/* * llc_c_ac.c - actions performed during connection state transition. * * Description: * Functions in this module are implementation of connection component actions * Details of actions can be found in IEEE-802.2 standard document. * All functions have one connection and one event as input argument. All of * them return 0 On success and 1 otherwise. * * Copyright (c) 1997 by Procom Technology, Inc. * 2001 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_main.h> #include <net/llc_c_ev.h> #include <net/llc_c_ac.h> #include <net/llc_c_st.h> #include <net/llc_pdu.h> #include <net/llc_mac.h> static void llc_conn_pf_cycle_tmr_cb(unsigned long timeout_data); static void llc_conn_ack_tmr_cb(unsigned long timeout_data); static void llc_conn_rej_tmr_cb(unsigned long timeout_data); static void llc_conn_busy_tmr_cb(unsigned long timeout_data); static int llc_conn_ac_inc_vs_by_1(struct sock *sk, struct llc_conn_state_ev *ev); static void llc_process_tmr_ev(struct sock *sk, struct llc_conn_state_ev *ev); static int llc_conn_ac_data_confirm(struct sock *sk, struct llc_conn_state_ev *ev); #define INCORRECT 0 int llc_conn_ac_clear_remote_busy(struct sock *sk, struct llc_conn_state_ev *ev) { struct llc_opt *llc = llc_sk(sk); if (llc->remote_busy_flag) { u8 nr; llc_pdu_sn_t *rx_pdu = (llc_pdu_sn_t *)ev->data.pdu.skb->nh.raw; llc->remote_busy_flag = 0; del_timer(&llc->busy_state_timer.timer); llc->busy_state_timer.running = 0; nr = LLC_I_GET_NR(rx_pdu); llc_conn_resend_i_pdu_as_cmd(sk, nr, 0); } return 0; } int llc_conn_ac_conn_ind(struct sock *sk, struct llc_conn_state_ev *ev) { int rc = 1; struct sk_buff *skb = ev->data.pdu.skb; union llc_u_prim_data *prim_data = llc_ind_prim.data; struct llc_prim_if_block *prim = &llc_ind_prim; struct llc_sap *sap; struct llc_opt *llc = llc_sk(sk); llc_pdu_decode_dsap(skb, &prim_data->conn.daddr.lsap); sap = llc_sap_find(prim_data->conn.daddr.lsap); if (sap) { llc_pdu_decode_sa(skb, llc->daddr.mac); llc_pdu_decode_da(skb, llc->laddr.mac); llc->dev = skb->dev; prim_data->conn.pri = 0; prim_data->conn.sk = sk; prim_data->conn.dev = skb->dev; memcpy(&prim_data->conn.daddr, &llc->laddr, sizeof(llc->laddr)); memcpy(&prim_data->conn.saddr, &llc->daddr, sizeof(llc->daddr)); prim->data = prim_data; prim->prim = LLC_CONN_PRIM; prim->sap = llc->sap; ev->flag = 1; ev->ind_prim = prim; rc = 0; } return rc; } int llc_conn_ac_conn_confirm(struct sock *sk, struct llc_conn_state_ev *ev) { union llc_u_prim_data *prim_data = llc_cfm_prim.data; struct sk_buff *skb = ev->data.pdu.skb; /* FIXME: wtf, this is global, so the whole thing is really * non reentrant... */ struct llc_prim_if_block *prim = &llc_cfm_prim; struct llc_opt *llc = llc_sk(sk); struct llc_sap *sap = llc->sap; prim_data->conn.sk = sk; prim_data->conn.pri = 0; prim_data->conn.status = ev->status; prim_data->conn.link = llc->link; if (skb) prim_data->conn.dev = skb->dev; else printk(KERN_ERR __FUNCTION__ "ev->data.pdu.skb == NULL\n"); prim->data = prim_data; prim->prim = LLC_CONN_PRIM; prim->sap = sap; ev->flag = 1; ev->cfm_prim = prim; return 0; } static int llc_conn_ac_data_confirm(struct sock *sk, struct llc_conn_state_ev *ev) { struct llc_prim_if_block *prim = &llc_cfm_prim; union llc_u_prim_data *prim_data = llc_cfm_prim.data; prim_data->data.sk = sk; prim_data->data.pri = 0; prim_data->data.link = llc_sk(sk)->link; prim_data->data.status = LLC_STATUS_RECEIVED; prim_data->data.skb = NULL; prim->data = prim_data; prim->prim = LLC_DATA_PRIM; prim->sap = llc_sk(sk)->sap; ev->flag = 1; ev->cfm_prim = prim; return 0; } int llc_conn_ac_data_ind(struct sock *sk, struct llc_conn_state_ev *ev) { llc_conn_rtn_pdu(sk, ev->data.pdu.skb, ev); return 0; } int llc_conn_ac_disc_ind(struct sock *sk, struct llc_conn_state_ev *ev) { u8 reason = 0; int rc = 1; union llc_u_prim_data *prim_data = llc_ind_prim.data; struct llc_prim_if_block *prim = &llc_ind_prim; if (ev->type == LLC_CONN_EV_TYPE_PDU) { llc_pdu_un_t *rx_pdu = (llc_pdu_un_t *)ev->data.pdu.skb->nh.raw; if (!LLC_PDU_IS_RSP(rx_pdu) && !LLC_PDU_TYPE_IS_U(rx_pdu) && LLC_U_PDU_RSP(rx_pdu) == LLC_2_PDU_RSP_DM) { reason = LLC_DISC_REASON_RX_DM_RSP_PDU; rc = 0; } else if (!LLC_PDU_IS_CMD(rx_pdu) && !LLC_PDU_TYPE_IS_U(rx_pdu) && LLC_U_PDU_CMD(rx_pdu) == LLC_2_PDU_CMD_DISC) { reason = LLC_DISC_REASON_RX_DISC_CMD_PDU; rc = 0; } } else if (ev->type == LLC_CONN_EV_TYPE_ACK_TMR) { reason = LLC_DISC_REASON_ACK_TMR_EXP; rc = 0; } else { reason = 0; rc = 1; } if (!rc) { prim_data->disc.sk = sk; prim_data->disc.reason = reason; prim_data->disc.link = llc_sk(sk)->link; prim->data = prim_data; prim->prim = LLC_DISC_PRIM; prim->sap = llc_sk(sk)->sap; ev->flag = 1; ev->ind_prim = prim; } return rc; } int llc_conn_ac_disc_confirm(struct sock *sk, struct llc_conn_state_ev *ev) { union llc_u_prim_data *prim_data = llc_cfm_prim.data; struct llc_prim_if_block *prim = &llc_cfm_prim; prim_data->disc.sk = sk; prim_data->disc.reason = ev->status; prim_data->disc.link = llc_sk(sk)->link; prim->data = prim_data; prim->prim = LLC_DISC_PRIM; prim->sap = llc_sk(sk)->sap; ev->flag = 1; ev->cfm_prim = prim; return 0; } int llc_conn_ac_rst_ind(struct sock *sk, struct llc_conn_state_ev *ev) { u8 reason = 0; int rc = 1; llc_pdu_un_t *rx_pdu = (llc_pdu_un_t *)ev->data.pdu.skb->nh.raw; union llc_u_prim_data *prim_data = llc_ind_prim.data; struct llc_prim_if_block *prim = &llc_ind_prim; struct llc_opt *llc = llc_sk(sk); switch (ev->type) { case LLC_CONN_EV_TYPE_PDU: if (!LLC_PDU_IS_RSP(rx_pdu) && !LLC_PDU_TYPE_IS_U(rx_pdu) && LLC_U_PDU_RSP(rx_pdu) == LLC_2_PDU_RSP_FRMR) { reason = LLC_RESET_REASON_LOCAL; rc = 0; } else if (!LLC_PDU_IS_CMD(rx_pdu) && !LLC_PDU_TYPE_IS_U(rx_pdu) && LLC_U_PDU_CMD(rx_pdu) == LLC_2_PDU_CMD_SABME) { reason = LLC_RESET_REASON_REMOTE; rc = 0; } else { reason = 0; rc = 1; } break; case LLC_CONN_EV_TYPE_ACK_TMR: case LLC_CONN_EV_TYPE_P_TMR: case LLC_CONN_EV_TYPE_REJ_TMR: case LLC_CONN_EV_TYPE_BUSY_TMR: if (llc->retry_count > llc->n2) { reason = LLC_RESET_REASON_LOCAL; rc = 0; } else rc = 1; break; } if (!rc) { prim_data->res.sk = sk; prim_data->res.reason = reason; prim_data->res.link = llc->link; prim->data = prim_data; prim->prim = LLC_RESET_PRIM; prim->sap = llc->sap; ev->flag = 1; ev->ind_prim = prim; } return rc; } int llc_conn_ac_rst_confirm(struct sock *sk, struct llc_conn_state_ev *ev) { union llc_u_prim_data *prim_data = llc_cfm_prim.data; struct llc_prim_if_block *prim = &llc_cfm_prim; prim_data->res.sk = sk; prim_data->res.link = llc_sk(sk)->link; prim->data = prim_data; prim->prim = LLC_RESET_PRIM; prim->sap = llc_sk(sk)->sap; ev->flag = 1; ev->cfm_prim = prim; return 0; } int llc_conn_ac_report_status(struct sock *sk, struct llc_conn_state_ev *ev) { return 0; } int llc_conn_ac_clear_remote_busy_if_f_eq_1(struct sock *sk, struct llc_conn_state_ev *ev) { llc_pdu_sn_t *rx_pdu = (llc_pdu_sn_t *)ev->data.pdu.skb->nh.raw; if (!LLC_PDU_IS_RSP(rx_pdu) && !LLC_PDU_TYPE_IS_I(rx_pdu) && !LLC_I_PF_IS_1(rx_pdu) && llc_sk(sk)->ack_pf) llc_conn_ac_clear_remote_busy(sk, ev); return 0; } int llc_conn_ac_stop_rej_tmr_if_data_flag_eq_2(struct sock *sk, struct llc_conn_state_ev *ev) { if (llc_sk(sk)->data_flag == 2) { del_timer(&llc_sk(sk)->rej_sent_timer.timer); llc_sk(sk)->rej_sent_timer.running = 0; } return 0; } int llc_conn_ac_send_disc_cmd_p_set_x(struct sock *sk, struct llc_conn_state_ev *ev) { int rc = 1; struct sk_buff *skb = llc_alloc_frame(); if (skb) { u8 p_bit = 1; struct llc_opt *llc = llc_sk(sk); struct llc_sap *sap = llc->sap; skb->dev = llc->dev; llc_pdu_header_init(skb, LLC_PDU_TYPE_U, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_CMD); llc_pdu_init_as_disc_cmd(skb, p_bit); lan_hdrs_init(skb, llc->dev->dev_addr, llc->daddr.mac); rc = 0; llc_conn_send_pdu(sk, skb); } llc_conn_ac_set_p_flag_1(sk, ev); return rc; } int llc_conn_ac_send_dm_rsp_f_set_p(struct sock *sk, struct llc_conn_state_ev *ev) { int rc = 1; struct sk_buff *skb = llc_alloc_frame(); if (skb) { struct llc_opt *llc = llc_sk(sk); struct llc_sap *sap = llc->sap; struct sk_buff *rx_skb = ev->data.pdu.skb; u8 f_bit; skb->dev = llc->dev; llc_pdu_decode_pf_bit(rx_skb, &f_bit); llc_pdu_header_init(skb, LLC_PDU_TYPE_U, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_RSP); llc_pdu_init_as_dm_rsp(skb, f_bit); lan_hdrs_init(skb, llc->dev->dev_addr, llc->daddr.mac); rc = 0; llc_conn_send_pdu(sk, skb); } return rc; } int llc_conn_ac_send_dm_rsp_f_set_1(struct sock *sk, struct llc_conn_state_ev *ev) { int rc = 1; struct sk_buff *skb = llc_alloc_frame(); if (skb) { struct llc_opt *llc = llc_sk(sk); struct llc_sap *sap = llc->sap; u8 f_bit = 1; skb->dev = llc->dev; llc_pdu_header_init(skb, LLC_PDU_TYPE_U, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_RSP); llc_pdu_init_as_dm_rsp(skb, f_bit); lan_hdrs_init(skb, llc->dev->dev_addr, llc->daddr.mac); rc = 0; llc_conn_send_pdu(sk, skb); } return rc; } int llc_conn_ac_send_dm_rsp_f_set_f_flag(struct sock *sk, struct llc_conn_state_ev *ev) { int rc = 1; struct sk_buff *skb = llc_alloc_frame(); if (skb) { struct llc_opt *llc = llc_sk(sk); struct llc_sap *sap = llc->sap; u8 f_bit = llc->f_flag; skb->dev = llc->dev; llc_pdu_header_init(skb, LLC_PDU_TYPE_U, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_RSP); llc_pdu_init_as_dm_rsp(skb, f_bit); lan_hdrs_init(skb, llc->dev->dev_addr, llc->daddr.mac); rc = 0; llc_conn_send_pdu(sk, skb); } return rc; } int llc_conn_ac_send_frmr_rsp_f_set_x(struct sock *sk, struct llc_conn_state_ev *ev) { u8 f_bit; int rc = 1; struct sk_buff *skb, *ev_skb = ev->data.pdu.skb; llc_pdu_sn_t *rx_pdu = (llc_pdu_sn_t *)ev_skb->nh.raw; struct llc_opt *llc = llc_sk(sk); llc->rx_pdu_hdr = (u32)*((u32 *)rx_pdu); if (!LLC_PDU_IS_CMD(rx_pdu)) llc_pdu_decode_pf_bit(ev_skb, &f_bit); else f_bit = 0; skb = llc_alloc_frame(); if (skb) { struct llc_sap *sap = llc->sap; skb->dev = llc->dev; llc_pdu_header_init(skb, LLC_PDU_TYPE_U, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_RSP); llc_pdu_init_as_frmr_rsp(skb, rx_pdu, f_bit, llc->vS, llc->vR, INCORRECT); lan_hdrs_init(skb, llc->dev->dev_addr, llc->daddr.mac); rc = 0; llc_conn_send_pdu(sk, skb); } return rc; } int llc_conn_ac_resend_frmr_rsp_f_set_0(struct sock *sk, struct llc_conn_state_ev *ev) { int rc = 1; struct sk_buff *skb = llc_alloc_frame(); if (skb) { u8 f_bit = 0; struct llc_opt *llc = llc_sk(sk); struct llc_sap *sap = llc->sap; llc_pdu_sn_t *rx_pdu = (llc_pdu_sn_t *)&llc->rx_pdu_hdr; skb->dev = llc->dev; llc_pdu_header_init(skb, LLC_PDU_TYPE_U, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_RSP); llc_pdu_init_as_frmr_rsp(skb, rx_pdu, f_bit, llc->vS, llc->vR, INCORRECT); lan_hdrs_init(skb, llc->dev->dev_addr, llc->daddr.mac); rc = 0; llc_conn_send_pdu(sk, skb); } return rc; } int llc_conn_ac_resend_frmr_rsp_f_set_p(struct sock *sk, struct llc_conn_state_ev *ev) { u8 f_bit; int rc = 1; struct sk_buff *skb; llc_pdu_decode_pf_bit(ev->data.pdu.skb, &f_bit); skb = llc_alloc_frame(); if (skb) { struct llc_opt *llc = llc_sk(sk); struct llc_sap *sap = llc->sap; llc_pdu_sn_t *rx_pdu = (llc_pdu_sn_t *)ev->data.pdu.skb->nh.raw; skb->dev = llc->dev; llc_pdu_header_init(skb, LLC_PDU_TYPE_U, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_RSP); llc_pdu_init_as_frmr_rsp(skb, rx_pdu, f_bit, llc->vS, llc->vR, INCORRECT); lan_hdrs_init(skb, llc->dev->dev_addr, llc->daddr.mac); rc = 0; llc_conn_send_pdu(sk, skb); } return rc; } int llc_conn_ac_send_i_cmd_p_set_1(struct sock *sk, struct llc_conn_state_ev *ev) { u8 p_bit = 1; struct sk_buff *skb = ev->data.prim.data->data->data.skb; struct llc_opt *llc = llc_sk(sk); struct llc_sap *sap = llc->sap; llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_CMD); llc_pdu_init_as_i_cmd(skb, p_bit, llc->vS, llc->vR); lan_hdrs_init(skb, llc->dev->dev_addr, llc->daddr.mac); llc_conn_send_pdu(sk, skb); llc_conn_ac_inc_vs_by_1(sk, ev); return 0; } int llc_conn_ac_send_i_cmd_p_set_0(struct sock *sk, struct llc_conn_state_ev *ev) { u8 p_bit = 0; struct sk_buff *skb = ev->data.prim.data->data->data.skb; struct llc_opt *llc = llc_sk(sk); struct llc_sap *sap = llc->sap; llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_CMD); llc_pdu_init_as_i_cmd(skb, p_bit, llc->vS, llc->vR); lan_hdrs_init(skb, llc->dev->dev_addr, llc->daddr.mac); llc_conn_send_pdu(sk, skb); llc_conn_ac_inc_vs_by_1(sk, ev); return 0; } int llc_conn_ac_resend_i_cmd_p_set_1(struct sock *sk, struct llc_conn_state_ev *ev) { llc_pdu_sn_t *rx_pdu = (llc_pdu_sn_t *)ev->data.pdu.skb->nh.raw; u8 nr = LLC_I_GET_NR(rx_pdu); llc_conn_resend_i_pdu_as_cmd(sk, nr, 1); return 0; } int llc_conn_ac_resend_i_cmd_p_set_1_or_send_rr(struct sock *sk, struct llc_conn_state_ev *ev) { llc_pdu_sn_t *rx_pdu = (llc_pdu_sn_t *)ev->data.pdu.skb->nh.raw; u8 nr = LLC_I_GET_NR(rx_pdu); int rc = llc_conn_ac_send_rr_cmd_p_set_1(sk, ev); if (!rc) llc_conn_resend_i_pdu_as_cmd(sk, nr, 0); return rc; } int llc_conn_ac_send_i_xxx_x_set_0(struct sock *sk, struct llc_conn_state_ev *ev) { u8 p_bit = 0; struct sk_buff *skb = ev->data.prim.data->data->data.skb; struct llc_opt *llc = llc_sk(sk); struct llc_sap *sap = llc->sap; llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_CMD); llc_pdu_init_as_i_cmd(skb, p_bit, llc->vS, llc->vR); lan_hdrs_init(skb, llc->dev->dev_addr, llc->daddr.mac); llc_conn_send_pdu(sk, skb); llc_conn_ac_inc_vs_by_1(sk, ev); return 0; } int llc_conn_ac_resend_i_xxx_x_set_0(struct sock *sk, struct llc_conn_state_ev *ev) { llc_pdu_sn_t *rx_pdu = (llc_pdu_sn_t *)ev->data.pdu.skb->nh.raw; u8 nr = LLC_I_GET_NR(rx_pdu); llc_conn_resend_i_pdu_as_cmd(sk, nr, 0); return 0; } int llc_conn_ac_resend_i_xxx_x_set_0_or_send_rr(struct sock *sk, struct llc_conn_state_ev *ev) { u8 nr; u8 f_bit = 0; llc_pdu_sn_t *rx_pdu = (llc_pdu_sn_t *)ev->data.pdu.skb->nh.raw; int rc = 1; struct sk_buff *skb = llc_alloc_frame(); if (skb) { struct llc_opt *llc = llc_sk(sk); struct llc_sap *sap = llc->sap; skb->dev = llc->dev; llc_pdu_header_init(skb, LLC_PDU_TYPE_U, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_RSP); llc_pdu_init_as_rr_rsp(skb, f_bit, llc->vR); lan_hdrs_init(skb, llc->dev->dev_addr, llc->daddr.mac); rc = 0; llc_conn_send_pdu(sk, skb); } if (rc) { nr = LLC_I_GET_NR(rx_pdu); rc = 0; llc_conn_resend_i_pdu_as_cmd(sk, nr, f_bit); } return rc; } int llc_conn_ac_resend_i_rsp_f_set_1(struct sock *sk, struct llc_conn_state_ev *ev) { llc_pdu_sn_t *rx_pdu = (llc_pdu_sn_t *)ev->data.pdu.skb->nh.raw; u8 nr = LLC_I_GET_NR(rx_pdu); llc_conn_resend_i_pdu_as_rsp(sk, nr, 1); return 0; } int llc_conn_ac_send_rej_cmd_p_set_1(struct sock *sk, struct llc_conn_state_ev *ev) { int rc = 1; struct sk_buff *skb = llc_alloc_frame(); if (skb) { struct llc_opt *llc = llc_sk(sk); struct llc_sap *sap = llc->sap; u8 p_bit = 1; skb->dev = llc->dev; llc_pdu_header_init(skb, LLC_PDU_TYPE_S, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_CMD); llc_pdu_init_as_rej_cmd(skb, p_bit, llc->vR); lan_hdrs_init(skb, llc->dev->dev_addr, llc->daddr.mac); rc = 0; llc_conn_send_pdu(sk, skb); } return rc; } int llc_conn_ac_send_rej_rsp_f_set_1(struct sock *sk, struct llc_conn_state_ev *ev) { int rc = 1; struct sk_buff *skb = llc_alloc_frame(); if (skb) { u8 f_bit = 1; struct llc_opt *llc = llc_sk(sk); struct llc_sap *sap = llc->sap; skb->dev = llc->dev; llc_pdu_header_init(skb, LLC_PDU_TYPE_S, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_RSP); llc_pdu_init_as_rej_rsp(skb, f_bit, llc->vR); lan_hdrs_init(skb, llc->dev->dev_addr, llc->daddr.mac); rc = 0; llc_conn_send_pdu(sk, skb); } return rc; } int llc_conn_ac_send_rej_xxx_x_set_0(struct sock *sk, struct llc_conn_state_ev *ev) { int rc = 1; struct sk_buff *skb = llc_alloc_frame(); if (skb) { struct llc_opt *llc = llc_sk(sk); struct llc_sap *sap = llc->sap; u8 f_bit = 0; skb->dev = llc->dev; llc_pdu_header_init(skb, LLC_PDU_TYPE_S, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_RSP); llc_pdu_init_as_rej_rsp(skb, f_bit, llc->vR); lan_hdrs_init(skb, llc->dev->dev_addr, llc->daddr.mac); rc = 0; llc_conn_send_pdu(sk, skb); } return rc; } int llc_conn_ac_send_rnr_cmd_p_set_1(struct sock *sk, struct llc_conn_state_ev *ev) { int rc = 1; struct sk_buff *skb = llc_alloc_frame(); if (skb) { struct llc_opt *llc = llc_sk(sk); struct llc_sap *sap = llc->sap; u8 p_bit = 1; skb->dev = llc->dev; llc_pdu_header_init(skb, LLC_PDU_TYPE_S, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_CMD); llc_pdu_init_as_rnr_cmd(skb, p_bit, llc->vR); lan_hdrs_init(skb, llc->dev->dev_addr, llc->daddr.mac); rc = 0; llc_conn_send_pdu(sk, skb); } return rc; } int llc_conn_ac_send_rnr_rsp_f_set_1(struct sock *sk, struct llc_conn_state_ev *ev) { int rc = 1; struct sk_buff *skb = llc_alloc_frame(); if (skb) { struct llc_opt *llc = llc_sk(sk); struct llc_sap *sap = llc->sap; u8 f_bit = 1; skb->dev = llc->dev; llc_pdu_header_init(skb, LLC_PDU_TYPE_S, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_RSP); llc_pdu_init_as_rnr_rsp(skb, f_bit, llc->vR); lan_hdrs_init(skb, llc->dev->dev_addr, llc->daddr.mac); rc = 0; llc_conn_send_pdu(sk, skb); } return rc; } int llc_conn_ac_send_rnr_xxx_x_set_0(struct sock *sk, struct llc_conn_state_ev *ev) { int rc = 1; struct sk_buff *skb = llc_alloc_frame(); if (skb) { u8 f_bit = 0; struct llc_opt *llc = llc_sk(sk); struct llc_sap *sap = llc->sap; skb->dev = llc->dev; llc_pdu_header_init(skb, LLC_PDU_TYPE_S, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_RSP); llc_pdu_init_as_rnr_rsp(skb, f_bit, llc->vR); lan_hdrs_init(skb, llc->dev->dev_addr, llc->daddr.mac); rc = 0; llc_conn_send_pdu(sk, skb); } return rc; } int llc_conn_ac_set_remote_busy(struct sock *sk, struct llc_conn_state_ev *ev) { struct llc_opt *llc = llc_sk(sk); if (!llc->remote_busy_flag) { llc->remote_busy_flag = 1; llc->busy_state_timer.timer.expires = jiffies + llc->busy_state_timer.expire * HZ; llc->busy_state_timer.timer.data = (unsigned long)sk; llc->busy_state_timer.timer.function = llc_conn_busy_tmr_cb; add_timer(&llc->busy_state_timer.timer); llc->busy_state_timer.running = 1; } return 0; } int llc_conn_ac_opt_send_rnr_xxx_x_set_0(struct sock *sk, struct llc_conn_state_ev *ev) { int rc = 1; struct sk_buff *skb = llc_alloc_frame(); if (skb) { struct llc_opt *llc = llc_sk(sk); struct llc_sap *sap = llc->sap; u8 f_bit = 0; skb->dev = llc->dev; llc_pdu_header_init(skb, LLC_PDU_TYPE_S, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_RSP); llc_pdu_init_as_rnr_rsp(skb, f_bit, llc->vR); lan_hdrs_init(skb, llc->dev->dev_addr, llc->daddr.mac); rc = 0; llc_conn_send_pdu(sk, skb); } return rc; } int llc_conn_ac_send_rr_cmd_p_set_1(struct sock *sk, struct llc_conn_state_ev *ev) { int rc = 1; struct sk_buff *skb = llc_alloc_frame(); if (skb) { u8 p_bit = 1; struct llc_opt *llc = llc_sk(sk); struct llc_sap *sap = llc->sap; skb->dev = llc->dev; llc_pdu_header_init(skb, LLC_PDU_TYPE_S, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_CMD); llc_pdu_init_as_rr_cmd(skb, p_bit, llc->vR); lan_hdrs_init(skb, llc->dev->dev_addr, llc->daddr.mac); rc = 0; llc_conn_send_pdu(sk, skb); } return rc; } int llc_conn_ac_send_ack_cmd_p_set_1(struct sock *sk, struct llc_conn_state_ev *ev) { int rc = 1; struct sk_buff *skb = llc_alloc_frame(); if (skb) { u8 p_bit = 1; struct llc_opt *llc = llc_sk(sk); struct llc_sap *sap = llc->sap; skb->dev = llc->dev; llc_pdu_header_init(skb, LLC_PDU_TYPE_S, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_CMD); llc_pdu_init_as_rr_cmd(skb, p_bit, llc->vR); lan_hdrs_init(skb, llc->dev->dev_addr, llc->daddr.mac); rc = 0; llc_conn_send_pdu(sk, skb); } return rc; } int llc_conn_ac_send_rr_rsp_f_set_1(struct sock *sk, struct llc_conn_state_ev *ev) { int rc = 1; struct sk_buff *skb = llc_alloc_frame(); if (skb) { struct llc_opt *llc = llc_sk(sk); struct llc_sap *sap = llc->sap; u8 f_bit = 1; skb->dev = llc->dev; llc_pdu_header_init(skb, LLC_PDU_TYPE_S, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_RSP); llc_pdu_init_as_rr_rsp(skb, f_bit, llc->vR); lan_hdrs_init(skb, llc->dev->dev_addr, llc->daddr.mac); rc = 0; llc_conn_send_pdu(sk, skb); } return rc; } int llc_conn_ac_send_ack_rsp_f_set_1(struct sock *sk, struct llc_conn_state_ev *ev) { int rc = 1; struct sk_buff *skb = llc_alloc_frame(); if (skb) { struct llc_opt *llc = llc_sk(sk); struct llc_sap *sap = llc->sap; u8 f_bit = 1; skb->dev = llc->dev; llc_pdu_header_init(skb, LLC_PDU_TYPE_S, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_RSP); llc_pdu_init_as_rr_rsp(skb, f_bit, llc->vR); lan_hdrs_init(skb, llc->dev->dev_addr, llc->daddr.mac); rc = 0; llc_conn_send_pdu(sk, skb); } return rc; } int llc_conn_ac_send_rr_xxx_x_set_0(struct sock *sk, struct llc_conn_state_ev *ev) { int rc = 1; struct sk_buff *skb = llc_alloc_frame(); if (skb) { struct llc_opt *llc = llc_sk(sk); struct llc_sap *sap = llc->sap; u8 f_bit = 0; skb->dev = llc->dev; llc_pdu_header_init(skb, LLC_PDU_TYPE_S, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_RSP); llc_pdu_init_as_rr_rsp(skb, f_bit, llc->vR); lan_hdrs_init(skb, llc->dev->dev_addr, llc->daddr.mac); rc = 0; llc_conn_send_pdu(sk, skb); } return rc; } int llc_conn_ac_send_ack_xxx_x_set_0(struct sock *sk, struct llc_conn_state_ev *ev) { int rc = 1; struct sk_buff *skb = llc_alloc_frame(); if (skb) { struct llc_opt *llc = llc_sk(sk); struct llc_sap *sap = llc->sap; u8 f_bit = 0; skb->dev = llc->dev; llc_pdu_header_init(skb, LLC_PDU_TYPE_S, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_RSP); llc_pdu_init_as_rr_rsp(skb, f_bit, llc->vR); lan_hdrs_init(skb, llc->dev->dev_addr, llc->daddr.mac); rc = 0; llc_conn_send_pdu(sk, skb); } return rc; } int llc_conn_ac_send_sabme_cmd_p_set_x(struct sock *sk, struct llc_conn_state_ev *ev) { int rc = 1; struct sk_buff *skb = llc_alloc_frame(); struct llc_opt *llc = llc_sk(sk); u8 p_bit = 1; if (skb) { struct llc_sap *sap = llc->sap; u8 *dmac = llc->daddr.mac; if (llc->dev->flags & IFF_LOOPBACK) dmac = llc->dev->dev_addr; skb->dev = llc->dev; llc_pdu_header_init(skb, LLC_PDU_TYPE_U, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_CMD); llc_pdu_init_as_sabme_cmd(skb, p_bit); lan_hdrs_init(skb, llc->dev->dev_addr, dmac); rc = 0; llc_conn_send_pdu(sk, skb); } llc->p_flag = p_bit; return rc; } int llc_conn_ac_send_ua_rsp_f_set_f_flag(struct sock *sk, struct llc_conn_state_ev *ev) { int rc = 1; struct sk_buff *skb = llc_alloc_frame(); if (skb) { struct llc_opt *llc = llc_sk(sk); struct llc_sap *sap = llc->sap; u8 f_bit = llc->f_flag; skb->dev = llc->dev; llc_pdu_header_init(skb, LLC_PDU_TYPE_U, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_RSP); llc_pdu_init_as_ua_rsp(skb, f_bit); lan_hdrs_init(skb, llc->dev->dev_addr, llc->daddr.mac); rc = 0; llc_conn_send_pdu(sk, skb); } return rc; } int llc_conn_ac_send_ua_rsp_f_set_p(struct sock *sk, struct llc_conn_state_ev *ev) { u8 f_bit; int rc = 1; struct sk_buff *rx_skb = ev->data.pdu.skb; struct sk_buff *skb; llc_pdu_decode_pf_bit(rx_skb, &f_bit); skb = llc_alloc_frame(); if (skb) { struct llc_opt *llc = llc_sk(sk); struct llc_sap *sap = llc->sap; skb->dev = llc->dev; llc_pdu_header_init(skb, LLC_PDU_TYPE_U, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_RSP); llc_pdu_init_as_ua_rsp(skb, f_bit); lan_hdrs_init(skb, llc->dev->dev_addr, llc->daddr.mac); rc = 0; llc_conn_send_pdu(sk, skb); } return rc; } int llc_conn_ac_set_s_flag_0(struct sock *sk, struct llc_conn_state_ev *ev) { llc_sk(sk)->s_flag = 0; return 0; } int llc_conn_ac_set_s_flag_1(struct sock *sk, struct llc_conn_state_ev *ev) { llc_sk(sk)->s_flag = 1; return 0; } int llc_conn_ac_start_p_timer(struct sock *sk, struct llc_conn_state_ev *ev) { struct llc_opt *llc = llc_sk(sk); llc->p_flag = 1; del_timer(&llc->pf_cycle_timer.timer); llc->pf_cycle_timer.timer.expires = jiffies + llc->pf_cycle_timer.expire * HZ; llc->pf_cycle_timer.timer.data = (unsigned long)sk; llc->pf_cycle_timer.timer.function = llc_conn_pf_cycle_tmr_cb; add_timer(&llc->pf_cycle_timer.timer); llc->pf_cycle_timer.running = 1; return 0; } /** * llc_conn_ac_send_ack_if_needed - check if ack is needed * @sk: current connection structure * @ev: current event * * Checks number of received PDUs which have not been acknowledged, yet, * If number of them reaches to "npta"(Number of PDUs To Acknowledge) then * sends an RR response as acknowledgement for them. Returns 0 for * success, 1 otherwise. */ int llc_conn_ac_send_ack_if_needed(struct sock *sk, struct llc_conn_state_ev *ev) { u8 pf_bit; struct sk_buff *skb = ev->data.pdu.skb; struct llc_opt *llc = llc_sk(sk); llc_pdu_decode_pf_bit(skb, &pf_bit); llc->ack_pf |= pf_bit & 1; if (!llc->ack_must_be_send) { llc->first_pdu_Ns = llc->vR; llc->ack_must_be_send = 1; llc->ack_pf = pf_bit & 1; } if (((llc->vR - llc->first_pdu_Ns + 129) % 128) >= llc->npta) { llc_conn_ac_send_rr_rsp_f_set_ackpf(sk, ev); llc->ack_must_be_send = 0; llc->ack_pf = 0; llc_conn_ac_inc_npta_value(sk, ev); } return 0; } /** * llc_conn_ac_rst_sendack_flag - resets ack_must_be_send flag * @sk: current connection structure * @ev: current event * * This action resets ack_must_be_send flag of given connection, this flag * indicates if there is any PDU which has not been acknowledged yet. * Returns 0 for success, 1 otherwise. */ int llc_conn_ac_rst_sendack_flag(struct sock *sk, struct llc_conn_state_ev *ev) { llc_sk(sk)->ack_must_be_send = llc_sk(sk)->ack_pf = 0; return 0; } /** * llc_conn_ac_send_i_rsp_f_set_ackpf - acknowledge received PDUs * @sk: current connection structure * @ev: current event * * Sends an I response PDU with f-bit set to ack_pf flag as acknowledge to * all received PDUs which have not been acknowledged, yet. ack_pf flag is * set to one if one PDU with p-bit set to one is received. Returns 0 for * success, 1 otherwise. */ int llc_conn_ac_send_i_rsp_f_set_ackpf(struct sock *sk, struct llc_conn_state_ev *ev) { struct sk_buff *skb = ev->data.prim.data->data->data.skb; struct llc_opt *llc = llc_sk(sk); u8 p_bit = llc->ack_pf; struct llc_sap *sap = llc->sap; llc_pdu_header_init(skb, LLC_PDU_TYPE_I, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_RSP); llc_pdu_init_as_i_cmd(skb, p_bit, llc->vS, llc->vR); lan_hdrs_init(skb, llc->dev->dev_addr, llc->daddr.mac); llc_conn_send_pdu(sk, skb); llc_conn_ac_inc_vs_by_1(sk, ev); return 0; } /** * llc_conn_ac_send_i_as_ack - sends an I-format PDU to acknowledge rx PDUs * @sk: current connection structure. * @ev: current event. * * This action sends an I-format PDU as acknowledge to received PDUs which * have not been acknowledged, yet, if there is any. By using of this * action number of acknowledgements decreases, this technic is called * piggy backing. Returns 0 for success, 1 otherwise. */ int llc_conn_ac_send_i_as_ack(struct sock *sk, struct llc_conn_state_ev *ev) { struct llc_opt *llc = llc_sk(sk); if (llc->ack_must_be_send) { llc_conn_ac_send_i_rsp_f_set_ackpf(sk, ev); llc->ack_must_be_send = 0 ; llc->ack_pf = 0; } else llc_conn_ac_send_i_cmd_p_set_0(sk, ev); return 0; } /** * llc_conn_ac_send_rr_rsp_f_set_ackpf - ack all rx PDUs not yet acked * @sk: current connection structure. * @ev: current event. * * This action sends an RR response with f-bit set to ack_pf flag as * acknowledge to all received PDUs which have not been acknowledged, yet, * if there is any. ack_pf flag indicates if a PDU has been received with * p-bit set to one. Returns 0 for success, 1 otherwise. */ int llc_conn_ac_send_rr_rsp_f_set_ackpf(struct sock *sk, struct llc_conn_state_ev *ev) { int rc = 1; struct sk_buff *skb = llc_alloc_frame(); if (skb) { struct llc_opt *llc = llc_sk(sk); struct llc_sap *sap = llc->sap; u8 f_bit = llc->ack_pf; skb->dev = llc->dev; llc_pdu_header_init(skb, LLC_PDU_TYPE_S, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_RSP); llc_pdu_init_as_rr_rsp(skb, f_bit, llc->vR); lan_hdrs_init(skb, llc->dev->dev_addr, llc->daddr.mac); rc = 0; llc_conn_send_pdu(sk, skb); } return rc; } /** * llc_conn_ac_inc_npta_value - tries to make value of npta greater * @sk: current connection structure. * @ev: current event. * * After "inc_cntr" times calling of this action, "npta" increase by one. * this action tries to make vale of "npta" greater as possible; number of * acknowledgements decreases by increasing of "npta". Returns 0 for * success, 1 otherwise. */ int llc_conn_ac_inc_npta_value(struct sock *sk, struct llc_conn_state_ev *ev) { struct llc_opt *llc = llc_sk(sk); if (!llc->inc_cntr) { llc->dec_step = 0; llc->dec_cntr = llc->inc_cntr = 2; ++llc->npta; if (llc->npta > 127) llc->npta = 127 ; } else --llc->inc_cntr; return 0; } /** * llc_conn_ac_adjust_npta_by_rr - decreases "npta" by one * @sk: current connection structure. * @ev: current event. * * After receiving "dec_cntr" times RR command, this action decreases * "npta" by one. Returns 0 for success, 1 otherwise. */ int llc_conn_ac_adjust_npta_by_rr(struct sock *sk, struct llc_conn_state_ev *ev) { struct llc_opt *llc = llc_sk(sk); if (!llc->connect_step && !llc->remote_busy_flag) { if (!llc->dec_step) { if (!llc->dec_cntr) { llc->inc_cntr = llc->dec_cntr = 2; if (llc->npta > 0) llc->npta = llc->npta - 1; } else llc->dec_cntr -=1; } } else llc->connect_step = 0 ; return 0; } /** * llc_conn_ac_adjust_npta_by_rnr - decreases "npta" by one * @sk: current connection structure. * @ev: current event. * * After receiving "dec_cntr" times RNR command, this action decreases * "npta" by one. Returns 0 for success, 1 otherwise. */ int llc_conn_ac_adjust_npta_by_rnr(struct sock *sk, struct llc_conn_state_ev *ev) { struct llc_opt *llc = llc_sk(sk); if (llc->remote_busy_flag) if (!llc->dec_step) { if (!llc->dec_cntr) { llc->inc_cntr = llc->dec_cntr = 2; if (llc->npta > 0) --llc->npta; } else --llc->dec_cntr; } return 0; } /** * llc_conn_ac_dec_tx_win_size - decreases tx window size * @sk: current connection structure. * @ev: current event. * * After receiving of a REJ command or response, transmit window size is * decreased by number of PDUs which are outstanding yet. Returns 0 for * success, 1 otherwise. */ int llc_conn_ac_dec_tx_win_size(struct sock *sk, struct llc_conn_state_ev *ev) { struct llc_opt *llc = llc_sk(sk); u8 unacked_pdu = skb_queue_len(&llc->pdu_unack_q); llc->k -= unacked_pdu; if (llc->k < 2) llc->k = 2; return 0; } /** * llc_conn_ac_inc_tx_win_size - tx window size is inc by 1 * @sk: current connection structure. * @ev: current event. * * After receiving an RR response with f-bit set to one, transmit window * size is increased by one. Returns 0 for success, 1 otherwise. */ int llc_conn_ac_inc_tx_win_size(struct sock *sk, struct llc_conn_state_ev *ev) { struct llc_opt *llc = llc_sk(sk); llc->k += 1; if (llc->k > 128) llc->k = 128 ; return 0; } int llc_conn_ac_stop_all_timers(struct sock *sk, struct llc_conn_state_ev *ev) { struct llc_opt *llc = llc_sk(sk); del_timer(&llc->pf_cycle_timer.timer); llc->pf_cycle_timer.running = 0; del_timer(&llc->ack_timer.timer); llc->ack_timer.running = 0; del_timer(&llc->rej_sent_timer.timer); llc->rej_sent_timer.running = 0; del_timer(&llc->busy_state_timer.timer); llc->busy_state_timer.running = 0; llc->ack_must_be_send = 0; llc->ack_pf = 0; return 0; } int llc_conn_ac_stop_other_timers(struct sock *sk, struct llc_conn_state_ev *ev) { struct llc_opt *llc = llc_sk(sk); del_timer(&llc->rej_sent_timer.timer); llc->rej_sent_timer.running = 0; del_timer(&llc->pf_cycle_timer.timer); llc->pf_cycle_timer.running = 0; del_timer(&llc->busy_state_timer.timer); llc->busy_state_timer.running = 0; llc->ack_must_be_send = 0; llc->ack_pf = 0; return 0; } int llc_conn_ac_start_ack_timer(struct sock *sk, struct llc_conn_state_ev *ev) { struct llc_opt *llc = llc_sk(sk); del_timer(&llc->ack_timer.timer); llc->ack_timer.timer.expires = jiffies + llc->ack_timer.expire * HZ; llc->ack_timer.timer.data = (unsigned long)sk; llc->ack_timer.timer.function = llc_conn_ack_tmr_cb; add_timer(&llc->ack_timer.timer); llc->ack_timer.running = 1; return 0; } int llc_conn_ac_start_rej_timer(struct sock *sk, struct llc_conn_state_ev *ev) { struct llc_opt *llc = llc_sk(sk); del_timer(&llc->rej_sent_timer.timer); llc->rej_sent_timer.timer.expires = jiffies + llc->rej_sent_timer.expire * HZ; llc->rej_sent_timer.timer.data = (unsigned long)sk; llc->rej_sent_timer.timer.function = llc_conn_rej_tmr_cb; add_timer(&llc->rej_sent_timer.timer); llc->rej_sent_timer.running = 1; return 0; } int llc_conn_ac_start_ack_tmr_if_not_running(struct sock *sk, struct llc_conn_state_ev *ev) { struct llc_opt *llc = llc_sk(sk); if (!llc->ack_timer.running) { llc->ack_timer.timer.expires = jiffies + llc->ack_timer.expire * HZ; llc->ack_timer.timer.data = (unsigned long)sk; llc->ack_timer.timer.function = llc_conn_ack_tmr_cb; add_timer(&llc->ack_timer.timer); llc->ack_timer.running = 1; } return 0; } int llc_conn_ac_stop_ack_timer(struct sock *sk, struct llc_conn_state_ev *ev) { del_timer(&llc_sk(sk)->ack_timer.timer); llc_sk(sk)->ack_timer.running = 0; return 0; } int llc_conn_ac_stop_p_timer(struct sock *sk, struct llc_conn_state_ev *ev) { struct llc_opt *llc = llc_sk(sk); del_timer(&llc->pf_cycle_timer.timer); llc->pf_cycle_timer.running = 0; llc->p_flag = 0; return 0; } int llc_conn_ac_stop_rej_timer(struct sock *sk, struct llc_conn_state_ev *ev) { del_timer(&llc_sk(sk)->rej_sent_timer.timer); llc_sk(sk)->rej_sent_timer.running = 0; return 0; } int llc_conn_ac_upd_nr_received(struct sock *sk, struct llc_conn_state_ev *ev) { int acked; u16 unacked = 0; u8 fbit; struct sk_buff *skb = ev->data.pdu.skb; llc_pdu_sn_t *rx_pdu = (llc_pdu_sn_t *)skb->nh.raw; struct llc_opt *llc = llc_sk(sk); llc->last_nr = PDU_SUPV_GET_Nr(rx_pdu); acked = llc_conn_remove_acked_pdus(sk, llc->last_nr, &unacked); /* On loopback we don't queue I frames in unack_pdu_q queue. */ if (acked > 0 || (llc->dev->flags & IFF_LOOPBACK)) { llc->retry_count = 0; del_timer(&llc->ack_timer.timer); llc->ack_timer.running = 0; if (llc->failed_data_req) { /* already, we did not accept data from upper layer * (tx_window full or unacceptable state). Now, we * can send data and must inform to upper layer. */ llc->failed_data_req = 0; llc_conn_ac_data_confirm(sk, ev); } if (unacked) { llc->ack_timer.timer.expires = jiffies + llc->ack_timer.expire * HZ; llc->ack_timer.timer.data = (unsigned long)sk; llc->ack_timer.timer.function = llc_conn_ack_tmr_cb; add_timer(&llc->ack_timer.timer); llc->ack_timer.running = 1; } } else if (llc->failed_data_req) { llc_pdu_decode_pf_bit(skb, &fbit); if (fbit == 1) { llc->failed_data_req = 0; llc_conn_ac_data_confirm(sk, ev); } } return 0; } int llc_conn_ac_upd_p_flag(struct sock *sk, struct llc_conn_state_ev *ev) { struct sk_buff *skb = ev->data.pdu.skb; llc_pdu_sn_t *rx_pdu = (llc_pdu_sn_t *)skb->nh.raw; u8 f_bit; if (!LLC_PDU_IS_RSP(rx_pdu) && !llc_pdu_decode_pf_bit(skb, &f_bit) && f_bit) { llc_sk(sk)->p_flag = 0; llc_conn_ac_stop_p_timer(sk, ev); } return 0; } int llc_conn_ac_set_data_flag_2(struct sock *sk, struct llc_conn_state_ev *ev) { llc_sk(sk)->data_flag = 2; return 0; } int llc_conn_ac_set_data_flag_0(struct sock *sk, struct llc_conn_state_ev *ev) { llc_sk(sk)->data_flag = 0; return 0; } int llc_conn_ac_set_data_flag_1(struct sock *sk, struct llc_conn_state_ev *ev) { llc_sk(sk)->data_flag = 1; return 0; } int llc_conn_ac_set_data_flag_1_if_data_flag_eq_0(struct sock *sk, struct llc_conn_state_ev *ev) { if (!llc_sk(sk)->data_flag) llc_sk(sk)->data_flag = 1; return 0; } int llc_conn_ac_set_p_flag_0(struct sock *sk, struct llc_conn_state_ev *ev) { llc_sk(sk)->p_flag = 0; return 0; } int llc_conn_ac_set_p_flag_1(struct sock *sk, struct llc_conn_state_ev *ev) { llc_sk(sk)->p_flag = 1; return 0; } int llc_conn_ac_set_remote_busy_0(struct sock *sk, struct llc_conn_state_ev *ev) { llc_sk(sk)->remote_busy_flag = 0; return 0; } int llc_conn_ac_set_cause_flag_0(struct sock *sk, struct llc_conn_state_ev *ev) { llc_sk(sk)->cause_flag = 0; return 0; } int llc_conn_ac_set_cause_flag_1(struct sock *sk, struct llc_conn_state_ev *ev) { llc_sk(sk)->cause_flag = 1; return 0; } int llc_conn_ac_set_retry_cnt_0(struct sock *sk, struct llc_conn_state_ev *ev) { llc_sk(sk)->retry_count = 0; return 0; } int llc_conn_ac_inc_retry_cnt_by_1(struct sock *sk, struct llc_conn_state_ev *ev) { llc_sk(sk)->retry_count++; return 0; } int llc_conn_ac_set_vr_0(struct sock *sk, struct llc_conn_state_ev *ev) { llc_sk(sk)->vR = 0; return 0; } int llc_conn_ac_inc_vr_by_1(struct sock *sk, struct llc_conn_state_ev *ev) { llc_sk(sk)->vR = PDU_GET_NEXT_Vr(llc_sk(sk)->vR); return 0; } int llc_conn_ac_set_vs_0(struct sock *sk, struct llc_conn_state_ev *ev) { llc_sk(sk)->vS = 0; return 0; } int llc_conn_ac_set_vs_nr(struct sock *sk, struct llc_conn_state_ev *ev) { llc_sk(sk)->vS = llc_sk(sk)->last_nr; return 0; } int llc_conn_ac_inc_vs_by_1(struct sock *sk, struct llc_conn_state_ev *ev) { llc_sk(sk)->vS = (llc_sk(sk)->vS + 1) % 128; return 0; } int llc_conn_ac_set_f_flag_p(struct sock *sk, struct llc_conn_state_ev *ev) { llc_pdu_decode_pf_bit(ev->data.pdu.skb, &llc_sk(sk)->f_flag); return 0; } void llc_conn_pf_cycle_tmr_cb(unsigned long timeout_data) { struct sock *sk = (struct sock *)timeout_data; struct llc_conn_state_ev *ev; llc_sk(sk)->pf_cycle_timer.running = 0; ev = llc_conn_alloc_ev(sk); if (ev) { ev->type = LLC_CONN_EV_TYPE_P_TMR; ev->data.tmr.timer_specific = NULL; llc_process_tmr_ev(sk, ev); } } static void llc_conn_busy_tmr_cb(unsigned long timeout_data) { struct sock *sk = (struct sock *)timeout_data; struct llc_conn_state_ev *ev; llc_sk(sk)->busy_state_timer.running = 0; ev = llc_conn_alloc_ev(sk); if (ev) { ev->type = LLC_CONN_EV_TYPE_BUSY_TMR; ev->data.tmr.timer_specific = NULL; llc_process_tmr_ev(sk, ev); } } void llc_conn_ack_tmr_cb(unsigned long timeout_data) { struct sock* sk = (struct sock *)timeout_data; struct llc_conn_state_ev *ev; llc_sk(sk)->ack_timer.running = 0; ev = llc_conn_alloc_ev(sk); if (ev) { ev->type = LLC_CONN_EV_TYPE_ACK_TMR; ev->data.tmr.timer_specific = NULL; llc_process_tmr_ev(sk, ev); } } static void llc_conn_rej_tmr_cb(unsigned long timeout_data) { struct sock *sk = (struct sock *)timeout_data; struct llc_conn_state_ev *ev; llc_sk(sk)->rej_sent_timer.running = 0; ev = llc_conn_alloc_ev(sk); if (ev) { ev->type = LLC_CONN_EV_TYPE_REJ_TMR; ev->data.tmr.timer_specific = NULL; llc_process_tmr_ev(sk, ev); } } int llc_conn_ac_rst_vs(struct sock *sk, struct llc_conn_state_ev *ev) { llc_sk(sk)->X = llc_sk(sk)->vS; llc_conn_ac_set_vs_nr(sk, ev); return 0; } int llc_conn_ac_upd_vs(struct sock *sk, struct llc_conn_state_ev *ev) { llc_pdu_sn_t *rx_pdu = (llc_pdu_sn_t *)ev->data.pdu.skb->nh.raw; u8 nr = PDU_SUPV_GET_Nr(rx_pdu); if (llc_circular_between(llc_sk(sk)->vS, nr, llc_sk(sk)->X)) llc_conn_ac_set_vs_nr(sk, ev); return 0; } /* * Non-standard actions; these not contained in IEEE specification; for * our own usage */ /** * llc_conn_disc - removes connection from SAP list and frees it * @sk: closed connection * @ev: occurred event * * Returns 2, to indicate the state machine that the connection was freed. */ int llc_conn_disc(struct sock *sk, struct llc_conn_state_ev *ev) { llc_sap_unassign_sock(llc_sk(sk)->sap, sk); llc_sock_free(sk); return 2; } /** * llc_conn_reset - resets connection * @sk : reseting connection. * @ev: occurred event. * * Stop all timers, empty all queues and reset all flags. */ int llc_conn_reset(struct sock *sk, struct llc_conn_state_ev *ev) { llc_sock_reset(sk); return 0; } /** * llc_circular_between - designates that b is between a and c or not * @a: lower bound * @b: element to see if is between a and b * @c: upper bound * * This function designates that b is between a and c or not (for example, * 0 is between 127 and 1). Returns 1 if b is between a and c, 0 * otherwise. */ u8 llc_circular_between(u8 a, u8 b, u8 c) { b = b - a; c = c - a; return b <= c; } /** * llc_process_tmr_ev - timer backend * @sk: active connection * @ev: occurred event * * This function is called from timer callback functions. When connection * is busy (during sending a data frame) timer expiration event must be * queued. Otherwise this event can be sent to connection state machine. * Queued events will process by process_rxframes_events function after * sending data frame. Returns 0 for success, 1 otherwise. */ static void llc_process_tmr_ev(struct sock *sk, struct llc_conn_state_ev *ev) { bh_lock_sock(sk); if (llc_sk(sk)->state == LLC_CONN_OUT_OF_SVC) { printk(KERN_WARNING "timer called on closed connection\n"); llc_conn_free_ev(ev); goto out; } if (!sk->lock.users) llc_conn_send_ev(sk, ev); else { struct sk_buff *skb = alloc_skb(1, GFP_ATOMIC); if (skb) { skb->cb[0] = LLC_EVENT; skb->data = (void *)ev; sk_add_backlog(sk, skb); } else llc_conn_free_ev(ev); } out: bh_unlock_sock(sk); }