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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 
 15 #include "dsa_priv.h"
 16 
 17 static struct sk_buff *trailer_xmit(struct sk_buff *skb, struct net_device *dev)
 18 {
 19         struct dsa_port *dp = dsa_slave_to_port(dev);
 20         struct sk_buff *nskb;
 21         int padlen;
 22         u8 *trailer;
 23 
 24         /*
 25          * We have to make sure that the trailer ends up as the very
 26          * last 4 bytes of the packet.  This means that we have to pad
 27          * the packet to the minimum ethernet frame size, if necessary,
 28          * before adding the trailer.
 29          */
 30         padlen = 0;
 31         if (skb->len < 60)
 32                 padlen = 60 - skb->len;
 33 
 34         nskb = alloc_skb(NET_IP_ALIGN + skb->len + padlen + 4, GFP_ATOMIC);
 35         if (!nskb)
 36                 return NULL;
 37         skb_reserve(nskb, NET_IP_ALIGN);
 38 
 39         skb_reset_mac_header(nskb);
 40         skb_set_network_header(nskb, skb_network_header(skb) - skb->head);
 41         skb_set_transport_header(nskb, skb_transport_header(skb) - skb->head);
 42         skb_copy_and_csum_dev(skb, skb_put(nskb, skb->len));
 43         consume_skb(skb);
 44 
 45         if (padlen) {
 46                 skb_put_zero(nskb, padlen);
 47         }
 48 
 49         trailer = skb_put(nskb, 4);
 50         trailer[0] = 0x80;
 51         trailer[1] = 1 << dp->index;
 52         trailer[2] = 0x10;
 53         trailer[3] = 0x00;
 54 
 55         return nskb;
 56 }
 57 
 58 static struct sk_buff *trailer_rcv(struct sk_buff *skb, struct net_device *dev,
 59                                    struct packet_type *pt)
 60 {
 61         u8 *trailer;
 62         int source_port;
 63 
 64         if (skb_linearize(skb))
 65                 return NULL;
 66 
 67         trailer = skb_tail_pointer(skb) - 4;
 68         if (trailer[0] != 0x80 || (trailer[1] & 0xf8) != 0x00 ||
 69             (trailer[2] & 0xef) != 0x00 || trailer[3] != 0x00)
 70                 return NULL;
 71 
 72         source_port = trailer[1] & 7;
 73 
 74         skb->dev = dsa_master_find_slave(dev, 0, source_port);
 75         if (!skb->dev)
 76                 return NULL;
 77 
 78         pskb_trim_rcsum(skb, skb->len - 4);
 79 
 80         return skb;
 81 }
 82 
 83 const struct dsa_device_ops trailer_netdev_ops = {
 84         .xmit   = trailer_xmit,
 85         .rcv    = trailer_rcv,
 86 };
 87 

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