| /********************************************************************* |
| * |
| * Filename: irlap_frame.c |
| * Version: 1.0 |
| * Description: Build and transmit IrLAP frames |
| * Status: Stable |
| * Author: Dag Brattli <dagb@cs.uit.no> |
| * Created at: Tue Aug 19 10:27:26 1997 |
| * Modified at: Wed Jan 5 08:59:04 2000 |
| * Modified by: Dag Brattli <dagb@cs.uit.no> |
| * |
| * Copyright (c) 1998-2000 Dag Brattli <dagb@cs.uit.no>, |
| * All Rights Reserved. |
| * Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com> |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation; either version 2 of |
| * the License, or (at your option) any later version. |
| * |
| * Neither Dag Brattli nor University of Tromsø admit liability nor |
| * provide warranty for any of this software. This material is |
| * provided "AS-IS" and at no charge. |
| * |
| ********************************************************************/ |
| |
| #include <linux/skbuff.h> |
| #include <linux/if.h> |
| #include <linux/if_ether.h> |
| #include <linux/netdevice.h> |
| #include <linux/irda.h> |
| |
| #include <net/pkt_sched.h> |
| #include <net/sock.h> |
| |
| #include <asm/byteorder.h> |
| |
| #include <net/irda/irda.h> |
| #include <net/irda/irda_device.h> |
| #include <net/irda/irlap.h> |
| #include <net/irda/wrapper.h> |
| #include <net/irda/timer.h> |
| #include <net/irda/irlap_frame.h> |
| #include <net/irda/qos.h> |
| |
| static void irlap_send_i_frame(struct irlap_cb *self, struct sk_buff *skb, |
| int command); |
| |
| /* |
| * Function irlap_insert_info (self, skb) |
| * |
| * Insert minimum turnaround time and speed information into the skb. We |
| * need to do this since it's per packet relevant information. Safe to |
| * have this function inlined since it's only called from one place |
| */ |
| static inline void irlap_insert_info(struct irlap_cb *self, |
| struct sk_buff *skb) |
| { |
| struct irda_skb_cb *cb = (struct irda_skb_cb *) skb->cb; |
| |
| /* |
| * Insert MTT (min. turn time) and speed into skb, so that the |
| * device driver knows which settings to use |
| */ |
| cb->magic = LAP_MAGIC; |
| cb->mtt = self->mtt_required; |
| cb->next_speed = self->speed; |
| |
| /* Reset */ |
| self->mtt_required = 0; |
| |
| /* |
| * Delay equals negotiated BOFs count, plus the number of BOFs to |
| * force the negotiated minimum turnaround time |
| */ |
| cb->xbofs = self->bofs_count; |
| cb->next_xbofs = self->next_bofs; |
| cb->xbofs_delay = self->xbofs_delay; |
| |
| /* Reset XBOF's delay (used only for getting min turn time) */ |
| self->xbofs_delay = 0; |
| /* Put the correct xbofs value for the next packet */ |
| self->bofs_count = self->next_bofs; |
| } |
| |
| /* |
| * Function irlap_queue_xmit (self, skb) |
| * |
| * A little wrapper for dev_queue_xmit, so we can insert some common |
| * code into it. |
| */ |
| void irlap_queue_xmit(struct irlap_cb *self, struct sk_buff *skb) |
| { |
| /* Some common init stuff */ |
| skb->dev = self->netdev; |
| skb_reset_mac_header(skb); |
| skb->h.raw = skb->nh.raw = skb->data; |
| skb->protocol = htons(ETH_P_IRDA); |
| skb->priority = TC_PRIO_BESTEFFORT; |
| |
| irlap_insert_info(self, skb); |
| |
| dev_queue_xmit(skb); |
| } |
| |
| /* |
| * Function irlap_send_snrm_cmd (void) |
| * |
| * Transmits a connect SNRM command frame |
| */ |
| void irlap_send_snrm_frame(struct irlap_cb *self, struct qos_info *qos) |
| { |
| struct sk_buff *tx_skb; |
| struct snrm_frame *frame; |
| int ret; |
| |
| IRDA_ASSERT(self != NULL, return;); |
| IRDA_ASSERT(self->magic == LAP_MAGIC, return;); |
| |
| /* Allocate frame */ |
| tx_skb = alloc_skb(sizeof(struct snrm_frame) + |
| IRLAP_NEGOCIATION_PARAMS_LEN, |
| GFP_ATOMIC); |
| if (!tx_skb) |
| return; |
| |
| frame = (struct snrm_frame *) skb_put(tx_skb, 2); |
| |
| /* Insert connection address field */ |
| if (qos) |
| frame->caddr = CMD_FRAME | CBROADCAST; |
| else |
| frame->caddr = CMD_FRAME | self->caddr; |
| |
| /* Insert control field */ |
| frame->control = SNRM_CMD | PF_BIT; |
| |
| /* |
| * If we are establishing a connection then insert QoS paramerters |
| */ |
| if (qos) { |
| skb_put(tx_skb, 9); /* 25 left */ |
| frame->saddr = cpu_to_le32(self->saddr); |
| frame->daddr = cpu_to_le32(self->daddr); |
| |
| frame->ncaddr = self->caddr; |
| |
| ret = irlap_insert_qos_negotiation_params(self, tx_skb); |
| if (ret < 0) { |
| dev_kfree_skb(tx_skb); |
| return; |
| } |
| } |
| irlap_queue_xmit(self, tx_skb); |
| } |
| |
| /* |
| * Function irlap_recv_snrm_cmd (skb, info) |
| * |
| * Received SNRM (Set Normal Response Mode) command frame |
| * |
| */ |
| static void irlap_recv_snrm_cmd(struct irlap_cb *self, struct sk_buff *skb, |
| struct irlap_info *info) |
| { |
| struct snrm_frame *frame; |
| |
| if (pskb_may_pull(skb,sizeof(struct snrm_frame))) { |
| frame = (struct snrm_frame *) skb->data; |
| |
| /* Copy the new connection address ignoring the C/R bit */ |
| info->caddr = frame->ncaddr & 0xFE; |
| |
| /* Check if the new connection address is valid */ |
| if ((info->caddr == 0x00) || (info->caddr == 0xfe)) { |
| IRDA_DEBUG(3, "%s(), invalid connection address!\n", |
| __FUNCTION__); |
| return; |
| } |
| |
| /* Copy peer device address */ |
| info->daddr = le32_to_cpu(frame->saddr); |
| info->saddr = le32_to_cpu(frame->daddr); |
| |
| /* Only accept if addressed directly to us */ |
| if (info->saddr != self->saddr) { |
| IRDA_DEBUG(2, "%s(), not addressed to us!\n", |
| __FUNCTION__); |
| return; |
| } |
| irlap_do_event(self, RECV_SNRM_CMD, skb, info); |
| } else { |
| /* Signal that this SNRM frame does not contain and I-field */ |
| irlap_do_event(self, RECV_SNRM_CMD, skb, NULL); |
| } |
| } |
| |
| /* |
| * Function irlap_send_ua_response_frame (qos) |
| * |
| * Send UA (Unnumbered Acknowledgement) frame |
| * |
| */ |
| void irlap_send_ua_response_frame(struct irlap_cb *self, struct qos_info *qos) |
| { |
| struct sk_buff *tx_skb; |
| struct ua_frame *frame; |
| int ret; |
| |
| IRDA_DEBUG(2, "%s() <%ld>\n", __FUNCTION__, jiffies); |
| |
| IRDA_ASSERT(self != NULL, return;); |
| IRDA_ASSERT(self->magic == LAP_MAGIC, return;); |
| |
| /* Allocate frame */ |
| tx_skb = alloc_skb(sizeof(struct ua_frame) + |
| IRLAP_NEGOCIATION_PARAMS_LEN, |
| GFP_ATOMIC); |
| if (!tx_skb) |
| return; |
| |
| frame = (struct ua_frame *) skb_put(tx_skb, 10); |
| |
| /* Build UA response */ |
| frame->caddr = self->caddr; |
| frame->control = UA_RSP | PF_BIT; |
| |
| frame->saddr = cpu_to_le32(self->saddr); |
| frame->daddr = cpu_to_le32(self->daddr); |
| |
| /* Should we send QoS negotiation parameters? */ |
| if (qos) { |
| ret = irlap_insert_qos_negotiation_params(self, tx_skb); |
| if (ret < 0) { |
| dev_kfree_skb(tx_skb); |
| return; |
| } |
| } |
| |
| irlap_queue_xmit(self, tx_skb); |
| } |
| |
| |
| /* |
| * Function irlap_send_dm_frame (void) |
| * |
| * Send disconnected mode (DM) frame |
| * |
| */ |
| void irlap_send_dm_frame( struct irlap_cb *self) |
| { |
| struct sk_buff *tx_skb = NULL; |
| struct dm_frame *frame; |
| |
| IRDA_ASSERT(self != NULL, return;); |
| IRDA_ASSERT(self->magic == LAP_MAGIC, return;); |
| |
| tx_skb = alloc_skb(sizeof(struct dm_frame), GFP_ATOMIC); |
| if (!tx_skb) |
| return; |
| |
| frame = (struct dm_frame *)skb_put(tx_skb, 2); |
| |
| if (self->state == LAP_NDM) |
| frame->caddr = CBROADCAST; |
| else |
| frame->caddr = self->caddr; |
| |
| frame->control = DM_RSP | PF_BIT; |
| |
| irlap_queue_xmit(self, tx_skb); |
| } |
| |
| /* |
| * Function irlap_send_disc_frame (void) |
| * |
| * Send disconnect (DISC) frame |
| * |
| */ |
| void irlap_send_disc_frame(struct irlap_cb *self) |
| { |
| struct sk_buff *tx_skb = NULL; |
| struct disc_frame *frame; |
| |
| IRDA_DEBUG(3, "%s()\n", __FUNCTION__); |
| |
| IRDA_ASSERT(self != NULL, return;); |
| IRDA_ASSERT(self->magic == LAP_MAGIC, return;); |
| |
| tx_skb = alloc_skb(sizeof(struct disc_frame), GFP_ATOMIC); |
| if (!tx_skb) |
| return; |
| |
| frame = (struct disc_frame *)skb_put(tx_skb, 2); |
| |
| frame->caddr = self->caddr | CMD_FRAME; |
| frame->control = DISC_CMD | PF_BIT; |
| |
| irlap_queue_xmit(self, tx_skb); |
| } |
| |
| /* |
| * Function irlap_send_discovery_xid_frame (S, s, command) |
| * |
| * Build and transmit a XID (eXchange station IDentifier) discovery |
| * frame. |
| */ |
| void irlap_send_discovery_xid_frame(struct irlap_cb *self, int S, __u8 s, |
| __u8 command, discovery_t *discovery) |
| { |
| struct sk_buff *tx_skb = NULL; |
| struct xid_frame *frame; |
| __u32 bcast = BROADCAST; |
| __u8 *info; |
| |
| IRDA_DEBUG(4, "%s(), s=%d, S=%d, command=%d\n", __FUNCTION__, |
| s, S, command); |
| |
| IRDA_ASSERT(self != NULL, return;); |
| IRDA_ASSERT(self->magic == LAP_MAGIC, return;); |
| IRDA_ASSERT(discovery != NULL, return;); |
| |
| tx_skb = alloc_skb(sizeof(struct xid_frame) + IRLAP_DISCOVERY_INFO_LEN, |
| GFP_ATOMIC); |
| if (!tx_skb) |
| return; |
| |
| skb_put(tx_skb, 14); |
| frame = (struct xid_frame *) tx_skb->data; |
| |
| if (command) { |
| frame->caddr = CBROADCAST | CMD_FRAME; |
| frame->control = XID_CMD | PF_BIT; |
| } else { |
| frame->caddr = CBROADCAST; |
| frame->control = XID_RSP | PF_BIT; |
| } |
| frame->ident = XID_FORMAT; |
| |
| frame->saddr = cpu_to_le32(self->saddr); |
| |
| if (command) |
| frame->daddr = cpu_to_le32(bcast); |
| else |
| frame->daddr = cpu_to_le32(discovery->data.daddr); |
| |
| switch (S) { |
| case 1: |
| frame->flags = 0x00; |
| break; |
| case 6: |
| frame->flags = 0x01; |
| break; |
| case 8: |
| frame->flags = 0x02; |
| break; |
| case 16: |
| frame->flags = 0x03; |
| break; |
| default: |
| frame->flags = 0x02; |
| break; |
| } |
| |
| frame->slotnr = s; |
| frame->version = 0x00; |
| |
| /* |
| * Provide info for final slot only in commands, and for all |
| * responses. Send the second byte of the hint only if the |
| * EXTENSION bit is set in the first byte. |
| */ |
| if (!command || (frame->slotnr == 0xff)) { |
| int len; |
| |
| if (discovery->data.hints[0] & HINT_EXTENSION) { |
| info = skb_put(tx_skb, 2); |
| info[0] = discovery->data.hints[0]; |
| info[1] = discovery->data.hints[1]; |
| } else { |
| info = skb_put(tx_skb, 1); |
| info[0] = discovery->data.hints[0]; |
| } |
| info = skb_put(tx_skb, 1); |
| info[0] = discovery->data.charset; |
| |
| len = IRDA_MIN(discovery->name_len, skb_tailroom(tx_skb)); |
| info = skb_put(tx_skb, len); |
| memcpy(info, discovery->data.info, len); |
| } |
| irlap_queue_xmit(self, tx_skb); |
| } |
| |
| /* |
| * Function irlap_recv_discovery_xid_rsp (skb, info) |
| * |
| * Received a XID discovery response |
| * |
| */ |
| static void irlap_recv_discovery_xid_rsp(struct irlap_cb *self, |
| struct sk_buff *skb, |
| struct irlap_info *info) |
| { |
| struct xid_frame *xid; |
| discovery_t *discovery = NULL; |
| __u8 *discovery_info; |
| char *text; |
| |
| IRDA_DEBUG(4, "%s()\n", __FUNCTION__); |
| |
| IRDA_ASSERT(self != NULL, return;); |
| IRDA_ASSERT(self->magic == LAP_MAGIC, return;); |
| |
| if (!pskb_may_pull(skb, sizeof(struct xid_frame))) { |
| IRDA_ERROR("%s: frame to short!\n", __FUNCTION__); |
| return; |
| } |
| |
| xid = (struct xid_frame *) skb->data; |
| |
| info->daddr = le32_to_cpu(xid->saddr); |
| info->saddr = le32_to_cpu(xid->daddr); |
| |
| /* Make sure frame is addressed to us */ |
| if ((info->saddr != self->saddr) && (info->saddr != BROADCAST)) { |
| IRDA_DEBUG(0, "%s(), frame is not addressed to us!\n", |
| __FUNCTION__); |
| return; |
| } |
| |
| if ((discovery = kzalloc(sizeof(discovery_t), GFP_ATOMIC)) == NULL) { |
| IRDA_WARNING("%s: kmalloc failed!\n", __FUNCTION__); |
| return; |
| } |
| |
| discovery->data.daddr = info->daddr; |
| discovery->data.saddr = self->saddr; |
| discovery->timestamp = jiffies; |
| |
| IRDA_DEBUG(4, "%s(), daddr=%08x\n", __FUNCTION__, |
| discovery->data.daddr); |
| |
| discovery_info = skb_pull(skb, sizeof(struct xid_frame)); |
| |
| /* Get info returned from peer */ |
| discovery->data.hints[0] = discovery_info[0]; |
| if (discovery_info[0] & HINT_EXTENSION) { |
| IRDA_DEBUG(4, "EXTENSION\n"); |
| discovery->data.hints[1] = discovery_info[1]; |
| discovery->data.charset = discovery_info[2]; |
| text = (char *) &discovery_info[3]; |
| } else { |
| discovery->data.hints[1] = 0; |
| discovery->data.charset = discovery_info[1]; |
| text = (char *) &discovery_info[2]; |
| } |
| /* |
| * Terminate info string, should be safe since this is where the |
| * FCS bytes resides. |
| */ |
| skb->data[skb->len] = '\0'; |
| strncpy(discovery->data.info, text, NICKNAME_MAX_LEN); |
| discovery->name_len = strlen(discovery->data.info); |
| |
| info->discovery = discovery; |
| |
| irlap_do_event(self, RECV_DISCOVERY_XID_RSP, skb, info); |
| } |
| |
| /* |
| * Function irlap_recv_discovery_xid_cmd (skb, info) |
| * |
| * Received a XID discovery command |
| * |
| */ |
| static void irlap_recv_discovery_xid_cmd(struct irlap_cb *self, |
| struct sk_buff *skb, |
| struct irlap_info *info) |
| { |
| struct xid_frame *xid; |
| discovery_t *discovery = NULL; |
| __u8 *discovery_info; |
| char *text; |
| |
| if (!pskb_may_pull(skb, sizeof(struct xid_frame))) { |
| IRDA_ERROR("%s: frame to short!\n", __FUNCTION__); |
| return; |
| } |
| |
| xid = (struct xid_frame *) skb->data; |
| |
| info->daddr = le32_to_cpu(xid->saddr); |
| info->saddr = le32_to_cpu(xid->daddr); |
| |
| /* Make sure frame is addressed to us */ |
| if ((info->saddr != self->saddr) && (info->saddr != BROADCAST)) { |
| IRDA_DEBUG(0, "%s(), frame is not addressed to us!\n", |
| __FUNCTION__); |
| return; |
| } |
| |
| switch (xid->flags & 0x03) { |
| case 0x00: |
| info->S = 1; |
| break; |
| case 0x01: |
| info->S = 6; |
| break; |
| case 0x02: |
| info->S = 8; |
| break; |
| case 0x03: |
| info->S = 16; |
| break; |
| default: |
| /* Error!! */ |
| return; |
| } |
| info->s = xid->slotnr; |
| |
| discovery_info = skb_pull(skb, sizeof(struct xid_frame)); |
| |
| /* |
| * Check if last frame |
| */ |
| if (info->s == 0xff) { |
| /* Check if things are sane at this point... */ |
| if((discovery_info == NULL) || |
| !pskb_may_pull(skb, 3)) { |
| IRDA_ERROR("%s: discovery frame to short!\n", |
| __FUNCTION__); |
| return; |
| } |
| |
| /* |
| * We now have some discovery info to deliver! |
| */ |
| discovery = kmalloc(sizeof(discovery_t), GFP_ATOMIC); |
| if (!discovery) { |
| IRDA_WARNING("%s: unable to malloc!\n", __FUNCTION__); |
| return; |
| } |
| |
| discovery->data.daddr = info->daddr; |
| discovery->data.saddr = self->saddr; |
| discovery->timestamp = jiffies; |
| |
| discovery->data.hints[0] = discovery_info[0]; |
| if (discovery_info[0] & HINT_EXTENSION) { |
| discovery->data.hints[1] = discovery_info[1]; |
| discovery->data.charset = discovery_info[2]; |
| text = (char *) &discovery_info[3]; |
| } else { |
| discovery->data.hints[1] = 0; |
| discovery->data.charset = discovery_info[1]; |
| text = (char *) &discovery_info[2]; |
| } |
| /* |
| * Terminate string, should be safe since this is where the |
| * FCS bytes resides. |
| */ |
| skb->data[skb->len] = '\0'; |
| strncpy(discovery->data.info, text, NICKNAME_MAX_LEN); |
| discovery->name_len = strlen(discovery->data.info); |
| |
| info->discovery = discovery; |
| } else |
| info->discovery = NULL; |
| |
| irlap_do_event(self, RECV_DISCOVERY_XID_CMD, skb, info); |
| } |
| |
| /* |
| * Function irlap_send_rr_frame (self, command) |
| * |
| * Build and transmit RR (Receive Ready) frame. Notice that it is currently |
| * only possible to send RR frames with the poll bit set. |
| */ |
| void irlap_send_rr_frame(struct irlap_cb *self, int command) |
| { |
| struct sk_buff *tx_skb; |
| struct rr_frame *frame; |
| |
| tx_skb = alloc_skb(sizeof(struct rr_frame), GFP_ATOMIC); |
| if (!tx_skb) |
| return; |
| |
| frame = (struct rr_frame *)skb_put(tx_skb, 2); |
| |
| frame->caddr = self->caddr; |
| frame->caddr |= (command) ? CMD_FRAME : 0; |
| |
| frame->control = RR | PF_BIT | (self->vr << 5); |
| |
| irlap_queue_xmit(self, tx_skb); |
| } |
| |
| /* |
| * Function irlap_send_rd_frame (self) |
| * |
| * Request disconnect. Used by a secondary station to request the |
| * disconnection of the link. |
| */ |
| void irlap_send_rd_frame(struct irlap_cb *self) |
| { |
| struct sk_buff *tx_skb; |
| struct rd_frame *frame; |
| |
| tx_skb = alloc_skb(sizeof(struct rd_frame), GFP_ATOMIC); |
| if (!tx_skb) |
| return; |
| |
| frame = (struct rd_frame *)skb_put(tx_skb, 2); |
| |
| frame->caddr = self->caddr; |
| frame->caddr = RD_RSP | PF_BIT; |
| |
| irlap_queue_xmit(self, tx_skb); |
| } |
| |
| /* |
| * Function irlap_recv_rr_frame (skb, info) |
| * |
| * Received RR (Receive Ready) frame from peer station, no harm in |
| * making it inline since its called only from one single place |
| * (irlap_driver_rcv). |
| */ |
| static inline void irlap_recv_rr_frame(struct irlap_cb *self, |
| struct sk_buff *skb, |
| struct irlap_info *info, int command) |
| { |
| info->nr = skb->data[1] >> 5; |
| |
| /* Check if this is a command or a response frame */ |
| if (command) |
| irlap_do_event(self, RECV_RR_CMD, skb, info); |
| else |
| irlap_do_event(self, RECV_RR_RSP, skb, info); |
| } |
| |
| /* |
| * Function irlap_recv_rnr_frame (self, skb, info) |
| * |
| * Received RNR (Receive Not Ready) frame from peer station |
| * |
| */ |
| static void irlap_recv_rnr_frame(struct irlap_cb *self, struct sk_buff *skb, |
| struct irlap_info *info, int command) |
| { |
| info->nr = skb->data[1] >> 5; |
| |
| IRDA_DEBUG(4, "%s(), nr=%d, %ld\n", __FUNCTION__, info->nr, jiffies); |
| |
| if (command) |
| irlap_do_event(self, RECV_RNR_CMD, skb, info); |
| else |
| irlap_do_event(self, RECV_RNR_RSP, skb, info); |
| } |
| |
| static void irlap_recv_rej_frame(struct irlap_cb *self, struct sk_buff *skb, |
| struct irlap_info *info, int command) |
| { |
| IRDA_DEBUG(0, "%s()\n", __FUNCTION__); |
| |
| info->nr = skb->data[1] >> 5; |
| |
| /* Check if this is a command or a response frame */ |
| if (command) |
| irlap_do_event(self, RECV_REJ_CMD, skb, info); |
| else |
| irlap_do_event(self, RECV_REJ_RSP, skb, info); |
| } |
| |
| static void irlap_recv_srej_frame(struct irlap_cb *self, struct sk_buff *skb, |
| struct irlap_info *info, int command) |
| { |
| IRDA_DEBUG(0, "%s()\n", __FUNCTION__); |
| |
| info->nr = skb->data[1] >> 5; |
| |
| /* Check if this is a command or a response frame */ |
| if (command) |
| irlap_do_event(self, RECV_SREJ_CMD, skb, info); |
| else |
| irlap_do_event(self, RECV_SREJ_RSP, skb, info); |
| } |
| |
| static void irlap_recv_disc_frame(struct irlap_cb *self, struct sk_buff *skb, |
| struct irlap_info *info, int command) |
| { |
| IRDA_DEBUG(2, "%s()\n", __FUNCTION__); |
| |
| /* Check if this is a command or a response frame */ |
| if (command) |
| irlap_do_event(self, RECV_DISC_CMD, skb, info); |
| else |
| irlap_do_event(self, RECV_RD_RSP, skb, info); |
| } |
| |
| /* |
| * Function irlap_recv_ua_frame (skb, frame) |
| * |
| * Received UA (Unnumbered Acknowledgement) frame |
| * |
| */ |
| static inline void irlap_recv_ua_frame(struct irlap_cb *self, |
| struct sk_buff *skb, |
| struct irlap_info *info) |
| { |
| irlap_do_event(self, RECV_UA_RSP, skb, info); |
| } |
| |
| /* |
| * Function irlap_send_data_primary(self, skb) |
| * |
| * Send I-frames as the primary station but without the poll bit set |
| * |
| */ |
| void irlap_send_data_primary(struct irlap_cb *self, struct sk_buff *skb) |
| { |
| struct sk_buff *tx_skb; |
| |
| if (skb->data[1] == I_FRAME) { |
| |
| /* |
| * Insert frame sequence number (Vs) in control field before |
| * inserting into transmit window queue. |
| */ |
| skb->data[1] = I_FRAME | (self->vs << 1); |
| |
| /* |
| * Insert frame in store, in case of retransmissions |
| * Increase skb reference count, see irlap_do_event() |
| */ |
| skb_get(skb); |
| skb_queue_tail(&self->wx_list, skb); |
| |
| /* Copy buffer */ |
| tx_skb = skb_clone(skb, GFP_ATOMIC); |
| if (tx_skb == NULL) { |
| return; |
| } |
| |
| self->vs = (self->vs + 1) % 8; |
| self->ack_required = FALSE; |
| self->window -= 1; |
| |
| irlap_send_i_frame( self, tx_skb, CMD_FRAME); |
| } else { |
| IRDA_DEBUG(4, "%s(), sending unreliable frame\n", __FUNCTION__); |
| irlap_send_ui_frame(self, skb_get(skb), self->caddr, CMD_FRAME); |
| self->window -= 1; |
| } |
| } |
| /* |
| * Function irlap_send_data_primary_poll (self, skb) |
| * |
| * Send I(nformation) frame as primary with poll bit set |
| */ |
| void irlap_send_data_primary_poll(struct irlap_cb *self, struct sk_buff *skb) |
| { |
| struct sk_buff *tx_skb; |
| int transmission_time; |
| |
| /* Stop P timer */ |
| del_timer(&self->poll_timer); |
| |
| /* Is this reliable or unreliable data? */ |
| if (skb->data[1] == I_FRAME) { |
| |
| /* |
| * Insert frame sequence number (Vs) in control field before |
| * inserting into transmit window queue. |
| */ |
| skb->data[1] = I_FRAME | (self->vs << 1); |
| |
| /* |
| * Insert frame in store, in case of retransmissions |
| * Increase skb reference count, see irlap_do_event() |
| */ |
| skb_get(skb); |
| skb_queue_tail(&self->wx_list, skb); |
| |
| /* Copy buffer */ |
| tx_skb = skb_clone(skb, GFP_ATOMIC); |
| if (tx_skb == NULL) { |
| return; |
| } |
| |
| /* |
| * Set poll bit if necessary. We do this to the copied |
| * skb, since retransmitted need to set or clear the poll |
| * bit depending on when they are sent. |
| */ |
| tx_skb->data[1] |= PF_BIT; |
| |
| self->vs = (self->vs + 1) % 8; |
| self->ack_required = FALSE; |
| |
| irlap_send_i_frame(self, tx_skb, CMD_FRAME); |
| } else { |
| IRDA_DEBUG(4, "%s(), sending unreliable frame\n", __FUNCTION__); |
| |
| if (self->ack_required) { |
| irlap_send_ui_frame(self, skb_get(skb), self->caddr, CMD_FRAME); |
| irlap_send_rr_frame(self, CMD_FRAME); |
| self->ack_required = FALSE; |
| } else { |
| skb->data[1] |= PF_BIT; |
| irlap_send_ui_frame(self, skb_get(skb), self->caddr, CMD_FRAME); |
| } |
| } |
| |
| /* How much time we took for transmission of all frames. |
| * We don't know, so let assume we used the full window. Jean II */ |
| transmission_time = self->final_timeout; |
| |
| /* Reset parameter so that we can fill next window */ |
| self->window = self->window_size; |
| |
| #ifdef CONFIG_IRDA_DYNAMIC_WINDOW |
| /* Remove what we have not used. Just do a prorata of the |
| * bytes left in window to window capacity. |
| * See max_line_capacities[][] in qos.c for details. Jean II */ |
| transmission_time -= (self->final_timeout * self->bytes_left |
| / self->line_capacity); |
| IRDA_DEBUG(4, "%s() adjusting transmission_time : ft=%d, bl=%d, lc=%d -> tt=%d\n", __FUNCTION__, self->final_timeout, self->bytes_left, self->line_capacity, transmission_time); |
| |
| /* We are allowed to transmit a maximum number of bytes again. */ |
| self->bytes_left = self->line_capacity; |
| #endif /* CONFIG_IRDA_DYNAMIC_WINDOW */ |
| |
| /* |
| * The network layer has a intermediate buffer between IrLAP |
| * and the IrDA driver which can contain 8 frames. So, even |
| * though IrLAP is currently sending the *last* frame of the |
| * tx-window, the driver most likely has only just started |
| * sending the *first* frame of the same tx-window. |
| * I.e. we are always at the very begining of or Tx window. |
| * Now, we are supposed to set the final timer from the end |
| * of our tx-window to let the other peer reply. So, we need |
| * to add extra time to compensate for the fact that we |
| * are really at the start of tx-window, otherwise the final timer |
| * might expire before he can answer... |
| * Jean II |
| */ |
| irlap_start_final_timer(self, self->final_timeout + transmission_time); |
| |
| /* |
| * The clever amongst you might ask why we do this adjustement |
| * only here, and not in all the other cases in irlap_event.c. |
| * In all those other case, we only send a very short management |
| * frame (few bytes), so the adjustement would be lost in the |
| * noise... |
| * The exception of course is irlap_resend_rejected_frame(). |
| * Jean II */ |
| } |
| |
| /* |
| * Function irlap_send_data_secondary_final (self, skb) |
| * |
| * Send I(nformation) frame as secondary with final bit set |
| * |
| */ |
| void irlap_send_data_secondary_final(struct irlap_cb *self, |
| struct sk_buff *skb) |
| { |
| struct sk_buff *tx_skb = NULL; |
| |
| IRDA_ASSERT(self != NULL, return;); |
| IRDA_ASSERT(self->magic == LAP_MAGIC, return;); |
| IRDA_ASSERT(skb != NULL, return;); |
| |
| /* Is this reliable or unreliable data? */ |
| if (skb->data[1] == I_FRAME) { |
| |
| /* |
| * Insert frame sequence number (Vs) in control field before |
| * inserting into transmit window queue. |
| */ |
| skb->data[1] = I_FRAME | (self->vs << 1); |
| |
| /* |
| * Insert frame in store, in case of retransmissions |
| * Increase skb reference count, see irlap_do_event() |
| */ |
| skb_get(skb); |
| skb_queue_tail(&self->wx_list, skb); |
| |
| tx_skb = skb_clone(skb, GFP_ATOMIC); |
| if (tx_skb == NULL) { |
| return; |
| } |
| |
| tx_skb->data[1] |= PF_BIT; |
| |
| self->vs = (self->vs + 1) % 8; |
| self->ack_required = FALSE; |
| |
| irlap_send_i_frame(self, tx_skb, RSP_FRAME); |
| } else { |
| if (self->ack_required) { |
| irlap_send_ui_frame(self, skb_get(skb), self->caddr, RSP_FRAME); |
| irlap_send_rr_frame(self, RSP_FRAME); |
| self->ack_required = FALSE; |
| } else { |
| skb->data[1] |= PF_BIT; |
| irlap_send_ui_frame(self, skb_get(skb), self->caddr, RSP_FRAME); |
| } |
| } |
| |
| self->window = self->window_size; |
| #ifdef CONFIG_IRDA_DYNAMIC_WINDOW |
| /* We are allowed to transmit a maximum number of bytes again. */ |
| self->bytes_left = self->line_capacity; |
| #endif /* CONFIG_IRDA_DYNAMIC_WINDOW */ |
| |
| irlap_start_wd_timer(self, self->wd_timeout); |
| } |
| |
| /* |
| * Function irlap_send_data_secondary (self, skb) |
| * |
| * Send I(nformation) frame as secondary without final bit set |
| * |
| */ |
| void irlap_send_data_secondary(struct irlap_cb *self, struct sk_buff *skb) |
| { |
| struct sk_buff *tx_skb = NULL; |
| |
| /* Is this reliable or unreliable data? */ |
| if (skb->data[1] == I_FRAME) { |
| |
| /* |
| * Insert frame sequence number (Vs) in control field before |
| * inserting into transmit window queue. |
| */ |
| skb->data[1] = I_FRAME | (self->vs << 1); |
| |
| /* |
| * Insert frame in store, in case of retransmissions |
| * Increase skb reference count, see irlap_do_event() |
| */ |
| skb_get(skb); |
| skb_queue_tail(&self->wx_list, skb); |
| |
| tx_skb = skb_clone(skb, GFP_ATOMIC); |
| if (tx_skb == NULL) { |
| return; |
| } |
| |
| self->vs = (self->vs + 1) % 8; |
| self->ack_required = FALSE; |
| self->window -= 1; |
| |
| irlap_send_i_frame(self, tx_skb, RSP_FRAME); |
| } else { |
| irlap_send_ui_frame(self, skb_get(skb), self->caddr, RSP_FRAME); |
| self->window -= 1; |
| } |
| } |
| |
| /* |
| * Function irlap_resend_rejected_frames (nr) |
| * |
| * Resend frames which has not been acknowledged. Should be safe to |
| * traverse the list without locking it since this function will only be |
| * called from interrupt context (BH) |
| */ |
| void irlap_resend_rejected_frames(struct irlap_cb *self, int command) |
| { |
| struct sk_buff *tx_skb; |
| struct sk_buff *skb; |
| int count; |
| |
| IRDA_ASSERT(self != NULL, return;); |
| IRDA_ASSERT(self->magic == LAP_MAGIC, return;); |
| |
| /* Initialize variables */ |
| count = skb_queue_len(&self->wx_list); |
| |
| /* Resend unacknowledged frame(s) */ |
| skb = skb_peek(&self->wx_list); |
| while (skb != NULL) { |
| irlap_wait_min_turn_around(self, &self->qos_tx); |
| |
| /* We copy the skb to be retransmitted since we will have to |
| * modify it. Cloning will confuse packet sniffers |
| */ |
| /* tx_skb = skb_clone( skb, GFP_ATOMIC); */ |
| tx_skb = skb_copy(skb, GFP_ATOMIC); |
| if (!tx_skb) { |
| IRDA_DEBUG(0, "%s(), unable to copy\n", __FUNCTION__); |
| return; |
| } |
| |
| /* Clear old Nr field + poll bit */ |
| tx_skb->data[1] &= 0x0f; |
| |
| /* |
| * Set poll bit on the last frame retransmitted |
| */ |
| if (count-- == 1) |
| tx_skb->data[1] |= PF_BIT; /* Set p/f bit */ |
| else |
| tx_skb->data[1] &= ~PF_BIT; /* Clear p/f bit */ |
| |
| irlap_send_i_frame(self, tx_skb, command); |
| |
| /* |
| * If our skb is the last buffer in the list, then |
| * we are finished, if not, move to the next sk-buffer |
| */ |
| if (skb == skb_peek_tail(&self->wx_list)) |
| skb = NULL; |
| else |
| skb = skb->next; |
| } |
| #if 0 /* Not yet */ |
| /* |
| * We can now fill the window with additional data frames |
| */ |
| while (!skb_queue_empty(&self->txq)) { |
| |
| IRDA_DEBUG(0, "%s(), sending additional frames!\n", __FUNCTION__); |
| if (self->window > 0) { |
| skb = skb_dequeue( &self->txq); |
| IRDA_ASSERT(skb != NULL, return;); |
| |
| /* |
| * If send window > 1 then send frame with pf |
| * bit cleared |
| */ |
| if ((self->window > 1) && |
| !skb_queue_empty(&self->txq)) { |
| irlap_send_data_primary(self, skb); |
| } else { |
| irlap_send_data_primary_poll(self, skb); |
| } |
| kfree_skb(skb); |
| } |
| } |
| #endif |
| } |
| |
| void irlap_resend_rejected_frame(struct irlap_cb *self, int command) |
| { |
| struct sk_buff *tx_skb; |
| struct sk_buff *skb; |
| |
| IRDA_ASSERT(self != NULL, return;); |
| IRDA_ASSERT(self->magic == LAP_MAGIC, return;); |
| |
| /* Resend unacknowledged frame(s) */ |
| skb = skb_peek(&self->wx_list); |
| if (skb != NULL) { |
| irlap_wait_min_turn_around(self, &self->qos_tx); |
| |
| /* We copy the skb to be retransmitted since we will have to |
| * modify it. Cloning will confuse packet sniffers |
| */ |
| /* tx_skb = skb_clone( skb, GFP_ATOMIC); */ |
| tx_skb = skb_copy(skb, GFP_ATOMIC); |
| if (!tx_skb) { |
| IRDA_DEBUG(0, "%s(), unable to copy\n", __FUNCTION__); |
| return; |
| } |
| |
| /* Clear old Nr field + poll bit */ |
| tx_skb->data[1] &= 0x0f; |
| |
| /* Set poll/final bit */ |
| tx_skb->data[1] |= PF_BIT; /* Set p/f bit */ |
| |
| irlap_send_i_frame(self, tx_skb, command); |
| } |
| } |
| |
| /* |
| * Function irlap_send_ui_frame (self, skb, command) |
| * |
| * Contruct and transmit an Unnumbered Information (UI) frame |
| * |
| */ |
| void irlap_send_ui_frame(struct irlap_cb *self, struct sk_buff *skb, |
| __u8 caddr, int command) |
| { |
| IRDA_DEBUG(4, "%s()\n", __FUNCTION__); |
| |
| IRDA_ASSERT(self != NULL, return;); |
| IRDA_ASSERT(self->magic == LAP_MAGIC, return;); |
| IRDA_ASSERT(skb != NULL, return;); |
| |
| /* Insert connection address */ |
| skb->data[0] = caddr | ((command) ? CMD_FRAME : 0); |
| |
| irlap_queue_xmit(self, skb); |
| } |
| |
| /* |
| * Function irlap_send_i_frame (skb) |
| * |
| * Contruct and transmit Information (I) frame |
| */ |
| static void irlap_send_i_frame(struct irlap_cb *self, struct sk_buff *skb, |
| int command) |
| { |
| /* Insert connection address */ |
| skb->data[0] = self->caddr; |
| skb->data[0] |= (command) ? CMD_FRAME : 0; |
| |
| /* Insert next to receive (Vr) */ |
| skb->data[1] |= (self->vr << 5); /* insert nr */ |
| |
| irlap_queue_xmit(self, skb); |
| } |
| |
| /* |
| * Function irlap_recv_i_frame (skb, frame) |
| * |
| * Receive and parse an I (Information) frame, no harm in making it inline |
| * since it's called only from one single place (irlap_driver_rcv). |
| */ |
| static inline void irlap_recv_i_frame(struct irlap_cb *self, |
| struct sk_buff *skb, |
| struct irlap_info *info, int command) |
| { |
| info->nr = skb->data[1] >> 5; /* Next to receive */ |
| info->pf = skb->data[1] & PF_BIT; /* Final bit */ |
| info->ns = (skb->data[1] >> 1) & 0x07; /* Next to send */ |
| |
| /* Check if this is a command or a response frame */ |
| if (command) |
| irlap_do_event(self, RECV_I_CMD, skb, info); |
| else |
| irlap_do_event(self, RECV_I_RSP, skb, info); |
| } |
| |
| /* |
| * Function irlap_recv_ui_frame (self, skb, info) |
| * |
| * Receive and parse an Unnumbered Information (UI) frame |
| * |
| */ |
| static void irlap_recv_ui_frame(struct irlap_cb *self, struct sk_buff *skb, |
| struct irlap_info *info) |
| { |
| IRDA_DEBUG( 4, "%s()\n", __FUNCTION__); |
| |
| info->pf = skb->data[1] & PF_BIT; /* Final bit */ |
| |
| irlap_do_event(self, RECV_UI_FRAME, skb, info); |
| } |
| |
| /* |
| * Function irlap_recv_frmr_frame (skb, frame) |
| * |
| * Received Frame Reject response. |
| * |
| */ |
| static void irlap_recv_frmr_frame(struct irlap_cb *self, struct sk_buff *skb, |
| struct irlap_info *info) |
| { |
| __u8 *frame; |
| int w, x, y, z; |
| |
| IRDA_DEBUG(0, "%s()\n", __FUNCTION__); |
| |
| IRDA_ASSERT(self != NULL, return;); |
| IRDA_ASSERT(self->magic == LAP_MAGIC, return;); |
| IRDA_ASSERT(skb != NULL, return;); |
| IRDA_ASSERT(info != NULL, return;); |
| |
| if (!pskb_may_pull(skb, 4)) { |
| IRDA_ERROR("%s: frame to short!\n", __FUNCTION__); |
| return; |
| } |
| |
| frame = skb->data; |
| |
| info->nr = frame[2] >> 5; /* Next to receive */ |
| info->pf = frame[2] & PF_BIT; /* Final bit */ |
| info->ns = (frame[2] >> 1) & 0x07; /* Next to send */ |
| |
| w = frame[3] & 0x01; |
| x = frame[3] & 0x02; |
| y = frame[3] & 0x04; |
| z = frame[3] & 0x08; |
| |
| if (w) { |
| IRDA_DEBUG(0, "Rejected control field is undefined or not " |
| "implemented.\n"); |
| } |
| if (x) { |
| IRDA_DEBUG(0, "Rejected control field was invalid because it " |
| "contained a non permitted I field.\n"); |
| } |
| if (y) { |
| IRDA_DEBUG(0, "Received I field exceeded the maximum negotiated " |
| "for the existing connection or exceeded the maximum " |
| "this station supports if no connection exists.\n"); |
| } |
| if (z) { |
| IRDA_DEBUG(0, "Rejected control field control field contained an " |
| "invalid Nr count.\n"); |
| } |
| irlap_do_event(self, RECV_FRMR_RSP, skb, info); |
| } |
| |
| /* |
| * Function irlap_send_test_frame (self, daddr) |
| * |
| * Send a test frame response |
| * |
| */ |
| void irlap_send_test_frame(struct irlap_cb *self, __u8 caddr, __u32 daddr, |
| struct sk_buff *cmd) |
| { |
| struct sk_buff *tx_skb; |
| struct test_frame *frame; |
| __u8 *info; |
| |
| tx_skb = alloc_skb(cmd->len + sizeof(struct test_frame), GFP_ATOMIC); |
| if (!tx_skb) |
| return; |
| |
| /* Broadcast frames must include saddr and daddr fields */ |
| if (caddr == CBROADCAST) { |
| frame = (struct test_frame *) |
| skb_put(tx_skb, sizeof(struct test_frame)); |
| |
| /* Insert the swapped addresses */ |
| frame->saddr = cpu_to_le32(self->saddr); |
| frame->daddr = cpu_to_le32(daddr); |
| } else |
| frame = (struct test_frame *) skb_put(tx_skb, LAP_ADDR_HEADER + LAP_CTRL_HEADER); |
| |
| frame->caddr = caddr; |
| frame->control = TEST_RSP | PF_BIT; |
| |
| /* Copy info */ |
| info = skb_put(tx_skb, cmd->len); |
| memcpy(info, cmd->data, cmd->len); |
| |
| /* Return to sender */ |
| irlap_wait_min_turn_around(self, &self->qos_tx); |
| irlap_queue_xmit(self, tx_skb); |
| } |
| |
| /* |
| * Function irlap_recv_test_frame (self, skb) |
| * |
| * Receive a test frame |
| * |
| */ |
| static void irlap_recv_test_frame(struct irlap_cb *self, struct sk_buff *skb, |
| struct irlap_info *info, int command) |
| { |
| struct test_frame *frame; |
| |
| IRDA_DEBUG(2, "%s()\n", __FUNCTION__); |
| |
| if (!pskb_may_pull(skb, sizeof(*frame))) { |
| IRDA_ERROR("%s: frame to short!\n", __FUNCTION__); |
| return; |
| } |
| frame = (struct test_frame *) skb->data; |
| |
| /* Broadcast frames must carry saddr and daddr fields */ |
| if (info->caddr == CBROADCAST) { |
| if (skb->len < sizeof(struct test_frame)) { |
| IRDA_DEBUG(0, "%s() test frame to short!\n", |
| __FUNCTION__); |
| return; |
| } |
| |
| /* Read and swap addresses */ |
| info->daddr = le32_to_cpu(frame->saddr); |
| info->saddr = le32_to_cpu(frame->daddr); |
| |
| /* Make sure frame is addressed to us */ |
| if ((info->saddr != self->saddr) && |
| (info->saddr != BROADCAST)) { |
| return; |
| } |
| } |
| |
| if (command) |
| irlap_do_event(self, RECV_TEST_CMD, skb, info); |
| else |
| irlap_do_event(self, RECV_TEST_RSP, skb, info); |
| } |
| |
| /* |
| * Function irlap_driver_rcv (skb, netdev, ptype) |
| * |
| * Called when a frame is received. Dispatches the right receive function |
| * for processing of the frame. |
| * |
| * Note on skb management : |
| * After calling the higher layers of the IrDA stack, we always |
| * kfree() the skb, which drop the reference count (and potentially |
| * destroy it). |
| * If a higher layer of the stack want to keep the skb around (to put |
| * in a queue or pass it to the higher layer), it will need to use |
| * skb_get() to keep a reference on it. This is usually done at the |
| * LMP level in irlmp.c. |
| * Jean II |
| */ |
| int irlap_driver_rcv(struct sk_buff *skb, struct net_device *dev, |
| struct packet_type *ptype, struct net_device *orig_dev) |
| { |
| struct irlap_info info; |
| struct irlap_cb *self; |
| int command; |
| __u8 control; |
| |
| /* FIXME: should we get our own field? */ |
| self = (struct irlap_cb *) dev->atalk_ptr; |
| |
| /* If the net device is down, then IrLAP is gone! */ |
| if (!self || self->magic != LAP_MAGIC) { |
| dev_kfree_skb(skb); |
| return -1; |
| } |
| |
| /* We are no longer an "old" protocol, so we need to handle |
| * share and non linear skbs. This should never happen, so |
| * we don't need to be clever about it. Jean II */ |
| if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) { |
| IRDA_ERROR("%s: can't clone shared skb!\n", __FUNCTION__); |
| dev_kfree_skb(skb); |
| return -1; |
| } |
| |
| /* Check if frame is large enough for parsing */ |
| if (!pskb_may_pull(skb, 2)) { |
| IRDA_ERROR("%s: frame to short!\n", __FUNCTION__); |
| dev_kfree_skb(skb); |
| return -1; |
| } |
| |
| command = skb->data[0] & CMD_FRAME; |
| info.caddr = skb->data[0] & CBROADCAST; |
| |
| info.pf = skb->data[1] & PF_BIT; |
| info.control = skb->data[1] & ~PF_BIT; /* Mask away poll/final bit */ |
| |
| control = info.control; |
| |
| /* First we check if this frame has a valid connection address */ |
| if ((info.caddr != self->caddr) && (info.caddr != CBROADCAST)) { |
| IRDA_DEBUG(0, "%s(), wrong connection address!\n", |
| __FUNCTION__); |
| goto out; |
| } |
| /* |
| * Optimize for the common case and check if the frame is an |
| * I(nformation) frame. Only I-frames have bit 0 set to 0 |
| */ |
| if (~control & 0x01) { |
| irlap_recv_i_frame(self, skb, &info, command); |
| goto out; |
| } |
| /* |
| * We now check is the frame is an S(upervisory) frame. Only |
| * S-frames have bit 0 set to 1 and bit 1 set to 0 |
| */ |
| if (~control & 0x02) { |
| /* |
| * Received S(upervisory) frame, check which frame type it is |
| * only the first nibble is of interest |
| */ |
| switch (control & 0x0f) { |
| case RR: |
| irlap_recv_rr_frame(self, skb, &info, command); |
| break; |
| case RNR: |
| irlap_recv_rnr_frame(self, skb, &info, command); |
| break; |
| case REJ: |
| irlap_recv_rej_frame(self, skb, &info, command); |
| break; |
| case SREJ: |
| irlap_recv_srej_frame(self, skb, &info, command); |
| break; |
| default: |
| IRDA_WARNING("%s: Unknown S-frame %02x received!\n", |
| __FUNCTION__, info.control); |
| break; |
| } |
| goto out; |
| } |
| /* |
| * This must be a C(ontrol) frame |
| */ |
| switch (control) { |
| case XID_RSP: |
| irlap_recv_discovery_xid_rsp(self, skb, &info); |
| break; |
| case XID_CMD: |
| irlap_recv_discovery_xid_cmd(self, skb, &info); |
| break; |
| case SNRM_CMD: |
| irlap_recv_snrm_cmd(self, skb, &info); |
| break; |
| case DM_RSP: |
| irlap_do_event(self, RECV_DM_RSP, skb, &info); |
| break; |
| case DISC_CMD: /* And RD_RSP since they have the same value */ |
| irlap_recv_disc_frame(self, skb, &info, command); |
| break; |
| case TEST_CMD: |
| irlap_recv_test_frame(self, skb, &info, command); |
| break; |
| case UA_RSP: |
| irlap_recv_ua_frame(self, skb, &info); |
| break; |
| case FRMR_RSP: |
| irlap_recv_frmr_frame(self, skb, &info); |
| break; |
| case UI_FRAME: |
| irlap_recv_ui_frame(self, skb, &info); |
| break; |
| default: |
| IRDA_WARNING("%s: Unknown frame %02x received!\n", |
| __FUNCTION__, info.control); |
| break; |
| } |
| out: |
| /* Always drop our reference on the skb */ |
| dev_kfree_skb(skb); |
| return 0; |
| } |