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4704 lines
110 KiB
4704 lines
110 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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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, <[email protected]> |
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* Alan Cox, <[email protected]> |
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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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* Chetan Loke : Implemented TPACKET_V3 block abstraction |
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* layer. |
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* Copyright (C) 2011, <[email protected]> |
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*/ |
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|
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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|
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#include <linux/ethtool.h> |
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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 <linux/vmalloc.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 <linux/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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#include <linux/net_tstamp.h> |
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#include <linux/percpu.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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#include <linux/bpf.h> |
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#include <net/compat.h> |
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|
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#include "internal.h" |
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|
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/* |
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Assumptions: |
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- If the device has no dev->header_ops->create, there is no LL header |
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visible above the device. In this case, its hard_header_len should be 0. |
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The device may prepend its own header internally. In this case, its |
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needed_headroom should be set to the space needed for it to add its |
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internal header. |
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For example, a WiFi driver pretending to be an Ethernet driver should |
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set its hard_header_len to be the Ethernet header length, and set its |
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needed_headroom to be (the real WiFi header length - the fake Ethernet |
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header length). |
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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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|
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On receive: |
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----------- |
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|
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Incoming, dev_has_header(dev) == true |
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mac_header -> ll header |
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data -> data |
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|
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Outgoing, dev_has_header(dev) == true |
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mac_header -> ll header |
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data -> ll header |
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|
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Incoming, dev_has_header(dev) == false |
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mac_header -> data |
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However drivers often make it point to the ll header. |
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This is incorrect because the ll header should be invisible to us. |
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data -> data |
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|
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Outgoing, dev_has_header(dev) == false |
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mac_header -> data. ll header is invisible to us. |
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data -> data |
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|
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Resume |
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If dev_has_header(dev) == false we are unable to restore the ll header, |
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because it is invisible to us. |
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|
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On transmit: |
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------------ |
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|
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dev_has_header(dev) == true |
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mac_header -> ll header |
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data -> ll header |
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|
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dev_has_header(dev) == false (ll header is invisible to us) |
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mac_header -> data |
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data -> data |
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|
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We should set network_header on output to the correct position, |
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packet classifier depends on it. |
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*/ |
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|
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/* Private packet socket structures. */ |
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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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|
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union tpacket_uhdr { |
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struct tpacket_hdr *h1; |
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struct tpacket2_hdr *h2; |
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struct tpacket3_hdr *h3; |
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void *raw; |
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}; |
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|
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static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u, |
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int closing, int tx_ring); |
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|
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#define V3_ALIGNMENT (8) |
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|
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#define BLK_HDR_LEN (ALIGN(sizeof(struct tpacket_block_desc), V3_ALIGNMENT)) |
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|
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#define BLK_PLUS_PRIV(sz_of_priv) \ |
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(BLK_HDR_LEN + ALIGN((sz_of_priv), V3_ALIGNMENT)) |
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|
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#define BLOCK_STATUS(x) ((x)->hdr.bh1.block_status) |
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#define BLOCK_NUM_PKTS(x) ((x)->hdr.bh1.num_pkts) |
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#define BLOCK_O2FP(x) ((x)->hdr.bh1.offset_to_first_pkt) |
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#define BLOCK_LEN(x) ((x)->hdr.bh1.blk_len) |
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#define BLOCK_SNUM(x) ((x)->hdr.bh1.seq_num) |
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#define BLOCK_O2PRIV(x) ((x)->offset_to_priv) |
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struct packet_sock; |
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static int tpacket_rcv(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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static 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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static void packet_increment_head(struct packet_ring_buffer *buff); |
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static int prb_curr_blk_in_use(struct tpacket_block_desc *); |
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static void *prb_dispatch_next_block(struct tpacket_kbdq_core *, |
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struct packet_sock *); |
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static void prb_retire_current_block(struct tpacket_kbdq_core *, |
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struct packet_sock *, unsigned int status); |
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static int prb_queue_frozen(struct tpacket_kbdq_core *); |
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static void prb_open_block(struct tpacket_kbdq_core *, |
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struct tpacket_block_desc *); |
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static void prb_retire_rx_blk_timer_expired(struct timer_list *); |
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static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *); |
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static void prb_fill_rxhash(struct tpacket_kbdq_core *, struct tpacket3_hdr *); |
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static void prb_clear_rxhash(struct tpacket_kbdq_core *, |
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struct tpacket3_hdr *); |
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static void prb_fill_vlan_info(struct tpacket_kbdq_core *, |
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struct tpacket3_hdr *); |
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static void packet_flush_mclist(struct sock *sk); |
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static u16 packet_pick_tx_queue(struct sk_buff *skb); |
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|
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struct packet_skb_cb { |
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union { |
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struct sockaddr_pkt pkt; |
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union { |
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/* Trick: alias skb original length with |
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* ll.sll_family and ll.protocol in order |
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* to save room. |
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*/ |
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unsigned int origlen; |
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struct sockaddr_ll ll; |
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}; |
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} sa; |
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}; |
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|
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#define vio_le() virtio_legacy_is_little_endian() |
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|
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#define PACKET_SKB_CB(__skb) ((struct packet_skb_cb *)((__skb)->cb)) |
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|
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#define GET_PBDQC_FROM_RB(x) ((struct tpacket_kbdq_core *)(&(x)->prb_bdqc)) |
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#define GET_PBLOCK_DESC(x, bid) \ |
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((struct tpacket_block_desc *)((x)->pkbdq[(bid)].buffer)) |
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#define GET_CURR_PBLOCK_DESC_FROM_CORE(x) \ |
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((struct tpacket_block_desc *)((x)->pkbdq[(x)->kactive_blk_num].buffer)) |
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#define GET_NEXT_PRB_BLK_NUM(x) \ |
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(((x)->kactive_blk_num < ((x)->knum_blocks-1)) ? \ |
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((x)->kactive_blk_num+1) : 0) |
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static void __fanout_unlink(struct sock *sk, struct packet_sock *po); |
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static void __fanout_link(struct sock *sk, struct packet_sock *po); |
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|
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static int packet_direct_xmit(struct sk_buff *skb) |
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{ |
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return dev_direct_xmit(skb, packet_pick_tx_queue(skb)); |
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} |
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static struct net_device *packet_cached_dev_get(struct packet_sock *po) |
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{ |
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struct net_device *dev; |
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rcu_read_lock(); |
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dev = rcu_dereference(po->cached_dev); |
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dev_hold(dev); |
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rcu_read_unlock(); |
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return dev; |
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} |
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static void packet_cached_dev_assign(struct packet_sock *po, |
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struct net_device *dev) |
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{ |
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rcu_assign_pointer(po->cached_dev, dev); |
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} |
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static void packet_cached_dev_reset(struct packet_sock *po) |
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{ |
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RCU_INIT_POINTER(po->cached_dev, NULL); |
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} |
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static bool packet_use_direct_xmit(const struct packet_sock *po) |
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{ |
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return po->xmit == packet_direct_xmit; |
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} |
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static u16 packet_pick_tx_queue(struct sk_buff *skb) |
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{ |
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struct net_device *dev = skb->dev; |
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const struct net_device_ops *ops = dev->netdev_ops; |
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int cpu = raw_smp_processor_id(); |
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u16 queue_index; |
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|
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#ifdef CONFIG_XPS |
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skb->sender_cpu = cpu + 1; |
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#endif |
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skb_record_rx_queue(skb, cpu % dev->real_num_tx_queues); |
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if (ops->ndo_select_queue) { |
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queue_index = ops->ndo_select_queue(dev, skb, NULL); |
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queue_index = netdev_cap_txqueue(dev, queue_index); |
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} else { |
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queue_index = netdev_pick_tx(dev, skb, NULL); |
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} |
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return queue_index; |
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} |
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|
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/* __register_prot_hook must be invoked through register_prot_hook |
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* or from a context in which asynchronous accesses to the packet |
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* socket is not possible (packet_create()). |
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*/ |
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static void __register_prot_hook(struct sock *sk) |
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{ |
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struct packet_sock *po = pkt_sk(sk); |
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|
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if (!po->running) { |
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if (po->fanout) |
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__fanout_link(sk, po); |
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else |
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dev_add_pack(&po->prot_hook); |
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sock_hold(sk); |
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po->running = 1; |
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} |
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} |
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static void register_prot_hook(struct sock *sk) |
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{ |
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lockdep_assert_held_once(&pkt_sk(sk)->bind_lock); |
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__register_prot_hook(sk); |
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} |
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|
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/* If the sync parameter is true, we will temporarily drop |
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* the po->bind_lock and do a synchronize_net to make sure no |
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* asynchronous packet processing paths still refer to the elements |
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* of po->prot_hook. If the sync parameter is false, it is the |
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* callers responsibility to take care of this. |
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*/ |
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static void __unregister_prot_hook(struct sock *sk, bool sync) |
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{ |
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struct packet_sock *po = pkt_sk(sk); |
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lockdep_assert_held_once(&po->bind_lock); |
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po->running = 0; |
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if (po->fanout) |
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__fanout_unlink(sk, po); |
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else |
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__dev_remove_pack(&po->prot_hook); |
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__sock_put(sk); |
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if (sync) { |
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spin_unlock(&po->bind_lock); |
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synchronize_net(); |
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spin_lock(&po->bind_lock); |
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} |
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} |
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static void unregister_prot_hook(struct sock *sk, bool sync) |
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{ |
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struct packet_sock *po = pkt_sk(sk); |
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|
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if (po->running) |
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__unregister_prot_hook(sk, sync); |
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} |
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static inline struct page * __pure pgv_to_page(void *addr) |
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{ |
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if (is_vmalloc_addr(addr)) |
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return vmalloc_to_page(addr); |
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return virt_to_page(addr); |
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} |
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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 tpacket_uhdr h; |
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|
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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(pgv_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(pgv_to_page(&h.h2->tp_status)); |
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break; |
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case TPACKET_V3: |
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h.h3->tp_status = status; |
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flush_dcache_page(pgv_to_page(&h.h3->tp_status)); |
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break; |
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default: |
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WARN(1, "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(const struct packet_sock *po, void *frame) |
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{ |
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union tpacket_uhdr h; |
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smp_rmb(); |
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|
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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(pgv_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(pgv_to_page(&h.h2->tp_status)); |
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return h.h2->tp_status; |
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case TPACKET_V3: |
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flush_dcache_page(pgv_to_page(&h.h3->tp_status)); |
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return h.h3->tp_status; |
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default: |
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WARN(1, "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 __u32 tpacket_get_timestamp(struct sk_buff *skb, struct timespec64 *ts, |
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unsigned int flags) |
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{ |
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struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb); |
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|
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if (shhwtstamps && |
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(flags & SOF_TIMESTAMPING_RAW_HARDWARE) && |
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ktime_to_timespec64_cond(shhwtstamps->hwtstamp, ts)) |
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return TP_STATUS_TS_RAW_HARDWARE; |
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|
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if ((flags & SOF_TIMESTAMPING_SOFTWARE) && |
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ktime_to_timespec64_cond(skb->tstamp, ts)) |
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return TP_STATUS_TS_SOFTWARE; |
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|
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return 0; |
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} |
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|
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static __u32 __packet_set_timestamp(struct packet_sock *po, void *frame, |
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struct sk_buff *skb) |
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{ |
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union tpacket_uhdr h; |
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struct timespec64 ts; |
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__u32 ts_status; |
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|
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if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp))) |
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return 0; |
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|
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h.raw = frame; |
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/* |
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* versions 1 through 3 overflow the timestamps in y2106, since they |
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* all store the seconds in a 32-bit unsigned integer. |
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* If we create a version 4, that should have a 64-bit timestamp, |
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* either 64-bit seconds + 32-bit nanoseconds, or just 64-bit |
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* nanoseconds. |
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*/ |
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switch (po->tp_version) { |
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case TPACKET_V1: |
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h.h1->tp_sec = ts.tv_sec; |
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h.h1->tp_usec = ts.tv_nsec / NSEC_PER_USEC; |
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break; |
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case TPACKET_V2: |
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h.h2->tp_sec = ts.tv_sec; |
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h.h2->tp_nsec = ts.tv_nsec; |
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break; |
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case TPACKET_V3: |
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h.h3->tp_sec = ts.tv_sec; |
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h.h3->tp_nsec = ts.tv_nsec; |
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break; |
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default: |
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WARN(1, "TPACKET version not supported.\n"); |
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BUG(); |
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} |
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|
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/* one flush is safe, as both fields always lie on the same cacheline */ |
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flush_dcache_page(pgv_to_page(&h.h1->tp_sec)); |
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smp_wmb(); |
|
|
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return ts_status; |
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} |
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|
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static void *packet_lookup_frame(const struct packet_sock *po, |
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const 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 tpacket_uhdr h; |
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|
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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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|
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h.raw = rb->pg_vec[pg_vec_pos].buffer + |
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(frame_offset * rb->frame_size); |
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|
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if (status != __packet_get_status(po, h.raw)) |
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return NULL; |
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|
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return h.raw; |
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} |
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|
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static 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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|
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static void prb_del_retire_blk_timer(struct tpacket_kbdq_core *pkc) |
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{ |
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del_timer_sync(&pkc->retire_blk_timer); |
|
} |
|
|
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static void prb_shutdown_retire_blk_timer(struct packet_sock *po, |
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struct sk_buff_head *rb_queue) |
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{ |
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struct tpacket_kbdq_core *pkc; |
|
|
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pkc = GET_PBDQC_FROM_RB(&po->rx_ring); |
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|
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spin_lock_bh(&rb_queue->lock); |
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pkc->delete_blk_timer = 1; |
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spin_unlock_bh(&rb_queue->lock); |
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|
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prb_del_retire_blk_timer(pkc); |
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} |
|
|
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static void prb_setup_retire_blk_timer(struct packet_sock *po) |
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{ |
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struct tpacket_kbdq_core *pkc; |
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|
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pkc = GET_PBDQC_FROM_RB(&po->rx_ring); |
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timer_setup(&pkc->retire_blk_timer, prb_retire_rx_blk_timer_expired, |
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0); |
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pkc->retire_blk_timer.expires = jiffies; |
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} |
|
|
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static int prb_calc_retire_blk_tmo(struct packet_sock *po, |
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int blk_size_in_bytes) |
|
{ |
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struct net_device *dev; |
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unsigned int mbits, div; |
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struct ethtool_link_ksettings ecmd; |
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int err; |
|
|
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rtnl_lock(); |
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dev = __dev_get_by_index(sock_net(&po->sk), po->ifindex); |
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if (unlikely(!dev)) { |
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rtnl_unlock(); |
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return DEFAULT_PRB_RETIRE_TOV; |
|
} |
|
err = __ethtool_get_link_ksettings(dev, &ecmd); |
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rtnl_unlock(); |
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if (err) |
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return DEFAULT_PRB_RETIRE_TOV; |
|
|
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/* If the link speed is so slow you don't really |
|
* need to worry about perf anyways |
|
*/ |
|
if (ecmd.base.speed < SPEED_1000 || |
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ecmd.base.speed == SPEED_UNKNOWN) |
|
return DEFAULT_PRB_RETIRE_TOV; |
|
|
|
div = ecmd.base.speed / 1000; |
|
mbits = (blk_size_in_bytes * 8) / (1024 * 1024); |
|
|
|
if (div) |
|
mbits /= div; |
|
|
|
if (div) |
|
return mbits + 1; |
|
return mbits; |
|
} |
|
|
|
static void prb_init_ft_ops(struct tpacket_kbdq_core *p1, |
|
union tpacket_req_u *req_u) |
|
{ |
|
p1->feature_req_word = req_u->req3.tp_feature_req_word; |
|
} |
|
|
|
static void init_prb_bdqc(struct packet_sock *po, |
|
struct packet_ring_buffer *rb, |
|
struct pgv *pg_vec, |
|
union tpacket_req_u *req_u) |
|
{ |
|
struct tpacket_kbdq_core *p1 = GET_PBDQC_FROM_RB(rb); |
|
struct tpacket_block_desc *pbd; |
|
|
|
memset(p1, 0x0, sizeof(*p1)); |
|
|
|
p1->knxt_seq_num = 1; |
|
p1->pkbdq = pg_vec; |
|
pbd = (struct tpacket_block_desc *)pg_vec[0].buffer; |
|
p1->pkblk_start = pg_vec[0].buffer; |
|
p1->kblk_size = req_u->req3.tp_block_size; |
|
p1->knum_blocks = req_u->req3.tp_block_nr; |
|
p1->hdrlen = po->tp_hdrlen; |
|
p1->version = po->tp_version; |
|
p1->last_kactive_blk_num = 0; |
|
po->stats.stats3.tp_freeze_q_cnt = 0; |
|
if (req_u->req3.tp_retire_blk_tov) |
|
p1->retire_blk_tov = req_u->req3.tp_retire_blk_tov; |
|
else |
|
p1->retire_blk_tov = prb_calc_retire_blk_tmo(po, |
|
req_u->req3.tp_block_size); |
|
p1->tov_in_jiffies = msecs_to_jiffies(p1->retire_blk_tov); |
|
p1->blk_sizeof_priv = req_u->req3.tp_sizeof_priv; |
|
rwlock_init(&p1->blk_fill_in_prog_lock); |
|
|
|
p1->max_frame_len = p1->kblk_size - BLK_PLUS_PRIV(p1->blk_sizeof_priv); |
|
prb_init_ft_ops(p1, req_u); |
|
prb_setup_retire_blk_timer(po); |
|
prb_open_block(p1, pbd); |
|
} |
|
|
|
/* Do NOT update the last_blk_num first. |
|
* Assumes sk_buff_head lock is held. |
|
*/ |
|
static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *pkc) |
|
{ |
|
mod_timer(&pkc->retire_blk_timer, |
|
jiffies + pkc->tov_in_jiffies); |
|
pkc->last_kactive_blk_num = pkc->kactive_blk_num; |
|
} |
|
|
|
/* |
|
* Timer logic: |
|
* 1) We refresh the timer only when we open a block. |
|
* By doing this we don't waste cycles refreshing the timer |
|
* on packet-by-packet basis. |
|
* |
|
* With a 1MB block-size, on a 1Gbps line, it will take |
|
* i) ~8 ms to fill a block + ii) memcpy etc. |
|
* In this cut we are not accounting for the memcpy time. |
|
* |
|
* So, if the user sets the 'tmo' to 10ms then the timer |
|
* will never fire while the block is still getting filled |
|
* (which is what we want). However, the user could choose |
|
* to close a block early and that's fine. |
|
* |
|
* But when the timer does fire, we check whether or not to refresh it. |
|
* Since the tmo granularity is in msecs, it is not too expensive |
|
* to refresh the timer, lets say every '8' msecs. |
|
* Either the user can set the 'tmo' or we can derive it based on |
|
* a) line-speed and b) block-size. |
|
* prb_calc_retire_blk_tmo() calculates the tmo. |
|
* |
|
*/ |
|
static void prb_retire_rx_blk_timer_expired(struct timer_list *t) |
|
{ |
|
struct packet_sock *po = |
|
from_timer(po, t, rx_ring.prb_bdqc.retire_blk_timer); |
|
struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(&po->rx_ring); |
|
unsigned int frozen; |
|
struct tpacket_block_desc *pbd; |
|
|
|
spin_lock(&po->sk.sk_receive_queue.lock); |
|
|
|
frozen = prb_queue_frozen(pkc); |
|
pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc); |
|
|
|
if (unlikely(pkc->delete_blk_timer)) |
|
goto out; |
|
|
|
/* We only need to plug the race when the block is partially filled. |
|
* tpacket_rcv: |
|
* lock(); increment BLOCK_NUM_PKTS; unlock() |
|
* copy_bits() is in progress ... |
|
* timer fires on other cpu: |
|
* we can't retire the current block because copy_bits |
|
* is in progress. |
|
* |
|
*/ |
|
if (BLOCK_NUM_PKTS(pbd)) { |
|
/* Waiting for skb_copy_bits to finish... */ |
|
write_lock(&pkc->blk_fill_in_prog_lock); |
|
write_unlock(&pkc->blk_fill_in_prog_lock); |
|
} |
|
|
|
if (pkc->last_kactive_blk_num == pkc->kactive_blk_num) { |
|
if (!frozen) { |
|
if (!BLOCK_NUM_PKTS(pbd)) { |
|
/* An empty block. Just refresh the timer. */ |
|
goto refresh_timer; |
|
} |
|
prb_retire_current_block(pkc, po, TP_STATUS_BLK_TMO); |
|
if (!prb_dispatch_next_block(pkc, po)) |
|
goto refresh_timer; |
|
else |
|
goto out; |
|
} else { |
|
/* Case 1. Queue was frozen because user-space was |
|
* lagging behind. |
|
*/ |
|
if (prb_curr_blk_in_use(pbd)) { |
|
/* |
|
* Ok, user-space is still behind. |
|
* So just refresh the timer. |
|
*/ |
|
goto refresh_timer; |
|
} else { |
|
/* Case 2. queue was frozen,user-space caught up, |
|
* now the link went idle && the timer fired. |
|
* We don't have a block to close.So we open this |
|
* block and restart the timer. |
|
* opening a block thaws the queue,restarts timer |
|
* Thawing/timer-refresh is a side effect. |
|
*/ |
|
prb_open_block(pkc, pbd); |
|
goto out; |
|
} |
|
} |
|
} |
|
|
|
refresh_timer: |
|
_prb_refresh_rx_retire_blk_timer(pkc); |
|
|
|
out: |
|
spin_unlock(&po->sk.sk_receive_queue.lock); |
|
} |
|
|
|
static void prb_flush_block(struct tpacket_kbdq_core *pkc1, |
|
struct tpacket_block_desc *pbd1, __u32 status) |
|
{ |
|
/* Flush everything minus the block header */ |
|
|
|
#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1 |
|
u8 *start, *end; |
|
|
|
start = (u8 *)pbd1; |
|
|
|
/* Skip the block header(we know header WILL fit in 4K) */ |
|
start += PAGE_SIZE; |
|
|
|
end = (u8 *)PAGE_ALIGN((unsigned long)pkc1->pkblk_end); |
|
for (; start < end; start += PAGE_SIZE) |
|
flush_dcache_page(pgv_to_page(start)); |
|
|
|
smp_wmb(); |
|
#endif |
|
|
|
/* Now update the block status. */ |
|
|
|
BLOCK_STATUS(pbd1) = status; |
|
|
|
/* Flush the block header */ |
|
|
|
#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1 |
|
start = (u8 *)pbd1; |
|
flush_dcache_page(pgv_to_page(start)); |
|
|
|
smp_wmb(); |
|
#endif |
|
} |
|
|
|
/* |
|
* Side effect: |
|
* |
|
* 1) flush the block |
|
* 2) Increment active_blk_num |
|
* |
|
* Note:We DONT refresh the timer on purpose. |
|
* Because almost always the next block will be opened. |
|
*/ |
|
static void prb_close_block(struct tpacket_kbdq_core *pkc1, |
|
struct tpacket_block_desc *pbd1, |
|
struct packet_sock *po, unsigned int stat) |
|
{ |
|
__u32 status = TP_STATUS_USER | stat; |
|
|
|
struct tpacket3_hdr *last_pkt; |
|
struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1; |
|
struct sock *sk = &po->sk; |
|
|
|
if (atomic_read(&po->tp_drops)) |
|
status |= TP_STATUS_LOSING; |
|
|
|
last_pkt = (struct tpacket3_hdr *)pkc1->prev; |
|
last_pkt->tp_next_offset = 0; |
|
|
|
/* Get the ts of the last pkt */ |
|
if (BLOCK_NUM_PKTS(pbd1)) { |
|
h1->ts_last_pkt.ts_sec = last_pkt->tp_sec; |
|
h1->ts_last_pkt.ts_nsec = last_pkt->tp_nsec; |
|
} else { |
|
/* Ok, we tmo'd - so get the current time. |
|
* |
|
* It shouldn't really happen as we don't close empty |
|
* blocks. See prb_retire_rx_blk_timer_expired(). |
|
*/ |
|
struct timespec64 ts; |
|
ktime_get_real_ts64(&ts); |
|
h1->ts_last_pkt.ts_sec = ts.tv_sec; |
|
h1->ts_last_pkt.ts_nsec = ts.tv_nsec; |
|
} |
|
|
|
smp_wmb(); |
|
|
|
/* Flush the block */ |
|
prb_flush_block(pkc1, pbd1, status); |
|
|
|
sk->sk_data_ready(sk); |
|
|
|
pkc1->kactive_blk_num = GET_NEXT_PRB_BLK_NUM(pkc1); |
|
} |
|
|
|
static void prb_thaw_queue(struct tpacket_kbdq_core *pkc) |
|
{ |
|
pkc->reset_pending_on_curr_blk = 0; |
|
} |
|
|
|
/* |
|
* Side effect of opening a block: |
|
* |
|
* 1) prb_queue is thawed. |
|
* 2) retire_blk_timer is refreshed. |
|
* |
|
*/ |
|
static void prb_open_block(struct tpacket_kbdq_core *pkc1, |
|
struct tpacket_block_desc *pbd1) |
|
{ |
|
struct timespec64 ts; |
|
struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1; |
|
|
|
smp_rmb(); |
|
|
|
/* We could have just memset this but we will lose the |
|
* flexibility of making the priv area sticky |
|
*/ |
|
|
|
BLOCK_SNUM(pbd1) = pkc1->knxt_seq_num++; |
|
BLOCK_NUM_PKTS(pbd1) = 0; |
|
BLOCK_LEN(pbd1) = BLK_PLUS_PRIV(pkc1->blk_sizeof_priv); |
|
|
|
ktime_get_real_ts64(&ts); |
|
|
|
h1->ts_first_pkt.ts_sec = ts.tv_sec; |
|
h1->ts_first_pkt.ts_nsec = ts.tv_nsec; |
|
|
|
pkc1->pkblk_start = (char *)pbd1; |
|
pkc1->nxt_offset = pkc1->pkblk_start + BLK_PLUS_PRIV(pkc1->blk_sizeof_priv); |
|
|
|
BLOCK_O2FP(pbd1) = (__u32)BLK_PLUS_PRIV(pkc1->blk_sizeof_priv); |
|
BLOCK_O2PRIV(pbd1) = BLK_HDR_LEN; |
|
|
|
pbd1->version = pkc1->version; |
|
pkc1->prev = pkc1->nxt_offset; |
|
pkc1->pkblk_end = pkc1->pkblk_start + pkc1->kblk_size; |
|
|
|
prb_thaw_queue(pkc1); |
|
_prb_refresh_rx_retire_blk_timer(pkc1); |
|
|
|
smp_wmb(); |
|
} |
|
|
|
/* |
|
* Queue freeze logic: |
|
* 1) Assume tp_block_nr = 8 blocks. |
|
* 2) At time 't0', user opens Rx ring. |
|
* 3) Some time past 't0', kernel starts filling blocks starting from 0 .. 7 |
|
* 4) user-space is either sleeping or processing block '0'. |
|
* 5) tpacket_rcv is currently filling block '7', since there is no space left, |
|
* it will close block-7,loop around and try to fill block '0'. |
|
* call-flow: |
|
* __packet_lookup_frame_in_block |
|
* prb_retire_current_block() |
|
* prb_dispatch_next_block() |
|
* |->(BLOCK_STATUS == USER) evaluates to true |
|
* 5.1) Since block-0 is currently in-use, we just freeze the queue. |
|
* 6) Now there are two cases: |
|
* 6.1) Link goes idle right after the queue is frozen. |
|
* But remember, the last open_block() refreshed the timer. |
|
* When this timer expires,it will refresh itself so that we can |
|
* re-open block-0 in near future. |
|
* 6.2) Link is busy and keeps on receiving packets. This is a simple |
|
* case and __packet_lookup_frame_in_block will check if block-0 |
|
* is free and can now be re-used. |
|
*/ |
|
static void prb_freeze_queue(struct tpacket_kbdq_core *pkc, |
|
struct packet_sock *po) |
|
{ |
|
pkc->reset_pending_on_curr_blk = 1; |
|
po->stats.stats3.tp_freeze_q_cnt++; |
|
} |
|
|
|
#define TOTAL_PKT_LEN_INCL_ALIGN(length) (ALIGN((length), V3_ALIGNMENT)) |
|
|
|
/* |
|
* If the next block is free then we will dispatch it |
|
* and return a good offset. |
|
* Else, we will freeze the queue. |
|
* So, caller must check the return value. |
|
*/ |
|
static void *prb_dispatch_next_block(struct tpacket_kbdq_core *pkc, |
|
struct packet_sock *po) |
|
{ |
|
struct tpacket_block_desc *pbd; |
|
|
|
smp_rmb(); |
|
|
|
/* 1. Get current block num */ |
|
pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc); |
|
|
|
/* 2. If this block is currently in_use then freeze the queue */ |
|
if (TP_STATUS_USER & BLOCK_STATUS(pbd)) { |
|
prb_freeze_queue(pkc, po); |
|
return NULL; |
|
} |
|
|
|
/* |
|
* 3. |
|
* open this block and return the offset where the first packet |
|
* needs to get stored. |
|
*/ |
|
prb_open_block(pkc, pbd); |
|
return (void *)pkc->nxt_offset; |
|
} |
|
|
|
static void prb_retire_current_block(struct tpacket_kbdq_core *pkc, |
|
struct packet_sock *po, unsigned int status) |
|
{ |
|
struct tpacket_block_desc *pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc); |
|
|
|
/* retire/close the current block */ |
|
if (likely(TP_STATUS_KERNEL == BLOCK_STATUS(pbd))) { |
|
/* |
|
* Plug the case where copy_bits() is in progress on |
|
* cpu-0 and tpacket_rcv() got invoked on cpu-1, didn't |
|
* have space to copy the pkt in the current block and |
|
* called prb_retire_current_block() |
|
* |
|
* We don't need to worry about the TMO case because |
|
* the timer-handler already handled this case. |
|
*/ |
|
if (!(status & TP_STATUS_BLK_TMO)) { |
|
/* Waiting for skb_copy_bits to finish... */ |
|
write_lock(&pkc->blk_fill_in_prog_lock); |
|
write_unlock(&pkc->blk_fill_in_prog_lock); |
|
} |
|
prb_close_block(pkc, pbd, po, status); |
|
return; |
|
} |
|
} |
|
|
|
static int prb_curr_blk_in_use(struct tpacket_block_desc *pbd) |
|
{ |
|
return TP_STATUS_USER & BLOCK_STATUS(pbd); |
|
} |
|
|
|
static int prb_queue_frozen(struct tpacket_kbdq_core *pkc) |
|
{ |
|
return pkc->reset_pending_on_curr_blk; |
|
} |
|
|
|
static void prb_clear_blk_fill_status(struct packet_ring_buffer *rb) |
|
__releases(&pkc->blk_fill_in_prog_lock) |
|
{ |
|
struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb); |
|
|
|
read_unlock(&pkc->blk_fill_in_prog_lock); |
|
} |
|
|
|
static void prb_fill_rxhash(struct tpacket_kbdq_core *pkc, |
|
struct tpacket3_hdr *ppd) |
|
{ |
|
ppd->hv1.tp_rxhash = skb_get_hash(pkc->skb); |
|
} |
|
|
|
static void prb_clear_rxhash(struct tpacket_kbdq_core *pkc, |
|
struct tpacket3_hdr *ppd) |
|
{ |
|
ppd->hv1.tp_rxhash = 0; |
|
} |
|
|
|
static void prb_fill_vlan_info(struct tpacket_kbdq_core *pkc, |
|
struct tpacket3_hdr *ppd) |
|
{ |
|
if (skb_vlan_tag_present(pkc->skb)) { |
|
ppd->hv1.tp_vlan_tci = skb_vlan_tag_get(pkc->skb); |
|
ppd->hv1.tp_vlan_tpid = ntohs(pkc->skb->vlan_proto); |
|
ppd->tp_status = TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID; |
|
} else { |
|
ppd->hv1.tp_vlan_tci = 0; |
|
ppd->hv1.tp_vlan_tpid = 0; |
|
ppd->tp_status = TP_STATUS_AVAILABLE; |
|
} |
|
} |
|
|
|
static void prb_run_all_ft_ops(struct tpacket_kbdq_core *pkc, |
|
struct tpacket3_hdr *ppd) |
|
{ |
|
ppd->hv1.tp_padding = 0; |
|
prb_fill_vlan_info(pkc, ppd); |
|
|
|
if (pkc->feature_req_word & TP_FT_REQ_FILL_RXHASH) |
|
prb_fill_rxhash(pkc, ppd); |
|
else |
|
prb_clear_rxhash(pkc, ppd); |
|
} |
|
|
|
static void prb_fill_curr_block(char *curr, |
|
struct tpacket_kbdq_core *pkc, |
|
struct tpacket_block_desc *pbd, |
|
unsigned int len) |
|
__acquires(&pkc->blk_fill_in_prog_lock) |
|
{ |
|
struct tpacket3_hdr *ppd; |
|
|
|
ppd = (struct tpacket3_hdr *)curr; |
|
ppd->tp_next_offset = TOTAL_PKT_LEN_INCL_ALIGN(len); |
|
pkc->prev = curr; |
|
pkc->nxt_offset += TOTAL_PKT_LEN_INCL_ALIGN(len); |
|
BLOCK_LEN(pbd) += TOTAL_PKT_LEN_INCL_ALIGN(len); |
|
BLOCK_NUM_PKTS(pbd) += 1; |
|
read_lock(&pkc->blk_fill_in_prog_lock); |
|
prb_run_all_ft_ops(pkc, ppd); |
|
} |
|
|
|
/* Assumes caller has the sk->rx_queue.lock */ |
|
static void *__packet_lookup_frame_in_block(struct packet_sock *po, |
|
struct sk_buff *skb, |
|
unsigned int len |
|
) |
|
{ |
|
struct tpacket_kbdq_core *pkc; |
|
struct tpacket_block_desc *pbd; |
|
char *curr, *end; |
|
|
|
pkc = GET_PBDQC_FROM_RB(&po->rx_ring); |
|
pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc); |
|
|
|
/* Queue is frozen when user space is lagging behind */ |
|
if (prb_queue_frozen(pkc)) { |
|
/* |
|
* Check if that last block which caused the queue to freeze, |
|
* is still in_use by user-space. |
|
*/ |
|
if (prb_curr_blk_in_use(pbd)) { |
|
/* Can't record this packet */ |
|
return NULL; |
|
} else { |
|
/* |
|
* Ok, the block was released by user-space. |
|
* Now let's open that block. |
|
* opening a block also thaws the queue. |
|
* Thawing is a side effect. |
|
*/ |
|
prb_open_block(pkc, pbd); |
|
} |
|
} |
|
|
|
smp_mb(); |
|
curr = pkc->nxt_offset; |
|
pkc->skb = skb; |
|
end = (char *)pbd + pkc->kblk_size; |
|
|
|
/* first try the current block */ |
|
if (curr+TOTAL_PKT_LEN_INCL_ALIGN(len) < end) { |
|
prb_fill_curr_block(curr, pkc, pbd, len); |
|
return (void *)curr; |
|
} |
|
|
|
/* Ok, close the current block */ |
|
prb_retire_current_block(pkc, po, 0); |
|
|
|
/* Now, try to dispatch the next block */ |
|
curr = (char *)prb_dispatch_next_block(pkc, po); |
|
if (curr) { |
|
pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc); |
|
prb_fill_curr_block(curr, pkc, pbd, len); |
|
return (void *)curr; |
|
} |
|
|
|
/* |
|
* No free blocks are available.user_space hasn't caught up yet. |
|
* Queue was just frozen and now this packet will get dropped. |
|
*/ |
|
return NULL; |
|
} |
|
|
|
static void *packet_current_rx_frame(struct packet_sock *po, |
|
struct sk_buff *skb, |
|
int status, unsigned int len) |
|
{ |
|
char *curr = NULL; |
|
switch (po->tp_version) { |
|
case TPACKET_V1: |
|
case TPACKET_V2: |
|
curr = packet_lookup_frame(po, &po->rx_ring, |
|
po->rx_ring.head, status); |
|
return curr; |
|
case TPACKET_V3: |
|
return __packet_lookup_frame_in_block(po, skb, len); |
|
default: |
|
WARN(1, "TPACKET version not supported\n"); |
|
BUG(); |
|
return NULL; |
|
} |
|
} |
|
|
|
static void *prb_lookup_block(const struct packet_sock *po, |
|
const struct packet_ring_buffer *rb, |
|
unsigned int idx, |
|
int status) |
|
{ |
|
struct tpacket_kbdq_core *pkc = GET_PBDQC_FROM_RB(rb); |
|
struct tpacket_block_desc *pbd = GET_PBLOCK_DESC(pkc, idx); |
|
|
|
if (status != BLOCK_STATUS(pbd)) |
|
return NULL; |
|
return pbd; |
|
} |
|
|
|
static int prb_previous_blk_num(struct packet_ring_buffer *rb) |
|
{ |
|
unsigned int prev; |
|
if (rb->prb_bdqc.kactive_blk_num) |
|
prev = rb->prb_bdqc.kactive_blk_num-1; |
|
else |
|
prev = rb->prb_bdqc.knum_blocks-1; |
|
return prev; |
|
} |
|
|
|
/* Assumes caller has held the rx_queue.lock */ |
|
static void *__prb_previous_block(struct packet_sock *po, |
|
struct packet_ring_buffer *rb, |
|
int status) |
|
{ |
|
unsigned int previous = prb_previous_blk_num(rb); |
|
return prb_lookup_block(po, rb, previous, status); |
|
} |
|
|
|
static void *packet_previous_rx_frame(struct packet_sock *po, |
|
struct packet_ring_buffer *rb, |
|
int status) |
|
{ |
|
if (po->tp_version <= TPACKET_V2) |
|
return packet_previous_frame(po, rb, status); |
|
|
|
return __prb_previous_block(po, rb, status); |
|
} |
|
|
|
static void packet_increment_rx_head(struct packet_sock *po, |
|
struct packet_ring_buffer *rb) |
|
{ |
|
switch (po->tp_version) { |
|
case TPACKET_V1: |
|
case TPACKET_V2: |
|
return packet_increment_head(rb); |
|
case TPACKET_V3: |
|
default: |
|
WARN(1, "TPACKET version not supported.\n"); |
|
BUG(); |
|
return; |
|
} |
|
} |
|
|
|
static 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 void packet_increment_head(struct packet_ring_buffer *buff) |
|
{ |
|
buff->head = buff->head != buff->frame_max ? buff->head+1 : 0; |
|
} |
|
|
|
static void packet_inc_pending(struct packet_ring_buffer *rb) |
|
{ |
|
this_cpu_inc(*rb->pending_refcnt); |
|
} |
|
|
|
static void packet_dec_pending(struct packet_ring_buffer *rb) |
|
{ |
|
this_cpu_dec(*rb->pending_refcnt); |
|
} |
|
|
|
static unsigned int packet_read_pending(const struct packet_ring_buffer *rb) |
|
{ |
|
unsigned int refcnt = 0; |
|
int cpu; |
|
|
|
/* We don't use pending refcount in rx_ring. */ |
|
if (rb->pending_refcnt == NULL) |
|
return 0; |
|
|
|
for_each_possible_cpu(cpu) |
|
refcnt += *per_cpu_ptr(rb->pending_refcnt, cpu); |
|
|
|
return refcnt; |
|
} |
|
|
|
static int packet_alloc_pending(struct packet_sock *po) |
|
{ |
|
po->rx_ring.pending_refcnt = NULL; |
|
|
|
po->tx_ring.pending_refcnt = alloc_percpu(unsigned int); |
|
if (unlikely(po->tx_ring.pending_refcnt == NULL)) |
|
return -ENOBUFS; |
|
|
|
return 0; |
|
} |
|
|
|
static void packet_free_pending(struct packet_sock *po) |
|
{ |
|
free_percpu(po->tx_ring.pending_refcnt); |
|
} |
|
|
|
#define ROOM_POW_OFF 2 |
|
#define ROOM_NONE 0x0 |
|
#define ROOM_LOW 0x1 |
|
#define ROOM_NORMAL 0x2 |
|
|
|
static bool __tpacket_has_room(const struct packet_sock *po, int pow_off) |
|
{ |
|
int idx, len; |
|
|
|
len = READ_ONCE(po->rx_ring.frame_max) + 1; |
|
idx = READ_ONCE(po->rx_ring.head); |
|
if (pow_off) |
|
idx += len >> pow_off; |
|
if (idx >= len) |
|
idx -= len; |
|
return packet_lookup_frame(po, &po->rx_ring, idx, TP_STATUS_KERNEL); |
|
} |
|
|
|
static bool __tpacket_v3_has_room(const struct packet_sock *po, int pow_off) |
|
{ |
|
int idx, len; |
|
|
|
len = READ_ONCE(po->rx_ring.prb_bdqc.knum_blocks); |
|
idx = READ_ONCE(po->rx_ring.prb_bdqc.kactive_blk_num); |
|
if (pow_off) |
|
idx += len >> pow_off; |
|
if (idx >= len) |
|
idx -= len; |
|
return prb_lookup_block(po, &po->rx_ring, idx, TP_STATUS_KERNEL); |
|
} |
|
|
|
static int __packet_rcv_has_room(const struct packet_sock *po, |
|
const struct sk_buff *skb) |
|
{ |
|
const struct sock *sk = &po->sk; |
|
int ret = ROOM_NONE; |
|
|
|
if (po->prot_hook.func != tpacket_rcv) { |
|
int rcvbuf = READ_ONCE(sk->sk_rcvbuf); |
|
int avail = rcvbuf - atomic_read(&sk->sk_rmem_alloc) |
|
- (skb ? skb->truesize : 0); |
|
|
|
if (avail > (rcvbuf >> ROOM_POW_OFF)) |
|
return ROOM_NORMAL; |
|
else if (avail > 0) |
|
return ROOM_LOW; |
|
else |
|
return ROOM_NONE; |
|
} |
|
|
|
if (po->tp_version == TPACKET_V3) { |
|
if (__tpacket_v3_has_room(po, ROOM_POW_OFF)) |
|
ret = ROOM_NORMAL; |
|
else if (__tpacket_v3_has_room(po, 0)) |
|
ret = ROOM_LOW; |
|
} else { |
|
if (__tpacket_has_room(po, ROOM_POW_OFF)) |
|
ret = ROOM_NORMAL; |
|
else if (__tpacket_has_room(po, 0)) |
|
ret = ROOM_LOW; |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
static int packet_rcv_has_room(struct packet_sock *po, struct sk_buff *skb) |
|
{ |
|
int pressure, ret; |
|
|
|
ret = __packet_rcv_has_room(po, skb); |
|
pressure = ret != ROOM_NORMAL; |
|
|
|
if (READ_ONCE(po->pressure) != pressure) |
|
WRITE_ONCE(po->pressure, pressure); |
|
|
|
return ret; |
|
} |
|
|
|
static void packet_rcv_try_clear_pressure(struct packet_sock *po) |
|
{ |
|
if (READ_ONCE(po->pressure) && |
|
__packet_rcv_has_room(po, NULL) == ROOM_NORMAL) |
|
WRITE_ONCE(po->pressure, 0); |
|
} |
|
|
|
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(refcount_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 bool fanout_flow_is_huge(struct packet_sock *po, struct sk_buff *skb) |
|
{ |
|
u32 *history = po->rollover->history; |
|
u32 victim, rxhash; |
|
int i, count = 0; |
|
|
|
rxhash = skb_get_hash(skb); |
|
for (i = 0; i < ROLLOVER_HLEN; i++) |
|
if (READ_ONCE(history[i]) == rxhash) |
|
count++; |
|
|
|
victim = prandom_u32() % ROLLOVER_HLEN; |
|
|
|
/* Avoid dirtying the cache line if possible */ |
|
if (READ_ONCE(history[victim]) != rxhash) |
|
WRITE_ONCE(history[victim], rxhash); |
|
|
|
return count > (ROLLOVER_HLEN >> 1); |
|
} |
|
|
|
static unsigned int fanout_demux_hash(struct packet_fanout *f, |
|
struct sk_buff *skb, |
|
unsigned int num) |
|
{ |
|
return reciprocal_scale(__skb_get_hash_symmetric(skb), num); |
|
} |
|
|
|
static unsigned int fanout_demux_lb(struct packet_fanout *f, |
|
struct sk_buff *skb, |
|
unsigned int num) |
|
{ |
|
unsigned int val = atomic_inc_return(&f->rr_cur); |
|
|
|
return val % num; |
|
} |
|
|
|
static unsigned int fanout_demux_cpu(struct packet_fanout *f, |
|
struct sk_buff *skb, |
|
unsigned int num) |
|
{ |
|
return smp_processor_id() % num; |
|
} |
|
|
|
static unsigned int fanout_demux_rnd(struct packet_fanout *f, |
|
struct sk_buff *skb, |
|
unsigned int num) |
|
{ |
|
return prandom_u32_max(num); |
|
} |
|
|
|
static unsigned int fanout_demux_rollover(struct packet_fanout *f, |
|
struct sk_buff *skb, |
|
unsigned int idx, bool try_self, |
|
unsigned int num) |
|
{ |
|
struct packet_sock *po, *po_next, *po_skip = NULL; |
|
unsigned int i, j, room = ROOM_NONE; |
|
|
|
po = pkt_sk(rcu_dereference(f->arr[idx])); |
|
|
|
if (try_self) { |
|
room = packet_rcv_has_room(po, skb); |
|
if (room == ROOM_NORMAL || |
|
(room == ROOM_LOW && !fanout_flow_is_huge(po, skb))) |
|
return idx; |
|
po_skip = po; |
|
} |
|
|
|
i = j = min_t(int, po->rollover->sock, num - 1); |
|
do { |
|
po_next = pkt_sk(rcu_dereference(f->arr[i])); |
|
if (po_next != po_skip && !READ_ONCE(po_next->pressure) && |
|
packet_rcv_has_room(po_next, skb) == ROOM_NORMAL) { |
|
if (i != j) |
|
po->rollover->sock = i; |
|
atomic_long_inc(&po->rollover->num); |
|
if (room == ROOM_LOW) |
|
atomic_long_inc(&po->rollover->num_huge); |
|
return i; |
|
} |
|
|
|
if (++i == num) |
|
i = 0; |
|
} while (i != j); |
|
|
|
atomic_long_inc(&po->rollover->num_failed); |
|
return idx; |
|
} |
|
|
|
static unsigned int fanout_demux_qm(struct packet_fanout *f, |
|
struct sk_buff *skb, |
|
unsigned int num) |
|
{ |
|
return skb_get_queue_mapping(skb) % num; |
|
} |
|
|
|
static unsigned int fanout_demux_bpf(struct packet_fanout *f, |
|
struct sk_buff *skb, |
|
unsigned int num) |
|
{ |
|
struct bpf_prog *prog; |
|
unsigned int ret = 0; |
|
|
|
rcu_read_lock(); |
|
prog = rcu_dereference(f->bpf_prog); |
|
if (prog) |
|
ret = bpf_prog_run_clear_cb(prog, skb) % num; |
|
rcu_read_unlock(); |
|
|
|
return ret; |
|
} |
|
|
|
static bool fanout_has_flag(struct packet_fanout *f, u16 flag) |
|
{ |
|
return f->flags & (flag >> 8); |
|
} |
|
|
|
static int packet_rcv_fanout(struct sk_buff *skb, struct net_device *dev, |
|
struct packet_type *pt, struct net_device *orig_dev) |
|
{ |
|
struct packet_fanout *f = pt->af_packet_priv; |
|
unsigned int num = READ_ONCE(f->num_members); |
|
struct net *net = read_pnet(&f->net); |
|
struct packet_sock *po; |
|
unsigned int idx; |
|
|
|
if (!net_eq(dev_net(dev), net) || !num) { |
|
kfree_skb(skb); |
|
return 0; |
|
} |
|
|
|
if (fanout_has_flag(f, PACKET_FANOUT_FLAG_DEFRAG)) { |
|
skb = ip_check_defrag(net, skb, IP_DEFRAG_AF_PACKET); |
|
if (!skb) |
|
return 0; |
|
} |
|
switch (f->type) { |
|
case PACKET_FANOUT_HASH: |
|
default: |
|
idx = fanout_demux_hash(f, skb, num); |
|
break; |
|
case PACKET_FANOUT_LB: |
|
idx = fanout_demux_lb(f, skb, num); |
|
break; |
|
case PACKET_FANOUT_CPU: |
|
idx = fanout_demux_cpu(f, skb, num); |
|
break; |
|
case PACKET_FANOUT_RND: |
|
idx = fanout_demux_rnd(f, skb, num); |
|
break; |
|
case PACKET_FANOUT_QM: |
|
idx = fanout_demux_qm(f, skb, num); |
|
break; |
|
case PACKET_FANOUT_ROLLOVER: |
|
idx = fanout_demux_rollover(f, skb, 0, false, num); |
|
break; |
|
case PACKET_FANOUT_CBPF: |
|
case PACKET_FANOUT_EBPF: |
|
idx = fanout_demux_bpf(f, skb, num); |
|
break; |
|
} |
|
|
|
if (fanout_has_flag(f, PACKET_FANOUT_FLAG_ROLLOVER)) |
|
idx = fanout_demux_rollover(f, skb, idx, true, num); |
|
|
|
po = pkt_sk(rcu_dereference(f->arr[idx])); |
|
return po->prot_hook.func(skb, dev, &po->prot_hook, orig_dev); |
|
} |
|
|
|
DEFINE_MUTEX(fanout_mutex); |
|
EXPORT_SYMBOL_GPL(fanout_mutex); |
|
static LIST_HEAD(fanout_list); |
|
static u16 fanout_next_id; |
|
|
|
static void __fanout_link(struct sock *sk, struct packet_sock *po) |
|
{ |
|
struct packet_fanout *f = po->fanout; |
|
|
|
spin_lock(&f->lock); |
|
rcu_assign_pointer(f->arr[f->num_members], sk); |
|
smp_wmb(); |
|
f->num_members++; |
|
if (f->num_members == 1) |
|
dev_add_pack(&f->prot_hook); |
|
spin_unlock(&f->lock); |
|
} |
|
|
|
static void __fanout_unlink(struct sock *sk, struct packet_sock *po) |
|
{ |
|
struct packet_fanout *f = po->fanout; |
|
int i; |
|
|
|
spin_lock(&f->lock); |
|
for (i = 0; i < f->num_members; i++) { |
|
if (rcu_dereference_protected(f->arr[i], |
|
lockdep_is_held(&f->lock)) == sk) |
|
break; |
|
} |
|
BUG_ON(i >= f->num_members); |
|
rcu_assign_pointer(f->arr[i], |
|
rcu_dereference_protected(f->arr[f->num_members - 1], |
|
lockdep_is_held(&f->lock))); |
|
f->num_members--; |
|
if (f->num_members == 0) |
|
__dev_remove_pack(&f->prot_hook); |
|
spin_unlock(&f->lock); |
|
} |
|
|
|
static bool match_fanout_group(struct packet_type *ptype, struct sock *sk) |
|
{ |
|
if (sk->sk_family != PF_PACKET) |
|
return false; |
|
|
|
return ptype->af_packet_priv == pkt_sk(sk)->fanout; |
|
} |
|
|
|
static void fanout_init_data(struct packet_fanout *f) |
|
{ |
|
switch (f->type) { |
|
case PACKET_FANOUT_LB: |
|
atomic_set(&f->rr_cur, 0); |
|
break; |
|
case PACKET_FANOUT_CBPF: |
|
case PACKET_FANOUT_EBPF: |
|
RCU_INIT_POINTER(f->bpf_prog, NULL); |
|
break; |
|
} |
|
} |
|
|
|
static void __fanout_set_data_bpf(struct packet_fanout *f, struct bpf_prog *new) |
|
{ |
|
struct bpf_prog *old; |
|
|
|
spin_lock(&f->lock); |
|
old = rcu_dereference_protected(f->bpf_prog, lockdep_is_held(&f->lock)); |
|
rcu_assign_pointer(f->bpf_prog, new); |
|
spin_unlock(&f->lock); |
|
|
|
if (old) { |
|
synchronize_net(); |
|
bpf_prog_destroy(old); |
|
} |
|
} |
|
|
|
static int fanout_set_data_cbpf(struct packet_sock *po, sockptr_t data, |
|
unsigned int len) |
|
{ |
|
struct bpf_prog *new; |
|
struct sock_fprog fprog; |
|
int ret; |
|
|
|
if (sock_flag(&po->sk, SOCK_FILTER_LOCKED)) |
|
return -EPERM; |
|
|
|
ret = copy_bpf_fprog_from_user(&fprog, data, len); |
|
if (ret) |
|
return ret; |
|
|
|
ret = bpf_prog_create_from_user(&new, &fprog, NULL, false); |
|
if (ret) |
|
return ret; |
|
|
|
__fanout_set_data_bpf(po->fanout, new); |
|
return 0; |
|
} |
|
|
|
static int fanout_set_data_ebpf(struct packet_sock *po, sockptr_t data, |
|
unsigned int len) |
|
{ |
|
struct bpf_prog *new; |
|
u32 fd; |
|
|
|
if (sock_flag(&po->sk, SOCK_FILTER_LOCKED)) |
|
return -EPERM; |
|
if (len != sizeof(fd)) |
|
return -EINVAL; |
|
if (copy_from_sockptr(&fd, data, len)) |
|
return -EFAULT; |
|
|
|
new = bpf_prog_get_type(fd, BPF_PROG_TYPE_SOCKET_FILTER); |
|
if (IS_ERR(new)) |
|
return PTR_ERR(new); |
|
|
|
__fanout_set_data_bpf(po->fanout, new); |
|
return 0; |
|
} |
|
|
|
static int fanout_set_data(struct packet_sock *po, sockptr_t data, |
|
unsigned int len) |
|
{ |
|
switch (po->fanout->type) { |
|
case PACKET_FANOUT_CBPF: |
|
return fanout_set_data_cbpf(po, data, len); |
|
case PACKET_FANOUT_EBPF: |
|
return fanout_set_data_ebpf(po, data, len); |
|
default: |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
static void fanout_release_data(struct packet_fanout *f) |
|
{ |
|
switch (f->type) { |
|
case PACKET_FANOUT_CBPF: |
|
case PACKET_FANOUT_EBPF: |
|
__fanout_set_data_bpf(f, NULL); |
|
} |
|
} |
|
|
|
static bool __fanout_id_is_free(struct sock *sk, u16 candidate_id) |
|
{ |
|
struct packet_fanout *f; |
|
|
|
list_for_each_entry(f, &fanout_list, list) { |
|
if (f->id == candidate_id && |
|
read_pnet(&f->net) == sock_net(sk)) { |
|
return false; |
|
} |
|
} |
|
return true; |
|
} |
|
|
|
static bool fanout_find_new_id(struct sock *sk, u16 *new_id) |
|
{ |
|
u16 id = fanout_next_id; |
|
|
|
do { |
|
if (__fanout_id_is_free(sk, id)) { |
|
*new_id = id; |
|
fanout_next_id = id + 1; |
|
return true; |
|
} |
|
|
|
id++; |
|
} while (id != fanout_next_id); |
|
|
|
return false; |
|
} |
|
|
|
static int fanout_add(struct sock *sk, struct fanout_args *args) |
|
{ |
|
struct packet_rollover *rollover = NULL; |
|
struct packet_sock *po = pkt_sk(sk); |
|
u16 type_flags = args->type_flags; |
|
struct packet_fanout *f, *match; |
|
u8 type = type_flags & 0xff; |
|
u8 flags = type_flags >> 8; |
|
u16 id = args->id; |
|
int err; |
|
|
|
switch (type) { |
|
case PACKET_FANOUT_ROLLOVER: |
|
if (type_flags & PACKET_FANOUT_FLAG_ROLLOVER) |
|
return -EINVAL; |
|
break; |
|
case PACKET_FANOUT_HASH: |
|
case PACKET_FANOUT_LB: |
|
case PACKET_FANOUT_CPU: |
|
case PACKET_FANOUT_RND: |
|
case PACKET_FANOUT_QM: |
|
case PACKET_FANOUT_CBPF: |
|
case PACKET_FANOUT_EBPF: |
|
break; |
|
default: |
|
return -EINVAL; |
|
} |
|
|
|
mutex_lock(&fanout_mutex); |
|
|
|
err = -EALREADY; |
|
if (po->fanout) |
|
goto out; |
|
|
|
if (type == PACKET_FANOUT_ROLLOVER || |
|
(type_flags & PACKET_FANOUT_FLAG_ROLLOVER)) { |
|
err = -ENOMEM; |
|
rollover = kzalloc(sizeof(*rollover), GFP_KERNEL); |
|
if (!rollover) |
|
goto out; |
|
atomic_long_set(&rollover->num, 0); |
|
atomic_long_set(&rollover->num_huge, 0); |
|
atomic_long_set(&rollover->num_failed, 0); |
|
} |
|
|
|
if (type_flags & PACKET_FANOUT_FLAG_UNIQUEID) { |
|
if (id != 0) { |
|
err = -EINVAL; |
|
goto out; |
|
} |
|
if (!fanout_find_new_id(sk, &id)) { |
|
err = -ENOMEM; |
|
goto out; |
|
} |
|
/* ephemeral flag for the first socket in the group: drop it */ |
|
flags &= ~(PACKET_FANOUT_FLAG_UNIQUEID >> 8); |
|
} |
|
|
|
match = NULL; |
|
list_for_each_entry(f, &fanout_list, list) { |
|
if (f->id == id && |
|
read_pnet(&f->net) == sock_net(sk)) { |
|
match = f; |
|
break; |
|
} |
|
} |
|
err = -EINVAL; |
|
if (match) { |
|
if (match->flags != flags) |
|
goto out; |
|
if (args->max_num_members && |
|
args->max_num_members != match->max_num_members) |
|
goto out; |
|
} else { |
|
if (args->max_num_members > PACKET_FANOUT_MAX) |
|
goto out; |
|
if (!args->max_num_members) |
|
/* legacy PACKET_FANOUT_MAX */ |
|
args->max_num_members = 256; |
|
err = -ENOMEM; |
|
match = kvzalloc(struct_size(match, arr, args->max_num_members), |
|
GFP_KERNEL); |
|
if (!match) |
|
goto out; |
|
write_pnet(&match->net, sock_net(sk)); |
|
match->id = id; |
|
match->type = type; |
|
match->flags = flags; |
|
INIT_LIST_HEAD(&match->list); |
|
spin_lock_init(&match->lock); |
|
refcount_set(&match->sk_ref, 0); |
|
fanout_init_data(match); |
|
match->prot_hook.type = po->prot_hook.type; |
|
match->prot_hook.dev = po->prot_hook.dev; |
|
match->prot_hook.func = packet_rcv_fanout; |
|
match->prot_hook.af_packet_priv = match; |
|
match->prot_hook.id_match = match_fanout_group; |
|
match->max_num_members = args->max_num_members; |
|
list_add(&match->list, &fanout_list); |
|
} |
|
err = -EINVAL; |
|
|
|
spin_lock(&po->bind_lock); |
|
if (po->running && |
|
match->type == type && |
|
match->prot_hook.type == po->prot_hook.type && |
|
match->prot_hook.dev == po->prot_hook.dev) { |
|
err = -ENOSPC; |
|
if (refcount_read(&match->sk_ref) < match->max_num_members) { |
|
__dev_remove_pack(&po->prot_hook); |
|
po->fanout = match; |
|
po->rollover = rollover; |
|
rollover = NULL; |
|
refcount_set(&match->sk_ref, refcount_read(&match->sk_ref) + 1); |
|
__fanout_link(sk, po); |
|
err = 0; |
|
} |
|
} |
|
spin_unlock(&po->bind_lock); |
|
|
|
if (err && !refcount_read(&match->sk_ref)) { |
|
list_del(&match->list); |
|
kvfree(match); |
|
} |
|
|
|
out: |
|
kfree(rollover); |
|
mutex_unlock(&fanout_mutex); |
|
return err; |
|
} |
|
|
|
/* If pkt_sk(sk)->fanout->sk_ref is zero, this function removes |
|
* pkt_sk(sk)->fanout from fanout_list and returns pkt_sk(sk)->fanout. |
|
* It is the responsibility of the caller to call fanout_release_data() and |
|
* free the returned packet_fanout (after synchronize_net()) |
|
*/ |
|
static struct packet_fanout *fanout_release(struct sock *sk) |
|
{ |
|
struct packet_sock *po = pkt_sk(sk); |
|
struct packet_fanout *f; |
|
|
|
mutex_lock(&fanout_mutex); |
|
f = po->fanout; |
|
if (f) { |
|
po->fanout = NULL; |
|
|
|
if (refcount_dec_and_test(&f->sk_ref)) |
|
list_del(&f->list); |
|
else |
|
f = NULL; |
|
} |
|
mutex_unlock(&fanout_mutex); |
|
|
|
return f; |
|
} |
|
|
|
static bool packet_extra_vlan_len_allowed(const struct net_device *dev, |
|
struct sk_buff *skb) |
|
{ |
|
/* Earlier code assumed this would be a VLAN pkt, double-check |
|
* this now that we have the actual packet in hand. We can only |
|
* do this check on Ethernet devices. |
|
*/ |
|
if (unlikely(dev->type != ARPHRD_ETHER)) |
|
return false; |
|
|
|
skb_reset_mac_header(skb); |
|
return likely(eth_hdr(skb)->h_proto == htons(ETH_P_8021Q)); |
|
} |
|
|
|
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_ct(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; |
|
} |
|
|
|
static void packet_parse_headers(struct sk_buff *skb, struct socket *sock) |
|
{ |
|
if ((!skb->protocol || skb->protocol == htons(ETH_P_ALL)) && |
|
sock->type == SOCK_RAW) { |
|
skb_reset_mac_header(skb); |
|
skb->protocol = dev_parse_header_protocol(skb); |
|
} |
|
|
|
skb_probe_transport_header(skb); |
|
} |
|
|
|
/* |
|
* Output a raw packet to a device layer. This bypasses all the other |
|
* protocol layers and you must therefore supply it with a complete frame |
|
*/ |
|
|
|
static int packet_sendmsg_spkt(struct socket *sock, struct msghdr *msg, |
|
size_t len) |
|
{ |
|
struct sock *sk = sock->sk; |
|
DECLARE_SOCKADDR(struct sockaddr_pkt *, saddr, msg->msg_name); |
|
struct sk_buff *skb = NULL; |
|
struct net_device *dev; |
|
struct sockcm_cookie sockc; |
|
__be16 proto = 0; |
|
int err; |
|
int extra_len = 0; |
|
|
|
/* |
|
* 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[sizeof(saddr->spkt_device) - 1] = 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. |
|
*/ |
|
|
|
if (unlikely(sock_flag(sk, SOCK_NOFCS))) { |
|
if (!netif_supports_nofcs(dev)) { |
|
err = -EPROTONOSUPPORT; |
|
goto out_unlock; |
|
} |
|
extra_len = 4; /* We're doing our own CRC */ |
|
} |
|
|
|
err = -EMSGSIZE; |
|
if (len > dev->mtu + dev->hard_header_len + VLAN_HLEN + extra_len) |
|
goto out_unlock; |
|
|
|
if (!skb) { |
|
size_t reserved = LL_RESERVED_SPACE(dev); |
|
int tlen = dev->needed_tailroom; |
|
unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0; |
|
|
|
rcu_read_unlock(); |
|
skb = sock_wmalloc(sk, len + reserved + tlen, 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_from_msg(skb_put(skb, len), msg, len); |
|
if (err) |
|
goto out_free; |
|
goto retry; |
|
} |
|
|
|
if (!dev_validate_header(dev, skb->data, len)) { |
|
err = -EINVAL; |
|
goto out_unlock; |
|
} |
|
if (len > (dev->mtu + dev->hard_header_len + extra_len) && |
|
!packet_extra_vlan_len_allowed(dev, skb)) { |
|
err = -EMSGSIZE; |
|
goto out_unlock; |
|
} |
|
|
|
sockcm_init(&sockc, sk); |
|
if (msg->msg_controllen) { |
|
err = sock_cmsg_send(sk, msg, &sockc); |
|
if (unlikely(err)) |
|
goto out_unlock; |
|
} |
|
|
|
skb->protocol = proto; |
|
skb->dev = dev; |
|
skb->priority = sk->sk_priority; |
|
skb->mark = sk->sk_mark; |
|
skb->tstamp = sockc.transmit_time; |
|
|
|
skb_setup_tx_timestamp(skb, sockc.tsflags); |
|
|
|
if (unlikely(extra_len == 4)) |
|
skb->no_fcs = 1; |
|
|
|
packet_parse_headers(skb, sock); |
|
|
|
dev_queue_xmit(skb); |
|
rcu_read_unlock(); |
|
return len; |
|
|
|
out_unlock: |
|
rcu_read_unlock(); |
|
out_free: |
|
kfree_skb(skb); |
|
return err; |
|
} |
|
|
|
static unsigned int run_filter(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 = bpf_prog_run_clear_cb(filter->prog, skb); |
|
rcu_read_unlock(); |
|
|
|
return res; |
|
} |
|
|
|
static int packet_rcv_vnet(struct msghdr *msg, const struct sk_buff *skb, |
|
size_t *len) |
|
{ |
|
struct virtio_net_hdr vnet_hdr; |
|
|
|
if (*len < sizeof(vnet_hdr)) |
|
return -EINVAL; |
|
*len -= sizeof(vnet_hdr); |
|
|
|
if (virtio_net_hdr_from_skb(skb, &vnet_hdr, vio_le(), true, 0)) |
|
return -EINVAL; |
|
|
|
return memcpy_to_msg(msg, (void *)&vnet_hdr, sizeof(vnet_hdr)); |
|
} |
|
|
|
/* |
|
* 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 |
|
* sequentially, 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; |
|
bool is_drop_n_account = false; |
|
|
|
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_has_header(dev)) { |
|
/* 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) >= 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; |
|
} |
|
consume_skb(skb); |
|
skb = nskb; |
|
} |
|
|
|
sock_skb_cb_check_size(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8); |
|
|
|
sll = &PACKET_SKB_CB(skb)->sa.ll; |
|
sll->sll_hatype = dev->type; |
|
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); |
|
|
|
/* sll->sll_family and sll->sll_protocol are set in packet_recvmsg(). |
|
* Use their space for storing the original skb length. |
|
*/ |
|
PACKET_SKB_CB(skb)->sa.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_ct(skb); |
|
|
|
spin_lock(&sk->sk_receive_queue.lock); |
|
po->stats.stats1.tp_packets++; |
|
sock_skb_set_dropcount(sk, skb); |
|
__skb_queue_tail(&sk->sk_receive_queue, skb); |
|
spin_unlock(&sk->sk_receive_queue.lock); |
|
sk->sk_data_ready(sk); |
|
return 0; |
|
|
|
drop_n_acct: |
|
is_drop_n_account = true; |
|
atomic_inc(&po->tp_drops); |
|
atomic_inc(&sk->sk_drops); |
|
|
|
drop_n_restore: |
|
if (skb_head != skb->data && skb_shared(skb)) { |
|
skb->data = skb_head; |
|
skb->len = skb_len; |
|
} |
|
drop: |
|
if (!is_drop_n_account) |
|
consume_skb(skb); |
|
else |
|
kfree_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 tpacket_uhdr h; |
|
u8 *skb_head = skb->data; |
|
int skb_len = skb->len; |
|
unsigned int snaplen, res; |
|
unsigned long status = TP_STATUS_USER; |
|
unsigned short macoff, hdrlen; |
|
unsigned int netoff; |
|
struct sk_buff *copy_skb = NULL; |
|
struct timespec64 ts; |
|
__u32 ts_status; |
|
bool is_drop_n_account = false; |
|
unsigned int slot_id = 0; |
|
bool do_vnet = false; |
|
|
|
/* struct tpacket{2,3}_hdr is aligned to a multiple of TPACKET_ALIGNMENT. |
|
* We may add members to them until current aligned size without forcing |
|
* userspace to call getsockopt(..., PACKET_HDRLEN, ...). |
|
*/ |
|
BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h2)) != 32); |
|
BUILD_BUG_ON(TPACKET_ALIGN(sizeof(*h.h3)) != 48); |
|
|
|
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_has_header(dev)) { |
|
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 we are flooded, just give up */ |
|
if (__packet_rcv_has_room(po, skb) == ROOM_NONE) { |
|
atomic_inc(&po->tp_drops); |
|
goto drop_n_restore; |
|
} |
|
|
|
if (skb->ip_summed == CHECKSUM_PARTIAL) |
|
status |= TP_STATUS_CSUMNOTREADY; |
|
else if (skb->pkt_type != PACKET_OUTGOING && |
|
(skb->ip_summed == CHECKSUM_COMPLETE || |
|
skb_csum_unnecessary(skb))) |
|
status |= TP_STATUS_CSUM_VALID; |
|
|
|
if (snaplen > res) |
|
snaplen = res; |
|
|
|
if (sk->sk_type == SOCK_DGRAM) { |
|
macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 + |
|
po->tp_reserve; |
|
} else { |
|
unsigned int maclen = skb_network_offset(skb); |
|
netoff = TPACKET_ALIGN(po->tp_hdrlen + |
|
(maclen < 16 ? 16 : maclen)) + |
|
po->tp_reserve; |
|
if (po->has_vnet_hdr) { |
|
netoff += sizeof(struct virtio_net_hdr); |
|
do_vnet = true; |
|
} |
|
macoff = netoff - maclen; |
|
} |
|
if (netoff > USHRT_MAX) { |
|
atomic_inc(&po->tp_drops); |
|
goto drop_n_restore; |
|
} |
|
if (po->tp_version <= TPACKET_V2) { |
|
if (macoff + snaplen > po->rx_ring.frame_size) { |
|
if (po->copy_thresh && |
|
atomic_read(&sk->sk_rmem_alloc) < 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; |
|
do_vnet = false; |
|
} |
|
} |
|
} else if (unlikely(macoff + snaplen > |
|
GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len)) { |
|
u32 nval; |
|
|
|
nval = GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len - macoff; |
|
pr_err_once("tpacket_rcv: packet too big, clamped from %u to %u. macoff=%u\n", |
|
snaplen, nval, macoff); |
|
snaplen = nval; |
|
if (unlikely((int)snaplen < 0)) { |
|
snaplen = 0; |
|
macoff = GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len; |
|
do_vnet = false; |
|
} |
|
} |
|
spin_lock(&sk->sk_receive_queue.lock); |
|
h.raw = packet_current_rx_frame(po, skb, |
|
TP_STATUS_KERNEL, (macoff+snaplen)); |
|
if (!h.raw) |
|
goto drop_n_account; |
|
|
|
if (po->tp_version <= TPACKET_V2) { |
|
slot_id = po->rx_ring.head; |
|
if (test_bit(slot_id, po->rx_ring.rx_owner_map)) |
|
goto drop_n_account; |
|
__set_bit(slot_id, po->rx_ring.rx_owner_map); |
|
} |
|
|
|
if (do_vnet && |
|
virtio_net_hdr_from_skb(skb, h.raw + macoff - |
|
sizeof(struct virtio_net_hdr), |
|
vio_le(), true, 0)) { |
|
if (po->tp_version == TPACKET_V3) |
|
prb_clear_blk_fill_status(&po->rx_ring); |
|
goto drop_n_account; |
|
} |
|
|
|
if (po->tp_version <= TPACKET_V2) { |
|
packet_increment_rx_head(po, &po->rx_ring); |
|
/* |
|
* LOSING will be reported till you read the stats, |
|
* because it's COR - Clear On Read. |
|
* Anyways, moving it for V1/V2 only as V3 doesn't need this |
|
* at packet level. |
|
*/ |
|
if (atomic_read(&po->tp_drops)) |
|
status |= TP_STATUS_LOSING; |
|
} |
|
|
|
po->stats.stats1.tp_packets++; |
|
if (copy_skb) { |
|
status |= TP_STATUS_COPY; |
|
__skb_queue_tail(&sk->sk_receive_queue, copy_skb); |
|
} |
|
spin_unlock(&sk->sk_receive_queue.lock); |
|
|
|
skb_copy_bits(skb, 0, h.raw + macoff, snaplen); |
|
|
|
/* Always timestamp; prefer an existing software timestamp taken |
|
* closer to the time of capture. |
|
*/ |
|
ts_status = tpacket_get_timestamp(skb, &ts, |
|
po->tp_tstamp | SOF_TIMESTAMPING_SOFTWARE); |
|
if (!ts_status) |
|
ktime_get_real_ts64(&ts); |
|
|
|
status |= ts_status; |
|
|
|
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; |
|
h.h1->tp_sec = ts.tv_sec; |
|
h.h1->tp_usec = ts.tv_nsec / NSEC_PER_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; |
|
h.h2->tp_sec = ts.tv_sec; |
|
h.h2->tp_nsec = ts.tv_nsec; |
|
if (skb_vlan_tag_present(skb)) { |
|
h.h2->tp_vlan_tci = skb_vlan_tag_get(skb); |
|
h.h2->tp_vlan_tpid = ntohs(skb->vlan_proto); |
|
status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID; |
|
} else { |
|
h.h2->tp_vlan_tci = 0; |
|
h.h2->tp_vlan_tpid = 0; |
|
} |
|
memset(h.h2->tp_padding, 0, sizeof(h.h2->tp_padding)); |
|
hdrlen = sizeof(*h.h2); |
|
break; |
|
case TPACKET_V3: |
|
/* tp_nxt_offset,vlan are already populated above. |
|
* So DONT clear those fields here |
|
*/ |
|
h.h3->tp_status |= status; |
|
h.h3->tp_len = skb->len; |
|
h.h3->tp_snaplen = snaplen; |
|
h.h3->tp_mac = macoff; |
|
h.h3->tp_net = netoff; |
|
h.h3->tp_sec = ts.tv_sec; |
|
h.h3->tp_nsec = ts.tv_nsec; |
|
memset(h.h3->tp_padding, 0, sizeof(h.h3->tp_padding)); |
|
hdrlen = sizeof(*h.h3); |
|
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; |
|
|
|
smp_mb(); |
|
|
|
#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1 |
|
if (po->tp_version <= TPACKET_V2) { |
|
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)); |
|
} |
|
smp_wmb(); |
|
#endif |
|
|
|
if (po->tp_version <= TPACKET_V2) { |
|
spin_lock(&sk->sk_receive_queue.lock); |
|
__packet_set_status(po, h.raw, status); |
|
__clear_bit(slot_id, po->rx_ring.rx_owner_map); |
|
spin_unlock(&sk->sk_receive_queue.lock); |
|
sk->sk_data_ready(sk); |
|
} else if (po->tp_version == TPACKET_V3) { |
|
prb_clear_blk_fill_status(&po->rx_ring); |
|
} |
|
|
|
drop_n_restore: |
|
if (skb_head != skb->data && skb_shared(skb)) { |
|
skb->data = skb_head; |
|
skb->len = skb_len; |
|
} |
|
drop: |
|
if (!is_drop_n_account) |
|
consume_skb(skb); |
|
else |
|
kfree_skb(skb); |
|
return 0; |
|
|
|
drop_n_account: |
|
spin_unlock(&sk->sk_receive_queue.lock); |
|
atomic_inc(&po->tp_drops); |
|
is_drop_n_account = true; |
|
|
|
sk->sk_data_ready(sk); |
|
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); |
|
|
|
if (likely(po->tx_ring.pg_vec)) { |
|
void *ph; |
|
__u32 ts; |
|
|
|
ph = skb_zcopy_get_nouarg(skb); |
|
packet_dec_pending(&po->tx_ring); |
|
|
|
ts = __packet_set_timestamp(po, ph, skb); |
|
__packet_set_status(po, ph, TP_STATUS_AVAILABLE | ts); |
|
|
|
if (!packet_read_pending(&po->tx_ring)) |
|
complete(&po->skb_completion); |
|
} |
|
|
|
sock_wfree(skb); |
|
} |
|
|
|
static int __packet_snd_vnet_parse(struct virtio_net_hdr *vnet_hdr, size_t len) |
|
{ |
|
if ((vnet_hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && |
|
(__virtio16_to_cpu(vio_le(), vnet_hdr->csum_start) + |
|
__virtio16_to_cpu(vio_le(), vnet_hdr->csum_offset) + 2 > |
|
__virtio16_to_cpu(vio_le(), vnet_hdr->hdr_len))) |
|
vnet_hdr->hdr_len = __cpu_to_virtio16(vio_le(), |
|
__virtio16_to_cpu(vio_le(), vnet_hdr->csum_start) + |
|
__virtio16_to_cpu(vio_le(), vnet_hdr->csum_offset) + 2); |
|
|
|
if (__virtio16_to_cpu(vio_le(), vnet_hdr->hdr_len) > len) |
|
return -EINVAL; |
|
|
|
return 0; |
|
} |
|
|
|
static int packet_snd_vnet_parse(struct msghdr *msg, size_t *len, |
|
struct virtio_net_hdr *vnet_hdr) |
|
{ |
|
if (*len < sizeof(*vnet_hdr)) |
|
return -EINVAL; |
|
*len -= sizeof(*vnet_hdr); |
|
|
|
if (!copy_from_iter_full(vnet_hdr, sizeof(*vnet_hdr), &msg->msg_iter)) |
|
return -EFAULT; |
|
|
|
return __packet_snd_vnet_parse(vnet_hdr, *len); |
|
} |
|
|
|
static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb, |
|
void *frame, struct net_device *dev, void *data, int tp_len, |
|
__be16 proto, unsigned char *addr, int hlen, int copylen, |
|
const struct sockcm_cookie *sockc) |
|
{ |
|
union tpacket_uhdr ph; |
|
int to_write, offset, len, nr_frags, len_max; |
|
struct socket *sock = po->sk.sk_socket; |
|
struct page *page; |
|
int err; |
|
|
|
ph.raw = frame; |
|
|
|
skb->protocol = proto; |
|
skb->dev = dev; |
|
skb->priority = po->sk.sk_priority; |
|
skb->mark = po->sk.sk_mark; |
|
skb->tstamp = sockc->transmit_time; |
|
skb_setup_tx_timestamp(skb, sockc->tsflags); |
|
skb_zcopy_set_nouarg(skb, ph.raw); |
|
|
|
skb_reserve(skb, hlen); |
|
skb_reset_network_header(skb); |
|
|
|
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 (copylen) { |
|
int hdrlen = min_t(int, copylen, tp_len); |
|
|
|
skb_push(skb, dev->hard_header_len); |
|
skb_put(skb, copylen - dev->hard_header_len); |
|
err = skb_store_bits(skb, 0, data, hdrlen); |
|
if (unlikely(err)) |
|
return err; |
|
if (!dev_validate_header(dev, skb->data, hdrlen)) |
|
return -EINVAL; |
|
|
|
data += hdrlen; |
|
to_write -= hdrlen; |
|
} |
|
|
|
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; |
|
refcount_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); |
|
} |
|
|
|
packet_parse_headers(skb, sock); |
|
|
|
return tp_len; |
|
} |
|
|
|
static int tpacket_parse_header(struct packet_sock *po, void *frame, |
|
int size_max, void **data) |
|
{ |
|
union tpacket_uhdr ph; |
|
int tp_len, off; |
|
|
|
ph.raw = frame; |
|
|
|
switch (po->tp_version) { |
|
case TPACKET_V3: |
|
if (ph.h3->tp_next_offset != 0) { |
|
pr_warn_once("variable sized slot not supported"); |
|
return -EINVAL; |
|
} |
|
tp_len = ph.h3->tp_len; |
|
break; |
|
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; |
|
} |
|
|
|
if (unlikely(po->tp_tx_has_off)) { |
|
int off_min, off_max; |
|
|
|
off_min = po->tp_hdrlen - sizeof(struct sockaddr_ll); |
|
off_max = po->tx_ring.frame_size - tp_len; |
|
if (po->sk.sk_type == SOCK_DGRAM) { |
|
switch (po->tp_version) { |
|
case TPACKET_V3: |
|
off = ph.h3->tp_net; |
|
break; |
|
case TPACKET_V2: |
|
off = ph.h2->tp_net; |
|
break; |
|
default: |
|
off = ph.h1->tp_net; |
|
break; |
|
} |
|
} else { |
|
switch (po->tp_version) { |
|
case TPACKET_V3: |
|
off = ph.h3->tp_mac; |
|
break; |
|
case TPACKET_V2: |
|
off = ph.h2->tp_mac; |
|
break; |
|
default: |
|
off = ph.h1->tp_mac; |
|
break; |
|
} |
|
} |
|
if (unlikely((off < off_min) || (off_max < off))) |
|
return -EINVAL; |
|
} else { |
|
off = po->tp_hdrlen - sizeof(struct sockaddr_ll); |
|
} |
|
|
|
*data = frame + off; |
|
return tp_len; |
|
} |
|
|
|
static int tpacket_snd(struct packet_sock *po, struct msghdr *msg) |
|
{ |
|
struct sk_buff *skb = NULL; |
|
struct net_device *dev; |
|
struct virtio_net_hdr *vnet_hdr = NULL; |
|
struct sockcm_cookie sockc; |
|
__be16 proto; |
|
int err, reserve = 0; |
|
void *ph; |
|
DECLARE_SOCKADDR(struct sockaddr_ll *, saddr, msg->msg_name); |
|
bool need_wait = !(msg->msg_flags & MSG_DONTWAIT); |
|
unsigned char *addr = NULL; |
|
int tp_len, size_max; |
|
void *data; |
|
int len_sum = 0; |
|
int status = TP_STATUS_AVAILABLE; |
|
int hlen, tlen, copylen = 0; |
|
long timeo = 0; |
|
|
|
mutex_lock(&po->pg_vec_lock); |
|
|
|
/* packet_sendmsg() check on tx_ring.pg_vec was lockless, |
|
* we need to confirm it under protection of pg_vec_lock. |
|
*/ |
|
if (unlikely(!po->tx_ring.pg_vec)) { |
|
err = -EBUSY; |
|
goto out; |
|
} |
|
if (likely(saddr == NULL)) { |
|
dev = packet_cached_dev_get(po); |
|
proto = READ_ONCE(po->num); |
|
} 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; |
|
dev = dev_get_by_index(sock_net(&po->sk), saddr->sll_ifindex); |
|
if (po->sk.sk_socket->type == SOCK_DGRAM) { |
|
if (dev && msg->msg_namelen < dev->addr_len + |
|
offsetof(struct sockaddr_ll, sll_addr)) |
|
goto out_put; |
|
addr = saddr->sll_addr; |
|
} |
|
} |
|
|
|
err = -ENXIO; |
|
if (unlikely(dev == NULL)) |
|
goto out; |
|
err = -ENETDOWN; |
|
if (unlikely(!(dev->flags & IFF_UP))) |
|
goto out_put; |
|
|
|
sockcm_init(&sockc, &po->sk); |
|
if (msg->msg_controllen) { |
|
err = sock_cmsg_send(&po->sk, msg, &sockc); |
|
if (unlikely(err)) |
|
goto out_put; |
|
} |
|
|
|
if (po->sk.sk_socket->type == SOCK_RAW) |
|
reserve = dev->hard_header_len; |
|
size_max = po->tx_ring.frame_size |
|
- (po->tp_hdrlen - sizeof(struct sockaddr_ll)); |
|
|
|
if ((size_max > dev->mtu + reserve + VLAN_HLEN) && !po->has_vnet_hdr) |
|
size_max = dev->mtu + reserve + VLAN_HLEN; |
|
|
|
reinit_completion(&po->skb_completion); |
|
|
|
do { |
|
ph = packet_current_frame(po, &po->tx_ring, |
|
TP_STATUS_SEND_REQUEST); |
|
if (unlikely(ph == NULL)) { |
|
if (need_wait && skb) { |
|
timeo = sock_sndtimeo(&po->sk, msg->msg_flags & MSG_DONTWAIT); |
|
timeo = wait_for_completion_interruptible_timeout(&po->skb_completion, timeo); |
|
if (timeo <= 0) { |
|
err = !timeo ? -ETIMEDOUT : -ERESTARTSYS; |
|
goto out_put; |
|
} |
|
} |
|
/* check for additional frames */ |
|
continue; |
|
} |
|
|
|
skb = NULL; |
|
tp_len = tpacket_parse_header(po, ph, size_max, &data); |
|
if (tp_len < 0) |
|
goto tpacket_error; |
|
|
|
status = TP_STATUS_SEND_REQUEST; |
|
hlen = LL_RESERVED_SPACE(dev); |
|
tlen = dev->needed_tailroom; |
|
if (po->has_vnet_hdr) { |
|
vnet_hdr = data; |
|
data += sizeof(*vnet_hdr); |
|
tp_len -= sizeof(*vnet_hdr); |
|
if (tp_len < 0 || |
|
__packet_snd_vnet_parse(vnet_hdr, tp_len)) { |
|
tp_len = -EINVAL; |
|
goto tpacket_error; |
|
} |
|
copylen = __virtio16_to_cpu(vio_le(), |
|
vnet_hdr->hdr_len); |
|
} |
|
copylen = max_t(int, copylen, dev->hard_header_len); |
|
skb = sock_alloc_send_skb(&po->sk, |
|
hlen + tlen + sizeof(struct sockaddr_ll) + |
|
(copylen - dev->hard_header_len), |
|
!need_wait, &err); |
|
|
|
if (unlikely(skb == NULL)) { |
|
/* we assume the socket was initially writeable ... */ |
|
if (likely(len_sum > 0)) |
|
err = len_sum; |
|
goto out_status; |
|
} |
|
tp_len = tpacket_fill_skb(po, skb, ph, dev, data, tp_len, proto, |
|
addr, hlen, copylen, &sockc); |
|
if (likely(tp_len >= 0) && |
|
tp_len > dev->mtu + reserve && |
|
!po->has_vnet_hdr && |
|
!packet_extra_vlan_len_allowed(dev, skb)) |
|
tp_len = -EMSGSIZE; |
|
|
|
if (unlikely(tp_len < 0)) { |
|
tpacket_error: |
|
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; |
|
} |
|
} |
|
|
|
if (po->has_vnet_hdr) { |
|
if (virtio_net_hdr_to_skb(skb, vnet_hdr, vio_le())) { |
|
tp_len = -EINVAL; |
|
goto tpacket_error; |
|
} |
|
virtio_net_hdr_set_proto(skb, vnet_hdr); |
|
} |
|
|
|
skb->destructor = tpacket_destruct_skb; |
|
__packet_set_status(po, ph, TP_STATUS_SENDING); |
|
packet_inc_pending(&po->tx_ring); |
|
|
|
status = TP_STATUS_SEND_REQUEST; |
|
err = po->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) || |
|
/* Note: packet_read_pending() might be slow if we have |
|
* to call it as it's per_cpu variable, but in fast-path |
|
* we already short-circuit the loop with the first |
|
* condition, and luckily don't have to go that path |
|
* anyway. |
|
*/ |
|
(need_wait && packet_read_pending(&po->tx_ring)))); |
|
|
|
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 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, 0); |
|
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; |
|
DECLARE_SOCKADDR(struct sockaddr_ll *, saddr, msg->msg_name); |
|
struct sk_buff *skb; |
|
struct net_device *dev; |
|
__be16 proto; |
|
unsigned char *addr = NULL; |
|
int err, reserve = 0; |
|
struct sockcm_cookie sockc; |
|
struct virtio_net_hdr vnet_hdr = { 0 }; |
|
int offset = 0; |
|
struct packet_sock *po = pkt_sk(sk); |
|
bool has_vnet_hdr = false; |
|
int hlen, tlen, linear; |
|
int extra_len = 0; |
|
|
|
/* |
|
* Get and verify the address. |
|
*/ |
|
|
|
if (likely(saddr == NULL)) { |
|
dev = packet_cached_dev_get(po); |
|
proto = READ_ONCE(po->num); |
|
} 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; |
|
dev = dev_get_by_index(sock_net(sk), saddr->sll_ifindex); |
|
if (sock->type == SOCK_DGRAM) { |
|
if (dev && msg->msg_namelen < dev->addr_len + |
|
offsetof(struct sockaddr_ll, sll_addr)) |
|
goto out_unlock; |
|
addr = saddr->sll_addr; |
|
} |
|
} |
|
|
|
err = -ENXIO; |
|
if (unlikely(dev == NULL)) |
|
goto out_unlock; |
|
err = -ENETDOWN; |
|
if (unlikely(!(dev->flags & IFF_UP))) |
|
goto out_unlock; |
|
|
|
sockcm_init(&sockc, sk); |
|
sockc.mark = sk->sk_mark; |
|
if (msg->msg_controllen) { |
|
err = sock_cmsg_send(sk, msg, &sockc); |
|
if (unlikely(err)) |
|
goto out_unlock; |
|
} |
|
|
|
if (sock->type == SOCK_RAW) |
|
reserve = dev->hard_header_len; |
|
if (po->has_vnet_hdr) { |
|
err = packet_snd_vnet_parse(msg, &len, &vnet_hdr); |
|
if (err) |
|
goto out_unlock; |
|
has_vnet_hdr = true; |
|
} |
|
|
|
if (unlikely(sock_flag(sk, SOCK_NOFCS))) { |
|
if (!netif_supports_nofcs(dev)) { |
|
err = -EPROTONOSUPPORT; |
|
goto out_unlock; |
|
} |
|
extra_len = 4; /* We're doing our own CRC */ |
|
} |
|
|
|
err = -EMSGSIZE; |
|
if (!vnet_hdr.gso_type && |
|
(len > dev->mtu + reserve + VLAN_HLEN + extra_len)) |
|
goto out_unlock; |
|
|
|
err = -ENOBUFS; |
|
hlen = LL_RESERVED_SPACE(dev); |
|
tlen = dev->needed_tailroom; |
|
linear = __virtio16_to_cpu(vio_le(), vnet_hdr.hdr_len); |
|
linear = max(linear, min_t(int, len, dev->hard_header_len)); |
|
skb = packet_alloc_skb(sk, hlen + tlen, hlen, len, linear, |
|
msg->msg_flags & MSG_DONTWAIT, &err); |
|
if (skb == NULL) |
|
goto out_unlock; |
|
|
|
skb_reset_network_header(skb); |
|
|
|
err = -EINVAL; |
|
if (sock->type == SOCK_DGRAM) { |
|
offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len); |
|
if (unlikely(offset < 0)) |
|
goto out_free; |
|
} else if (reserve) { |
|
skb_reserve(skb, -reserve); |
|
if (len < reserve + sizeof(struct ipv6hdr) && |
|
dev->min_header_len != dev->hard_header_len) |
|
skb_reset_network_header(skb); |
|
} |
|
|
|
/* Returns -EFAULT on error */ |
|
err = skb_copy_datagram_from_iter(skb, offset, &msg->msg_iter, len); |
|
if (err) |
|
goto out_free; |
|
|
|
if (sock->type == SOCK_RAW && |
|
!dev_validate_header(dev, skb->data, len)) { |
|
err = -EINVAL; |
|
goto out_free; |
|
} |
|
|
|
skb_setup_tx_timestamp(skb, sockc.tsflags); |
|
|
|
if (!vnet_hdr.gso_type && (len > dev->mtu + reserve + extra_len) && |
|
!packet_extra_vlan_len_allowed(dev, skb)) { |
|
err = -EMSGSIZE; |
|
goto out_free; |
|
} |
|
|
|
skb->protocol = proto; |
|
skb->dev = dev; |
|
skb->priority = sk->sk_priority; |
|
skb->mark = sockc.mark; |
|
skb->tstamp = sockc.transmit_time; |
|
|
|
if (has_vnet_hdr) { |
|
err = virtio_net_hdr_to_skb(skb, &vnet_hdr, vio_le()); |
|
if (err) |
|
goto out_free; |
|
len += sizeof(vnet_hdr); |
|
virtio_net_hdr_set_proto(skb, &vnet_hdr); |
|
} |
|
|
|
packet_parse_headers(skb, sock); |
|
|
|
if (unlikely(extra_len == 4)) |
|
skb->no_fcs = 1; |
|
|
|
err = po->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: |
|
dev_put(dev); |
|
out: |
|
return err; |
|
} |
|
|
|
static int packet_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) |
|
{ |
|
struct sock *sk = sock->sk; |
|
struct packet_sock *po = pkt_sk(sk); |
|
|
|
/* Reading tx_ring.pg_vec without holding pg_vec_lock is racy. |
|
* tpacket_snd() will redo the check safely. |
|
*/ |
|
if (data_race(po->tx_ring.pg_vec)) |
|
return tpacket_snd(po, msg); |
|
|
|
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 packet_fanout *f; |
|
struct net *net; |
|
union tpacket_req_u req_u; |
|
|
|
if (!sk) |
|
return 0; |
|
|
|
net = sock_net(sk); |
|
po = pkt_sk(sk); |
|
|
|
mutex_lock(&net->packet.sklist_lock); |
|
sk_del_node_init_rcu(sk); |
|
mutex_unlock(&net->packet.sklist_lock); |
|
|
|
preempt_disable(); |
|
sock_prot_inuse_add(net, sk->sk_prot, -1); |
|
preempt_enable(); |
|
|
|
spin_lock(&po->bind_lock); |
|
unregister_prot_hook(sk, false); |
|
packet_cached_dev_reset(po); |
|
|
|
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); |
|
|
|
lock_sock(sk); |
|
if (po->rx_ring.pg_vec) { |
|
memset(&req_u, 0, sizeof(req_u)); |
|
packet_set_ring(sk, &req_u, 1, 0); |
|
} |
|
|
|
if (po->tx_ring.pg_vec) { |
|
memset(&req_u, 0, sizeof(req_u)); |
|
packet_set_ring(sk, &req_u, 1, 1); |
|
} |
|
release_sock(sk); |
|
|
|
f = fanout_release(sk); |
|
|
|
synchronize_net(); |
|
|
|
kfree(po->rollover); |
|
if (f) { |
|
fanout_release_data(f); |
|
kvfree(f); |
|
} |
|
/* |
|
* 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); |
|
packet_free_pending(po); |
|
sk_refcnt_debug_release(sk); |
|
|
|
sock_put(sk); |
|
return 0; |
|
} |
|
|
|
/* |
|
* Attach a packet hook. |
|
*/ |
|
|
|
static int packet_do_bind(struct sock *sk, const char *name, int ifindex, |
|
__be16 proto) |
|
{ |
|
struct packet_sock *po = pkt_sk(sk); |
|
struct net_device *dev_curr; |
|
__be16 proto_curr; |
|
bool need_rehook; |
|
struct net_device *dev = NULL; |
|
int ret = 0; |
|
bool unlisted = false; |
|
|
|
lock_sock(sk); |
|
spin_lock(&po->bind_lock); |
|
rcu_read_lock(); |
|
|
|
if (po->fanout) { |
|
ret = -EINVAL; |
|
goto out_unlock; |
|
} |
|
|
|
if (name) { |
|
dev = dev_get_by_name_rcu(sock_net(sk), name); |
|
if (!dev) { |
|
ret = -ENODEV; |
|
goto out_unlock; |
|
} |
|
} else if (ifindex) { |
|
dev = dev_get_by_index_rcu(sock_net(sk), ifindex); |
|
if (!dev) { |
|
ret = -ENODEV; |
|
goto out_unlock; |
|
} |
|
} |
|
|
|
dev_hold(dev); |
|
|
|
proto_curr = po->prot_hook.type; |
|
dev_curr = po->prot_hook.dev; |
|
|
|
need_rehook = proto_curr != proto || dev_curr != dev; |
|
|
|
if (need_rehook) { |
|
if (po->running) { |
|
rcu_read_unlock(); |
|
/* prevents packet_notifier() from calling |
|
* register_prot_hook() |
|
*/ |
|
WRITE_ONCE(po->num, 0); |
|
__unregister_prot_hook(sk, true); |
|
rcu_read_lock(); |
|
dev_curr = po->prot_hook.dev; |
|
if (dev) |
|
unlisted = !dev_get_by_index_rcu(sock_net(sk), |
|
dev->ifindex); |
|
} |
|
|
|
BUG_ON(po->running); |
|
WRITE_ONCE(po->num, proto); |
|
po->prot_hook.type = proto; |
|
|
|
if (unlikely(unlisted)) { |
|
dev_put(dev); |
|
po->prot_hook.dev = NULL; |
|
WRITE_ONCE(po->ifindex, -1); |
|
packet_cached_dev_reset(po); |
|
} else { |
|
po->prot_hook.dev = dev; |
|
WRITE_ONCE(po->ifindex, dev ? dev->ifindex : 0); |
|
packet_cached_dev_assign(po, dev); |
|
} |
|
} |
|
dev_put(dev_curr); |
|
|
|
if (proto == 0 || !need_rehook) |
|
goto out_unlock; |
|
|
|
if (!unlisted && (!dev || (dev->flags & IFF_UP))) { |
|
register_prot_hook(sk); |
|
} else { |
|
sk->sk_err = ENETDOWN; |
|
if (!sock_flag(sk, SOCK_DEAD)) |
|
sk_error_report(sk); |
|
} |
|
|
|
out_unlock: |
|
rcu_read_unlock(); |
|
spin_unlock(&po->bind_lock); |
|
release_sock(sk); |
|
return ret; |
|
} |
|
|
|
/* |
|
* 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[sizeof(uaddr->sa_data) + 1]; |
|
|
|
/* |
|
* Check legality |
|
*/ |
|
|
|
if (addr_len != sizeof(struct sockaddr)) |
|
return -EINVAL; |
|
/* uaddr->sa_data comes from the userspace, it's not guaranteed to be |
|
* zero-terminated. |
|
*/ |
|
memcpy(name, uaddr->sa_data, sizeof(uaddr->sa_data)); |
|
name[sizeof(uaddr->sa_data)] = 0; |
|
|
|
return packet_do_bind(sk, name, 0, pkt_sk(sk)->num); |
|
} |
|
|
|
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; |
|
|
|
/* |
|
* Check legality |
|
*/ |
|
|
|
if (addr_len < sizeof(struct sockaddr_ll)) |
|
return -EINVAL; |
|
if (sll->sll_family != AF_PACKET) |
|
return -EINVAL; |
|
|
|
return packet_do_bind(sk, NULL, sll->sll_ifindex, |
|
sll->sll_protocol ? : pkt_sk(sk)->num); |
|
} |
|
|
|
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 (!ns_capable(net->user_ns, 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, kern); |
|
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); |
|
init_completion(&po->skb_completion); |
|
sk->sk_family = PF_PACKET; |
|
po->num = proto; |
|
po->xmit = dev_queue_xmit; |
|
|
|
err = packet_alloc_pending(po); |
|
if (err) |
|
goto out2; |
|
|
|
packet_cached_dev_reset(po); |
|
|
|
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->rollover = NULL; |
|
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; |
|
__register_prot_hook(sk); |
|
} |
|
|
|
mutex_lock(&net->packet.sklist_lock); |
|
sk_add_node_tail_rcu(sk, &net->packet.sklist); |
|
mutex_unlock(&net->packet.sklist_lock); |
|
|
|
preempt_disable(); |
|
sock_prot_inuse_add(net, &packet_proto, 1); |
|
preempt_enable(); |
|
|
|
return 0; |
|
out2: |
|
sk_free(sk); |
|
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 socket *sock, struct msghdr *msg, size_t len, |
|
int flags) |
|
{ |
|
struct sock *sk = sock->sk; |
|
struct sk_buff *skb; |
|
int copied, err; |
|
int vnet_hdr_len = 0; |
|
unsigned int origlen = 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 = sock_recv_errqueue(sk, msg, len, |
|
SOL_PACKET, PACKET_TX_TIMESTAMP); |
|
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; |
|
|
|
packet_rcv_try_clear_pressure(pkt_sk(sk)); |
|
|
|
if (pkt_sk(sk)->has_vnet_hdr) { |
|
err = packet_rcv_vnet(msg, skb, &len); |
|
if (err) |
|
goto out_free; |
|
vnet_hdr_len = sizeof(struct virtio_net_hdr); |
|
} |
|
|
|
/* 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_msg(skb, 0, msg, copied); |
|
if (err) |
|
goto out_free; |
|
|
|
if (sock->type != SOCK_PACKET) { |
|
struct sockaddr_ll *sll = &PACKET_SKB_CB(skb)->sa.ll; |
|
|
|
/* Original length was stored in sockaddr_ll fields */ |
|
origlen = PACKET_SKB_CB(skb)->sa.origlen; |
|
sll->sll_family = AF_PACKET; |
|
sll->sll_protocol = skb->protocol; |
|
} |
|
|
|
sock_recv_ts_and_drops(msg, sk, skb); |
|
|
|
if (msg->msg_name) { |
|
int copy_len; |
|
|
|
/* If the address length field is there to be filled |
|
* in, we fill it in now. |
|
*/ |
|
if (sock->type == SOCK_PACKET) { |
|
__sockaddr_check_size(sizeof(struct sockaddr_pkt)); |
|
msg->msg_namelen = sizeof(struct sockaddr_pkt); |
|
copy_len = msg->msg_namelen; |
|
} else { |
|
struct sockaddr_ll *sll = &PACKET_SKB_CB(skb)->sa.ll; |
|
|
|
msg->msg_namelen = sll->sll_halen + |
|
offsetof(struct sockaddr_ll, sll_addr); |
|
copy_len = msg->msg_namelen; |
|
if (msg->msg_namelen < sizeof(struct sockaddr_ll)) { |
|
memset(msg->msg_name + |
|
offsetof(struct sockaddr_ll, sll_addr), |
|
0, sizeof(sll->sll_addr)); |
|
msg->msg_namelen = sizeof(struct sockaddr_ll); |
|
} |
|
} |
|
memcpy(msg->msg_name, &PACKET_SKB_CB(skb)->sa, copy_len); |
|
} |
|
|
|
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; |
|
else if (skb->pkt_type != PACKET_OUTGOING && |
|
(skb->ip_summed == CHECKSUM_COMPLETE || |
|
skb_csum_unnecessary(skb))) |
|
aux.tp_status |= TP_STATUS_CSUM_VALID; |
|
|
|
aux.tp_len = origlen; |
|
aux.tp_snaplen = skb->len; |
|
aux.tp_mac = 0; |
|
aux.tp_net = skb_network_offset(skb); |
|
if (skb_vlan_tag_present(skb)) { |
|
aux.tp_vlan_tci = skb_vlan_tag_get(skb); |
|
aux.tp_vlan_tpid = ntohs(skb->vlan_proto); |
|
aux.tp_status |= TP_STATUS_VLAN_VALID | TP_STATUS_VLAN_TPID_VALID; |
|
} else { |
|
aux.tp_vlan_tci = 0; |
|
aux.tp_vlan_tpid = 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 peer) |
|
{ |
|
struct net_device *dev; |
|
struct sock *sk = sock->sk; |
|
|
|
if (peer) |
|
return -EOPNOTSUPP; |
|
|
|
uaddr->sa_family = AF_PACKET; |
|
memset(uaddr->sa_data, 0, sizeof(uaddr->sa_data)); |
|
rcu_read_lock(); |
|
dev = dev_get_by_index_rcu(sock_net(sk), READ_ONCE(pkt_sk(sk)->ifindex)); |
|
if (dev) |
|
strlcpy(uaddr->sa_data, dev->name, sizeof(uaddr->sa_data)); |
|
rcu_read_unlock(); |
|
|
|
return sizeof(*uaddr); |
|
} |
|
|
|
static int packet_getname(struct socket *sock, struct sockaddr *uaddr, |
|
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); |
|
int ifindex; |
|
|
|
if (peer) |
|
return -EOPNOTSUPP; |
|
|
|
ifindex = READ_ONCE(po->ifindex); |
|
sll->sll_family = AF_PACKET; |
|
sll->sll_ifindex = ifindex; |
|
sll->sll_protocol = READ_ONCE(po->num); |
|
sll->sll_pkttype = 0; |
|
rcu_read_lock(); |
|
dev = dev_get_by_index_rcu(sock_net(sk), 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(); |
|
|
|
return offsetof(struct sockaddr_ll, sll_addr) + sll->sll_halen; |
|
} |
|
|
|
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); |
|
case PACKET_MR_ALLMULTI: |
|
return dev_set_allmulti(dev, what); |
|
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_delete(struct net_device *dev, |
|
struct packet_mclist **mlp) |
|
{ |
|
struct packet_mclist *ml; |
|
|
|
while ((ml = *mlp) != NULL) { |
|
if (ml->ifindex == dev->ifindex) { |
|
packet_dev_mc(dev, ml, -1); |
|
*mlp = ml->next; |
|
kfree(ml); |
|
} else |
|
mlp = &ml->next; |
|
} |
|
} |
|
|
|
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); |
|
memset(i->addr + i->alen, 0, sizeof(i->addr) - 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); |
|
} |
|
break; |
|
} |
|
} |
|
rtnl_unlock(); |
|
return 0; |
|
} |
|
|
|
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, sockptr_t 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_sockptr(&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: |
|
{ |
|
union tpacket_req_u req_u; |
|
int len; |
|
|
|
lock_sock(sk); |
|
switch (po->tp_version) { |
|
case TPACKET_V1: |
|
case TPACKET_V2: |
|
len = sizeof(req_u.req); |
|
break; |
|
case TPACKET_V3: |
|
default: |
|
len = sizeof(req_u.req3); |
|
break; |
|
} |
|
if (optlen < len) { |
|
ret = -EINVAL; |
|
} else { |
|
if (copy_from_sockptr(&req_u.req, optval, len)) |
|
ret = -EFAULT; |
|
else |
|
ret = packet_set_ring(sk, &req_u, 0, |
|
optname == PACKET_TX_RING); |
|
} |
|
release_sock(sk); |
|
return ret; |
|
} |
|
case PACKET_COPY_THRESH: |
|
{ |
|
int val; |
|
|
|
if (optlen != sizeof(val)) |
|
return -EINVAL; |
|
if (copy_from_sockptr(&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 (copy_from_sockptr(&val, optval, sizeof(val))) |
|
return -EFAULT; |
|
switch (val) { |
|
case TPACKET_V1: |
|
case TPACKET_V2: |
|
case TPACKET_V3: |
|
break; |
|
default: |
|
return -EINVAL; |
|
} |
|
lock_sock(sk); |
|
if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) { |
|
ret = -EBUSY; |
|
} else { |
|
po->tp_version = val; |
|
ret = 0; |
|
} |
|
release_sock(sk); |
|
return ret; |
|
} |
|
case PACKET_RESERVE: |
|
{ |
|
unsigned int val; |
|
|
|
if (optlen != sizeof(val)) |
|
return -EINVAL; |
|
if (copy_from_sockptr(&val, optval, sizeof(val))) |
|
return -EFAULT; |
|
if (val > INT_MAX) |
|
return -EINVAL; |
|
lock_sock(sk); |
|
if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) { |
|
ret = -EBUSY; |
|
} else { |
|
po->tp_reserve = val; |
|
ret = 0; |
|
} |
|
release_sock(sk); |
|
return ret; |
|
} |
|
case PACKET_LOSS: |
|
{ |
|
unsigned int val; |
|
|
|
if (optlen != sizeof(val)) |
|
return -EINVAL; |
|
if (copy_from_sockptr(&val, optval, sizeof(val))) |
|
return -EFAULT; |
|
|
|
lock_sock(sk); |
|
if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) { |
|
ret = -EBUSY; |
|
} else { |
|
po->tp_loss = !!val; |
|
ret = 0; |
|
} |
|
release_sock(sk); |
|
return ret; |
|
} |
|
case PACKET_AUXDATA: |
|
{ |
|
int val; |
|
|
|
if (optlen < sizeof(val)) |
|
return -EINVAL; |
|
if (copy_from_sockptr(&val, optval, sizeof(val))) |
|
return -EFAULT; |
|
|
|
lock_sock(sk); |
|
po->auxdata = !!val; |
|
release_sock(sk); |
|
return 0; |
|
} |
|
case PACKET_ORIGDEV: |
|
{ |
|
int val; |
|
|
|
if (optlen < sizeof(val)) |
|
return -EINVAL; |
|
if (copy_from_sockptr(&val, optval, sizeof(val))) |
|
return -EFAULT; |
|
|
|
lock_sock(sk); |
|
po->origdev = !!val; |
|
release_sock(sk); |
|
return 0; |
|
} |
|
case PACKET_VNET_HDR: |
|
{ |
|
int val; |
|
|
|
if (sock->type != SOCK_RAW) |
|
return -EINVAL; |
|
if (optlen < sizeof(val)) |
|
return -EINVAL; |
|
if (copy_from_sockptr(&val, optval, sizeof(val))) |
|
return -EFAULT; |
|
|
|
lock_sock(sk); |
|
if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) { |
|
ret = -EBUSY; |
|
} else { |
|
po->has_vnet_hdr = !!val; |
|
ret = 0; |
|
} |
|
release_sock(sk); |
|
return ret; |
|
} |
|
case PACKET_TIMESTAMP: |
|
{ |
|
int val; |
|
|
|
if (optlen != sizeof(val)) |
|
return -EINVAL; |
|
if (copy_from_sockptr(&val, optval, sizeof(val))) |
|
return -EFAULT; |
|
|
|
po->tp_tstamp = val; |
|
return 0; |
|
} |
|
case PACKET_FANOUT: |
|
{ |
|
struct fanout_args args = { 0 }; |
|
|
|
if (optlen != sizeof(int) && optlen != sizeof(args)) |
|
return -EINVAL; |
|
if (copy_from_sockptr(&args, optval, optlen)) |
|
return -EFAULT; |
|
|
|
return fanout_add(sk, &args); |
|
} |
|
case PACKET_FANOUT_DATA: |
|
{ |
|
if (!po->fanout) |
|
return -EINVAL; |
|
|
|
return fanout_set_data(po, optval, optlen); |
|
} |
|
case PACKET_IGNORE_OUTGOING: |
|
{ |
|
int val; |
|
|
|
if (optlen != sizeof(val)) |
|
return -EINVAL; |
|
if (copy_from_sockptr(&val, optval, sizeof(val))) |
|
return -EFAULT; |
|
if (val < 0 || val > 1) |
|
return -EINVAL; |
|
|
|
po->prot_hook.ignore_outgoing = !!val; |
|
return 0; |
|
} |
|
case PACKET_TX_HAS_OFF: |
|
{ |
|
unsigned int val; |
|
|
|
if (optlen != sizeof(val)) |
|
return -EINVAL; |
|
if (copy_from_sockptr(&val, optval, sizeof(val))) |
|
return -EFAULT; |
|
|
|
lock_sock(sk); |
|
if (!po->rx_ring.pg_vec && !po->tx_ring.pg_vec) |
|
po->tp_tx_has_off = !!val; |
|
|
|
release_sock(sk); |
|
return 0; |
|
} |
|
case PACKET_QDISC_BYPASS: |
|
{ |
|
int val; |
|
|
|
if (optlen != sizeof(val)) |
|
return -EINVAL; |
|
if (copy_from_sockptr(&val, optval, sizeof(val))) |
|
return -EFAULT; |
|
|
|
po->xmit = val ? packet_direct_xmit : dev_queue_xmit; |
|
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, lv = sizeof(val); |
|
struct sock *sk = sock->sk; |
|
struct packet_sock *po = pkt_sk(sk); |
|
void *data = &val; |
|
union tpacket_stats_u st; |
|
struct tpacket_rollover_stats rstats; |
|
int drops; |
|
|
|
if (level != SOL_PACKET) |
|
return -ENOPROTOOPT; |
|
|
|
if (get_user(len, optlen)) |
|
return -EFAULT; |
|
|
|
if (len < 0) |
|
return -EINVAL; |
|
|
|
switch (optname) { |
|
case PACKET_STATISTICS: |
|
spin_lock_bh(&sk->sk_receive_queue.lock); |
|
memcpy(&st, &po->stats, sizeof(st)); |
|
memset(&po->stats, 0, sizeof(po->stats)); |
|
spin_unlock_bh(&sk->sk_receive_queue.lock); |
|
drops = atomic_xchg(&po->tp_drops, 0); |
|
|
|
if (po->tp_version == TPACKET_V3) { |
|
lv = sizeof(struct tpacket_stats_v3); |
|
st.stats3.tp_drops = drops; |
|
st.stats3.tp_packets += drops; |
|
data = &st.stats3; |
|
} else { |
|
lv = sizeof(struct tpacket_stats); |
|
st.stats1.tp_drops = drops; |
|
st.stats1.tp_packets += drops; |
|
data = &st.stats1; |
|
} |
|
|
|
break; |
|
case PACKET_AUXDATA: |
|
val = po->auxdata; |
|
break; |
|
case PACKET_ORIGDEV: |
|
val = po->origdev; |
|
break; |
|
case PACKET_VNET_HDR: |
|
val = po->has_vnet_hdr; |
|
break; |
|
case PACKET_VERSION: |
|
val = po->tp_version; |
|
break; |
|
case PACKET_HDRLEN: |
|
if (len > sizeof(int)) |
|
len = sizeof(int); |
|
if (len < sizeof(int)) |
|
return -EINVAL; |
|
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; |
|
case TPACKET_V3: |
|
val = sizeof(struct tpacket3_hdr); |
|
break; |
|
default: |
|
return -EINVAL; |
|
} |
|
break; |
|
case PACKET_RESERVE: |
|
val = po->tp_reserve; |
|
break; |
|
case PACKET_LOSS: |
|
val = po->tp_loss; |
|
break; |
|
case PACKET_TIMESTAMP: |
|
val = po->tp_tstamp; |
|
break; |
|
case PACKET_FANOUT: |
|
val = (po->fanout ? |
|
((u32)po->fanout->id | |
|
((u32)po->fanout->type << 16) | |
|
((u32)po->fanout->flags << 24)) : |
|
0); |
|
break; |
|
case PACKET_IGNORE_OUTGOING: |
|
val = po->prot_hook.ignore_outgoing; |
|
break; |
|
case PACKET_ROLLOVER_STATS: |
|
if (!po->rollover) |
|
return -EINVAL; |
|
rstats.tp_all = atomic_long_read(&po->rollover->num); |
|
rstats.tp_huge = atomic_long_read(&po->rollover->num_huge); |
|
rstats.tp_failed = atomic_long_read(&po->rollover->num_failed); |
|
data = &rstats; |
|
lv = sizeof(rstats); |
|
break; |
|
case PACKET_TX_HAS_OFF: |
|
val = po->tp_tx_has_off; |
|
break; |
|
case PACKET_QDISC_BYPASS: |
|
val = packet_use_direct_xmit(po); |
|
break; |
|
default: |
|
return -ENOPROTOOPT; |
|
} |
|
|
|
if (len > lv) |
|
len = lv; |
|
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 *ptr) |
|
{ |
|
struct sock *sk; |
|
struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
|
struct net *net = dev_net(dev); |
|
|
|
rcu_read_lock(); |
|
sk_for_each_rcu(sk, &net->packet.sklist) { |
|
struct packet_sock *po = pkt_sk(sk); |
|
|
|
switch (msg) { |
|
case NETDEV_UNREGISTER: |
|
if (po->mclist) |
|
packet_dev_mclist_delete(dev, &po->mclist); |
|
fallthrough; |
|
|
|
case NETDEV_DOWN: |
|
if (dev->ifindex == po->ifindex) { |
|
spin_lock(&po->bind_lock); |
|
if (po->running) { |
|
__unregister_prot_hook(sk, false); |
|
sk->sk_err = ENETDOWN; |
|
if (!sock_flag(sk, SOCK_DEAD)) |
|
sk_error_report(sk); |
|
} |
|
if (msg == NETDEV_UNREGISTER) { |
|
packet_cached_dev_reset(po); |
|
WRITE_ONCE(po->ifindex, -1); |
|
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) |
|
register_prot_hook(sk); |
|
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); |
|
} |
|
#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 __poll_t packet_poll(struct file *file, struct socket *sock, |
|
poll_table *wait) |
|
{ |
|
struct sock *sk = sock->sk; |
|
struct packet_sock *po = pkt_sk(sk); |
|
__poll_t mask = datagram_poll(file, sock, wait); |
|
|
|
spin_lock_bh(&sk->sk_receive_queue.lock); |
|
if (po->rx_ring.pg_vec) { |
|
if (!packet_previous_rx_frame(po, &po->rx_ring, |
|
TP_STATUS_KERNEL)) |
|
mask |= EPOLLIN | EPOLLRDNORM; |
|
} |
|
packet_rcv_try_clear_pressure(po); |
|
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 |= EPOLLOUT | EPOLLWRNORM; |
|
} |
|
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 char *alloc_one_pg_vec_page(unsigned long order) |
|
{ |
|
char *buffer; |
|
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(array_size((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 | __GFP_NOWARN); |
|
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, union tpacket_req_u *req_u, |
|
int closing, int tx_ring) |
|
{ |
|
struct pgv *pg_vec = NULL; |
|
struct packet_sock *po = pkt_sk(sk); |
|
unsigned long *rx_owner_map = NULL; |
|
int was_running, order = 0; |
|
struct packet_ring_buffer *rb; |
|
struct sk_buff_head *rb_queue; |
|
__be16 num; |
|
int err; |
|
/* Added to avoid minimal code churn */ |
|
struct tpacket_req *req = &req_u->req; |
|
|
|
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 (packet_read_pending(rb)) |
|
goto out; |
|
} |
|
|
|
if (req->tp_block_nr) { |
|
unsigned int min_frame_size; |
|
|
|
/* 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; |
|
case TPACKET_V3: |
|
po->tp_hdrlen = TPACKET3_HDRLEN; |
|
break; |
|
} |
|
|
|
err = -EINVAL; |
|
if (unlikely((int)req->tp_block_size <= 0)) |
|
goto out; |
|
if (unlikely(!PAGE_ALIGNED(req->tp_block_size))) |
|
goto out; |
|
min_frame_size = po->tp_hdrlen + po->tp_reserve; |
|
if (po->tp_version >= TPACKET_V3 && |
|
req->tp_block_size < |
|
BLK_PLUS_PRIV((u64)req_u->req3.tp_sizeof_priv) + min_frame_size) |
|
goto out; |
|
if (unlikely(req->tp_frame_size < min_frame_size)) |
|
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 > UINT_MAX / req->tp_block_nr)) |
|
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; |
|
switch (po->tp_version) { |
|
case TPACKET_V3: |
|
/* Block transmit is not supported yet */ |
|
if (!tx_ring) { |
|
init_prb_bdqc(po, rb, pg_vec, req_u); |
|
} else { |
|
struct tpacket_req3 *req3 = &req_u->req3; |
|
|
|
if (req3->tp_retire_blk_tov || |
|
req3->tp_sizeof_priv || |
|
req3->tp_feature_req_word) { |
|
err = -EINVAL; |
|
goto out_free_pg_vec; |
|
} |
|
} |
|
break; |
|
default: |
|
if (!tx_ring) { |
|
rx_owner_map = bitmap_alloc(req->tp_frame_nr, |
|
GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO); |
|
if (!rx_owner_map) |
|
goto out_free_pg_vec; |
|
} |
|
break; |
|
} |
|
} |
|
/* Done */ |
|
else { |
|
err = -EINVAL; |
|
if (unlikely(req->tp_frame_nr)) |
|
goto out; |
|
} |
|
|
|
|
|
/* Detach socket from network */ |
|
spin_lock(&po->bind_lock); |
|
was_running = po->running; |
|
num = po->num; |
|
if (was_running) { |
|
WRITE_ONCE(po->num, 0); |
|
__unregister_prot_hook(sk, false); |
|
} |
|
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); |
|
if (po->tp_version <= TPACKET_V2) |
|
swap(rb->rx_owner_map, rx_owner_map); |
|
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) { |
|
WRITE_ONCE(po->num, num); |
|
register_prot_hook(sk); |
|
} |
|
spin_unlock(&po->bind_lock); |
|
if (pg_vec && (po->tp_version > TPACKET_V2)) { |
|
/* Because we don't support block-based V3 on tx-ring */ |
|
if (!tx_ring) |
|
prb_shutdown_retire_blk_timer(po, rb_queue); |
|
} |
|
|
|
out_free_pg_vec: |
|
bitmap_free(rx_owner_map); |
|
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, |
|
.gettstamp = sock_gettstamp, |
|
.listen = sock_no_listen, |
|
.shutdown = sock_no_shutdown, |
|
.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, |
|
.gettstamp = sock_gettstamp, |
|
.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_printf(seq, |
|
"%*sRefCnt Type Proto Iface R Rmem User Inode\n", |
|
IS_ENABLED(CONFIG_64BIT) ? -17 : -9, "sk"); |
|
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, |
|
refcount_read(&s->sk_refcnt), |
|
s->sk_type, |
|
ntohs(READ_ONCE(po->num)), |
|
READ_ONCE(po->ifindex), |
|
po->running, |
|
atomic_read(&s->sk_rmem_alloc), |
|
from_kuid_munged(seq_user_ns(seq), 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, |
|
}; |
|
#endif |
|
|
|
static int __net_init packet_net_init(struct net *net) |
|
{ |
|
mutex_init(&net->packet.sklist_lock); |
|
INIT_HLIST_HEAD(&net->packet.sklist); |
|
|
|
#ifdef CONFIG_PROC_FS |
|
if (!proc_create_net("packet", 0, net->proc_net, &packet_seq_ops, |
|
sizeof(struct seq_net_private))) |
|
return -ENOMEM; |
|
#endif /* CONFIG_PROC_FS */ |
|
|
|
return 0; |
|
} |
|
|
|
static void __net_exit packet_net_exit(struct net *net) |
|
{ |
|
remove_proc_entry("packet", net->proc_net); |
|
WARN_ON_ONCE(!hlist_empty(&net->packet.sklist)); |
|
} |
|
|
|
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; |
|
|
|
rc = proto_register(&packet_proto, 0); |
|
if (rc) |
|
goto out; |
|
rc = sock_register(&packet_family_ops); |
|
if (rc) |
|
goto out_proto; |
|
rc = register_pernet_subsys(&packet_net_ops); |
|
if (rc) |
|
goto out_sock; |
|
rc = register_netdevice_notifier(&packet_netdev_notifier); |
|
if (rc) |
|
goto out_pernet; |
|
|
|
return 0; |
|
|
|
out_pernet: |
|
unregister_pernet_subsys(&packet_net_ops); |
|
out_sock: |
|
sock_unregister(PF_PACKET); |
|
out_proto: |
|
proto_unregister(&packet_proto); |
|
out: |
|
return rc; |
|
} |
|
|
|
module_init(packet_init); |
|
module_exit(packet_exit); |
|
MODULE_LICENSE("GPL"); |
|
MODULE_ALIAS_NETPROTO(PF_PACKET);
|
|
|