mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-17 10:06:59 +07:00
f0c928d878
Alexei reported use after frees in inet_diag_dump_icsk() [1]
Because we use refcount_set() when various sockets are setup and
inserted into ehash, we also need to make sure inet_diag_dump_icsk()
wont race with the refcount_set() operations.
Jonathan Lemon sent a patch changing net_twsk_hashdance() but
other spots would need risky changes.
Instead, fix inet_diag_dump_icsk() as this bug came with
linux-4.10 only.
[1] Quoting Alexei :
First something iterating over sockets finds already freed tw socket:
refcount_t: increment on 0; use-after-free.
WARNING: CPU: 2 PID: 2738 at lib/refcount.c:153 refcount_inc+0x26/0x30
RIP: 0010:refcount_inc+0x26/0x30
RSP: 0018:ffffc90004c8fbc0 EFLAGS: 00010282
RAX: 000000000000002b RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88085ee9d680 RSI: ffff88085ee954c8 RDI: ffff88085ee954c8
RBP: ffff88010ecbd2c0 R08: 0000000000000000 R09: 000000000000174c
R10: ffffffff81e7c5a0 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8806ba9bf210 R14: ffffffff82304600 R15: ffff88010ecbd328
FS: 00007f81f5a7d700(0000) GS:ffff88085ee80000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f81e2a95000 CR3: 000000069b2eb006 CR4: 00000000003606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
inet_diag_dump_icsk+0x2b3/0x4e0 [inet_diag] // sock_hold(sk); in net/ipv4/inet_diag.c:1002
? kmalloc_large_node+0x37/0x70
? __kmalloc_node_track_caller+0x1cb/0x260
? __alloc_skb+0x72/0x1b0
? __kmalloc_reserve.isra.40+0x2e/0x80
__inet_diag_dump+0x3b/0x80 [inet_diag]
netlink_dump+0x116/0x2a0
netlink_recvmsg+0x205/0x3c0
sock_read_iter+0x89/0xd0
__vfs_read+0xf7/0x140
vfs_read+0x8a/0x140
SyS_read+0x3f/0xa0
do_syscall_64+0x5a/0x100
then a minute later twsk timer fires and hits two bad refcnts
for this freed socket:
refcount_t: decrement hit 0; leaking memory.
WARNING: CPU: 31 PID: 0 at lib/refcount.c:228 refcount_dec+0x2e/0x40
Modules linked in:
RIP: 0010:refcount_dec+0x2e/0x40
RSP: 0018:ffff88085f5c3ea8 EFLAGS: 00010296
RAX: 000000000000002c RBX: ffff88010ecbd2c0 RCX: 000000000000083f
RDX: 0000000000000000 RSI: 00000000000000f6 RDI: 000000000000003f
RBP: ffffc90003c77280 R08: 0000000000000000 R09: 00000000000017d3
R10: ffffffff81e7c5a0 R11: 0000000000000000 R12: ffffffff82ad2d80
R13: ffffffff8182de00 R14: ffff88085f5c3ef8 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff88085f5c0000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbe42685250 CR3: 0000000002209001 CR4: 00000000003606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
inet_twsk_kill+0x9d/0xc0 // inet_twsk_bind_unhash(tw, hashinfo);
call_timer_fn+0x29/0x110
run_timer_softirq+0x36b/0x3a0
refcount_t: underflow; use-after-free.
WARNING: CPU: 31 PID: 0 at lib/refcount.c:187 refcount_sub_and_test+0x46/0x50
RIP: 0010:refcount_sub_and_test+0x46/0x50
RSP: 0018:ffff88085f5c3eb8 EFLAGS: 00010296
RAX: 0000000000000026 RBX: ffff88010ecbd2c0 RCX: 000000000000083f
RDX: 0000000000000000 RSI: 00000000000000f6 RDI: 000000000000003f
RBP: ffff88010ecbd358 R08: 0000000000000000 R09: 000000000000185b
R10: ffffffff81e7c5a0 R11: 0000000000000000 R12: ffff88010ecbd358
R13: ffffffff8182de00 R14: ffff88085f5c3ef8 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff88085f5c0000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbe42685250 CR3: 0000000002209001 CR4: 00000000003606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
inet_twsk_put+0x12/0x20 // inet_twsk_put(tw);
call_timer_fn+0x29/0x110
run_timer_softirq+0x36b/0x3a0
Fixes: 67db3e4bfb
("tcp: no longer hold ehash lock while calling tcp_get_info()")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Alexei Starovoitov <ast@kernel.org>
Cc: Jonathan Lemon <jonathan.lemon@gmail.com>
Acked-by: Jonathan Lemon <jonathan.lemon@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
1316 lines
31 KiB
C
1316 lines
31 KiB
C
/*
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* inet_diag.c Module for monitoring INET transport protocols sockets.
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*
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* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/fcntl.h>
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#include <linux/random.h>
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#include <linux/slab.h>
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#include <linux/cache.h>
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#include <linux/init.h>
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#include <linux/time.h>
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#include <net/icmp.h>
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#include <net/tcp.h>
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#include <net/ipv6.h>
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#include <net/inet_common.h>
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#include <net/inet_connection_sock.h>
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#include <net/inet_hashtables.h>
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#include <net/inet_timewait_sock.h>
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#include <net/inet6_hashtables.h>
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#include <net/netlink.h>
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#include <linux/inet.h>
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#include <linux/stddef.h>
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#include <linux/inet_diag.h>
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#include <linux/sock_diag.h>
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static const struct inet_diag_handler **inet_diag_table;
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struct inet_diag_entry {
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const __be32 *saddr;
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const __be32 *daddr;
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u16 sport;
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u16 dport;
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u16 family;
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u16 userlocks;
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u32 ifindex;
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u32 mark;
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};
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static DEFINE_MUTEX(inet_diag_table_mutex);
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static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
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{
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if (!inet_diag_table[proto])
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sock_load_diag_module(AF_INET, proto);
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mutex_lock(&inet_diag_table_mutex);
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if (!inet_diag_table[proto])
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return ERR_PTR(-ENOENT);
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return inet_diag_table[proto];
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}
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static void inet_diag_unlock_handler(const struct inet_diag_handler *handler)
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{
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mutex_unlock(&inet_diag_table_mutex);
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}
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void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk)
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{
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r->idiag_family = sk->sk_family;
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r->id.idiag_sport = htons(sk->sk_num);
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r->id.idiag_dport = sk->sk_dport;
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r->id.idiag_if = sk->sk_bound_dev_if;
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sock_diag_save_cookie(sk, r->id.idiag_cookie);
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#if IS_ENABLED(CONFIG_IPV6)
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if (sk->sk_family == AF_INET6) {
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*(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr;
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*(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr;
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} else
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#endif
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{
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memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
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memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
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r->id.idiag_src[0] = sk->sk_rcv_saddr;
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r->id.idiag_dst[0] = sk->sk_daddr;
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}
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}
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EXPORT_SYMBOL_GPL(inet_diag_msg_common_fill);
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static size_t inet_sk_attr_size(struct sock *sk,
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const struct inet_diag_req_v2 *req,
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bool net_admin)
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{
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const struct inet_diag_handler *handler;
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size_t aux = 0;
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handler = inet_diag_table[req->sdiag_protocol];
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if (handler && handler->idiag_get_aux_size)
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aux = handler->idiag_get_aux_size(sk, net_admin);
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return nla_total_size(sizeof(struct tcp_info))
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+ nla_total_size(1) /* INET_DIAG_SHUTDOWN */
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+ nla_total_size(1) /* INET_DIAG_TOS */
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+ nla_total_size(1) /* INET_DIAG_TCLASS */
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+ nla_total_size(4) /* INET_DIAG_MARK */
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+ nla_total_size(sizeof(struct inet_diag_meminfo))
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+ nla_total_size(sizeof(struct inet_diag_msg))
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+ nla_total_size(SK_MEMINFO_VARS * sizeof(u32))
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+ nla_total_size(TCP_CA_NAME_MAX)
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+ nla_total_size(sizeof(struct tcpvegas_info))
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+ aux
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+ 64;
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}
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int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
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struct inet_diag_msg *r, int ext,
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struct user_namespace *user_ns,
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bool net_admin)
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{
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const struct inet_sock *inet = inet_sk(sk);
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if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
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goto errout;
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/* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
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* hence this needs to be included regardless of socket family.
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*/
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if (ext & (1 << (INET_DIAG_TOS - 1)))
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if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
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goto errout;
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#if IS_ENABLED(CONFIG_IPV6)
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if (r->idiag_family == AF_INET6) {
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if (ext & (1 << (INET_DIAG_TCLASS - 1)))
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if (nla_put_u8(skb, INET_DIAG_TCLASS,
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inet6_sk(sk)->tclass) < 0)
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goto errout;
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if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
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nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk)))
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goto errout;
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}
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#endif
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if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, sk->sk_mark))
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goto errout;
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r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
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r->idiag_inode = sock_i_ino(sk);
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return 0;
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errout:
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return 1;
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}
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EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill);
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int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
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struct sk_buff *skb, const struct inet_diag_req_v2 *req,
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struct user_namespace *user_ns,
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u32 portid, u32 seq, u16 nlmsg_flags,
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const struct nlmsghdr *unlh,
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bool net_admin)
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{
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const struct tcp_congestion_ops *ca_ops;
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const struct inet_diag_handler *handler;
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int ext = req->idiag_ext;
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struct inet_diag_msg *r;
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struct nlmsghdr *nlh;
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struct nlattr *attr;
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void *info = NULL;
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handler = inet_diag_table[req->sdiag_protocol];
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BUG_ON(!handler);
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nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
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nlmsg_flags);
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if (!nlh)
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return -EMSGSIZE;
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r = nlmsg_data(nlh);
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BUG_ON(!sk_fullsock(sk));
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inet_diag_msg_common_fill(r, sk);
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r->idiag_state = sk->sk_state;
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r->idiag_timer = 0;
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r->idiag_retrans = 0;
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if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns, net_admin))
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goto errout;
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if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
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struct inet_diag_meminfo minfo = {
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.idiag_rmem = sk_rmem_alloc_get(sk),
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.idiag_wmem = sk->sk_wmem_queued,
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.idiag_fmem = sk->sk_forward_alloc,
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.idiag_tmem = sk_wmem_alloc_get(sk),
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};
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if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
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goto errout;
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}
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if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
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if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
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goto errout;
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/*
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* RAW sockets might have user-defined protocols assigned,
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* so report the one supplied on socket creation.
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*/
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if (sk->sk_type == SOCK_RAW) {
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if (nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))
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goto errout;
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}
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if (!icsk) {
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handler->idiag_get_info(sk, r, NULL);
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goto out;
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}
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if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
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icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT ||
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icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
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r->idiag_timer = 1;
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r->idiag_retrans = icsk->icsk_retransmits;
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r->idiag_expires =
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jiffies_to_msecs(icsk->icsk_timeout - jiffies);
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} else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
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r->idiag_timer = 4;
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r->idiag_retrans = icsk->icsk_probes_out;
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r->idiag_expires =
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jiffies_to_msecs(icsk->icsk_timeout - jiffies);
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} else if (timer_pending(&sk->sk_timer)) {
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r->idiag_timer = 2;
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r->idiag_retrans = icsk->icsk_probes_out;
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r->idiag_expires =
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jiffies_to_msecs(sk->sk_timer.expires - jiffies);
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} else {
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r->idiag_timer = 0;
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r->idiag_expires = 0;
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}
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if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
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attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
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handler->idiag_info_size,
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INET_DIAG_PAD);
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if (!attr)
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goto errout;
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info = nla_data(attr);
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}
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if (ext & (1 << (INET_DIAG_CONG - 1))) {
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int err = 0;
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rcu_read_lock();
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ca_ops = READ_ONCE(icsk->icsk_ca_ops);
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if (ca_ops)
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err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
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rcu_read_unlock();
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if (err < 0)
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goto errout;
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}
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handler->idiag_get_info(sk, r, info);
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if (ext & (1 << (INET_DIAG_INFO - 1)) && handler->idiag_get_aux)
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if (handler->idiag_get_aux(sk, net_admin, skb) < 0)
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goto errout;
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if (sk->sk_state < TCP_TIME_WAIT) {
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union tcp_cc_info info;
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size_t sz = 0;
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int attr;
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rcu_read_lock();
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ca_ops = READ_ONCE(icsk->icsk_ca_ops);
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if (ca_ops && ca_ops->get_info)
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sz = ca_ops->get_info(sk, ext, &attr, &info);
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rcu_read_unlock();
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if (sz && nla_put(skb, attr, sz, &info) < 0)
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goto errout;
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}
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if (ext & (1 << (INET_DIAG_CLASS_ID - 1))) {
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u32 classid = 0;
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#ifdef CONFIG_SOCK_CGROUP_DATA
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classid = sock_cgroup_classid(&sk->sk_cgrp_data);
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#endif
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if (nla_put_u32(skb, INET_DIAG_CLASS_ID, classid))
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goto errout;
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}
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out:
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nlmsg_end(skb, nlh);
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return 0;
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errout:
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nlmsg_cancel(skb, nlh);
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return -EMSGSIZE;
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}
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EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
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static int inet_csk_diag_fill(struct sock *sk,
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struct sk_buff *skb,
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const struct inet_diag_req_v2 *req,
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struct user_namespace *user_ns,
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u32 portid, u32 seq, u16 nlmsg_flags,
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const struct nlmsghdr *unlh,
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bool net_admin)
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{
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return inet_sk_diag_fill(sk, inet_csk(sk), skb, req, user_ns,
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portid, seq, nlmsg_flags, unlh, net_admin);
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}
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static int inet_twsk_diag_fill(struct sock *sk,
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struct sk_buff *skb,
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u32 portid, u32 seq, u16 nlmsg_flags,
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const struct nlmsghdr *unlh)
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{
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struct inet_timewait_sock *tw = inet_twsk(sk);
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struct inet_diag_msg *r;
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struct nlmsghdr *nlh;
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long tmo;
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nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
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nlmsg_flags);
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if (!nlh)
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return -EMSGSIZE;
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r = nlmsg_data(nlh);
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BUG_ON(tw->tw_state != TCP_TIME_WAIT);
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tmo = tw->tw_timer.expires - jiffies;
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if (tmo < 0)
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tmo = 0;
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inet_diag_msg_common_fill(r, sk);
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r->idiag_retrans = 0;
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r->idiag_state = tw->tw_substate;
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r->idiag_timer = 3;
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r->idiag_expires = jiffies_to_msecs(tmo);
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r->idiag_rqueue = 0;
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r->idiag_wqueue = 0;
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r->idiag_uid = 0;
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r->idiag_inode = 0;
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nlmsg_end(skb, nlh);
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return 0;
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}
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|
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static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
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u32 portid, u32 seq, u16 nlmsg_flags,
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const struct nlmsghdr *unlh, bool net_admin)
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{
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struct request_sock *reqsk = inet_reqsk(sk);
|
|
struct inet_diag_msg *r;
|
|
struct nlmsghdr *nlh;
|
|
long tmo;
|
|
|
|
nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
|
|
nlmsg_flags);
|
|
if (!nlh)
|
|
return -EMSGSIZE;
|
|
|
|
r = nlmsg_data(nlh);
|
|
inet_diag_msg_common_fill(r, sk);
|
|
r->idiag_state = TCP_SYN_RECV;
|
|
r->idiag_timer = 1;
|
|
r->idiag_retrans = reqsk->num_retrans;
|
|
|
|
BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
|
|
offsetof(struct sock, sk_cookie));
|
|
|
|
tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
|
|
r->idiag_expires = (tmo >= 0) ? jiffies_to_msecs(tmo) : 0;
|
|
r->idiag_rqueue = 0;
|
|
r->idiag_wqueue = 0;
|
|
r->idiag_uid = 0;
|
|
r->idiag_inode = 0;
|
|
|
|
if (net_admin && nla_put_u32(skb, INET_DIAG_MARK,
|
|
inet_rsk(reqsk)->ir_mark))
|
|
return -EMSGSIZE;
|
|
|
|
nlmsg_end(skb, nlh);
|
|
return 0;
|
|
}
|
|
|
|
static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
|
|
const struct inet_diag_req_v2 *r,
|
|
struct user_namespace *user_ns,
|
|
u32 portid, u32 seq, u16 nlmsg_flags,
|
|
const struct nlmsghdr *unlh, bool net_admin)
|
|
{
|
|
if (sk->sk_state == TCP_TIME_WAIT)
|
|
return inet_twsk_diag_fill(sk, skb, portid, seq,
|
|
nlmsg_flags, unlh);
|
|
|
|
if (sk->sk_state == TCP_NEW_SYN_RECV)
|
|
return inet_req_diag_fill(sk, skb, portid, seq,
|
|
nlmsg_flags, unlh, net_admin);
|
|
|
|
return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
|
|
nlmsg_flags, unlh, net_admin);
|
|
}
|
|
|
|
struct sock *inet_diag_find_one_icsk(struct net *net,
|
|
struct inet_hashinfo *hashinfo,
|
|
const struct inet_diag_req_v2 *req)
|
|
{
|
|
struct sock *sk;
|
|
|
|
rcu_read_lock();
|
|
if (req->sdiag_family == AF_INET)
|
|
sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
|
|
req->id.idiag_dport, req->id.idiag_src[0],
|
|
req->id.idiag_sport, req->id.idiag_if);
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
else if (req->sdiag_family == AF_INET6) {
|
|
if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
|
|
ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
|
|
sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3],
|
|
req->id.idiag_dport, req->id.idiag_src[3],
|
|
req->id.idiag_sport, req->id.idiag_if);
|
|
else
|
|
sk = inet6_lookup(net, hashinfo, NULL, 0,
|
|
(struct in6_addr *)req->id.idiag_dst,
|
|
req->id.idiag_dport,
|
|
(struct in6_addr *)req->id.idiag_src,
|
|
req->id.idiag_sport,
|
|
req->id.idiag_if);
|
|
}
|
|
#endif
|
|
else {
|
|
rcu_read_unlock();
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
rcu_read_unlock();
|
|
if (!sk)
|
|
return ERR_PTR(-ENOENT);
|
|
|
|
if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
|
|
sock_gen_put(sk);
|
|
return ERR_PTR(-ENOENT);
|
|
}
|
|
|
|
return sk;
|
|
}
|
|
EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
|
|
|
|
int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
|
|
struct sk_buff *in_skb,
|
|
const struct nlmsghdr *nlh,
|
|
const struct inet_diag_req_v2 *req)
|
|
{
|
|
bool net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN);
|
|
struct net *net = sock_net(in_skb->sk);
|
|
struct sk_buff *rep;
|
|
struct sock *sk;
|
|
int err;
|
|
|
|
sk = inet_diag_find_one_icsk(net, hashinfo, req);
|
|
if (IS_ERR(sk))
|
|
return PTR_ERR(sk);
|
|
|
|
rep = nlmsg_new(inet_sk_attr_size(sk, req, net_admin), GFP_KERNEL);
|
|
if (!rep) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
err = sk_diag_fill(sk, rep, req,
|
|
sk_user_ns(NETLINK_CB(in_skb).sk),
|
|
NETLINK_CB(in_skb).portid,
|
|
nlh->nlmsg_seq, 0, nlh, net_admin);
|
|
if (err < 0) {
|
|
WARN_ON(err == -EMSGSIZE);
|
|
nlmsg_free(rep);
|
|
goto out;
|
|
}
|
|
err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
|
|
MSG_DONTWAIT);
|
|
if (err > 0)
|
|
err = 0;
|
|
|
|
out:
|
|
if (sk)
|
|
sock_gen_put(sk);
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
|
|
|
|
static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
|
|
const struct nlmsghdr *nlh,
|
|
const struct inet_diag_req_v2 *req)
|
|
{
|
|
const struct inet_diag_handler *handler;
|
|
int err;
|
|
|
|
handler = inet_diag_lock_handler(req->sdiag_protocol);
|
|
if (IS_ERR(handler))
|
|
err = PTR_ERR(handler);
|
|
else if (cmd == SOCK_DIAG_BY_FAMILY)
|
|
err = handler->dump_one(in_skb, nlh, req);
|
|
else if (cmd == SOCK_DESTROY && handler->destroy)
|
|
err = handler->destroy(in_skb, req);
|
|
else
|
|
err = -EOPNOTSUPP;
|
|
inet_diag_unlock_handler(handler);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
|
|
{
|
|
int words = bits >> 5;
|
|
|
|
bits &= 0x1f;
|
|
|
|
if (words) {
|
|
if (memcmp(a1, a2, words << 2))
|
|
return 0;
|
|
}
|
|
if (bits) {
|
|
__be32 w1, w2;
|
|
__be32 mask;
|
|
|
|
w1 = a1[words];
|
|
w2 = a2[words];
|
|
|
|
mask = htonl((0xffffffff) << (32 - bits));
|
|
|
|
if ((w1 ^ w2) & mask)
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int inet_diag_bc_run(const struct nlattr *_bc,
|
|
const struct inet_diag_entry *entry)
|
|
{
|
|
const void *bc = nla_data(_bc);
|
|
int len = nla_len(_bc);
|
|
|
|
while (len > 0) {
|
|
int yes = 1;
|
|
const struct inet_diag_bc_op *op = bc;
|
|
|
|
switch (op->code) {
|
|
case INET_DIAG_BC_NOP:
|
|
break;
|
|
case INET_DIAG_BC_JMP:
|
|
yes = 0;
|
|
break;
|
|
case INET_DIAG_BC_S_EQ:
|
|
yes = entry->sport == op[1].no;
|
|
break;
|
|
case INET_DIAG_BC_S_GE:
|
|
yes = entry->sport >= op[1].no;
|
|
break;
|
|
case INET_DIAG_BC_S_LE:
|
|
yes = entry->sport <= op[1].no;
|
|
break;
|
|
case INET_DIAG_BC_D_EQ:
|
|
yes = entry->dport == op[1].no;
|
|
break;
|
|
case INET_DIAG_BC_D_GE:
|
|
yes = entry->dport >= op[1].no;
|
|
break;
|
|
case INET_DIAG_BC_D_LE:
|
|
yes = entry->dport <= op[1].no;
|
|
break;
|
|
case INET_DIAG_BC_AUTO:
|
|
yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
|
|
break;
|
|
case INET_DIAG_BC_S_COND:
|
|
case INET_DIAG_BC_D_COND: {
|
|
const struct inet_diag_hostcond *cond;
|
|
const __be32 *addr;
|
|
|
|
cond = (const struct inet_diag_hostcond *)(op + 1);
|
|
if (cond->port != -1 &&
|
|
cond->port != (op->code == INET_DIAG_BC_S_COND ?
|
|
entry->sport : entry->dport)) {
|
|
yes = 0;
|
|
break;
|
|
}
|
|
|
|
if (op->code == INET_DIAG_BC_S_COND)
|
|
addr = entry->saddr;
|
|
else
|
|
addr = entry->daddr;
|
|
|
|
if (cond->family != AF_UNSPEC &&
|
|
cond->family != entry->family) {
|
|
if (entry->family == AF_INET6 &&
|
|
cond->family == AF_INET) {
|
|
if (addr[0] == 0 && addr[1] == 0 &&
|
|
addr[2] == htonl(0xffff) &&
|
|
bitstring_match(addr + 3,
|
|
cond->addr,
|
|
cond->prefix_len))
|
|
break;
|
|
}
|
|
yes = 0;
|
|
break;
|
|
}
|
|
|
|
if (cond->prefix_len == 0)
|
|
break;
|
|
if (bitstring_match(addr, cond->addr,
|
|
cond->prefix_len))
|
|
break;
|
|
yes = 0;
|
|
break;
|
|
}
|
|
case INET_DIAG_BC_DEV_COND: {
|
|
u32 ifindex;
|
|
|
|
ifindex = *((const u32 *)(op + 1));
|
|
if (ifindex != entry->ifindex)
|
|
yes = 0;
|
|
break;
|
|
}
|
|
case INET_DIAG_BC_MARK_COND: {
|
|
struct inet_diag_markcond *cond;
|
|
|
|
cond = (struct inet_diag_markcond *)(op + 1);
|
|
if ((entry->mark & cond->mask) != cond->mark)
|
|
yes = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (yes) {
|
|
len -= op->yes;
|
|
bc += op->yes;
|
|
} else {
|
|
len -= op->no;
|
|
bc += op->no;
|
|
}
|
|
}
|
|
return len == 0;
|
|
}
|
|
|
|
/* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
|
|
*/
|
|
static void entry_fill_addrs(struct inet_diag_entry *entry,
|
|
const struct sock *sk)
|
|
{
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
if (sk->sk_family == AF_INET6) {
|
|
entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
|
|
entry->daddr = sk->sk_v6_daddr.s6_addr32;
|
|
} else
|
|
#endif
|
|
{
|
|
entry->saddr = &sk->sk_rcv_saddr;
|
|
entry->daddr = &sk->sk_daddr;
|
|
}
|
|
}
|
|
|
|
int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
|
|
{
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
struct inet_diag_entry entry;
|
|
|
|
if (!bc)
|
|
return 1;
|
|
|
|
entry.family = sk->sk_family;
|
|
entry_fill_addrs(&entry, sk);
|
|
entry.sport = inet->inet_num;
|
|
entry.dport = ntohs(inet->inet_dport);
|
|
entry.ifindex = sk->sk_bound_dev_if;
|
|
entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
|
|
if (sk_fullsock(sk))
|
|
entry.mark = sk->sk_mark;
|
|
else if (sk->sk_state == TCP_NEW_SYN_RECV)
|
|
entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark;
|
|
else
|
|
entry.mark = 0;
|
|
|
|
return inet_diag_bc_run(bc, &entry);
|
|
}
|
|
EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
|
|
|
|
static int valid_cc(const void *bc, int len, int cc)
|
|
{
|
|
while (len >= 0) {
|
|
const struct inet_diag_bc_op *op = bc;
|
|
|
|
if (cc > len)
|
|
return 0;
|
|
if (cc == len)
|
|
return 1;
|
|
if (op->yes < 4 || op->yes & 3)
|
|
return 0;
|
|
len -= op->yes;
|
|
bc += op->yes;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* data is u32 ifindex */
|
|
static bool valid_devcond(const struct inet_diag_bc_op *op, int len,
|
|
int *min_len)
|
|
{
|
|
/* Check ifindex space. */
|
|
*min_len += sizeof(u32);
|
|
if (len < *min_len)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
/* Validate an inet_diag_hostcond. */
|
|
static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
|
|
int *min_len)
|
|
{
|
|
struct inet_diag_hostcond *cond;
|
|
int addr_len;
|
|
|
|
/* Check hostcond space. */
|
|
*min_len += sizeof(struct inet_diag_hostcond);
|
|
if (len < *min_len)
|
|
return false;
|
|
cond = (struct inet_diag_hostcond *)(op + 1);
|
|
|
|
/* Check address family and address length. */
|
|
switch (cond->family) {
|
|
case AF_UNSPEC:
|
|
addr_len = 0;
|
|
break;
|
|
case AF_INET:
|
|
addr_len = sizeof(struct in_addr);
|
|
break;
|
|
case AF_INET6:
|
|
addr_len = sizeof(struct in6_addr);
|
|
break;
|
|
default:
|
|
return false;
|
|
}
|
|
*min_len += addr_len;
|
|
if (len < *min_len)
|
|
return false;
|
|
|
|
/* Check prefix length (in bits) vs address length (in bytes). */
|
|
if (cond->prefix_len > 8 * addr_len)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
/* Validate a port comparison operator. */
|
|
static bool valid_port_comparison(const struct inet_diag_bc_op *op,
|
|
int len, int *min_len)
|
|
{
|
|
/* Port comparisons put the port in a follow-on inet_diag_bc_op. */
|
|
*min_len += sizeof(struct inet_diag_bc_op);
|
|
if (len < *min_len)
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
static bool valid_markcond(const struct inet_diag_bc_op *op, int len,
|
|
int *min_len)
|
|
{
|
|
*min_len += sizeof(struct inet_diag_markcond);
|
|
return len >= *min_len;
|
|
}
|
|
|
|
static int inet_diag_bc_audit(const struct nlattr *attr,
|
|
const struct sk_buff *skb)
|
|
{
|
|
bool net_admin = netlink_net_capable(skb, CAP_NET_ADMIN);
|
|
const void *bytecode, *bc;
|
|
int bytecode_len, len;
|
|
|
|
if (!attr || nla_len(attr) < sizeof(struct inet_diag_bc_op))
|
|
return -EINVAL;
|
|
|
|
bytecode = bc = nla_data(attr);
|
|
len = bytecode_len = nla_len(attr);
|
|
|
|
while (len > 0) {
|
|
int min_len = sizeof(struct inet_diag_bc_op);
|
|
const struct inet_diag_bc_op *op = bc;
|
|
|
|
switch (op->code) {
|
|
case INET_DIAG_BC_S_COND:
|
|
case INET_DIAG_BC_D_COND:
|
|
if (!valid_hostcond(bc, len, &min_len))
|
|
return -EINVAL;
|
|
break;
|
|
case INET_DIAG_BC_DEV_COND:
|
|
if (!valid_devcond(bc, len, &min_len))
|
|
return -EINVAL;
|
|
break;
|
|
case INET_DIAG_BC_S_EQ:
|
|
case INET_DIAG_BC_S_GE:
|
|
case INET_DIAG_BC_S_LE:
|
|
case INET_DIAG_BC_D_EQ:
|
|
case INET_DIAG_BC_D_GE:
|
|
case INET_DIAG_BC_D_LE:
|
|
if (!valid_port_comparison(bc, len, &min_len))
|
|
return -EINVAL;
|
|
break;
|
|
case INET_DIAG_BC_MARK_COND:
|
|
if (!net_admin)
|
|
return -EPERM;
|
|
if (!valid_markcond(bc, len, &min_len))
|
|
return -EINVAL;
|
|
break;
|
|
case INET_DIAG_BC_AUTO:
|
|
case INET_DIAG_BC_JMP:
|
|
case INET_DIAG_BC_NOP:
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (op->code != INET_DIAG_BC_NOP) {
|
|
if (op->no < min_len || op->no > len + 4 || op->no & 3)
|
|
return -EINVAL;
|
|
if (op->no < len &&
|
|
!valid_cc(bytecode, bytecode_len, len - op->no))
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
|
|
return -EINVAL;
|
|
bc += op->yes;
|
|
len -= op->yes;
|
|
}
|
|
return len == 0 ? 0 : -EINVAL;
|
|
}
|
|
|
|
static int inet_csk_diag_dump(struct sock *sk,
|
|
struct sk_buff *skb,
|
|
struct netlink_callback *cb,
|
|
const struct inet_diag_req_v2 *r,
|
|
const struct nlattr *bc,
|
|
bool net_admin)
|
|
{
|
|
if (!inet_diag_bc_sk(bc, sk))
|
|
return 0;
|
|
|
|
return inet_csk_diag_fill(sk, skb, r,
|
|
sk_user_ns(NETLINK_CB(cb->skb).sk),
|
|
NETLINK_CB(cb->skb).portid,
|
|
cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh,
|
|
net_admin);
|
|
}
|
|
|
|
static void twsk_build_assert(void)
|
|
{
|
|
BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
|
|
offsetof(struct sock, sk_family));
|
|
|
|
BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
|
|
offsetof(struct inet_sock, inet_num));
|
|
|
|
BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
|
|
offsetof(struct inet_sock, inet_dport));
|
|
|
|
BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
|
|
offsetof(struct inet_sock, inet_rcv_saddr));
|
|
|
|
BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
|
|
offsetof(struct inet_sock, inet_daddr));
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
|
|
offsetof(struct sock, sk_v6_rcv_saddr));
|
|
|
|
BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
|
|
offsetof(struct sock, sk_v6_daddr));
|
|
#endif
|
|
}
|
|
|
|
void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
|
|
struct netlink_callback *cb,
|
|
const struct inet_diag_req_v2 *r, struct nlattr *bc)
|
|
{
|
|
bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
|
|
struct net *net = sock_net(skb->sk);
|
|
u32 idiag_states = r->idiag_states;
|
|
int i, num, s_i, s_num;
|
|
struct sock *sk;
|
|
|
|
if (idiag_states & TCPF_SYN_RECV)
|
|
idiag_states |= TCPF_NEW_SYN_RECV;
|
|
s_i = cb->args[1];
|
|
s_num = num = cb->args[2];
|
|
|
|
if (cb->args[0] == 0) {
|
|
if (!(idiag_states & TCPF_LISTEN) || r->id.idiag_dport)
|
|
goto skip_listen_ht;
|
|
|
|
for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
|
|
struct inet_listen_hashbucket *ilb;
|
|
|
|
num = 0;
|
|
ilb = &hashinfo->listening_hash[i];
|
|
spin_lock(&ilb->lock);
|
|
sk_for_each(sk, &ilb->head) {
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
|
|
if (!net_eq(sock_net(sk), net))
|
|
continue;
|
|
|
|
if (num < s_num) {
|
|
num++;
|
|
continue;
|
|
}
|
|
|
|
if (r->sdiag_family != AF_UNSPEC &&
|
|
sk->sk_family != r->sdiag_family)
|
|
goto next_listen;
|
|
|
|
if (r->id.idiag_sport != inet->inet_sport &&
|
|
r->id.idiag_sport)
|
|
goto next_listen;
|
|
|
|
if (inet_csk_diag_dump(sk, skb, cb, r,
|
|
bc, net_admin) < 0) {
|
|
spin_unlock(&ilb->lock);
|
|
goto done;
|
|
}
|
|
|
|
next_listen:
|
|
++num;
|
|
}
|
|
spin_unlock(&ilb->lock);
|
|
|
|
s_num = 0;
|
|
}
|
|
skip_listen_ht:
|
|
cb->args[0] = 1;
|
|
s_i = num = s_num = 0;
|
|
}
|
|
|
|
if (!(idiag_states & ~TCPF_LISTEN))
|
|
goto out;
|
|
|
|
#define SKARR_SZ 16
|
|
for (i = s_i; i <= hashinfo->ehash_mask; i++) {
|
|
struct inet_ehash_bucket *head = &hashinfo->ehash[i];
|
|
spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
|
|
struct hlist_nulls_node *node;
|
|
struct sock *sk_arr[SKARR_SZ];
|
|
int num_arr[SKARR_SZ];
|
|
int idx, accum, res;
|
|
|
|
if (hlist_nulls_empty(&head->chain))
|
|
continue;
|
|
|
|
if (i > s_i)
|
|
s_num = 0;
|
|
|
|
next_chunk:
|
|
num = 0;
|
|
accum = 0;
|
|
spin_lock_bh(lock);
|
|
sk_nulls_for_each(sk, node, &head->chain) {
|
|
int state;
|
|
|
|
if (!net_eq(sock_net(sk), net))
|
|
continue;
|
|
if (num < s_num)
|
|
goto next_normal;
|
|
state = (sk->sk_state == TCP_TIME_WAIT) ?
|
|
inet_twsk(sk)->tw_substate : sk->sk_state;
|
|
if (!(idiag_states & (1 << state)))
|
|
goto next_normal;
|
|
if (r->sdiag_family != AF_UNSPEC &&
|
|
sk->sk_family != r->sdiag_family)
|
|
goto next_normal;
|
|
if (r->id.idiag_sport != htons(sk->sk_num) &&
|
|
r->id.idiag_sport)
|
|
goto next_normal;
|
|
if (r->id.idiag_dport != sk->sk_dport &&
|
|
r->id.idiag_dport)
|
|
goto next_normal;
|
|
twsk_build_assert();
|
|
|
|
if (!inet_diag_bc_sk(bc, sk))
|
|
goto next_normal;
|
|
|
|
if (!refcount_inc_not_zero(&sk->sk_refcnt))
|
|
goto next_normal;
|
|
|
|
num_arr[accum] = num;
|
|
sk_arr[accum] = sk;
|
|
if (++accum == SKARR_SZ)
|
|
break;
|
|
next_normal:
|
|
++num;
|
|
}
|
|
spin_unlock_bh(lock);
|
|
res = 0;
|
|
for (idx = 0; idx < accum; idx++) {
|
|
if (res >= 0) {
|
|
res = sk_diag_fill(sk_arr[idx], skb, r,
|
|
sk_user_ns(NETLINK_CB(cb->skb).sk),
|
|
NETLINK_CB(cb->skb).portid,
|
|
cb->nlh->nlmsg_seq, NLM_F_MULTI,
|
|
cb->nlh, net_admin);
|
|
if (res < 0)
|
|
num = num_arr[idx];
|
|
}
|
|
sock_gen_put(sk_arr[idx]);
|
|
}
|
|
if (res < 0)
|
|
break;
|
|
cond_resched();
|
|
if (accum == SKARR_SZ) {
|
|
s_num = num + 1;
|
|
goto next_chunk;
|
|
}
|
|
}
|
|
|
|
done:
|
|
cb->args[1] = i;
|
|
cb->args[2] = num;
|
|
out:
|
|
;
|
|
}
|
|
EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
|
|
|
|
static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
|
|
const struct inet_diag_req_v2 *r,
|
|
struct nlattr *bc)
|
|
{
|
|
const struct inet_diag_handler *handler;
|
|
int err = 0;
|
|
|
|
handler = inet_diag_lock_handler(r->sdiag_protocol);
|
|
if (!IS_ERR(handler))
|
|
handler->dump(skb, cb, r, bc);
|
|
else
|
|
err = PTR_ERR(handler);
|
|
inet_diag_unlock_handler(handler);
|
|
|
|
return err ? : skb->len;
|
|
}
|
|
|
|
static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
int hdrlen = sizeof(struct inet_diag_req_v2);
|
|
struct nlattr *bc = NULL;
|
|
|
|
if (nlmsg_attrlen(cb->nlh, hdrlen))
|
|
bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
|
|
|
|
return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
|
|
}
|
|
|
|
static int inet_diag_type2proto(int type)
|
|
{
|
|
switch (type) {
|
|
case TCPDIAG_GETSOCK:
|
|
return IPPROTO_TCP;
|
|
case DCCPDIAG_GETSOCK:
|
|
return IPPROTO_DCCP;
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static int inet_diag_dump_compat(struct sk_buff *skb,
|
|
struct netlink_callback *cb)
|
|
{
|
|
struct inet_diag_req *rc = nlmsg_data(cb->nlh);
|
|
int hdrlen = sizeof(struct inet_diag_req);
|
|
struct inet_diag_req_v2 req;
|
|
struct nlattr *bc = NULL;
|
|
|
|
req.sdiag_family = AF_UNSPEC; /* compatibility */
|
|
req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
|
|
req.idiag_ext = rc->idiag_ext;
|
|
req.idiag_states = rc->idiag_states;
|
|
req.id = rc->id;
|
|
|
|
if (nlmsg_attrlen(cb->nlh, hdrlen))
|
|
bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
|
|
|
|
return __inet_diag_dump(skb, cb, &req, bc);
|
|
}
|
|
|
|
static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
|
|
const struct nlmsghdr *nlh)
|
|
{
|
|
struct inet_diag_req *rc = nlmsg_data(nlh);
|
|
struct inet_diag_req_v2 req;
|
|
|
|
req.sdiag_family = rc->idiag_family;
|
|
req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
|
|
req.idiag_ext = rc->idiag_ext;
|
|
req.idiag_states = rc->idiag_states;
|
|
req.id = rc->id;
|
|
|
|
return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, &req);
|
|
}
|
|
|
|
static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
|
|
{
|
|
int hdrlen = sizeof(struct inet_diag_req);
|
|
struct net *net = sock_net(skb->sk);
|
|
|
|
if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
|
|
nlmsg_len(nlh) < hdrlen)
|
|
return -EINVAL;
|
|
|
|
if (nlh->nlmsg_flags & NLM_F_DUMP) {
|
|
if (nlmsg_attrlen(nlh, hdrlen)) {
|
|
struct nlattr *attr;
|
|
int err;
|
|
|
|
attr = nlmsg_find_attr(nlh, hdrlen,
|
|
INET_DIAG_REQ_BYTECODE);
|
|
err = inet_diag_bc_audit(attr, skb);
|
|
if (err)
|
|
return err;
|
|
}
|
|
{
|
|
struct netlink_dump_control c = {
|
|
.dump = inet_diag_dump_compat,
|
|
};
|
|
return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
|
|
}
|
|
}
|
|
|
|
return inet_diag_get_exact_compat(skb, nlh);
|
|
}
|
|
|
|
static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
|
|
{
|
|
int hdrlen = sizeof(struct inet_diag_req_v2);
|
|
struct net *net = sock_net(skb->sk);
|
|
|
|
if (nlmsg_len(h) < hdrlen)
|
|
return -EINVAL;
|
|
|
|
if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
|
|
h->nlmsg_flags & NLM_F_DUMP) {
|
|
if (nlmsg_attrlen(h, hdrlen)) {
|
|
struct nlattr *attr;
|
|
int err;
|
|
|
|
attr = nlmsg_find_attr(h, hdrlen,
|
|
INET_DIAG_REQ_BYTECODE);
|
|
err = inet_diag_bc_audit(attr, skb);
|
|
if (err)
|
|
return err;
|
|
}
|
|
{
|
|
struct netlink_dump_control c = {
|
|
.dump = inet_diag_dump,
|
|
};
|
|
return netlink_dump_start(net->diag_nlsk, skb, h, &c);
|
|
}
|
|
}
|
|
|
|
return inet_diag_cmd_exact(h->nlmsg_type, skb, h, nlmsg_data(h));
|
|
}
|
|
|
|
static
|
|
int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
|
|
{
|
|
const struct inet_diag_handler *handler;
|
|
struct nlmsghdr *nlh;
|
|
struct nlattr *attr;
|
|
struct inet_diag_msg *r;
|
|
void *info = NULL;
|
|
int err = 0;
|
|
|
|
nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
|
|
if (!nlh)
|
|
return -ENOMEM;
|
|
|
|
r = nlmsg_data(nlh);
|
|
memset(r, 0, sizeof(*r));
|
|
inet_diag_msg_common_fill(r, sk);
|
|
if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
|
|
r->id.idiag_sport = inet_sk(sk)->inet_sport;
|
|
r->idiag_state = sk->sk_state;
|
|
|
|
if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
|
|
nlmsg_cancel(skb, nlh);
|
|
return err;
|
|
}
|
|
|
|
handler = inet_diag_lock_handler(sk->sk_protocol);
|
|
if (IS_ERR(handler)) {
|
|
inet_diag_unlock_handler(handler);
|
|
nlmsg_cancel(skb, nlh);
|
|
return PTR_ERR(handler);
|
|
}
|
|
|
|
attr = handler->idiag_info_size
|
|
? nla_reserve_64bit(skb, INET_DIAG_INFO,
|
|
handler->idiag_info_size,
|
|
INET_DIAG_PAD)
|
|
: NULL;
|
|
if (attr)
|
|
info = nla_data(attr);
|
|
|
|
handler->idiag_get_info(sk, r, info);
|
|
inet_diag_unlock_handler(handler);
|
|
|
|
nlmsg_end(skb, nlh);
|
|
return 0;
|
|
}
|
|
|
|
static const struct sock_diag_handler inet_diag_handler = {
|
|
.family = AF_INET,
|
|
.dump = inet_diag_handler_cmd,
|
|
.get_info = inet_diag_handler_get_info,
|
|
.destroy = inet_diag_handler_cmd,
|
|
};
|
|
|
|
static const struct sock_diag_handler inet6_diag_handler = {
|
|
.family = AF_INET6,
|
|
.dump = inet_diag_handler_cmd,
|
|
.get_info = inet_diag_handler_get_info,
|
|
.destroy = inet_diag_handler_cmd,
|
|
};
|
|
|
|
int inet_diag_register(const struct inet_diag_handler *h)
|
|
{
|
|
const __u16 type = h->idiag_type;
|
|
int err = -EINVAL;
|
|
|
|
if (type >= IPPROTO_MAX)
|
|
goto out;
|
|
|
|
mutex_lock(&inet_diag_table_mutex);
|
|
err = -EEXIST;
|
|
if (!inet_diag_table[type]) {
|
|
inet_diag_table[type] = h;
|
|
err = 0;
|
|
}
|
|
mutex_unlock(&inet_diag_table_mutex);
|
|
out:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(inet_diag_register);
|
|
|
|
void inet_diag_unregister(const struct inet_diag_handler *h)
|
|
{
|
|
const __u16 type = h->idiag_type;
|
|
|
|
if (type >= IPPROTO_MAX)
|
|
return;
|
|
|
|
mutex_lock(&inet_diag_table_mutex);
|
|
inet_diag_table[type] = NULL;
|
|
mutex_unlock(&inet_diag_table_mutex);
|
|
}
|
|
EXPORT_SYMBOL_GPL(inet_diag_unregister);
|
|
|
|
static int __init inet_diag_init(void)
|
|
{
|
|
const int inet_diag_table_size = (IPPROTO_MAX *
|
|
sizeof(struct inet_diag_handler *));
|
|
int err = -ENOMEM;
|
|
|
|
inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
|
|
if (!inet_diag_table)
|
|
goto out;
|
|
|
|
err = sock_diag_register(&inet_diag_handler);
|
|
if (err)
|
|
goto out_free_nl;
|
|
|
|
err = sock_diag_register(&inet6_diag_handler);
|
|
if (err)
|
|
goto out_free_inet;
|
|
|
|
sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
|
|
out:
|
|
return err;
|
|
|
|
out_free_inet:
|
|
sock_diag_unregister(&inet_diag_handler);
|
|
out_free_nl:
|
|
kfree(inet_diag_table);
|
|
goto out;
|
|
}
|
|
|
|
static void __exit inet_diag_exit(void)
|
|
{
|
|
sock_diag_unregister(&inet6_diag_handler);
|
|
sock_diag_unregister(&inet_diag_handler);
|
|
sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
|
|
kfree(inet_diag_table);
|
|
}
|
|
|
|
module_init(inet_diag_init);
|
|
module_exit(inet_diag_exit);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
|
|
MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
|