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Release 4.8 net/llc/llc_c_ev.c

Directory: net/llc
/*
 * llc_c_ev.c - Connection component state transition event qualifiers
 *
 * A 'state' consists of a number of possible event matching functions,
 * the actions associated with each being executed when that event is
 * matched; a 'state machine' accepts events in a serial fashion from an
 * event queue. Each event is passed to each successive event matching
 * function until a match is made (the event matching function returns
 * success, or '0') or the list of event matching functions is exhausted.
 * If a match is made, the actions associated with the event are executed
 * and the state is changed to that event's transition state. Before some
 * events are recognized, even after a match has been made, a certain
 * number of 'event qualifier' functions must also be executed. If these
 * all execute successfully, then the event is finally executed.
 *
 * These event functions must return 0 for success, to show a matched
 * event, of 1 if the event does not match. Event qualifier functions
 * must return a 0 for success or a non-zero for failure. Each function
 * is simply responsible for verifying one single thing and returning
 * either a success or failure.
 *
 * All of followed event functions are described in 802.2 LLC Protocol
 * standard document except two functions that we added that will explain
 * in their comments, at below.
 *
 * 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/netdevice.h>
#include <net/llc_conn.h>
#include <net/llc_sap.h>
#include <net/sock.h>
#include <net/llc_c_ac.h>
#include <net/llc_c_ev.h>
#include <net/llc_pdu.h>

#if 1

#define dprintk(args...) printk(KERN_DEBUG args)
#else

#define dprintk(args...)
#endif

/**
 *      llc_util_ns_inside_rx_window - check if sequence number is in rx window
 *      @ns: sequence number of received pdu.
 *      @vr: sequence number which receiver expects to receive.
 *      @rw: receive window size of receiver.
 *
 *      Checks if sequence number of received PDU is in range of receive
 *      window. Returns 0 for success, 1 otherwise
 */

static u16 llc_util_ns_inside_rx_window(u8 ns, u8 vr, u8 rw) { return !llc_circular_between(vr, ns, (vr + rw - 1) % LLC_2_SEQ_NBR_MODULO); }

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/** * llc_util_nr_inside_tx_window - check if sequence number is in tx window * @sk: current connection. * @nr: N(R) of received PDU. * * This routine checks if N(R) of received PDU is in range of transmit * window; on the other hand checks if received PDU acknowledges some * outstanding PDUs that are in transmit window. Returns 0 for success, 1 * otherwise. */
static u16 llc_util_nr_inside_tx_window(struct sock *sk, u8 nr) { u8 nr1, nr2; struct sk_buff *skb; struct llc_pdu_sn *pdu; struct llc_sock *llc = llc_sk(sk); int rc = 0; if (llc->dev->flags & IFF_LOOPBACK) goto out; rc = 1; if (skb_queue_empty(&llc->pdu_unack_q)) goto out; skb = skb_peek(&llc->pdu_unack_q); pdu = llc_pdu_sn_hdr(skb); nr1 = LLC_I_GET_NS(pdu); skb = skb_peek_tail(&llc->pdu_unack_q); pdu = llc_pdu_sn_hdr(skb); nr2 = LLC_I_GET_NS(pdu); rc = !llc_circular_between(nr1, nr, (nr2 + 1) % LLC_2_SEQ_NBR_MODULO); out: return rc; }

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int llc_conn_ev_conn_req(struct sock *sk, struct sk_buff *skb) { const struct llc_conn_state_ev *ev = llc_conn_ev(skb); return ev->prim == LLC_CONN_PRIM && ev->prim_type == LLC_PRIM_TYPE_REQ ? 0 : 1; }

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int llc_conn_ev_data_req(struct sock *sk, struct sk_buff *skb) { const struct llc_conn_state_ev *ev = llc_conn_ev(skb); return ev->prim == LLC_DATA_PRIM && ev->prim_type == LLC_PRIM_TYPE_REQ ? 0 : 1; }

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int llc_conn_ev_disc_req(struct sock *sk, struct sk_buff *skb) { const struct llc_conn_state_ev *ev = llc_conn_ev(skb); return ev->prim == LLC_DISC_PRIM && ev->prim_type == LLC_PRIM_TYPE_REQ ? 0 : 1; }

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int llc_conn_ev_rst_req(struct sock *sk, struct sk_buff *skb) { const struct llc_conn_state_ev *ev = llc_conn_ev(skb); return ev->prim == LLC_RESET_PRIM && ev->prim_type == LLC_PRIM_TYPE_REQ ? 0 : 1; }

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int llc_conn_ev_local_busy_detected(struct sock *sk, struct sk_buff *skb) { const struct llc_conn_state_ev *ev = llc_conn_ev(skb); return ev->type == LLC_CONN_EV_TYPE_SIMPLE && ev->prim_type == LLC_CONN_EV_LOCAL_BUSY_DETECTED ? 0 : 1; }

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int llc_conn_ev_local_busy_cleared(struct sock *sk, struct sk_buff *skb) { const struct llc_conn_state_ev *ev = llc_conn_ev(skb); return ev->type == LLC_CONN_EV_TYPE_SIMPLE && ev->prim_type == LLC_CONN_EV_LOCAL_BUSY_CLEARED ? 0 : 1; }

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int llc_conn_ev_rx_bad_pdu(struct sock *sk, struct sk_buff *skb) { return 1; }

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int llc_conn_ev_rx_disc_cmd_pbit_set_x(struct sock *sk, struct sk_buff *skb) { const struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb); return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_U(pdu) && LLC_U_PDU_CMD(pdu) == LLC_2_PDU_CMD_DISC ? 0 : 1; }

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int llc_conn_ev_rx_dm_rsp_fbit_set_x(struct sock *sk, struct sk_buff *skb) { const struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb); return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_U(pdu) && LLC_U_PDU_RSP(pdu) == LLC_2_PDU_RSP_DM ? 0 : 1; }

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int llc_conn_ev_rx_frmr_rsp_fbit_set_x(struct sock *sk, struct sk_buff *skb) { const struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb); return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_U(pdu) && LLC_U_PDU_RSP(pdu) == LLC_2_PDU_RSP_FRMR ? 0 : 1; }

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int llc_conn_ev_rx_i_cmd_pbit_set_0(struct sock *sk, struct sk_buff *skb) { const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); return llc_conn_space(sk, skb) && LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_I(pdu) && LLC_I_PF_IS_0(pdu) && LLC_I_GET_NS(pdu) == llc_sk(sk)->vR ? 0 : 1; }

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int llc_conn_ev_rx_i_cmd_pbit_set_1(struct sock *sk, struct sk_buff *skb) { const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); return llc_conn_space(sk, skb) && LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_I(pdu) && LLC_I_PF_IS_1(pdu) && LLC_I_GET_NS(pdu) == llc_sk(sk)->vR ? 0 : 1; }

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int llc_conn_ev_rx_i_cmd_pbit_set_0_unexpd_ns(struct sock *sk, struct sk_buff *skb) { const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); const u8 vr = llc_sk(sk)->vR; const u8 ns = LLC_I_GET_NS(pdu); return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_I(pdu) && LLC_I_PF_IS_0(pdu) && ns != vr && !llc_util_ns_inside_rx_window(ns, vr, llc_sk(sk)->rw) ? 0 : 1; }

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int llc_conn_ev_rx_i_cmd_pbit_set_1_unexpd_ns(struct sock *sk, struct sk_buff *skb) { const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); const u8 vr = llc_sk(sk)->vR; const u8 ns = LLC_I_GET_NS(pdu); return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_I(pdu) && LLC_I_PF_IS_1(pdu) && ns != vr && !llc_util_ns_inside_rx_window(ns, vr, llc_sk(sk)->rw) ? 0 : 1; }

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int llc_conn_ev_rx_i_cmd_pbit_set_x_inval_ns(struct sock *sk, struct sk_buff *skb) { const struct llc_pdu_sn * pdu = llc_pdu_sn_hdr(skb); const u8 vr = llc_sk(sk)->vR; const u8 ns = LLC_I_GET_NS(pdu); const u16 rc = LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_I(pdu) && ns != vr && llc_util_ns_inside_rx_window(ns, vr, llc_sk(sk)->rw) ? 0 : 1; if (!rc) dprintk("%s: matched, state=%d, ns=%d, vr=%d\n", __func__, llc_sk(sk)->state, ns, vr); return rc; }

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int llc_conn_ev_rx_i_rsp_fbit_set_0(struct sock *sk, struct sk_buff *skb) { const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); return llc_conn_space(sk, skb) && LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_I(pdu) && LLC_I_PF_IS_0(pdu) && LLC_I_GET_NS(pdu) == llc_sk(sk)->vR ? 0 : 1; }

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int llc_conn_ev_rx_i_rsp_fbit_set_1(struct sock *sk, struct sk_buff *skb) { const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_I(pdu) && LLC_I_PF_IS_1(pdu) && LLC_I_GET_NS(pdu) == llc_sk(sk)->vR ? 0 : 1; }

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int llc_conn_ev_rx_i_rsp_fbit_set_x(struct sock *sk, struct sk_buff *skb) { const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); return llc_conn_space(sk, skb) && LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_I(pdu) && LLC_I_GET_NS(pdu) == llc_sk(sk)->vR ? 0 : 1; }

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int llc_conn_ev_rx_i_rsp_fbit_set_0_unexpd_ns(struct sock *sk, struct sk_buff *skb) { const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); const u8 vr = llc_sk(sk)->vR; const u8 ns = LLC_I_GET_NS(pdu); return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_I(pdu) && LLC_I_PF_IS_0(pdu) && ns != vr && !llc_util_ns_inside_rx_window(ns, vr, llc_sk(sk)->rw) ? 0 : 1; }

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int llc_conn_ev_rx_i_rsp_fbit_set_1_unexpd_ns(struct sock *sk, struct sk_buff *skb) { const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); const u8 vr = llc_sk(sk)->vR; const u8 ns = LLC_I_GET_NS(pdu); return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_I(pdu) && LLC_I_PF_IS_1(pdu) && ns != vr && !llc_util_ns_inside_rx_window(ns, vr, llc_sk(sk)->rw) ? 0 : 1; }

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int llc_conn_ev_rx_i_rsp_fbit_set_x_unexpd_ns(struct sock *sk, struct sk_buff *skb) { const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); const u8 vr = llc_sk(sk)->vR; const u8 ns = LLC_I_GET_NS(pdu); return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_I(pdu) && ns != vr && !llc_util_ns_inside_rx_window(ns, vr, llc_sk(sk)->rw) ? 0 : 1; }

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int llc_conn_ev_rx_i_rsp_fbit_set_x_inval_ns(struct sock *sk, struct sk_buff *skb) { const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); const u8 vr = llc_sk(sk)->vR; const u8 ns = LLC_I_GET_NS(pdu); const u16 rc = LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_I(pdu) && ns != vr && llc_util_ns_inside_rx_window(ns, vr, llc_sk(sk)->rw) ? 0 : 1; if (!rc) dprintk("%s: matched, state=%d, ns=%d, vr=%d\n", __func__, llc_sk(sk)->state, ns, vr); return rc; }

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int llc_conn_ev_rx_rej_cmd_pbit_set_0(struct sock *sk, struct sk_buff *skb) { const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_S(pdu) && LLC_S_PF_IS_0(pdu) && LLC_S_PDU_CMD(pdu) == LLC_2_PDU_CMD_REJ ? 0 : 1; }

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int llc_conn_ev_rx_rej_cmd_pbit_set_1(struct sock *sk, struct sk_buff *skb) { const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_S(pdu) && LLC_S_PF_IS_1(pdu) && LLC_S_PDU_CMD(pdu) == LLC_2_PDU_CMD_REJ ? 0 : 1; }

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int llc_conn_ev_rx_rej_rsp_fbit_set_0(struct sock *sk, struct sk_buff *skb) { const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_S(pdu) && LLC_S_PF_IS_0(pdu) && LLC_S_PDU_RSP(pdu) == LLC_2_PDU_RSP_REJ ? 0 : 1; }

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int llc_conn_ev_rx_rej_rsp_fbit_set_1(struct sock *sk, struct sk_buff *skb) { const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_S(pdu) && LLC_S_PF_IS_1(pdu) && LLC_S_PDU_RSP(pdu) == LLC_2_PDU_RSP_REJ ? 0 : 1; }

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int llc_conn_ev_rx_rej_rsp_fbit_set_x(struct sock *sk, struct sk_buff *skb) { const struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb); return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_S(pdu) && LLC_S_PDU_RSP(pdu) == LLC_2_PDU_RSP_REJ ? 0 : 1; }

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int llc_conn_ev_rx_rnr_cmd_pbit_set_0(struct sock *sk, struct sk_buff *skb) { const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_S(pdu) && LLC_S_PF_IS_0(pdu) && LLC_S_PDU_CMD(pdu) == LLC_2_PDU_CMD_RNR ? 0 : 1; }

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int llc_conn_ev_rx_rnr_cmd_pbit_set_1(struct sock *sk, struct sk_buff *skb) { const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_S(pdu) && LLC_S_PF_IS_1(pdu) && LLC_S_PDU_CMD(pdu) == LLC_2_PDU_CMD_RNR ? 0 : 1; }

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int llc_conn_ev_rx_rnr_rsp_fbit_set_0(struct sock *sk, struct sk_buff *skb) { const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_S(pdu) && LLC_S_PF_IS_0(pdu) && LLC_S_PDU_RSP(pdu) == LLC_2_PDU_RSP_RNR ? 0 : 1; }

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int llc_conn_ev_rx_rnr_rsp_fbit_set_1(struct sock *sk, struct sk_buff *skb) { const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_S(pdu) && LLC_S_PF_IS_1(pdu) && LLC_S_PDU_RSP(pdu) == LLC_2_PDU_RSP_RNR ? 0 : 1; }

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int llc_conn_ev_rx_rr_cmd_pbit_set_0(struct sock *sk, struct sk_buff *skb) { const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_S(pdu) && LLC_S_PF_IS_0(pdu) && LLC_S_PDU_CMD(pdu) == LLC_2_PDU_CMD_RR ? 0 : 1; }

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int llc_conn_ev_rx_rr_cmd_pbit_set_1(struct sock *sk, struct sk_buff *skb) { const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_S(pdu) && LLC_S_PF_IS_1(pdu) && LLC_S_PDU_CMD(pdu) == LLC_2_PDU_CMD_RR ? 0 : 1; }

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int llc_conn_ev_rx_rr_rsp_fbit_set_0(struct sock *sk, struct sk_buff *skb) { const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); return llc_conn_space(sk, skb) && LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_S(pdu) && LLC_S_PF_IS_0(pdu) && LLC_S_PDU_RSP(pdu) == LLC_2_PDU_RSP_RR ? 0 : 1; }

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int llc_conn_ev_rx_rr_rsp_fbit_set_1(struct sock *sk, struct sk_buff *skb) { const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); return llc_conn_space(sk, skb) && LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_S(pdu) && LLC_S_PF_IS_1(pdu) && LLC_S_PDU_RSP(pdu) == LLC_2_PDU_RSP_RR ? 0 : 1; }

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int llc_conn_ev_rx_sabme_cmd_pbit_set_x(struct sock *sk, struct sk_buff *skb) { const struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb); return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_U(pdu) && LLC_U_PDU_CMD(pdu) == LLC_2_PDU_CMD_SABME ? 0 : 1; }

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int llc_conn_ev_rx_ua_rsp_fbit_set_x(struct sock *sk, struct sk_buff *skb) { struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb); return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_U(pdu) && LLC_U_PDU_RSP(pdu) == LLC_2_PDU_RSP_UA ? 0 : 1; }

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int llc_conn_ev_rx_xxx_cmd_pbit_set_1(struct sock *sk, struct sk_buff *skb) { u16 rc = 1; const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); if (LLC_PDU_IS_CMD(pdu)) { if (LLC_PDU_TYPE_IS_I(pdu) || LLC_PDU_TYPE_IS_S(pdu)) { if (LLC_I_PF_IS_1(pdu)) rc = 0; } else if (LLC_PDU_TYPE_IS_U(pdu) && LLC_U_PF_IS_1(pdu)) rc = 0; } return rc; }

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int llc_conn_ev_rx_xxx_cmd_pbit_set_x(struct sock *sk, struct sk_buff *skb) { u16 rc = 1; const struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb); if (LLC_PDU_IS_CMD(pdu)) { if (LLC_PDU_TYPE_IS_I(pdu) || LLC_PDU_TYPE_IS_S(pdu)) rc = 0; else if (LLC_PDU_TYPE_IS_U(pdu)) switch (LLC_U_PDU_CMD(pdu)) { case LLC_2_PDU_CMD_SABME: case LLC_2_PDU_CMD_DISC: rc = 0; break; } } return rc; }

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int llc_conn_ev_rx_xxx_rsp_fbit_set_x(struct sock *sk, struct sk_buff *skb) { u16 rc = 1; const struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb); if (LLC_PDU_IS_RSP(pdu)) { if (LLC_PDU_TYPE_IS_I(pdu) || LLC_PDU_TYPE_IS_S(pdu)) rc = 0; else if (LLC_PDU_TYPE_IS_U(pdu)) switch (LLC_U_PDU_RSP(pdu)) { case LLC_2_PDU_RSP_UA: case LLC_2_PDU_RSP_DM: case LLC_2_PDU_RSP_FRMR: rc = 0; break; } } return rc; }

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int llc_conn_ev_rx_zzz_cmd_pbit_set_x_inval_nr(struct sock *sk, struct sk_buff *skb) { u16 rc = 1; const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); const u8 vs = llc_sk(sk)->vS; const u8 nr = LLC_I_GET_NR(pdu); if (LLC_PDU_IS_CMD(pdu) && (LLC_PDU_TYPE_IS_I(pdu) || LLC_PDU_TYPE_IS_S(pdu)) && nr != vs && llc_util_nr_inside_tx_window(sk, nr)) { dprintk("%s: matched, state=%d, vs=%d, nr=%d\n", __func__, llc_sk(sk)->state, vs, nr); rc = 0; } return rc; }

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int llc_conn_ev_rx_zzz_rsp_fbit_set_x_inval_nr(struct sock *sk, struct sk_buff *skb) { u16 rc = 1; const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); const u8 vs = llc_sk(sk)->vS; const u8 nr = LLC_I_GET_NR(pdu); if (LLC_PDU_IS_RSP(pdu) && (LLC_PDU_TYPE_IS_I(pdu) || LLC_PDU_TYPE_IS_S(pdu)) && nr != vs && llc_util_nr_inside_tx_window(sk, nr)) { rc = 0; dprintk("%s: matched, state=%d, vs=%d, nr=%d\n", __func__, llc_sk(sk)->state, vs, nr); } return rc; }

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int llc_conn_ev_rx_any_frame(struct sock *sk, struct sk_buff *skb) { return 0; }

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int llc_conn_ev_p_tmr_exp(struct sock *sk, struct sk_buff *skb) { const struct llc_conn_state_ev *ev = llc_conn_ev(skb); return ev->type != LLC_CONN_EV_TYPE_P_TMR; }

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int llc_conn_ev_ack_tmr_exp(struct sock *sk, struct sk_buff *skb) { const struct llc_conn_state_ev *ev = llc_conn_ev(skb); return ev->type != LLC_CONN_EV_TYPE_ACK_TMR; }

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int llc_conn_ev_rej_tmr_exp(struct sock *sk, struct sk_buff *skb) { const struct llc_conn_state_ev *ev = llc_conn_ev(skb); return ev->type != LLC_CONN_EV_TYPE_REJ_TMR; }

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int llc_conn_ev_busy_tmr_exp(struct sock *sk,