~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/net/llc/llc_if.c

Version: ~ [ linux-5.8 ] ~ [ linux-5.7.12 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.55 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.136 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.191 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.232 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.232 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.85 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * llc_if.c - Defines LLC interface to upper layer
  3  *
  4  * Copyright (c) 1997 by Procom Technology, Inc.
  5  *               2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
  6  *
  7  * This program can be redistributed or modified under the terms of the
  8  * GNU General Public License as published by the Free Software Foundation.
  9  * This program is distributed without any warranty or implied warranty
 10  * of merchantability or fitness for a particular purpose.
 11  *
 12  * See the GNU General Public License for more details.
 13  */
 14 #include <linux/gfp.h>
 15 #include <linux/module.h>
 16 #include <linux/kernel.h>
 17 #include <linux/netdevice.h>
 18 #include <linux/errno.h>
 19 #include <net/llc_if.h>
 20 #include <net/llc_sap.h>
 21 #include <net/llc_s_ev.h>
 22 #include <net/llc_conn.h>
 23 #include <net/sock.h>
 24 #include <net/llc_c_ev.h>
 25 #include <net/llc_c_ac.h>
 26 #include <net/llc_c_st.h>
 27 #include <net/tcp_states.h>
 28 
 29 /**
 30  *      llc_build_and_send_pkt - Connection data sending for upper layers.
 31  *      @sk: connection
 32  *      @skb: packet to send
 33  *
 34  *      This function is called when upper layer wants to send data using
 35  *      connection oriented communication mode. During sending data, connection
 36  *      will be locked and received frames and expired timers will be queued.
 37  *      Returns 0 for success, -ECONNABORTED when the connection already
 38  *      closed and -EBUSY when sending data is not permitted in this state or
 39  *      LLC has send an I pdu with p bit set to 1 and is waiting for it's
 40  *      response.
 41  */
 42 int llc_build_and_send_pkt(struct sock *sk, struct sk_buff *skb)
 43 {
 44         struct llc_conn_state_ev *ev;
 45         int rc = -ECONNABORTED;
 46         struct llc_sock *llc = llc_sk(sk);
 47 
 48         if (unlikely(llc->state == LLC_CONN_STATE_ADM))
 49                 goto out;
 50         rc = -EBUSY;
 51         if (unlikely(llc_data_accept_state(llc->state) || /* data_conn_refuse */
 52                      llc->p_flag)) {
 53                 llc->failed_data_req = 1;
 54                 goto out;
 55         }
 56         ev = llc_conn_ev(skb);
 57         ev->type      = LLC_CONN_EV_TYPE_PRIM;
 58         ev->prim      = LLC_DATA_PRIM;
 59         ev->prim_type = LLC_PRIM_TYPE_REQ;
 60         skb->dev      = llc->dev;
 61         rc = llc_conn_state_process(sk, skb);
 62 out:
 63         return rc;
 64 }
 65 
 66 /**
 67  *      llc_establish_connection - Called by upper layer to establish a conn
 68  *      @sk: connection
 69  *      @lmac: local mac address
 70  *      @dmac: destination mac address
 71  *      @dsap: destination sap
 72  *
 73  *      Upper layer calls this to establish an LLC connection with a remote
 74  *      machine. This function packages a proper event and sends it connection
 75  *      component state machine. Success or failure of connection
 76  *      establishment will inform to upper layer via calling it's confirm
 77  *      function and passing proper information.
 78  */
 79 int llc_establish_connection(struct sock *sk, u8 *lmac, u8 *dmac, u8 dsap)
 80 {
 81         int rc = -EISCONN;
 82         struct llc_addr laddr, daddr;
 83         struct sk_buff *skb;
 84         struct llc_sock *llc = llc_sk(sk);
 85         struct sock *existing;
 86 
 87         laddr.lsap = llc->sap->laddr.lsap;
 88         daddr.lsap = dsap;
 89         memcpy(daddr.mac, dmac, sizeof(daddr.mac));
 90         memcpy(laddr.mac, lmac, sizeof(laddr.mac));
 91         existing = llc_lookup_established(llc->sap, &daddr, &laddr);
 92         if (existing) {
 93                 if (existing->sk_state == TCP_ESTABLISHED) {
 94                         sk = existing;
 95                         goto out_put;
 96                 } else
 97                         sock_put(existing);
 98         }
 99         sock_hold(sk);
100         rc = -ENOMEM;
101         skb = alloc_skb(0, GFP_ATOMIC);
102         if (skb) {
103                 struct llc_conn_state_ev *ev = llc_conn_ev(skb);
104 
105                 ev->type      = LLC_CONN_EV_TYPE_PRIM;
106                 ev->prim      = LLC_CONN_PRIM;
107                 ev->prim_type = LLC_PRIM_TYPE_REQ;
108                 skb_set_owner_w(skb, sk);
109                 rc = llc_conn_state_process(sk, skb);
110         }
111 out_put:
112         sock_put(sk);
113         return rc;
114 }
115 
116 /**
117  *      llc_send_disc - Called by upper layer to close a connection
118  *      @sk: connection to be closed
119  *
120  *      Upper layer calls this when it wants to close an established LLC
121  *      connection with a remote machine. This function packages a proper event
122  *      and sends it to connection component state machine. Returns 0 for
123  *      success, 1 otherwise.
124  */
125 int llc_send_disc(struct sock *sk)
126 {
127         u16 rc = 1;
128         struct llc_conn_state_ev *ev;
129         struct sk_buff *skb;
130 
131         sock_hold(sk);
132         if (sk->sk_type != SOCK_STREAM || sk->sk_state != TCP_ESTABLISHED ||
133             llc_sk(sk)->state == LLC_CONN_STATE_ADM ||
134             llc_sk(sk)->state == LLC_CONN_OUT_OF_SVC)
135                 goto out;
136         /*
137          * Postpone unassigning the connection from its SAP and returning the
138          * connection until all ACTIONs have been completely executed
139          */
140         skb = alloc_skb(0, GFP_ATOMIC);
141         if (!skb)
142                 goto out;
143         skb_set_owner_w(skb, sk);
144         sk->sk_state  = TCP_CLOSING;
145         ev            = llc_conn_ev(skb);
146         ev->type      = LLC_CONN_EV_TYPE_PRIM;
147         ev->prim      = LLC_DISC_PRIM;
148         ev->prim_type = LLC_PRIM_TYPE_REQ;
149         rc = llc_conn_state_process(sk, skb);
150 out:
151         sock_put(sk);
152         return rc;
153 }
154 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp