![Lukas Bulwahn](/assets/img/avatar_default.png)
For IPV6_2292PKTOPTIONS, do_ipv6_getsockopt() stores the user pointer
optval in the msg_control field of the msghdr.
Hence, sparse rightfully warns at ./net/ipv6/ipv6_sockglue.c:1151:33:
warning: incorrect type in assignment (different address spaces)
expected void *msg_control
got char [noderef] __user *optval
Since commit 1f466e1f15
("net: cleanly handle kernel vs user buffers for
->msg_control"), user pointers shall be stored in the msg_control_user
field, and kernel pointers in the msg_control field. This allows to
propagate __user annotations nicely through this struct.
Store optval in msg_control_user to properly record and propagate the
memory space annotation of this pointer.
Note that msg_control_is_user is set to true, so the key invariant, i.e.,
use msg_control_user if and only if msg_control_is_user is true, holds.
The msghdr is further used in the six alternative put_cmsg() calls, with
msg_control_is_user being true, put_cmsg() picks msg_control_user
preserving the __user annotation and passes that properly to
copy_to_user().
No functional change. No change in object code.
Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20201127093421.21673-1-lukas.bulwahn@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
1494 lines
32 KiB
C
1494 lines
32 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* IPv6 BSD socket options interface
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* Linux INET6 implementation
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*
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* Authors:
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* Pedro Roque <roque@di.fc.ul.pt>
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*
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* Based on linux/net/ipv4/ip_sockglue.c
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*
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* FIXME: Make the setsockopt code POSIX compliant: That is
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*
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* o Truncate getsockopt returns
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* o Return an optlen of the truncated length if need be
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*
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* Changes:
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* David L Stevens <dlstevens@us.ibm.com>:
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* - added multicast source filtering API for MLDv2
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*/
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#include <linux/module.h>
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#include <linux/capability.h>
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/socket.h>
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#include <linux/sockios.h>
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#include <linux/net.h>
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#include <linux/in6.h>
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#include <linux/mroute6.h>
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#include <linux/netdevice.h>
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#include <linux/if_arp.h>
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#include <linux/init.h>
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#include <linux/sysctl.h>
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#include <linux/netfilter.h>
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#include <linux/slab.h>
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#include <net/sock.h>
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#include <net/snmp.h>
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#include <net/ipv6.h>
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#include <net/ndisc.h>
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#include <net/protocol.h>
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#include <net/transp_v6.h>
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#include <net/ip6_route.h>
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#include <net/addrconf.h>
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#include <net/inet_common.h>
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#include <net/tcp.h>
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#include <net/udp.h>
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#include <net/udplite.h>
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#include <net/xfrm.h>
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#include <net/compat.h>
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#include <net/seg6.h>
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#include <linux/uaccess.h>
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struct ip6_ra_chain *ip6_ra_chain;
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DEFINE_RWLOCK(ip6_ra_lock);
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int ip6_ra_control(struct sock *sk, int sel)
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{
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struct ip6_ra_chain *ra, *new_ra, **rap;
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/* RA packet may be delivered ONLY to IPPROTO_RAW socket */
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if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num != IPPROTO_RAW)
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return -ENOPROTOOPT;
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new_ra = (sel >= 0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
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if (sel >= 0 && !new_ra)
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return -ENOMEM;
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write_lock_bh(&ip6_ra_lock);
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for (rap = &ip6_ra_chain; (ra = *rap) != NULL; rap = &ra->next) {
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if (ra->sk == sk) {
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if (sel >= 0) {
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write_unlock_bh(&ip6_ra_lock);
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kfree(new_ra);
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return -EADDRINUSE;
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}
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*rap = ra->next;
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write_unlock_bh(&ip6_ra_lock);
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sock_put(sk);
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kfree(ra);
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return 0;
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}
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}
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if (!new_ra) {
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write_unlock_bh(&ip6_ra_lock);
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return -ENOBUFS;
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}
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new_ra->sk = sk;
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new_ra->sel = sel;
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new_ra->next = ra;
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*rap = new_ra;
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sock_hold(sk);
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write_unlock_bh(&ip6_ra_lock);
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return 0;
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}
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struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
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struct ipv6_txoptions *opt)
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{
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if (inet_sk(sk)->is_icsk) {
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if (opt &&
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!((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
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inet_sk(sk)->inet_daddr != LOOPBACK4_IPV6) {
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struct inet_connection_sock *icsk = inet_csk(sk);
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icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen;
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icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
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}
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}
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opt = xchg((__force struct ipv6_txoptions **)&inet6_sk(sk)->opt,
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opt);
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sk_dst_reset(sk);
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return opt;
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}
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static bool setsockopt_needs_rtnl(int optname)
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{
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switch (optname) {
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case IPV6_ADDRFORM:
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case IPV6_ADD_MEMBERSHIP:
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case IPV6_DROP_MEMBERSHIP:
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case IPV6_JOIN_ANYCAST:
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case IPV6_LEAVE_ANYCAST:
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case MCAST_JOIN_GROUP:
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case MCAST_LEAVE_GROUP:
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case MCAST_JOIN_SOURCE_GROUP:
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case MCAST_LEAVE_SOURCE_GROUP:
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case MCAST_BLOCK_SOURCE:
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case MCAST_UNBLOCK_SOURCE:
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case MCAST_MSFILTER:
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return true;
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}
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return false;
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}
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static int copy_group_source_from_sockptr(struct group_source_req *greqs,
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sockptr_t optval, int optlen)
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{
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if (in_compat_syscall()) {
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struct compat_group_source_req gr32;
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if (optlen < sizeof(gr32))
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return -EINVAL;
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if (copy_from_sockptr(&gr32, optval, sizeof(gr32)))
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return -EFAULT;
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greqs->gsr_interface = gr32.gsr_interface;
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greqs->gsr_group = gr32.gsr_group;
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greqs->gsr_source = gr32.gsr_source;
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} else {
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if (optlen < sizeof(*greqs))
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return -EINVAL;
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if (copy_from_sockptr(greqs, optval, sizeof(*greqs)))
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return -EFAULT;
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}
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return 0;
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}
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static int do_ipv6_mcast_group_source(struct sock *sk, int optname,
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sockptr_t optval, int optlen)
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{
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struct group_source_req greqs;
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int omode, add;
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int ret;
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ret = copy_group_source_from_sockptr(&greqs, optval, optlen);
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if (ret)
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return ret;
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if (greqs.gsr_group.ss_family != AF_INET6 ||
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greqs.gsr_source.ss_family != AF_INET6)
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return -EADDRNOTAVAIL;
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if (optname == MCAST_BLOCK_SOURCE) {
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omode = MCAST_EXCLUDE;
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add = 1;
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} else if (optname == MCAST_UNBLOCK_SOURCE) {
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omode = MCAST_EXCLUDE;
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add = 0;
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} else if (optname == MCAST_JOIN_SOURCE_GROUP) {
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struct sockaddr_in6 *psin6;
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int retv;
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psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
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retv = ipv6_sock_mc_join_ssm(sk, greqs.gsr_interface,
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&psin6->sin6_addr,
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MCAST_INCLUDE);
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/* prior join w/ different source is ok */
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if (retv && retv != -EADDRINUSE)
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return retv;
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omode = MCAST_INCLUDE;
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add = 1;
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} else /* MCAST_LEAVE_SOURCE_GROUP */ {
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omode = MCAST_INCLUDE;
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add = 0;
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}
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return ip6_mc_source(add, omode, sk, &greqs);
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}
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static int ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval,
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int optlen)
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{
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struct group_filter *gsf;
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int ret;
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if (optlen < GROUP_FILTER_SIZE(0))
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return -EINVAL;
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if (optlen > sysctl_optmem_max)
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return -ENOBUFS;
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gsf = memdup_sockptr(optval, optlen);
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if (IS_ERR(gsf))
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return PTR_ERR(gsf);
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/* numsrc >= (4G-140)/128 overflow in 32 bits */
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ret = -ENOBUFS;
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if (gsf->gf_numsrc >= 0x1ffffffU ||
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gsf->gf_numsrc > sysctl_mld_max_msf)
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goto out_free_gsf;
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ret = -EINVAL;
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if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen)
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goto out_free_gsf;
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ret = ip6_mc_msfilter(sk, gsf, gsf->gf_slist);
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out_free_gsf:
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kfree(gsf);
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return ret;
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}
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static int compat_ipv6_set_mcast_msfilter(struct sock *sk, sockptr_t optval,
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int optlen)
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{
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const int size0 = offsetof(struct compat_group_filter, gf_slist);
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struct compat_group_filter *gf32;
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void *p;
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int ret;
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int n;
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if (optlen < size0)
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return -EINVAL;
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if (optlen > sysctl_optmem_max - 4)
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return -ENOBUFS;
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p = kmalloc(optlen + 4, GFP_KERNEL);
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if (!p)
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return -ENOMEM;
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gf32 = p + 4; /* we want ->gf_group and ->gf_slist aligned */
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ret = -EFAULT;
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if (copy_from_sockptr(gf32, optval, optlen))
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goto out_free_p;
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/* numsrc >= (4G-140)/128 overflow in 32 bits */
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ret = -ENOBUFS;
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n = gf32->gf_numsrc;
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if (n >= 0x1ffffffU || n > sysctl_mld_max_msf)
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goto out_free_p;
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ret = -EINVAL;
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if (offsetof(struct compat_group_filter, gf_slist[n]) > optlen)
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goto out_free_p;
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ret = ip6_mc_msfilter(sk, &(struct group_filter){
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.gf_interface = gf32->gf_interface,
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.gf_group = gf32->gf_group,
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.gf_fmode = gf32->gf_fmode,
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.gf_numsrc = gf32->gf_numsrc}, gf32->gf_slist);
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out_free_p:
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kfree(p);
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return ret;
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}
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static int ipv6_mcast_join_leave(struct sock *sk, int optname,
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sockptr_t optval, int optlen)
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{
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struct sockaddr_in6 *psin6;
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struct group_req greq;
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if (optlen < sizeof(greq))
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return -EINVAL;
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if (copy_from_sockptr(&greq, optval, sizeof(greq)))
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return -EFAULT;
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if (greq.gr_group.ss_family != AF_INET6)
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return -EADDRNOTAVAIL;
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psin6 = (struct sockaddr_in6 *)&greq.gr_group;
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if (optname == MCAST_JOIN_GROUP)
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return ipv6_sock_mc_join(sk, greq.gr_interface,
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&psin6->sin6_addr);
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return ipv6_sock_mc_drop(sk, greq.gr_interface, &psin6->sin6_addr);
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}
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static int compat_ipv6_mcast_join_leave(struct sock *sk, int optname,
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sockptr_t optval, int optlen)
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{
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struct compat_group_req gr32;
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struct sockaddr_in6 *psin6;
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if (optlen < sizeof(gr32))
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return -EINVAL;
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if (copy_from_sockptr(&gr32, optval, sizeof(gr32)))
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return -EFAULT;
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if (gr32.gr_group.ss_family != AF_INET6)
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return -EADDRNOTAVAIL;
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psin6 = (struct sockaddr_in6 *)&gr32.gr_group;
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if (optname == MCAST_JOIN_GROUP)
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return ipv6_sock_mc_join(sk, gr32.gr_interface,
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&psin6->sin6_addr);
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return ipv6_sock_mc_drop(sk, gr32.gr_interface, &psin6->sin6_addr);
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}
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static int ipv6_set_opt_hdr(struct sock *sk, int optname, sockptr_t optval,
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int optlen)
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{
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struct ipv6_pinfo *np = inet6_sk(sk);
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struct ipv6_opt_hdr *new = NULL;
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struct net *net = sock_net(sk);
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struct ipv6_txoptions *opt;
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int err;
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/* hop-by-hop / destination options are privileged option */
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if (optname != IPV6_RTHDR && !ns_capable(net->user_ns, CAP_NET_RAW))
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return -EPERM;
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/* remove any sticky options header with a zero option
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* length, per RFC3542.
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*/
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if (optlen > 0) {
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if (sockptr_is_null(optval))
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return -EINVAL;
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if (optlen < sizeof(struct ipv6_opt_hdr) ||
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optlen & 0x7 ||
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optlen > 8 * 255)
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return -EINVAL;
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new = memdup_sockptr(optval, optlen);
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if (IS_ERR(new))
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return PTR_ERR(new);
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if (unlikely(ipv6_optlen(new) > optlen)) {
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kfree(new);
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return -EINVAL;
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}
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}
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opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk));
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opt = ipv6_renew_options(sk, opt, optname, new);
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kfree(new);
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if (IS_ERR(opt))
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return PTR_ERR(opt);
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/* routing header option needs extra check */
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err = -EINVAL;
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if (optname == IPV6_RTHDR && opt && opt->srcrt) {
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struct ipv6_rt_hdr *rthdr = opt->srcrt;
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switch (rthdr->type) {
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#if IS_ENABLED(CONFIG_IPV6_MIP6)
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case IPV6_SRCRT_TYPE_2:
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if (rthdr->hdrlen != 2 || rthdr->segments_left != 1)
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goto sticky_done;
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break;
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#endif
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case IPV6_SRCRT_TYPE_4:
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{
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struct ipv6_sr_hdr *srh =
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(struct ipv6_sr_hdr *)opt->srcrt;
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if (!seg6_validate_srh(srh, optlen, false))
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goto sticky_done;
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break;
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}
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default:
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goto sticky_done;
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}
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}
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|
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err = 0;
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opt = ipv6_update_options(sk, opt);
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sticky_done:
|
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if (opt) {
|
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atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
|
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txopt_put(opt);
|
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}
|
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return err;
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}
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|
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static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
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sockptr_t optval, unsigned int optlen)
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{
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struct ipv6_pinfo *np = inet6_sk(sk);
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struct net *net = sock_net(sk);
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int val, valbool;
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int retv = -ENOPROTOOPT;
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bool needs_rtnl = setsockopt_needs_rtnl(optname);
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|
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if (sockptr_is_null(optval))
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val = 0;
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else {
|
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if (optlen >= sizeof(int)) {
|
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if (copy_from_sockptr(&val, optval, sizeof(val)))
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return -EFAULT;
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|
} else
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val = 0;
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|
}
|
|
|
|
valbool = (val != 0);
|
|
|
|
if (ip6_mroute_opt(optname))
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return ip6_mroute_setsockopt(sk, optname, optval, optlen);
|
|
|
|
if (needs_rtnl)
|
|
rtnl_lock();
|
|
lock_sock(sk);
|
|
|
|
switch (optname) {
|
|
|
|
case IPV6_ADDRFORM:
|
|
if (optlen < sizeof(int))
|
|
goto e_inval;
|
|
if (val == PF_INET) {
|
|
struct ipv6_txoptions *opt;
|
|
struct sk_buff *pktopt;
|
|
|
|
if (sk->sk_type == SOCK_RAW)
|
|
break;
|
|
|
|
if (sk->sk_protocol == IPPROTO_UDP ||
|
|
sk->sk_protocol == IPPROTO_UDPLITE) {
|
|
struct udp_sock *up = udp_sk(sk);
|
|
if (up->pending == AF_INET6) {
|
|
retv = -EBUSY;
|
|
break;
|
|
}
|
|
} else if (sk->sk_protocol == IPPROTO_TCP) {
|
|
if (sk->sk_prot != &tcpv6_prot) {
|
|
retv = -EBUSY;
|
|
break;
|
|
}
|
|
} else {
|
|
break;
|
|
}
|
|
|
|
if (sk->sk_state != TCP_ESTABLISHED) {
|
|
retv = -ENOTCONN;
|
|
break;
|
|
}
|
|
|
|
if (ipv6_only_sock(sk) ||
|
|
!ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
|
|
retv = -EADDRNOTAVAIL;
|
|
break;
|
|
}
|
|
|
|
fl6_free_socklist(sk);
|
|
__ipv6_sock_mc_close(sk);
|
|
__ipv6_sock_ac_close(sk);
|
|
|
|
/*
|
|
* Sock is moving from IPv6 to IPv4 (sk_prot), so
|
|
* remove it from the refcnt debug socks count in the
|
|
* original family...
|
|
*/
|
|
sk_refcnt_debug_dec(sk);
|
|
|
|
if (sk->sk_protocol == IPPROTO_TCP) {
|
|
struct inet_connection_sock *icsk = inet_csk(sk);
|
|
local_bh_disable();
|
|
sock_prot_inuse_add(net, sk->sk_prot, -1);
|
|
sock_prot_inuse_add(net, &tcp_prot, 1);
|
|
local_bh_enable();
|
|
sk->sk_prot = &tcp_prot;
|
|
icsk->icsk_af_ops = &ipv4_specific;
|
|
sk->sk_socket->ops = &inet_stream_ops;
|
|
sk->sk_family = PF_INET;
|
|
tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
|
|
} else {
|
|
struct proto *prot = &udp_prot;
|
|
|
|
if (sk->sk_protocol == IPPROTO_UDPLITE)
|
|
prot = &udplite_prot;
|
|
local_bh_disable();
|
|
sock_prot_inuse_add(net, sk->sk_prot, -1);
|
|
sock_prot_inuse_add(net, prot, 1);
|
|
local_bh_enable();
|
|
sk->sk_prot = prot;
|
|
sk->sk_socket->ops = &inet_dgram_ops;
|
|
sk->sk_family = PF_INET;
|
|
}
|
|
opt = xchg((__force struct ipv6_txoptions **)&np->opt,
|
|
NULL);
|
|
if (opt) {
|
|
atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
|
|
txopt_put(opt);
|
|
}
|
|
pktopt = xchg(&np->pktoptions, NULL);
|
|
kfree_skb(pktopt);
|
|
|
|
/*
|
|
* ... and add it to the refcnt debug socks count
|
|
* in the new family. -acme
|
|
*/
|
|
sk_refcnt_debug_inc(sk);
|
|
module_put(THIS_MODULE);
|
|
retv = 0;
|
|
break;
|
|
}
|
|
goto e_inval;
|
|
|
|
case IPV6_V6ONLY:
|
|
if (optlen < sizeof(int) ||
|
|
inet_sk(sk)->inet_num)
|
|
goto e_inval;
|
|
sk->sk_ipv6only = valbool;
|
|
retv = 0;
|
|
break;
|
|
|
|
case IPV6_RECVPKTINFO:
|
|
if (optlen < sizeof(int))
|
|
goto e_inval;
|
|
np->rxopt.bits.rxinfo = valbool;
|
|
retv = 0;
|
|
break;
|
|
|
|
case IPV6_2292PKTINFO:
|
|
if (optlen < sizeof(int))
|
|
goto e_inval;
|
|
np->rxopt.bits.rxoinfo = valbool;
|
|
retv = 0;
|
|
break;
|
|
|
|
case IPV6_RECVHOPLIMIT:
|
|
if (optlen < sizeof(int))
|
|
goto e_inval;
|
|
np->rxopt.bits.rxhlim = valbool;
|
|
retv = 0;
|
|
break;
|
|
|
|
case IPV6_2292HOPLIMIT:
|
|
if (optlen < sizeof(int))
|
|
goto e_inval;
|
|
np->rxopt.bits.rxohlim = valbool;
|
|
retv = 0;
|
|
break;
|
|
|
|
case IPV6_RECVRTHDR:
|
|
if (optlen < sizeof(int))
|
|
goto e_inval;
|
|
np->rxopt.bits.srcrt = valbool;
|
|
retv = 0;
|
|
break;
|
|
|
|
case IPV6_2292RTHDR:
|
|
if (optlen < sizeof(int))
|
|
goto e_inval;
|
|
np->rxopt.bits.osrcrt = valbool;
|
|
retv = 0;
|
|
break;
|
|
|
|
case IPV6_RECVHOPOPTS:
|
|
if (optlen < sizeof(int))
|
|
goto e_inval;
|
|
np->rxopt.bits.hopopts = valbool;
|
|
retv = 0;
|
|
break;
|
|
|
|
case IPV6_2292HOPOPTS:
|
|
if (optlen < sizeof(int))
|
|
goto e_inval;
|
|
np->rxopt.bits.ohopopts = valbool;
|
|
retv = 0;
|
|
break;
|
|
|
|
case IPV6_RECVDSTOPTS:
|
|
if (optlen < sizeof(int))
|
|
goto e_inval;
|
|
np->rxopt.bits.dstopts = valbool;
|
|
retv = 0;
|
|
break;
|
|
|
|
case IPV6_2292DSTOPTS:
|
|
if (optlen < sizeof(int))
|
|
goto e_inval;
|
|
np->rxopt.bits.odstopts = valbool;
|
|
retv = 0;
|
|
break;
|
|
|
|
case IPV6_TCLASS:
|
|
if (optlen < sizeof(int))
|
|
goto e_inval;
|
|
if (val < -1 || val > 0xff)
|
|
goto e_inval;
|
|
/* RFC 3542, 6.5: default traffic class of 0x0 */
|
|
if (val == -1)
|
|
val = 0;
|
|
np->tclass = val;
|
|
retv = 0;
|
|
break;
|
|
|
|
case IPV6_RECVTCLASS:
|
|
if (optlen < sizeof(int))
|
|
goto e_inval;
|
|
np->rxopt.bits.rxtclass = valbool;
|
|
retv = 0;
|
|
break;
|
|
|
|
case IPV6_FLOWINFO:
|
|
if (optlen < sizeof(int))
|
|
goto e_inval;
|
|
np->rxopt.bits.rxflow = valbool;
|
|
retv = 0;
|
|
break;
|
|
|
|
case IPV6_RECVPATHMTU:
|
|
if (optlen < sizeof(int))
|
|
goto e_inval;
|
|
np->rxopt.bits.rxpmtu = valbool;
|
|
retv = 0;
|
|
break;
|
|
|
|
case IPV6_TRANSPARENT:
|
|
if (valbool && !ns_capable(net->user_ns, CAP_NET_RAW) &&
|
|
!ns_capable(net->user_ns, CAP_NET_ADMIN)) {
|
|
retv = -EPERM;
|
|
break;
|
|
}
|
|
if (optlen < sizeof(int))
|
|
goto e_inval;
|
|
/* we don't have a separate transparent bit for IPV6 we use the one in the IPv4 socket */
|
|
inet_sk(sk)->transparent = valbool;
|
|
retv = 0;
|
|
break;
|
|
|
|
case IPV6_FREEBIND:
|
|
if (optlen < sizeof(int))
|
|
goto e_inval;
|
|
/* we also don't have a separate freebind bit for IPV6 */
|
|
inet_sk(sk)->freebind = valbool;
|
|
retv = 0;
|
|
break;
|
|
|
|
case IPV6_RECVORIGDSTADDR:
|
|
if (optlen < sizeof(int))
|
|
goto e_inval;
|
|
np->rxopt.bits.rxorigdstaddr = valbool;
|
|
retv = 0;
|
|
break;
|
|
|
|
case IPV6_HOPOPTS:
|
|
case IPV6_RTHDRDSTOPTS:
|
|
case IPV6_RTHDR:
|
|
case IPV6_DSTOPTS:
|
|
retv = ipv6_set_opt_hdr(sk, optname, optval, optlen);
|
|
break;
|
|
|
|
case IPV6_PKTINFO:
|
|
{
|
|
struct in6_pktinfo pkt;
|
|
|
|
if (optlen == 0)
|
|
goto e_inval;
|
|
else if (optlen < sizeof(struct in6_pktinfo) ||
|
|
sockptr_is_null(optval))
|
|
goto e_inval;
|
|
|
|
if (copy_from_sockptr(&pkt, optval, sizeof(pkt))) {
|
|
retv = -EFAULT;
|
|
break;
|
|
}
|
|
if (!sk_dev_equal_l3scope(sk, pkt.ipi6_ifindex))
|
|
goto e_inval;
|
|
|
|
np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
|
|
np->sticky_pktinfo.ipi6_addr = pkt.ipi6_addr;
|
|
retv = 0;
|
|
break;
|
|
}
|
|
|
|
case IPV6_2292PKTOPTIONS:
|
|
{
|
|
struct ipv6_txoptions *opt = NULL;
|
|
struct msghdr msg;
|
|
struct flowi6 fl6;
|
|
struct ipcm6_cookie ipc6;
|
|
|
|
memset(&fl6, 0, sizeof(fl6));
|
|
fl6.flowi6_oif = sk->sk_bound_dev_if;
|
|
fl6.flowi6_mark = sk->sk_mark;
|
|
|
|
if (optlen == 0)
|
|
goto update;
|
|
|
|
/* 1K is probably excessive
|
|
* 1K is surely not enough, 2K per standard header is 16K.
|
|
*/
|
|
retv = -EINVAL;
|
|
if (optlen > 64*1024)
|
|
break;
|
|
|
|
opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
|
|
retv = -ENOBUFS;
|
|
if (!opt)
|
|
break;
|
|
|
|
memset(opt, 0, sizeof(*opt));
|
|
refcount_set(&opt->refcnt, 1);
|
|
opt->tot_len = sizeof(*opt) + optlen;
|
|
retv = -EFAULT;
|
|
if (copy_from_sockptr(opt + 1, optval, optlen))
|
|
goto done;
|
|
|
|
msg.msg_controllen = optlen;
|
|
msg.msg_control = (void *)(opt+1);
|
|
ipc6.opt = opt;
|
|
|
|
retv = ip6_datagram_send_ctl(net, sk, &msg, &fl6, &ipc6);
|
|
if (retv)
|
|
goto done;
|
|
update:
|
|
retv = 0;
|
|
opt = ipv6_update_options(sk, opt);
|
|
done:
|
|
if (opt) {
|
|
atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
|
|
txopt_put(opt);
|
|
}
|
|
break;
|
|
}
|
|
case IPV6_UNICAST_HOPS:
|
|
if (optlen < sizeof(int))
|
|
goto e_inval;
|
|
if (val > 255 || val < -1)
|
|
goto e_inval;
|
|
np->hop_limit = val;
|
|
retv = 0;
|
|
break;
|
|
|
|
case IPV6_MULTICAST_HOPS:
|
|
if (sk->sk_type == SOCK_STREAM)
|
|
break;
|
|
if (optlen < sizeof(int))
|
|
goto e_inval;
|
|
if (val > 255 || val < -1)
|
|
goto e_inval;
|
|
np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
|
|
retv = 0;
|
|
break;
|
|
|
|
case IPV6_MULTICAST_LOOP:
|
|
if (optlen < sizeof(int))
|
|
goto e_inval;
|
|
if (val != valbool)
|
|
goto e_inval;
|
|
np->mc_loop = valbool;
|
|
retv = 0;
|
|
break;
|
|
|
|
case IPV6_UNICAST_IF:
|
|
{
|
|
struct net_device *dev = NULL;
|
|
int ifindex;
|
|
|
|
if (optlen != sizeof(int))
|
|
goto e_inval;
|
|
|
|
ifindex = (__force int)ntohl((__force __be32)val);
|
|
if (ifindex == 0) {
|
|
np->ucast_oif = 0;
|
|
retv = 0;
|
|
break;
|
|
}
|
|
|
|
dev = dev_get_by_index(net, ifindex);
|
|
retv = -EADDRNOTAVAIL;
|
|
if (!dev)
|
|
break;
|
|
dev_put(dev);
|
|
|
|
retv = -EINVAL;
|
|
if (sk->sk_bound_dev_if)
|
|
break;
|
|
|
|
np->ucast_oif = ifindex;
|
|
retv = 0;
|
|
break;
|
|
}
|
|
|
|
case IPV6_MULTICAST_IF:
|
|
if (sk->sk_type == SOCK_STREAM)
|
|
break;
|
|
if (optlen < sizeof(int))
|
|
goto e_inval;
|
|
|
|
if (val) {
|
|
struct net_device *dev;
|
|
int midx;
|
|
|
|
rcu_read_lock();
|
|
|
|
dev = dev_get_by_index_rcu(net, val);
|
|
if (!dev) {
|
|
rcu_read_unlock();
|
|
retv = -ENODEV;
|
|
break;
|
|
}
|
|
midx = l3mdev_master_ifindex_rcu(dev);
|
|
|
|
rcu_read_unlock();
|
|
|
|
if (sk->sk_bound_dev_if &&
|
|
sk->sk_bound_dev_if != val &&
|
|
(!midx || midx != sk->sk_bound_dev_if))
|
|
goto e_inval;
|
|
}
|
|
np->mcast_oif = val;
|
|
retv = 0;
|
|
break;
|
|
case IPV6_ADD_MEMBERSHIP:
|
|
case IPV6_DROP_MEMBERSHIP:
|
|
{
|
|
struct ipv6_mreq mreq;
|
|
|
|
if (optlen < sizeof(struct ipv6_mreq))
|
|
goto e_inval;
|
|
|
|
retv = -EPROTO;
|
|
if (inet_sk(sk)->is_icsk)
|
|
break;
|
|
|
|
retv = -EFAULT;
|
|
if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq)))
|
|
break;
|
|
|
|
if (optname == IPV6_ADD_MEMBERSHIP)
|
|
retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
|
|
else
|
|
retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
|
|
break;
|
|
}
|
|
case IPV6_JOIN_ANYCAST:
|
|
case IPV6_LEAVE_ANYCAST:
|
|
{
|
|
struct ipv6_mreq mreq;
|
|
|
|
if (optlen < sizeof(struct ipv6_mreq))
|
|
goto e_inval;
|
|
|
|
retv = -EFAULT;
|
|
if (copy_from_sockptr(&mreq, optval, sizeof(struct ipv6_mreq)))
|
|
break;
|
|
|
|
if (optname == IPV6_JOIN_ANYCAST)
|
|
retv = ipv6_sock_ac_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
|
|
else
|
|
retv = ipv6_sock_ac_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_acaddr);
|
|
break;
|
|
}
|
|
case IPV6_MULTICAST_ALL:
|
|
if (optlen < sizeof(int))
|
|
goto e_inval;
|
|
np->mc_all = valbool;
|
|
retv = 0;
|
|
break;
|
|
|
|
case MCAST_JOIN_GROUP:
|
|
case MCAST_LEAVE_GROUP:
|
|
if (in_compat_syscall())
|
|
retv = compat_ipv6_mcast_join_leave(sk, optname, optval,
|
|
optlen);
|
|
else
|
|
retv = ipv6_mcast_join_leave(sk, optname, optval,
|
|
optlen);
|
|
break;
|
|
case MCAST_JOIN_SOURCE_GROUP:
|
|
case MCAST_LEAVE_SOURCE_GROUP:
|
|
case MCAST_BLOCK_SOURCE:
|
|
case MCAST_UNBLOCK_SOURCE:
|
|
retv = do_ipv6_mcast_group_source(sk, optname, optval, optlen);
|
|
break;
|
|
case MCAST_MSFILTER:
|
|
if (in_compat_syscall())
|
|
retv = compat_ipv6_set_mcast_msfilter(sk, optval,
|
|
optlen);
|
|
else
|
|
retv = ipv6_set_mcast_msfilter(sk, optval, optlen);
|
|
break;
|
|
case IPV6_ROUTER_ALERT:
|
|
if (optlen < sizeof(int))
|
|
goto e_inval;
|
|
retv = ip6_ra_control(sk, val);
|
|
break;
|
|
case IPV6_ROUTER_ALERT_ISOLATE:
|
|
if (optlen < sizeof(int))
|
|
goto e_inval;
|
|
np->rtalert_isolate = valbool;
|
|
retv = 0;
|
|
break;
|
|
case IPV6_MTU_DISCOVER:
|
|
if (optlen < sizeof(int))
|
|
goto e_inval;
|
|
if (val < IPV6_PMTUDISC_DONT || val > IPV6_PMTUDISC_OMIT)
|
|
goto e_inval;
|
|
np->pmtudisc = val;
|
|
retv = 0;
|
|
break;
|
|
case IPV6_MTU:
|
|
if (optlen < sizeof(int))
|
|
goto e_inval;
|
|
if (val && val < IPV6_MIN_MTU)
|
|
goto e_inval;
|
|
np->frag_size = val;
|
|
retv = 0;
|
|
break;
|
|
case IPV6_RECVERR:
|
|
if (optlen < sizeof(int))
|
|
goto e_inval;
|
|
np->recverr = valbool;
|
|
if (!val)
|
|
skb_queue_purge(&sk->sk_error_queue);
|
|
retv = 0;
|
|
break;
|
|
case IPV6_FLOWINFO_SEND:
|
|
if (optlen < sizeof(int))
|
|
goto e_inval;
|
|
np->sndflow = valbool;
|
|
retv = 0;
|
|
break;
|
|
case IPV6_FLOWLABEL_MGR:
|
|
retv = ipv6_flowlabel_opt(sk, optval, optlen);
|
|
break;
|
|
case IPV6_IPSEC_POLICY:
|
|
case IPV6_XFRM_POLICY:
|
|
retv = -EPERM;
|
|
if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
|
|
break;
|
|
retv = xfrm_user_policy(sk, optname, optval, optlen);
|
|
break;
|
|
|
|
case IPV6_ADDR_PREFERENCES:
|
|
if (optlen < sizeof(int))
|
|
goto e_inval;
|
|
retv = __ip6_sock_set_addr_preferences(sk, val);
|
|
break;
|
|
case IPV6_MINHOPCOUNT:
|
|
if (optlen < sizeof(int))
|
|
goto e_inval;
|
|
if (val < 0 || val > 255)
|
|
goto e_inval;
|
|
np->min_hopcount = val;
|
|
retv = 0;
|
|
break;
|
|
case IPV6_DONTFRAG:
|
|
np->dontfrag = valbool;
|
|
retv = 0;
|
|
break;
|
|
case IPV6_AUTOFLOWLABEL:
|
|
np->autoflowlabel = valbool;
|
|
np->autoflowlabel_set = 1;
|
|
retv = 0;
|
|
break;
|
|
case IPV6_RECVFRAGSIZE:
|
|
np->rxopt.bits.recvfragsize = valbool;
|
|
retv = 0;
|
|
break;
|
|
case IPV6_RECVERR_RFC4884:
|
|
if (optlen < sizeof(int))
|
|
goto e_inval;
|
|
if (val < 0 || val > 1)
|
|
goto e_inval;
|
|
np->recverr_rfc4884 = valbool;
|
|
retv = 0;
|
|
break;
|
|
}
|
|
|
|
release_sock(sk);
|
|
if (needs_rtnl)
|
|
rtnl_unlock();
|
|
|
|
return retv;
|
|
|
|
e_inval:
|
|
release_sock(sk);
|
|
if (needs_rtnl)
|
|
rtnl_unlock();
|
|
return -EINVAL;
|
|
}
|
|
|
|
int ipv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
|
|
unsigned int optlen)
|
|
{
|
|
int err;
|
|
|
|
if (level == SOL_IP && sk->sk_type != SOCK_RAW)
|
|
return udp_prot.setsockopt(sk, level, optname, optval, optlen);
|
|
|
|
if (level != SOL_IPV6)
|
|
return -ENOPROTOOPT;
|
|
|
|
err = do_ipv6_setsockopt(sk, level, optname, optval, optlen);
|
|
#ifdef CONFIG_NETFILTER
|
|
/* we need to exclude all possible ENOPROTOOPTs except default case */
|
|
if (err == -ENOPROTOOPT && optname != IPV6_IPSEC_POLICY &&
|
|
optname != IPV6_XFRM_POLICY)
|
|
err = nf_setsockopt(sk, PF_INET6, optname, optval, optlen);
|
|
#endif
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(ipv6_setsockopt);
|
|
|
|
static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
|
|
int optname, char __user *optval, int len)
|
|
{
|
|
struct ipv6_opt_hdr *hdr;
|
|
|
|
if (!opt)
|
|
return 0;
|
|
|
|
switch (optname) {
|
|
case IPV6_HOPOPTS:
|
|
hdr = opt->hopopt;
|
|
break;
|
|
case IPV6_RTHDRDSTOPTS:
|
|
hdr = opt->dst0opt;
|
|
break;
|
|
case IPV6_RTHDR:
|
|
hdr = (struct ipv6_opt_hdr *)opt->srcrt;
|
|
break;
|
|
case IPV6_DSTOPTS:
|
|
hdr = opt->dst1opt;
|
|
break;
|
|
default:
|
|
return -EINVAL; /* should not happen */
|
|
}
|
|
|
|
if (!hdr)
|
|
return 0;
|
|
|
|
len = min_t(unsigned int, len, ipv6_optlen(hdr));
|
|
if (copy_to_user(optval, hdr, len))
|
|
return -EFAULT;
|
|
return len;
|
|
}
|
|
|
|
static int ipv6_get_msfilter(struct sock *sk, void __user *optval,
|
|
int __user *optlen, int len)
|
|
{
|
|
const int size0 = offsetof(struct group_filter, gf_slist);
|
|
struct group_filter __user *p = optval;
|
|
struct group_filter gsf;
|
|
int num;
|
|
int err;
|
|
|
|
if (len < size0)
|
|
return -EINVAL;
|
|
if (copy_from_user(&gsf, p, size0))
|
|
return -EFAULT;
|
|
if (gsf.gf_group.ss_family != AF_INET6)
|
|
return -EADDRNOTAVAIL;
|
|
num = gsf.gf_numsrc;
|
|
lock_sock(sk);
|
|
err = ip6_mc_msfget(sk, &gsf, p->gf_slist);
|
|
if (!err) {
|
|
if (num > gsf.gf_numsrc)
|
|
num = gsf.gf_numsrc;
|
|
if (put_user(GROUP_FILTER_SIZE(num), optlen) ||
|
|
copy_to_user(p, &gsf, size0))
|
|
err = -EFAULT;
|
|
}
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
static int compat_ipv6_get_msfilter(struct sock *sk, void __user *optval,
|
|
int __user *optlen)
|
|
{
|
|
const int size0 = offsetof(struct compat_group_filter, gf_slist);
|
|
struct compat_group_filter __user *p = optval;
|
|
struct compat_group_filter gf32;
|
|
struct group_filter gf;
|
|
int len, err;
|
|
int num;
|
|
|
|
if (get_user(len, optlen))
|
|
return -EFAULT;
|
|
if (len < size0)
|
|
return -EINVAL;
|
|
|
|
if (copy_from_user(&gf32, p, size0))
|
|
return -EFAULT;
|
|
gf.gf_interface = gf32.gf_interface;
|
|
gf.gf_fmode = gf32.gf_fmode;
|
|
num = gf.gf_numsrc = gf32.gf_numsrc;
|
|
gf.gf_group = gf32.gf_group;
|
|
|
|
if (gf.gf_group.ss_family != AF_INET6)
|
|
return -EADDRNOTAVAIL;
|
|
|
|
lock_sock(sk);
|
|
err = ip6_mc_msfget(sk, &gf, p->gf_slist);
|
|
release_sock(sk);
|
|
if (err)
|
|
return err;
|
|
if (num > gf.gf_numsrc)
|
|
num = gf.gf_numsrc;
|
|
len = GROUP_FILTER_SIZE(num) - (sizeof(gf)-sizeof(gf32));
|
|
if (put_user(len, optlen) ||
|
|
put_user(gf.gf_fmode, &p->gf_fmode) ||
|
|
put_user(gf.gf_numsrc, &p->gf_numsrc))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
|
|
static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, int __user *optlen, unsigned int flags)
|
|
{
|
|
struct ipv6_pinfo *np = inet6_sk(sk);
|
|
int len;
|
|
int val;
|
|
|
|
if (ip6_mroute_opt(optname))
|
|
return ip6_mroute_getsockopt(sk, optname, optval, optlen);
|
|
|
|
if (get_user(len, optlen))
|
|
return -EFAULT;
|
|
switch (optname) {
|
|
case IPV6_ADDRFORM:
|
|
if (sk->sk_protocol != IPPROTO_UDP &&
|
|
sk->sk_protocol != IPPROTO_UDPLITE &&
|
|
sk->sk_protocol != IPPROTO_TCP)
|
|
return -ENOPROTOOPT;
|
|
if (sk->sk_state != TCP_ESTABLISHED)
|
|
return -ENOTCONN;
|
|
val = sk->sk_family;
|
|
break;
|
|
case MCAST_MSFILTER:
|
|
if (in_compat_syscall())
|
|
return compat_ipv6_get_msfilter(sk, optval, optlen);
|
|
return ipv6_get_msfilter(sk, optval, optlen, len);
|
|
case IPV6_2292PKTOPTIONS:
|
|
{
|
|
struct msghdr msg;
|
|
struct sk_buff *skb;
|
|
|
|
if (sk->sk_type != SOCK_STREAM)
|
|
return -ENOPROTOOPT;
|
|
|
|
msg.msg_control_user = optval;
|
|
msg.msg_controllen = len;
|
|
msg.msg_flags = flags;
|
|
msg.msg_control_is_user = true;
|
|
|
|
lock_sock(sk);
|
|
skb = np->pktoptions;
|
|
if (skb)
|
|
ip6_datagram_recv_ctl(sk, &msg, skb);
|
|
release_sock(sk);
|
|
if (!skb) {
|
|
if (np->rxopt.bits.rxinfo) {
|
|
struct in6_pktinfo src_info;
|
|
src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
|
|
np->sticky_pktinfo.ipi6_ifindex;
|
|
src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr : np->sticky_pktinfo.ipi6_addr;
|
|
put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
|
|
}
|
|
if (np->rxopt.bits.rxhlim) {
|
|
int hlim = np->mcast_hops;
|
|
put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
|
|
}
|
|
if (np->rxopt.bits.rxtclass) {
|
|
int tclass = (int)ip6_tclass(np->rcv_flowinfo);
|
|
|
|
put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
|
|
}
|
|
if (np->rxopt.bits.rxoinfo) {
|
|
struct in6_pktinfo src_info;
|
|
src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
|
|
np->sticky_pktinfo.ipi6_ifindex;
|
|
src_info.ipi6_addr = np->mcast_oif ? sk->sk_v6_daddr :
|
|
np->sticky_pktinfo.ipi6_addr;
|
|
put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
|
|
}
|
|
if (np->rxopt.bits.rxohlim) {
|
|
int hlim = np->mcast_hops;
|
|
put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
|
|
}
|
|
if (np->rxopt.bits.rxflow) {
|
|
__be32 flowinfo = np->rcv_flowinfo;
|
|
|
|
put_cmsg(&msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
|
|
}
|
|
}
|
|
len -= msg.msg_controllen;
|
|
return put_user(len, optlen);
|
|
}
|
|
case IPV6_MTU:
|
|
{
|
|
struct dst_entry *dst;
|
|
|
|
val = 0;
|
|
rcu_read_lock();
|
|
dst = __sk_dst_get(sk);
|
|
if (dst)
|
|
val = dst_mtu(dst);
|
|
rcu_read_unlock();
|
|
if (!val)
|
|
return -ENOTCONN;
|
|
break;
|
|
}
|
|
|
|
case IPV6_V6ONLY:
|
|
val = sk->sk_ipv6only;
|
|
break;
|
|
|
|
case IPV6_RECVPKTINFO:
|
|
val = np->rxopt.bits.rxinfo;
|
|
break;
|
|
|
|
case IPV6_2292PKTINFO:
|
|
val = np->rxopt.bits.rxoinfo;
|
|
break;
|
|
|
|
case IPV6_RECVHOPLIMIT:
|
|
val = np->rxopt.bits.rxhlim;
|
|
break;
|
|
|
|
case IPV6_2292HOPLIMIT:
|
|
val = np->rxopt.bits.rxohlim;
|
|
break;
|
|
|
|
case IPV6_RECVRTHDR:
|
|
val = np->rxopt.bits.srcrt;
|
|
break;
|
|
|
|
case IPV6_2292RTHDR:
|
|
val = np->rxopt.bits.osrcrt;
|
|
break;
|
|
|
|
case IPV6_HOPOPTS:
|
|
case IPV6_RTHDRDSTOPTS:
|
|
case IPV6_RTHDR:
|
|
case IPV6_DSTOPTS:
|
|
{
|
|
struct ipv6_txoptions *opt;
|
|
|
|
lock_sock(sk);
|
|
opt = rcu_dereference_protected(np->opt,
|
|
lockdep_sock_is_held(sk));
|
|
len = ipv6_getsockopt_sticky(sk, opt, optname, optval, len);
|
|
release_sock(sk);
|
|
/* check if ipv6_getsockopt_sticky() returns err code */
|
|
if (len < 0)
|
|
return len;
|
|
return put_user(len, optlen);
|
|
}
|
|
|
|
case IPV6_RECVHOPOPTS:
|
|
val = np->rxopt.bits.hopopts;
|
|
break;
|
|
|
|
case IPV6_2292HOPOPTS:
|
|
val = np->rxopt.bits.ohopopts;
|
|
break;
|
|
|
|
case IPV6_RECVDSTOPTS:
|
|
val = np->rxopt.bits.dstopts;
|
|
break;
|
|
|
|
case IPV6_2292DSTOPTS:
|
|
val = np->rxopt.bits.odstopts;
|
|
break;
|
|
|
|
case IPV6_TCLASS:
|
|
val = np->tclass;
|
|
break;
|
|
|
|
case IPV6_RECVTCLASS:
|
|
val = np->rxopt.bits.rxtclass;
|
|
break;
|
|
|
|
case IPV6_FLOWINFO:
|
|
val = np->rxopt.bits.rxflow;
|
|
break;
|
|
|
|
case IPV6_RECVPATHMTU:
|
|
val = np->rxopt.bits.rxpmtu;
|
|
break;
|
|
|
|
case IPV6_PATHMTU:
|
|
{
|
|
struct dst_entry *dst;
|
|
struct ip6_mtuinfo mtuinfo;
|
|
|
|
if (len < sizeof(mtuinfo))
|
|
return -EINVAL;
|
|
|
|
len = sizeof(mtuinfo);
|
|
memset(&mtuinfo, 0, sizeof(mtuinfo));
|
|
|
|
rcu_read_lock();
|
|
dst = __sk_dst_get(sk);
|
|
if (dst)
|
|
mtuinfo.ip6m_mtu = dst_mtu(dst);
|
|
rcu_read_unlock();
|
|
if (!mtuinfo.ip6m_mtu)
|
|
return -ENOTCONN;
|
|
|
|
if (put_user(len, optlen))
|
|
return -EFAULT;
|
|
if (copy_to_user(optval, &mtuinfo, len))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
case IPV6_TRANSPARENT:
|
|
val = inet_sk(sk)->transparent;
|
|
break;
|
|
|
|
case IPV6_FREEBIND:
|
|
val = inet_sk(sk)->freebind;
|
|
break;
|
|
|
|
case IPV6_RECVORIGDSTADDR:
|
|
val = np->rxopt.bits.rxorigdstaddr;
|
|
break;
|
|
|
|
case IPV6_UNICAST_HOPS:
|
|
case IPV6_MULTICAST_HOPS:
|
|
{
|
|
struct dst_entry *dst;
|
|
|
|
if (optname == IPV6_UNICAST_HOPS)
|
|
val = np->hop_limit;
|
|
else
|
|
val = np->mcast_hops;
|
|
|
|
if (val < 0) {
|
|
rcu_read_lock();
|
|
dst = __sk_dst_get(sk);
|
|
if (dst)
|
|
val = ip6_dst_hoplimit(dst);
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
if (val < 0)
|
|
val = sock_net(sk)->ipv6.devconf_all->hop_limit;
|
|
break;
|
|
}
|
|
|
|
case IPV6_MULTICAST_LOOP:
|
|
val = np->mc_loop;
|
|
break;
|
|
|
|
case IPV6_MULTICAST_IF:
|
|
val = np->mcast_oif;
|
|
break;
|
|
|
|
case IPV6_MULTICAST_ALL:
|
|
val = np->mc_all;
|
|
break;
|
|
|
|
case IPV6_UNICAST_IF:
|
|
val = (__force int)htonl((__u32) np->ucast_oif);
|
|
break;
|
|
|
|
case IPV6_MTU_DISCOVER:
|
|
val = np->pmtudisc;
|
|
break;
|
|
|
|
case IPV6_RECVERR:
|
|
val = np->recverr;
|
|
break;
|
|
|
|
case IPV6_FLOWINFO_SEND:
|
|
val = np->sndflow;
|
|
break;
|
|
|
|
case IPV6_FLOWLABEL_MGR:
|
|
{
|
|
struct in6_flowlabel_req freq;
|
|
int flags;
|
|
|
|
if (len < sizeof(freq))
|
|
return -EINVAL;
|
|
|
|
if (copy_from_user(&freq, optval, sizeof(freq)))
|
|
return -EFAULT;
|
|
|
|
if (freq.flr_action != IPV6_FL_A_GET)
|
|
return -EINVAL;
|
|
|
|
len = sizeof(freq);
|
|
flags = freq.flr_flags;
|
|
|
|
memset(&freq, 0, sizeof(freq));
|
|
|
|
val = ipv6_flowlabel_opt_get(sk, &freq, flags);
|
|
if (val < 0)
|
|
return val;
|
|
|
|
if (put_user(len, optlen))
|
|
return -EFAULT;
|
|
if (copy_to_user(optval, &freq, len))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
case IPV6_ADDR_PREFERENCES:
|
|
val = 0;
|
|
|
|
if (np->srcprefs & IPV6_PREFER_SRC_TMP)
|
|
val |= IPV6_PREFER_SRC_TMP;
|
|
else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
|
|
val |= IPV6_PREFER_SRC_PUBLIC;
|
|
else {
|
|
/* XXX: should we return system default? */
|
|
val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
|
|
}
|
|
|
|
if (np->srcprefs & IPV6_PREFER_SRC_COA)
|
|
val |= IPV6_PREFER_SRC_COA;
|
|
else
|
|
val |= IPV6_PREFER_SRC_HOME;
|
|
break;
|
|
|
|
case IPV6_MINHOPCOUNT:
|
|
val = np->min_hopcount;
|
|
break;
|
|
|
|
case IPV6_DONTFRAG:
|
|
val = np->dontfrag;
|
|
break;
|
|
|
|
case IPV6_AUTOFLOWLABEL:
|
|
val = ip6_autoflowlabel(sock_net(sk), np);
|
|
break;
|
|
|
|
case IPV6_RECVFRAGSIZE:
|
|
val = np->rxopt.bits.recvfragsize;
|
|
break;
|
|
|
|
case IPV6_ROUTER_ALERT_ISOLATE:
|
|
val = np->rtalert_isolate;
|
|
break;
|
|
|
|
case IPV6_RECVERR_RFC4884:
|
|
val = np->recverr_rfc4884;
|
|
break;
|
|
|
|
default:
|
|
return -ENOPROTOOPT;
|
|
}
|
|
len = min_t(unsigned int, sizeof(int), len);
|
|
if (put_user(len, optlen))
|
|
return -EFAULT;
|
|
if (copy_to_user(optval, &val, len))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
|
|
int ipv6_getsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, int __user *optlen)
|
|
{
|
|
int err;
|
|
|
|
if (level == SOL_IP && sk->sk_type != SOCK_RAW)
|
|
return udp_prot.getsockopt(sk, level, optname, optval, optlen);
|
|
|
|
if (level != SOL_IPV6)
|
|
return -ENOPROTOOPT;
|
|
|
|
err = do_ipv6_getsockopt(sk, level, optname, optval, optlen, 0);
|
|
#ifdef CONFIG_NETFILTER
|
|
/* we need to exclude all possible ENOPROTOOPTs except default case */
|
|
if (err == -ENOPROTOOPT && optname != IPV6_2292PKTOPTIONS) {
|
|
int len;
|
|
|
|
if (get_user(len, optlen))
|
|
return -EFAULT;
|
|
|
|
err = nf_getsockopt(sk, PF_INET6, optname, optval, &len);
|
|
if (err >= 0)
|
|
err = put_user(len, optlen);
|
|
}
|
|
#endif
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(ipv6_getsockopt);
|