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https://opencores.org/ocsvn/or1k/or1k/trunk
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/or1k/trunk/linux/linux-2.4/net/packet
- from Rev 1275 to Rev 1765
- ↔ Reverse comparison
Rev 1275 → Rev 1765
/Makefile
0,0 → 1,14
# |
# Makefile for the packet AF. |
# |
# Note! Dependencies are done automagically by 'make dep', which also |
# removes any old dependencies. DON'T put your own dependencies here |
# unless it's something special (ie not a .c file). |
# |
# Note 2! The CFLAGS definition is now in the main makefile... |
|
O_TARGET := packet.o |
|
obj-$(CONFIG_PACKET) += af_packet.o |
|
include $(TOPDIR)/Rules.make |
/af_packet.c
0,0 → 1,1921
/* |
* 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. |
* |
* Version: $Id: af_packet.c,v 1.1.1.1 2004-04-15 01:16:52 phoenix Exp $ |
* |
* 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 |
* Alexey Kuznetsov : Untied from IPv4 stack. |
* Cyrus Durgin : Fixed kerneld for kmod. |
* Michal Ostrowski : Module initialization cleanup. |
* Ulises Alonso : Frame number limit removal and |
* packet_set_ring memory leak. |
* |
* 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/config.h> |
#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 <linux/wireless.h> |
#include <linux/kmod.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> |
#include <asm/ioctls.h> |
#include <linux/proc_fs.h> |
#include <linux/poll.h> |
#include <linux/module.h> |
#include <linux/init.h> |
#include <linux/if_bridge.h> |
|
#ifdef CONFIG_NET_DIVERT |
#include <linux/divert.h> |
#endif /* CONFIG_NET_DIVERT */ |
|
#ifdef CONFIG_INET |
#include <net/inet_common.h> |
#endif |
|
#ifdef CONFIG_DLCI |
extern int dlci_ioctl(unsigned int, void*); |
#endif |
|
#define CONFIG_SOCK_PACKET 1 |
|
/* |
Proposed replacement for SIOC{ADD,DEL}MULTI and |
IFF_PROMISC, IFF_ALLMULTI flags. |
|
It is more expensive, but I believe, |
it is really correct solution: reentereble, safe and fault tolerant. |
|
IFF_PROMISC/IFF_ALLMULTI/SIOC{ADD/DEL}MULTI are faked by keeping |
reference count and global flag, so that real status is |
(gflag|(count != 0)), so that we can use obsolete faulty interface |
not harming clever users. |
*/ |
#define CONFIG_PACKET_MULTICAST 1 |
|
/* |
Assumptions: |
- if device has no dev->hard_header routine, it adds and removes ll header |
inside itself. In this case ll header is invisible outside of device, |
but higher levels still should reserve dev->hard_header_len. |
Some devices are enough clever to reallocate skb, when header |
will not fit to reserved space (tunnel), another ones are silly |
(PPP). |
- packet socket receives packets with pulled ll header, |
so that SOCK_RAW should push it back. |
|
On receive: |
----------- |
|
Incoming, dev->hard_header!=NULL |
mac.raw -> ll header |
data -> data |
|
Outgoing, dev->hard_header!=NULL |
mac.raw -> ll header |
data -> ll header |
|
Incoming, dev->hard_header==NULL |
mac.raw -> UNKNOWN position. It is very likely, that it points to ll header. |
PPP makes it, that is wrong, because introduce assymetry |
between rx and tx paths. |
data -> data |
|
Outgoing, dev->hard_header==NULL |
mac.raw -> data. ll header is still not built! |
data -> data |
|
Resume |
If dev->hard_header==NULL we are unlikely to restore sensible ll header. |
|
|
On transmit: |
------------ |
|
dev->hard_header != NULL |
mac.raw -> ll header |
data -> ll header |
|
dev->hard_header == NULL (ll header is added by device, we cannot control it) |
mac.raw -> data |
data -> data |
|
We should set nh.raw on output to correct posistion, |
packet classifier depends on it. |
*/ |
|
/* List of all packet sockets. */ |
static struct sock * packet_sklist; |
static rwlock_t packet_sklist_lock = RW_LOCK_UNLOCKED; |
|
atomic_t packet_socks_nr; |
|
|
/* Private packet socket structures. */ |
|
#ifdef CONFIG_PACKET_MULTICAST |
struct packet_mclist |
{ |
struct packet_mclist *next; |
int ifindex; |
int count; |
unsigned short type; |
unsigned short alen; |
unsigned char addr[8]; |
}; |
#endif |
#ifdef CONFIG_PACKET_MMAP |
static int packet_set_ring(struct sock *sk, struct tpacket_req *req, int closing); |
#endif |
|
static void packet_flush_mclist(struct sock *sk); |
|
struct packet_opt |
{ |
struct tpacket_stats stats; |
#ifdef CONFIG_PACKET_MMAP |
unsigned long *pg_vec; |
unsigned int head; |
unsigned int frames_per_block; |
unsigned int frame_size; |
unsigned int frame_max; |
int copy_thresh; |
#endif |
struct packet_type prot_hook; |
spinlock_t bind_lock; |
char running; /* prot_hook is attached*/ |
int ifindex; /* bound device */ |
#ifdef CONFIG_PACKET_MULTICAST |
struct packet_mclist *mclist; |
#endif |
#ifdef CONFIG_PACKET_MMAP |
atomic_t mapped; |
unsigned int pg_vec_order; |
unsigned int pg_vec_pages; |
unsigned int pg_vec_len; |
#endif |
}; |
|
#ifdef CONFIG_PACKET_MMAP |
|
static inline unsigned long packet_lookup_frame(struct packet_opt *po, unsigned int position) |
{ |
unsigned int pg_vec_pos, frame_offset; |
unsigned long frame; |
|
pg_vec_pos = position / po->frames_per_block; |
frame_offset = position % po->frames_per_block; |
|
frame = (unsigned long) (po->pg_vec[pg_vec_pos] + (frame_offset * po->frame_size)); |
|
return frame; |
} |
#endif |
|
void packet_sock_destruct(struct sock *sk) |
{ |
BUG_TRAP(atomic_read(&sk->rmem_alloc)==0); |
BUG_TRAP(atomic_read(&sk->wmem_alloc)==0); |
|
if (!sk->dead) { |
printk("Attempt to release alive packet socket: %p\n", sk); |
return; |
} |
|
if (sk->protinfo.destruct_hook) |
kfree(sk->protinfo.destruct_hook); |
atomic_dec(&packet_socks_nr); |
#ifdef PACKET_REFCNT_DEBUG |
printk(KERN_DEBUG "PACKET socket %p is free, %d are alive\n", sk, atomic_read(&packet_socks_nr)); |
#endif |
MOD_DEC_USE_COUNT; |
} |
|
|
extern struct proto_ops packet_ops; |
|
#ifdef CONFIG_SOCK_PACKET |
extern struct proto_ops packet_ops_spkt; |
|
static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt) |
{ |
struct sock *sk; |
struct sockaddr_pkt *spkt; |
|
/* |
* 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...] |
* |
* Incoming packets have ll header pulled, |
* push it back. |
* |
* For outgoing ones skb->data == skb->mac.raw |
* so that this procedure is noop. |
*/ |
|
if (skb->pkt_type == PACKET_LOOPBACK) |
goto out; |
|
if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) |
goto oom; |
|
spkt = (struct sockaddr_pkt*)skb->cb; |
|
skb_push(skb, skb->data-skb->mac.raw); |
|
/* |
* The SOCK_PACKET socket receives _all_ frames. |
*/ |
|
spkt->spkt_family = dev->type; |
strncpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device)); |
spkt->spkt_protocol = skb->protocol; |
|
/* |
* 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) |
return 0; |
|
out: |
kfree_skb(skb); |
oom: |
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_spkt(struct socket *sock, struct msghdr *msg, int len, |
struct scm_cookie *scm) |
{ |
struct sock *sk = sock->sk; |
struct sockaddr_pkt *saddr=(struct sockaddr_pkt *)msg->msg_name; |
struct sk_buff *skb; |
struct net_device *dev; |
unsigned short proto=0; |
int err; |
|
/* |
* 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_by_name(saddr->spkt_device); |
err = -ENODEV; |
if (dev == NULL) |
goto out_unlock; |
|
/* |
* 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. |
*/ |
|
err = -EMSGSIZE; |
if(len>dev->mtu+dev->hard_header_len) |
goto out_unlock; |
|
err = -ENOBUFS; |
skb = sock_wmalloc(sk, len+dev->hard_header_len+15, 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) |
goto out_unlock; |
|
/* |
* 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+15)&~15); |
skb->nh.raw = skb->data; |
|
/* Try to align data part correctly */ |
if (dev->hard_header) { |
skb->data -= dev->hard_header_len; |
skb->tail -= dev->hard_header_len; |
if (len < dev->hard_header_len) |
skb->nh.raw = skb->data; |
} |
|
/* Returns -EFAULT on error */ |
err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len); |
skb->protocol = proto; |
skb->dev = dev; |
skb->priority = sk->priority; |
if (err) |
goto out_free; |
|
err = -ENETDOWN; |
if (!(dev->flags & IFF_UP)) |
goto out_free; |
|
/* |
* Now send it |
*/ |
|
dev_queue_xmit(skb); |
dev_put(dev); |
return(len); |
|
out_free: |
kfree_skb(skb); |
out_unlock: |
if (dev) |
dev_put(dev); |
return err; |
} |
#endif |
|
/* |
This function makes lazy skb cloning in hope that most of packets |
are discarded by BPF. |
|
Note tricky part: we DO mangle shared skb! skb->data, skb->len |
and skb->cb are mangled. It works because (and until) packets |
falling here are owned by current CPU. Output packets are cloned |
by dev_queue_xmit_nit(), input packets are processed by net_bh |
sequencially, so that if we return skb to original state on exit, |
we will not harm anyone. |
*/ |
|
static int packet_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt) |
{ |
struct sock *sk; |
struct sockaddr_ll *sll; |
struct packet_opt *po; |
u8 * skb_head = skb->data; |
int skb_len = skb->len; |
#ifdef CONFIG_FILTER |
unsigned snaplen; |
#endif |
|
if (skb->pkt_type == PACKET_LOOPBACK) |
goto drop; |
|
sk = (struct sock *) pt->data; |
po = sk->protinfo.af_packet; |
|
skb->dev = dev; |
|
if (dev->hard_header) { |
/* The device has an explicit notion of ll header, |
exported to higher levels. |
|
Otherwise, the device hides datails of it frame |
structure, so that corresponding packet head |
never delivered to user. |
*/ |
if (sk->type != SOCK_DGRAM) |
skb_push(skb, skb->data - skb->mac.raw); |
else if (skb->pkt_type == PACKET_OUTGOING) { |
/* Special case: outgoing packets have ll header at head */ |
skb_pull(skb, skb->nh.raw - skb->data); |
} |
} |
|
#ifdef CONFIG_FILTER |
snaplen = skb->len; |
|
if (sk->filter) { |
unsigned res = snaplen; |
struct sk_filter *filter; |
|
bh_lock_sock(sk); |
if ((filter = sk->filter) != NULL) |
res = sk_run_filter(skb, sk->filter->insns, sk->filter->len); |
bh_unlock_sock(sk); |
|
if (res == 0) |
goto drop_n_restore; |
if (snaplen > res) |
snaplen = res; |
} |
#endif /* CONFIG_FILTER */ |
|
if (atomic_read(&sk->rmem_alloc) + skb->truesize >= (unsigned)sk->rcvbuf) |
goto drop_n_acct; |
|
if (skb_shared(skb)) { |
struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC); |
if (nskb == NULL) |
goto drop_n_acct; |
|
if (skb_head != skb->data) { |
skb->data = skb_head; |
skb->len = skb_len; |
} |
kfree_skb(skb); |
skb = nskb; |
} |
|
sll = (struct sockaddr_ll*)skb->cb; |
sll->sll_family = AF_PACKET; |
sll->sll_hatype = dev->type; |
sll->sll_protocol = skb->protocol; |
sll->sll_pkttype = skb->pkt_type; |
sll->sll_ifindex = dev->ifindex; |
sll->sll_halen = 0; |
|
if (dev->hard_header_parse) |
sll->sll_halen = dev->hard_header_parse(skb, sll->sll_addr); |
|
#ifdef CONFIG_FILTER |
if (pskb_trim(skb, snaplen)) |
goto drop_n_acct; |
#endif |
|
skb_set_owner_r(skb, sk); |
skb->dev = NULL; |
spin_lock(&sk->receive_queue.lock); |
po->stats.tp_packets++; |
__skb_queue_tail(&sk->receive_queue, skb); |
spin_unlock(&sk->receive_queue.lock); |
sk->data_ready(sk,skb->len); |
return 0; |
|
drop_n_acct: |
spin_lock(&sk->receive_queue.lock); |
po->stats.tp_drops++; |
spin_unlock(&sk->receive_queue.lock); |
|
#ifdef CONFIG_FILTER |
drop_n_restore: |
#endif |
if (skb_head != skb->data && skb_shared(skb)) { |
skb->data = skb_head; |
skb->len = skb_len; |
} |
drop: |
kfree_skb(skb); |
return 0; |
} |
|
#ifdef CONFIG_PACKET_MMAP |
static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt) |
{ |
struct sock *sk; |
struct packet_opt *po; |
struct sockaddr_ll *sll; |
struct tpacket_hdr *h; |
u8 * skb_head = skb->data; |
int skb_len = skb->len; |
unsigned snaplen; |
unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER; |
unsigned short macoff, netoff; |
struct sk_buff *copy_skb = NULL; |
|
if (skb->pkt_type == PACKET_LOOPBACK) |
goto drop; |
|
sk = (struct sock *) pt->data; |
po = sk->protinfo.af_packet; |
|
if (dev->hard_header) { |
if (sk->type != SOCK_DGRAM) |
skb_push(skb, skb->data - skb->mac.raw); |
else if (skb->pkt_type == PACKET_OUTGOING) { |
/* Special case: outgoing packets have ll header at head */ |
skb_pull(skb, skb->nh.raw - skb->data); |
if (skb->ip_summed == CHECKSUM_HW) |
status |= TP_STATUS_CSUMNOTREADY; |
} |
} |
|
snaplen = skb->len; |
|
#ifdef CONFIG_FILTER |
if (sk->filter) { |
unsigned res = snaplen; |
struct sk_filter *filter; |
|
bh_lock_sock(sk); |
if ((filter = sk->filter) != NULL) |
res = sk_run_filter(skb, sk->filter->insns, sk->filter->len); |
bh_unlock_sock(sk); |
|
if (res == 0) |
goto drop_n_restore; |
if (snaplen > res) |
snaplen = res; |
} |
#endif |
|
if (sk->type == SOCK_DGRAM) { |
macoff = netoff = TPACKET_ALIGN(TPACKET_HDRLEN) + 16; |
} else { |
unsigned maclen = skb->nh.raw - skb->data; |
netoff = TPACKET_ALIGN(TPACKET_HDRLEN + (maclen < 16 ? 16 : maclen)); |
macoff = netoff - maclen; |
} |
|
if (macoff + snaplen > po->frame_size) { |
if (po->copy_thresh && |
atomic_read(&sk->rmem_alloc) + skb->truesize < (unsigned)sk->rcvbuf) { |
if (skb_shared(skb)) { |
copy_skb = skb_clone(skb, GFP_ATOMIC); |
} else { |
copy_skb = skb_get(skb); |
skb_head = skb->data; |
} |
if (copy_skb) |
skb_set_owner_r(copy_skb, sk); |
} |
snaplen = po->frame_size - macoff; |
if ((int)snaplen < 0) |
snaplen = 0; |
} |
if (snaplen > skb->len-skb->data_len) |
snaplen = skb->len-skb->data_len; |
|
spin_lock(&sk->receive_queue.lock); |
h = (struct tpacket_hdr *)packet_lookup_frame(po, po->head); |
|
if (h->tp_status) |
goto ring_is_full; |
po->head = po->head != po->frame_max ? po->head+1 : 0; |
po->stats.tp_packets++; |
if (copy_skb) { |
status |= TP_STATUS_COPY; |
__skb_queue_tail(&sk->receive_queue, copy_skb); |
} |
if (!po->stats.tp_drops) |
status &= ~TP_STATUS_LOSING; |
spin_unlock(&sk->receive_queue.lock); |
|
memcpy((u8*)h + macoff, skb->data, snaplen); |
|
h->tp_len = skb->len; |
h->tp_snaplen = snaplen; |
h->tp_mac = macoff; |
h->tp_net = netoff; |
h->tp_sec = skb->stamp.tv_sec; |
h->tp_usec = skb->stamp.tv_usec; |
|
sll = (struct sockaddr_ll*)((u8*)h + TPACKET_ALIGN(sizeof(*h))); |
sll->sll_halen = 0; |
if (dev->hard_header_parse) |
sll->sll_halen = dev->hard_header_parse(skb, sll->sll_addr); |
sll->sll_family = AF_PACKET; |
sll->sll_hatype = dev->type; |
sll->sll_protocol = skb->protocol; |
sll->sll_pkttype = skb->pkt_type; |
sll->sll_ifindex = dev->ifindex; |
|
h->tp_status = status; |
mb(); |
|
{ |
struct page *p_start, *p_end; |
u8 *h_end = (u8 *)h + macoff + snaplen - 1; |
|
p_start = virt_to_page(h); |
p_end = virt_to_page(h_end); |
while (p_start <= p_end) { |
flush_dcache_page(p_start); |
p_start++; |
} |
} |
|
sk->data_ready(sk, 0); |
|
drop_n_restore: |
if (skb_head != skb->data && skb_shared(skb)) { |
skb->data = skb_head; |
skb->len = skb_len; |
} |
drop: |
kfree_skb(skb); |
return 0; |
|
ring_is_full: |
po->stats.tp_drops++; |
spin_unlock(&sk->receive_queue.lock); |
|
sk->data_ready(sk, 0); |
if (copy_skb) |
kfree_skb(copy_skb); |
goto drop_n_restore; |
} |
|
#endif |
|
|
static int packet_sendmsg(struct socket *sock, struct msghdr *msg, int len, |
struct scm_cookie *scm) |
{ |
struct sock *sk = sock->sk; |
struct sockaddr_ll *saddr=(struct sockaddr_ll *)msg->msg_name; |
struct sk_buff *skb; |
struct net_device *dev; |
unsigned short proto; |
unsigned char *addr; |
int ifindex, err, reserve = 0; |
|
/* |
* Get and verify the address. |
*/ |
|
if (saddr == NULL) { |
ifindex = sk->protinfo.af_packet->ifindex; |
proto = sk->num; |
addr = NULL; |
} else { |
err = -EINVAL; |
if (msg->msg_namelen < sizeof(struct sockaddr_ll)) |
goto out; |
ifindex = saddr->sll_ifindex; |
proto = saddr->sll_protocol; |
addr = saddr->sll_addr; |
} |
|
|
dev = dev_get_by_index(ifindex); |
err = -ENXIO; |
if (dev == NULL) |
goto out_unlock; |
if (sock->type == SOCK_RAW) |
reserve = dev->hard_header_len; |
|
err = -EMSGSIZE; |
if (len > dev->mtu+reserve) |
goto out_unlock; |
|
skb = sock_alloc_send_skb(sk, len+dev->hard_header_len+15, |
msg->msg_flags & MSG_DONTWAIT, &err); |
if (skb==NULL) |
goto out_unlock; |
|
skb_reserve(skb, (dev->hard_header_len+15)&~15); |
skb->nh.raw = skb->data; |
|
if (dev->hard_header) { |
int res; |
err = -EINVAL; |
res = dev->hard_header(skb, dev, ntohs(proto), addr, NULL, len); |
if (sock->type != SOCK_DGRAM) { |
skb->tail = skb->data; |
skb->len = 0; |
} else if (res < 0) |
goto out_free; |
} |
|
/* Returns -EFAULT on error */ |
err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len); |
if (err) |
goto out_free; |
|
skb->protocol = proto; |
skb->dev = dev; |
skb->priority = sk->priority; |
|
err = -ENETDOWN; |
if (!(dev->flags & IFF_UP)) |
goto out_free; |
|
/* |
* Now send it |
*/ |
|
err = dev_queue_xmit(skb); |
if (err > 0 && (err = net_xmit_errno(err)) != 0) |
goto out_unlock; |
|
dev_put(dev); |
|
return(len); |
|
out_free: |
kfree_skb(skb); |
out_unlock: |
if (dev) |
dev_put(dev); |
out: |
return err; |
} |
|
/* |
* Close a PACKET socket. This is fairly simple. We immediately go |
* to 'closed' state and remove our protocol entry in the device list. |
*/ |
|
static int packet_release(struct socket *sock) |
{ |
struct sock *sk = sock->sk; |
struct sock **skp; |
|
if (!sk) |
return 0; |
|
write_lock_bh(&packet_sklist_lock); |
for (skp = &packet_sklist; *skp; skp = &(*skp)->next) { |
if (*skp == sk) { |
*skp = sk->next; |
__sock_put(sk); |
break; |
} |
} |
write_unlock_bh(&packet_sklist_lock); |
|
/* |
* Unhook packet receive handler. |
*/ |
|
if (sk->protinfo.af_packet->running) { |
/* |
* Remove the protocol hook |
*/ |
dev_remove_pack(&sk->protinfo.af_packet->prot_hook); |
sk->protinfo.af_packet->running = 0; |
__sock_put(sk); |
} |
|
#ifdef CONFIG_PACKET_MULTICAST |
packet_flush_mclist(sk); |
#endif |
|
#ifdef CONFIG_PACKET_MMAP |
if (sk->protinfo.af_packet->pg_vec) { |
struct tpacket_req req; |
memset(&req, 0, sizeof(req)); |
packet_set_ring(sk, &req, 1); |
} |
#endif |
|
/* |
* Now the socket is dead. No more input will appear. |
*/ |
|
sock_orphan(sk); |
sock->sk = NULL; |
|
/* Purge queues */ |
|
skb_queue_purge(&sk->receive_queue); |
|
sock_put(sk); |
return 0; |
} |
|
/* |
* Attach a packet hook. |
*/ |
|
static int packet_do_bind(struct sock *sk, struct net_device *dev, int protocol) |
{ |
/* |
* Detach an existing hook if present. |
*/ |
|
lock_sock(sk); |
|
spin_lock(&sk->protinfo.af_packet->bind_lock); |
if (sk->protinfo.af_packet->running) { |
dev_remove_pack(&sk->protinfo.af_packet->prot_hook); |
__sock_put(sk); |
sk->protinfo.af_packet->running = 0; |
} |
|
sk->num = protocol; |
sk->protinfo.af_packet->prot_hook.type = protocol; |
sk->protinfo.af_packet->prot_hook.dev = dev; |
|
sk->protinfo.af_packet->ifindex = dev ? dev->ifindex : 0; |
|
if (protocol == 0) |
goto out_unlock; |
|
if (dev) { |
if (dev->flags&IFF_UP) { |
dev_add_pack(&sk->protinfo.af_packet->prot_hook); |
sock_hold(sk); |
sk->protinfo.af_packet->running = 1; |
} else { |
sk->err = ENETDOWN; |
if (!sk->dead) |
sk->error_report(sk); |
} |
} else { |
dev_add_pack(&sk->protinfo.af_packet->prot_hook); |
sock_hold(sk); |
sk->protinfo.af_packet->running = 1; |
} |
|
out_unlock: |
spin_unlock(&sk->protinfo.af_packet->bind_lock); |
release_sock(sk); |
return 0; |
} |
|
/* |
* Bind a packet socket to a device |
*/ |
|
#ifdef CONFIG_SOCK_PACKET |
|
static int packet_bind_spkt(struct socket *sock, struct sockaddr *uaddr, int addr_len) |
{ |
struct sock *sk=sock->sk; |
char name[15]; |
struct net_device *dev; |
int err = -ENODEV; |
|
/* |
* Check legality |
*/ |
|
if(addr_len!=sizeof(struct sockaddr)) |
return -EINVAL; |
strncpy(name,uaddr->sa_data,14); |
name[14]=0; |
|
dev = dev_get_by_name(name); |
if (dev) { |
err = packet_do_bind(sk, dev, sk->num); |
dev_put(dev); |
} |
return err; |
} |
#endif |
|
static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) |
{ |
struct sockaddr_ll *sll = (struct sockaddr_ll*)uaddr; |
struct sock *sk=sock->sk; |
struct net_device *dev = NULL; |
int err; |
|
|
/* |
* Check legality |
*/ |
|
if (addr_len < sizeof(struct sockaddr_ll)) |
return -EINVAL; |
if (sll->sll_family != AF_PACKET) |
return -EINVAL; |
|
if (sll->sll_ifindex) { |
err = -ENODEV; |
dev = dev_get_by_index(sll->sll_ifindex); |
if (dev == NULL) |
goto out; |
} |
err = packet_do_bind(sk, dev, sll->sll_protocol ? : sk->num); |
if (dev) |
dev_put(dev); |
|
out: |
return err; |
} |
|
|
/* |
* Create a packet of type SOCK_PACKET. |
*/ |
|
static int packet_create(struct socket *sock, int protocol) |
{ |
struct sock *sk; |
int err; |
|
if (!capable(CAP_NET_RAW)) |
return -EPERM; |
if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW |
#ifdef CONFIG_SOCK_PACKET |
&& sock->type != SOCK_PACKET |
#endif |
) |
return -ESOCKTNOSUPPORT; |
|
sock->state = SS_UNCONNECTED; |
MOD_INC_USE_COUNT; |
|
err = -ENOBUFS; |
sk = sk_alloc(PF_PACKET, GFP_KERNEL, 1); |
if (sk == NULL) |
goto out; |
|
sock->ops = &packet_ops; |
#ifdef CONFIG_SOCK_PACKET |
if (sock->type == SOCK_PACKET) |
sock->ops = &packet_ops_spkt; |
#endif |
sock_init_data(sock,sk); |
|
sk->protinfo.af_packet = kmalloc(sizeof(struct packet_opt), GFP_KERNEL); |
if (sk->protinfo.af_packet == NULL) |
goto out_free; |
memset(sk->protinfo.af_packet, 0, sizeof(struct packet_opt)); |
sk->family = PF_PACKET; |
sk->num = protocol; |
|
sk->destruct = packet_sock_destruct; |
atomic_inc(&packet_socks_nr); |
|
/* |
* Attach a protocol block |
*/ |
|
spin_lock_init(&sk->protinfo.af_packet->bind_lock); |
sk->protinfo.af_packet->prot_hook.func = packet_rcv; |
#ifdef CONFIG_SOCK_PACKET |
if (sock->type == SOCK_PACKET) |
sk->protinfo.af_packet->prot_hook.func = packet_rcv_spkt; |
#endif |
sk->protinfo.af_packet->prot_hook.data = (void *)sk; |
|
if (protocol) { |
sk->protinfo.af_packet->prot_hook.type = protocol; |
dev_add_pack(&sk->protinfo.af_packet->prot_hook); |
sock_hold(sk); |
sk->protinfo.af_packet->running = 1; |
} |
|
write_lock_bh(&packet_sklist_lock); |
sk->next = packet_sklist; |
packet_sklist = sk; |
sock_hold(sk); |
write_unlock_bh(&packet_sklist_lock); |
return(0); |
|
out_free: |
sk_free(sk); |
out: |
MOD_DEC_USE_COUNT; |
return err; |
} |
|
/* |
* Pull a packet from our receive queue and hand it to the user. |
* If necessary we block. |
*/ |
|
static int packet_recvmsg(struct socket *sock, struct msghdr *msg, int len, |
int flags, struct scm_cookie *scm) |
{ |
struct sock *sk = sock->sk; |
struct sk_buff *skb; |
int copied, err; |
|
err = -EINVAL; |
if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC)) |
goto out; |
|
#if 0 |
/* What error should we return now? EUNATTACH? */ |
if (sk->protinfo.af_packet->ifindex < 0) |
return -ENODEV; |
#endif |
|
/* |
* If the address length field is there to be filled in, we fill |
* it in now. |
*/ |
|
if (sock->type == SOCK_PACKET) |
msg->msg_namelen = sizeof(struct sockaddr_pkt); |
else |
msg->msg_namelen = sizeof(struct sockaddr_ll); |
|
/* |
* 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. |
* |
* Now it will return ENETDOWN, if device have just gone down, |
* but then it will block. |
*/ |
|
skb=skb_recv_datagram(sk,flags,flags&MSG_DONTWAIT,&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) |
goto out; |
|
/* |
* 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; |
} |
|
err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); |
if (err) |
goto out_free; |
|
sock_recv_timestamp(msg, sk, skb); |
|
if (msg->msg_name) |
memcpy(msg->msg_name, skb->cb, msg->msg_namelen); |
|
/* |
* Free or return the buffer as appropriate. Again this |
* hides all the races and re-entrancy issues from us. |
*/ |
err = (flags&MSG_TRUNC) ? skb->len : copied; |
|
out_free: |
skb_free_datagram(sk, skb); |
out: |
return err; |
} |
|
#ifdef CONFIG_SOCK_PACKET |
static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr, |
int *uaddr_len, int peer) |
{ |
struct net_device *dev; |
struct sock *sk = sock->sk; |
|
if (peer) |
return -EOPNOTSUPP; |
|
uaddr->sa_family = AF_PACKET; |
dev = dev_get_by_index(sk->protinfo.af_packet->ifindex); |
if (dev) { |
strncpy(uaddr->sa_data, dev->name, 15); |
dev_put(dev); |
} else |
memset(uaddr->sa_data, 0, 14); |
*uaddr_len = sizeof(*uaddr); |
|
return 0; |
} |
#endif |
|
static int packet_getname(struct socket *sock, struct sockaddr *uaddr, |
int *uaddr_len, int peer) |
{ |
struct net_device *dev; |
struct sock *sk = sock->sk; |
struct sockaddr_ll *sll = (struct sockaddr_ll*)uaddr; |
|
if (peer) |
return -EOPNOTSUPP; |
|
sll->sll_family = AF_PACKET; |
sll->sll_ifindex = sk->protinfo.af_packet->ifindex; |
sll->sll_protocol = sk->num; |
dev = dev_get_by_index(sk->protinfo.af_packet->ifindex); |
if (dev) { |
sll->sll_hatype = dev->type; |
sll->sll_halen = dev->addr_len; |
memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len); |
dev_put(dev); |
} else { |
sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */ |
sll->sll_halen = 0; |
} |
*uaddr_len = sizeof(*sll); |
|
return 0; |
} |
|
#ifdef CONFIG_PACKET_MULTICAST |
static void packet_dev_mc(struct net_device *dev, struct packet_mclist *i, int what) |
{ |
switch (i->type) { |
case PACKET_MR_MULTICAST: |
if (what > 0) |
dev_mc_add(dev, i->addr, i->alen, 0); |
else |
dev_mc_delete(dev, i->addr, i->alen, 0); |
break; |
case PACKET_MR_PROMISC: |
dev_set_promiscuity(dev, what); |
break; |
case PACKET_MR_ALLMULTI: |
dev_set_allmulti(dev, what); |
break; |
default:; |
} |
} |
|
static void packet_dev_mclist(struct net_device *dev, struct packet_mclist *i, int what) |
{ |
for ( ; i; i=i->next) { |
if (i->ifindex == dev->ifindex) |
packet_dev_mc(dev, i, what); |
} |
} |
|
static int packet_mc_add(struct sock *sk, struct packet_mreq *mreq) |
{ |
struct packet_mclist *ml, *i; |
struct net_device *dev; |
int err; |
|
rtnl_lock(); |
|
err = -ENODEV; |
dev = __dev_get_by_index(mreq->mr_ifindex); |
if (!dev) |
goto done; |
|
err = -EINVAL; |
if (mreq->mr_alen > dev->addr_len) |
goto done; |
|
err = -ENOBUFS; |
i = (struct packet_mclist *)kmalloc(sizeof(*i), GFP_KERNEL); |
if (i == NULL) |
goto done; |
|
err = 0; |
for (ml=sk->protinfo.af_packet->mclist; ml; ml=ml->next) { |
if (ml->ifindex == mreq->mr_ifindex && |
ml->type == mreq->mr_type && |
ml->alen == mreq->mr_alen && |
memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { |
ml->count++; |
/* Free the new element ... */ |
kfree(i); |
goto done; |
} |
} |
|
i->type = mreq->mr_type; |
i->ifindex = mreq->mr_ifindex; |
i->alen = mreq->mr_alen; |
memcpy(i->addr, mreq->mr_address, i->alen); |
i->count = 1; |
i->next = sk->protinfo.af_packet->mclist; |
sk->protinfo.af_packet->mclist = i; |
packet_dev_mc(dev, i, +1); |
|
done: |
rtnl_unlock(); |
return err; |
} |
|
static int packet_mc_drop(struct sock *sk, struct packet_mreq *mreq) |
{ |
struct packet_mclist *ml, **mlp; |
|
rtnl_lock(); |
|
for (mlp=&sk->protinfo.af_packet->mclist; (ml=*mlp)!=NULL; mlp=&ml->next) { |
if (ml->ifindex == mreq->mr_ifindex && |
ml->type == mreq->mr_type && |
ml->alen == mreq->mr_alen && |
memcmp(ml->addr, mreq->mr_address, ml->alen) == 0) { |
if (--ml->count == 0) { |
struct net_device *dev; |
*mlp = ml->next; |
dev = dev_get_by_index(ml->ifindex); |
if (dev) { |
packet_dev_mc(dev, ml, -1); |
dev_put(dev); |
} |
kfree(ml); |
} |
rtnl_unlock(); |
return 0; |
} |
} |
rtnl_unlock(); |
return -EADDRNOTAVAIL; |
} |
|
static void packet_flush_mclist(struct sock *sk) |
{ |
struct packet_mclist *ml; |
|
if (sk->protinfo.af_packet->mclist == NULL) |
return; |
|
rtnl_lock(); |
while ((ml=sk->protinfo.af_packet->mclist) != NULL) { |
struct net_device *dev; |
sk->protinfo.af_packet->mclist = ml->next; |
if ((dev = dev_get_by_index(ml->ifindex)) != NULL) { |
packet_dev_mc(dev, ml, -1); |
dev_put(dev); |
} |
kfree(ml); |
} |
rtnl_unlock(); |
} |
#endif |
|
static int |
packet_setsockopt(struct socket *sock, int level, int optname, char *optval, int optlen) |
{ |
struct sock *sk = sock->sk; |
int ret; |
|
if (level != SOL_PACKET) |
return -ENOPROTOOPT; |
|
switch(optname) { |
#ifdef CONFIG_PACKET_MULTICAST |
case PACKET_ADD_MEMBERSHIP: |
case PACKET_DROP_MEMBERSHIP: |
{ |
struct packet_mreq mreq; |
if (optlen<sizeof(mreq)) |
return -EINVAL; |
if (copy_from_user(&mreq,optval,sizeof(mreq))) |
return -EFAULT; |
if (optname == PACKET_ADD_MEMBERSHIP) |
ret = packet_mc_add(sk, &mreq); |
else |
ret = packet_mc_drop(sk, &mreq); |
return ret; |
} |
#endif |
#ifdef CONFIG_PACKET_MMAP |
case PACKET_RX_RING: |
{ |
struct tpacket_req req; |
|
if (optlen<sizeof(req)) |
return -EINVAL; |
if (copy_from_user(&req,optval,sizeof(req))) |
return -EFAULT; |
return packet_set_ring(sk, &req, 0); |
} |
case PACKET_COPY_THRESH: |
{ |
int val; |
|
if (optlen!=sizeof(val)) |
return -EINVAL; |
if (copy_from_user(&val,optval,sizeof(val))) |
return -EFAULT; |
|
sk->protinfo.af_packet->copy_thresh = val; |
return 0; |
} |
#endif |
default: |
return -ENOPROTOOPT; |
} |
} |
|
int packet_getsockopt(struct socket *sock, int level, int optname, |
char *optval, int *optlen) |
{ |
int len; |
struct sock *sk = sock->sk; |
|
if (level != SOL_PACKET) |
return -ENOPROTOOPT; |
|
if (get_user(len,optlen)) |
return -EFAULT; |
|
if (len < 0) |
return -EINVAL; |
|
switch(optname) { |
case PACKET_STATISTICS: |
{ |
struct tpacket_stats st; |
|
if (len > sizeof(struct tpacket_stats)) |
len = sizeof(struct tpacket_stats); |
spin_lock_bh(&sk->receive_queue.lock); |
st = sk->protinfo.af_packet->stats; |
memset(&sk->protinfo.af_packet->stats, 0, sizeof(st)); |
spin_unlock_bh(&sk->receive_queue.lock); |
st.tp_packets += st.tp_drops; |
|
if (copy_to_user(optval, &st, len)) |
return -EFAULT; |
break; |
} |
default: |
return -ENOPROTOOPT; |
} |
|
if (put_user(len, optlen)) |
return -EFAULT; |
return 0; |
} |
|
|
static int packet_notifier(struct notifier_block *this, unsigned long msg, void *data) |
{ |
struct sock *sk; |
struct packet_opt *po; |
struct net_device *dev = (struct net_device*)data; |
|
read_lock(&packet_sklist_lock); |
for (sk = packet_sklist; sk; sk = sk->next) { |
po = sk->protinfo.af_packet; |
|
switch (msg) { |
case NETDEV_UNREGISTER: |
#ifdef CONFIG_PACKET_MULTICAST |
if (po->mclist) |
packet_dev_mclist(dev, po->mclist, -1); |
// fallthrough |
#endif |
case NETDEV_DOWN: |
if (dev->ifindex == po->ifindex) { |
spin_lock(&po->bind_lock); |
if (po->running) { |
dev_remove_pack(&po->prot_hook); |
__sock_put(sk); |
po->running = 0; |
sk->err = ENETDOWN; |
if (!sk->dead) |
sk->error_report(sk); |
} |
if (msg == NETDEV_UNREGISTER) { |
po->ifindex = -1; |
po->prot_hook.dev = NULL; |
} |
spin_unlock(&po->bind_lock); |
} |
break; |
case NETDEV_UP: |
spin_lock(&po->bind_lock); |
if (dev->ifindex == po->ifindex && sk->num && po->running==0) { |
dev_add_pack(&po->prot_hook); |
sock_hold(sk); |
po->running = 1; |
} |
spin_unlock(&po->bind_lock); |
break; |
} |
} |
read_unlock(&packet_sklist_lock); |
return NOTIFY_DONE; |
} |
|
|
static int packet_ioctl(struct socket *sock, unsigned int cmd, |
unsigned long arg) |
{ |
struct sock *sk = sock->sk; |
|
switch(cmd) |
{ |
case SIOCOUTQ: |
{ |
int amount = atomic_read(&sk->wmem_alloc); |
return put_user(amount, (int *)arg); |
} |
case SIOCINQ: |
{ |
struct sk_buff *skb; |
int amount = 0; |
|
spin_lock_bh(&sk->receive_queue.lock); |
skb = skb_peek(&sk->receive_queue); |
if (skb) |
amount = skb->len; |
spin_unlock_bh(&sk->receive_queue.lock); |
return put_user(amount, (int *)arg); |
} |
case FIOSETOWN: |
case SIOCSPGRP: { |
int pid; |
if (get_user(pid, (int *) arg)) |
return -EFAULT; |
if (current->pid != pid && current->pgrp != -pid && |
!capable(CAP_NET_ADMIN)) |
return -EPERM; |
sk->proc = pid; |
break; |
} |
case FIOGETOWN: |
case SIOCGPGRP: |
return put_user(sk->proc, (int *)arg); |
case SIOCGSTAMP: |
if(sk->stamp.tv_sec==0) |
return -ENOENT; |
if (copy_to_user((void *)arg, &sk->stamp, |
sizeof(struct timeval))) |
return -EFAULT; |
break; |
case SIOCGIFFLAGS: |
#ifndef CONFIG_INET |
case SIOCSIFFLAGS: |
#endif |
case SIOCGIFCONF: |
case SIOCGIFMETRIC: |
case SIOCSIFMETRIC: |
case SIOCGIFMEM: |
case SIOCSIFMEM: |
case SIOCGIFMTU: |
case SIOCSIFMTU: |
case SIOCSIFLINK: |
case SIOCGIFHWADDR: |
case SIOCSIFHWADDR: |
case SIOCSIFMAP: |
case SIOCGIFMAP: |
case SIOCSIFSLAVE: |
case SIOCGIFSLAVE: |
case SIOCGIFINDEX: |
case SIOCGIFNAME: |
case SIOCGIFCOUNT: |
case SIOCSIFHWBROADCAST: |
return(dev_ioctl(cmd,(void *) arg)); |
|
case SIOCGIFBR: |
case SIOCSIFBR: |
#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) |
#ifdef CONFIG_INET |
#ifdef CONFIG_KMOD |
if (br_ioctl_hook == NULL) |
request_module("bridge"); |
#endif |
if (br_ioctl_hook != NULL) |
return br_ioctl_hook(arg); |
#endif |
#endif |
return -ENOPKG; |
|
case SIOCGIFDIVERT: |
case SIOCSIFDIVERT: |
#ifdef CONFIG_NET_DIVERT |
return divert_ioctl(cmd, (struct divert_cf *) arg); |
#else |
return -ENOPKG; |
#endif /* CONFIG_NET_DIVERT */ |
|
#ifdef CONFIG_INET |
case SIOCADDRT: |
case SIOCDELRT: |
case SIOCDARP: |
case SIOCGARP: |
case SIOCSARP: |
case SIOCGIFADDR: |
case SIOCSIFADDR: |
case SIOCGIFBRDADDR: |
case SIOCSIFBRDADDR: |
case SIOCGIFNETMASK: |
case SIOCSIFNETMASK: |
case SIOCGIFDSTADDR: |
case SIOCSIFDSTADDR: |
case SIOCSIFFLAGS: |
case SIOCADDDLCI: |
case SIOCDELDLCI: |
return inet_dgram_ops.ioctl(sock, cmd, arg); |
#endif |
|
default: |
if ((cmd >= SIOCDEVPRIVATE) && |
(cmd <= (SIOCDEVPRIVATE + 15))) |
return(dev_ioctl(cmd,(void *) arg)); |
|
#ifdef CONFIG_NET_RADIO |
if((cmd >= SIOCIWFIRST) && (cmd <= SIOCIWLAST)) |
return(dev_ioctl(cmd,(void *) arg)); |
#endif |
return -EOPNOTSUPP; |
} |
return 0; |
} |
|
#ifndef CONFIG_PACKET_MMAP |
#define packet_mmap sock_no_mmap |
#define packet_poll datagram_poll |
#else |
|
unsigned int packet_poll(struct file * file, struct socket *sock, poll_table *wait) |
{ |
struct sock *sk = sock->sk; |
struct packet_opt *po = sk->protinfo.af_packet; |
unsigned int mask = datagram_poll(file, sock, wait); |
|
spin_lock_bh(&sk->receive_queue.lock); |
if (po->pg_vec) { |
unsigned last = po->head ? po->head-1 : po->frame_max; |
struct tpacket_hdr *h; |
|
h = (struct tpacket_hdr *)packet_lookup_frame(po, last); |
|
if (h->tp_status) |
mask |= POLLIN | POLLRDNORM; |
} |
spin_unlock_bh(&sk->receive_queue.lock); |
return mask; |
} |
|
|
/* Dirty? Well, I still did not learn better way to account |
* for user mmaps. |
*/ |
|
static void packet_mm_open(struct vm_area_struct *vma) |
{ |
struct file *file = vma->vm_file; |
struct inode *inode = file->f_dentry->d_inode; |
struct socket * sock = &inode->u.socket_i; |
struct sock *sk = sock->sk; |
|
if (sk) |
atomic_inc(&sk->protinfo.af_packet->mapped); |
} |
|
static void packet_mm_close(struct vm_area_struct *vma) |
{ |
struct file *file = vma->vm_file; |
struct inode *inode = file->f_dentry->d_inode; |
struct socket * sock = &inode->u.socket_i; |
struct sock *sk = sock->sk; |
|
if (sk) |
atomic_dec(&sk->protinfo.af_packet->mapped); |
} |
|
static struct vm_operations_struct packet_mmap_ops = { |
open: packet_mm_open, |
close: packet_mm_close, |
}; |
|
static void free_pg_vec(unsigned long *pg_vec, unsigned order, unsigned len) |
{ |
int i; |
|
for (i=0; i<len; i++) { |
if (pg_vec[i]) { |
struct page *page, *pend; |
|
pend = virt_to_page(pg_vec[i] + (PAGE_SIZE << order) - 1); |
for (page = virt_to_page(pg_vec[i]); page <= pend; page++) |
ClearPageReserved(page); |
free_pages(pg_vec[i], order); |
} |
} |
kfree(pg_vec); |
} |
|
|
static int packet_set_ring(struct sock *sk, struct tpacket_req *req, int closing) |
{ |
unsigned long *pg_vec = NULL; |
struct packet_opt *po = sk->protinfo.af_packet; |
int order = 0; |
int err = 0; |
|
if (req->tp_block_nr) { |
int i, l; |
|
/* Sanity tests and some calculations */ |
|
if (po->pg_vec) |
return -EBUSY; |
|
if ((int)req->tp_block_size <= 0) |
return -EINVAL; |
if (req->tp_block_size&(PAGE_SIZE-1)) |
return -EINVAL; |
if (req->tp_frame_size < TPACKET_HDRLEN) |
return -EINVAL; |
if (req->tp_frame_size&(TPACKET_ALIGNMENT-1)) |
return -EINVAL; |
|
po->frames_per_block = req->tp_block_size/req->tp_frame_size; |
if (po->frames_per_block <= 0) |
return -EINVAL; |
if (po->frames_per_block*req->tp_block_nr != req->tp_frame_nr) |
return -EINVAL; |
/* OK! */ |
|
/* Allocate page vector */ |
while ((PAGE_SIZE<<order) < req->tp_block_size) |
order++; |
|
err = -ENOMEM; |
|
pg_vec = kmalloc(req->tp_block_nr*sizeof(unsigned long*), GFP_KERNEL); |
if (pg_vec == NULL) |
goto out; |
memset(pg_vec, 0, req->tp_block_nr*sizeof(unsigned long*)); |
|
for (i=0; i<req->tp_block_nr; i++) { |
struct page *page, *pend; |
pg_vec[i] = __get_free_pages(GFP_KERNEL, order); |
if (!pg_vec[i]) |
goto out_free_pgvec; |
memset((void *)(pg_vec[i]), 0, PAGE_SIZE << order); |
pend = virt_to_page(pg_vec[i] + (PAGE_SIZE << order) - 1); |
for (page = virt_to_page(pg_vec[i]); page <= pend; page++) |
SetPageReserved(page); |
} |
/* Page vector is allocated */ |
|
l = 0; |
for (i=0; i<req->tp_block_nr; i++) { |
unsigned long ptr = pg_vec[i]; |
struct tpacket_hdr *header; |
int k; |
|
for (k=0; k<po->frames_per_block; k++) { |
|
header = (struct tpacket_hdr*)ptr; |
header->tp_status = TP_STATUS_KERNEL; |
ptr += req->tp_frame_size; |
} |
} |
/* Done */ |
} else { |
if (req->tp_frame_nr) |
return -EINVAL; |
} |
|
lock_sock(sk); |
|
/* Detach socket from network */ |
spin_lock(&po->bind_lock); |
if (po->running) |
dev_remove_pack(&po->prot_hook); |
spin_unlock(&po->bind_lock); |
|
err = -EBUSY; |
if (closing || atomic_read(&po->mapped) == 0) { |
err = 0; |
#define XC(a, b) ({ __typeof__ ((a)) __t; __t = (a); (a) = (b); __t; }) |
|
spin_lock_bh(&sk->receive_queue.lock); |
pg_vec = XC(po->pg_vec, pg_vec); |
po->frame_max = req->tp_frame_nr-1; |
po->head = 0; |
po->frame_size = req->tp_frame_size; |
spin_unlock_bh(&sk->receive_queue.lock); |
|
order = XC(po->pg_vec_order, order); |
req->tp_block_nr = XC(po->pg_vec_len, req->tp_block_nr); |
|
po->pg_vec_pages = req->tp_block_size/PAGE_SIZE; |
po->prot_hook.func = po->pg_vec ? tpacket_rcv : packet_rcv; |
skb_queue_purge(&sk->receive_queue); |
#undef XC |
if (atomic_read(&po->mapped)) |
printk(KERN_DEBUG "packet_mmap: vma is busy: %d\n", atomic_read(&po->mapped)); |
} |
|
spin_lock(&po->bind_lock); |
if (po->running) |
dev_add_pack(&po->prot_hook); |
spin_unlock(&po->bind_lock); |
|
release_sock(sk); |
|
out_free_pgvec: |
if (pg_vec) |
free_pg_vec(pg_vec, order, req->tp_block_nr); |
out: |
return err; |
} |
|
static int packet_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) |
{ |
struct sock *sk = sock->sk; |
struct packet_opt *po = sk->protinfo.af_packet; |
unsigned long size; |
unsigned long start; |
int err = -EINVAL; |
int i; |
|
if (vma->vm_pgoff) |
return -EINVAL; |
|
size = vma->vm_end - vma->vm_start; |
|
lock_sock(sk); |
if (po->pg_vec == NULL) |
goto out; |
if (size != po->pg_vec_len*po->pg_vec_pages*PAGE_SIZE) |
goto out; |
|
atomic_inc(&po->mapped); |
start = vma->vm_start; |
err = -EAGAIN; |
for (i=0; i<po->pg_vec_len; i++) { |
if (remap_page_range(start, __pa(po->pg_vec[i]), |
po->pg_vec_pages*PAGE_SIZE, |
vma->vm_page_prot)) |
goto out; |
start += po->pg_vec_pages*PAGE_SIZE; |
} |
vma->vm_ops = &packet_mmap_ops; |
err = 0; |
|
out: |
release_sock(sk); |
return err; |
} |
#endif |
|
|
#ifdef CONFIG_SOCK_PACKET |
struct proto_ops packet_ops_spkt = { |
family: PF_PACKET, |
|
release: packet_release, |
bind: packet_bind_spkt, |
connect: sock_no_connect, |
socketpair: sock_no_socketpair, |
accept: sock_no_accept, |
getname: packet_getname_spkt, |
poll: datagram_poll, |
ioctl: packet_ioctl, |
listen: sock_no_listen, |
shutdown: sock_no_shutdown, |
setsockopt: sock_no_setsockopt, |
getsockopt: sock_no_getsockopt, |
sendmsg: packet_sendmsg_spkt, |
recvmsg: packet_recvmsg, |
mmap: sock_no_mmap, |
sendpage: sock_no_sendpage, |
}; |
#endif |
|
struct proto_ops packet_ops = { |
family: PF_PACKET, |
|
release: packet_release, |
bind: packet_bind, |
connect: sock_no_connect, |
socketpair: sock_no_socketpair, |
accept: sock_no_accept, |
getname: packet_getname, |
poll: packet_poll, |
ioctl: packet_ioctl, |
listen: sock_no_listen, |
shutdown: sock_no_shutdown, |
setsockopt: packet_setsockopt, |
getsockopt: packet_getsockopt, |
sendmsg: packet_sendmsg, |
recvmsg: packet_recvmsg, |
mmap: packet_mmap, |
sendpage: sock_no_sendpage, |
}; |
|
static struct net_proto_family packet_family_ops = { |
family: PF_PACKET, |
create: packet_create, |
}; |
|
static struct notifier_block packet_netdev_notifier = { |
notifier_call: packet_notifier, |
}; |
|
#ifdef CONFIG_PROC_FS |
static int packet_read_proc(char *buffer, char **start, off_t offset, |
int length, int *eof, void *data) |
{ |
off_t pos=0; |
off_t begin=0; |
int len=0; |
struct sock *s; |
|
len+= sprintf(buffer,"sk RefCnt Type Proto Iface R Rmem User Inode\n"); |
|
read_lock(&packet_sklist_lock); |
|
for (s = packet_sklist; s; s = s->next) { |
len+=sprintf(buffer+len,"%p %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu", |
s, |
atomic_read(&s->refcnt), |
s->type, |
ntohs(s->num), |
s->protinfo.af_packet->ifindex, |
s->protinfo.af_packet->running, |
atomic_read(&s->rmem_alloc), |
sock_i_uid(s), |
sock_i_ino(s) |
); |
|
buffer[len++]='\n'; |
|
pos=begin+len; |
if(pos<offset) { |
len=0; |
begin=pos; |
} |
if(pos>offset+length) |
goto done; |
} |
*eof = 1; |
|
done: |
read_unlock(&packet_sklist_lock); |
*start=buffer+(offset-begin); |
len-=(offset-begin); |
if(len>length) |
len=length; |
if(len<0) |
len=0; |
return len; |
} |
#endif |
|
static void __exit packet_exit(void) |
{ |
remove_proc_entry("net/packet", 0); |
unregister_netdevice_notifier(&packet_netdev_notifier); |
sock_unregister(PF_PACKET); |
return; |
} |
|
static int __init packet_init(void) |
{ |
sock_register(&packet_family_ops); |
register_netdevice_notifier(&packet_netdev_notifier); |
#ifdef CONFIG_PROC_FS |
create_proc_read_entry("net/packet", 0, 0, packet_read_proc, NULL); |
#endif |
return 0; |
} |
|
module_init(packet_init); |
module_exit(packet_exit); |
MODULE_LICENSE("GPL"); |