mirror of
https://github.com/torvalds/linux.git
synced 2024-12-06 19:11:31 +00:00
06497763c8
With latest sync from net-next tree, bpf-next has a bpf selftest failure:
[root@arch-fb-vm1 bpf]# ./test_progs -t setget_sockopt
...
[ 76.194349] ============================================
[ 76.194682] WARNING: possible recursive locking detected
[ 76.195039] 6.6.0-rc7-g37884503df08-dirty #67 Tainted: G W OE
[ 76.195518] --------------------------------------------
[ 76.195852] new_name/154 is trying to acquire lock:
[ 76.196159] ffff8c3e06ad8d30 (sk_lock-AF_INET){+.+.}-{0:0}, at: ip_sock_set_tos+0x19/0x30
[ 76.196669]
[ 76.196669] but task is already holding lock:
[ 76.197028] ffff8c3e06ad8d30 (sk_lock-AF_INET){+.+.}-{0:0}, at: inet_listen+0x21/0x70
[ 76.197517]
[ 76.197517] other info that might help us debug this:
[ 76.197919] Possible unsafe locking scenario:
[ 76.197919]
[ 76.198287] CPU0
[ 76.198444] ----
[ 76.198600] lock(sk_lock-AF_INET);
[ 76.198831] lock(sk_lock-AF_INET);
[ 76.199062]
[ 76.199062] *** DEADLOCK ***
[ 76.199062]
[ 76.199420] May be due to missing lock nesting notation
[ 76.199420]
[ 76.199879] 2 locks held by new_name/154:
[ 76.200131] #0: ffff8c3e06ad8d30 (sk_lock-AF_INET){+.+.}-{0:0}, at: inet_listen+0x21/0x70
[ 76.200644] #1: ffffffff90f96a40 (rcu_read_lock){....}-{1:2}, at: __cgroup_bpf_run_filter_sock_ops+0x55/0x290
[ 76.201268]
[ 76.201268] stack backtrace:
[ 76.201538] CPU: 4 PID: 154 Comm: new_name Tainted: G W OE 6.6.0-rc7-g37884503df08-dirty #67
[ 76.202134] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014
[ 76.202699] Call Trace:
[ 76.202858] <TASK>
[ 76.203002] dump_stack_lvl+0x4b/0x80
[ 76.203239] __lock_acquire+0x740/0x1ec0
[ 76.203503] lock_acquire+0xc1/0x2a0
[ 76.203766] ? ip_sock_set_tos+0x19/0x30
[ 76.204050] ? sk_stream_write_space+0x12a/0x230
[ 76.204389] ? lock_release+0xbe/0x260
[ 76.204661] lock_sock_nested+0x32/0x80
[ 76.204942] ? ip_sock_set_tos+0x19/0x30
[ 76.205208] ip_sock_set_tos+0x19/0x30
[ 76.205452] do_ip_setsockopt+0x4b3/0x1580
[ 76.205719] __bpf_setsockopt+0x62/0xa0
[ 76.205963] bpf_sock_ops_setsockopt+0x11/0x20
[ 76.206247] bpf_prog_630217292049c96e_bpf_test_sockopt_int+0xbc/0x123
[ 76.206660] bpf_prog_493685a3bae00bbd_bpf_test_ip_sockopt+0x49/0x4b
[ 76.207055] bpf_prog_b0bcd27f269aeea0_skops_sockopt+0x44c/0xec7
[ 76.207437] __cgroup_bpf_run_filter_sock_ops+0xda/0x290
[ 76.207829] __inet_listen_sk+0x108/0x1b0
[ 76.208122] inet_listen+0x48/0x70
[ 76.208373] __sys_listen+0x74/0xb0
[ 76.208630] __x64_sys_listen+0x16/0x20
[ 76.208911] do_syscall_64+0x3f/0x90
[ 76.209174] entry_SYSCALL_64_after_hwframe+0x6e/0xd8
...
Both ip_sock_set_tos() and inet_listen() calls lock_sock(sk) which
caused a dead lock.
To fix the issue, use sockopt_lock_sock() in ip_sock_set_tos()
instead. sockopt_lock_sock() will avoid lock_sock() if it is in bpf
context.
Fixes: 878d951c67
("inet: lock the socket in ip_sock_set_tos()")
Suggested-by: Martin KaFai Lau <martin.lau@kernel.org>
Signed-off-by: Yonghong Song <yonghong.song@linux.dev>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20231027182424.1444845-1-yonghong.song@linux.dev
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
1790 lines
42 KiB
C
1790 lines
42 KiB
C
// SPDX-License-Identifier: GPL-2.0
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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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*
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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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* Alan Cox : Fixed a couple of oopses in Martin's
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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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#include <linux/inetdevice.h>
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#include <linux/netdevice.h>
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#include <linux/slab.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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#include <net/tcp_states.h>
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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/inet_ecn.h>
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#include <net/route.h>
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#include <net/xfrm.h>
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#include <net/compat.h>
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#include <net/checksum.h>
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#if IS_ENABLED(CONFIG_IPV6)
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#include <net/transp_v6.h>
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#endif
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#include <net/ip_fib.h>
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#include <linux/errqueue.h>
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#include <linux/uaccess.h>
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#include <linux/bpfilter.h>
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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 = *PKTINFO_SKB_CB(skb);
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info.ipi_addr.s_addr = ip_hdr(skb)->daddr;
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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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int ttl = ip_hdr(skb)->ttl;
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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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put_cmsg(msg, SOL_IP, IP_TOS, 1, &ip_hdr(skb)->tos);
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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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put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen,
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ip_hdr(skb) + 1);
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}
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static void ip_cmsg_recv_retopts(struct net *net, struct msghdr *msg,
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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(net, 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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static void ip_cmsg_recv_fragsize(struct msghdr *msg, struct sk_buff *skb)
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{
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int val;
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if (IPCB(skb)->frag_max_size == 0)
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return;
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val = IPCB(skb)->frag_max_size;
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put_cmsg(msg, SOL_IP, IP_RECVFRAGSIZE, sizeof(val), &val);
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}
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static void ip_cmsg_recv_checksum(struct msghdr *msg, struct sk_buff *skb,
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int tlen, int offset)
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{
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__wsum csum = skb->csum;
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if (skb->ip_summed != CHECKSUM_COMPLETE)
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return;
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if (offset != 0) {
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int tend_off = skb_transport_offset(skb) + tlen;
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csum = csum_sub(csum, skb_checksum(skb, tend_off, offset, 0));
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}
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put_cmsg(msg, SOL_IP, IP_CHECKSUM, sizeof(__wsum), &csum);
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}
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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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u32 seclen, secid;
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int err;
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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);
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if (err)
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return;
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put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
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security_release_secctx(secdata, seclen);
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}
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static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
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{
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__be16 _ports[2], *ports;
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struct sockaddr_in sin;
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/* All current transport protocols have the port numbers in the
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* first four bytes of the transport header and this function is
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* written with this assumption in mind.
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*/
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ports = skb_header_pointer(skb, skb_transport_offset(skb),
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sizeof(_ports), &_ports);
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if (!ports)
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return;
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sin.sin_family = AF_INET;
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sin.sin_addr.s_addr = ip_hdr(skb)->daddr;
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sin.sin_port = ports[1];
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memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
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put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
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}
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void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk,
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struct sk_buff *skb, int tlen, int offset)
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{
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unsigned long flags = inet_cmsg_flags(inet_sk(sk));
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if (!flags)
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return;
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/* Ordered by supposed usage frequency */
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if (flags & IP_CMSG_PKTINFO) {
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ip_cmsg_recv_pktinfo(msg, skb);
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flags &= ~IP_CMSG_PKTINFO;
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if (!flags)
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return;
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}
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if (flags & IP_CMSG_TTL) {
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ip_cmsg_recv_ttl(msg, skb);
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flags &= ~IP_CMSG_TTL;
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if (!flags)
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return;
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}
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if (flags & IP_CMSG_TOS) {
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ip_cmsg_recv_tos(msg, skb);
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flags &= ~IP_CMSG_TOS;
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if (!flags)
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return;
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}
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if (flags & IP_CMSG_RECVOPTS) {
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ip_cmsg_recv_opts(msg, skb);
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flags &= ~IP_CMSG_RECVOPTS;
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if (!flags)
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return;
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}
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if (flags & IP_CMSG_RETOPTS) {
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ip_cmsg_recv_retopts(sock_net(sk), msg, skb);
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flags &= ~IP_CMSG_RETOPTS;
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if (!flags)
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return;
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}
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if (flags & IP_CMSG_PASSSEC) {
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ip_cmsg_recv_security(msg, skb);
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flags &= ~IP_CMSG_PASSSEC;
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if (!flags)
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return;
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}
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if (flags & IP_CMSG_ORIGDSTADDR) {
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ip_cmsg_recv_dstaddr(msg, skb);
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flags &= ~IP_CMSG_ORIGDSTADDR;
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if (!flags)
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return;
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}
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if (flags & IP_CMSG_CHECKSUM)
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ip_cmsg_recv_checksum(msg, skb, tlen, offset);
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if (flags & IP_CMSG_RECVFRAGSIZE)
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ip_cmsg_recv_fragsize(msg, skb);
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}
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EXPORT_SYMBOL(ip_cmsg_recv_offset);
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int ip_cmsg_send(struct sock *sk, struct msghdr *msg, struct ipcm_cookie *ipc,
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bool allow_ipv6)
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{
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int err, val;
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struct cmsghdr *cmsg;
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struct net *net = sock_net(sk);
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for_each_cmsghdr(cmsg, msg) {
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if (!CMSG_OK(msg, cmsg))
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return -EINVAL;
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#if IS_ENABLED(CONFIG_IPV6)
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if (allow_ipv6 &&
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cmsg->cmsg_level == SOL_IPV6 &&
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cmsg->cmsg_type == IPV6_PKTINFO) {
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struct in6_pktinfo *src_info;
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if (cmsg->cmsg_len < CMSG_LEN(sizeof(*src_info)))
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return -EINVAL;
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src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
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if (!ipv6_addr_v4mapped(&src_info->ipi6_addr))
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return -EINVAL;
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if (src_info->ipi6_ifindex)
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ipc->oif = src_info->ipi6_ifindex;
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ipc->addr = src_info->ipi6_addr.s6_addr32[3];
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continue;
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}
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#endif
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if (cmsg->cmsg_level == SOL_SOCKET) {
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err = __sock_cmsg_send(sk, cmsg, &ipc->sockc);
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if (err)
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return err;
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continue;
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}
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if (cmsg->cmsg_level != SOL_IP)
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continue;
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switch (cmsg->cmsg_type) {
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case IP_RETOPTS:
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err = cmsg->cmsg_len - sizeof(struct cmsghdr);
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/* Our caller is responsible for freeing ipc->opt */
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err = ip_options_get(net, &ipc->opt,
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KERNEL_SOCKPTR(CMSG_DATA(cmsg)),
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err < 40 ? err : 40);
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if (err)
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return err;
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break;
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case IP_PKTINFO:
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{
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struct in_pktinfo *info;
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if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
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return -EINVAL;
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info = (struct in_pktinfo *)CMSG_DATA(cmsg);
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if (info->ipi_ifindex)
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ipc->oif = info->ipi_ifindex;
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ipc->addr = info->ipi_spec_dst.s_addr;
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break;
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}
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case IP_TTL:
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if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
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return -EINVAL;
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val = *(int *)CMSG_DATA(cmsg);
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if (val < 1 || val > 255)
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return -EINVAL;
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ipc->ttl = val;
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break;
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case IP_TOS:
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if (cmsg->cmsg_len == CMSG_LEN(sizeof(int)))
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val = *(int *)CMSG_DATA(cmsg);
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else if (cmsg->cmsg_len == CMSG_LEN(sizeof(u8)))
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val = *(u8 *)CMSG_DATA(cmsg);
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else
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return -EINVAL;
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if (val < 0 || val > 255)
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return -EINVAL;
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ipc->tos = val;
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ipc->priority = rt_tos2priority(ipc->tos);
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break;
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case IP_PROTOCOL:
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if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
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return -EINVAL;
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val = *(int *)CMSG_DATA(cmsg);
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if (val < 1 || val > 255)
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return -EINVAL;
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ipc->protocol = val;
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break;
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default:
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return -EINVAL;
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}
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}
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return 0;
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}
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static void ip_ra_destroy_rcu(struct rcu_head *head)
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{
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struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu);
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sock_put(ra->saved_sk);
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kfree(ra);
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}
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int ip_ra_control(struct sock *sk, unsigned char on,
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void (*destructor)(struct sock *))
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{
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struct ip_ra_chain *ra, *new_ra;
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struct ip_ra_chain __rcu **rap;
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struct net *net = sock_net(sk);
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if (sk->sk_type != SOCK_RAW || inet_sk(sk)->inet_num == IPPROTO_RAW)
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return -EINVAL;
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new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
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if (on && !new_ra)
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return -ENOMEM;
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mutex_lock(&net->ipv4.ra_mutex);
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for (rap = &net->ipv4.ra_chain;
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(ra = rcu_dereference_protected(*rap,
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lockdep_is_held(&net->ipv4.ra_mutex))) != NULL;
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rap = &ra->next) {
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if (ra->sk == sk) {
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if (on) {
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mutex_unlock(&net->ipv4.ra_mutex);
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kfree(new_ra);
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return -EADDRINUSE;
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}
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/* dont let ip_call_ra_chain() use sk again */
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ra->sk = NULL;
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RCU_INIT_POINTER(*rap, ra->next);
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mutex_unlock(&net->ipv4.ra_mutex);
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if (ra->destructor)
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ra->destructor(sk);
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/*
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* Delay sock_put(sk) and kfree(ra) after one rcu grace
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* period. This guarantee ip_call_ra_chain() dont need
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* to mess with socket refcounts.
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*/
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ra->saved_sk = sk;
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call_rcu(&ra->rcu, ip_ra_destroy_rcu);
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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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mutex_unlock(&net->ipv4.ra_mutex);
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return -ENOBUFS;
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}
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new_ra->sk = sk;
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new_ra->destructor = destructor;
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RCU_INIT_POINTER(new_ra->next, ra);
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rcu_assign_pointer(*rap, new_ra);
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sock_hold(sk);
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mutex_unlock(&net->ipv4.ra_mutex);
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return 0;
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}
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static void ipv4_icmp_error_rfc4884(const struct sk_buff *skb,
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struct sock_ee_data_rfc4884 *out)
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{
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switch (icmp_hdr(skb)->type) {
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case ICMP_DEST_UNREACH:
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case ICMP_TIME_EXCEEDED:
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case ICMP_PARAMETERPROB:
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ip_icmp_error_rfc4884(skb, out, sizeof(struct icmphdr),
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icmp_hdr(skb)->un.reserved[1] * 4);
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}
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}
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|
|
void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
|
|
__be16 port, u32 info, u8 *payload)
|
|
{
|
|
struct sock_exterr_skb *serr;
|
|
|
|
skb = skb_clone(skb, GFP_ATOMIC);
|
|
if (!skb)
|
|
return;
|
|
|
|
serr = SKB_EXT_ERR(skb);
|
|
serr->ee.ee_errno = err;
|
|
serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
|
|
serr->ee.ee_type = icmp_hdr(skb)->type;
|
|
serr->ee.ee_code = icmp_hdr(skb)->code;
|
|
serr->ee.ee_pad = 0;
|
|
serr->ee.ee_info = info;
|
|
serr->ee.ee_data = 0;
|
|
serr->addr_offset = (u8 *)&(((struct iphdr *)(icmp_hdr(skb) + 1))->daddr) -
|
|
skb_network_header(skb);
|
|
serr->port = port;
|
|
|
|
if (skb_pull(skb, payload - skb->data)) {
|
|
if (inet_test_bit(RECVERR_RFC4884, sk))
|
|
ipv4_icmp_error_rfc4884(skb, &serr->ee.ee_rfc4884);
|
|
|
|
skb_reset_transport_header(skb);
|
|
if (sock_queue_err_skb(sk, skb) == 0)
|
|
return;
|
|
}
|
|
kfree_skb(skb);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ip_icmp_error);
|
|
|
|
void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 info)
|
|
{
|
|
struct sock_exterr_skb *serr;
|
|
struct iphdr *iph;
|
|
struct sk_buff *skb;
|
|
|
|
if (!inet_test_bit(RECVERR, sk))
|
|
return;
|
|
|
|
skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
|
|
if (!skb)
|
|
return;
|
|
|
|
skb_put(skb, sizeof(struct iphdr));
|
|
skb_reset_network_header(skb);
|
|
iph = ip_hdr(skb);
|
|
iph->daddr = daddr;
|
|
|
|
serr = SKB_EXT_ERR(skb);
|
|
serr->ee.ee_errno = err;
|
|
serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
|
|
serr->ee.ee_type = 0;
|
|
serr->ee.ee_code = 0;
|
|
serr->ee.ee_pad = 0;
|
|
serr->ee.ee_info = info;
|
|
serr->ee.ee_data = 0;
|
|
serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
|
|
serr->port = port;
|
|
|
|
__skb_pull(skb, skb_tail_pointer(skb) - skb->data);
|
|
skb_reset_transport_header(skb);
|
|
|
|
if (sock_queue_err_skb(sk, skb))
|
|
kfree_skb(skb);
|
|
}
|
|
|
|
/* For some errors we have valid addr_offset even with zero payload and
|
|
* zero port. Also, addr_offset should be supported if port is set.
|
|
*/
|
|
static inline bool ipv4_datagram_support_addr(struct sock_exterr_skb *serr)
|
|
{
|
|
return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
|
|
serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port;
|
|
}
|
|
|
|
/* IPv4 supports cmsg on all imcp errors and some timestamps
|
|
*
|
|
* Timestamp code paths do not initialize the fields expected by cmsg:
|
|
* the PKTINFO fields in skb->cb[]. Fill those in here.
|
|
*/
|
|
static bool ipv4_datagram_support_cmsg(const struct sock *sk,
|
|
struct sk_buff *skb,
|
|
int ee_origin)
|
|
{
|
|
struct in_pktinfo *info;
|
|
|
|
if (ee_origin == SO_EE_ORIGIN_ICMP)
|
|
return true;
|
|
|
|
if (ee_origin == SO_EE_ORIGIN_LOCAL)
|
|
return false;
|
|
|
|
/* Support IP_PKTINFO on tstamp packets if requested, to correlate
|
|
* timestamp with egress dev. Not possible for packets without iif
|
|
* or without payload (SOF_TIMESTAMPING_OPT_TSONLY).
|
|
*/
|
|
info = PKTINFO_SKB_CB(skb);
|
|
if (!(READ_ONCE(sk->sk_tsflags) & SOF_TIMESTAMPING_OPT_CMSG) ||
|
|
!info->ipi_ifindex)
|
|
return false;
|
|
|
|
info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr;
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* Handle MSG_ERRQUEUE
|
|
*/
|
|
int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
|
|
{
|
|
struct sock_exterr_skb *serr;
|
|
struct sk_buff *skb;
|
|
DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
|
|
struct {
|
|
struct sock_extended_err ee;
|
|
struct sockaddr_in offender;
|
|
} errhdr;
|
|
int err;
|
|
int copied;
|
|
|
|
err = -EAGAIN;
|
|
skb = sock_dequeue_err_skb(sk);
|
|
if (!skb)
|
|
goto out;
|
|
|
|
copied = skb->len;
|
|
if (copied > len) {
|
|
msg->msg_flags |= MSG_TRUNC;
|
|
copied = len;
|
|
}
|
|
err = skb_copy_datagram_msg(skb, 0, msg, copied);
|
|
if (unlikely(err)) {
|
|
kfree_skb(skb);
|
|
return err;
|
|
}
|
|
sock_recv_timestamp(msg, sk, skb);
|
|
|
|
serr = SKB_EXT_ERR(skb);
|
|
|
|
if (sin && ipv4_datagram_support_addr(serr)) {
|
|
sin->sin_family = AF_INET;
|
|
sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
|
|
serr->addr_offset);
|
|
sin->sin_port = serr->port;
|
|
memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
|
|
*addr_len = sizeof(*sin);
|
|
}
|
|
|
|
memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
|
|
sin = &errhdr.offender;
|
|
memset(sin, 0, sizeof(*sin));
|
|
|
|
if (ipv4_datagram_support_cmsg(sk, skb, serr->ee.ee_origin)) {
|
|
sin->sin_family = AF_INET;
|
|
sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
|
|
if (inet_cmsg_flags(inet_sk(sk)))
|
|
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;
|
|
|
|
consume_skb(skb);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
void __ip_sock_set_tos(struct sock *sk, int val)
|
|
{
|
|
u8 old_tos = inet_sk(sk)->tos;
|
|
|
|
if (sk->sk_type == SOCK_STREAM) {
|
|
val &= ~INET_ECN_MASK;
|
|
val |= old_tos & INET_ECN_MASK;
|
|
}
|
|
if (old_tos != val) {
|
|
WRITE_ONCE(inet_sk(sk)->tos, val);
|
|
WRITE_ONCE(sk->sk_priority, rt_tos2priority(val));
|
|
sk_dst_reset(sk);
|
|
}
|
|
}
|
|
|
|
void ip_sock_set_tos(struct sock *sk, int val)
|
|
{
|
|
sockopt_lock_sock(sk);
|
|
__ip_sock_set_tos(sk, val);
|
|
sockopt_release_sock(sk);
|
|
}
|
|
EXPORT_SYMBOL(ip_sock_set_tos);
|
|
|
|
void ip_sock_set_freebind(struct sock *sk)
|
|
{
|
|
inet_set_bit(FREEBIND, sk);
|
|
}
|
|
EXPORT_SYMBOL(ip_sock_set_freebind);
|
|
|
|
void ip_sock_set_recverr(struct sock *sk)
|
|
{
|
|
inet_set_bit(RECVERR, sk);
|
|
}
|
|
EXPORT_SYMBOL(ip_sock_set_recverr);
|
|
|
|
int ip_sock_set_mtu_discover(struct sock *sk, int val)
|
|
{
|
|
if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT)
|
|
return -EINVAL;
|
|
WRITE_ONCE(inet_sk(sk)->pmtudisc, val);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(ip_sock_set_mtu_discover);
|
|
|
|
void ip_sock_set_pktinfo(struct sock *sk)
|
|
{
|
|
inet_set_bit(PKTINFO, sk);
|
|
}
|
|
EXPORT_SYMBOL(ip_sock_set_pktinfo);
|
|
|
|
/*
|
|
* Socket option code for IP. This is the end of the line after any
|
|
* TCP,UDP etc options on an IP socket.
|
|
*/
|
|
static bool setsockopt_needs_rtnl(int optname)
|
|
{
|
|
switch (optname) {
|
|
case IP_ADD_MEMBERSHIP:
|
|
case IP_ADD_SOURCE_MEMBERSHIP:
|
|
case IP_BLOCK_SOURCE:
|
|
case IP_DROP_MEMBERSHIP:
|
|
case IP_DROP_SOURCE_MEMBERSHIP:
|
|
case IP_MSFILTER:
|
|
case IP_UNBLOCK_SOURCE:
|
|
case MCAST_BLOCK_SOURCE:
|
|
case MCAST_MSFILTER:
|
|
case MCAST_JOIN_GROUP:
|
|
case MCAST_JOIN_SOURCE_GROUP:
|
|
case MCAST_LEAVE_GROUP:
|
|
case MCAST_LEAVE_SOURCE_GROUP:
|
|
case MCAST_UNBLOCK_SOURCE:
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static int set_mcast_msfilter(struct sock *sk, int ifindex,
|
|
int numsrc, int fmode,
|
|
struct sockaddr_storage *group,
|
|
struct sockaddr_storage *list)
|
|
{
|
|
struct ip_msfilter *msf;
|
|
struct sockaddr_in *psin;
|
|
int err, i;
|
|
|
|
msf = kmalloc(IP_MSFILTER_SIZE(numsrc), GFP_KERNEL);
|
|
if (!msf)
|
|
return -ENOBUFS;
|
|
|
|
psin = (struct sockaddr_in *)group;
|
|
if (psin->sin_family != AF_INET)
|
|
goto Eaddrnotavail;
|
|
msf->imsf_multiaddr = psin->sin_addr.s_addr;
|
|
msf->imsf_interface = 0;
|
|
msf->imsf_fmode = fmode;
|
|
msf->imsf_numsrc = numsrc;
|
|
for (i = 0; i < numsrc; ++i) {
|
|
psin = (struct sockaddr_in *)&list[i];
|
|
|
|
if (psin->sin_family != AF_INET)
|
|
goto Eaddrnotavail;
|
|
msf->imsf_slist_flex[i] = psin->sin_addr.s_addr;
|
|
}
|
|
err = ip_mc_msfilter(sk, msf, ifindex);
|
|
kfree(msf);
|
|
return err;
|
|
|
|
Eaddrnotavail:
|
|
kfree(msf);
|
|
return -EADDRNOTAVAIL;
|
|
}
|
|
|
|
static int copy_group_source_from_sockptr(struct group_source_req *greqs,
|
|
sockptr_t optval, int optlen)
|
|
{
|
|
if (in_compat_syscall()) {
|
|
struct compat_group_source_req gr32;
|
|
|
|
if (optlen != sizeof(gr32))
|
|
return -EINVAL;
|
|
if (copy_from_sockptr(&gr32, optval, sizeof(gr32)))
|
|
return -EFAULT;
|
|
greqs->gsr_interface = gr32.gsr_interface;
|
|
greqs->gsr_group = gr32.gsr_group;
|
|
greqs->gsr_source = gr32.gsr_source;
|
|
} else {
|
|
if (optlen != sizeof(*greqs))
|
|
return -EINVAL;
|
|
if (copy_from_sockptr(greqs, optval, sizeof(*greqs)))
|
|
return -EFAULT;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int do_mcast_group_source(struct sock *sk, int optname,
|
|
sockptr_t optval, int optlen)
|
|
{
|
|
struct group_source_req greqs;
|
|
struct ip_mreq_source mreqs;
|
|
struct sockaddr_in *psin;
|
|
int omode, add, err;
|
|
|
|
err = copy_group_source_from_sockptr(&greqs, optval, optlen);
|
|
if (err)
|
|
return err;
|
|
|
|
if (greqs.gsr_group.ss_family != AF_INET ||
|
|
greqs.gsr_source.ss_family != AF_INET)
|
|
return -EADDRNOTAVAIL;
|
|
|
|
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) {
|
|
struct ip_mreqn mreq;
|
|
|
|
psin = (struct sockaddr_in *)&greqs.gsr_group;
|
|
mreq.imr_multiaddr = psin->sin_addr;
|
|
mreq.imr_address.s_addr = 0;
|
|
mreq.imr_ifindex = greqs.gsr_interface;
|
|
err = ip_mc_join_group_ssm(sk, &mreq, MCAST_INCLUDE);
|
|
if (err && err != -EADDRINUSE)
|
|
return err;
|
|
greqs.gsr_interface = mreq.imr_ifindex;
|
|
omode = MCAST_INCLUDE;
|
|
add = 1;
|
|
} else /* MCAST_LEAVE_SOURCE_GROUP */ {
|
|
omode = MCAST_INCLUDE;
|
|
add = 0;
|
|
}
|
|
return ip_mc_source(add, omode, sk, &mreqs, greqs.gsr_interface);
|
|
}
|
|
|
|
static int ip_set_mcast_msfilter(struct sock *sk, sockptr_t optval, int optlen)
|
|
{
|
|
struct group_filter *gsf = NULL;
|
|
int err;
|
|
|
|
if (optlen < GROUP_FILTER_SIZE(0))
|
|
return -EINVAL;
|
|
if (optlen > READ_ONCE(sysctl_optmem_max))
|
|
return -ENOBUFS;
|
|
|
|
gsf = memdup_sockptr(optval, optlen);
|
|
if (IS_ERR(gsf))
|
|
return PTR_ERR(gsf);
|
|
|
|
/* numsrc >= (4G-140)/128 overflow in 32 bits */
|
|
err = -ENOBUFS;
|
|
if (gsf->gf_numsrc >= 0x1ffffff ||
|
|
gsf->gf_numsrc > READ_ONCE(sock_net(sk)->ipv4.sysctl_igmp_max_msf))
|
|
goto out_free_gsf;
|
|
|
|
err = -EINVAL;
|
|
if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen)
|
|
goto out_free_gsf;
|
|
|
|
err = set_mcast_msfilter(sk, gsf->gf_interface, gsf->gf_numsrc,
|
|
gsf->gf_fmode, &gsf->gf_group,
|
|
gsf->gf_slist_flex);
|
|
out_free_gsf:
|
|
kfree(gsf);
|
|
return err;
|
|
}
|
|
|
|
static int compat_ip_set_mcast_msfilter(struct sock *sk, sockptr_t optval,
|
|
int optlen)
|
|
{
|
|
const int size0 = offsetof(struct compat_group_filter, gf_slist_flex);
|
|
struct compat_group_filter *gf32;
|
|
unsigned int n;
|
|
void *p;
|
|
int err;
|
|
|
|
if (optlen < size0)
|
|
return -EINVAL;
|
|
if (optlen > READ_ONCE(sysctl_optmem_max) - 4)
|
|
return -ENOBUFS;
|
|
|
|
p = kmalloc(optlen + 4, GFP_KERNEL);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
gf32 = p + 4; /* we want ->gf_group and ->gf_slist_flex aligned */
|
|
|
|
err = -EFAULT;
|
|
if (copy_from_sockptr(gf32, optval, optlen))
|
|
goto out_free_gsf;
|
|
|
|
/* numsrc >= (4G-140)/128 overflow in 32 bits */
|
|
n = gf32->gf_numsrc;
|
|
err = -ENOBUFS;
|
|
if (n >= 0x1ffffff)
|
|
goto out_free_gsf;
|
|
|
|
err = -EINVAL;
|
|
if (offsetof(struct compat_group_filter, gf_slist_flex[n]) > optlen)
|
|
goto out_free_gsf;
|
|
|
|
/* numsrc >= (4G-140)/128 overflow in 32 bits */
|
|
err = -ENOBUFS;
|
|
if (n > READ_ONCE(sock_net(sk)->ipv4.sysctl_igmp_max_msf))
|
|
goto out_free_gsf;
|
|
err = set_mcast_msfilter(sk, gf32->gf_interface, n, gf32->gf_fmode,
|
|
&gf32->gf_group, gf32->gf_slist_flex);
|
|
out_free_gsf:
|
|
kfree(p);
|
|
return err;
|
|
}
|
|
|
|
static int ip_mcast_join_leave(struct sock *sk, int optname,
|
|
sockptr_t optval, int optlen)
|
|
{
|
|
struct ip_mreqn mreq = { };
|
|
struct sockaddr_in *psin;
|
|
struct group_req greq;
|
|
|
|
if (optlen < sizeof(struct group_req))
|
|
return -EINVAL;
|
|
if (copy_from_sockptr(&greq, optval, sizeof(greq)))
|
|
return -EFAULT;
|
|
|
|
psin = (struct sockaddr_in *)&greq.gr_group;
|
|
if (psin->sin_family != AF_INET)
|
|
return -EINVAL;
|
|
mreq.imr_multiaddr = psin->sin_addr;
|
|
mreq.imr_ifindex = greq.gr_interface;
|
|
if (optname == MCAST_JOIN_GROUP)
|
|
return ip_mc_join_group(sk, &mreq);
|
|
return ip_mc_leave_group(sk, &mreq);
|
|
}
|
|
|
|
static int compat_ip_mcast_join_leave(struct sock *sk, int optname,
|
|
sockptr_t optval, int optlen)
|
|
{
|
|
struct compat_group_req greq;
|
|
struct ip_mreqn mreq = { };
|
|
struct sockaddr_in *psin;
|
|
|
|
if (optlen < sizeof(struct compat_group_req))
|
|
return -EINVAL;
|
|
if (copy_from_sockptr(&greq, optval, sizeof(greq)))
|
|
return -EFAULT;
|
|
|
|
psin = (struct sockaddr_in *)&greq.gr_group;
|
|
if (psin->sin_family != AF_INET)
|
|
return -EINVAL;
|
|
mreq.imr_multiaddr = psin->sin_addr;
|
|
mreq.imr_ifindex = greq.gr_interface;
|
|
|
|
if (optname == MCAST_JOIN_GROUP)
|
|
return ip_mc_join_group(sk, &mreq);
|
|
return ip_mc_leave_group(sk, &mreq);
|
|
}
|
|
|
|
DEFINE_STATIC_KEY_FALSE(ip4_min_ttl);
|
|
|
|
int do_ip_setsockopt(struct sock *sk, int level, int optname,
|
|
sockptr_t optval, unsigned int optlen)
|
|
{
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
struct net *net = sock_net(sk);
|
|
int val = 0, err;
|
|
bool needs_rtnl = setsockopt_needs_rtnl(optname);
|
|
|
|
switch (optname) {
|
|
case IP_PKTINFO:
|
|
case IP_RECVTTL:
|
|
case IP_RECVOPTS:
|
|
case IP_RECVTOS:
|
|
case IP_RETOPTS:
|
|
case IP_TOS:
|
|
case IP_TTL:
|
|
case IP_HDRINCL:
|
|
case IP_MTU_DISCOVER:
|
|
case IP_RECVERR:
|
|
case IP_ROUTER_ALERT:
|
|
case IP_FREEBIND:
|
|
case IP_PASSSEC:
|
|
case IP_TRANSPARENT:
|
|
case IP_MINTTL:
|
|
case IP_NODEFRAG:
|
|
case IP_BIND_ADDRESS_NO_PORT:
|
|
case IP_UNICAST_IF:
|
|
case IP_MULTICAST_TTL:
|
|
case IP_MULTICAST_ALL:
|
|
case IP_MULTICAST_LOOP:
|
|
case IP_RECVORIGDSTADDR:
|
|
case IP_CHECKSUM:
|
|
case IP_RECVFRAGSIZE:
|
|
case IP_RECVERR_RFC4884:
|
|
case IP_LOCAL_PORT_RANGE:
|
|
if (optlen >= sizeof(int)) {
|
|
if (copy_from_sockptr(&val, optval, sizeof(val)))
|
|
return -EFAULT;
|
|
} else if (optlen >= sizeof(char)) {
|
|
unsigned char ucval;
|
|
|
|
if (copy_from_sockptr(&ucval, optval, sizeof(ucval)))
|
|
return -EFAULT;
|
|
val = (int) ucval;
|
|
}
|
|
}
|
|
|
|
/* If optlen==0, it is equivalent to val == 0 */
|
|
|
|
if (optname == IP_ROUTER_ALERT)
|
|
return ip_ra_control(sk, val ? 1 : 0, NULL);
|
|
if (ip_mroute_opt(optname))
|
|
return ip_mroute_setsockopt(sk, optname, optval, optlen);
|
|
|
|
/* Handle options that can be set without locking the socket. */
|
|
switch (optname) {
|
|
case IP_PKTINFO:
|
|
inet_assign_bit(PKTINFO, sk, val);
|
|
return 0;
|
|
case IP_RECVTTL:
|
|
inet_assign_bit(TTL, sk, val);
|
|
return 0;
|
|
case IP_RECVTOS:
|
|
inet_assign_bit(TOS, sk, val);
|
|
return 0;
|
|
case IP_RECVOPTS:
|
|
inet_assign_bit(RECVOPTS, sk, val);
|
|
return 0;
|
|
case IP_RETOPTS:
|
|
inet_assign_bit(RETOPTS, sk, val);
|
|
return 0;
|
|
case IP_PASSSEC:
|
|
inet_assign_bit(PASSSEC, sk, val);
|
|
return 0;
|
|
case IP_RECVORIGDSTADDR:
|
|
inet_assign_bit(ORIGDSTADDR, sk, val);
|
|
return 0;
|
|
case IP_RECVFRAGSIZE:
|
|
if (sk->sk_type != SOCK_RAW && sk->sk_type != SOCK_DGRAM)
|
|
return -EINVAL;
|
|
inet_assign_bit(RECVFRAGSIZE, sk, val);
|
|
return 0;
|
|
case IP_RECVERR:
|
|
inet_assign_bit(RECVERR, sk, val);
|
|
if (!val)
|
|
skb_errqueue_purge(&sk->sk_error_queue);
|
|
return 0;
|
|
case IP_RECVERR_RFC4884:
|
|
if (val < 0 || val > 1)
|
|
return -EINVAL;
|
|
inet_assign_bit(RECVERR_RFC4884, sk, val);
|
|
return 0;
|
|
case IP_FREEBIND:
|
|
if (optlen < 1)
|
|
return -EINVAL;
|
|
inet_assign_bit(FREEBIND, sk, val);
|
|
return 0;
|
|
case IP_HDRINCL:
|
|
if (sk->sk_type != SOCK_RAW)
|
|
return -ENOPROTOOPT;
|
|
inet_assign_bit(HDRINCL, sk, val);
|
|
return 0;
|
|
case IP_MULTICAST_LOOP:
|
|
if (optlen < 1)
|
|
return -EINVAL;
|
|
inet_assign_bit(MC_LOOP, sk, val);
|
|
return 0;
|
|
case IP_MULTICAST_ALL:
|
|
if (optlen < 1)
|
|
return -EINVAL;
|
|
if (val != 0 && val != 1)
|
|
return -EINVAL;
|
|
inet_assign_bit(MC_ALL, sk, val);
|
|
return 0;
|
|
case IP_TRANSPARENT:
|
|
if (!!val && !sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&
|
|
!sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
if (optlen < 1)
|
|
return -EINVAL;
|
|
inet_assign_bit(TRANSPARENT, sk, val);
|
|
return 0;
|
|
case IP_NODEFRAG:
|
|
if (sk->sk_type != SOCK_RAW)
|
|
return -ENOPROTOOPT;
|
|
inet_assign_bit(NODEFRAG, sk, val);
|
|
return 0;
|
|
case IP_BIND_ADDRESS_NO_PORT:
|
|
inet_assign_bit(BIND_ADDRESS_NO_PORT, sk, val);
|
|
return 0;
|
|
case IP_TTL:
|
|
if (optlen < 1)
|
|
return -EINVAL;
|
|
if (val != -1 && (val < 1 || val > 255))
|
|
return -EINVAL;
|
|
WRITE_ONCE(inet->uc_ttl, val);
|
|
return 0;
|
|
case IP_MINTTL:
|
|
if (optlen < 1)
|
|
return -EINVAL;
|
|
if (val < 0 || val > 255)
|
|
return -EINVAL;
|
|
|
|
if (val)
|
|
static_branch_enable(&ip4_min_ttl);
|
|
|
|
WRITE_ONCE(inet->min_ttl, val);
|
|
return 0;
|
|
case IP_MULTICAST_TTL:
|
|
if (sk->sk_type == SOCK_STREAM)
|
|
return -EINVAL;
|
|
if (optlen < 1)
|
|
return -EINVAL;
|
|
if (val == -1)
|
|
val = 1;
|
|
if (val < 0 || val > 255)
|
|
return -EINVAL;
|
|
WRITE_ONCE(inet->mc_ttl, val);
|
|
return 0;
|
|
case IP_MTU_DISCOVER:
|
|
return ip_sock_set_mtu_discover(sk, val);
|
|
case IP_TOS: /* This sets both TOS and Precedence */
|
|
ip_sock_set_tos(sk, val);
|
|
return 0;
|
|
}
|
|
|
|
err = 0;
|
|
if (needs_rtnl)
|
|
rtnl_lock();
|
|
sockopt_lock_sock(sk);
|
|
|
|
switch (optname) {
|
|
case IP_OPTIONS:
|
|
{
|
|
struct ip_options_rcu *old, *opt = NULL;
|
|
|
|
if (optlen > 40)
|
|
goto e_inval;
|
|
err = ip_options_get(sock_net(sk), &opt, optval, optlen);
|
|
if (err)
|
|
break;
|
|
old = rcu_dereference_protected(inet->inet_opt,
|
|
lockdep_sock_is_held(sk));
|
|
if (inet_test_bit(IS_ICSK, sk)) {
|
|
struct inet_connection_sock *icsk = inet_csk(sk);
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
if (sk->sk_family == PF_INET ||
|
|
(!((1 << sk->sk_state) &
|
|
(TCPF_LISTEN | TCPF_CLOSE)) &&
|
|
inet->inet_daddr != LOOPBACK4_IPV6)) {
|
|
#endif
|
|
if (old)
|
|
icsk->icsk_ext_hdr_len -= old->opt.optlen;
|
|
if (opt)
|
|
icsk->icsk_ext_hdr_len += opt->opt.optlen;
|
|
icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
}
|
|
#endif
|
|
}
|
|
rcu_assign_pointer(inet->inet_opt, opt);
|
|
if (old)
|
|
kfree_rcu(old, rcu);
|
|
break;
|
|
}
|
|
case IP_CHECKSUM:
|
|
if (val) {
|
|
if (!(inet_test_bit(CHECKSUM, sk))) {
|
|
inet_inc_convert_csum(sk);
|
|
inet_set_bit(CHECKSUM, sk);
|
|
}
|
|
} else {
|
|
if (inet_test_bit(CHECKSUM, sk)) {
|
|
inet_dec_convert_csum(sk);
|
|
inet_clear_bit(CHECKSUM, sk);
|
|
}
|
|
}
|
|
break;
|
|
case IP_UNICAST_IF:
|
|
{
|
|
struct net_device *dev = NULL;
|
|
int ifindex;
|
|
int midx;
|
|
|
|
if (optlen != sizeof(int))
|
|
goto e_inval;
|
|
|
|
ifindex = (__force int)ntohl((__force __be32)val);
|
|
if (ifindex == 0) {
|
|
WRITE_ONCE(inet->uc_index, 0);
|
|
err = 0;
|
|
break;
|
|
}
|
|
|
|
dev = dev_get_by_index(sock_net(sk), ifindex);
|
|
err = -EADDRNOTAVAIL;
|
|
if (!dev)
|
|
break;
|
|
|
|
midx = l3mdev_master_ifindex(dev);
|
|
dev_put(dev);
|
|
|
|
err = -EINVAL;
|
|
if (sk->sk_bound_dev_if && midx != sk->sk_bound_dev_if)
|
|
break;
|
|
|
|
WRITE_ONCE(inet->uc_index, ifindex);
|
|
err = 0;
|
|
break;
|
|
}
|
|
case IP_MULTICAST_IF:
|
|
{
|
|
struct ip_mreqn mreq;
|
|
struct net_device *dev = NULL;
|
|
int midx;
|
|
|
|
if (sk->sk_type == SOCK_STREAM)
|
|
goto e_inval;
|
|
/*
|
|
* Check the arguments are allowable
|
|
*/
|
|
|
|
if (optlen < sizeof(struct in_addr))
|
|
goto e_inval;
|
|
|
|
err = -EFAULT;
|
|
if (optlen >= sizeof(struct ip_mreqn)) {
|
|
if (copy_from_sockptr(&mreq, optval, sizeof(mreq)))
|
|
break;
|
|
} else {
|
|
memset(&mreq, 0, sizeof(mreq));
|
|
if (optlen >= sizeof(struct ip_mreq)) {
|
|
if (copy_from_sockptr(&mreq, optval,
|
|
sizeof(struct ip_mreq)))
|
|
break;
|
|
} else if (optlen >= sizeof(struct in_addr)) {
|
|
if (copy_from_sockptr(&mreq.imr_address, optval,
|
|
sizeof(struct in_addr)))
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!mreq.imr_ifindex) {
|
|
if (mreq.imr_address.s_addr == htonl(INADDR_ANY)) {
|
|
WRITE_ONCE(inet->mc_index, 0);
|
|
WRITE_ONCE(inet->mc_addr, 0);
|
|
err = 0;
|
|
break;
|
|
}
|
|
dev = ip_dev_find(sock_net(sk), mreq.imr_address.s_addr);
|
|
if (dev)
|
|
mreq.imr_ifindex = dev->ifindex;
|
|
} else
|
|
dev = dev_get_by_index(sock_net(sk), mreq.imr_ifindex);
|
|
|
|
|
|
err = -EADDRNOTAVAIL;
|
|
if (!dev)
|
|
break;
|
|
|
|
midx = l3mdev_master_ifindex(dev);
|
|
|
|
dev_put(dev);
|
|
|
|
err = -EINVAL;
|
|
if (sk->sk_bound_dev_if &&
|
|
mreq.imr_ifindex != sk->sk_bound_dev_if &&
|
|
midx != sk->sk_bound_dev_if)
|
|
break;
|
|
|
|
WRITE_ONCE(inet->mc_index, mreq.imr_ifindex);
|
|
WRITE_ONCE(inet->mc_addr, mreq.imr_address.s_addr);
|
|
err = 0;
|
|
break;
|
|
}
|
|
|
|
case IP_ADD_MEMBERSHIP:
|
|
case IP_DROP_MEMBERSHIP:
|
|
{
|
|
struct ip_mreqn mreq;
|
|
|
|
err = -EPROTO;
|
|
if (inet_test_bit(IS_ICSK, sk))
|
|
break;
|
|
|
|
if (optlen < sizeof(struct ip_mreq))
|
|
goto e_inval;
|
|
err = -EFAULT;
|
|
if (optlen >= sizeof(struct ip_mreqn)) {
|
|
if (copy_from_sockptr(&mreq, optval, sizeof(mreq)))
|
|
break;
|
|
} else {
|
|
memset(&mreq, 0, sizeof(mreq));
|
|
if (copy_from_sockptr(&mreq, optval,
|
|
sizeof(struct ip_mreq)))
|
|
break;
|
|
}
|
|
|
|
if (optname == IP_ADD_MEMBERSHIP)
|
|
err = ip_mc_join_group(sk, &mreq);
|
|
else
|
|
err = ip_mc_leave_group(sk, &mreq);
|
|
break;
|
|
}
|
|
case IP_MSFILTER:
|
|
{
|
|
struct ip_msfilter *msf;
|
|
|
|
if (optlen < IP_MSFILTER_SIZE(0))
|
|
goto e_inval;
|
|
if (optlen > READ_ONCE(sysctl_optmem_max)) {
|
|
err = -ENOBUFS;
|
|
break;
|
|
}
|
|
msf = memdup_sockptr(optval, optlen);
|
|
if (IS_ERR(msf)) {
|
|
err = PTR_ERR(msf);
|
|
break;
|
|
}
|
|
/* numsrc >= (1G-4) overflow in 32 bits */
|
|
if (msf->imsf_numsrc >= 0x3ffffffcU ||
|
|
msf->imsf_numsrc > READ_ONCE(net->ipv4.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;
|
|
|
|
if (optlen != sizeof(struct ip_mreq_source))
|
|
goto e_inval;
|
|
if (copy_from_sockptr(&mreqs, optval, sizeof(mreqs))) {
|
|
err = -EFAULT;
|
|
break;
|
|
}
|
|
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;
|
|
|
|
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_ssm(sk, &mreq, MCAST_INCLUDE);
|
|
if (err && err != -EADDRINUSE)
|
|
break;
|
|
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:
|
|
if (in_compat_syscall())
|
|
err = compat_ip_mcast_join_leave(sk, optname, optval,
|
|
optlen);
|
|
else
|
|
err = ip_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:
|
|
err = do_mcast_group_source(sk, optname, optval, optlen);
|
|
break;
|
|
case MCAST_MSFILTER:
|
|
if (in_compat_syscall())
|
|
err = compat_ip_set_mcast_msfilter(sk, optval, optlen);
|
|
else
|
|
err = ip_set_mcast_msfilter(sk, optval, optlen);
|
|
break;
|
|
case IP_IPSEC_POLICY:
|
|
case IP_XFRM_POLICY:
|
|
err = -EPERM;
|
|
if (!sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
|
|
break;
|
|
err = xfrm_user_policy(sk, optname, optval, optlen);
|
|
break;
|
|
|
|
case IP_LOCAL_PORT_RANGE:
|
|
{
|
|
const __u16 lo = val;
|
|
const __u16 hi = val >> 16;
|
|
|
|
if (optlen != sizeof(__u32))
|
|
goto e_inval;
|
|
if (lo != 0 && hi != 0 && lo > hi)
|
|
goto e_inval;
|
|
|
|
inet->local_port_range.lo = lo;
|
|
inet->local_port_range.hi = hi;
|
|
break;
|
|
}
|
|
default:
|
|
err = -ENOPROTOOPT;
|
|
break;
|
|
}
|
|
sockopt_release_sock(sk);
|
|
if (needs_rtnl)
|
|
rtnl_unlock();
|
|
return err;
|
|
|
|
e_inval:
|
|
sockopt_release_sock(sk);
|
|
if (needs_rtnl)
|
|
rtnl_unlock();
|
|
return -EINVAL;
|
|
}
|
|
|
|
/**
|
|
* ipv4_pktinfo_prepare - transfer some info from rtable to skb
|
|
* @sk: socket
|
|
* @skb: buffer
|
|
*
|
|
* To support IP_CMSG_PKTINFO option, we store rt_iif and specific
|
|
* destination in skb->cb[] before dst drop.
|
|
* This way, receiver doesn't make cache line misses to read rtable.
|
|
*/
|
|
void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb);
|
|
bool prepare = inet_test_bit(PKTINFO, sk) ||
|
|
ipv6_sk_rxinfo(sk);
|
|
|
|
if (prepare && skb_rtable(skb)) {
|
|
/* skb->cb is overloaded: prior to this point it is IP{6}CB
|
|
* which has interface index (iif) as the first member of the
|
|
* underlying inet{6}_skb_parm struct. This code then overlays
|
|
* PKTINFO_SKB_CB and in_pktinfo also has iif as the first
|
|
* element so the iif is picked up from the prior IPCB. If iif
|
|
* is the loopback interface, then return the sending interface
|
|
* (e.g., process binds socket to eth0 for Tx which is
|
|
* redirected to loopback in the rtable/dst).
|
|
*/
|
|
struct rtable *rt = skb_rtable(skb);
|
|
bool l3slave = ipv4_l3mdev_skb(IPCB(skb)->flags);
|
|
|
|
if (pktinfo->ipi_ifindex == LOOPBACK_IFINDEX)
|
|
pktinfo->ipi_ifindex = inet_iif(skb);
|
|
else if (l3slave && rt && rt->rt_iif)
|
|
pktinfo->ipi_ifindex = rt->rt_iif;
|
|
|
|
pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb);
|
|
} else {
|
|
pktinfo->ipi_ifindex = 0;
|
|
pktinfo->ipi_spec_dst.s_addr = 0;
|
|
}
|
|
skb_dst_drop(skb);
|
|
}
|
|
|
|
int ip_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
|
|
unsigned int optlen)
|
|
{
|
|
int err;
|
|
|
|
if (level != SOL_IP)
|
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return -ENOPROTOOPT;
|
|
|
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err = do_ip_setsockopt(sk, level, optname, optval, optlen);
|
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#if IS_ENABLED(CONFIG_BPFILTER_UMH)
|
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if (optname >= BPFILTER_IPT_SO_SET_REPLACE &&
|
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optname < BPFILTER_IPT_SET_MAX)
|
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err = bpfilter_ip_set_sockopt(sk, optname, optval, optlen);
|
|
#endif
|
|
#ifdef CONFIG_NETFILTER
|
|
/* we need to exclude all possible ENOPROTOOPTs except default case */
|
|
if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
|
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optname != IP_IPSEC_POLICY &&
|
|
optname != IP_XFRM_POLICY &&
|
|
!ip_mroute_opt(optname))
|
|
err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
|
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#endif
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return err;
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}
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EXPORT_SYMBOL(ip_setsockopt);
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/*
|
|
* Get the options. Note for future reference. The GET of IP options gets
|
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* the _received_ ones. The set sets the _sent_ ones.
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*/
|
|
|
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static bool getsockopt_needs_rtnl(int optname)
|
|
{
|
|
switch (optname) {
|
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case IP_MSFILTER:
|
|
case MCAST_MSFILTER:
|
|
return true;
|
|
}
|
|
return false;
|
|
}
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|
|
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static int ip_get_mcast_msfilter(struct sock *sk, sockptr_t optval,
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|
sockptr_t optlen, int len)
|
|
{
|
|
const int size0 = offsetof(struct group_filter, gf_slist_flex);
|
|
struct group_filter gsf;
|
|
int num, gsf_size;
|
|
int err;
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|
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if (len < size0)
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|
return -EINVAL;
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|
if (copy_from_sockptr(&gsf, optval, size0))
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return -EFAULT;
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|
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num = gsf.gf_numsrc;
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err = ip_mc_gsfget(sk, &gsf, optval,
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offsetof(struct group_filter, gf_slist_flex));
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|
if (err)
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|
return err;
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if (gsf.gf_numsrc < num)
|
|
num = gsf.gf_numsrc;
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gsf_size = GROUP_FILTER_SIZE(num);
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if (copy_to_sockptr(optlen, &gsf_size, sizeof(int)) ||
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|
copy_to_sockptr(optval, &gsf, size0))
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|
return -EFAULT;
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|
return 0;
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|
}
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|
|
|
static int compat_ip_get_mcast_msfilter(struct sock *sk, sockptr_t optval,
|
|
sockptr_t optlen, int len)
|
|
{
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|
const int size0 = offsetof(struct compat_group_filter, gf_slist_flex);
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|
struct compat_group_filter gf32;
|
|
struct group_filter gf;
|
|
int num;
|
|
int err;
|
|
|
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if (len < size0)
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return -EINVAL;
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|
if (copy_from_sockptr(&gf32, optval, size0))
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return -EFAULT;
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|
|
gf.gf_interface = gf32.gf_interface;
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gf.gf_fmode = gf32.gf_fmode;
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num = gf.gf_numsrc = gf32.gf_numsrc;
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gf.gf_group = gf32.gf_group;
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|
|
|
err = ip_mc_gsfget(sk, &gf, optval,
|
|
offsetof(struct compat_group_filter, gf_slist_flex));
|
|
if (err)
|
|
return err;
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|
if (gf.gf_numsrc < num)
|
|
num = gf.gf_numsrc;
|
|
len = GROUP_FILTER_SIZE(num) - (sizeof(gf) - sizeof(gf32));
|
|
if (copy_to_sockptr(optlen, &len, sizeof(int)) ||
|
|
copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_fmode),
|
|
&gf.gf_fmode, sizeof(gf.gf_fmode)) ||
|
|
copy_to_sockptr_offset(optval, offsetof(struct compat_group_filter, gf_numsrc),
|
|
&gf.gf_numsrc, sizeof(gf.gf_numsrc)))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
|
|
int do_ip_getsockopt(struct sock *sk, int level, int optname,
|
|
sockptr_t optval, sockptr_t optlen)
|
|
{
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
bool needs_rtnl = getsockopt_needs_rtnl(optname);
|
|
int val, err = 0;
|
|
int len;
|
|
|
|
if (level != SOL_IP)
|
|
return -EOPNOTSUPP;
|
|
|
|
if (ip_mroute_opt(optname))
|
|
return ip_mroute_getsockopt(sk, optname, optval, optlen);
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|
|
|
if (copy_from_sockptr(&len, optlen, sizeof(int)))
|
|
return -EFAULT;
|
|
if (len < 0)
|
|
return -EINVAL;
|
|
|
|
/* Handle options that can be read without locking the socket. */
|
|
switch (optname) {
|
|
case IP_PKTINFO:
|
|
val = inet_test_bit(PKTINFO, sk);
|
|
goto copyval;
|
|
case IP_RECVTTL:
|
|
val = inet_test_bit(TTL, sk);
|
|
goto copyval;
|
|
case IP_RECVTOS:
|
|
val = inet_test_bit(TOS, sk);
|
|
goto copyval;
|
|
case IP_RECVOPTS:
|
|
val = inet_test_bit(RECVOPTS, sk);
|
|
goto copyval;
|
|
case IP_RETOPTS:
|
|
val = inet_test_bit(RETOPTS, sk);
|
|
goto copyval;
|
|
case IP_PASSSEC:
|
|
val = inet_test_bit(PASSSEC, sk);
|
|
goto copyval;
|
|
case IP_RECVORIGDSTADDR:
|
|
val = inet_test_bit(ORIGDSTADDR, sk);
|
|
goto copyval;
|
|
case IP_CHECKSUM:
|
|
val = inet_test_bit(CHECKSUM, sk);
|
|
goto copyval;
|
|
case IP_RECVFRAGSIZE:
|
|
val = inet_test_bit(RECVFRAGSIZE, sk);
|
|
goto copyval;
|
|
case IP_RECVERR:
|
|
val = inet_test_bit(RECVERR, sk);
|
|
goto copyval;
|
|
case IP_RECVERR_RFC4884:
|
|
val = inet_test_bit(RECVERR_RFC4884, sk);
|
|
goto copyval;
|
|
case IP_FREEBIND:
|
|
val = inet_test_bit(FREEBIND, sk);
|
|
goto copyval;
|
|
case IP_HDRINCL:
|
|
val = inet_test_bit(HDRINCL, sk);
|
|
goto copyval;
|
|
case IP_MULTICAST_LOOP:
|
|
val = inet_test_bit(MC_LOOP, sk);
|
|
goto copyval;
|
|
case IP_MULTICAST_ALL:
|
|
val = inet_test_bit(MC_ALL, sk);
|
|
goto copyval;
|
|
case IP_TRANSPARENT:
|
|
val = inet_test_bit(TRANSPARENT, sk);
|
|
goto copyval;
|
|
case IP_NODEFRAG:
|
|
val = inet_test_bit(NODEFRAG, sk);
|
|
goto copyval;
|
|
case IP_BIND_ADDRESS_NO_PORT:
|
|
val = inet_test_bit(BIND_ADDRESS_NO_PORT, sk);
|
|
goto copyval;
|
|
case IP_TTL:
|
|
val = READ_ONCE(inet->uc_ttl);
|
|
if (val < 0)
|
|
val = READ_ONCE(sock_net(sk)->ipv4.sysctl_ip_default_ttl);
|
|
goto copyval;
|
|
case IP_MINTTL:
|
|
val = READ_ONCE(inet->min_ttl);
|
|
goto copyval;
|
|
case IP_MULTICAST_TTL:
|
|
val = READ_ONCE(inet->mc_ttl);
|
|
goto copyval;
|
|
case IP_MTU_DISCOVER:
|
|
val = READ_ONCE(inet->pmtudisc);
|
|
goto copyval;
|
|
case IP_TOS:
|
|
val = READ_ONCE(inet->tos);
|
|
goto copyval;
|
|
case IP_OPTIONS:
|
|
{
|
|
unsigned char optbuf[sizeof(struct ip_options)+40];
|
|
struct ip_options *opt = (struct ip_options *)optbuf;
|
|
struct ip_options_rcu *inet_opt;
|
|
|
|
rcu_read_lock();
|
|
inet_opt = rcu_dereference(inet->inet_opt);
|
|
opt->optlen = 0;
|
|
if (inet_opt)
|
|
memcpy(optbuf, &inet_opt->opt,
|
|
sizeof(struct ip_options) +
|
|
inet_opt->opt.optlen);
|
|
rcu_read_unlock();
|
|
|
|
if (opt->optlen == 0) {
|
|
len = 0;
|
|
return copy_to_sockptr(optlen, &len, sizeof(int));
|
|
}
|
|
|
|
ip_options_undo(opt);
|
|
|
|
len = min_t(unsigned int, len, opt->optlen);
|
|
if (copy_to_sockptr(optlen, &len, sizeof(int)))
|
|
return -EFAULT;
|
|
if (copy_to_sockptr(optval, opt->__data, len))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
case IP_MTU:
|
|
{
|
|
struct dst_entry *dst;
|
|
val = 0;
|
|
dst = sk_dst_get(sk);
|
|
if (dst) {
|
|
val = dst_mtu(dst);
|
|
dst_release(dst);
|
|
}
|
|
if (!val)
|
|
return -ENOTCONN;
|
|
goto copyval;
|
|
}
|
|
case IP_PKTOPTIONS:
|
|
{
|
|
struct msghdr msg;
|
|
|
|
if (sk->sk_type != SOCK_STREAM)
|
|
return -ENOPROTOOPT;
|
|
|
|
if (optval.is_kernel) {
|
|
msg.msg_control_is_user = false;
|
|
msg.msg_control = optval.kernel;
|
|
} else {
|
|
msg.msg_control_is_user = true;
|
|
msg.msg_control_user = optval.user;
|
|
}
|
|
msg.msg_controllen = len;
|
|
msg.msg_flags = in_compat_syscall() ? MSG_CMSG_COMPAT : 0;
|
|
|
|
if (inet_test_bit(PKTINFO, sk)) {
|
|
struct in_pktinfo info;
|
|
|
|
info.ipi_addr.s_addr = READ_ONCE(inet->inet_rcv_saddr);
|
|
info.ipi_spec_dst.s_addr = READ_ONCE(inet->inet_rcv_saddr);
|
|
info.ipi_ifindex = READ_ONCE(inet->mc_index);
|
|
put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
|
|
}
|
|
if (inet_test_bit(TTL, sk)) {
|
|
int hlim = READ_ONCE(inet->mc_ttl);
|
|
|
|
put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
|
|
}
|
|
if (inet_test_bit(TOS, sk)) {
|
|
int tos = READ_ONCE(inet->rcv_tos);
|
|
put_cmsg(&msg, SOL_IP, IP_TOS, sizeof(tos), &tos);
|
|
}
|
|
len -= msg.msg_controllen;
|
|
return copy_to_sockptr(optlen, &len, sizeof(int));
|
|
}
|
|
case IP_UNICAST_IF:
|
|
val = (__force int)htonl((__u32) READ_ONCE(inet->uc_index));
|
|
goto copyval;
|
|
case IP_MULTICAST_IF:
|
|
{
|
|
struct in_addr addr;
|
|
len = min_t(unsigned int, len, sizeof(struct in_addr));
|
|
addr.s_addr = READ_ONCE(inet->mc_addr);
|
|
|
|
if (copy_to_sockptr(optlen, &len, sizeof(int)))
|
|
return -EFAULT;
|
|
if (copy_to_sockptr(optval, &addr, len))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
if (needs_rtnl)
|
|
rtnl_lock();
|
|
sockopt_lock_sock(sk);
|
|
|
|
switch (optname) {
|
|
case IP_MSFILTER:
|
|
{
|
|
struct ip_msfilter msf;
|
|
|
|
if (len < IP_MSFILTER_SIZE(0)) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
if (copy_from_sockptr(&msf, optval, IP_MSFILTER_SIZE(0))) {
|
|
err = -EFAULT;
|
|
goto out;
|
|
}
|
|
err = ip_mc_msfget(sk, &msf, optval, optlen);
|
|
goto out;
|
|
}
|
|
case MCAST_MSFILTER:
|
|
if (in_compat_syscall())
|
|
err = compat_ip_get_mcast_msfilter(sk, optval, optlen,
|
|
len);
|
|
else
|
|
err = ip_get_mcast_msfilter(sk, optval, optlen, len);
|
|
goto out;
|
|
case IP_LOCAL_PORT_RANGE:
|
|
val = inet->local_port_range.hi << 16 | inet->local_port_range.lo;
|
|
break;
|
|
case IP_PROTOCOL:
|
|
val = inet_sk(sk)->inet_num;
|
|
break;
|
|
default:
|
|
sockopt_release_sock(sk);
|
|
return -ENOPROTOOPT;
|
|
}
|
|
sockopt_release_sock(sk);
|
|
copyval:
|
|
if (len < sizeof(int) && len > 0 && val >= 0 && val <= 255) {
|
|
unsigned char ucval = (unsigned char)val;
|
|
len = 1;
|
|
if (copy_to_sockptr(optlen, &len, sizeof(int)))
|
|
return -EFAULT;
|
|
if (copy_to_sockptr(optval, &ucval, 1))
|
|
return -EFAULT;
|
|
} else {
|
|
len = min_t(unsigned int, sizeof(int), len);
|
|
if (copy_to_sockptr(optlen, &len, sizeof(int)))
|
|
return -EFAULT;
|
|
if (copy_to_sockptr(optval, &val, len))
|
|
return -EFAULT;
|
|
}
|
|
return 0;
|
|
|
|
out:
|
|
sockopt_release_sock(sk);
|
|
if (needs_rtnl)
|
|
rtnl_unlock();
|
|
return err;
|
|
}
|
|
|
|
int ip_getsockopt(struct sock *sk, int level,
|
|
int optname, char __user *optval, int __user *optlen)
|
|
{
|
|
int err;
|
|
|
|
err = do_ip_getsockopt(sk, level, optname,
|
|
USER_SOCKPTR(optval), USER_SOCKPTR(optlen));
|
|
|
|
#if IS_ENABLED(CONFIG_BPFILTER_UMH)
|
|
if (optname >= BPFILTER_IPT_SO_GET_INFO &&
|
|
optname < BPFILTER_IPT_GET_MAX)
|
|
err = bpfilter_ip_get_sockopt(sk, optname, optval, optlen);
|
|
#endif
|
|
#ifdef CONFIG_NETFILTER
|
|
/* we need to exclude all possible ENOPROTOOPTs except default case */
|
|
if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&
|
|
!ip_mroute_opt(optname)) {
|
|
int len;
|
|
|
|
if (get_user(len, optlen))
|
|
return -EFAULT;
|
|
|
|
err = nf_getsockopt(sk, PF_INET, optname, optval, &len);
|
|
if (err >= 0)
|
|
err = put_user(len, optlen);
|
|
return err;
|
|
}
|
|
#endif
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(ip_getsockopt);
|