/* * 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. * 2001-2003 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 <linux/slab.h> #include <net/llc_conn.h> #include <net/llc_sap.h> #include <net/sock.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.h> static int llc_conn_ac_inc_vs_by_1(struct sock *sk, struct sk_buff *skb); static void llc_process_tmr_ev(struct sock *sk, struct sk_buff *skb); static int llc_conn_ac_data_confirm(struct sock *sk, struct sk_buff *ev); static int llc_conn_ac_inc_npta_value(struct sock *sk, struct sk_buff *skb); static int llc_conn_ac_send_rr_rsp_f_set_ackpf(struct sock *sk, struct sk_buff *skb); static int llc_conn_ac_set_p_flag_1(struct sock *sk, struct sk_buff *skb); #define INCORRECT 0 int llc_conn_ac_clear_remote_busy(struct sock *sk, struct sk_buff *skb) { struct llc_sock *llc = llc_sk(sk); if (llc->remote_busy_flag) { u8 nr; struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); llc->remote_busy_flag = 0; del_timer(&llc->busy_state_timer.timer); nr = LLC_I_GET_NR(pdu); llc_conn_resend_i_pdu_as_cmd(sk, nr, 0); } return 0; } int llc_conn_ac_conn_ind(struct sock *sk, struct sk_buff *skb) { struct llc_conn_state_ev *ev = llc_conn_ev(skb); ev->ind_prim = LLC_CONN_PRIM; return 0; } int llc_conn_ac_conn_confirm(struct sock *sk, struct sk_buff *skb) { struct llc_conn_state_ev *ev = llc_conn_ev(skb); ev->cfm_prim = LLC_CONN_PRIM; return 0; } static int llc_conn_ac_data_confirm(struct sock *sk, struct sk_buff *skb) { struct llc_conn_state_ev *ev = llc_conn_ev(skb); ev->cfm_prim = LLC_DATA_PRIM; return 0; } int llc_conn_ac_data_ind(struct sock *sk, struct sk_buff *skb) { llc_conn_rtn_pdu(sk, skb); return 0; } int llc_conn_ac_disc_ind(struct sock *sk, struct sk_buff *skb) { struct llc_conn_state_ev *ev = llc_conn_ev(skb); u8 reason = 0; int rc = 0; if (ev->type == LLC_CONN_EV_TYPE_PDU) { struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb); if (LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_U(pdu) && LLC_U_PDU_RSP(pdu) == LLC_2_PDU_RSP_DM) reason = LLC_DISC_REASON_RX_DM_RSP_PDU; else if (LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_U(pdu) && LLC_U_PDU_CMD(pdu) == LLC_2_PDU_CMD_DISC) reason = LLC_DISC_REASON_RX_DISC_CMD_PDU; } else if (ev->type == LLC_CONN_EV_TYPE_ACK_TMR) reason = LLC_DISC_REASON_ACK_TMR_EXP; else rc = -EINVAL; if (!rc) { ev->reason = reason; ev->ind_prim = LLC_DISC_PRIM; } return rc; } int llc_conn_ac_disc_confirm(struct sock *sk, struct sk_buff *skb) { struct llc_conn_state_ev *ev = llc_conn_ev(skb); ev->reason = ev->status; ev->cfm_prim = LLC_DISC_PRIM; return 0; } int llc_conn_ac_rst_ind(struct sock *sk, struct sk_buff *skb) { u8 reason = 0; int rc = 1; struct llc_conn_state_ev *ev = llc_conn_ev(skb); struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb); struct llc_sock *llc = llc_sk(sk); switch (ev->type) { case LLC_CONN_EV_TYPE_PDU: if (LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_U(pdu) && LLC_U_PDU_RSP(pdu) == LLC_2_PDU_RSP_FRMR) { reason = LLC_RESET_REASON_LOCAL; rc = 0; } else if (LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_U(pdu) && LLC_U_PDU_CMD(pdu) == LLC_2_PDU_CMD_SABME) { reason = LLC_RESET_REASON_REMOTE; rc = 0; } 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; } break; } if (!rc) { ev->reason = reason; ev->ind_prim = LLC_RESET_PRIM; } return rc; } int llc_conn_ac_rst_confirm(struct sock *sk, struct sk_buff *skb) { struct llc_conn_state_ev *ev = llc_conn_ev(skb); ev->reason = 0; ev->cfm_prim = LLC_RESET_PRIM; return 0; } int llc_conn_ac_clear_remote_busy_if_f_eq_1(struct sock *sk, struct sk_buff *skb) { struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); if (LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_I(pdu) && LLC_I_PF_IS_1(pdu) && llc_sk(sk)->ack_pf) llc_conn_ac_clear_remote_busy(sk, skb); return 0; } int llc_conn_ac_stop_rej_tmr_if_data_flag_eq_2(struct sock *sk, struct sk_buff *skb) { struct llc_sock *llc = llc_sk(sk); if (llc->data_flag == 2) del_timer(&llc->rej_sent_timer.timer); return 0; } int llc_conn_ac_send_disc_cmd_p_set_x(struct sock *sk, struct sk_buff *skb) { int rc = -ENOBUFS; struct llc_sock *llc = llc_sk(sk); struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0); if (nskb) { struct llc_sap *sap = llc->sap; llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_CMD); llc_pdu_init_as_disc_cmd(nskb, 1); rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); if (unlikely(rc)) goto free; llc_conn_send_pdu(sk, nskb); llc_conn_ac_set_p_flag_1(sk, skb); } out: return rc; free: kfree_skb(nskb); goto out; } int llc_conn_ac_send_dm_rsp_f_set_p(struct sock *sk, struct sk_buff *skb) { int rc = -ENOBUFS; struct llc_sock *llc = llc_sk(sk); struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0); if (nskb) { struct llc_sap *sap = llc->sap; u8 f_bit; llc_pdu_decode_pf_bit(skb, &f_bit); llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_RSP); llc_pdu_init_as_dm_rsp(nskb, f_bit); rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); if (unlikely(rc)) goto free; llc_conn_send_pdu(sk, nskb); } out: return rc; free: kfree_skb(nskb); goto out; } int llc_conn_ac_send_dm_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) { int rc = -ENOBUFS; struct llc_sock *llc = llc_sk(sk); struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0); if (nskb) { struct llc_sap *sap = llc->sap; llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_RSP); llc_pdu_init_as_dm_rsp(nskb, 1); rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); if (unlikely(rc)) goto free; llc_conn_send_pdu(sk, nskb); } out: return rc; free: kfree_skb(nskb); goto out; } int llc_conn_ac_send_frmr_rsp_f_set_x(struct sock *sk, struct sk_buff *skb) { u8 f_bit; int rc = -ENOBUFS; struct sk_buff *nskb; struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); struct llc_sock *llc = llc_sk(sk); llc->rx_pdu_hdr = *((u32 *)pdu); if (LLC_PDU_IS_CMD(pdu)) llc_pdu_decode_pf_bit(skb, &f_bit); else f_bit = 0; nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, sizeof(struct llc_frmr_info)); if (nskb) { struct llc_sap *sap = llc->sap; llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_RSP); llc_pdu_init_as_frmr_rsp(nskb, pdu, f_bit, llc->vS, llc->vR, INCORRECT); rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); if (unlikely(rc)) goto free; llc_conn_send_pdu(sk, nskb); } out: return rc; free: kfree_skb(nskb); goto out; } int llc_conn_ac_resend_frmr_rsp_f_set_0(struct sock *sk, struct sk_buff *skb) { int rc = -ENOBUFS; struct llc_sock *llc = llc_sk(sk); struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, sizeof(struct llc_frmr_info)); if (nskb) { struct llc_sap *sap = llc->sap; struct llc_pdu_sn *pdu = (struct llc_pdu_sn *)&llc->rx_pdu_hdr; llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_RSP); llc_pdu_init_as_frmr_rsp(nskb, pdu, 0, llc->vS, llc->vR, INCORRECT); rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); if (unlikely(rc)) goto free; llc_conn_send_pdu(sk, nskb); } out: return rc; free: kfree_skb(nskb); goto out; } int llc_conn_ac_resend_frmr_rsp_f_set_p(struct sock *sk, struct sk_buff *skb) { u8 f_bit; int rc = -ENOBUFS; struct sk_buff *nskb; struct llc_sock *llc = llc_sk(sk); llc_pdu_decode_pf_bit(skb, &f_bit); nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, sizeof(struct llc_frmr_info)); if (nskb) { struct llc_sap *sap = llc->sap; struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_RSP); llc_pdu_init_as_frmr_rsp(nskb, pdu, f_bit, llc->vS, llc->vR, INCORRECT); rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); if (unlikely(rc)) goto free; llc_conn_send_pdu(sk, nskb); } out: return rc; free: kfree_skb(nskb); goto out; } int llc_conn_ac_send_i_cmd_p_set_1(struct sock *sk, struct sk_buff *skb) { int rc; struct llc_sock *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, 1, llc->vS, llc->vR); rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac); if (likely(!rc)) { llc_conn_send_pdu(sk, skb); llc_conn_ac_inc_vs_by_1(sk, skb); } return rc; } static int llc_conn_ac_send_i_cmd_p_set_0(struct sock *sk, struct sk_buff *skb) { int rc; struct llc_sock *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, 0, llc->vS, llc->vR); rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac); if (likely(!rc)) { llc_conn_send_pdu(sk, skb); llc_conn_ac_inc_vs_by_1(sk, skb); } return rc; } int llc_conn_ac_send_i_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) { int rc; struct llc_sock *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, 0, llc->vS, llc->vR); rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac); if (likely(!rc)) { llc_conn_send_pdu(sk, skb); llc_conn_ac_inc_vs_by_1(sk, skb); } return 0; } int llc_conn_ac_resend_i_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) { struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); u8 nr = LLC_I_GET_NR(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 sk_buff *skb) { u8 nr; struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); int rc = -ENOBUFS; struct llc_sock *llc = llc_sk(sk); struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0); if (nskb) { struct llc_sap *sap = llc->sap; llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_RSP); llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR); rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); if (likely(!rc)) llc_conn_send_pdu(sk, nskb); else kfree_skb(skb); } if (rc) { nr = LLC_I_GET_NR(pdu); rc = 0; llc_conn_resend_i_pdu_as_cmd(sk, nr, 0); } return rc; } int llc_conn_ac_resend_i_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) { struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); u8 nr = LLC_I_GET_NR(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 sk_buff *skb) { int rc = -ENOBUFS; struct llc_sock *llc = llc_sk(sk); struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); if (nskb) { struct llc_sap *sap = llc->sap; llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_CMD); llc_pdu_init_as_rej_cmd(nskb, 1, llc->vR); rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); if (unlikely(rc)) goto free; llc_conn_send_pdu(sk, nskb); } out: return rc; free: kfree_skb(nskb); goto out; } int llc_conn_ac_send_rej_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) { int rc = -ENOBUFS; struct llc_sock *llc = llc_sk(sk); struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); if (nskb) { struct llc_sap *sap = llc->sap; llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_RSP); llc_pdu_init_as_rej_rsp(nskb, 1, llc->vR); rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); if (unlikely(rc)) goto free; llc_conn_send_pdu(sk, nskb); } out: return rc; free: kfree_skb(nskb); goto out; } int llc_conn_ac_send_rej_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) { int rc = -ENOBUFS; struct llc_sock *llc = llc_sk(sk); struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); if (nskb) { struct llc_sap *sap = llc->sap; llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_RSP); llc_pdu_init_as_rej_rsp(nskb, 0, llc->vR); rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); if (unlikely(rc)) goto free; llc_conn_send_pdu(sk, nskb); } out: return rc; free: kfree_skb(nskb); goto out; } int llc_conn_ac_send_rnr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb) { int rc = -ENOBUFS; struct llc_sock *llc = llc_sk(sk); struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); if (nskb) { struct llc_sap *sap = llc->sap; llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_CMD); llc_pdu_init_as_rnr_cmd(nskb, 1, llc->vR); rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); if (unlikely(rc)) goto free; llc_conn_send_pdu(sk, nskb); } out: return rc; free: kfree_skb(nskb); goto out; } int llc_conn_ac_send_rnr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) { int rc = -ENOBUFS; struct llc_sock *llc = llc_sk(sk); struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); if (nskb) { struct llc_sap *sap = llc->sap; llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_RSP); llc_pdu_init_as_rnr_rsp(nskb, 1, llc->vR); rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); if (unlikely(rc)) goto free; llc_conn_send_pdu(sk, nskb); } out: return rc; free: kfree_skb(nskb); goto out; } int llc_conn_ac_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) { int rc = -ENOBUFS; struct llc_sock *llc = llc_sk(sk); struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); if (nskb) { struct llc_sap *sap = llc->sap; llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_RSP); llc_pdu_init_as_rnr_rsp(nskb, 0, llc->vR); rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); if (unlikely(rc)) goto free; llc_conn_send_pdu(sk, nskb); } out: return rc; free: kfree_skb(nskb); goto out; } int llc_conn_ac_set_remote_busy(struct sock *sk, struct sk_buff *skb) { struct llc_sock *llc = llc_sk(sk); if (!llc->remote_busy_flag) { llc->remote_busy_flag = 1; mod_timer(&llc->busy_state_timer.timer, jiffies + llc->busy_state_timer.expire); } return 0; } int llc_conn_ac_opt_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) { int rc = -ENOBUFS; struct llc_sock *llc = llc_sk(sk); struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); if (nskb) { struct llc_sap *sap = llc->sap; llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_RSP); llc_pdu_init_as_rnr_rsp(nskb, 0, llc->vR); rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); if (unlikely(rc)) goto free; llc_conn_send_pdu(sk, nskb); } out: return rc; free: kfree_skb(nskb); goto out; } int llc_conn_ac_send_rr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb) { int rc = -ENOBUFS; struct llc_sock *llc = llc_sk(sk); struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); if (nskb) { struct llc_sap *sap = llc->sap; llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_CMD); llc_pdu_init_as_rr_cmd(nskb, 1, llc->vR); rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); if (unlikely(rc)) goto free; llc_conn_send_pdu(sk, nskb); } out: return rc; free: kfree_skb(nskb); goto out; } int llc_conn_ac_send_rr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) { int rc = -ENOBUFS; struct llc_sock *llc = llc_sk(sk); struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); if (nskb) { struct llc_sap *sap = llc->sap; u8 f_bit = 1; llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_RSP); llc_pdu_init_as_rr_rsp(nskb, f_bit, llc->vR); rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); if (unlikely(rc)) goto free; llc_conn_send_pdu(sk, nskb); } out: return rc; free: kfree_skb(nskb); goto out; } int llc_conn_ac_send_ack_rsp_f_set_1(struct sock *sk, struct sk_buff *skb) { int rc = -ENOBUFS; struct llc_sock *llc = llc_sk(sk); struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); if (nskb) { struct llc_sap *sap = llc->sap; llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_RSP); llc_pdu_init_as_rr_rsp(nskb, 1, llc->vR); rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); if (unlikely(rc)) goto free; llc_conn_send_pdu(sk, nskb); } out: return rc; free: kfree_skb(nskb); goto out; } int llc_conn_ac_send_rr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) { int rc = -ENOBUFS; struct llc_sock *llc = llc_sk(sk); struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); if (nskb) { struct llc_sap *sap = llc->sap; llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_RSP); llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR); rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); if (unlikely(rc)) goto free; llc_conn_send_pdu(sk, nskb); } out: return rc; free: kfree_skb(nskb); goto out; } int llc_conn_ac_send_ack_xxx_x_set_0(struct sock *sk, struct sk_buff *skb) { int rc = -ENOBUFS; struct llc_sock *llc = llc_sk(sk); struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); if (nskb) { struct llc_sap *sap = llc->sap; llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_RSP); llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR); rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); if (unlikely(rc)) goto free; llc_conn_send_pdu(sk, nskb); } out: return rc; free: kfree_skb(nskb); goto out; } void llc_conn_set_p_flag(struct sock *sk, u8 value) { int state_changed = llc_sk(sk)->p_flag && !value; llc_sk(sk)->p_flag = value; if (state_changed) sk->sk_state_change(sk); } int llc_conn_ac_send_sabme_cmd_p_set_x(struct sock *sk, struct sk_buff *skb) { int rc = -ENOBUFS; struct llc_sock *llc = llc_sk(sk); struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0); if (nskb) { struct llc_sap *sap = llc->sap; u8 *dmac = llc->daddr.mac; if (llc->dev->flags & IFF_LOOPBACK) dmac = llc->dev->dev_addr; llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_CMD); llc_pdu_init_as_sabme_cmd(nskb, 1); rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, dmac); if (unlikely(rc)) goto free; llc_conn_send_pdu(sk, nskb); llc_conn_set_p_flag(sk, 1); } out: return rc; free: kfree_skb(nskb); goto out; } int llc_conn_ac_send_ua_rsp_f_set_p(struct sock *sk, struct sk_buff *skb) { u8 f_bit; int rc = -ENOBUFS; struct llc_sock *llc = llc_sk(sk); struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_U, 0); llc_pdu_decode_pf_bit(skb, &f_bit); if (nskb) { struct llc_sap *sap = llc->sap; nskb->dev = llc->dev; llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_RSP); llc_pdu_init_as_ua_rsp(nskb, f_bit); rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); if (unlikely(rc)) goto free; llc_conn_send_pdu(sk, nskb); } out: return rc; free: kfree_skb(nskb); goto out; } int llc_conn_ac_set_s_flag_0(struct sock *sk, struct sk_buff *skb) { llc_sk(sk)->s_flag = 0; return 0; } int llc_conn_ac_set_s_flag_1(struct sock *sk, struct sk_buff *skb) { llc_sk(sk)->s_flag = 1; return 0; } int llc_conn_ac_start_p_timer(struct sock *sk, struct sk_buff *skb) { struct llc_sock *llc = llc_sk(sk); llc_conn_set_p_flag(sk, 1); mod_timer(&llc->pf_cycle_timer.timer, jiffies + llc->pf_cycle_timer.expire); return 0; } /** * llc_conn_ac_send_ack_if_needed - check if ack is needed * @sk: current connection structure * @skb: 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 sk_buff *skb) { u8 pf_bit; struct llc_sock *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 + 1 + LLC_2_SEQ_NBR_MODULO) % LLC_2_SEQ_NBR_MODULO) >= llc->npta) { llc_conn_ac_send_rr_rsp_f_set_ackpf(sk, skb); llc->ack_must_be_send = 0; llc->ack_pf = 0; llc_conn_ac_inc_npta_value(sk, skb); } return 0; } /** * llc_conn_ac_rst_sendack_flag - resets ack_must_be_send flag * @sk: current connection structure * @skb: 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 sk_buff *skb) { 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 * @skb: 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. */ static int llc_conn_ac_send_i_rsp_f_set_ackpf(struct sock *sk, struct sk_buff *skb) { int rc; struct llc_sock *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_RSP); llc_pdu_init_as_i_cmd(skb, llc->ack_pf, llc->vS, llc->vR); rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac); if (likely(!rc)) { llc_conn_send_pdu(sk, skb); llc_conn_ac_inc_vs_by_1(sk, skb); } return rc; } /** * llc_conn_ac_send_i_as_ack - sends an I-format PDU to acknowledge rx PDUs * @sk: current connection structure. * @skb: 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 sk_buff *skb) { struct llc_sock *llc = llc_sk(sk); if (llc->ack_must_be_send) { llc_conn_ac_send_i_rsp_f_set_ackpf(sk, skb); llc->ack_must_be_send = 0 ; llc->ack_pf = 0; } else llc_conn_ac_send_i_cmd_p_set_0(sk, skb); return 0; } /** * llc_conn_ac_send_rr_rsp_f_set_ackpf - ack all rx PDUs not yet acked * @sk: current connection structure. * @skb: 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. */ static int llc_conn_ac_send_rr_rsp_f_set_ackpf(struct sock *sk, struct sk_buff *skb) { int rc = -ENOBUFS; struct llc_sock *llc = llc_sk(sk); struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev, LLC_PDU_TYPE_S, 0); if (nskb) { struct llc_sap *sap = llc->sap; llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap, llc->daddr.lsap, LLC_PDU_RSP); llc_pdu_init_as_rr_rsp(nskb, llc->ack_pf, llc->vR); rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac); if (unlikely(rc)) goto free; llc_conn_send_pdu(sk, nskb); } out: return rc; free: kfree_skb(nskb); goto out; } /** * llc_conn_ac_inc_npta_value - tries to make value of npta greater * @sk: current connection structure. * @skb: 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. */ static int llc_conn_ac_inc_npta_value(struct sock *sk, struct sk_buff *skb) { struct llc_sock *llc = llc_sk(sk); if (!llc->inc_cntr) { llc->dec_step = 0; llc->dec_cntr = llc->inc_cntr = 2; ++llc->npta; if (llc->npta > (u8) ~LLC_2_SEQ_NBR_MODULO) llc->npta = (u8) ~LLC_2_SEQ_NBR_MODULO; } else --llc->inc_cntr; return 0; } /** * llc_conn_ac_adjust_npta_by_rr - decreases "npta" by one * @sk: current connection structure. * @skb: 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 sk_buff *skb) { struct llc_sock *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. * @skb: 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 sk_buff *skb) { struct llc_sock *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. * @skb: 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 sk_buff *skb) { struct llc_sock *llc = llc_sk(sk); u8 unacked_pdu = skb_queue_len(&llc->pdu_unack_q); if (llc->k - unacked_pdu < 1) llc->k = 1; else llc->k -= unacked_pdu; return 0; } /** * llc_conn_ac_inc_tx_win_size - tx window size is inc by 1 * @sk: current connection structure. * @skb: 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 sk_buff *skb) { struct llc_sock *llc = llc_sk(sk); llc->k += 1; if (llc->k > (u8) ~LLC_2_SEQ_NBR_MODULO) llc->k = (u8) ~LLC_2_SEQ_NBR_MODULO; return 0; } int llc_conn_ac_stop_all_timers(struct sock *sk, struct sk_buff *skb) { struct llc_sock *llc = llc_sk(sk); del_timer(&llc->pf_cycle_timer.timer); del_timer(&llc->ack_timer.timer); del_timer(&llc->rej_sent_timer.timer); del_timer(&llc->busy_state_timer.timer); llc->ack_must_be_send = 0; llc->ack_pf = 0; return 0; } int llc_conn_ac_stop_other_timers(struct sock *sk, struct sk_buff *skb) { struct llc_sock *llc = llc_sk(sk); del_timer(&llc->rej_sent_timer.timer); del_timer(&llc->pf_cycle_timer.timer); del_timer(&llc->busy_state_timer.timer); llc->ack_must_be_send = 0; llc->ack_pf = 0; return 0; } int llc_conn_ac_start_ack_timer(struct sock *sk, struct sk_buff *skb) { struct llc_sock *llc = llc_sk(sk); mod_timer(&llc->ack_timer.timer, jiffies + llc->ack_timer.expire); return 0; } int llc_conn_ac_start_rej_timer(struct sock *sk, struct sk_buff *skb) { struct llc_sock *llc = llc_sk(sk); mod_timer(&llc->rej_sent_timer.timer, jiffies + llc->rej_sent_timer.expire); return 0; } int llc_conn_ac_start_ack_tmr_if_not_running(struct sock *sk, struct sk_buff *skb) { struct llc_sock *llc = llc_sk(sk); if (!timer_pending(&llc->ack_timer.timer)) mod_timer(&llc->ack_timer.timer, jiffies + llc->ack_timer.expire); return 0; } int llc_conn_ac_stop_ack_timer(struct sock *sk, struct sk_buff *skb) { del_timer(&llc_sk(sk)->ack_timer.timer); return 0; } int llc_conn_ac_stop_p_timer(struct sock *sk, struct sk_buff *skb) { struct llc_sock *llc = llc_sk(sk); del_timer(&llc->pf_cycle_timer.timer); llc_conn_set_p_flag(sk, 0); return 0; } int llc_conn_ac_stop_rej_timer(struct sock *sk, struct sk_buff *skb) { del_timer(&llc_sk(sk)->rej_sent_timer.timer); return 0; } int llc_conn_ac_upd_nr_received(struct sock *sk, struct sk_buff *skb) { int acked; u16 unacked = 0; struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); struct llc_sock *llc = llc_sk(sk); llc->last_nr = PDU_SUPV_GET_Nr(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); 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, skb); } if (unacked) mod_timer(&llc->ack_timer.timer, jiffies + llc->ack_timer.expire); } else if (llc->failed_data_req) { u8 f_bit; llc_pdu_decode_pf_bit(skb, &f_bit); if (f_bit == 1) { llc->failed_data_req = 0; llc_conn_ac_data_confirm(sk, skb); } } return 0; } int llc_conn_ac_upd_p_flag(struct sock *sk, struct sk_buff *skb) { struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); if (LLC_PDU_IS_RSP(pdu)) { u8 f_bit; llc_pdu_decode_pf_bit(skb, &f_bit); if (f_bit) { llc_conn_set_p_flag(sk, 0); llc_conn_ac_stop_p_timer(sk, skb); } } return 0; } int llc_conn_ac_set_data_flag_2(struct sock *sk, struct sk_buff *skb) { llc_sk(sk)->data_flag = 2; return 0; } int llc_conn_ac_set_data_flag_0(struct sock *sk, struct sk_buff *skb) { llc_sk(sk)->data_flag = 0; return 0; } int llc_conn_ac_set_data_flag_1(struct sock *sk, struct sk_buff *skb) { 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 sk_buff *skb) { 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 sk_buff *skb) { llc_conn_set_p_flag(sk, 0); return 0; } static int llc_conn_ac_set_p_flag_1(struct sock *sk, struct sk_buff *skb) { llc_conn_set_p_flag(sk, 1); return 0; } int llc_conn_ac_set_remote_busy_0(struct sock *sk, struct sk_buff *skb) { llc_sk(sk)->remote_busy_flag = 0; return 0; } int llc_conn_ac_set_cause_flag_0(struct sock *sk, struct sk_buff *skb) { llc_sk(sk)->cause_flag = 0; return 0; } int llc_conn_ac_set_cause_flag_1(struct sock *sk, struct sk_buff *skb) { llc_sk(sk)->cause_flag = 1; return 0; } int llc_conn_ac_set_retry_cnt_0(struct sock *sk, struct sk_buff *skb) { llc_sk(sk)->retry_count = 0; return 0; } int llc_conn_ac_inc_retry_cnt_by_1(struct sock *sk, struct sk_buff *skb) { llc_sk(sk)->retry_count++; return 0; } int llc_conn_ac_set_vr_0(struct sock *sk, struct sk_buff *skb) { llc_sk(sk)->vR = 0; return 0; } int llc_conn_ac_inc_vr_by_1(struct sock *sk, struct sk_buff *skb) { 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 sk_buff *skb) { llc_sk(sk)->vS = 0; return 0; } int llc_conn_ac_set_vs_nr(struct sock *sk, struct sk_buff *skb) { llc_sk(sk)->vS = llc_sk(sk)->last_nr; return 0; } static int llc_conn_ac_inc_vs_by_1(struct sock *sk, struct sk_buff *skb) { llc_sk(sk)->vS = (llc_sk(sk)->vS + 1) % LLC_2_SEQ_NBR_MODULO; return 0; } static void llc_conn_tmr_common_cb(unsigned long timeout_data, u8 type) { struct sock *sk = (struct sock *)timeout_data; struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC); bh_lock_sock(sk); if (skb) { struct llc_conn_state_ev *ev = llc_conn_ev(skb); skb_set_owner_r(skb, sk); ev->type = type; llc_process_tmr_ev(sk, skb); } bh_unlock_sock(sk); } void llc_conn_pf_cycle_tmr_cb(unsigned long timeout_data) { llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_P_TMR); } void llc_conn_busy_tmr_cb(unsigned long timeout_data) { llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_BUSY_TMR); } void llc_conn_ack_tmr_cb(unsigned long timeout_data) { llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_ACK_TMR); } void llc_conn_rej_tmr_cb(unsigned long timeout_data) { llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_REJ_TMR); } int llc_conn_ac_rst_vs(struct sock *sk, struct sk_buff *skb) { llc_sk(sk)->X = llc_sk(sk)->vS; llc_conn_ac_set_vs_nr(sk, skb); return 0; } int llc_conn_ac_upd_vs(struct sock *sk, struct sk_buff *skb) { struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb); u8 nr = PDU_SUPV_GET_Nr(pdu); if (llc_circular_between(llc_sk(sk)->vS, nr, llc_sk(sk)->X)) llc_conn_ac_set_vs_nr(sk, skb); 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 * @skb: occurred event */ int llc_conn_disc(struct sock *sk, struct sk_buff *skb) { /* FIXME: this thing seems to want to die */ return 0; } /** * llc_conn_reset - resets connection * @sk : reseting connection. * @skb: occurred event. * * Stop all timers, empty all queues and reset all flags. */ int llc_conn_reset(struct sock *sk, struct sk_buff *skb) { llc_sk_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 * @skb: 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 llc_backlog_rcv function after sending * data frame. */ static void llc_process_tmr_ev(struct sock *sk, struct sk_buff *skb) { if (llc_sk(sk)->state == LLC_CONN_OUT_OF_SVC) { printk(KERN_WARNING "%s: timer called on closed connection\n", __func__); kfree_skb(skb); } else { if (!sock_owned_by_user(sk)) llc_conn_state_process(sk, skb); else { llc_set_backlog_type(skb, LLC_EVENT); __sk_add_backlog(sk, skb); } } }