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Linux/net/dsa/tag_trailer.c

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  1 /*
  2  * net/dsa/tag_trailer.c - Trailer tag format handling
  3  * Copyright (c) 2008-2009 Marvell Semiconductor
  4  *
  5  * This program is free software; you can redistribute it and/or modify
  6  * it under the terms of the GNU General Public License as published by
  7  * the Free Software Foundation; either version 2 of the License, or
  8  * (at your option) any later version.
  9  */
 10 
 11 #include <linux/etherdevice.h>
 12 #include <linux/list.h>
 13 #include <linux/slab.h>
 14 #include "dsa_priv.h"
 15 
 16 static struct sk_buff *trailer_xmit(struct sk_buff *skb, struct net_device *dev)
 17 {
 18         struct dsa_slave_priv *p = netdev_priv(dev);
 19         struct sk_buff *nskb;
 20         int padlen;
 21         u8 *trailer;
 22 
 23         /*
 24          * We have to make sure that the trailer ends up as the very
 25          * last 4 bytes of the packet.  This means that we have to pad
 26          * the packet to the minimum ethernet frame size, if necessary,
 27          * before adding the trailer.
 28          */
 29         padlen = 0;
 30         if (skb->len < 60)
 31                 padlen = 60 - skb->len;
 32 
 33         nskb = alloc_skb(NET_IP_ALIGN + skb->len + padlen + 4, GFP_ATOMIC);
 34         if (nskb == NULL) {
 35                 kfree_skb(skb);
 36                 return NULL;
 37         }
 38         skb_reserve(nskb, NET_IP_ALIGN);
 39 
 40         skb_reset_mac_header(nskb);
 41         skb_set_network_header(nskb, skb_network_header(skb) - skb->head);
 42         skb_set_transport_header(nskb, skb_transport_header(skb) - skb->head);
 43         skb_copy_and_csum_dev(skb, skb_put(nskb, skb->len));
 44         kfree_skb(skb);
 45 
 46         if (padlen) {
 47                 u8 *pad = skb_put(nskb, padlen);
 48                 memset(pad, 0, padlen);
 49         }
 50 
 51         trailer = skb_put(nskb, 4);
 52         trailer[0] = 0x80;
 53         trailer[1] = 1 << p->port;
 54         trailer[2] = 0x10;
 55         trailer[3] = 0x00;
 56 
 57         return nskb;
 58 }
 59 
 60 static int trailer_rcv(struct sk_buff *skb, struct net_device *dev,
 61                        struct packet_type *pt, struct net_device *orig_dev)
 62 {
 63         struct dsa_switch_tree *dst = dev->dsa_ptr;
 64         struct dsa_switch *ds;
 65         u8 *trailer;
 66         int source_port;
 67 
 68         if (unlikely(dst == NULL))
 69                 goto out_drop;
 70         ds = dst->ds[0];
 71 
 72         skb = skb_unshare(skb, GFP_ATOMIC);
 73         if (skb == NULL)
 74                 goto out;
 75 
 76         if (skb_linearize(skb))
 77                 goto out_drop;
 78 
 79         trailer = skb_tail_pointer(skb) - 4;
 80         if (trailer[0] != 0x80 || (trailer[1] & 0xf8) != 0x00 ||
 81             (trailer[2] & 0xef) != 0x00 || trailer[3] != 0x00)
 82                 goto out_drop;
 83 
 84         source_port = trailer[1] & 7;
 85         if (source_port >= DSA_MAX_PORTS || !ds->ports[source_port].netdev)
 86                 goto out_drop;
 87 
 88         pskb_trim_rcsum(skb, skb->len - 4);
 89 
 90         skb->dev = ds->ports[source_port].netdev;
 91         skb_push(skb, ETH_HLEN);
 92         skb->pkt_type = PACKET_HOST;
 93         skb->protocol = eth_type_trans(skb, skb->dev);
 94 
 95         skb->dev->stats.rx_packets++;
 96         skb->dev->stats.rx_bytes += skb->len;
 97 
 98         netif_receive_skb(skb);
 99 
100         return 0;
101 
102 out_drop:
103         kfree_skb(skb);
104 out:
105         return 0;
106 }
107 
108 const struct dsa_device_ops trailer_netdev_ops = {
109         .xmit   = trailer_xmit,
110         .rcv    = trailer_rcv,
111 };
112 

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