|
|
|
|
if (optlen >= sizeof(struct ip_mreqn)) {
|
|
|
|
|
if (copy_from_user(&mreq,optval,sizeof(mreq)))
|
2005-04-17 06:20:36 +08:00
|
|
|
break;
|
2007-03-09 12:44:43 +08:00
|
|
|
} else {
|
|
|
|
|
memset(&mreq, 0, sizeof(mreq));
|
|
|
|
|
if (optlen >= sizeof(struct in_addr) &&
|
|
|
|
|
copy_from_user(&mreq.imr_address,optval,sizeof(struct in_addr)))
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (!mreq.imr_ifindex) {
|
2008-03-18 13:44:53 +08:00
|
|
|
if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
|
2007-03-09 12:44:43 +08:00
|
|
|
inet->mc_index = 0;
|
|
|
|
|
inet->mc_addr = 0;
|
|
|
|
|
err = 0;
|
2005-04-17 06:20:36 +08:00
|
|
|
break;
|
|
|
|
|
}
|
2008-03-26 01:26:21 +08:00
|
|
|
dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
|
2007-03-09 12:44:43 +08:00
|
|
|
if (dev) {
|
|
|
|
|
mreq.imr_ifindex = dev->ifindex;
|
|
|
|
|
dev_put(dev);
|
|
|
|
|
}
|
|
|
|
|
} else
|
2008-03-26 01:26:21 +08:00
|
|
|
dev = __dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
|
|
2007-03-09 12:44:43 +08:00
|
|
|
err = -EADDRNOTAVAIL;
|
|
|
|
|
if (!dev)
|
|
|
|
|
break;
|
|
|
|
|
|
|
|
|
|
err = -EINVAL;
|
|
|
|
|
if (sk->sk_bound_dev_if &&
|
|
|
|
|
mreq.imr_ifindex != sk->sk_bound_dev_if)
|
|
|
|
|
break;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2007-03-09 12:44:43 +08:00
|
|
|
inet->mc_index = mreq.imr_ifindex;
|
|
|
|
|
inet->mc_addr = mreq.imr_address.s_addr;
|
|
|
|
|
err = 0;
|
|
|
|
|
break;
|
|
|
|
|
}
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2007-03-09 12:44:43 +08:00
|
|
|
case IP_ADD_MEMBERSHIP:
|
|
|
|
|
case IP_DROP_MEMBERSHIP:
|
|
|
|
|
{
|
|
|
|
|
struct ip_mreqn mreq;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2007-08-25 13:16:39 +08:00
|
|
|
err = -EPROTO;
|
|
|
|
|
if (inet_sk(sk)->is_icsk)
|
|
|
|
|
break;
|
|
|
|
|
|
2007-03-09 12:44:43 +08:00
|
|
|
if (optlen < sizeof(struct ip_mreq))
|
|
|
|
|
goto e_inval;
|
|
|
|
|
err = -EFAULT;
|
|
|
|
|
if (optlen >= sizeof(struct ip_mreqn)) {
|
|
|
|
|
if (copy_from_user(&mreq,optval,sizeof(mreq)))
|
2005-04-17 06:20:36 +08:00
|
|
|
break;
|
2007-03-09 12:44:43 +08:00
|
|
|
} else {
|
|
|
|
|
memset(&mreq, 0, sizeof(mreq));
|
|
|
|
|
if (copy_from_user(&mreq,optval,sizeof(struct ip_mreq)))
|
2005-04-17 06:20:36 +08:00
|
|
|
break;
|
2007-03-09 12:44:43 +08:00
|
|
|
}
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2007-03-09 12:44:43 +08:00
|
|
|
if (optname == IP_ADD_MEMBERSHIP)
|
|
|
|
|
err = ip_mc_join_group(sk, &mreq);
|
|
|
|
|
else
|
|
|
|
|
err = ip_mc_leave_group(sk, &mreq);
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
case IP_MSFILTER:
|
|
|
|
|
{
|
|
|
|
|
extern int sysctl_igmp_max_msf;
|
|
|
|
|
struct ip_msfilter *msf;
|
|
|
|
|
|
|
|
|
|
if (optlen < IP_MSFILTER_SIZE(0))
|
|
|
|
|
goto e_inval;
|
|
|
|
|
if (optlen > sysctl_optmem_max) {
|
|
|
|
|
err = -ENOBUFS;
|
2005-04-17 06:20:36 +08:00
|
|
|
break;
|
|
|
|
|
}
|
2007-03-09 12:44:43 +08:00
|
|
|
msf = kmalloc(optlen, GFP_KERNEL);
|
2007-10-09 16:59:42 +08:00
|
|
|
if (!msf) {
|
2007-03-09 12:44:43 +08:00
|
|
|
err = -ENOBUFS;
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
err = -EFAULT;
|
|
|
|
|
if (copy_from_user(msf, optval, optlen)) {
|
|
|
|
|
kfree(msf);
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
/* numsrc >= (1G-4) overflow in 32 bits */
|
|
|
|
|
if (msf->imsf_numsrc >= 0x3ffffffcU ||
|
|
|
|
|
msf->imsf_numsrc > sysctl_igmp_max_msf) {
|
|
|
|
|
kfree(msf);
|
|
|
|
|
err = -ENOBUFS;
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
|
|
|
|
|
kfree(msf);
|
|
|
|
|
err = -EINVAL;
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
err = ip_mc_msfilter(sk, msf, 0);
|
|
|
|
|
kfree(msf);
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
case IP_BLOCK_SOURCE:
|
|
|
|
|
case IP_UNBLOCK_SOURCE:
|
|
|
|
|
case IP_ADD_SOURCE_MEMBERSHIP:
|
|
|
|
|
case IP_DROP_SOURCE_MEMBERSHIP:
|
|
|
|
|
{
|
|
|
|
|
struct ip_mreq_source mreqs;
|
|
|
|
|
int omode, add;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2007-03-09 12:44:43 +08:00
|
|
|
if (optlen != sizeof(struct ip_mreq_source))
|
|
|
|
|
goto e_inval;
|
|
|
|
|
if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
|
2005-04-17 06:20:36 +08:00
|
|
|
err = -EFAULT;
|
|
|
|
|
break;
|
|
|
|
|
}
|
2007-03-09 12:44:43 +08:00
|
|
|
if (optname == IP_BLOCK_SOURCE) {
|
|
|
|
|
omode = MCAST_EXCLUDE;
|
|
|
|
|
add = 1;
|
|
|
|
|
} else if (optname == IP_UNBLOCK_SOURCE) {
|
|
|
|
|
omode = MCAST_EXCLUDE;
|
|
|
|
|
add = 0;
|
|
|
|
|
} else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
|
|
|
|
|
struct ip_mreqn mreq;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2007-03-09 12:44:43 +08:00
|
|
|
mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
|
|
|
|
|
mreq.imr_address.s_addr = mreqs.imr_interface;
|
|
|
|
|
mreq.imr_ifindex = 0;
|
|
|
|
|
err = ip_mc_join_group(sk, &mreq);
|
|
|
|
|
if (err && err != -EADDRINUSE)
|
2005-04-17 06:20:36 +08:00
|
|
|
break;
|
2007-03-09 12:44:43 +08:00
|
|
|
omode = MCAST_INCLUDE;
|
|
|
|
|
add = 1;
|
|
|
|
|
} else /* IP_DROP_SOURCE_MEMBERSHIP */ {
|
|
|
|
|
omode = MCAST_INCLUDE;
|
|
|
|
|
add = 0;
|
|
|
|
|
}
|
|
|
|
|
err = ip_mc_source(add, omode, sk, &mreqs, 0);
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
case MCAST_JOIN_GROUP:
|
|
|
|
|
case MCAST_LEAVE_GROUP:
|
|
|
|
|
{
|
|
|
|
|
struct group_req greq;
|
|
|
|
|
struct sockaddr_in *psin;
|
|
|
|
|
struct ip_mreqn mreq;
|
|
|
|
|
|
|
|
|
|
if (optlen < sizeof(struct group_req))
|
|
|
|
|
goto e_inval;
|
|
|
|
|
err = -EFAULT;
|
|
|
|
|
if (copy_from_user(&greq, optval, sizeof(greq)))
|
|
|
|
|
break;
|
|
|
|
|
psin = (struct sockaddr_in *)&greq.gr_group;
|
|
|
|
|
if (psin->sin_family != AF_INET)
|
|
|
|
|
goto e_inval;
|
|
|
|
|
memset(&mreq, 0, sizeof(mreq));
|
|
|
|
|
mreq.imr_multiaddr = psin->sin_addr;
|
|
|
|
|
mreq.imr_ifindex = greq.gr_interface;
|
|
|
|
|
|
|
|
|
|
if (optname == MCAST_JOIN_GROUP)
|
|
|
|
|
err = ip_mc_join_group(sk, &mreq);
|
|
|
|
|
else
|
|
|
|
|
err = ip_mc_leave_group(sk, &mreq);
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
case MCAST_JOIN_SOURCE_GROUP:
|
|
|
|
|
case MCAST_LEAVE_SOURCE_GROUP:
|
|
|
|
|
case MCAST_BLOCK_SOURCE:
|
|
|
|
|
case MCAST_UNBLOCK_SOURCE:
|
|
|
|
|
{
|
|
|
|
|
struct group_source_req greqs;
|
|
|
|
|
struct ip_mreq_source mreqs;
|
|
|
|
|
struct sockaddr_in *psin;
|
|
|
|
|
int omode, add;
|
|
|
|
|
|
|
|
|
|
if (optlen != sizeof(struct group_source_req))
|
|
|
|
|
goto e_inval;
|
|
|
|
|
if (copy_from_user(&greqs, optval, sizeof(greqs))) {
|
2005-04-17 06:20:36 +08:00
|
|
|
err = -EFAULT;
|
|
|
|
|
break;
|
|
|
|
|
}
|
2007-03-09 12:44:43 +08:00
|
|
|
if (greqs.gsr_group.ss_family != AF_INET ||
|
|
|
|
|
greqs.gsr_source.ss_family != AF_INET) {
|
|
|
|
|
err = -EADDRNOTAVAIL;
|
2005-04-17 06:20:36 +08:00
|
|
|
break;
|
|
|
|
|
}
|
2007-03-09 12:44:43 +08:00
|
|
|
psin = (struct sockaddr_in *)&greqs.gsr_group;
|
|
|
|
|
mreqs.imr_multiaddr = psin->sin_addr.s_addr;
|
|
|
|
|
psin = (struct sockaddr_in *)&greqs.gsr_source;
|
|
|
|
|
mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
|
|
|
|
|
mreqs.imr_interface = 0; /* use index for mc_source */
|
|
|
|
|
|
|
|
|
|
if (optname == MCAST_BLOCK_SOURCE) {
|
|
|
|
|
omode = MCAST_EXCLUDE;
|
|
|
|
|
add = 1;
|
|
|
|
|
} else if (optname == MCAST_UNBLOCK_SOURCE) {
|
|
|
|
|
omode = MCAST_EXCLUDE;
|
|
|
|
|
add = 0;
|
|
|
|
|
} else if (optname == MCAST_JOIN_SOURCE_GROUP) {
|
2005-04-17 06:20:36 +08:00
|
|
|
struct ip_mreqn mreq;
|
|
|
|
|
|
2007-03-09 12:44:43 +08:00
|
|
|
psin = (struct sockaddr_in *)&greqs.gsr_group;
|
2005-04-17 06:20:36 +08:00
|
|
|
mreq.imr_multiaddr = psin->sin_addr;
|
2007-03-09 12:44:43 +08:00
|
|
|
mreq.imr_address.s_addr = 0;
|
|
|
|
|
mreq.imr_ifindex = greqs.gsr_interface;
|
|
|
|
|
err = ip_mc_join_group(sk, &mreq);
|
|
|
|
|
if (err && err != -EADDRINUSE)
|
|
|
|
|
break;
|
|
|
|
|
greqs.gsr_interface = mreq.imr_ifindex;
|
|
|
|
|
omode = MCAST_INCLUDE;
|
|
|
|
|
add = 1;
|
|
|
|
|
} else /* MCAST_LEAVE_SOURCE_GROUP */ {
|
|
|
|
|
omode = MCAST_INCLUDE;
|
|
|
|
|
add = 0;
|
|
|
|
|
}
|
|
|
|
|
err = ip_mc_source(add, omode, sk, &mreqs,
|
|
|
|
|
greqs.gsr_interface);
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
case MCAST_MSFILTER:
|
|
|
|
|
{
|
|
|
|
|
extern int sysctl_igmp_max_msf;
|
|
|
|
|
struct sockaddr_in *psin;
|
|
|
|
|
struct ip_msfilter *msf = NULL;
|
|
|
|
|
struct group_filter *gsf = NULL;
|
|
|
|
|
int msize, i, ifindex;
|
|
|
|
|
|
|
|
|
|
if (optlen < GROUP_FILTER_SIZE(0))
|
|
|
|
|
goto e_inval;
|
|
|
|
|
if (optlen > sysctl_optmem_max) {
|
|
|
|
|
err = -ENOBUFS;
|
2005-04-17 06:20:36 +08:00
|
|
|
break;
|
|
|
|
|
}
|
2007-03-09 12:44:43 +08:00
|
|
|
gsf = kmalloc(optlen,GFP_KERNEL);
|
2007-10-09 16:59:42 +08:00
|
|
|
if (!gsf) {
|
2007-03-09 12:44:43 +08:00
|
|
|
err = -ENOBUFS;
|
2005-04-17 06:20:36 +08:00
|
|
|
break;
|
|
|
|
|
}
|
2007-03-09 12:44:43 +08:00
|
|
|
err = -EFAULT;
|
|
|
|
|
if (copy_from_user(gsf, optval, optlen)) {
|
|
|
|
|
goto mc_msf_out;
|
|
|
|
|
}
|
|
|
|
|
/* numsrc >= (4G-140)/128 overflow in 32 bits */
|
|
|
|
|
if (gsf->gf_numsrc >= 0x1ffffff ||
|
|
|
|
|
gsf->gf_numsrc > sysctl_igmp_max_msf) {
|
|
|
|
|
err = -ENOBUFS;
|
|
|
|
|
goto mc_msf_out;
|
|
|
|
|
}
|
|
|
|
|
if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
|
|
|
|
|
err = -EINVAL;
|
|
|
|
|
goto mc_msf_out;
|
|
|
|
|
}
|
|
|
|
|
msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
|
|
|
|
|
msf = kmalloc(msize,GFP_KERNEL);
|
2007-10-09 16:59:42 +08:00
|
|
|
if (!msf) {
|
2007-03-09 12:44:43 +08:00
|
|
|
err = -ENOBUFS;
|
|
|
|
|
goto mc_msf_out;
|
|
|
|
|
}
|
|
|
|
|
ifindex = gsf->gf_interface;
|
|
|
|
|
psin = (struct sockaddr_in *)&gsf->gf_group;
|
|
|
|
|
if (psin->sin_family != AF_INET) {
|
2005-04-17 06:20:36 +08:00
|
|
|
err = -EADDRNOTAVAIL;
|
2007-03-09 12:44:43 +08:00
|
|
|
goto mc_msf_out;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
2007-03-09 12:44:43 +08:00
|
|
|
msf->imsf_multiaddr = psin->sin_addr.s_addr;
|
|
|
|
|
msf->imsf_interface = 0;
|
|
|
|
|
msf->imsf_fmode = gsf->gf_fmode;
|
|
|
|
|
msf->imsf_numsrc = gsf->gf_numsrc;
|
|
|
|
|
err = -EADDRNOTAVAIL;
|
|
|
|
|
for (i=0; i<gsf->gf_numsrc; ++i) {
|
|
|
|
|
psin = (struct sockaddr_in *)&gsf->gf_slist[i];
|
2007-02-09 22:24:47 +08:00
|
|
|
|
2007-03-09 12:44:43 +08:00
|
|
|
if (psin->sin_family != AF_INET)
|
|
|
|
|
goto mc_msf_out;
|
|
|
|
|
msf->imsf_slist[i] = psin->sin_addr.s_addr;
|
|
|
|
|
}
|
|
|
|
|
kfree(gsf);
|
|
|
|
|
gsf = NULL;
|
|
|
|
|
|
|
|
|
|
err = ip_mc_msfilter(sk, msf, ifindex);
|
|
|
|
|
mc_msf_out:
|
|
|
|
|
kfree(msf);
|
|
|
|
|
kfree(gsf);
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
case IP_ROUTER_ALERT:
|
|
|
|
|
err = ip_ra_control(sk, val ? 1 : 0, NULL);
|
|
|
|
|
break;
|
|
|
|
|
|
|
|
|
|
case IP_FREEBIND:
|
|
|
|
|
if (optlen<1)
|
|
|
|
|
goto e_inval;
|
|
|
|
|
inet->freebind = !!val;
|
|
|
|
|
break;
|
|
|
|
|
|
|
|
|
|
case IP_IPSEC_POLICY:
|
|
|
|
|
case IP_XFRM_POLICY:
|
|
|
|
|
err = -EPERM;
|
|
|
|
|
if (!capable(CAP_NET_ADMIN))
|
2005-04-17 06:20:36 +08:00
|
|
|
break;
|
2007-03-09 12:44:43 +08:00
|
|
|
err = xfrm_user_policy(sk, optname, optval, optlen);
|
|
|
|
|
break;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2008-10-01 22:30:02 +08:00
|
|
|
case IP_TRANSPARENT:
|
|
|
|
|
if (!capable(CAP_NET_ADMIN)) {
|
|
|
|
|
err = -EPERM;
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
if (optlen < 1)
|
|
|
|
|
goto e_inval;
|
|
|
|
|
inet->transparent = !!val;
|
|
|
|
|
break;
|
|
|
|
|
|
2007-03-09 12:44:43 +08:00
|
|
|
default:
|
|
|
|
|
err = -ENOPROTOOPT;
|
|
|
|
|
break;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
release_sock(sk);
|
|
|
|
|
return err;
|
|
|
|
|
|
|
|
|
|
e_inval:
|
|
|
|
|
release_sock(sk);
|
|
|
|
|
return -EINVAL;
|
|
|
|
|
}
|
|
|
|
|
|
2006-03-21 14:45:21 +08:00
|
|
|
int ip_setsockopt(struct sock *sk, int level,
|
|
|
|
|
int optname, char __user *optval, int optlen)
|
|
|
|
|
{
|
|
|
|
|
int err;
|
|
|
|
|
|
|
|
|
|
if (level != SOL_IP)
|
|
|
|
|
return -ENOPROTOOPT;
|
|
|
|
|
|
|
|
|
|
err = do_ip_setsockopt(sk, level, optname, optval, optlen);
|
|
|
|
|
#ifdef CONFIG_NETFILTER
|
|
|
|
|
/* we need to exclude all possible ENOPROTOOPTs except default case */
|
|
|
|
|
if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
|
2007-11-06 13:32:31 +08:00
|
|
|
optname != IP_IPSEC_POLICY &&
|
|
|
|
|
optname != IP_XFRM_POLICY &&
|
|
|
|
|
!ip_mroute_opt(optname)) {
|
2006-03-21 14:45:21 +08:00
|
|
|
lock_sock(sk);
|
|
|
|
|
err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
|
|
|
|
|
release_sock(sk);
|
|
|
|
|
}
|
|
|
|
|
#endif
|
|
|
|
|
return err;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
#ifdef CONFIG_COMPAT
|
2006-03-21 14:48:35 +08:00
|
|
|
int compat_ip_setsockopt(struct sock *sk, int level, int optname,
|
|
|
|
|
char __user *optval, int optlen)
|
2006-03-21 14:45:21 +08:00
|
|
|
{
|
|
|
|
|
int err;
|
|
|
|
|
|
|
|
|
|
if (level != SOL_IP)
|
|
|
|
|
return -ENOPROTOOPT;
|
|
|
|
|
|
2008-04-27 16:06:07 +08:00
|
|
|
if (optname >= MCAST_JOIN_GROUP && optname <= MCAST_MSFILTER)
|
|
|
|
|
return compat_mc_setsockopt(sk, level, optname, optval, optlen,
|
|
|
|
|
ip_setsockopt);
|
|
|
|
|
|
2006-03-21 14:45:21 +08:00
|
|
|
err = do_ip_setsockopt(sk, level, optname, optval, optlen);
|
|
|
|
|
#ifdef CONFIG_NETFILTER
|
|
|
|
|
/* we need to exclude all possible ENOPROTOOPTs except default case */
|
|
|
|
|
if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
|
2007-11-06 13:32:31 +08:00
|
|
|
optname != IP_IPSEC_POLICY &&
|
|
|
|
|
optname != IP_XFRM_POLICY &&
|
|
|
|
|
!ip_mroute_opt(optname)) {
|
2006-03-21 14:45:21 +08:00
|
|
|
lock_sock(sk);
|
2006-03-21 14:48:35 +08:00
|
|
|
err = compat_nf_setsockopt(sk, PF_INET, optname,
|
|
|
|
|
optval, optlen);
|
2006-03-21 14:45:21 +08:00
|
|
|
release_sock(sk);
|
|
|
|
|
}
|
|
|
|
|
#endif
|
|
|
|
|
return err;
|
|
|
|
|
}
|
2006-03-21 14:48:35 +08:00
|
|
|
|
|
|
|
|
EXPORT_SYMBOL(compat_ip_setsockopt);
|
2006-03-21 14:45:21 +08:00
|
|
|
#endif
|
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
/*
|
|
|
|
|
* Get the options. Note for future reference. The GET of IP options gets the
|
|
|
|
|
* _received_ ones. The set sets the _sent_ ones.
|
|
|
|
|
*/
|
|
|
|
|
|
2006-03-21 14:45:21 +08:00
|
|
|
static int do_ip_getsockopt(struct sock *sk, int level, int optname,
|
2007-03-09 12:44:43 +08:00
|
|
|
char __user *optval, int __user *optlen)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
|
|
|
int val;
|
|
|
|
|
int len;
|
2007-02-09 22:24:47 +08:00
|
|
|
|
2007-03-09 12:44:43 +08:00
|
|
|
if (level != SOL_IP)
|
2005-04-17 06:20:36 +08:00
|
|
|
return -EOPNOTSUPP;
|
|
|
|
|
|
2007-11-06 13:32:31 +08:00
|
|
|
if (ip_mroute_opt(optname))
|
2005-04-17 06:20:36 +08:00
|
|
|
return ip_mroute_getsockopt(sk,optname,optval,optlen);
|
|
|
|
|
|
2007-03-09 12:44:43 +08:00
|
|
|
if (get_user(len,optlen))
|
2005-04-17 06:20:36 +08:00
|
|
|
return -EFAULT;
|
2007-03-09 12:44:43 +08:00
|
|
|
if (len < 0)
|
2005-04-17 06:20:36 +08:00
|
|
|
return -EINVAL;
|
2007-02-09 22:24:47 +08:00
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
lock_sock(sk);
|
|
|
|
|
|
2007-03-09 12:44:43 +08:00
|
|
|
switch (optname) {
|
|
|
|
|
case IP_OPTIONS:
|
|
|
|
|
{
|
|
|
|
|
unsigned char optbuf[sizeof(struct ip_options)+40];
|
|
|
|
|
struct ip_options * opt = (struct ip_options*)optbuf;
|
|
|
|
|
opt->optlen = 0;
|
|
|
|
|
if (inet->opt)
|
|
|
|
|
memcpy(optbuf, inet->opt,
|
|
|
|
|
sizeof(struct ip_options)+
|
|
|
|
|
inet->opt->optlen);
|
|
|
|
|
release_sock(sk);
|
|
|
|
|
|
|
|
|
|
if (opt->optlen == 0)
|
|
|
|
|
return put_user(0, optlen);
|
|
|
|
|
|
|
|
|
|
ip_options_undo(opt);
|
|
|
|
|
|
|
|
|
|
len = min_t(unsigned int, len, opt->optlen);
|
|
|
|
|
if (put_user(len, optlen))
|
|
|
|
|
return -EFAULT;
|
|
|
|
|
if (copy_to_user(optval, opt->__data, len))
|
|
|
|
|
return -EFAULT;
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
case IP_PKTINFO:
|
|
|
|
|
val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
|
|
|
|
|
break;
|
|
|
|
|
case IP_RECVTTL:
|
|
|
|
|
val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
|
|
|
|
|
break;
|
|
|
|
|
case IP_RECVTOS:
|
|
|
|
|
val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
|
|
|
|
|
break;
|
|
|
|
|
case IP_RECVOPTS:
|
|
|
|
|
val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
|
|
|
|
|
break;
|
|
|
|
|
case IP_RETOPTS:
|
|
|
|
|
val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
|
|
|
|
|
break;
|
|
|
|
|
case IP_PASSSEC:
|
|
|
|
|
val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
|
|
|
|
|
break;
|
|
|
|
|
case IP_TOS:
|
|
|
|
|
val = inet->tos;
|
|
|
|
|
break;
|
|
|
|
|
case IP_TTL:
|
|
|
|
|
val = (inet->uc_ttl == -1 ?
|
|
|
|
|
sysctl_ip_default_ttl :
|
|
|
|
|
inet->uc_ttl);
|
|
|
|
|
break;
|
|
|
|
|
case IP_HDRINCL:
|
|
|
|
|
val = inet->hdrincl;
|
|
|
|
|
break;
|
|
|
|
|
case IP_MTU_DISCOVER:
|
|
|
|
|
val = inet->pmtudisc;
|
|
|
|
|
break;
|
|
|
|
|
case IP_MTU:
|
|
|
|
|
{
|
|
|
|
|
struct dst_entry *dst;
|
|
|
|
|
val = 0;
|
|
|
|
|
dst = sk_dst_get(sk);
|
|
|
|
|
if (dst) {
|
|
|
|
|
val = dst_mtu(dst);
|
|
|
|
|
dst_release(dst);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
2007-03-09 12:44:43 +08:00
|
|
|
if (!val) {
|
2005-04-17 06:20:36 +08:00
|
|
|
release_sock(sk);
|
2007-03-09 12:44:43 +08:00
|
|
|
return -ENOTCONN;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
2007-03-09 12:44:43 +08:00
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
case IP_RECVERR:
|
|
|
|
|
val = inet->recverr;
|
|
|
|
|
break;
|
|
|
|
|
case IP_MULTICAST_TTL:
|
|
|
|
|
val = inet->mc_ttl;
|
|
|
|
|
break;
|
|
|
|
|
case IP_MULTICAST_LOOP:
|
|
|
|
|
val = inet->mc_loop;
|
|
|
|
|
break;
|
|
|
|
|
case IP_MULTICAST_IF:
|
|
|
|
|
{
|
|
|
|
|
struct in_addr addr;
|
|
|
|
|
len = min_t(unsigned int, len, sizeof(struct in_addr));
|
|
|
|
|
addr.s_addr = inet->mc_addr;
|
|
|
|
|
release_sock(sk);
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2007-03-09 12:44:43 +08:00
|
|
|
if (put_user(len, optlen))
|
|
|
|
|
return -EFAULT;
|
|
|
|
|
if (copy_to_user(optval, &addr, len))
|
|
|
|
|
return -EFAULT;
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
case IP_MSFILTER:
|
|
|
|
|
{
|
|
|
|
|
struct ip_msfilter msf;
|
|
|
|
|
int err;
|
|
|
|
|
|
|
|
|
|
if (len < IP_MSFILTER_SIZE(0)) {
|
2005-04-17 06:20:36 +08:00
|
|
|
release_sock(sk);
|
2007-03-09 12:44:43 +08:00
|
|
|
return -EINVAL;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
2007-03-09 12:44:43 +08:00
|
|
|
if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
|
2005-04-17 06:20:36 +08:00
|
|
|
release_sock(sk);
|
2007-03-09 12:44:43 +08:00
|
|
|
return -EFAULT;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
2007-03-09 12:44:43 +08:00
|
|
|
err = ip_mc_msfget(sk, &msf,
|
|
|
|
|
(struct ip_msfilter __user *)optval, optlen);
|
|
|
|
|
release_sock(sk);
|
|
|
|
|
return err;
|
|
|
|
|
}
|
|
|
|
|
case MCAST_MSFILTER:
|
|
|
|
|
{
|
|
|
|
|
struct group_filter gsf;
|
|
|
|
|
int err;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2007-03-09 12:44:43 +08:00
|
|
|
if (len < GROUP_FILTER_SIZE(0)) {
|
2005-04-17 06:20:36 +08:00
|
|
|
release_sock(sk);
|
2007-03-09 12:44:43 +08:00
|
|
|
return -EINVAL;
|
|
|
|
|
}
|
|
|
|
|
if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
|
|
|
|
|
release_sock(sk);
|
|
|
|
|
return -EFAULT;
|
|
|
|
|
}
|
|
|
|
|
err = ip_mc_gsfget(sk, &gsf,
|
|
|
|
|
(struct group_filter __user *)optval, optlen);
|
|
|
|
|
release_sock(sk);
|
|
|
|
|
return err;
|
|
|
|
|
}
|
|
|
|
|
case IP_PKTOPTIONS:
|
|
|
|
|
{
|
|
|
|
|
struct msghdr msg;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2007-03-09 12:44:43 +08:00
|
|
|
release_sock(sk);
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2007-03-09 12:44:43 +08:00
|
|
|
if (sk->sk_type != SOCK_STREAM)
|
|
|
|
|
return -ENOPROTOOPT;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2007-03-09 12:44:43 +08:00
|
|
|
msg.msg_control = optval;
|
|
|
|
|
msg.msg_controllen = len;
|
|
|
|
|
msg.msg_flags = 0;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2007-03-09 12:44:43 +08:00
|
|
|
if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
|
|
|
|
|
struct in_pktinfo info;
|
|
|
|
|
|
|
|
|
|
info.ipi_addr.s_addr = inet->rcv_saddr;
|
|
|
|
|
info.ipi_spec_dst.s_addr = inet->rcv_saddr;
|
|
|
|
|
info.ipi_ifindex = inet->mc_index;
|
|
|
|
|
put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
2007-03-09 12:44:43 +08:00
|
|
|
if (inet->cmsg_flags & IP_CMSG_TTL) {
|
|
|
|
|
int hlim = inet->mc_ttl;
|
|
|
|
|
put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
|
|
|
|
|
}
|
|
|
|
|
len -= msg.msg_controllen;
|
|
|
|
|
return put_user(len, optlen);
|
|
|
|
|
}
|
|
|
|
|
case IP_FREEBIND:
|
|
|
|
|
val = inet->freebind;
|
|
|
|
|
break;
|
2008-10-01 22:30:02 +08:00
|
|
|
case IP_TRANSPARENT:
|
|
|
|
|
val = inet->transparent;
|
|
|
|
|
break;
|
2007-03-09 12:44:43 +08:00
|
|
|
default:
|
|
|
|
|
release_sock(sk);
|
|
|
|
|
return -ENOPROTOOPT;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
release_sock(sk);
|
2007-02-09 22:24:47 +08:00
|
|
|
|
[IPV4]: Fix byte value boundary check in do_ip_getsockopt().
This fixes kernel bugzilla 10371.
As reported by M.Piechaczek@osmosys.tv, if we try to grab a
char sized socket option value, as in:
unsigned char ttl = 255;
socklen_t len = sizeof(ttl);
setsockopt(socket, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, &len);
getsockopt(socket, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, &len);
The ttl returned will be wrong on big-endian, and on both little-
endian and big-endian the next three bytes in userspace are written
with garbage.
It's because of this test in do_ip_getsockopt():
if (len < sizeof(int) && len > 0 && val>=0 && val<255) {
It should allow a 'val' of 255 to pass here, but it doesn't so it
copies a full 'int' back to userspace.
On little-endian that will write the correct value into the location
but it spams on the next three bytes in userspace. On big endian it
writes the wrong value into the location and spams the next three
bytes.
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-04-10 16:29:36 +08:00
|
|
|
if (len < sizeof(int) && len > 0 && val>=0 && val<=255) {
|
2005-04-17 06:20:36 +08:00
|
|
|
unsigned char ucval = (unsigned char)val;
|
|
|
|
|
len = 1;
|
2007-03-09 12:44:43 +08:00
|
|
|
if (put_user(len, optlen))
|
2005-04-17 06:20:36 +08:00
|
|
|
return -EFAULT;
|
2007-03-09 12:44:43 +08:00
|
|
|
if (copy_to_user(optval,&ucval,1))
|
2005-04-17 06:20:36 +08:00
|
|
|
return -EFAULT;
|
|
|
|
|
} else {
|
|
|
|
|
len = min_t(unsigned int, sizeof(int), len);
|
2007-03-09 12:44:43 +08:00
|
|
|
if (put_user(len, optlen))
|
2005-04-17 06:20:36 +08:00
|
|
|
return -EFAULT;
|
2007-03-09 12:44:43 +08:00
|
|
|
if (copy_to_user(optval,&val,len))
|
2005-04-17 06:20:36 +08:00
|
|
|
return -EFAULT;
|
|
|
|
|
}
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
2006-03-21 14:45:21 +08:00
|
|
|
int ip_getsockopt(struct sock *sk, int level,
|
2007-03-09 12:44:43 +08:00
|
|
|
int optname, char __user *optval, int __user *optlen)
|
2006-03-21 14:45:21 +08:00
|
|
|
{
|
|
|
|
|
int err;
|
|
|
|
|
|
|
|
|
|
err = do_ip_getsockopt(sk, level, optname, optval, optlen);
|
|
|
|
|
#ifdef CONFIG_NETFILTER
|
|
|
|
|
/* we need to exclude all possible ENOPROTOOPTs except default case */
|
2007-11-06 13:32:31 +08:00
|
|
|
if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
|
|
|
|
|
!ip_mroute_opt(optname)) {
|
2007-02-09 22:24:47 +08:00
|
|
|
int len;
|
2006-03-21 14:45:21 +08:00
|
|
|
|
2007-03-09 12:44:43 +08:00
|
|
|
if (get_user(len,optlen))
|
2006-03-21 14:45:21 +08:00
|
|
|
return -EFAULT;
|
|
|
|
|
|
|
|
|
|
lock_sock(sk);
|
|
|
|
|
err = nf_getsockopt(sk, PF_INET, optname, optval,
|
|
|
|
|
&len);
|
|
|
|
|
release_sock(sk);
|
|
|
|
|
if (err >= 0)
|
|
|
|
|
err = put_user(len, optlen);
|
|
|
|
|
return err;
|
|
|
|
|
}
|
|
|
|
|
#endif
|
|
|
|
|
return err;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
#ifdef CONFIG_COMPAT
|
2006-03-21 14:48:35 +08:00
|
|
|
int compat_ip_getsockopt(struct sock *sk, int level, int optname,
|
|
|
|
|
char __user *optval, int __user *optlen)
|
2006-03-21 14:45:21 +08:00
|
|
|
{
|
2008-04-29 18:23:22 +08:00
|
|
|
int err;
|
|
|
|
|
|
|
|
|
|
if (optname == MCAST_MSFILTER)
|
|
|
|
|
return compat_mc_getsockopt(sk, level, optname, optval, optlen,
|
|
|
|
|
ip_getsockopt);
|
|
|
|
|
|
|
|
|
|
err = do_ip_getsockopt(sk, level, optname, optval, optlen);
|
|
|
|
|
|
2006-03-21 14:45:21 +08:00
|
|
|
#ifdef CONFIG_NETFILTER
|
|
|
|
|
/* we need to exclude all possible ENOPROTOOPTs except default case */
|
2007-11-06 13:32:31 +08:00
|
|
|
if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
|
|
|
|
|
!ip_mroute_opt(optname)) {
|
2007-02-09 22:24:47 +08:00
|
|
|
int len;
|
2006-03-21 14:45:21 +08:00
|
|
|
|
2006-03-21 14:48:35 +08:00
|
|
|
if (get_user(len, optlen))
|
2006-03-21 14:45:21 +08:00
|
|
|
return -EFAULT;
|
|
|
|
|
|
|
|
|
|
lock_sock(sk);
|
2006-03-21 14:48:35 +08:00
|
|
|
err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
|
2006-03-21 14:45:21 +08:00
|
|
|
release_sock(sk);
|
|
|
|
|
if (err >= 0)
|
|
|
|
|
err = put_user(len, optlen);
|
|
|
|
|
return err;
|
|
|
|
|
}
|
|
|
|
|
#endif
|
|
|
|
|
return err;
|
|
|
|
|
}
|
2006-03-21 14:48:35 +08:00
|
|
|
|
|
|
|
|
EXPORT_SYMBOL(compat_ip_getsockopt);
|
2006-03-21 14:45:21 +08:00
|
|
|
#endif
|
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
EXPORT_SYMBOL(ip_cmsg_recv);
|
|
|
|
|
|
|
|
|
|
EXPORT_SYMBOL(ip_getsockopt);
|
|
|
|
|
EXPORT_SYMBOL(ip_setsockopt);
|