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0f1a24c9a9
Sending malformed llc packets triggers this spew, which seems excessive.
WARNING: CPU: 1 PID: 6917 at net/llc/llc_output.c:46 llc_mac_hdr_init+0x85/0x90 [llc]()
device type not supported: 0
CPU: 1 PID: 6917 Comm: trinity-c1 Not tainted 3.13.0+ #95
0000000000000009 00000000007e257d ffff88009232fbe8 ffffffffac737325
ffff88009232fc30 ffff88009232fc20 ffffffffac06d28d ffff88020e07f180
ffff88009232fec0 00000000000000c8 0000000000000000 ffff88009232fe70
Call Trace:
[<ffffffffac737325>] dump_stack+0x4e/0x7a
[<ffffffffac06d28d>] warn_slowpath_common+0x7d/0xa0
[<ffffffffac06d30c>] warn_slowpath_fmt+0x5c/0x80
[<ffffffffc01736d5>] llc_mac_hdr_init+0x85/0x90 [llc]
[<ffffffffc0173759>] llc_build_and_send_ui_pkt+0x79/0x90 [llc]
[<ffffffffc057cdba>] llc_ui_sendmsg+0x23a/0x400 [llc2]
[<ffffffffac605d8c>] sock_sendmsg+0x9c/0xe0
[<ffffffffac185a37>] ? might_fault+0x47/0x50
[<ffffffffac606321>] SYSC_sendto+0x121/0x1c0
[<ffffffffac011847>] ? syscall_trace_enter+0x207/0x270
[<ffffffffac6071ce>] SyS_sendto+0xe/0x10
[<ffffffffac74aaa4>] tracesys+0xdd/0xe2
Until 2009, this was a printk, when it was changed in
bf9ae5386b: "llc: use dev_hard_header".
Let userland figure out what -EINVAL means by itself.
Signed-off-by: Dave Jones <davej@fedoraproject.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
80 lines
2.3 KiB
C
80 lines
2.3 KiB
C
/*
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* llc_output.c - LLC minimal output path
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*
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* Copyright (c) 1997 by Procom Technology, Inc.
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* 2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
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*
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* This program can be redistributed or modified under the terms of the
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* GNU General Public License version 2 as published by the Free Software
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* Foundation.
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* This program is distributed without any warranty or implied warranty
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* of merchantability or fitness for a particular purpose.
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*
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* See the GNU General Public License version 2 for more details.
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*/
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#include <linux/if_arp.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/export.h>
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#include <net/llc.h>
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#include <net/llc_pdu.h>
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/**
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* llc_mac_hdr_init - fills MAC header fields
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* @skb: Address of the frame to initialize its MAC header
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* @sa: The MAC source address
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* @da: The MAC destination address
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*
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* Fills MAC header fields, depending on MAC type. Returns 0, If MAC type
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* is a valid type and initialization completes correctly 1, otherwise.
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*/
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int llc_mac_hdr_init(struct sk_buff *skb,
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const unsigned char *sa, const unsigned char *da)
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{
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int rc = -EINVAL;
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switch (skb->dev->type) {
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case ARPHRD_ETHER:
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case ARPHRD_LOOPBACK:
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rc = dev_hard_header(skb, skb->dev, ETH_P_802_2, da, sa,
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skb->len);
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if (rc > 0)
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rc = 0;
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break;
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default:
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break;
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}
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return rc;
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}
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/**
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* llc_build_and_send_ui_pkt - unitdata request interface for upper layers
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* @sap: sap to use
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* @skb: packet to send
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* @dmac: destination mac address
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* @dsap: destination sap
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*
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* Upper layers calls this function when upper layer wants to send data
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* using connection-less mode communication (UI pdu).
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*
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* Accept data frame from network layer to be sent using connection-
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* less mode communication; timeout/retries handled by network layer;
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* package primitive as an event and send to SAP event handler
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*/
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int llc_build_and_send_ui_pkt(struct llc_sap *sap, struct sk_buff *skb,
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unsigned char *dmac, unsigned char dsap)
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{
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int rc;
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llc_pdu_header_init(skb, LLC_PDU_TYPE_U, sap->laddr.lsap,
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dsap, LLC_PDU_CMD);
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llc_pdu_init_as_ui_cmd(skb);
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rc = llc_mac_hdr_init(skb, skb->dev->dev_addr, dmac);
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if (likely(!rc))
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rc = dev_queue_xmit(skb);
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return rc;
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}
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EXPORT_SYMBOL(llc_mac_hdr_init);
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EXPORT_SYMBOL(llc_build_and_send_ui_pkt);
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