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linux/net/llc/llc_sap.c
Octavian Purdila 52d58aef5e llc: replace the socket list with a local address based hash 
For the cases where a lot of interfaces are used in conjunction with a
lot of LLC sockets bound to the same SAP, the iteration of the socket
list becomes prohibitively expensive.

Replacing the list with a a local address based hash significantly
improves the bind and listener lookup operations as well as the
datagram delivery.

Connected sockets delivery is also improved, but this patch does not
address the case where we have lots of sockets with the same local
address connected to different remote addresses.

In order to keep the socket sanity checks alive and fast a socket
counter was added to the SAP structure.

Signed-off-by: Octavian Purdila <opurdila@ixiacom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-12-26 20:45:32 -08:00

444 lines
11 KiB
C
Raw Blame History

/*
* 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 <net/tcp_states.h>
#include <linux/llc.h>
static int llc_mac_header_len(unsigned short devtype)
{
switch (devtype) {
case ARPHRD_ETHER:
case ARPHRD_LOOPBACK:
return sizeof(struct ethhdr);
#ifdef CONFIG_TR
case ARPHRD_IEEE802_TR:
return sizeof(struct trh_hdr);
#endif
}
return 0;
}
/**
* llc_alloc_frame - allocates sk_buff for frame
* @dev: network device this skb will be sent over
* @type: pdu type to allocate
* @data_size: data size to allocate
*
* 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(struct sock *sk, struct net_device *dev,
u8 type, u32 data_size)
{
int hlen = type == LLC_PDU_TYPE_U ? 3 : 4;
struct sk_buff *skb;
hlen += llc_mac_header_len(dev->type);
skb = alloc_skb(hlen + data_size, GFP_ATOMIC);
if (skb) {
skb_reset_mac_header(skb);
skb_reserve(skb, hlen);
skb_reset_network_header(skb);
skb_reset_transport_header(skb);
skb->protocol = htons(ETH_P_802_2);
skb->dev = dev;
if (sk != NULL)
skb_set_owner_w(skb, sk);
}
return skb;
}
void llc_save_primitive(struct sock *sk, struct sk_buff* skb, u8 prim)
{
struct sockaddr_llc *addr;
/* save primitive for use by the user. */
addr = llc_ui_skb_cb(skb);
memset(addr, 0, sizeof(*addr));
addr->sllc_family = 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->sk, 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 sock *sk)
{
struct llc_sap_state_ev *ev = llc_sap_ev(skb);
ev->type = LLC_SAP_EV_TYPE_PDU;
ev->reason = 0;
skb->sk = sk;
llc_sap_state_process(sap, skb);
}
static inline bool llc_dgram_match(const struct llc_sap *sap,
const struct llc_addr *laddr,
const struct sock *sk)
{
struct llc_sock *llc = llc_sk(sk);
return sk->sk_type == SOCK_DGRAM &&
llc->laddr.lsap == laddr->lsap &&
llc_mac_match(llc->laddr.mac, laddr->mac);
}
/**
* 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,
const struct llc_addr *laddr)
{
struct sock *rc;
struct hlist_nulls_node *node;
int slot = llc_sk_laddr_hashfn(sap, laddr);
struct hlist_nulls_head *laddr_hb = &sap->sk_laddr_hash[slot];
rcu_read_lock_bh();
again:
sk_nulls_for_each_rcu(rc, node, laddr_hb) {
if (llc_dgram_match(sap, laddr, rc)) {
/* Extra checks required by SLAB_DESTROY_BY_RCU */
if (unlikely(!atomic_inc_not_zero(&rc->sk_refcnt)))
goto again;
if (unlikely(llc_sk(rc)->sap != sap ||
!llc_dgram_match(sap, laddr, rc))) {
sock_put(rc);
continue;
}
goto found;
}
}
rc = NULL;
/*
* if the nulls value we got at the end of this lookup is
* not the expected one, we must restart lookup.
* We probably met an item that was moved to another chain.
*/
if (unlikely(get_nulls_value(node) != slot))
goto again;
found:
rcu_read_unlock_bh();
return rc;
}
static inline bool llc_mcast_match(const struct llc_sap *sap,
const struct llc_addr *laddr,
const struct sk_buff *skb,
const struct sock *sk)
{
struct llc_sock *llc = llc_sk(sk);
return sk->sk_type == SOCK_DGRAM &&
llc->laddr.lsap == laddr->lsap &&
llc->dev == skb->dev;
}
static void llc_do_mcast(struct llc_sap *sap, struct sk_buff *skb,
struct sock **stack, int count)
{
struct sk_buff *skb1;
int i;
for (i = 0; i < count; i++) {
skb1 = skb_clone(skb, GFP_ATOMIC);
if (!skb1) {
sock_put(stack[i]);
continue;
}
llc_sap_rcv(sap, skb1, stack[i]);
sock_put(stack[i]);
}
}
/**
* llc_sap_mcast - Deliver multicast PDU's to all matching datagram sockets.
* @sap: SAP
* @laddr: address of local LLC (MAC + SAP)
*
* Search socket list of the SAP and finds connections with same sap.
* Deliver clone to each.
*/
static void llc_sap_mcast(struct llc_sap *sap,
const struct llc_addr *laddr,
struct sk_buff *skb)
{
int i = 0, count = 256 / sizeof(struct sock *);
struct sock *sk, *stack[count];
struct hlist_node *node;
struct llc_sock *llc;
struct hlist_head *dev_hb = llc_sk_dev_hash(sap, skb->dev->ifindex);
spin_lock_bh(&sap->sk_lock);
hlist_for_each_entry(llc, node, dev_hb, dev_hash_node) {
sk = &llc->sk;
if (!llc_mcast_match(sap, laddr, skb, sk))
continue;
sock_hold(sk);
if (i < count)
stack[i++] = sk;
else {
llc_do_mcast(sap, skb, stack, i);
i = 0;
}
}
spin_unlock_bh(&sap->sk_lock);
llc_do_mcast(sap, skb, stack, i);
}
void llc_sap_handler(struct llc_sap *sap, struct sk_buff *skb)
{
struct llc_addr laddr;
llc_pdu_decode_da(skb, laddr.mac);
llc_pdu_decode_dsap(skb, &laddr.lsap);
if (llc_mac_multicast(laddr.mac)) {
llc_sap_mcast(sap, &laddr, skb);
kfree_skb(skb);
} else {
struct sock *sk = llc_lookup_dgram(sap, &laddr);
if (sk) {
llc_sap_rcv(sap, skb, sk);
sock_put(sk);
} else
kfree_skb(skb);
}
}
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