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a6d75ecee2
It is unclear if net/lapb code is supposed to be ready for 8021q.
We can at least avoid crashes like the following :
skbuff: skb_under_panic: text:ffffffff8aabe1f6 len:24 put:20 head:ffff88802824a400 data:ffff88802824a3fe tail:0x16 end:0x140 dev:nr0.2
------------[ cut here ]------------
kernel BUG at net/core/skbuff.c:206 !
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI
CPU: 1 UID: 0 PID: 5508 Comm: dhcpcd Not tainted 6.12.0-rc7-syzkaller-00144-g66418447d27b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
RIP: 0010:skb_panic net/core/skbuff.c:206 [inline]
RIP: 0010:skb_under_panic+0x14b/0x150 net/core/skbuff.c:216
Code: 0d 8d 48 c7 c6 2e 9e 29 8e 48 8b 54 24 08 8b 0c 24 44 8b 44 24 04 4d 89 e9 50 41 54 41 57 41 56 e8 1a 6f 37 02 48 83 c4 20 90 <0f> 0b 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3
RSP: 0018:ffffc90002ddf638 EFLAGS: 00010282
RAX: 0000000000000086 RBX: dffffc0000000000 RCX: 7a24750e538ff600
RDX: 0000000000000000 RSI: 0000000000000201 RDI: 0000000000000000
RBP: ffff888034a86650 R08: ffffffff8174b13c R09: 1ffff920005bbe60
R10: dffffc0000000000 R11: fffff520005bbe61 R12: 0000000000000140
R13: ffff88802824a400 R14: ffff88802824a3fe R15: 0000000000000016
FS: 00007f2a5990d740(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2631fd CR3: 0000000029504000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
skb_push+0xe5/0x100 net/core/skbuff.c:2636
nr_header+0x36/0x320 net/netrom/nr_dev.c:69
dev_hard_header include/linux/netdevice.h:3148 [inline]
vlan_dev_hard_header+0x359/0x480 net/8021q/vlan_dev.c:83
dev_hard_header include/linux/netdevice.h:3148 [inline]
lapbeth_data_transmit+0x1f6/0x2a0 drivers/net/wan/lapbether.c:257
lapb_data_transmit+0x91/0xb0 net/lapb/lapb_iface.c:447
lapb_transmit_buffer+0x168/0x1f0 net/lapb/lapb_out.c:149
lapb_establish_data_link+0x84/0xd0
lapb_device_event+0x4e0/0x670
notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93
__dev_notify_flags+0x207/0x400
dev_change_flags+0xf0/0x1a0 net/core/dev.c:8922
devinet_ioctl+0xa4e/0x1aa0 net/ipv4/devinet.c:1188
inet_ioctl+0x3d7/0x4f0 net/ipv4/af_inet.c:1003
sock_do_ioctl+0x158/0x460 net/socket.c:1227
sock_ioctl+0x626/0x8e0 net/socket.c:1346
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:907 [inline]
__se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
Fixes: 1da177e4c3
("Linux-2.6.12-rc2")
Reported-by: syzbot+fb99d1b0c0f81d94a5e2@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/netdev/67506220.050a0220.17bd51.006c.GAE@google.com/T/#u
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20241204141031.4030267-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
163 lines
4.8 KiB
C
163 lines
4.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LAPB_H
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#define _LAPB_H
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#include <linux/lapb.h>
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#include <linux/refcount.h>
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#define LAPB_HEADER_LEN MAX_HEADER /* LAPB over Ethernet + a bit more */
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#define LAPB_ACK_PENDING_CONDITION 0x01
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#define LAPB_REJECT_CONDITION 0x02
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#define LAPB_PEER_RX_BUSY_CONDITION 0x04
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/* Control field templates */
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#define LAPB_I 0x00 /* Information frames */
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#define LAPB_S 0x01 /* Supervisory frames */
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#define LAPB_U 0x03 /* Unnumbered frames */
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#define LAPB_RR 0x01 /* Receiver ready */
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#define LAPB_RNR 0x05 /* Receiver not ready */
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#define LAPB_REJ 0x09 /* Reject */
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#define LAPB_SABM 0x2F /* Set Asynchronous Balanced Mode */
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#define LAPB_SABME 0x6F /* Set Asynchronous Balanced Mode Extended */
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#define LAPB_DISC 0x43 /* Disconnect */
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#define LAPB_DM 0x0F /* Disconnected mode */
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#define LAPB_UA 0x63 /* Unnumbered acknowledge */
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#define LAPB_FRMR 0x87 /* Frame reject */
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#define LAPB_ILLEGAL 0x100 /* Impossible to be a real frame type */
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#define LAPB_SPF 0x10 /* Poll/final bit for standard LAPB */
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#define LAPB_EPF 0x01 /* Poll/final bit for extended LAPB */
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#define LAPB_FRMR_W 0x01 /* Control field invalid */
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#define LAPB_FRMR_X 0x02 /* I field invalid */
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#define LAPB_FRMR_Y 0x04 /* I field too long */
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#define LAPB_FRMR_Z 0x08 /* Invalid N(R) */
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#define LAPB_POLLOFF 0
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#define LAPB_POLLON 1
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/* LAPB C-bit */
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#define LAPB_COMMAND 1
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#define LAPB_RESPONSE 2
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#define LAPB_ADDR_A 0x03
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#define LAPB_ADDR_B 0x01
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#define LAPB_ADDR_C 0x0F
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#define LAPB_ADDR_D 0x07
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/* Define Link State constants. */
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enum {
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LAPB_STATE_0, /* Disconnected State */
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LAPB_STATE_1, /* Awaiting Connection State */
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LAPB_STATE_2, /* Awaiting Disconnection State */
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LAPB_STATE_3, /* Data Transfer State */
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LAPB_STATE_4 /* Frame Reject State */
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};
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#define LAPB_DEFAULT_MODE (LAPB_STANDARD | LAPB_SLP | LAPB_DTE)
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#define LAPB_DEFAULT_WINDOW 7 /* Window=7 */
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#define LAPB_DEFAULT_T1 (5 * HZ) /* T1=5s */
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#define LAPB_DEFAULT_T2 (1 * HZ) /* T2=1s */
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#define LAPB_DEFAULT_N2 20 /* N2=20 */
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#define LAPB_SMODULUS 8
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#define LAPB_EMODULUS 128
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/*
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* Information about the current frame.
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*/
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struct lapb_frame {
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unsigned short type; /* Parsed type */
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unsigned short nr, ns; /* N(R), N(S) */
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unsigned char cr; /* Command/Response */
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unsigned char pf; /* Poll/Final */
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unsigned char control[2]; /* Original control data*/
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};
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/*
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* The per LAPB connection control structure.
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*/
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struct lapb_cb {
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struct list_head node;
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struct net_device *dev;
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/* Link status fields */
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unsigned int mode;
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unsigned char state;
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unsigned short vs, vr, va;
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unsigned char condition;
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unsigned short n2, n2count;
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unsigned short t1, t2;
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struct timer_list t1timer, t2timer;
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bool t1timer_running, t2timer_running;
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/* Internal control information */
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struct sk_buff_head write_queue;
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struct sk_buff_head ack_queue;
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unsigned char window;
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const struct lapb_register_struct *callbacks;
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/* FRMR control information */
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struct lapb_frame frmr_data;
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unsigned char frmr_type;
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spinlock_t lock;
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refcount_t refcnt;
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};
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/* lapb_iface.c */
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void lapb_connect_confirmation(struct lapb_cb *lapb, int);
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void lapb_connect_indication(struct lapb_cb *lapb, int);
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void lapb_disconnect_confirmation(struct lapb_cb *lapb, int);
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void lapb_disconnect_indication(struct lapb_cb *lapb, int);
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int lapb_data_indication(struct lapb_cb *lapb, struct sk_buff *);
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int lapb_data_transmit(struct lapb_cb *lapb, struct sk_buff *);
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/* lapb_in.c */
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void lapb_data_input(struct lapb_cb *lapb, struct sk_buff *);
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/* lapb_out.c */
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void lapb_kick(struct lapb_cb *lapb);
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void lapb_transmit_buffer(struct lapb_cb *lapb, struct sk_buff *, int);
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void lapb_establish_data_link(struct lapb_cb *lapb);
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void lapb_enquiry_response(struct lapb_cb *lapb);
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void lapb_timeout_response(struct lapb_cb *lapb);
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void lapb_check_iframes_acked(struct lapb_cb *lapb, unsigned short);
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void lapb_check_need_response(struct lapb_cb *lapb, int, int);
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/* lapb_subr.c */
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void lapb_clear_queues(struct lapb_cb *lapb);
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void lapb_frames_acked(struct lapb_cb *lapb, unsigned short);
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void lapb_requeue_frames(struct lapb_cb *lapb);
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int lapb_validate_nr(struct lapb_cb *lapb, unsigned short);
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int lapb_decode(struct lapb_cb *lapb, struct sk_buff *, struct lapb_frame *);
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void lapb_send_control(struct lapb_cb *lapb, int, int, int);
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void lapb_transmit_frmr(struct lapb_cb *lapb);
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/* lapb_timer.c */
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void lapb_start_t1timer(struct lapb_cb *lapb);
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void lapb_start_t2timer(struct lapb_cb *lapb);
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void lapb_stop_t1timer(struct lapb_cb *lapb);
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void lapb_stop_t2timer(struct lapb_cb *lapb);
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int lapb_t1timer_running(struct lapb_cb *lapb);
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/*
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* Debug levels.
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* 0 = Off
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* 1 = State Changes
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* 2 = Packets I/O and State Changes
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* 3 = Hex dumps, Packets I/O and State Changes.
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*/
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#define LAPB_DEBUG 0
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#define lapb_dbg(level, fmt, ...) \
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do { \
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if (level < LAPB_DEBUG) \
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pr_debug(fmt, ##__VA_ARGS__); \
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} while (0)
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#endif
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