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1 | /* |
2 | * STP SAP demux |
3 | * |
4 | * Copyright (c) 2008 Patrick McHardy <kaber@trash.net> |
5 | * |
6 | * This program is free software; you can redistribute it and/or |
7 | * modify it under the terms of the GNU General Public License |
8 | * version 2 as published by the Free Software Foundation. |
9 | */ |
10 | #include <linux/mutex.h> |
11 | #include <linux/skbuff.h> |
12 | #include <linux/etherdevice.h> |
13 | #include <linux/llc.h> |
14 | #include <net/llc.h> |
15 | #include <net/llc_pdu.h> |
16 | #include <net/stp.h> |
17 | |
18 | /* 01:80:c2:00:00:20 - 01:80:c2:00:00:2F */ |
19 | #define GARP_ADDR_MIN 0x20 |
20 | #define GARP_ADDR_MAX 0x2F |
21 | #define GARP_ADDR_RANGE (GARP_ADDR_MAX - GARP_ADDR_MIN) |
22 | |
23 | static const struct stp_proto *garp_protos[GARP_ADDR_RANGE + 1] __read_mostly; |
24 | static const struct stp_proto *stp_proto __read_mostly; |
25 | |
26 | static struct llc_sap *sap __read_mostly; |
27 | static unsigned int sap_registered; |
28 | static DEFINE_MUTEX(stp_proto_mutex); |
29 | |
30 | /* Called under rcu_read_lock from LLC */ |
31 | static int stp_pdu_rcv(struct sk_buff *skb, struct net_device *dev, |
32 | struct packet_type *pt, struct net_device *orig_dev) |
33 | { |
34 | const struct ethhdr *eh = eth_hdr(skb); |
35 | const struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb); |
36 | const struct stp_proto *proto; |
37 | |
38 | if (pdu->ssap != LLC_SAP_BSPAN || |
39 | pdu->dsap != LLC_SAP_BSPAN || |
40 | pdu->ctrl_1 != LLC_PDU_TYPE_U) |
41 | goto err; |
42 | |
43 | if (eh->h_dest[5] >= GARP_ADDR_MIN && eh->h_dest[5] <= GARP_ADDR_MAX) { |
44 | proto = rcu_dereference(garp_protos[eh->h_dest[5] - |
45 | GARP_ADDR_MIN]); |
46 | if (proto && |
47 | compare_ether_addr(eh->h_dest, proto->group_address)) |
48 | goto err; |
49 | } else |
50 | proto = rcu_dereference(stp_proto); |
51 | |
52 | if (!proto) |
53 | goto err; |
54 | |
55 | proto->rcv(proto, skb, dev); |
56 | return 0; |
57 | |
58 | err: |
59 | kfree_skb(skb); |
60 | return 0; |
61 | } |
62 | |
63 | int stp_proto_register(const struct stp_proto *proto) |
64 | { |
65 | int err = 0; |
66 | |
67 | mutex_lock(&stp_proto_mutex); |
68 | if (sap_registered++ == 0) { |
69 | sap = llc_sap_open(LLC_SAP_BSPAN, stp_pdu_rcv); |
70 | if (!sap) { |
71 | err = -ENOMEM; |
72 | goto out; |
73 | } |
74 | } |
75 | if (is_zero_ether_addr(proto->group_address)) |
76 | rcu_assign_pointer(stp_proto, proto); |
77 | else |
78 | rcu_assign_pointer(garp_protos[proto->group_address[5] - |
79 | GARP_ADDR_MIN], proto); |
80 | out: |
81 | mutex_unlock(&stp_proto_mutex); |
82 | return err; |
83 | } |
84 | EXPORT_SYMBOL_GPL(stp_proto_register); |
85 | |
86 | void stp_proto_unregister(const struct stp_proto *proto) |
87 | { |
88 | mutex_lock(&stp_proto_mutex); |
89 | if (is_zero_ether_addr(proto->group_address)) |
90 | rcu_assign_pointer(stp_proto, NULL); |
91 | else |
92 | rcu_assign_pointer(garp_protos[proto->group_address[5] - |
93 | GARP_ADDR_MIN], NULL); |
94 | synchronize_rcu(); |
95 | |
96 | if (--sap_registered == 0) |
97 | llc_sap_put(sap); |
98 | mutex_unlock(&stp_proto_mutex); |
99 | } |
100 | EXPORT_SYMBOL_GPL(stp_proto_unregister); |
101 | |
102 | MODULE_LICENSE("GPL"); |
103 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
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v3.9