mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-09 17:36:39 +07:00
87eb367003
Conflicts: drivers/net/wireless/iwlwifi/iwl-6000.c net/core/dev.c
2692 lines
59 KiB
C
2692 lines
59 KiB
C
/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* PACKET - implements raw packet sockets.
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*
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* Authors: Ross Biro
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* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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* Alan Cox, <gw4pts@gw4pts.ampr.org>
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*
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* Fixes:
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* Alan Cox : verify_area() now used correctly
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* Alan Cox : new skbuff lists, look ma no backlogs!
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* Alan Cox : tidied skbuff lists.
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* Alan Cox : Now uses generic datagram routines I
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* added. Also fixed the peek/read crash
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* from all old Linux datagram code.
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* Alan Cox : Uses the improved datagram code.
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* Alan Cox : Added NULL's for socket options.
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* Alan Cox : Re-commented the code.
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* Alan Cox : Use new kernel side addressing
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* Rob Janssen : Correct MTU usage.
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* Dave Platt : Counter leaks caused by incorrect
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* interrupt locking and some slightly
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* dubious gcc output. Can you read
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* compiler: it said _VOLATILE_
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* Richard Kooijman : Timestamp fixes.
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* Alan Cox : New buffers. Use sk->mac.raw.
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* Alan Cox : sendmsg/recvmsg support.
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* Alan Cox : Protocol setting support
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* Alexey Kuznetsov : Untied from IPv4 stack.
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* Cyrus Durgin : Fixed kerneld for kmod.
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* Michal Ostrowski : Module initialization cleanup.
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* Ulises Alonso : Frame number limit removal and
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* packet_set_ring memory leak.
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* Eric Biederman : Allow for > 8 byte hardware addresses.
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* The convention is that longer addresses
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* will simply extend the hardware address
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* byte arrays at the end of sockaddr_ll
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* and packet_mreq.
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* Johann Baudy : Added TX RING.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#include <linux/types.h>
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#include <linux/mm.h>
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#include <linux/capability.h>
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#include <linux/fcntl.h>
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#include <linux/socket.h>
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#include <linux/in.h>
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#include <linux/inet.h>
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#include <linux/netdevice.h>
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#include <linux/if_packet.h>
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#include <linux/wireless.h>
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#include <linux/kernel.h>
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#include <linux/kmod.h>
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#include <linux/slab.h>
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#include <net/net_namespace.h>
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#include <net/ip.h>
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#include <net/protocol.h>
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#include <linux/skbuff.h>
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#include <net/sock.h>
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#include <linux/errno.h>
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#include <linux/timer.h>
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#include <asm/system.h>
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#include <asm/uaccess.h>
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#include <asm/ioctls.h>
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#include <asm/page.h>
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#include <asm/cacheflush.h>
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#include <asm/io.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/poll.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/mutex.h>
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#include <linux/if_vlan.h>
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#include <linux/virtio_net.h>
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#include <linux/errqueue.h>
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#ifdef CONFIG_INET
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#include <net/inet_common.h>
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#endif
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/*
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Assumptions:
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- if device has no dev->hard_header routine, it adds and removes ll header
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inside itself. In this case ll header is invisible outside of device,
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but higher levels still should reserve dev->hard_header_len.
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Some devices are enough clever to reallocate skb, when header
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will not fit to reserved space (tunnel), another ones are silly
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(PPP).
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- packet socket receives packets with pulled ll header,
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so that SOCK_RAW should push it back.
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On receive:
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-----------
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Incoming, dev->hard_header!=NULL
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mac_header -> ll header
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data -> data
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Outgoing, dev->hard_header!=NULL
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mac_header -> ll header
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data -> ll header
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Incoming, dev->hard_header==NULL
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mac_header -> UNKNOWN position. It is very likely, that it points to ll
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header. PPP makes it, that is wrong, because introduce
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assymetry between rx and tx paths.
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data -> data
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Outgoing, dev->hard_header==NULL
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mac_header -> data. ll header is still not built!
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data -> data
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Resume
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If dev->hard_header==NULL we are unlikely to restore sensible ll header.
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On transmit:
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------------
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dev->hard_header != NULL
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mac_header -> ll header
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data -> ll header
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dev->hard_header == NULL (ll header is added by device, we cannot control it)
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mac_header -> data
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data -> data
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We should set nh.raw on output to correct posistion,
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packet classifier depends on it.
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*/
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/* Private packet socket structures. */
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struct packet_mclist {
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struct packet_mclist *next;
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int ifindex;
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int count;
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unsigned short type;
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unsigned short alen;
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unsigned char addr[MAX_ADDR_LEN];
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};
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/* identical to struct packet_mreq except it has
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* a longer address field.
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*/
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struct packet_mreq_max {
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int mr_ifindex;
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unsigned short mr_type;
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unsigned short mr_alen;
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unsigned char mr_address[MAX_ADDR_LEN];
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};
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static int packet_set_ring(struct sock *sk, struct tpacket_req *req,
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int closing, int tx_ring);
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struct packet_ring_buffer {
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char **pg_vec;
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unsigned int head;
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unsigned int frames_per_block;
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unsigned int frame_size;
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unsigned int frame_max;
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unsigned int pg_vec_order;
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unsigned int pg_vec_pages;
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unsigned int pg_vec_len;
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atomic_t pending;
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};
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struct packet_sock;
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static int tpacket_snd(struct packet_sock *po, struct msghdr *msg);
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static void packet_flush_mclist(struct sock *sk);
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struct packet_sock {
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/* struct sock has to be the first member of packet_sock */
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struct sock sk;
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struct tpacket_stats stats;
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struct packet_ring_buffer rx_ring;
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struct packet_ring_buffer tx_ring;
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int copy_thresh;
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spinlock_t bind_lock;
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struct mutex pg_vec_lock;
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unsigned int running:1, /* prot_hook is attached*/
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auxdata:1,
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origdev:1,
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has_vnet_hdr:1;
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int ifindex; /* bound device */
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__be16 num;
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struct packet_mclist *mclist;
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atomic_t mapped;
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enum tpacket_versions tp_version;
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unsigned int tp_hdrlen;
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unsigned int tp_reserve;
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unsigned int tp_loss:1;
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struct packet_type prot_hook ____cacheline_aligned_in_smp;
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};
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struct packet_skb_cb {
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unsigned int origlen;
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union {
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struct sockaddr_pkt pkt;
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struct sockaddr_ll ll;
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} sa;
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};
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#define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb))
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static void __packet_set_status(struct packet_sock *po, void *frame, int status)
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{
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union {
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struct tpacket_hdr *h1;
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struct tpacket2_hdr *h2;
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void *raw;
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} h;
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h.raw = frame;
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switch (po->tp_version) {
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case TPACKET_V1:
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h.h1->tp_status = status;
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flush_dcache_page(virt_to_page(&h.h1->tp_status));
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break;
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case TPACKET_V2:
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h.h2->tp_status = status;
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flush_dcache_page(virt_to_page(&h.h2->tp_status));
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break;
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default:
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pr_err("TPACKET version not supported\n");
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BUG();
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}
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smp_wmb();
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}
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static int __packet_get_status(struct packet_sock *po, void *frame)
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{
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union {
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struct tpacket_hdr *h1;
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struct tpacket2_hdr *h2;
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void *raw;
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} h;
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smp_rmb();
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h.raw = frame;
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switch (po->tp_version) {
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case TPACKET_V1:
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flush_dcache_page(virt_to_page(&h.h1->tp_status));
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return h.h1->tp_status;
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case TPACKET_V2:
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flush_dcache_page(virt_to_page(&h.h2->tp_status));
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return h.h2->tp_status;
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default:
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pr_err("TPACKET version not supported\n");
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BUG();
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return 0;
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}
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}
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static void *packet_lookup_frame(struct packet_sock *po,
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struct packet_ring_buffer *rb,
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unsigned int position,
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int status)
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{
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unsigned int pg_vec_pos, frame_offset;
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union {
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struct tpacket_hdr *h1;
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struct tpacket2_hdr *h2;
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void *raw;
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} h;
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pg_vec_pos = position / rb->frames_per_block;
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frame_offset = position % rb->frames_per_block;
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h.raw = rb->pg_vec[pg_vec_pos] + (frame_offset * rb->frame_size);
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if (status != __packet_get_status(po, h.raw))
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return NULL;
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return h.raw;
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}
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static inline void *packet_current_frame(struct packet_sock *po,
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struct packet_ring_buffer *rb,
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int status)
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{
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return packet_lookup_frame(po, rb, rb->head, status);
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}
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static inline void *packet_previous_frame(struct packet_sock *po,
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struct packet_ring_buffer *rb,
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int status)
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{
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unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max;
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return packet_lookup_frame(po, rb, previous, status);
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}
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static inline void packet_increment_head(struct packet_ring_buffer *buff)
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{
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buff->head = buff->head != buff->frame_max ? buff->head+1 : 0;
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}
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static inline struct packet_sock *pkt_sk(struct sock *sk)
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{
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return (struct packet_sock *)sk;
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}
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static void packet_sock_destruct(struct sock *sk)
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{
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skb_queue_purge(&sk->sk_error_queue);
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WARN_ON(atomic_read(&sk->sk_rmem_alloc));
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WARN_ON(atomic_read(&sk->sk_wmem_alloc));
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if (!sock_flag(sk, SOCK_DEAD)) {
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pr_err("Attempt to release alive packet socket: %p\n", sk);
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return;
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}
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|
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sk_refcnt_debug_dec(sk);
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}
|
|
|
|
|
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static const struct proto_ops packet_ops;
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static const struct proto_ops packet_ops_spkt;
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static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev,
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struct packet_type *pt, struct net_device *orig_dev)
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{
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struct sock *sk;
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struct sockaddr_pkt *spkt;
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|
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/*
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* When we registered the protocol we saved the socket in the data
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* field for just this event.
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*/
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sk = pt->af_packet_priv;
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|
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/*
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* Yank back the headers [hope the device set this
|
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* right or kerboom...]
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*
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* Incoming packets have ll header pulled,
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* push it back.
|
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*
|
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* For outgoing ones skb->data == skb_mac_header(skb)
|
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* so that this procedure is noop.
|
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*/
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|
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if (skb->pkt_type == PACKET_LOOPBACK)
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goto out;
|
|
|
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if (!net_eq(dev_net(dev), sock_net(sk)))
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goto out;
|
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|
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skb = skb_share_check(skb, GFP_ATOMIC);
|
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if (skb == NULL)
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goto oom;
|
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|
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/* drop any routing info */
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skb_dst_drop(skb);
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|
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/* drop conntrack reference */
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nf_reset(skb);
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|
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spkt = &PACKET_SKB_CB(skb)->sa.pkt;
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|
|
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skb_push(skb, skb->data - skb_mac_header(skb));
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|
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/*
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* The SOCK_PACKET socket receives _all_ frames.
|
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*/
|
|
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spkt->spkt_family = dev->type;
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strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device));
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spkt->spkt_protocol = skb->protocol;
|
|
|
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/*
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* Charge the memory to the socket. This is done specifically
|
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* to prevent sockets using all the memory up.
|
|
*/
|
|
|
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if (sock_queue_rcv_skb(sk, skb) == 0)
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return 0;
|
|
|
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out:
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kfree_skb(skb);
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oom:
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return 0;
|
|
}
|
|
|
|
|
|
/*
|
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* Output a raw packet to a device layer. This bypasses all the other
|
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* protocol layers and you must therefore supply it with a complete frame
|
|
*/
|
|
|
|
static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock,
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struct msghdr *msg, size_t len)
|
|
{
|
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struct sock *sk = sock->sk;
|
|
struct sockaddr_pkt *saddr = (struct sockaddr_pkt *)msg->msg_name;
|
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struct sk_buff *skb = NULL;
|
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struct net_device *dev;
|
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__be16 proto = 0;
|
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int err;
|
|
|
|
/*
|
|
* Get and verify the address.
|
|
*/
|
|
|
|
if (saddr) {
|
|
if (msg->msg_namelen < sizeof(struct sockaddr))
|
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return -EINVAL;
|
|
if (msg->msg_namelen == sizeof(struct sockaddr_pkt))
|
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proto = saddr->spkt_protocol;
|
|
} else
|
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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)
|
|
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;
|
|
}
|
|
|
|
|
|
skb->protocol = proto;
|
|
skb->dev = dev;
|
|
skb->priority = sk->sk_priority;
|
|
skb->mark = sk->sk_mark;
|
|
err = sock_tx_timestamp(msg, sk, skb_tx(skb));
|
|
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(struct sk_buff *skb, struct sock *sk,
|
|
unsigned int res)
|
|
{
|
|
struct sk_filter *filter;
|
|
|
|
rcu_read_lock_bh();
|
|
filter = rcu_dereference_bh(sk->sk_filter);
|
|
if (filter != NULL)
|
|
res = sk_run_filter(skb, filter->insns, filter->len);
|
|
rcu_read_unlock_bh();
|
|
|
|
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 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_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;
|
|
|
|
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 (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 (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;
|
|
h.h2->tp_vlan_tci = vlan_tx_tag_get(skb);
|
|
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();
|
|
{
|
|
struct page *p_start, *p_end;
|
|
u8 *h_end = h.raw + macoff + snaplen - 1;
|
|
|
|
p_start = virt_to_page(h.raw);
|
|
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);
|
|
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;
|
|
page = virt_to_page(data);
|
|
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;
|
|
}
|
|
|
|
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 socket *sock;
|
|
struct sk_buff *skb;
|
|
struct net_device *dev;
|
|
__be16 proto;
|
|
int ifindex, 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;
|
|
|
|
sock = po->sk.sk_socket;
|
|
|
|
mutex_lock(&po->pg_vec_lock);
|
|
|
|
err = -EBUSY;
|
|
if (saddr == NULL) {
|
|
ifindex = po->ifindex;
|
|
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;
|
|
ifindex = saddr->sll_ifindex;
|
|
proto = saddr->sll_protocol;
|
|
addr = saddr->sll_addr;
|
|
}
|
|
|
|
dev = dev_get_by_index(sock_net(&po->sk), ifindex);
|
|
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:
|
|
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;
|
|
unsigned char *addr;
|
|
int ifindex, 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) {
|
|
ifindex = po->ifindex;
|
|
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;
|
|
ifindex = saddr->sll_ifindex;
|
|
proto = saddr->sll_protocol;
|
|
addr = saddr->sll_addr;
|
|
}
|
|
|
|
|
|
dev = dev_get_by_index(sock_net(sk), ifindex);
|
|
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))
|
|
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(msg, sk, skb_tx(skb));
|
|
if (err < 0)
|
|
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;
|
|
|
|
dev_put(dev);
|
|
|
|
return len;
|
|
|
|
out_free:
|
|
kfree_skb(skb);
|
|
out_unlock:
|
|
if (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);
|
|
}
|
|
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;
|
|
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);
|
|
dev_put(dev);
|
|
}
|
|
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);
|
|
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 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) < 0)
|
|
goto out_free;
|
|
|
|
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->csum_start -
|
|
skb_headroom(skb);
|
|
vnet_hdr.csum_offset = skb->csum_offset;
|
|
} /* 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);
|
|
aux.tp_vlan_tci = vlan_tx_tag_get(skb);
|
|
|
|
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)
|
|
strlcpy(uaddr->sa_data, dev->name, 15);
|
|
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;
|
|
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;
|
|
}
|
|
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;
|
|
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;
|
|
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(char **pg_vec, unsigned int order, unsigned int len)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < len; i++) {
|
|
if (likely(pg_vec[i]))
|
|
free_pages((unsigned long) pg_vec[i], order);
|
|
}
|
|
kfree(pg_vec);
|
|
}
|
|
|
|
static inline char *alloc_one_pg_vec_page(unsigned long order)
|
|
{
|
|
gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP | __GFP_ZERO | __GFP_NOWARN;
|
|
|
|
return (char *) __get_free_pages(gfp_flags, order);
|
|
}
|
|
|
|
static char **alloc_pg_vec(struct tpacket_req *req, int order)
|
|
{
|
|
unsigned int block_nr = req->tp_block_nr;
|
|
char **pg_vec;
|
|
int i;
|
|
|
|
pg_vec = kzalloc(block_nr * sizeof(char *), GFP_KERNEL);
|
|
if (unlikely(!pg_vec))
|
|
goto out;
|
|
|
|
for (i = 0; i < block_nr; i++) {
|
|
pg_vec[i] = alloc_one_pg_vec_page(order);
|
|
if (unlikely(!pg_vec[i]))
|
|
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)
|
|
{
|
|
char **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;
|
|
#define XC(a, b) ({ __typeof__ ((a)) __t; __t = (a); (a) = (b); __t; })
|
|
spin_lock_bh(&rb_queue->lock);
|
|
pg_vec = XC(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);
|
|
|
|
order = XC(rb->pg_vec_order, order);
|
|
req->tp_block_nr = XC(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);
|
|
#undef XC
|
|
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 = virt_to_page(rb->pg_vec[i]);
|
|
int pg_num;
|
|
|
|
for (pg_num = 0; pg_num < rb->pg_vec_pages;
|
|
pg_num++, page++) {
|
|
err = vm_insert_page(vma, start, page);
|
|
if (unlikely(err))
|
|
goto out;
|
|
start += 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,
|
|
"%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 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);
|