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-rw-r--r--net/ipv4/packet.c528
1 files changed, 0 insertions, 528 deletions
diff --git a/net/ipv4/packet.c b/net/ipv4/packet.c
index f69449e76..e69de29bb 100644
--- a/net/ipv4/packet.c
+++ b/net/ipv4/packet.c
@@ -1,528 +0,0 @@
-/*
- * INET An implementation of the TCP/IP protocol suite for the LINUX
- * operating system. INET is implemented using the BSD Socket
- * interface as the means of communication with the user level.
- *
- * PACKET - implements raw packet sockets.
- *
- * Doesn't belong in IP but it's currently too hooked into ip
- * to separate.
- *
- * Version: @(#)packet.c 1.0.6 05/25/93
- *
- * Authors: Ross Biro, <bir7@leland.Stanford.Edu>
- * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
- * Alan Cox, <gw4pts@gw4pts.ampr.org>
- *
- * Fixes:
- * Alan Cox : verify_area() now used correctly
- * Alan Cox : new skbuff lists, look ma no backlogs!
- * Alan Cox : tidied skbuff lists.
- * Alan Cox : Now uses generic datagram routines I
- * added. Also fixed the peek/read crash
- * from all old Linux datagram code.
- * Alan Cox : Uses the improved datagram code.
- * Alan Cox : Added NULL's for socket options.
- * Alan Cox : Re-commented the code.
- * Alan Cox : Use new kernel side addressing
- * Rob Janssen : Correct MTU usage.
- * Dave Platt : Counter leaks caused by incorrect
- * interrupt locking and some slightly
- * dubious gcc output. Can you read
- * compiler: it said _VOLATILE_
- * Richard Kooijman : Timestamp fixes.
- * Alan Cox : New buffers. Use sk->mac.raw.
- * Alan Cox : sendmsg/recvmsg support.
- * Alan Cox : Protocol setting support
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- *
- */
-
-#include <linux/types.h>
-#include <linux/sched.h>
-#include <linux/mm.h>
-#include <linux/fcntl.h>
-#include <linux/socket.h>
-#include <linux/in.h>
-#include <linux/inet.h>
-#include <linux/netdevice.h>
-#include <linux/if_packet.h>
-#include <net/ip.h>
-#include <net/protocol.h>
-#include <linux/skbuff.h>
-#include <net/sock.h>
-#include <linux/errno.h>
-#include <linux/timer.h>
-#include <asm/system.h>
-#include <asm/uaccess.h>
-
-
-/*
- * This should be the easiest of all, all we do is copy it into a buffer.
- */
-
-int packet_rcv(struct sk_buff *skb, struct device *dev, struct packet_type *pt)
-{
- struct sock *sk;
-
- /*
- * When we registered the protocol we saved the socket in the data
- * field for just this event.
- */
-
- sk = (struct sock *) pt->data;
-
- /*
- * Yank back the headers [hope the device set this
- * right or kerboom...]
- */
-
- skb_push(skb,skb->data-skb->mac.raw);
-
- /*
- * The SOCK_PACKET socket receives _all_ frames.
- */
-
- skb->dev = dev;
-
- /*
- * Charge the memory to the socket. This is done specifically
- * to prevent sockets using all the memory up.
- */
-
- if(sock_queue_rcv_skb(sk,skb)<0)
- {
- kfree_skb(skb, FREE_READ);
- return 0;
- }
- /*
- * Processing complete.
- */
-
- return(0);
-}
-
-
-/*
- * Output a raw packet to a device layer. This bypasses all the other
- * protocol layers and you must therefore supply it with a complete frame
- */
-
-static int packet_sendmsg(struct sock *sk, struct msghdr *msg, int len)
-{
- struct sk_buff *skb;
- struct device *dev;
- struct sockaddr_pkt *saddr=(struct sockaddr_pkt *)msg->msg_name;
- unsigned short proto=0;
- int err;
-
- /*
- * Check the flags.
- */
-
- if (msg->msg_flags&~MSG_DONTWAIT)
- return(-EINVAL);
-
- /*
- * Get and verify the address.
- */
-
- if (saddr)
- {
- if (msg->msg_namelen < sizeof(struct sockaddr))
- return(-EINVAL);
- if (msg->msg_namelen==sizeof(struct sockaddr_pkt))
- proto=saddr->spkt_protocol;
- }
- else
- return(-ENOTCONN); /* SOCK_PACKET must be sent giving an address */
-
- /*
- * Find the device first to size check it
- */
-
- saddr->spkt_device[13] = 0;
- dev = dev_get(saddr->spkt_device);
- if (dev == NULL)
- {
- return(-ENODEV);
- }
-
- /*
- * You may not queue a frame bigger than the mtu. This is the lowest level
- * raw protocol and you must do your own fragmentation at this level.
- */
-
- if(len>dev->mtu+dev->hard_header_len)
- return -EMSGSIZE;
-
- skb = sock_wmalloc(sk, len+dev->hard_header_len, 0, GFP_KERNEL);
-
- /*
- * If the write buffer is full, then tough. At this level the user gets to
- * deal with the problem - do your own algorithmic backoffs. That's far
- * more flexible.
- */
-
- if (skb == NULL)
- {
- return(-ENOBUFS);
- }
-
- /*
- * Fill it in
- */
-
- /* FIXME: Save some space for broken drivers that write a
- * hard header at transmission time by themselves. PPP is the
- * notable one here. This should really be fixed at the driver level.
- */
- skb_reserve(skb,dev->hard_header_len);
- err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len);
- skb->arp = 1; /* No ARP needs doing on this (complete) frame */
- skb->protocol = proto;
- skb->dev = dev;
- skb->priority = sk->priority;
-
- /*
- * Now send it
- */
-
- if (err)
- {
- err = -EFAULT;
- }
- else
- {
- if (!(dev->flags & IFF_UP))
- {
- err = -ENODEV;
- }
- }
-
- if (err)
- {
- kfree_skb(skb, FREE_WRITE);
- return err;
- }
-
- dev_queue_xmit(skb);
- return(len);
-}
-
-/*
- * Close a SOCK_PACKET socket. This is fairly simple. We immediately go
- * to 'closed' state and remove our protocol entry in the device list.
- * The release_sock() will destroy the socket if a user has closed the
- * file side of the object.
- */
-
-static void packet_close(struct sock *sk, unsigned long timeout)
-{
- /*
- * Stop more data and kill the socket off.
- */
-
- lock_sock(sk);
- sk->state = TCP_CLOSE;
-
- /*
- * Unhook the notifier
- */
-
- unregister_netdevice_notifier(&sk->protinfo.af_packet.notifier);
-
- if(sk->protinfo.af_packet.prot_hook)
- {
- /*
- * Remove the protocol hook
- */
-
- dev_remove_pack((struct packet_type *)sk->protinfo.af_packet.prot_hook);
-
- /*
- * Dispose of litter carefully.
- */
-
- kfree_s((void *)sk->protinfo.af_packet.prot_hook, sizeof(struct packet_type));
- sk->protinfo.af_packet.prot_hook = NULL;
- }
-
- release_sock(sk);
- sk->dead = 1;
- destroy_sock(sk);
-}
-
-/*
- * Attach a packet hook to a device.
- */
-
-int packet_attach(struct sock *sk, struct device *dev)
-{
- struct packet_type *p = (struct packet_type *) kmalloc(sizeof(*p), GFP_KERNEL);
- if (p == NULL)
- return(-ENOMEM);
-
- p->func = packet_rcv;
- p->type = sk->num;
- p->data = (void *)sk;
- p->dev = dev;
- dev_add_pack(p);
-
- /*
- * We need to remember this somewhere.
- */
-
- sk->protinfo.af_packet.prot_hook = p;
- sk->protinfo.af_packet.bound_dev = dev;
- return 0;
-}
-
-/*
- * Bind a packet socket to a device
- */
-
-static int packet_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
-{
- char name[15];
- struct device *dev;
-
- /*
- * Check legality
- */
-
- if(addr_len!=sizeof(struct sockaddr))
- return -EINVAL;
- strncpy(name,uaddr->sa_data,14);
- name[14]=0;
-
- /*
- * Lock the device chain while we sanity check
- * the bind request.
- */
-
- dev_lock_list();
- dev=dev_get(name);
- if(dev==NULL)
- {
- dev_unlock_list();
- return -ENODEV;
- }
-
- if(!(dev->flags&IFF_UP))
- {
- dev_unlock_list();
- return -ENETDOWN;
- }
-
- /*
- * Perform the request.
- */
-
- memcpy(sk->protinfo.af_packet.device_name,name,15);
-
- /*
- * Rewrite an existing hook if present.
- */
-
- if(sk->protinfo.af_packet.prot_hook)
- {
- dev_remove_pack(sk->protinfo.af_packet.prot_hook);
- sk->protinfo.af_packet.prot_hook->dev=dev;
- sk->protinfo.af_packet.bound_dev=dev;
- dev_add_pack(sk->protinfo.af_packet.prot_hook);
- }
- else
- {
- int err=packet_attach(sk, dev);
- if(err)
- {
- dev_unlock_list();
- return err;
- }
- }
- /*
- * Now the notifier is set up right this lot is safe.
- */
- dev_unlock_list();
- return 0;
-}
-
-/*
- * This hook is called when a device goes up or down so that
- * SOCK_PACKET sockets can come unbound properly.
- */
-
-static int packet_unbind(struct notifier_block *this, unsigned long msg, void *data)
-{
- struct inet_packet_opt *ipo=(struct inet_packet_opt *)this;
- if(msg==NETDEV_DOWN && data==ipo->bound_dev)
- {
- /*
- * Our device has gone down.
- */
- ipo->bound_dev=NULL;
- dev_remove_pack(ipo->prot_hook);
- kfree(ipo->prot_hook);
- ipo->prot_hook=NULL;
- }
- return NOTIFY_DONE;
-}
-
-
-/*
- * Create a packet of type SOCK_PACKET.
- */
-
-static int packet_init(struct sock *sk)
-{
- /*
- * Attach a protocol block
- */
-
- int err=packet_attach(sk, NULL);
- if(err)
- return err;
-
- /*
- * Set up the per socket notifier.
- */
-
- sk->protinfo.af_packet.notifier.notifier_call=packet_unbind;
- sk->protinfo.af_packet.notifier.priority=0;
-
- register_netdevice_notifier(&sk->protinfo.af_packet.notifier);
-
- return(0);
-}
-
-
-/*
- * Pull a packet from our receive queue and hand it to the user.
- * If necessary we block.
- */
-
-int packet_recvmsg(struct sock *sk, struct msghdr *msg, int len,
- int noblock, int flags,int *addr_len)
-{
- int copied=0;
- struct sk_buff *skb;
- struct sockaddr_pkt *saddr=(struct sockaddr_pkt *)msg->msg_name;
- int err;
-
- /*
- * If there is no protocol hook then the device is down.
- */
-
- if(sk->protinfo.af_packet.prot_hook==NULL)
- return -ENETDOWN;
-
- /*
- * If the address length field is there to be filled in, we fill
- * it in now.
- */
-
- if (addr_len)
- *addr_len=sizeof(*saddr);
-
- /*
- * Call the generic datagram receiver. This handles all sorts
- * of horrible races and re-entrancy so we can forget about it
- * in the protocol layers.
- */
-
- skb=skb_recv_datagram(sk,flags,noblock,&err);
-
- /*
- * An error occurred so return it. Because skb_recv_datagram()
- * handles the blocking we don't see and worry about blocking
- * retries.
- */
-
- if(skb==NULL)
- return err;
-
- /*
- * You lose any data beyond the buffer you gave. If it worries a
- * user program they can ask the device for its MTU anyway.
- */
-
- copied = skb->len;
- if(copied>len)
- {
- copied=len;
- msg->msg_flags|=MSG_TRUNC;
- }
-
- /* We can't use skb_copy_datagram here */
- err = memcpy_toiovec(msg->msg_iov, skb->data, copied);
- if (err)
- {
- return -EFAULT;
- }
-
- sk->stamp=skb->stamp;
-
- /*
- * Copy the address.
- */
-
- if (saddr)
- {
- saddr->spkt_family = skb->dev->type;
- strncpy(saddr->spkt_device,skb->dev->name, 15);
- saddr->spkt_protocol = skb->protocol;
- }
-
- /*
- * Free or return the buffer as appropriate. Again this hides all the
- * races and re-entrancy issues from us.
- */
-
- skb_free_datagram(sk, skb);
-
- return(copied);
-}
-
-/*
- * This structure declares to the lower layer socket subsystem currently
- * incorrectly embedded in the IP code how to behave. This interface needs
- * a lot of work and will change.
- */
-
-struct proto packet_prot =
-{
- (struct sock *)&packet_prot, /* sklist_next */
- (struct sock *)&packet_prot, /* sklist_prev */
- packet_close, /* close */
- NULL, /* connect */
- NULL, /* accept */
- NULL, /* retransmit */
- NULL, /* write_wakeup */
- NULL, /* read_wakeup */
- datagram_poll, /* poll */
- NULL, /* ioctl */
- packet_init, /* init */
- NULL, /* destroy */
- NULL, /* shutdown */
- NULL, /* setsockopt */
- NULL, /* getsockopt */
- packet_sendmsg, /* Sendmsg */
- packet_recvmsg, /* Recvmsg */
- packet_bind, /* bind */
- NULL, /* backlog_rcv */
- NULL, /* hash */
- NULL, /* unhash */
- NULL, /* rehash */
- NULL, /* good_socknum */
- NULL, /* verify_bind */
- 128, /* max_header */
- 0, /* retransmits */
- "PACKET", /* name */
- 0, /* inuse */
- 0 /* highestinuse */
-};
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