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linux/include/net/llc_pdu.h
Kuniyuki Iwashima e3f9bed9be llc: Drop support for ETH_P_TR_802_2. 
syzbot reported an uninit-value bug below. [0]

llc supports ETH_P_802_2 (0x0004) and used to support ETH_P_TR_802_2
(0x0011), and syzbot abused the latter to trigger the bug.

  write$tun(r0, &(0x7f0000000040)={@val={0x0, 0x11}, @val, @mpls={[], @llc={@snap={0xaa, 0x1, ')', "90e5dd"}}}}, 0x16)

llc_conn_handler() initialises local variables {saddr,daddr}.mac
based on skb in llc_pdu_decode_sa()/llc_pdu_decode_da() and passes
them to __llc_lookup().

However, the initialisation is done only when skb->protocol is
htons(ETH_P_802_2), otherwise, __llc_lookup_established() and
__llc_lookup_listener() will read garbage.

The missing initialisation existed prior to commit 211ed86510
("net: delete all instances of special processing for token ring").

It removed the part to kick out the token ring stuff but forgot to
close the door allowing ETH_P_TR_802_2 packets to sneak into llc_rcv().

Let's remove llc_tr_packet_type and complete the deprecation.

[0]:
BUG: KMSAN: uninit-value in __llc_lookup_established+0xe9d/0xf90
 __llc_lookup_established+0xe9d/0xf90
 __llc_lookup net/llc/llc_conn.c:611 [inline]
 llc_conn_handler+0x4bd/0x1360 net/llc/llc_conn.c:791
 llc_rcv+0xfbb/0x14a0 net/llc/llc_input.c:206
 __netif_receive_skb_one_core net/core/dev.c:5527 [inline]
 __netif_receive_skb+0x1a6/0x5a0 net/core/dev.c:5641
 netif_receive_skb_internal net/core/dev.c:5727 [inline]
 netif_receive_skb+0x58/0x660 net/core/dev.c:5786
 tun_rx_batched+0x3ee/0x980 drivers/net/tun.c:1555
 tun_get_user+0x53af/0x66d0 drivers/net/tun.c:2002
 tun_chr_write_iter+0x3af/0x5d0 drivers/net/tun.c:2048
 call_write_iter include/linux/fs.h:2020 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x8ef/0x1490 fs/read_write.c:584
 ksys_write+0x20f/0x4c0 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __x64_sys_write+0x93/0xd0 fs/read_write.c:646
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

Local variable daddr created at:
 llc_conn_handler+0x53/0x1360 net/llc/llc_conn.c:783
 llc_rcv+0xfbb/0x14a0 net/llc/llc_input.c:206

CPU: 1 PID: 5004 Comm: syz-executor994 Not tainted 6.6.0-syzkaller-14500-g1c41041124bd #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023

Fixes: 211ed86510 ("net: delete all instances of special processing for token ring")
Reported-by: syzbot+b5ad66046b913bc04c6f@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=b5ad66046b913bc04c6f
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20240119015515.61898-1-kuniyu@amazon.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-01-19 21:30:09 -08:00

445 lines
14 KiB
C
Raw Blame History

#ifndef LLC_PDU_H
#define LLC_PDU_H
/*
* Copyright (c) 1997 by Procom Technology,Inc.
* 2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
*
* This program can be redistributed or modified under the terms of the
* GNU General Public License as published by the Free Software Foundation.
* This program is distributed without any warranty or implied warranty
* of merchantability or fitness for a particular purpose.
*
* See the GNU General Public License for more details.
*/
#include <linux/if_ether.h>
/* Lengths of frame formats */
#define LLC_PDU_LEN_I 4 /* header and 2 control bytes */
#define LLC_PDU_LEN_S 4
#define LLC_PDU_LEN_U 3 /* header and 1 control byte */
/* header and 1 control byte and XID info */
#define LLC_PDU_LEN_U_XID (LLC_PDU_LEN_U + sizeof(struct llc_xid_info))
/* Known SAP addresses */
#define LLC_GLOBAL_SAP 0xFF
#define LLC_NULL_SAP 0x00 /* not network-layer visible */
#define LLC_MGMT_INDIV 0x02 /* station LLC mgmt indiv addr */
#define LLC_MGMT_GRP 0x03 /* station LLC mgmt group addr */
#define LLC_RDE_SAP 0xA6 /* route ... */
/* SAP field bit masks */
#define LLC_ISO_RESERVED_SAP 0x02
#define LLC_SAP_GROUP_DSAP 0x01
#define LLC_SAP_RESP_SSAP 0x01
/* Group/individual DSAP indicator is DSAP field */
#define LLC_PDU_GROUP_DSAP_MASK 0x01
#define LLC_PDU_IS_GROUP_DSAP(pdu) \
((pdu->dsap & LLC_PDU_GROUP_DSAP_MASK) ? 0 : 1)
#define LLC_PDU_IS_INDIV_DSAP(pdu) \
(!(pdu->dsap & LLC_PDU_GROUP_DSAP_MASK) ? 0 : 1)
/* Command/response PDU indicator in SSAP field */
#define LLC_PDU_CMD_RSP_MASK 0x01
#define LLC_PDU_CMD 0
#define LLC_PDU_RSP 1
#define LLC_PDU_IS_CMD(pdu) ((pdu->ssap & LLC_PDU_RSP) ? 0 : 1)
#define LLC_PDU_IS_RSP(pdu) ((pdu->ssap & LLC_PDU_RSP) ? 1 : 0)
/* Get PDU type from 2 lowest-order bits of control field first byte */
#define LLC_PDU_TYPE_I_MASK 0x01 /* 16-bit control field */
#define LLC_PDU_TYPE_S_MASK 0x03
#define LLC_PDU_TYPE_U_MASK 0x03 /* 8-bit control field */
#define LLC_PDU_TYPE_MASK 0x03
#define LLC_PDU_TYPE_I 0 /* first bit */
#define LLC_PDU_TYPE_S 1 /* first two bits */
#define LLC_PDU_TYPE_U 3 /* first two bits */
#define LLC_PDU_TYPE_U_XID 4 /* private type for detecting XID commands */
#define LLC_PDU_TYPE_IS_I(pdu) \
((!(pdu->ctrl_1 & LLC_PDU_TYPE_I_MASK)) ? 1 : 0)
#define LLC_PDU_TYPE_IS_U(pdu) \
(((pdu->ctrl_1 & LLC_PDU_TYPE_U_MASK) == LLC_PDU_TYPE_U) ? 1 : 0)
#define LLC_PDU_TYPE_IS_S(pdu) \
(((pdu->ctrl_1 & LLC_PDU_TYPE_S_MASK) == LLC_PDU_TYPE_S) ? 1 : 0)
/* U-format PDU control field masks */
#define LLC_U_PF_BIT_MASK 0x10 /* P/F bit mask */
#define LLC_U_PF_IS_1(pdu) ((pdu->ctrl_1 & LLC_U_PF_BIT_MASK) ? 1 : 0)
#define LLC_U_PF_IS_0(pdu) ((!(pdu->ctrl_1 & LLC_U_PF_BIT_MASK)) ? 1 : 0)
#define LLC_U_PDU_CMD_MASK 0xEC /* cmd/rsp mask */
#define LLC_U_PDU_CMD(pdu) (pdu->ctrl_1 & LLC_U_PDU_CMD_MASK)
#define LLC_U_PDU_RSP(pdu) (pdu->ctrl_1 & LLC_U_PDU_CMD_MASK)
#define LLC_1_PDU_CMD_UI 0x00 /* Type 1 cmds/rsps */
#define LLC_1_PDU_CMD_XID 0xAC
#define LLC_1_PDU_CMD_TEST 0xE0
#define LLC_2_PDU_CMD_SABME 0x6C /* Type 2 cmds/rsps */
#define LLC_2_PDU_CMD_DISC 0x40
#define LLC_2_PDU_RSP_UA 0x60
#define LLC_2_PDU_RSP_DM 0x0C
#define LLC_2_PDU_RSP_FRMR 0x84
/* Type 1 operations */
/* XID information field bit masks */
/* LLC format identifier (byte 1) */
#define LLC_XID_FMT_ID 0x81 /* first byte must be this */
/* LLC types/classes identifier (byte 2) */
#define LLC_XID_CLASS_ZEROS_MASK 0xE0 /* these must be zeros */
#define LLC_XID_CLASS_MASK 0x1F /* AND with byte to get below */
#define LLC_XID_NULL_CLASS_1 0x01 /* if NULL LSAP...use these */
#define LLC_XID_NULL_CLASS_2 0x03
#define LLC_XID_NULL_CLASS_3 0x05
#define LLC_XID_NULL_CLASS_4 0x07
#define LLC_XID_NNULL_TYPE_1 0x01 /* if non-NULL LSAP...use these */
#define LLC_XID_NNULL_TYPE_2 0x02
#define LLC_XID_NNULL_TYPE_3 0x04
#define LLC_XID_NNULL_TYPE_1_2 0x03
#define LLC_XID_NNULL_TYPE_1_3 0x05
#define LLC_XID_NNULL_TYPE_2_3 0x06
#define LLC_XID_NNULL_ALL 0x07
/* Sender Receive Window (byte 3) */
#define LLC_XID_RW_MASK 0xFE /* AND with value to get below */
#define LLC_XID_MIN_RW 0x02 /* lowest-order bit always zero */
/* Type 2 operations */
#define LLC_2_SEQ_NBR_MODULO ((u8) 128)
/* I-PDU masks ('ctrl' is I-PDU control word) */
#define LLC_I_GET_NS(pdu) (u8)((pdu->ctrl_1 & 0xFE) >> 1)
#define LLC_I_GET_NR(pdu) (u8)((pdu->ctrl_2 & 0xFE) >> 1)
#define LLC_I_PF_BIT_MASK 0x01
#define LLC_I_PF_IS_0(pdu) ((!(pdu->ctrl_2 & LLC_I_PF_BIT_MASK)) ? 1 : 0)
#define LLC_I_PF_IS_1(pdu) ((pdu->ctrl_2 & LLC_I_PF_BIT_MASK) ? 1 : 0)
/* S-PDU supervisory commands and responses */
#define LLC_S_PDU_CMD_MASK 0x0C
#define LLC_S_PDU_CMD(pdu) (pdu->ctrl_1 & LLC_S_PDU_CMD_MASK)
#define LLC_S_PDU_RSP(pdu) (pdu->ctrl_1 & LLC_S_PDU_CMD_MASK)
#define LLC_2_PDU_CMD_RR 0x00 /* rx ready cmd */
#define LLC_2_PDU_RSP_RR 0x00 /* rx ready rsp */
#define LLC_2_PDU_CMD_REJ 0x08 /* reject PDU cmd */
#define LLC_2_PDU_RSP_REJ 0x08 /* reject PDU rsp */
#define LLC_2_PDU_CMD_RNR 0x04 /* rx not ready cmd */
#define LLC_2_PDU_RSP_RNR 0x04 /* rx not ready rsp */
#define LLC_S_PF_BIT_MASK 0x01
#define LLC_S_PF_IS_0(pdu) ((!(pdu->ctrl_2 & LLC_S_PF_BIT_MASK)) ? 1 : 0)
#define LLC_S_PF_IS_1(pdu) ((pdu->ctrl_2 & LLC_S_PF_BIT_MASK) ? 1 : 0)
#define PDU_SUPV_GET_Nr(pdu) ((pdu->ctrl_2 & 0xFE) >> 1)
#define PDU_GET_NEXT_Vr(sn) (((sn) + 1) & ~LLC_2_SEQ_NBR_MODULO)
/* FRMR information field macros */
#define FRMR_INFO_LENGTH 5 /* 5 bytes of information */
/*
* info is pointer to FRMR info field structure; 'rej_ctrl' is byte pointer
* (if U-PDU) or word pointer to rejected PDU control field
*/
#define FRMR_INFO_SET_REJ_CNTRL(info,rej_ctrl) \
info->rej_pdu_ctrl = ((*((u8 *) rej_ctrl) & \
LLC_PDU_TYPE_U) != LLC_PDU_TYPE_U ? \
(u16)*((u16 *) rej_ctrl) : \
(((u16) *((u8 *) rej_ctrl)) & 0x00FF))
/*
* Info is pointer to FRMR info field structure; 'vs' is a byte containing
* send state variable value in low-order 7 bits (insure the lowest-order
* bit remains zero (0))
*/
#define FRMR_INFO_SET_Vs(info,vs) (info->curr_ssv = (((u8) vs) << 1))
#define FRMR_INFO_SET_Vr(info,vr) (info->curr_rsv = (((u8) vr) << 1))
/*
* Info is pointer to FRMR info field structure; 'cr' is a byte containing
* the C/R bit value in the low-order bit
*/
#define FRMR_INFO_SET_C_R_BIT(info, cr) (info->curr_rsv |= (((u8) cr) & 0x01))
/*
* In the remaining five macros, 'info' is pointer to FRMR info field
* structure; 'ind' is a byte containing the bit value to set in the
* lowest-order bit)
*/
#define FRMR_INFO_SET_INVALID_PDU_CTRL_IND(info, ind) \
(info->ind_bits = ((info->ind_bits & 0xFE) | (((u8) ind) & 0x01)))
#define FRMR_INFO_SET_INVALID_PDU_INFO_IND(info, ind) \
(info->ind_bits = ( (info->ind_bits & 0xFD) | (((u8) ind) & 0x02)))
#define FRMR_INFO_SET_PDU_INFO_2LONG_IND(info, ind) \
(info->ind_bits = ( (info->ind_bits & 0xFB) | (((u8) ind) & 0x04)))
#define FRMR_INFO_SET_PDU_INVALID_Nr_IND(info, ind) \
(info->ind_bits = ( (info->ind_bits & 0xF7) | (((u8) ind) & 0x08)))
#define FRMR_INFO_SET_PDU_INVALID_Ns_IND(info, ind) \
(info->ind_bits = ( (info->ind_bits & 0xEF) | (((u8) ind) & 0x10)))
/* Sequence-numbered PDU format (4 bytes in length) */
struct llc_pdu_sn {
u8 dsap;
u8 ssap;
u8 ctrl_1;
u8 ctrl_2;
} __packed;
static inline struct llc_pdu_sn *llc_pdu_sn_hdr(struct sk_buff *skb)
{
return (struct llc_pdu_sn *)skb_network_header(skb);
}
/* Un-numbered PDU format (3 bytes in length) */
struct llc_pdu_un {
u8 dsap;
u8 ssap;
u8 ctrl_1;
} __packed;
static inline struct llc_pdu_un *llc_pdu_un_hdr(struct sk_buff *skb)
{
return (struct llc_pdu_un *)skb_network_header(skb);
}
/**
* llc_pdu_header_init - initializes pdu header
* @skb: input skb that header must be set into it.
* @type: type of PDU (U, I or S).
* @ssap: source sap.
* @dsap: destination sap.
* @cr: command/response bit (0 or 1).
*
* This function sets DSAP, SSAP and command/Response bit in LLC header.
*/
static inline void llc_pdu_header_init(struct sk_buff *skb, u8 type,
u8 ssap, u8 dsap, u8 cr)
{
int hlen = 4; /* default value for I and S types */
struct llc_pdu_un *pdu;
switch (type) {
case LLC_PDU_TYPE_U:
hlen = 3;
break;
case LLC_PDU_TYPE_U_XID:
hlen = 6;
break;
}
skb_push(skb, hlen);
skb_reset_network_header(skb);
pdu = llc_pdu_un_hdr(skb);
pdu->dsap = dsap;
pdu->ssap = ssap;
pdu->ssap |= cr;
}
/**
* llc_pdu_decode_sa - extracs source address (MAC) of input frame
* @skb: input skb that source address must be extracted from it.
* @sa: pointer to source address (6 byte array).
*
* This function extracts source address(MAC) of input frame.
*/
static inline void llc_pdu_decode_sa(struct sk_buff *skb, u8 *sa)
{
memcpy(sa, eth_hdr(skb)->h_source, ETH_ALEN);
}
/**
* llc_pdu_decode_da - extracts dest address of input frame
* @skb: input skb that destination address must be extracted from it
* @da: pointer to destination address (6 byte array).
*
* This function extracts destination address(MAC) of input frame.
*/
static inline void llc_pdu_decode_da(struct sk_buff *skb, u8 *da)
{
memcpy(da, eth_hdr(skb)->h_dest, ETH_ALEN);
}
/**
* llc_pdu_decode_ssap - extracts source SAP of input frame
* @skb: input skb that source SAP must be extracted from it.
* @ssap: source SAP (output argument).
*
* This function extracts source SAP of input frame. Right bit of SSAP is
* command/response bit.
*/
static inline void llc_pdu_decode_ssap(struct sk_buff *skb, u8 *ssap)
{
*ssap = llc_pdu_un_hdr(skb)->ssap & 0xFE;
}
/**
* llc_pdu_decode_dsap - extracts dest SAP of input frame
* @skb: input skb that destination SAP must be extracted from it.
* @dsap: destination SAP (output argument).
*
* This function extracts destination SAP of input frame. right bit of
* DSAP designates individual/group SAP.
*/
static inline void llc_pdu_decode_dsap(struct sk_buff *skb, u8 *dsap)
{
*dsap = llc_pdu_un_hdr(skb)->dsap & 0xFE;
}
/**
* llc_pdu_init_as_ui_cmd - sets LLC header as UI PDU
* @skb: input skb that header must be set into it.
*
* This function sets third byte of LLC header as a UI PDU.
*/
static inline void llc_pdu_init_as_ui_cmd(struct sk_buff *skb)
{
struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
pdu->ctrl_1 = LLC_PDU_TYPE_U;
pdu->ctrl_1 |= LLC_1_PDU_CMD_UI;
}
/**
* llc_pdu_init_as_test_cmd - sets PDU as TEST
* @skb: Address of the skb to build
*
* Sets a PDU as TEST
*/
static inline void llc_pdu_init_as_test_cmd(struct sk_buff *skb)
{
struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
pdu->ctrl_1 = LLC_PDU_TYPE_U;
pdu->ctrl_1 |= LLC_1_PDU_CMD_TEST;
pdu->ctrl_1 |= LLC_U_PF_BIT_MASK;
}
/**
* llc_pdu_init_as_test_rsp - build TEST response PDU
* @skb: Address of the skb to build
* @ev_skb: The received TEST command PDU frame
*
* Builds a pdu frame as a TEST response.
*/
static inline void llc_pdu_init_as_test_rsp(struct sk_buff *skb,
struct sk_buff *ev_skb)
{
struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
pdu->ctrl_1 = LLC_PDU_TYPE_U;
pdu->ctrl_1 |= LLC_1_PDU_CMD_TEST;
pdu->ctrl_1 |= LLC_U_PF_BIT_MASK;
if (ev_skb->protocol == htons(ETH_P_802_2)) {
struct llc_pdu_un *ev_pdu = llc_pdu_un_hdr(ev_skb);
int dsize;
dsize = ntohs(eth_hdr(ev_skb)->h_proto) - 3;
memcpy(((u8 *)pdu) + 3, ((u8 *)ev_pdu) + 3, dsize);
skb_put(skb, dsize);
}
}
/* LLC Type 1 XID command/response information fields format */
struct llc_xid_info {
u8 fmt_id; /* always 0x81 for LLC */
u8 type; /* different if NULL/non-NULL LSAP */
u8 rw; /* sender receive window */
} __packed;
/**
* llc_pdu_init_as_xid_cmd - sets bytes 3, 4 & 5 of LLC header as XID
* @skb: input skb that header must be set into it.
* @svcs_supported: The class of the LLC (I or II)
* @rx_window: The size of the receive window of the LLC
*
* This function sets third,fourth,fifth and sixth bytes of LLC header as
* a XID PDU.
*/
static inline void llc_pdu_init_as_xid_cmd(struct sk_buff *skb,
u8 svcs_supported, u8 rx_window)
{
struct llc_xid_info *xid_info;
struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
pdu->ctrl_1 = LLC_PDU_TYPE_U;
pdu->ctrl_1 |= LLC_1_PDU_CMD_XID;
pdu->ctrl_1 |= LLC_U_PF_BIT_MASK;
xid_info = (struct llc_xid_info *)(((u8 *)&pdu->ctrl_1) + 1);
xid_info->fmt_id = LLC_XID_FMT_ID; /* 0x81 */
xid_info->type = svcs_supported;
xid_info->rw = rx_window << 1; /* size of receive window */
/* no need to push/put since llc_pdu_header_init() has already
* pushed 3 + 3 bytes
*/
}
/**
* llc_pdu_init_as_xid_rsp - builds XID response PDU
* @skb: Address of the skb to build
* @svcs_supported: The class of the LLC (I or II)
* @rx_window: The size of the receive window of the LLC
*
* Builds a pdu frame as an XID response.
*/
static inline void llc_pdu_init_as_xid_rsp(struct sk_buff *skb,
u8 svcs_supported, u8 rx_window)
{
struct llc_xid_info *xid_info;
struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
pdu->ctrl_1 = LLC_PDU_TYPE_U;
pdu->ctrl_1 |= LLC_1_PDU_CMD_XID;
pdu->ctrl_1 |= LLC_U_PF_BIT_MASK;
xid_info = (struct llc_xid_info *)(((u8 *)&pdu->ctrl_1) + 1);
xid_info->fmt_id = LLC_XID_FMT_ID;
xid_info->type = svcs_supported;
xid_info->rw = rx_window << 1;
skb_put(skb, sizeof(struct llc_xid_info));
}
/* LLC Type 2 FRMR response information field format */
struct llc_frmr_info {
u16 rej_pdu_ctrl; /* bits 1-8 if U-PDU */
u8 curr_ssv; /* current send state variable val */
u8 curr_rsv; /* current receive state variable */
u8 ind_bits; /* indicator bits set with macro */
} __packed;
void llc_pdu_set_cmd_rsp(struct sk_buff *skb, u8 type);
void llc_pdu_set_pf_bit(struct sk_buff *skb, u8 bit_value);
void llc_pdu_decode_pf_bit(struct sk_buff *skb, u8 *pf_bit);
void llc_pdu_init_as_disc_cmd(struct sk_buff *skb, u8 p_bit);
void llc_pdu_init_as_i_cmd(struct sk_buff *skb, u8 p_bit, u8 ns, u8 nr);
void llc_pdu_init_as_rej_cmd(struct sk_buff *skb, u8 p_bit, u8 nr);
void llc_pdu_init_as_rnr_cmd(struct sk_buff *skb, u8 p_bit, u8 nr);
void llc_pdu_init_as_rr_cmd(struct sk_buff *skb, u8 p_bit, u8 nr);
void llc_pdu_init_as_sabme_cmd(struct sk_buff *skb, u8 p_bit);
void llc_pdu_init_as_dm_rsp(struct sk_buff *skb, u8 f_bit);
void llc_pdu_init_as_frmr_rsp(struct sk_buff *skb, struct llc_pdu_sn *prev_pdu,
u8 f_bit, u8 vs, u8 vr, u8 vzyxw);
void llc_pdu_init_as_rr_rsp(struct sk_buff *skb, u8 f_bit, u8 nr);
void llc_pdu_init_as_rej_rsp(struct sk_buff *skb, u8 f_bit, u8 nr);
void llc_pdu_init_as_rnr_rsp(struct sk_buff *skb, u8 f_bit, u8 nr);
void llc_pdu_init_as_ua_rsp(struct sk_buff *skb, u8 f_bit);
#endif /* LLC_PDU_H */
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