| /* |
| * 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. |
| * |
| * Authors: Ross Biro |
| * 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. |
| * Eric Biederman : Allow for > 8 byte hardware addresses. |
| * The convention is that longer addresses |
| * will simply extend the hardware address |
| * byte arrays at the end of sockaddr_ll |
| * and packet_mreq. |
| * Johann Baudy : Added TX RING. |
| * |
| * 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/mm.h> |
| #include <linux/capability.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/kernel.h> |
| #include <linux/kmod.h> |
| #include <linux/slab.h> |
| #include <linux/vmalloc.h> |
| #include <net/net_namespace.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/cacheflush.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> |
| #include <linux/mutex.h> |
| #include <linux/if_vlan.h> |
| #include <linux/virtio_net.h> |
| #include <linux/errqueue.h> |
| #include <linux/net_tstamp.h> |
| |
| #ifdef CONFIG_INET |
| #include <net/inet_common.h> |
| #endif |
| |
| /* |
| 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_header -> ll header |
| data -> data |
| |
| Outgoing, dev->hard_header!=NULL |
| mac_header -> ll header |
| data -> ll header |
| |
| Incoming, dev->hard_header==NULL |
| mac_header -> 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_header -> 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_header -> ll header |
| data -> ll header |
| |
| dev->hard_header == NULL (ll header is added by device, we cannot control it) |
| mac_header -> data |
| data -> data |
| |
| We should set nh.raw on output to correct posistion, |
| packet classifier depends on it. |
| */ |
| |
| /* Private packet socket structures. */ |
| |
| struct packet_mclist { |
| struct packet_mclist *next; |
| int ifindex; |
| int count; |
| unsigned short type; |
| unsigned short alen; |
| unsigned char addr[MAX_ADDR_LEN]; |
| }; |
| /* identical to struct packet_mreq except it has |
| * a longer address field. |
| */ |
| struct packet_mreq_max { |
| int mr_ifindex; |
| unsigned short mr_type; |
| unsigned short mr_alen; |
| unsigned char mr_address[MAX_ADDR_LEN]; |
| }; |
| |
| static int packet_set_ring(struct sock *sk, struct tpacket_req *req, |
| int closing, int tx_ring); |
| |
| struct pgv { |
| char *buffer; |
| }; |
| |
| struct packet_ring_buffer { |
| struct pgv *pg_vec; |
| unsigned int head; |
| unsigned int frames_per_block; |
| unsigned int frame_size; |
| unsigned int frame_max; |
| |
| unsigned int pg_vec_order; |
| unsigned int pg_vec_pages; |
| unsigned int pg_vec_len; |
| |
| atomic_t pending; |
| }; |
| |
| struct packet_sock; |
| static int tpacket_snd(struct packet_sock *po, struct msghdr *msg); |
| |
| 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; |
| struct packet_ring_buffer rx_ring; |
| struct packet_ring_buffer tx_ring; |
| int copy_thresh; |
| spinlock_t bind_lock; |
| struct mutex pg_vec_lock; |
| unsigned int running:1, /* prot_hook is attached*/ |
| auxdata:1, |
| origdev:1, |
| has_vnet_hdr:1; |
| int ifindex; /* bound device */ |
| __be16 num; |
| struct packet_mclist *mclist; |
| atomic_t mapped; |
| enum tpacket_versions tp_version; |
| unsigned int tp_hdrlen; |
| unsigned int tp_reserve; |
| unsigned int tp_loss:1; |
| unsigned int tp_tstamp; |
| struct packet_type prot_hook ____cacheline_aligned_in_smp; |
| }; |
| |
| struct packet_skb_cb { |
| unsigned int origlen; |
| union { |
| struct sockaddr_pkt pkt; |
| struct sockaddr_ll ll; |
| } sa; |
| }; |
| |
| #define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb)) |
| |
| static inline __pure struct page *pgv_to_page(void *addr) |
| { |
| if (is_vmalloc_addr(addr)) |
| return vmalloc_to_page(addr); |
| return virt_to_page(addr); |
| } |
| |
| static void __packet_set_status(struct packet_sock *po, void *frame, int status) |
| { |
| union { |
| struct tpacket_hdr *h1; |
| struct tpacket2_hdr *h2; |
| void *raw; |
| } h; |
| |
| h.raw = frame; |
| switch (po->tp_version) { |
| case TPACKET_V1: |
| h.h1->tp_status = status; |
| flush_dcache_page(pgv_to_page(&h.h1->tp_status)); |
| break; |
| case TPACKET_V2: |
| h.h2->tp_status = status; |
| flush_dcache_page(pgv_to_page(&h.h2->tp_status)); |
| break; |
| default: |
| pr_err("TPACKET version not supported\n"); |
| BUG(); |
| } |
| |
| smp_wmb(); |
| } |
| |
| static int __packet_get_status(struct packet_sock *po, void *frame) |
| { |
| union { |
| struct tpacket_hdr *h1; |
| struct tpacket2_hdr *h2; |
| void *raw; |
| } h; |
| |
| smp_rmb(); |
| |
| h.raw = frame; |
| switch (po->tp_version) { |
| case TPACKET_V1: |
| flush_dcache_page(pgv_to_page(&h.h1->tp_status)); |
| return h.h1->tp_status; |
| case TPACKET_V2: |
| flush_dcache_page(pgv_to_page(&h.h2->tp_status)); |
| return h.h2->tp_status; |
| default: |
| pr_err("TPACKET version not supported\n"); |
| BUG(); |
| return 0; |
| } |
| } |
| |
| static void *packet_lookup_frame(struct packet_sock *po, |
| struct packet_ring_buffer *rb, |
| unsigned int position, |
| int status) |
| { |
| unsigned int pg_vec_pos, frame_offset; |
| union { |
| struct tpacket_hdr *h1; |
| struct tpacket2_hdr *h2; |
| void *raw; |
| } h; |
| |
| pg_vec_pos = position / rb->frames_per_block; |
| frame_offset = position % rb->frames_per_block; |
| |
| h.raw = rb->pg_vec[pg_vec_pos].buffer + |
| (frame_offset * rb->frame_size); |
| |
| if (status != __packet_get_status(po, h.raw)) |
| return NULL; |
| |
| return h.raw; |
| } |
| |
| static inline void *packet_current_frame(struct packet_sock *po, |
| struct packet_ring_buffer *rb, |
| int status) |
| { |
| return packet_lookup_frame(po, rb, rb->head, status); |
| } |
| |
| static inline void *packet_previous_frame(struct packet_sock *po, |
| struct packet_ring_buffer *rb, |
| int status) |
| { |
| unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max; |
| return packet_lookup_frame(po, rb, previous, status); |
| } |
| |
| static inline void packet_increment_head(struct packet_ring_buffer *buff) |
| { |
| buff->head = buff->head != buff->frame_max ? buff->head+1 : 0; |
| } |
| |
| static inline struct packet_sock *pkt_sk(struct sock *sk) |
| { |
| return (struct packet_sock *)sk; |
| } |
| |
| static void packet_sock_destruct(struct sock *sk) |
| { |
| skb_queue_purge(&sk->sk_error_queue); |
| |
| WARN_ON(atomic_read(&sk->sk_rmem_alloc)); |
| WARN_ON(atomic_read(&sk->sk_wmem_alloc)); |
| |
| if (!sock_flag(sk, SOCK_DEAD)) { |
| pr_err("Attempt to release alive packet socket: %p\n", sk); |
| return; |
| } |
| |
| sk_refcnt_debug_dec(sk); |
| } |
| |
| |
| static const struct proto_ops packet_ops; |
| |
| static const struct proto_ops packet_ops_spkt; |
| |
| static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev, |
| struct packet_type *pt, struct net_device *orig_dev) |
| { |
| 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_header(skb) |
| * so that this procedure is noop. |
| */ |
| |
| if (skb->pkt_type == PACKET_LOOPBACK) |
| goto out; |
| |
| if (!net_eq(dev_net(dev), sock_net(sk))) |
| goto out; |
| |
| skb = skb_share_check(skb, GFP_ATOMIC); |
| if (skb == NULL) |
| goto oom; |
| |
| /* drop any routing info */ |
| skb_dst_drop(skb); |
| |
| /* drop conntrack reference */ |
| nf_reset(skb); |
| |
| spkt = &PACKET_SKB_CB(skb)->sa.pkt; |
| |
| skb_push(skb, skb->data - skb_mac_header(skb)); |
| |
| /* |
| * 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 = NULL; |
| struct net_device *dev; |
| __be16 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; |
| retry: |
| rcu_read_lock(); |
| dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device); |
| err = -ENODEV; |
| if (dev == NULL) |
| goto out_unlock; |
| |
| err = -ENETDOWN; |
| if (!(dev->flags & IFF_UP)) |
| 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 + VLAN_HLEN) |
| goto out_unlock; |
| |
| if (!skb) { |
| size_t reserved = LL_RESERVED_SPACE(dev); |
| unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0; |
| |
| rcu_read_unlock(); |
| skb = sock_wmalloc(sk, len + reserved, 0, GFP_KERNEL); |
| if (skb == NULL) |
| return -ENOBUFS; |
| /* 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, reserved); |
| skb_reset_network_header(skb); |
| |
| /* Try to align data part correctly */ |
| if (hhlen) { |
| skb->data -= hhlen; |
| skb->tail -= hhlen; |
| if (len < hhlen) |
| skb_reset_network_header(skb); |
| } |
| err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); |
| if (err) |
| goto out_free; |
| goto retry; |
| } |
| |
| if (len > (dev->mtu + dev->hard_header_len)) { |
| /* Earlier code assumed this would be a VLAN pkt, |
| * double-check this now that we have the actual |
| * packet in hand. |
| */ |
| struct ethhdr *ehdr; |
| skb_reset_mac_header(skb); |
| ehdr = eth_hdr(skb); |
| if (ehdr->h_proto != htons(ETH_P_8021Q)) { |
| err = -EMSGSIZE; |
| goto out_unlock; |
| } |
| } |
| |
| skb->protocol = proto; |
| skb->dev = dev; |
| skb->priority = sk->sk_priority; |
| skb->mark = sk->sk_mark; |
| err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags); |
| if (err < 0) |
| goto out_unlock; |
| |
| dev_queue_xmit(skb); |
| rcu_read_unlock(); |
| return len; |
| |
| out_unlock: |
| rcu_read_unlock(); |
| out_free: |
| kfree_skb(skb); |
| return err; |
| } |
| |
| static inline unsigned int run_filter(const struct sk_buff *skb, |
| const struct sock *sk, |
| unsigned int res) |
| { |
| struct sk_filter *filter; |
| |
| rcu_read_lock(); |
| filter = rcu_dereference(sk->sk_filter); |
| if (filter != NULL) |
| res = SK_RUN_FILTER(filter, skb); |
| rcu_read_unlock(); |
| |
| 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 net_device *orig_dev) |
| { |
| struct sock *sk; |
| struct sockaddr_ll *sll; |
| struct packet_sock *po; |
| u8 *skb_head = skb->data; |
| int skb_len = skb->len; |
| unsigned int snaplen, res; |
| |
| if (skb->pkt_type == PACKET_LOOPBACK) |
| goto drop; |
| |
| sk = pt->af_packet_priv; |
| po = pkt_sk(sk); |
| |
| if (!net_eq(dev_net(dev), sock_net(sk))) |
| goto drop; |
| |
| skb->dev = dev; |
| |
| if (dev->header_ops) { |
| /* The device has an explicit notion of ll header, |
| * exported to higher levels. |
| * |
| * Otherwise, the device hides details of its frame |
| * structure, so that corresponding packet head is |
| * never delivered to user. |
| */ |
| if (sk->sk_type != SOCK_DGRAM) |
| skb_push(skb, skb->data - skb_mac_header(skb)); |
| else if (skb->pkt_type == PACKET_OUTGOING) { |
| /* Special case: outgoing packets have ll header at head */ |
| skb_pull(skb, skb_network_offset(skb)); |
| } |
| } |
| |
| snaplen = skb->len; |
| |
| res = run_filter(skb, sk, snaplen); |
| if (!res) |
| 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; |
| } |
| |
| BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8 > |
| sizeof(skb->cb)); |
| |
| sll = &PACKET_SKB_CB(skb)->sa.ll; |
| sll->sll_family = AF_PACKET; |
| sll->sll_hatype = dev->type; |
| sll->sll_protocol = skb->protocol; |
| sll->sll_pkttype = skb->pkt_type; |
| if (unlikely(po->origdev)) |
| sll->sll_ifindex = orig_dev->ifindex; |
| else |
| sll->sll_ifindex = dev->ifindex; |
| |
| sll->sll_halen = dev_parse_header(skb, sll->sll_addr); |
| |
| PACKET_SKB_CB(skb)->origlen = skb->len; |
| |
| if (pskb_trim(skb, snaplen)) |
| goto drop_n_acct; |
| |
| skb_set_owner_r(skb, sk); |
| skb->dev = NULL; |
| skb_dst_drop(skb); |
| |
| /* drop conntrack reference */ |
| nf_reset(skb); |
| |
| spin_lock(&sk->sk_receive_queue.lock); |
| po->stats.tp_packets++; |
| skb->dropcount = atomic_read(&sk->sk_drops); |
| __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: |
| po->stats.tp_drops = atomic_inc_return(&sk->sk_drops); |
| |
| drop_n_restore: |
| if (skb_head != skb->data && skb_shared(skb)) { |
| skb->data = skb_head; |
| skb->len = skb_len; |
| } |
| drop: |
| consume_skb(skb); |
| return 0; |
| } |
| |
| static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, |
| struct packet_type *pt, struct net_device *orig_dev) |
| { |
| struct sock *sk; |
| struct packet_sock *po; |
| struct sockaddr_ll *sll; |
| union { |
| struct tpacket_hdr *h1; |
| struct tpacket2_hdr *h2; |
| void *raw; |
| } h; |
| u8 *skb_head = skb->data; |
| int skb_len = skb->len; |
| unsigned int snaplen, res; |
| unsigned long status = TP_STATUS_LOSING|TP_STATUS_USER; |
| unsigned short macoff, netoff, hdrlen; |
| struct sk_buff *copy_skb = NULL; |
| struct timeval tv; |
| struct timespec ts; |
| struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb); |
| |
| if (skb->pkt_type == PACKET_LOOPBACK) |
| goto drop; |
| |
| sk = pt->af_packet_priv; |
| po = pkt_sk(sk); |
| |
| if (!net_eq(dev_net(dev), sock_net(sk))) |
| goto drop; |
| |
| if (dev->header_ops) { |
| if (sk->sk_type != SOCK_DGRAM) |
| skb_push(skb, skb->data - skb_mac_header(skb)); |
| else if (skb->pkt_type == PACKET_OUTGOING) { |
| /* Special case: outgoing packets have ll header at head */ |
| skb_pull(skb, skb_network_offset(skb)); |
| } |
| } |
| |
| if (skb->ip_summed == CHECKSUM_PARTIAL) |
| status |= TP_STATUS_CSUMNOTREADY; |
| |
| snaplen = skb->len; |
| |
| res = run_filter(skb, sk, snaplen); |
| if (!res) |
| goto drop_n_restore; |
| if (snaplen > res) |
| snaplen = res; |
| |
| if (sk->sk_type == SOCK_DGRAM) { |
| macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 + |
| po->tp_reserve; |
| } else { |
| unsigned maclen = skb_network_offset(skb); |
| netoff = TPACKET_ALIGN(po->tp_hdrlen + |
| (maclen < 16 ? 16 : maclen)) + |
| po->tp_reserve; |
| macoff = netoff - maclen; |
| } |
| |
| if (macoff + snaplen > po->rx_ring.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->rx_ring.frame_size - macoff; |
| if ((int)snaplen < 0) |
| snaplen = 0; |
| } |
| |
| spin_lock(&sk->sk_receive_queue.lock); |
| h.raw = packet_current_frame(po, &po->rx_ring, TP_STATUS_KERNEL); |
| if (!h.raw) |
| goto ring_is_full; |
| packet_increment_head(&po->rx_ring); |
| 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); |
| |
| skb_copy_bits(skb, 0, h.raw + macoff, snaplen); |
| |
| switch (po->tp_version) { |
| case TPACKET_V1: |
| h.h1->tp_len = skb->len; |
| h.h1->tp_snaplen = snaplen; |
| h.h1->tp_mac = macoff; |
| h.h1->tp_net = netoff; |
| if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE) |
| && shhwtstamps->syststamp.tv64) |
| tv = ktime_to_timeval(shhwtstamps->syststamp); |
| else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE) |
| && shhwtstamps->hwtstamp.tv64) |
| tv = ktime_to_timeval(shhwtstamps->hwtstamp); |
| else if (skb->tstamp.tv64) |
| tv = ktime_to_timeval(skb->tstamp); |
| else |
| do_gettimeofday(&tv); |
| h.h1->tp_sec = tv.tv_sec; |
| h.h1->tp_usec = tv.tv_usec; |
| hdrlen = sizeof(*h.h1); |
| break; |
| case TPACKET_V2: |
| h.h2->tp_len = skb->len; |
| h.h2->tp_snaplen = snaplen; |
| h.h2->tp_mac = macoff; |
| h.h2->tp_net = netoff; |
| if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE) |
| && shhwtstamps->syststamp.tv64) |
| ts = ktime_to_timespec(shhwtstamps->syststamp); |
| else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE) |
| && shhwtstamps->hwtstamp.tv64) |
| ts = ktime_to_timespec(shhwtstamps->hwtstamp); |
| else if (skb->tstamp.tv64) |
| ts = ktime_to_timespec(skb->tstamp); |
| else |
| getnstimeofday(&ts); |
| h.h2->tp_sec = ts.tv_sec; |
| h.h2->tp_nsec = ts.tv_nsec; |
| if (vlan_tx_tag_present(skb)) { |
| h.h2->tp_vlan_tci = vlan_tx_tag_get(skb); |
| status |= TP_STATUS_VLAN_VALID; |
| } else { |
| h.h2->tp_vlan_tci = 0; |
| } |
| hdrlen = sizeof(*h.h2); |
| break; |
| default: |
| BUG(); |
| } |
| |
| sll = h.raw + TPACKET_ALIGN(hdrlen); |
| sll->sll_halen = dev_parse_header(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; |
| if (unlikely(po->origdev)) |
| sll->sll_ifindex = orig_dev->ifindex; |
| else |
| sll->sll_ifindex = dev->ifindex; |
| |
| __packet_set_status(po, h.raw, status); |
| smp_mb(); |
| #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1 |
| { |
| u8 *start, *end; |
| |
| end = (u8 *)PAGE_ALIGN((unsigned long)h.raw + macoff + snaplen); |
| for (start = h.raw; start < end; start += PAGE_SIZE) |
| flush_dcache_page(pgv_to_page(start)); |
| } |
| #endif |
| |
| 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); |
| kfree_skb(copy_skb); |
| goto drop_n_restore; |
| } |
| |
| static void tpacket_destruct_skb(struct sk_buff *skb) |
| { |
| struct packet_sock *po = pkt_sk(skb->sk); |
| void *ph; |
| |
| BUG_ON(skb == NULL); |
| |
| if (likely(po->tx_ring.pg_vec)) { |
| ph = skb_shinfo(skb)->destructor_arg; |
| BUG_ON(__packet_get_status(po, ph) != TP_STATUS_SENDING); |
| BUG_ON(atomic_read(&po->tx_ring.pending) == 0); |
| atomic_dec(&po->tx_ring.pending); |
| __packet_set_status(po, ph, TP_STATUS_AVAILABLE); |
| } |
| |
| sock_wfree(skb); |
| } |
| |
| static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb, |
| void *frame, struct net_device *dev, int size_max, |
| __be16 proto, unsigned char *addr) |
| { |
| union { |
| struct tpacket_hdr *h1; |
| struct tpacket2_hdr *h2; |
| void *raw; |
| } ph; |
| int to_write, offset, len, tp_len, nr_frags, len_max; |
| struct socket *sock = po->sk.sk_socket; |
| struct page *page; |
| void *data; |
| int err; |
| |
| ph.raw = frame; |
| |
| skb->protocol = proto; |
| skb->dev = dev; |
| skb->priority = po->sk.sk_priority; |
| skb->mark = po->sk.sk_mark; |
| skb_shinfo(skb)->destructor_arg = ph.raw; |
| |
| switch (po->tp_version) { |
| case TPACKET_V2: |
| tp_len = ph.h2->tp_len; |
| break; |
| default: |
| tp_len = ph.h1->tp_len; |
| break; |
| } |
| if (unlikely(tp_len > size_max)) { |
| pr_err("packet size is too long (%d > %d)\n", tp_len, size_max); |
| return -EMSGSIZE; |
| } |
| |
| skb_reserve(skb, LL_RESERVED_SPACE(dev)); |
| skb_reset_network_header(skb); |
| |
| data = ph.raw + po->tp_hdrlen - sizeof(struct sockaddr_ll); |
| to_write = tp_len; |
| |
| if (sock->type == SOCK_DGRAM) { |
| err = dev_hard_header(skb, dev, ntohs(proto), addr, |
| NULL, tp_len); |
| if (unlikely(err < 0)) |
| return -EINVAL; |
| } else if (dev->hard_header_len) { |
| /* net device doesn't like empty head */ |
| if (unlikely(tp_len <= dev->hard_header_len)) { |
| pr_err("packet size is too short (%d < %d)\n", |
| tp_len, dev->hard_header_len); |
| return -EINVAL; |
| } |
| |
| skb_push(skb, dev->hard_header_len); |
| err = skb_store_bits(skb, 0, data, |
| dev->hard_header_len); |
| if (unlikely(err)) |
| return err; |
| |
| data += dev->hard_header_len; |
| to_write -= dev->hard_header_len; |
| } |
| |
| err = -EFAULT; |
| offset = offset_in_page(data); |
| len_max = PAGE_SIZE - offset; |
| len = ((to_write > len_max) ? len_max : to_write); |
| |
| skb->data_len = to_write; |
| skb->len += to_write; |
| skb->truesize += to_write; |
| atomic_add(to_write, &po->sk.sk_wmem_alloc); |
| |
| while (likely(to_write)) { |
| nr_frags = skb_shinfo(skb)->nr_frags; |
| |
| if (unlikely(nr_frags >= MAX_SKB_FRAGS)) { |
| pr_err("Packet exceed the number of skb frags(%lu)\n", |
| MAX_SKB_FRAGS); |
| return -EFAULT; |
| } |
| |
| page = pgv_to_page(data); |
| data += len; |
| flush_dcache_page(page); |
| get_page(page); |
| skb_fill_page_desc(skb, nr_frags, page, offset, len); |
| to_write -= len; |
| offset = 0; |
| len_max = PAGE_SIZE; |
| len = ((to_write > len_max) ? len_max : to_write); |
| } |
| |
| return tp_len; |
| } |
| |
| static int tpacket_snd(struct packet_sock *po, struct msghdr *msg) |
| { |
| struct sk_buff *skb; |
| struct net_device *dev; |
| __be16 proto; |
| bool need_rls_dev = false; |
| int err, reserve = 0; |
| void *ph; |
| struct sockaddr_ll *saddr = (struct sockaddr_ll *)msg->msg_name; |
| int tp_len, size_max; |
| unsigned char *addr; |
| int len_sum = 0; |
| int status = 0; |
| |
| mutex_lock(&po->pg_vec_lock); |
| |
| err = -EBUSY; |
| if (saddr == NULL) { |
| dev = po->prot_hook.dev; |
| proto = po->num; |
| addr = NULL; |
| } else { |
| err = -EINVAL; |
| if (msg->msg_namelen < sizeof(struct sockaddr_ll)) |
| goto out; |
| if (msg->msg_namelen < (saddr->sll_halen |
| + offsetof(struct sockaddr_ll, |
| sll_addr))) |
| goto out; |
| proto = saddr->sll_protocol; |
| addr = saddr->sll_addr; |
| dev = dev_get_by_index(sock_net(&po->sk), saddr->sll_ifindex); |
| need_rls_dev = true; |
| } |
| |
| err = -ENXIO; |
| if (unlikely(dev == NULL)) |
| goto out; |
| |
| reserve = dev->hard_header_len; |
| |
| err = -ENETDOWN; |
| if (unlikely(!(dev->flags & IFF_UP))) |
| goto out_put; |
| |
| size_max = po->tx_ring.frame_size |
| - (po->tp_hdrlen - sizeof(struct sockaddr_ll)); |
| |
| if (size_max > dev->mtu + reserve) |
| size_max = dev->mtu + reserve; |
| |
| do { |
| ph = packet_current_frame(po, &po->tx_ring, |
| TP_STATUS_SEND_REQUEST); |
| |
| if (unlikely(ph == NULL)) { |
| schedule(); |
| continue; |
| } |
| |
| status = TP_STATUS_SEND_REQUEST; |
| skb = sock_alloc_send_skb(&po->sk, |
| LL_ALLOCATED_SPACE(dev) |
| + sizeof(struct sockaddr_ll), |
| 0, &err); |
| |
| if (unlikely(skb == NULL)) |
| goto out_status; |
| |
| tp_len = tpacket_fill_skb(po, skb, ph, dev, size_max, proto, |
| addr); |
| |
| if (unlikely(tp_len < 0)) { |
| if (po->tp_loss) { |
| __packet_set_status(po, ph, |
| TP_STATUS_AVAILABLE); |
| packet_increment_head(&po->tx_ring); |
| kfree_skb(skb); |
| continue; |
| } else { |
| status = TP_STATUS_WRONG_FORMAT; |
| err = tp_len; |
| goto out_status; |
| } |
| } |
| |
| skb->destructor = tpacket_destruct_skb; |
| __packet_set_status(po, ph, TP_STATUS_SENDING); |
| atomic_inc(&po->tx_ring.pending); |
| |
| status = TP_STATUS_SEND_REQUEST; |
| err = dev_queue_xmit(skb); |
| if (unlikely(err > 0)) { |
| err = net_xmit_errno(err); |
| if (err && __packet_get_status(po, ph) == |
| TP_STATUS_AVAILABLE) { |
| /* skb was destructed already */ |
| skb = NULL; |
| goto out_status; |
| } |
| /* |
| * skb was dropped but not destructed yet; |
| * let's treat it like congestion or err < 0 |
| */ |
| err = 0; |
| } |
| packet_increment_head(&po->tx_ring); |
| len_sum += tp_len; |
| } while (likely((ph != NULL) || |
| ((!(msg->msg_flags & MSG_DONTWAIT)) && |
| (atomic_read(&po->tx_ring.pending)))) |
| ); |
| |
| err = len_sum; |
| goto out_put; |
| |
| out_status: |
| __packet_set_status(po, ph, status); |
| kfree_skb(skb); |
| out_put: |
| if (need_rls_dev) |
| dev_put(dev); |
| out: |
| mutex_unlock(&po->pg_vec_lock); |
| return err; |
| } |
| |
| static inline struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad, |
| size_t reserve, size_t len, |
| size_t linear, int noblock, |
| int *err) |
| { |
| struct sk_buff *skb; |
| |
| /* Under a page? Don't bother with paged skb. */ |
| if (prepad + len < PAGE_SIZE || !linear) |
| linear = len; |
| |
| skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, |
| err); |
| if (!skb) |
| return NULL; |
| |
| skb_reserve(skb, reserve); |
| skb_put(skb, linear); |
| skb->data_len = len - linear; |
| skb->len += len - linear; |
| |
| return skb; |
| } |
| |
| static int packet_snd(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; |
| __be16 proto; |
| bool need_rls_dev = false; |
| unsigned char *addr; |
| int err, reserve = 0; |
| struct virtio_net_hdr vnet_hdr = { 0 }; |
| int offset = 0; |
| int vnet_hdr_len; |
| struct packet_sock *po = pkt_sk(sk); |
| unsigned short gso_type = 0; |
| |
| /* |
| * Get and verify the address. |
| */ |
| |
| if (saddr == NULL) { |
| dev = po->prot_hook.dev; |
| proto = po->num; |
| addr = NULL; |
| } else { |
| err = -EINVAL; |
| if (msg->msg_namelen < sizeof(struct sockaddr_ll)) |
| goto out; |
| if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr))) |
| goto out; |
| proto = saddr->sll_protocol; |
| addr = saddr->sll_addr; |
| dev = dev_get_by_index(sock_net(sk), saddr->sll_ifindex); |
| need_rls_dev = true; |
| } |
| |
| err = -ENXIO; |
| if (dev == NULL) |
| goto out_unlock; |
| if (sock->type == SOCK_RAW) |
| reserve = dev->hard_header_len; |
| |
| err = -ENETDOWN; |
| if (!(dev->flags & IFF_UP)) |
| goto out_unlock; |
| |
| if (po->has_vnet_hdr) { |
| vnet_hdr_len = sizeof(vnet_hdr); |
| |
| err = -EINVAL; |
| if (len < vnet_hdr_len) |
| goto out_unlock; |
| |
| len -= vnet_hdr_len; |
| |
| err = memcpy_fromiovec((void *)&vnet_hdr, msg->msg_iov, |
| vnet_hdr_len); |
| if (err < 0) |
| goto out_unlock; |
| |
| if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && |
| (vnet_hdr.csum_start + vnet_hdr.csum_offset + 2 > |
| vnet_hdr.hdr_len)) |
| vnet_hdr.hdr_len = vnet_hdr.csum_start + |
| vnet_hdr.csum_offset + 2; |
| |
| err = -EINVAL; |
| if (vnet_hdr.hdr_len > len) |
| goto out_unlock; |
| |
| if (vnet_hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
| switch (vnet_hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { |
| case VIRTIO_NET_HDR_GSO_TCPV4: |
| gso_type = SKB_GSO_TCPV4; |
| break; |
| case VIRTIO_NET_HDR_GSO_TCPV6: |
| gso_type = SKB_GSO_TCPV6; |
| break; |
| case VIRTIO_NET_HDR_GSO_UDP: |
| gso_type = SKB_GSO_UDP; |
| break; |
| default: |
| goto out_unlock; |
| } |
| |
| if (vnet_hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN) |
| gso_type |= SKB_GSO_TCP_ECN; |
| |
| if (vnet_hdr.gso_size == 0) |
| goto out_unlock; |
| |
| } |
| } |
| |
| err = -EMSGSIZE; |
| if (!gso_type && (len > dev->mtu + reserve + VLAN_HLEN)) |
| goto out_unlock; |
| |
| err = -ENOBUFS; |
| skb = packet_alloc_skb(sk, LL_ALLOCATED_SPACE(dev), |
| LL_RESERVED_SPACE(dev), len, vnet_hdr.hdr_len, |
| msg->msg_flags & MSG_DONTWAIT, &err); |
| if (skb == NULL) |
| goto out_unlock; |
| |
| skb_set_network_header(skb, reserve); |
| |
| err = -EINVAL; |
| if (sock->type == SOCK_DGRAM && |
| (offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len)) < 0) |
| goto out_free; |
| |
| /* Returns -EFAULT on error */ |
| err = skb_copy_datagram_from_iovec(skb, offset, msg->msg_iov, 0, len); |
| if (err) |
| goto out_free; |
| err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags); |
| if (err < 0) |
| goto out_free; |
| |
| if (!gso_type && (len > dev->mtu + reserve)) { |
| /* Earlier code assumed this would be a VLAN pkt, |
| * double-check this now that we have the actual |
| * packet in hand. |
| */ |
| struct ethhdr *ehdr; |
| skb_reset_mac_header(skb); |
| ehdr = eth_hdr(skb); |
| if (ehdr->h_proto != htons(ETH_P_8021Q)) { |
| err = -EMSGSIZE; |
| goto out_free; |
| } |
| } |
| |
| skb->protocol = proto; |
| skb->dev = dev; |
| skb->priority = sk->sk_priority; |
| skb->mark = sk->sk_mark; |
| |
| if (po->has_vnet_hdr) { |
| if (vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
| if (!skb_partial_csum_set(skb, vnet_hdr.csum_start, |
| vnet_hdr.csum_offset)) { |
| err = -EINVAL; |
| goto out_free; |
| } |
| } |
| |
| skb_shinfo(skb)->gso_size = vnet_hdr.gso_size; |
| skb_shinfo(skb)->gso_type = gso_type; |
| |
| /* Header must be checked, and gso_segs computed. */ |
| skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; |
| skb_shinfo(skb)->gso_segs = 0; |
| |
| len += vnet_hdr_len; |
| } |
| |
| /* |
| * Now send it |
| */ |
| |
| err = dev_queue_xmit(skb); |
| if (err > 0 && (err = net_xmit_errno(err)) != 0) |
| goto out_unlock; |
| |
| if (need_rls_dev) |
| dev_put(dev); |
| |
| return len; |
| |
| out_free: |
| kfree_skb(skb); |
| out_unlock: |
| if (dev && need_rls_dev) |
| dev_put(dev); |
| out: |
| return err; |
| } |
| |
| static int packet_sendmsg(struct kiocb *iocb, struct socket *sock, |
| struct msghdr *msg, size_t len) |
| { |
| struct sock *sk = sock->sk; |
| struct packet_sock *po = pkt_sk(sk); |
| if (po->tx_ring.pg_vec) |
| return tpacket_snd(po, msg); |
| else |
| return packet_snd(sock, msg, len); |
| } |
| |
| /* |
| * 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; |
| struct net *net; |
| struct tpacket_req req; |
| |
| if (!sk) |
| return 0; |
| |
| net = sock_net(sk); |
| po = pkt_sk(sk); |
| |
| spin_lock_bh(&net->packet.sklist_lock); |
| sk_del_node_init_rcu(sk); |
| sock_prot_inuse_add(net, sk->sk_prot, -1); |
| spin_unlock_bh(&net->packet.sklist_lock); |
| |
| spin_lock(&po->bind_lock); |
| if (po->running) { |
| /* |
| * Remove from protocol table |
| */ |
| po->running = 0; |
| po->num = 0; |
| __dev_remove_pack(&po->prot_hook); |
| __sock_put(sk); |
| } |
| if (po->prot_hook.dev) { |
| dev_put(po->prot_hook.dev); |
| po->prot_hook.dev = NULL; |
| } |
| spin_unlock(&po->bind_lock); |
| |
| packet_flush_mclist(sk); |
| |
| memset(&req, 0, sizeof(req)); |
| |
| if (po->rx_ring.pg_vec) |
| packet_set_ring(sk, &req, 1, 0); |
| |
| if (po->tx_ring.pg_vec) |
| packet_set_ring(sk, &req, 1, 1); |
| |
| synchronize_net(); |
| /* |
| * 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); |
| sk_refcnt_debug_release(sk); |
| |
| sock_put(sk); |
| return 0; |
| } |
| |
| /* |
| * Attach a packet hook. |
| */ |
| |
| static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 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; |
| if (po->prot_hook.dev) |
| dev_put(po->prot_hook.dev); |
| po->prot_hook.dev = dev; |
| |
| po->ifindex = dev ? dev->ifindex : 0; |
| |
| if (protocol == 0) |
| goto out_unlock; |
| |
| if (!dev || (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); |
| } |
| |
| out_unlock: |
| spin_unlock(&po->bind_lock); |
| release_sock(sk); |
| return 0; |
| } |
| |
| /* |
| * Bind a packet socket to a device |
| */ |
| |
| 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(sock_net(sk), name); |
| if (dev) |
| err = packet_do_bind(sk, dev, pkt_sk(sk)->num); |
| return err; |
| } |
| |
| 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(sock_net(sk), sll->sll_ifindex); |
| if (dev == NULL) |
| goto out; |
| } |
| err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num); |
| |
| 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 net *net, struct socket *sock, int protocol, |
| int kern) |
| { |
| struct sock *sk; |
| struct packet_sock *po; |
| __be16 proto = (__force __be16)protocol; /* weird, but documented */ |
| int err; |
| |
| if (!capable(CAP_NET_RAW)) |
| return -EPERM; |
| if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW && |
| sock->type != SOCK_PACKET) |
| return -ESOCKTNOSUPPORT; |
| |
| sock->state = SS_UNCONNECTED; |
| |
| err = -ENOBUFS; |
| sk = sk_alloc(net, PF_PACKET, GFP_KERNEL, &packet_proto); |
| if (sk == NULL) |
| goto out; |
| |
| sock->ops = &packet_ops; |
| if (sock->type == SOCK_PACKET) |
| sock->ops = &packet_ops_spkt; |
| |
| sock_init_data(sock, sk); |
| |
| po = pkt_sk(sk); |
| sk->sk_family = PF_PACKET; |
| po->num = proto; |
| |
| sk->sk_destruct = packet_sock_destruct; |
| sk_refcnt_debug_inc(sk); |
| |
| /* |
| * Attach a protocol block |
| */ |
| |
| spin_lock_init(&po->bind_lock); |
| mutex_init(&po->pg_vec_lock); |
| po->prot_hook.func = packet_rcv; |
| |
| if (sock->type == SOCK_PACKET) |
| po->prot_hook.func = packet_rcv_spkt; |
| |
| po->prot_hook.af_packet_priv = sk; |
| |
| if (proto) { |
| po->prot_hook.type = proto; |
| dev_add_pack(&po->prot_hook); |
| sock_hold(sk); |
| po->running = 1; |
| } |
| |
| spin_lock_bh(&net->packet.sklist_lock); |
| sk_add_node_rcu(sk, &net->packet.sklist); |
| sock_prot_inuse_add(net, &packet_proto, 1); |
| spin_unlock_bh(&net->packet.sklist_lock); |
| |
| return 0; |
| out: |
| return err; |
| } |
| |
| static int packet_recv_error(struct sock *sk, struct msghdr *msg, int len) |
| { |
| struct sock_exterr_skb *serr; |
| struct sk_buff *skb, *skb2; |
| int copied, err; |
| |
| err = -EAGAIN; |
| skb = skb_dequeue(&sk->sk_error_queue); |
| if (skb == NULL) |
| goto out; |
| |
| copied = skb->len; |
| if (copied > len) { |
| msg->msg_flags |= MSG_TRUNC; |
| copied = len; |
| } |
| err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); |
| if (err) |
| goto out_free_skb; |
| |
| sock_recv_timestamp(msg, sk, skb); |
| |
| serr = SKB_EXT_ERR(skb); |
| put_cmsg(msg, SOL_PACKET, PACKET_TX_TIMESTAMP, |
| sizeof(serr->ee), &serr->ee); |
| |
| msg->msg_flags |= MSG_ERRQUEUE; |
| err = copied; |
| |
| /* Reset and regenerate socket error */ |
| spin_lock_bh(&sk->sk_error_queue.lock); |
| sk->sk_err = 0; |
| if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) { |
| sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; |
| spin_unlock_bh(&sk->sk_error_queue.lock); |
| sk->sk_error_report(sk); |
| } else |
| spin_unlock_bh(&sk->sk_error_queue.lock); |
| |
| out_free_skb: |
| kfree_skb(skb); |
| 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; |
| struct sockaddr_ll *sll; |
| int vnet_hdr_len = 0; |
| |
| err = -EINVAL; |
| if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT|MSG_ERRQUEUE)) |
| goto out; |
| |
| #if 0 |
| /* What error should we return now? EUNATTACH? */ |
| if (pkt_sk(sk)->ifindex < 0) |
| return -ENODEV; |
| #endif |
| |
| if (flags & MSG_ERRQUEUE) { |
| err = packet_recv_error(sk, msg, len); |
| goto out; |
| } |
| |
| /* |
| * 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; |
| |
| if (pkt_sk(sk)->has_vnet_hdr) { |
| struct virtio_net_hdr vnet_hdr = { 0 }; |
| |
| err = -EINVAL; |
| vnet_hdr_len = sizeof(vnet_hdr); |
| if (len < vnet_hdr_len) |
| goto out_free; |
| |
| len -= vnet_hdr_len; |
| |
| if (skb_is_gso(skb)) { |
| struct skb_shared_info *sinfo = skb_shinfo(skb); |
| |
| /* This is a hint as to how much should be linear. */ |
| vnet_hdr.hdr_len = skb_headlen(skb); |
| vnet_hdr.gso_size = sinfo->gso_size; |
| if (sinfo->gso_type & SKB_GSO_TCPV4) |
| vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; |
| else if (sinfo->gso_type & SKB_GSO_TCPV6) |
| vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; |
| else if (sinfo->gso_type & SKB_GSO_UDP) |
| vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP; |
| else if (sinfo->gso_type & SKB_GSO_FCOE) |
| goto out_free; |
| else |
| BUG(); |
| if (sinfo->gso_type & SKB_GSO_TCP_ECN) |
| vnet_hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN; |
| } else |
| vnet_hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE; |
| |
| if (skb->ip_summed == CHECKSUM_PARTIAL) { |
| vnet_hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; |
| vnet_hdr.csum_start = skb_checksum_start_offset(skb); |
| vnet_hdr.csum_offset = skb->csum_offset; |
| } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) { |
| vnet_hdr.flags = VIRTIO_NET_HDR_F_DATA_VALID; |
| } /* else everything is zero */ |
| |
| err = memcpy_toiovec(msg->msg_iov, (void *)&vnet_hdr, |
| vnet_hdr_len); |
| if (err < 0) |
| goto out_free; |
| } |
| |
| /* |
| * If the address length field is there to be filled in, we fill |
| * it in now. |
| */ |
| |
| sll = &PACKET_SKB_CB(skb)->sa.ll; |
| if (sock->type == SOCK_PACKET) |
| msg->msg_namelen = sizeof(struct sockaddr_pkt); |
| else |
| msg->msg_namelen = sll->sll_halen + offsetof(struct sockaddr_ll, sll_addr); |
| |
| /* |
| * 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_ts_and_drops(msg, sk, skb); |
| |
| if (msg->msg_name) |
| memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa, |
| msg->msg_namelen); |
| |
| if (pkt_sk(sk)->auxdata) { |
| struct tpacket_auxdata aux; |
| |
| aux.tp_status = TP_STATUS_USER; |
| if (skb->ip_summed == CHECKSUM_PARTIAL) |
| aux.tp_status |= TP_STATUS_CSUMNOTREADY; |
| aux.tp_len = PACKET_SKB_CB(skb)->origlen; |
| aux.tp_snaplen = skb->len; |
| aux.tp_mac = 0; |
| aux.tp_net = skb_network_offset(skb); |
| if (vlan_tx_tag_present(skb)) { |
| aux.tp_vlan_tci = vlan_tx_tag_get(skb); |
| aux.tp_status |= TP_STATUS_VLAN_VALID; |
| } else { |
| aux.tp_vlan_tci = 0; |
| } |
| put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux); |
| } |
| |
| /* |
| * Free or return the buffer as appropriate. Again this |
| * hides all the races and re-entrancy issues from us. |
| */ |
| err = vnet_hdr_len + ((flags&MSG_TRUNC) ? skb->len : copied); |
| |
| out_free: |
| skb_free_datagram(sk, skb); |
| out: |
| return err; |
| } |
| |
| 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; |
| rcu_read_lock(); |
| dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex); |
| if (dev) |
| strncpy(uaddr->sa_data, dev->name, 14); |
| else |
| memset(uaddr->sa_data, 0, 14); |
| rcu_read_unlock(); |
| *uaddr_len = sizeof(*uaddr); |
| |
| return 0; |
| } |
| |
| 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); |
| DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr); |
| |
| if (peer) |
| return -EOPNOTSUPP; |
| |
| sll->sll_family = AF_PACKET; |
| sll->sll_ifindex = po->ifindex; |
| sll->sll_protocol = po->num; |
| sll->sll_pkttype = 0; |
| rcu_read_lock(); |
| dev = dev_get_by_index_rcu(sock_net(sk), 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); |
| } else { |
| sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */ |
| sll->sll_halen = 0; |
| } |
| rcu_read_unlock(); |
| *uaddr_len = offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen; |
| |
| return 0; |
| } |
| |
| static int packet_dev_mc(struct net_device *dev, struct packet_mclist *i, |
| int what) |
| { |
| switch (i->type) { |
| case PACKET_MR_MULTICAST: |
| if (i->alen != dev->addr_len) |
| return -EINVAL; |
| if (what > 0) |
| return dev_mc_add(dev, i->addr); |
| else |
| return dev_mc_del(dev, i->addr); |
| break; |
| case PACKET_MR_PROMISC: |
| return dev_set_promiscuity(dev, what); |
| break; |
| case PACKET_MR_ALLMULTI: |
| return dev_set_allmulti(dev, what); |
| break; |
| case PACKET_MR_UNICAST: |
| if (i->alen != dev->addr_len) |
| return -EINVAL; |
| if (what > 0) |
| return dev_uc_add(dev, i->addr); |
| else |
| return dev_uc_del(dev, i->addr); |
| break; |
| default: |
| break; |
| } |
| return 0; |
| } |
| |
| 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_max *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(sock_net(sk), mreq->mr_ifindex); |
| if (!dev) |
| goto done; |
| |
| err = -EINVAL; |
| if (mreq->mr_alen > dev->addr_len) |
| goto done; |
| |
| err = -ENOBUFS; |
| i = 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; |
| err = packet_dev_mc(dev, i, 1); |
| if (err) { |
| po->mclist = i->next; |
| kfree(i); |
| } |
| |
| done: |
| rtnl_unlock(); |
| return err; |
| } |
| |
| static int packet_mc_drop(struct sock *sk, struct packet_mreq_max *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(sock_net(sk), ml->ifindex); |
| if (dev) |
| packet_dev_mc(dev, ml, -1); |
| 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; |
| dev = __dev_get_by_index(sock_net(sk), ml->ifindex); |
| if (dev != NULL) |
| packet_dev_mc(dev, ml, -1); |
| kfree(ml); |
| } |
| rtnl_unlock(); |
| } |
| |
| static int |
| packet_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen) |
| { |
| struct sock *sk = sock->sk; |
| struct packet_sock *po = pkt_sk(sk); |
| int ret; |
| |
| if (level != SOL_PACKET) |
| return -ENOPROTOOPT; |
| |
| switch (optname) { |
| case PACKET_ADD_MEMBERSHIP: |
| case PACKET_DROP_MEMBERSHIP: |
| { |
| struct packet_mreq_max mreq; |
| int len = optlen; |
| memset(&mreq, 0, sizeof(mreq)); |
| if (len < sizeof(struct packet_mreq)) |
| return -EINVAL; |
| if (len > sizeof(mreq)) |
| len = sizeof(mreq); |
| if (copy_from_user(&mreq, optval, len)) |
| return -EFAULT; |
| if (len < (mreq.mr_alen + offsetof(struct packet_mreq, mr_address))) |
| return -EINVAL; |
| if (optname == PACKET_ADD_MEMBERSHIP) |
| ret = packet_mc_add(sk, &mreq); |
| else |
| ret = packet_mc_drop(sk, &mreq); |
| return ret; |
| } |
| |
| case PACKET_RX_RING: |
| case PACKET_TX_RING: |
| { |
| struct tpacket_req req; |
| |
| if (optlen < sizeof(req)) |
| return -EINVAL; |
| if (pkt_sk(sk)->has_vnet_hdr) |
| return -EINVAL; |
| if (copy_from_user(&req, optval, sizeof(req))) |
| return -EFAULT; |
| return packet_set_ring(sk, &req, 0, optname == PACKET_TX_RING); |
| } |
| 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; |
| } |
| case PACKET_VERSION: |
| { |
| int val; |
| |
| if (optlen != sizeof(val)) |
| return -EINVAL; |
| if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
| return -EBUSY; |
| if (copy_from_user(&val, optval, sizeof(val))) |
| return -EFAULT; |
| switch (val) { |
| case TPACKET_V1: |
| case TPACKET_V2: |
| po->tp_version = val; |
| return 0; |
| default: |
| return -EINVAL; |
| } |
| } |
| case PACKET_RESERVE: |
| { |
| unsigned int val; |
| |
| if (optlen != sizeof(val)) |
| return -EINVAL; |
| if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
| return -EBUSY; |
| if (copy_from_user(&val, optval, sizeof(val))) |
| return -EFAULT; |
| po->tp_reserve = val; |
| return 0; |
| } |
| case PACKET_LOSS: |
| { |
| unsigned int val; |
| |
| if (optlen != sizeof(val)) |
| return -EINVAL; |
| if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
| return -EBUSY; |
| if (copy_from_user(&val, optval, sizeof(val))) |
| return -EFAULT; |
| po->tp_loss = !!val; |
| return 0; |
| } |
| case PACKET_AUXDATA: |
| { |
| int val; |
| |
| if (optlen < sizeof(val)) |
| return -EINVAL; |
| if (copy_from_user(&val, optval, sizeof(val))) |
| return -EFAULT; |
| |
| po->auxdata = !!val; |
| return 0; |
| } |
| case PACKET_ORIGDEV: |
| { |
| int val; |
| |
| if (optlen < sizeof(val)) |
| return -EINVAL; |
| if (copy_from_user(&val, optval, sizeof(val))) |
| return -EFAULT; |
| |
| po->origdev = !!val; |
| return 0; |
| } |
| case PACKET_VNET_HDR: |
| { |
| int val; |
| |
| if (sock->type != SOCK_RAW) |
| return -EINVAL; |
| if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) |
| return -EBUSY; |
| if (optlen < sizeof(val)) |
| return -EINVAL; |
| if (copy_from_user(&val, optval, sizeof(val))) |
| return -EFAULT; |
| |
| po->has_vnet_hdr = !!val; |
| return 0; |
| } |
| case PACKET_TIMESTAMP: |
| { |
| int val; |
| |
| if (optlen != sizeof(val)) |
| return -EINVAL; |
| if (copy_from_user(&val, optval, sizeof(val))) |
| return -EFAULT; |
| |
| po->tp_tstamp = val; |
| return 0; |
| } |
| default: |
| return -ENOPROTOOPT; |
| } |
| } |
| |
| static int packet_getsockopt(struct socket *sock, int level, int optname, |
| char __user *optval, int __user *optlen) |
| { |
| int len; |
| int val; |
| struct sock *sk = sock->sk; |
| struct packet_sock *po = pkt_sk(sk); |
| void *data; |
| struct tpacket_stats st; |
| |
| if (level != SOL_PACKET) |
| return -ENOPROTOOPT; |
| |
| if (get_user(len, optlen)) |
| return -EFAULT; |
| |
| if (len < 0) |
| return -EINVAL; |
| |
| switch (optname) { |
| case PACKET_STATISTICS: |
| 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; |
| |
| data = &st; |
| break; |
| case PACKET_AUXDATA: |
| if (len > sizeof(int)) |
| len = sizeof(int); |
| val = po->auxdata; |
| |
| data = &val; |
| break; |
| case PACKET_ORIGDEV: |
| if (len > sizeof(int)) |
| len = sizeof(int); |
| val = po->origdev; |
| |
| data = &val; |
| break; |
| case PACKET_VNET_HDR: |
| if (len > sizeof(int)) |
| len = sizeof(int); |
| val = po->has_vnet_hdr; |
| |
| data = &val; |
| break; |
| case PACKET_VERSION: |
| if (len > sizeof(int)) |
| len = sizeof(int); |
| val = po->tp_version; |
| data = &val; |
| break; |
| case PACKET_HDRLEN: |
| if (len > sizeof(int)) |
| len = sizeof(int); |
| if (copy_from_user(&val, optval, len)) |
| return -EFAULT; |
| switch (val) { |
| case TPACKET_V1: |
| val = sizeof(struct tpacket_hdr); |
| break; |
| case TPACKET_V2: |
| val = sizeof(struct tpacket2_hdr); |
| break; |
| default: |
| return -EINVAL; |
| } |
| data = &val; |
| break; |
| case PACKET_RESERVE: |
| if (len > sizeof(unsigned int)) |
| len = sizeof(unsigned int); |
| val = po->tp_reserve; |
| data = &val; |
| break; |
| case PACKET_LOSS: |
| if (len > sizeof(unsigned int)) |
| len = sizeof(unsigned int); |
| val = po->tp_loss; |
| data = &val; |
| break; |
| case PACKET_TIMESTAMP: |
| if (len > sizeof(int)) |
| len = sizeof(int); |
| val = po->tp_tstamp; |
| data = &val; |
| break; |
| default: |
| return -ENOPROTOOPT; |
| } |
| |
| if (put_user(len, optlen)) |
| return -EFAULT; |
| if (copy_to_user(optval, data, len)) |
| 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 = data; |
| struct net *net = dev_net(dev); |
| |
| rcu_read_lock(); |
| sk_for_each_rcu(sk, node, &net->packet.sklist) { |
| struct packet_sock *po = pkt_sk(sk); |
| |
| switch (msg) { |
| case NETDEV_UNREGISTER: |
| if (po->mclist) |
| packet_dev_mclist(dev, po->mclist, -1); |
| /* fallthrough */ |
| |
| 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; |
| if (po->prot_hook.dev) |
| dev_put(po->prot_hook.dev); |
| po->prot_hook.dev = NULL; |
| } |
| spin_unlock(&po->bind_lock); |
| } |
| break; |
| case NETDEV_UP: |
| if (dev->ifindex == po->ifindex) { |
| spin_lock(&po->bind_lock); |
| if (po->num && !po->running) { |
| dev_add_pack(&po->prot_hook); |
| sock_hold(sk); |
| po->running = 1; |
| } |
| spin_unlock(&po->bind_lock); |
| } |
| break; |
| } |
| } |
| rcu_read_unlock(); |
| 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 = sk_wmem_alloc_get(sk); |
| |
| 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); |
| case SIOCGSTAMPNS: |
| return sock_get_timestampns(sk, (struct timespec __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 -ENOIOCTLCMD; |
| } |
| return 0; |
| } |
| |
| 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->rx_ring.pg_vec) { |
| if (!packet_previous_frame(po, &po->rx_ring, TP_STATUS_KERNEL)) |
| mask |= POLLIN | POLLRDNORM; |
| } |
| spin_unlock_bh(&sk->sk_receive_queue.lock); |
| spin_lock_bh(&sk->sk_write_queue.lock); |
| if (po->tx_ring.pg_vec) { |
| if (packet_current_frame(po, &po->tx_ring, TP_STATUS_AVAILABLE)) |
| mask |= POLLOUT | POLLWRNORM; |
| } |
| spin_unlock_bh(&sk->sk_write_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 socket *sock = file->private_data; |
| 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 socket *sock = file->private_data; |
| struct sock *sk = sock->sk; |
| |
| if (sk) |
| atomic_dec(&pkt_sk(sk)->mapped); |
| } |
| |
| static const struct vm_operations_struct packet_mmap_ops = { |
| .open = packet_mm_open, |
| .close = packet_mm_close, |
| }; |
| |
| static void free_pg_vec(struct pgv *pg_vec, unsigned int order, |
| unsigned int len) |
| { |
| int i; |
| |
| for (i = 0; i < len; i++) { |
| if (likely(pg_vec[i].buffer)) { |
| if (is_vmalloc_addr(pg_vec[i].buffer)) |
| vfree(pg_vec[i].buffer); |
| else |
| free_pages((unsigned long)pg_vec[i].buffer, |
| order); |
| pg_vec[i].buffer = NULL; |
| } |
| } |
| kfree(pg_vec); |
| } |
| |
| static inline char *alloc_one_pg_vec_page(unsigned long order) |
| { |
| char *buffer = NULL; |
| gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP | |
| __GFP_ZERO | __GFP_NOWARN | __GFP_NORETRY; |
| |
| buffer = (char *) __get_free_pages(gfp_flags, order); |
| |
| if (buffer) |
| return buffer; |
| |
| /* |
| * __get_free_pages failed, fall back to vmalloc |
| */ |
| buffer = vzalloc((1 << order) * PAGE_SIZE); |
| |
| if (buffer) |
| return buffer; |
| |
| /* |
| * vmalloc failed, lets dig into swap here |
| */ |
| gfp_flags &= ~__GFP_NORETRY; |
| buffer = (char *)__get_free_pages(gfp_flags, order); |
| if (buffer) |
| return buffer; |
| |
| /* |
| * complete and utter failure |
| */ |
| return NULL; |
| } |
| |
| static struct pgv *alloc_pg_vec(struct tpacket_req *req, int order) |
| { |
| unsigned int block_nr = req->tp_block_nr; |
| struct pgv *pg_vec; |
| int i; |
| |
| pg_vec = kcalloc(block_nr, sizeof(struct pgv), GFP_KERNEL); |
| if (unlikely(!pg_vec)) |
| goto out; |
| |
| for (i = 0; i < block_nr; i++) { |
| pg_vec[i].buffer = alloc_one_pg_vec_page(order); |
| if (unlikely(!pg_vec[i].buffer)) |
| goto out_free_pgvec; |
| } |
| |
| out: |
| return pg_vec; |
| |
| out_free_pgvec: |
| free_pg_vec(pg_vec, order, block_nr); |
| pg_vec = NULL; |
| goto out; |
| } |
| |
| static int packet_set_ring(struct sock *sk, struct tpacket_req *req, |
| int closing, int tx_ring) |
| { |
| struct pgv *pg_vec = NULL; |
| struct packet_sock *po = pkt_sk(sk); |
| int was_running, order = 0; |
| struct packet_ring_buffer *rb; |
| struct sk_buff_head *rb_queue; |
| __be16 num; |
| int err; |
| |
| rb = tx_ring ? &po->tx_ring : &po->rx_ring; |
| rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue; |
| |
| err = -EBUSY; |
| if (!closing) { |
| if (atomic_read(&po->mapped)) |
| goto out; |
| if (atomic_read(&rb->pending)) |
| goto out; |
| } |
| |
| if (req->tp_block_nr) { |
| /* Sanity tests and some calculations */ |
| err = -EBUSY; |
| if (unlikely(rb->pg_vec)) |
| goto out; |
| |
| switch (po->tp_version) { |
| case TPACKET_V1: |
| po->tp_hdrlen = TPACKET_HDRLEN; |
| break; |
| case TPACKET_V2: |
| po->tp_hdrlen = TPACKET2_HDRLEN; |
| break; |
| } |
| |
| err = -EINVAL; |
| if (unlikely((int)req->tp_block_size <= 0)) |
| goto out; |
| if (unlikely(req->tp_block_size & (PAGE_SIZE - 1))) |
| goto out; |
| if (unlikely(req->tp_frame_size < po->tp_hdrlen + |
| po->tp_reserve)) |
| goto out; |
| if (unlikely(req->tp_frame_size & (TPACKET_ALIGNMENT - 1))) |
| goto out; |
| |
| rb->frames_per_block = req->tp_block_size/req->tp_frame_size; |
| if (unlikely(rb->frames_per_block <= 0)) |
| goto out; |
| if (unlikely((rb->frames_per_block * req->tp_block_nr) != |
| req->tp_frame_nr)) |
| goto out; |
| |
| err = -ENOMEM; |
| order = get_order(req->tp_block_size); |
| pg_vec = alloc_pg_vec(req, order); |
| if (unlikely(!pg_vec)) |
| goto out; |
| } |
| /* Done */ |
| else { |
| err = -EINVAL; |
| if (unlikely(req->tp_frame_nr)) |
| goto out; |
| } |
| |
| 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; |
| mutex_lock(&po->pg_vec_lock); |
| if (closing || atomic_read(&po->mapped) == 0) { |
| err = 0; |
| spin_lock_bh(&rb_queue->lock); |
| swap(rb->pg_vec, pg_vec); |
| rb->frame_max = (req->tp_frame_nr - 1); |
| rb->head = 0; |
| rb->frame_size = req->tp_frame_size; |
| spin_unlock_bh(&rb_queue->lock); |
| |
| swap(rb->pg_vec_order, order); |
| swap(rb->pg_vec_len, req->tp_block_nr); |
| |
| rb->pg_vec_pages = req->tp_block_size/PAGE_SIZE; |
| po->prot_hook.func = (po->rx_ring.pg_vec) ? |
| tpacket_rcv : packet_rcv; |
| skb_queue_purge(rb_queue); |
| if (atomic_read(&po->mapped)) |
| pr_err("packet_mmap: vma is busy: %d\n", |
| atomic_read(&po->mapped)); |
| } |
| mutex_unlock(&po->pg_vec_lock); |
| |
| 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); |
| |
| 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, expected_size; |
| struct packet_ring_buffer *rb; |
| unsigned long start; |
| int err = -EINVAL; |
| int i; |
| |
| if (vma->vm_pgoff) |
| return -EINVAL; |
| |
| mutex_lock(&po->pg_vec_lock); |
| |
| expected_size = 0; |
| for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) { |
| if (rb->pg_vec) { |
| expected_size += rb->pg_vec_len |
| * rb->pg_vec_pages |
| * PAGE_SIZE; |
| } |
| } |
| |
| if (expected_size == 0) |
| goto out; |
| |
| size = vma->vm_end - vma->vm_start; |
| if (size != expected_size) |
| goto out; |
| |
| start = vma->vm_start; |
| for (rb = &po->rx_ring; rb <= &po->tx_ring; rb++) { |
| if (rb->pg_vec == NULL) |
| continue; |
| |
| for (i = 0; i < rb->pg_vec_len; i++) { |
| struct page *page; |
| void *kaddr = rb->pg_vec[i].buffer; |
| int pg_num; |
| |
| for (pg_num = 0; pg_num < rb->pg_vec_pages; pg_num++) { |
| page = pgv_to_page(kaddr); |
| err = vm_insert_page(vma, start, page); |
| if (unlikely(err)) |
| goto out; |
| start += PAGE_SIZE; |
| kaddr += PAGE_SIZE; |
| } |
| } |
| } |
| |
| atomic_inc(&po->mapped); |
| vma->vm_ops = &packet_mmap_ops; |
| err = 0; |
| |
| out: |
| mutex_unlock(&po->pg_vec_lock); |
| return err; |
| } |
| |
| static const 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, |
| }; |
| |
| static const 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 const 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 void *packet_seq_start(struct seq_file *seq, loff_t *pos) |
| __acquires(RCU) |
| { |
| struct net *net = seq_file_net(seq); |
| |
| rcu_read_lock(); |
| return seq_hlist_start_head_rcu(&net->packet.sklist, *pos); |
| } |
| |
| static void *packet_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| { |
| struct net *net = seq_file_net(seq); |
| return seq_hlist_next_rcu(v, &net->packet.sklist, pos); |
| } |
| |
| static void packet_seq_stop(struct seq_file *seq, void *v) |
| __releases(RCU) |
| { |
| rcu_read_unlock(); |
| } |
| |
| 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 = sk_entry(v); |
| const struct packet_sock *po = pkt_sk(s); |
| |
| seq_printf(seq, |
| "%pK %-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 const 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_net(inode, file, &packet_seq_ops, |
| sizeof(struct seq_net_private)); |
| } |
| |
| static const struct file_operations packet_seq_fops = { |
| .owner = THIS_MODULE, |
| .open = packet_seq_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = seq_release_net, |
| }; |
| |
| #endif |
| |
| static int __net_init packet_net_init(struct net *net) |
| { |
| spin_lock_init(&net->packet.sklist_lock); |
| INIT_HLIST_HEAD(&net->packet.sklist); |
| |
| if (!proc_net_fops_create(net, "packet", 0, &packet_seq_fops)) |
| return -ENOMEM; |
| |
| return 0; |
| } |
| |
| static void __net_exit packet_net_exit(struct net *net) |
| { |
| proc_net_remove(net, "packet"); |
| } |
| |
| static struct pernet_operations packet_net_ops = { |
| .init = packet_net_init, |
| .exit = packet_net_exit, |
| }; |
| |
| |
| static void __exit packet_exit(void) |
| { |
| unregister_netdevice_notifier(&packet_netdev_notifier); |
| unregister_pernet_subsys(&packet_net_ops); |
| 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_pernet_subsys(&packet_net_ops); |
| register_netdevice_notifier(&packet_netdev_notifier); |
| out: |
| return rc; |
| } |
| |
| module_init(packet_init); |
| module_exit(packet_exit); |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS_NETPROTO(PF_PACKET); |