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b905ef9ab9
The connection timers of an llc sock could be still flying after we delete them in llc_sk_free(), and even possibly after we free the sock. We could just wait synchronously here in case of troubles. Note, I leave other call paths as they are, since they may not have to wait, at least we can change them to synchronously when needed. Also, move the code to net/llc/llc_conn.c, which is apparently a better place. Reported-by: <syzbot+f922284c18ea23a8e457@syzkaller.appspotmail.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
120 lines
4.1 KiB
C
120 lines
4.1 KiB
C
#ifndef LLC_CONN_H
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#define LLC_CONN_H
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/*
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* Copyright (c) 1997 by Procom Technology, Inc.
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* 2001, 2002 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 as published by the Free Software 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 for more details.
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*/
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#include <linux/timer.h>
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#include <net/llc_if.h>
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#include <net/sock.h>
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#include <linux/llc.h>
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#define LLC_EVENT 1
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#define LLC_PACKET 2
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#define LLC2_P_TIME 2
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#define LLC2_ACK_TIME 1
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#define LLC2_REJ_TIME 3
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#define LLC2_BUSY_TIME 3
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struct llc_timer {
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struct timer_list timer;
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unsigned long expire; /* timer expire time */
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};
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struct llc_sock {
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/* struct sock must be the first member of llc_sock */
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struct sock sk;
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struct sockaddr_llc addr; /* address sock is bound to */
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u8 state; /* state of connection */
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struct llc_sap *sap; /* pointer to parent SAP */
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struct llc_addr laddr; /* lsap/mac pair */
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struct llc_addr daddr; /* dsap/mac pair */
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struct net_device *dev; /* device to send to remote */
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u32 copied_seq; /* head of yet unread data */
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u8 retry_count; /* number of retries */
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u8 ack_must_be_send;
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u8 first_pdu_Ns;
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u8 npta;
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struct llc_timer ack_timer;
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struct llc_timer pf_cycle_timer;
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struct llc_timer rej_sent_timer;
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struct llc_timer busy_state_timer; /* ind busy clr at remote LLC */
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u8 vS; /* seq# next in-seq I-PDU tx'd*/
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u8 vR; /* seq# next in-seq I-PDU rx'd*/
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u32 n2; /* max nbr re-tx's for timeout*/
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u32 n1; /* max nbr octets in I PDU */
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u8 k; /* tx window size; max = 127 */
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u8 rw; /* rx window size; max = 127 */
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u8 p_flag; /* state flags */
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u8 f_flag;
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u8 s_flag;
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u8 data_flag;
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u8 remote_busy_flag;
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u8 cause_flag;
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struct sk_buff_head pdu_unack_q; /* PUDs sent/waiting ack */
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u16 link; /* network layer link number */
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u8 X; /* a temporary variable */
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u8 ack_pf; /* this flag indicates what is
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the P-bit of acknowledge */
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u8 failed_data_req; /* recognize that already exist a
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failed llc_data_req_handler
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(tx_buffer_full or unacceptable
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state */
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u8 dec_step;
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u8 inc_cntr;
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u8 dec_cntr;
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u8 connect_step;
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u8 last_nr; /* NR of last pdu received */
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u32 rx_pdu_hdr; /* used for saving header of last pdu
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received and caused sending FRMR.
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Used for resending FRMR */
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u32 cmsg_flags;
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struct hlist_node dev_hash_node;
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};
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static inline struct llc_sock *llc_sk(const struct sock *sk)
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{
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return (struct llc_sock *)sk;
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}
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static __inline__ void llc_set_backlog_type(struct sk_buff *skb, char type)
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{
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skb->cb[sizeof(skb->cb) - 1] = type;
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}
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static __inline__ char llc_backlog_type(struct sk_buff *skb)
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{
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return skb->cb[sizeof(skb->cb) - 1];
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}
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struct sock *llc_sk_alloc(struct net *net, int family, gfp_t priority,
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struct proto *prot, int kern);
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void llc_sk_stop_all_timers(struct sock *sk, bool sync);
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void llc_sk_free(struct sock *sk);
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void llc_sk_reset(struct sock *sk);
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/* Access to a connection */
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int llc_conn_state_process(struct sock *sk, struct sk_buff *skb);
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int llc_conn_send_pdu(struct sock *sk, struct sk_buff *skb);
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void llc_conn_rtn_pdu(struct sock *sk, struct sk_buff *skb);
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void llc_conn_resend_i_pdu_as_cmd(struct sock *sk, u8 nr, u8 first_p_bit);
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void llc_conn_resend_i_pdu_as_rsp(struct sock *sk, u8 nr, u8 first_f_bit);
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int llc_conn_remove_acked_pdus(struct sock *conn, u8 nr, u16 *how_many_unacked);
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struct sock *llc_lookup_established(struct llc_sap *sap, struct llc_addr *daddr,
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struct llc_addr *laddr);
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void llc_sap_add_socket(struct llc_sap *sap, struct sock *sk);
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void llc_sap_remove_socket(struct llc_sap *sap, struct sock *sk);
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u8 llc_data_accept_state(u8 state);
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void llc_build_offset_table(void);
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#endif /* LLC_CONN_H */
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