Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 316 insertions, 0 deletions

diff --git a/net/llc/llc_sap.c b/net/llc/llc_sap.c
new file mode 100644
index 00000000000..965c94eb4bb
--- /dev/null
+++ b/net/llc/llc_sap.c
@@ -0,0 +1,316 @@
+/*
+ * llc_sap.c - driver routines for SAP component.
+ *
+ * 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 <net/llc.h>
+#include <net/llc_if.h>
+#include <net/llc_conn.h>
+#include <net/llc_pdu.h>
+#include <net/llc_sap.h>
+#include <net/llc_s_ac.h>
+#include <net/llc_s_ev.h>
+#include <net/llc_s_st.h>
+#include <net/sock.h>
+#include <linux/tcp.h>
+#include <linux/llc.h>
+
+/**
+ *      llc_alloc_frame - allocates sk_buff for frame
+ *
+ *      Allocates an sk_buff for frame and initializes sk_buff fields.
+ *      Returns allocated skb or %NULL when out of memory.
+ */
+struct sk_buff *llc_alloc_frame(void)
+{
+        struct sk_buff *skb = alloc_skb(128, GFP_ATOMIC);
+
+        if (skb) {
+                skb_reserve(skb, 50);
+                skb->nh.raw   = skb->h.raw = skb->data;
+                skb->protocol = htons(ETH_P_802_2);
+                skb->dev      = dev_base->next;
+                skb->mac.raw  = skb->head;
+        }
+        return skb;
+}
+
+void llc_save_primitive(struct sk_buff* skb, u8 prim)
+{
+        struct sockaddr_llc *addr = llc_ui_skb_cb(skb);
+
+       /* save primitive for use by the user. */
+        addr->sllc_family = skb->sk->sk_family;
+        addr->sllc_arphrd = skb->dev->type;
+        addr->sllc_test   = prim == LLC_TEST_PRIM;
+        addr->sllc_xid    = prim == LLC_XID_PRIM;
+        addr->sllc_ua     = prim == LLC_DATAUNIT_PRIM;
+        llc_pdu_decode_sa(skb, addr->sllc_mac);
+        llc_pdu_decode_ssap(skb, &addr->sllc_sap);
+}
+
+/**
+ *      llc_sap_rtn_pdu - Informs upper layer on rx of an UI, XID or TEST pdu.
+ *      @sap: pointer to SAP
+ *      @skb: received pdu
+ */
+void llc_sap_rtn_pdu(struct llc_sap *sap, struct sk_buff *skb)
+{
+        struct llc_sap_state_ev *ev = llc_sap_ev(skb);
+        struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
+
+        switch (LLC_U_PDU_RSP(pdu)) {
+        case LLC_1_PDU_CMD_TEST:
+                ev->prim = LLC_TEST_PRIM;       break;
+        case LLC_1_PDU_CMD_XID:
+                ev->prim = LLC_XID_PRIM;        break;
+        case LLC_1_PDU_CMD_UI:
+                ev->prim = LLC_DATAUNIT_PRIM;   break;
+        }
+        ev->ind_cfm_flag = LLC_IND;
+}
+
+/**
+ *      llc_find_sap_trans - finds transition for event
+ *      @sap: pointer to SAP
+ *      @skb: happened event
+ *
+ *      This function finds transition that matches with happened event.
+ *      Returns the pointer to found transition on success or %NULL for
+ *      failure.
+ */
+static struct llc_sap_state_trans *llc_find_sap_trans(struct llc_sap *sap,
+                                                      struct sk_buff* skb)
+{
+        int i = 0;
+        struct llc_sap_state_trans *rc = NULL;
+        struct llc_sap_state_trans **next_trans;
+        struct llc_sap_state *curr_state = &llc_sap_state_table[sap->state - 1];
+        /*
+         * Search thru events for this state until list exhausted or until
+         * its obvious the event is not valid for the current state
+         */
+        for (next_trans = curr_state->transitions; next_trans[i]->ev; i++)
+                if (!next_trans[i]->ev(sap, skb)) {
+                        rc = next_trans[i]; /* got event match; return it */
+                        break;
+                }
+        return rc;
+}
+
+/**
+ *      llc_exec_sap_trans_actions - execute actions related to event
+ *      @sap: pointer to SAP
+ *      @trans: pointer to transition that it's actions must be performed
+ *      @skb: happened event.
+ *
+ *      This function executes actions that is related to happened event.
+ *      Returns 0 for success and 1 for failure of at least one action.
+ */
+static int llc_exec_sap_trans_actions(struct llc_sap *sap,
+                                      struct llc_sap_state_trans *trans,
+                                      struct sk_buff *skb)
+{
+        int rc = 0;
+        llc_sap_action_t *next_action = trans->ev_actions;
+
+        for (; next_action && *next_action; next_action++)
+                if ((*next_action)(sap, skb))
+                        rc = 1;
+        return rc;
+}
+
+/**
+ *      llc_sap_next_state - finds transition, execs actions & change SAP state
+ *      @sap: pointer to SAP
+ *      @skb: happened event
+ *
+ *      This function finds transition that matches with happened event, then
+ *      executes related actions and finally changes state of SAP. It returns
+ *      0 on success and 1 for failure.
+ */
+static int llc_sap_next_state(struct llc_sap *sap, struct sk_buff *skb)
+{
+        int rc = 1;
+        struct llc_sap_state_trans *trans;
+
+        if (sap->state > LLC_NR_SAP_STATES)
+                goto out;
+        trans = llc_find_sap_trans(sap, skb);
+        if (!trans)
+                goto out;
+        /*
+         * Got the state to which we next transition; perform the actions
+         * associated with this transition before actually transitioning to the
+         * next state
+         */
+        rc = llc_exec_sap_trans_actions(sap, trans, skb);
+        if (rc)
+                goto out;
+        /*
+         * Transition SAP to next state if all actions execute successfully
+         */
+        sap->state = trans->next_state;
+out:
+        return rc;
+}
+
+/**
+ *      llc_sap_state_process - sends event to SAP state machine
+ *      @sap: sap to use
+ *      @skb: pointer to occurred event
+ *
+ *      After executing actions of the event, upper layer will be indicated
+ *      if needed(on receiving an UI frame). sk can be null for the
+ *      datalink_proto case.
+ */
+static void llc_sap_state_process(struct llc_sap *sap, struct sk_buff *skb)
+{
+        struct llc_sap_state_ev *ev = llc_sap_ev(skb);
+
+        /*
+         * We have to hold the skb, because llc_sap_next_state
+         * will kfree it in the sending path and we need to
+         * look at the skb->cb, where we encode llc_sap_state_ev.
+         */
+        skb_get(skb);
+        ev->ind_cfm_flag = 0;
+        llc_sap_next_state(sap, skb);
+        if (ev->ind_cfm_flag == LLC_IND) {
+                if (skb->sk->sk_state == TCP_LISTEN)
+                        kfree_skb(skb);
+                else {
+                        llc_save_primitive(skb, ev->prim);
+
+                        /* queue skb to the user. */
+                        if (sock_queue_rcv_skb(skb->sk, skb))
+                                kfree_skb(skb);
+                }
+        } 
+        kfree_skb(skb);
+}
+
+/**
+ *      llc_build_and_send_test_pkt - TEST interface for upper layers.
+ *      @sap: sap to use
+ *      @skb: packet to send
+ *      @dmac: destination mac address
+ *      @dsap: destination sap
+ *
+ *      This function is called when upper layer wants to send a TEST pdu.
+ *      Returns 0 for success, 1 otherwise.
+ */
+void llc_build_and_send_test_pkt(struct llc_sap *sap, 
+                                 struct sk_buff *skb, u8 *dmac, u8 dsap)
+{
+        struct llc_sap_state_ev *ev = llc_sap_ev(skb);
+
+        ev->saddr.lsap = sap->laddr.lsap;
+        ev->daddr.lsap = dsap;
+        memcpy(ev->saddr.mac, skb->dev->dev_addr, IFHWADDRLEN);
+        memcpy(ev->daddr.mac, dmac, IFHWADDRLEN);
+        
+        ev->type      = LLC_SAP_EV_TYPE_PRIM;
+        ev->prim      = LLC_TEST_PRIM;
+        ev->prim_type = LLC_PRIM_TYPE_REQ;
+        llc_sap_state_process(sap, skb);
+}
+
+/**
+ *      llc_build_and_send_xid_pkt - XID interface for upper layers
+ *      @sap: sap to use
+ *      @skb: packet to send
+ *      @dmac: destination mac address
+ *      @dsap: destination sap
+ *
+ *      This function is called when upper layer wants to send a XID pdu.
+ *      Returns 0 for success, 1 otherwise.
+ */
+void llc_build_and_send_xid_pkt(struct llc_sap *sap, struct sk_buff *skb,
+                                u8 *dmac, u8 dsap)
+{
+        struct llc_sap_state_ev *ev = llc_sap_ev(skb);
+
+        ev->saddr.lsap = sap->laddr.lsap;
+        ev->daddr.lsap = dsap;
+        memcpy(ev->saddr.mac, skb->dev->dev_addr, IFHWADDRLEN);
+        memcpy(ev->daddr.mac, dmac, IFHWADDRLEN);
+
+        ev->type      = LLC_SAP_EV_TYPE_PRIM;
+        ev->prim      = LLC_XID_PRIM;
+        ev->prim_type = LLC_PRIM_TYPE_REQ;
+        llc_sap_state_process(sap, skb);
+}
+
+/**
+ *      llc_sap_rcv - sends received pdus to the sap state machine
+ *      @sap: current sap component structure.
+ *      @skb: received frame.
+ *
+ *      Sends received pdus to the sap state machine.
+ */
+static void llc_sap_rcv(struct llc_sap *sap, struct sk_buff *skb)
+{
+        struct llc_sap_state_ev *ev = llc_sap_ev(skb);
+
+        ev->type   = LLC_SAP_EV_TYPE_PDU;
+        ev->reason = 0;
+        llc_sap_state_process(sap, skb);
+}
+
+/**
+ *      llc_lookup_dgram - Finds dgram socket for the local sap/mac
+ *      @sap: SAP
+ *      @laddr: address of local LLC (MAC + SAP)
+ *
+ *      Search socket list of the SAP and finds connection using the local
+ *      mac, and local sap. Returns pointer for socket found, %NULL otherwise.
+ */
+static struct sock *llc_lookup_dgram(struct llc_sap *sap,
+                                     struct llc_addr *laddr)
+{
+        struct sock *rc;
+        struct hlist_node *node;
+
+        read_lock_bh(&sap->sk_list.lock);
+        sk_for_each(rc, node, &sap->sk_list.list) {
+                struct llc_sock *llc = llc_sk(rc);
+
+                if (rc->sk_type == SOCK_DGRAM &&
+                    llc->laddr.lsap == laddr->lsap &&
+                    llc_mac_match(llc->laddr.mac, laddr->mac)) {
+                        sock_hold(rc);
+                        goto found;
+                }
+        }
+        rc = NULL;
+found:
+        read_unlock_bh(&sap->sk_list.lock);
+        return rc;
+}
+
+void llc_sap_handler(struct llc_sap *sap, struct sk_buff *skb)
+{
+        struct llc_addr laddr;
+        struct sock *sk;
+
+        llc_pdu_decode_da(skb, laddr.mac);
+        llc_pdu_decode_dsap(skb, &laddr.lsap);
+
+        sk = llc_lookup_dgram(sap, &laddr);
+        if (sk) {
+                skb->sk = sk;
+                llc_sap_rcv(sap, skb);
+                sock_put(sk);
+        } else
+                kfree_skb(skb);
+}