diff options
Diffstat (limited to 'net/packet/af_packet.c')
| -rw-r--r-- | net/packet/af_packet.c | 1907 |
1 files changed, 1907 insertions, 0 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c new file mode 100644 index 00000000000..64acea0adaa --- /dev/null +++ b/net/packet/af_packet.c @@ -0,0 +1,1907 @@ +/* + * 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 1.61 2002/02/08 03:57:19 davem 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 <asm/page.h> +#include <asm/io.h> +#include <linux/proc_fs.h> +#include <linux/seq_file.h> +#include <linux/poll.h> +#include <linux/module.h> +#include <linux/init.h> + +#ifdef CONFIG_INET +#include <net/inet_common.h> +#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 HLIST_HEAD(packet_sklist); +static DEFINE_RWLOCK(packet_sklist_lock); + +static 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_sock { + /* struct sock has to be the first member of packet_sock */ + struct sock sk; + struct tpacket_stats stats; +#ifdef CONFIG_PACKET_MMAP + char * *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 */ + unsigned short num; +#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 char *packet_lookup_frame(struct packet_sock *po, unsigned int position) +{ + unsigned int pg_vec_pos, frame_offset; + char *frame; + + pg_vec_pos = position / po->frames_per_block; + frame_offset = position % po->frames_per_block; + + frame = po->pg_vec[pg_vec_pos] + (frame_offset * po->frame_size); + + return frame; +} +#endif + +static inline struct packet_sock *pkt_sk(struct sock *sk) +{ + return (struct packet_sock *)sk; +} + +static void packet_sock_destruct(struct sock *sk) +{ + BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc)); + BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc)); + + if (!sock_flag(sk, SOCK_DEAD)) { + printk("Attempt to release alive packet socket: %p\n", sk); + return; + } + + 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 +} + + +static struct proto_ops packet_ops; + +#ifdef CONFIG_SOCK_PACKET +static 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 = pt->af_packet_priv; + + /* + * 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; + + /* drop any routing info */ + dst_release(skb->dst); + skb->dst = NULL; + + 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; + strlcpy(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 kiocb *iocb, struct socket *sock, + struct msghdr *msg, size_t len) +{ + 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 + LL_RESERVED_SPACE(dev), 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, LL_RESERVED_SPACE(dev)); + 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->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 + +static inline unsigned run_filter(struct sk_buff *skb, struct sock *sk, unsigned res) +{ + struct sk_filter *filter; + + bh_lock_sock(sk); + filter = sk->sk_filter; + /* + * Our caller already checked that filter != NULL but we need to + * verify that under bh_lock_sock() to be safe + */ + if (likely(filter != NULL)) + res = sk_run_filter(skb, filter->insns, filter->len); + bh_unlock_sock(sk); + + return res; +} + +/* + 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_sock *po; + u8 * skb_head = skb->data; + int skb_len = skb->len; + unsigned snaplen; + + if (skb->pkt_type == PACKET_LOOPBACK) + goto drop; + + sk = pt->af_packet_priv; + po = pkt_sk(sk); + + 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->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); + } + } + + snaplen = skb->len; + + if (sk->sk_filter) { + unsigned res = run_filter(skb, sk, snaplen); + if (res == 0) + goto drop_n_restore; + if (snaplen > res) + snaplen = res; + } + + if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= + (unsigned)sk->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); + + if (pskb_trim(skb, snaplen)) + goto drop_n_acct; + + skb_set_owner_r(skb, sk); + skb->dev = NULL; + dst_release(skb->dst); + skb->dst = NULL; + + spin_lock(&sk->sk_receive_queue.lock); + po->stats.tp_packets++; + __skb_queue_tail(&sk->sk_receive_queue, skb); + spin_unlock(&sk->sk_receive_queue.lock); + sk->sk_data_ready(sk, skb->len); + return 0; + +drop_n_acct: + spin_lock(&sk->sk_receive_queue.lock); + po->stats.tp_drops++; + spin_unlock(&sk->sk_receive_queue.lock); + +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; +} + +#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_sock *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 = pt->af_packet_priv; + po = pkt_sk(sk); + + if (dev->hard_header) { + if (sk->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; + + if (sk->sk_filter) { + unsigned res = run_filter(skb, sk, snaplen); + if (res == 0) + goto drop_n_restore; + if (snaplen > res) + snaplen = res; + } + + if (sk->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->sk_rmem_alloc) + skb->truesize < + (unsigned)sk->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->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->sk_receive_queue, copy_skb); + } + if (!po->stats.tp_drops) + status &= ~TP_STATUS_LOSING; + spin_unlock(&sk->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; + if (skb->stamp.tv_sec == 0) { + do_gettimeofday(&skb->stamp); + sock_enable_timestamp(sk); + } + 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->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->sk_receive_queue.lock); + + sk->sk_data_ready(sk, 0); + if (copy_skb) + kfree_skb(copy_skb); + goto drop_n_restore; +} + +#endif + + +static int packet_sendmsg(struct kiocb *iocb, struct socket *sock, + struct msghdr *msg, size_t len) +{ + 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) { + struct packet_sock *po = pkt_sk(sk); + + ifindex = po->ifindex; + proto = po->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 + LL_RESERVED_SPACE(dev), + msg->msg_flags & MSG_DONTWAIT, &err); + if (skb==NULL) + goto out_unlock; + + skb_reserve(skb, LL_RESERVED_SPACE(dev)); + 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->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 packet_sock *po; + + if (!sk) + return 0; + + po = pkt_sk(sk); + + write_lock_bh(&packet_sklist_lock); + sk_del_node_init(sk); + write_unlock_bh(&packet_sklist_lock); + + /* + * Unhook packet receive handler. + */ + + if (po->running) { + /* + * Remove the protocol hook + */ + dev_remove_pack(&po->prot_hook); + po->running = 0; + po->num = 0; + __sock_put(sk); + } + +#ifdef CONFIG_PACKET_MULTICAST + packet_flush_mclist(sk); +#endif + +#ifdef CONFIG_PACKET_MMAP + if (po->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->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) +{ + struct packet_sock *po = pkt_sk(sk); + /* + * Detach an existing hook if present. + */ + + lock_sock(sk); + + spin_lock(&po->bind_lock); + if (po->running) { + __sock_put(sk); + po->running = 0; + po->num = 0; + spin_unlock(&po->bind_lock); + dev_remove_pack(&po->prot_hook); + spin_lock(&po->bind_lock); + } + + po->num = protocol; + po->prot_hook.type = protocol; + po->prot_hook.dev = dev; + + po->ifindex = dev ? dev->ifindex : 0; + + if (protocol == 0) + goto out_unlock; + + if (dev) { + if (dev->flags&IFF_UP) { + dev_add_pack(&po->prot_hook); + sock_hold(sk); + po->running = 1; + } else { + sk->sk_err = ENETDOWN; + if (!sock_flag(sk, SOCK_DEAD)) + sk->sk_error_report(sk); + } + } else { + dev_add_pack(&po->prot_hook); + sock_hold(sk); + po->running = 1; + } + +out_unlock: + spin_unlock(&po->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; + strlcpy(name,uaddr->sa_data,sizeof(name)); + + dev = dev_get_by_name(name); + if (dev) { + err = packet_do_bind(sk, dev, pkt_sk(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 ? : pkt_sk(sk)->num); + if (dev) + dev_put(dev); + +out: + return err; +} + +static struct proto packet_proto = { + .name = "PACKET", + .owner = THIS_MODULE, + .obj_size = sizeof(struct packet_sock), +}; + +/* + * Create a packet of type SOCK_PACKET. + */ + +static int packet_create(struct socket *sock, int protocol) +{ + struct sock *sk; + struct packet_sock *po; + 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; + + err = -ENOBUFS; + sk = sk_alloc(PF_PACKET, GFP_KERNEL, &packet_proto, 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); + + po = pkt_sk(sk); + sk->sk_family = PF_PACKET; + po->num = protocol; + + sk->sk_destruct = packet_sock_destruct; + atomic_inc(&packet_socks_nr); + + /* + * Attach a protocol block + */ + + spin_lock_init(&po->bind_lock); + po->prot_hook.func = packet_rcv; +#ifdef CONFIG_SOCK_PACKET + if (sock->type == SOCK_PACKET) + po->prot_hook.func = packet_rcv_spkt; +#endif + po->prot_hook.af_packet_priv = sk; + + if (protocol) { + po->prot_hook.type = protocol; + dev_add_pack(&po->prot_hook); + sock_hold(sk); + po->running = 1; + } + + write_lock_bh(&packet_sklist_lock); + sk_add_node(sk, &packet_sklist); + write_unlock_bh(&packet_sklist_lock); + return(0); +out: + return err; +} + +/* + * Pull a packet from our receive queue and hand it to the user. + * If necessary we block. + */ + +static int packet_recvmsg(struct kiocb *iocb, struct socket *sock, + struct msghdr *msg, size_t len, int flags) +{ + struct sock *sk = sock->sk; + struct sk_buff *skb; + int copied, err; + + err = -EINVAL; + if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT)) + goto out; + +#if 0 + /* What error should we return now? EUNATTACH? */ + if (pkt_sk(sk)->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(pkt_sk(sk)->ifindex); + if (dev) { + strlcpy(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 packet_sock *po = pkt_sk(sk); + struct sockaddr_ll *sll = (struct sockaddr_ll*)uaddr; + + if (peer) + return -EOPNOTSUPP; + + sll->sll_family = AF_PACKET; + sll->sll_ifindex = po->ifindex; + sll->sll_protocol = po->num; + dev = dev_get_by_index(po->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_sock *po = pkt_sk(sk); + 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 = po->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 = po->mclist; + po->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 = &pkt_sk(sk)->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_sock *po = pkt_sk(sk); + struct packet_mclist *ml; + + if (!po->mclist) + return; + + rtnl_lock(); + while ((ml = po->mclist) != NULL) { + struct net_device *dev; + + po->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 __user *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; + + pkt_sk(sk)->copy_thresh = val; + return 0; + } +#endif + default: + return -ENOPROTOOPT; + } +} + +static int packet_getsockopt(struct socket *sock, int level, int optname, + char __user *optval, int __user *optlen) +{ + int len; + struct sock *sk = sock->sk; + struct packet_sock *po = pkt_sk(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->sk_receive_queue.lock); + st = po->stats; + memset(&po->stats, 0, sizeof(st)); + spin_unlock_bh(&sk->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 hlist_node *node; + struct net_device *dev = (struct net_device*)data; + + read_lock(&packet_sklist_lock); + sk_for_each(sk, node, &packet_sklist) { + struct packet_sock *po = pkt_sk(sk); + + 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->sk_err = ENETDOWN; + if (!sock_flag(sk, SOCK_DEAD)) + sk->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 && po->num && + !po->running) { + 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->sk_wmem_alloc); + return put_user(amount, (int __user *)arg); + } + case SIOCINQ: + { + struct sk_buff *skb; + int amount = 0; + + spin_lock_bh(&sk->sk_receive_queue.lock); + skb = skb_peek(&sk->sk_receive_queue); + if (skb) + amount = skb->len; + spin_unlock_bh(&sk->sk_receive_queue.lock); + return put_user(amount, (int __user *)arg); + } + case SIOCGSTAMP: + return sock_get_timestamp(sk, (struct timeval __user *)arg); + +#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: + return inet_dgram_ops.ioctl(sock, cmd, arg); +#endif + + default: + return dev_ioctl(cmd, (void __user *)arg); + } + return 0; +} + +#ifndef CONFIG_PACKET_MMAP +#define packet_mmap sock_no_mmap +#define packet_poll datagram_poll +#else + +static unsigned int packet_poll(struct file * file, struct socket *sock, + poll_table *wait) +{ + struct sock *sk = sock->sk; + struct packet_sock *po = pkt_sk(sk); + unsigned int mask = datagram_poll(file, sock, wait); + + spin_lock_bh(&sk->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->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 = SOCKET_I(inode); + struct sock *sk = sock->sk; + + if (sk) + atomic_inc(&pkt_sk(sk)->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 = SOCKET_I(inode); + struct sock *sk = sock->sk; + + if (sk) + atomic_dec(&pkt_sk(sk)->mapped); +} + +static struct vm_operations_struct packet_mmap_ops = { + .open = packet_mm_open, + .close =packet_mm_close, +}; + +static inline struct page *pg_vec_endpage(char *one_pg_vec, unsigned int order) +{ + return virt_to_page(one_pg_vec + (PAGE_SIZE << order) - 1); +} + +static void free_pg_vec(char **pg_vec, unsigned order, unsigned len) +{ + int i; + + for (i=0; i<len; i++) { + if (pg_vec[i]) { + struct page *page, *pend; + + pend = pg_vec_endpage(pg_vec[i], order); + for (page = virt_to_page(pg_vec[i]); page <= pend; page++) + ClearPageReserved(page); + free_pages((unsigned long)pg_vec[i], order); + } + } + kfree(pg_vec); +} + + +static int packet_set_ring(struct sock *sk, struct tpacket_req *req, int closing) +{ + char **pg_vec = NULL; + struct packet_sock *po = pkt_sk(sk); + int was_running, num, 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(char *), GFP_KERNEL); + if (pg_vec == NULL) + goto out; + memset(pg_vec, 0, req->tp_block_nr*sizeof(char **)); + + for (i=0; i<req->tp_block_nr; i++) { + struct page *page, *pend; + pg_vec[i] = (char *)__get_free_pages(GFP_KERNEL, order); + if (!pg_vec[i]) + goto out_free_pgvec; + + pend = pg_vec_endpage(pg_vec[i], order); + 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++) { + char *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); + was_running = po->running; + num = po->num; + if (was_running) { + __dev_remove_pack(&po->prot_hook); + po->num = 0; + po->running = 0; + __sock_put(sk); + } + spin_unlock(&po->bind_lock); + + synchronize_net(); + + 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->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->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->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 (was_running && !po->running) { + sock_hold(sk); + po->running = 1; + po->num = num; + 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_sock *po = pkt_sk(sk); + 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_pfn_range(vma, start, + __pa(po->pg_vec[i]) >> PAGE_SHIFT, + 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 +static struct proto_ops packet_ops_spkt = { + .family = PF_PACKET, + .owner = THIS_MODULE, + .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 + +static struct proto_ops packet_ops = { + .family = PF_PACKET, + .owner = THIS_MODULE, + .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, + .owner = THIS_MODULE, +}; + +static struct notifier_block packet_netdev_notifier = { + .notifier_call =packet_notifier, +}; + +#ifdef CONFIG_PROC_FS +static inline struct sock *packet_seq_idx(loff_t off) +{ + struct sock *s; + struct hlist_node *node; + + sk_for_each(s, node, &packet_sklist) { + if (!off--) + return s; + } + return NULL; +} + +static void *packet_seq_start(struct seq_file *seq, loff_t *pos) +{ + read_lock(&packet_sklist_lock); + return *pos ? packet_seq_idx(*pos - 1) : SEQ_START_TOKEN; +} + +static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos) +{ + ++*pos; + return (v == SEQ_START_TOKEN) + ? sk_head(&packet_sklist) + : sk_next((struct sock*)v) ; +} + +static void packet_seq_stop(struct seq_file *seq, void *v) +{ + read_unlock(&packet_sklist_lock); +} + +static int packet_seq_show(struct seq_file *seq, void *v) +{ + if (v == SEQ_START_TOKEN) + seq_puts(seq, "sk RefCnt Type Proto Iface R Rmem User Inode\n"); + else { + struct sock *s = v; + const struct packet_sock *po = pkt_sk(s); + + seq_printf(seq, + "%p %-6d %-4d %04x %-5d %1d %-6u %-6u %-6lu\n", + s, + atomic_read(&s->sk_refcnt), + s->sk_type, + ntohs(po->num), + po->ifindex, + po->running, + atomic_read(&s->sk_rmem_alloc), + sock_i_uid(s), + sock_i_ino(s) ); + } + + return 0; +} + +static struct seq_operations packet_seq_ops = { + .start = packet_seq_start, + .next = packet_seq_next, + .stop = packet_seq_stop, + .show = packet_seq_show, +}; + +static int packet_seq_open(struct inode *inode, struct file *file) +{ + return seq_open(file, &packet_seq_ops); +} + +static struct file_operations packet_seq_fops = { + .owner = THIS_MODULE, + .open = packet_seq_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release, +}; + +#endif + +static void __exit packet_exit(void) +{ + proc_net_remove("packet"); + unregister_netdevice_notifier(&packet_netdev_notifier); + sock_unregister(PF_PACKET); + proto_unregister(&packet_proto); +} + +static int __init packet_init(void) +{ + int rc = proto_register(&packet_proto, 0); + + if (rc != 0) + goto out; + + sock_register(&packet_family_ops); + register_netdevice_notifier(&packet_netdev_notifier); + proc_net_fops_create("packet", 0, &packet_seq_fops); +out: + return rc; +} + +module_init(packet_init); +module_exit(packet_exit); +MODULE_LICENSE("GPL"); +MODULE_ALIAS_NETPROTO(PF_PACKET); |