Commit | Line | Data |
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7750f403 PM |
1 | #include <linux/skbuff.h> |
2 | #include <linux/netdevice.h> | |
3 | #include <linux/if_vlan.h> | |
4ead4431 | 4 | #include <linux/netpoll.h> |
bc3b2d7f | 5 | #include <linux/export.h> |
7750f403 PM |
6 | #include "vlan.h" |
7 | ||
bcc6d479 | 8 | bool vlan_do_receive(struct sk_buff **skbp) |
7750f403 | 9 | { |
3701e513 JG |
10 | struct sk_buff *skb = *skbp; |
11 | u16 vlan_id = skb->vlan_tci & VLAN_VID_MASK; | |
ad1afb00 | 12 | struct net_device *vlan_dev; |
4af429d2 | 13 | struct vlan_pcpu_stats *rx_stats; |
7750f403 | 14 | |
3701e513 JG |
15 | vlan_dev = vlan_find_dev(skb->dev, vlan_id); |
16 | if (!vlan_dev) { | |
17 | if (vlan_id) | |
18 | skb->pkt_type = PACKET_OTHERHOST; | |
19 | return false; | |
173e79fb | 20 | } |
9b22ea56 | 21 | |
3701e513 JG |
22 | skb = *skbp = skb_share_check(skb, GFP_ATOMIC); |
23 | if (unlikely(!skb)) | |
24 | return false; | |
e1c096e2 | 25 | |
3701e513 | 26 | skb->dev = vlan_dev; |
0b5c9db1 JP |
27 | if (skb->pkt_type == PACKET_OTHERHOST) { |
28 | /* Our lower layer thinks this is not local, let's make sure. | |
29 | * This allows the VLAN to have a different MAC than the | |
30 | * underlying device, and still route correctly. */ | |
31 | if (!compare_ether_addr(eth_hdr(skb)->h_dest, | |
32 | vlan_dev->dev_addr)) | |
33 | skb->pkt_type = PACKET_HOST; | |
34 | } | |
35 | ||
36 | if (!(vlan_dev_info(vlan_dev)->flags & VLAN_FLAG_REORDER_HDR)) { | |
37 | unsigned int offset = skb->data - skb_mac_header(skb); | |
38 | ||
39 | /* | |
40 | * vlan_insert_tag expect skb->data pointing to mac header. | |
41 | * So change skb->data before calling it and change back to | |
42 | * original position later | |
43 | */ | |
44 | skb_push(skb, offset); | |
45 | skb = *skbp = vlan_insert_tag(skb, skb->vlan_tci); | |
46 | if (!skb) | |
47 | return false; | |
48 | skb_pull(skb, offset + VLAN_HLEN); | |
49 | skb_reset_mac_len(skb); | |
50 | } | |
51 | ||
3701e513 | 52 | skb->priority = vlan_get_ingress_priority(vlan_dev, skb->vlan_tci); |
bc1d0411 | 53 | skb->vlan_tci = 0; |
7750f403 | 54 | |
4af429d2 | 55 | rx_stats = this_cpu_ptr(vlan_dev_info(vlan_dev)->vlan_pcpu_stats); |
9793241f | 56 | |
9618e2ff | 57 | u64_stats_update_begin(&rx_stats->syncp); |
9793241f ED |
58 | rx_stats->rx_packets++; |
59 | rx_stats->rx_bytes += skb->len; | |
0b5c9db1 | 60 | if (skb->pkt_type == PACKET_MULTICAST) |
9618e2ff | 61 | rx_stats->rx_multicast++; |
9618e2ff | 62 | u64_stats_update_end(&rx_stats->syncp); |
3701e513 JG |
63 | |
64 | return true; | |
7750f403 | 65 | } |
22d1ba74 | 66 | |
cec9c133 JP |
67 | /* Must be invoked with rcu_read_lock or with RTNL. */ |
68 | struct net_device *__vlan_find_dev_deep(struct net_device *real_dev, | |
69 | u16 vlan_id) | |
70 | { | |
71 | struct vlan_group *grp = rcu_dereference_rtnl(real_dev->vlgrp); | |
72 | ||
73 | if (grp) { | |
74 | return vlan_group_get_device(grp, vlan_id); | |
75 | } else { | |
76 | /* | |
77 | * Bonding slaves do not have grp assigned to themselves. | |
78 | * Grp is assigned to bonding master instead. | |
79 | */ | |
80 | if (netif_is_bond_slave(real_dev)) | |
81 | return __vlan_find_dev_deep(real_dev->master, vlan_id); | |
82 | } | |
83 | ||
84 | return NULL; | |
85 | } | |
86 | EXPORT_SYMBOL(__vlan_find_dev_deep); | |
87 | ||
22d1ba74 PM |
88 | struct net_device *vlan_dev_real_dev(const struct net_device *dev) |
89 | { | |
90 | return vlan_dev_info(dev)->real_dev; | |
91 | } | |
116cb428 | 92 | EXPORT_SYMBOL(vlan_dev_real_dev); |
22d1ba74 PM |
93 | |
94 | u16 vlan_dev_vlan_id(const struct net_device *dev) | |
95 | { | |
96 | return vlan_dev_info(dev)->vlan_id; | |
97 | } | |
116cb428 | 98 | EXPORT_SYMBOL(vlan_dev_vlan_id); |
e1c096e2 | 99 | |
0b5c9db1 | 100 | static struct sk_buff *vlan_reorder_header(struct sk_buff *skb) |
bcc6d479 | 101 | { |
0b5c9db1 JP |
102 | if (skb_cow(skb, skb_headroom(skb)) < 0) |
103 | return NULL; | |
104 | memmove(skb->data - ETH_HLEN, skb->data - VLAN_ETH_HLEN, 2 * ETH_ALEN); | |
105 | skb->mac_header += VLAN_HLEN; | |
106 | skb_reset_mac_len(skb); | |
bcc6d479 JP |
107 | return skb; |
108 | } | |
109 | ||
110 | static void vlan_set_encap_proto(struct sk_buff *skb, struct vlan_hdr *vhdr) | |
111 | { | |
112 | __be16 proto; | |
113 | unsigned char *rawp; | |
114 | ||
115 | /* | |
116 | * Was a VLAN packet, grab the encapsulated protocol, which the layer | |
117 | * three protocols care about. | |
118 | */ | |
119 | ||
120 | proto = vhdr->h_vlan_encapsulated_proto; | |
121 | if (ntohs(proto) >= 1536) { | |
122 | skb->protocol = proto; | |
123 | return; | |
124 | } | |
125 | ||
126 | rawp = skb->data; | |
127 | if (*(unsigned short *) rawp == 0xFFFF) | |
128 | /* | |
129 | * This is a magic hack to spot IPX packets. Older Novell | |
130 | * breaks the protocol design and runs IPX over 802.3 without | |
131 | * an 802.2 LLC layer. We look for FFFF which isn't a used | |
132 | * 802.2 SSAP/DSAP. This won't work for fault tolerant netware | |
133 | * but does for the rest. | |
134 | */ | |
135 | skb->protocol = htons(ETH_P_802_3); | |
136 | else | |
137 | /* | |
138 | * Real 802.2 LLC | |
139 | */ | |
140 | skb->protocol = htons(ETH_P_802_2); | |
141 | } | |
142 | ||
143 | struct sk_buff *vlan_untag(struct sk_buff *skb) | |
144 | { | |
145 | struct vlan_hdr *vhdr; | |
146 | u16 vlan_tci; | |
147 | ||
148 | if (unlikely(vlan_tx_tag_present(skb))) { | |
149 | /* vlan_tci is already set-up so leave this for another time */ | |
150 | return skb; | |
151 | } | |
152 | ||
153 | skb = skb_share_check(skb, GFP_ATOMIC); | |
154 | if (unlikely(!skb)) | |
155 | goto err_free; | |
156 | ||
157 | if (unlikely(!pskb_may_pull(skb, VLAN_HLEN))) | |
158 | goto err_free; | |
159 | ||
160 | vhdr = (struct vlan_hdr *) skb->data; | |
161 | vlan_tci = ntohs(vhdr->h_vlan_TCI); | |
162 | __vlan_hwaccel_put_tag(skb, vlan_tci); | |
163 | ||
164 | skb_pull_rcsum(skb, VLAN_HLEN); | |
165 | vlan_set_encap_proto(skb, vhdr); | |
166 | ||
0b5c9db1 | 167 | skb = vlan_reorder_header(skb); |
bcc6d479 JP |
168 | if (unlikely(!skb)) |
169 | goto err_free; | |
170 | ||
c5114cd5 JP |
171 | skb_reset_network_header(skb); |
172 | skb_reset_transport_header(skb); | |
bcc6d479 JP |
173 | return skb; |
174 | ||
175 | err_free: | |
176 | kfree_skb(skb); | |
177 | return NULL; | |
178 | } |