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08e6d907fe
linux/net/llc/llc_c_ac.c
Tejun Heo 5a0e3ad6af include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files.  percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.

percpu.h -> slab.h dependency is about to be removed.  Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability.  As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.

  http://userweb.kernel.org/~tj/misc/slabh-sweep.py

The script does the followings.

* Scan files for gfp and slab usages and update includes such that
  only the necessary includes are there.  ie. if only gfp is used,
  gfp.h, if slab is used, slab.h.

* When the script inserts a new include, it looks at the include
  blocks and try to put the new include such that its order conforms
  to its surrounding.  It's put in the include block which contains
  core kernel includes, in the same order that the rest are ordered -
  alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
  doesn't seem to be any matching order.

* If the script can't find a place to put a new include (mostly
  because the file doesn't have fitting include block), it prints out
  an error message indicating which .h file needs to be added to the
  file.

The conversion was done in the following steps.

1. The initial automatic conversion of all .c files updated slightly
   over 4000 files, deleting around 700 includes and adding ~480 gfp.h
   and ~3000 slab.h inclusions.  The script emitted errors for ~400
   files.

2. Each error was manually checked.  Some didn't need the inclusion,
   some needed manual addition while adding it to implementation .h or
   embedding .c file was more appropriate for others.  This step added
   inclusions to around 150 files.

3. The script was run again and the output was compared to the edits
   from #2 to make sure no file was left behind.

4. Several build tests were done and a couple of problems were fixed.
   e.g. lib/decompress_*.c used malloc/free() wrappers around slab
   APIs requiring slab.h to be added manually.

5. The script was run on all .h files but without automatically
   editing them as sprinkling gfp.h and slab.h inclusions around .h
   files could easily lead to inclusion dependency hell.  Most gfp.h
   inclusion directives were ignored as stuff from gfp.h was usually
   wildly available and often used in preprocessor macros.  Each
   slab.h inclusion directive was examined and added manually as
   necessary.

6. percpu.h was updated not to include slab.h.

7. Build test were done on the following configurations and failures
   were fixed.  CONFIG_GCOV_KERNEL was turned off for all tests (as my
   distributed build env didn't work with gcov compiles) and a few
   more options had to be turned off depending on archs to make things
   build (like ipr on powerpc/64 which failed due to missing writeq).

   * x86 and x86_64 UP and SMP allmodconfig and a custom test config.
   * powerpc and powerpc64 SMP allmodconfig
   * sparc and sparc64 SMP allmodconfig
   * ia64 SMP allmodconfig
   * s390 SMP allmodconfig
   * alpha SMP allmodconfig
   * um on x86_64 SMP allmodconfig

8. percpu.h modifications were reverted so that it could be applied as
   a separate patch and serve as bisection point.

Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.

Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-30 22:02:32 +09:00

1445 lines
35 KiB
C
Raw Blame History

/*
* 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);
}
}
}
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