diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2018-01-31 14:31:10 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-01-31 14:31:10 -0800 |
commit | b2fe5fa68642860e7de76167c3111623aa0d5de1 (patch) | |
tree | b7f9b89b7039ecefbc35fe3c8e73a6ff972641dd /net/ipv4/tcp_probe.c | |
parent | a103950e0dd2058df5e8a8d4a915707bdcf205f0 (diff) | |
parent | a54667f6728c2714a400f3c884727da74b6d1717 (diff) | |
download | op-kernel-dev-b2fe5fa68642860e7de76167c3111623aa0d5de1.zip op-kernel-dev-b2fe5fa68642860e7de76167c3111623aa0d5de1.tar.gz |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next
Pull networking updates from David Miller:
1) Significantly shrink the core networking routing structures. Result
of http://vger.kernel.org/~davem/seoul2017_netdev_keynote.pdf
2) Add netdevsim driver for testing various offloads, from Jakub
Kicinski.
3) Support cross-chip FDB operations in DSA, from Vivien Didelot.
4) Add a 2nd listener hash table for TCP, similar to what was done for
UDP. From Martin KaFai Lau.
5) Add eBPF based queue selection to tun, from Jason Wang.
6) Lockless qdisc support, from John Fastabend.
7) SCTP stream interleave support, from Xin Long.
8) Smoother TCP receive autotuning, from Eric Dumazet.
9) Lots of erspan tunneling enhancements, from William Tu.
10) Add true function call support to BPF, from Alexei Starovoitov.
11) Add explicit support for GRO HW offloading, from Michael Chan.
12) Support extack generation in more netlink subsystems. From Alexander
Aring, Quentin Monnet, and Jakub Kicinski.
13) Add 1000BaseX, flow control, and EEE support to mvneta driver. From
Russell King.
14) Add flow table abstraction to netfilter, from Pablo Neira Ayuso.
15) Many improvements and simplifications to the NFP driver bpf JIT,
from Jakub Kicinski.
16) Support for ipv6 non-equal cost multipath routing, from Ido
Schimmel.
17) Add resource abstration to devlink, from Arkadi Sharshevsky.
18) Packet scheduler classifier shared filter block support, from Jiri
Pirko.
19) Avoid locking in act_csum, from Davide Caratti.
20) devinet_ioctl() simplifications from Al viro.
21) More TCP bpf improvements from Lawrence Brakmo.
22) Add support for onlink ipv6 route flag, similar to ipv4, from David
Ahern.
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1925 commits)
tls: Add support for encryption using async offload accelerator
ip6mr: fix stale iterator
net/sched: kconfig: Remove blank help texts
openvswitch: meter: Use 64-bit arithmetic instead of 32-bit
tcp_nv: fix potential integer overflow in tcpnv_acked
r8169: fix RTL8168EP take too long to complete driver initialization.
qmi_wwan: Add support for Quectel EP06
rtnetlink: enable IFLA_IF_NETNSID for RTM_NEWLINK
ipmr: Fix ptrdiff_t print formatting
ibmvnic: Wait for device response when changing MAC
qlcnic: fix deadlock bug
tcp: release sk_frag.page in tcp_disconnect
ipv4: Get the address of interface correctly.
net_sched: gen_estimator: fix lockdep splat
net: macb: Handle HRESP error
net/mlx5e: IPoIB, Fix copy-paste bug in flow steering refactoring
ipv6: addrconf: break critical section in addrconf_verify_rtnl()
ipv6: change route cache aging logic
i40e/i40evf: Update DESC_NEEDED value to reflect larger value
bnxt_en: cleanup DIM work on device shutdown
...
Diffstat (limited to 'net/ipv4/tcp_probe.c')
-rw-r--r-- | net/ipv4/tcp_probe.c | 301 |
1 files changed, 0 insertions, 301 deletions
diff --git a/net/ipv4/tcp_probe.c b/net/ipv4/tcp_probe.c deleted file mode 100644 index 697f4c6..0000000 --- a/net/ipv4/tcp_probe.c +++ /dev/null @@ -1,301 +0,0 @@ -/* - * tcpprobe - Observe the TCP flow with kprobes. - * - * The idea for this came from Werner Almesberger's umlsim - * Copyright (C) 2004, Stephen Hemminger <shemminger@osdl.org> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - */ - -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt - -#include <linux/kernel.h> -#include <linux/kprobes.h> -#include <linux/socket.h> -#include <linux/tcp.h> -#include <linux/slab.h> -#include <linux/proc_fs.h> -#include <linux/module.h> -#include <linux/ktime.h> -#include <linux/time.h> -#include <net/net_namespace.h> - -#include <net/tcp.h> - -MODULE_AUTHOR("Stephen Hemminger <shemminger@linux-foundation.org>"); -MODULE_DESCRIPTION("TCP cwnd snooper"); -MODULE_LICENSE("GPL"); -MODULE_VERSION("1.1"); - -static int port __read_mostly; -MODULE_PARM_DESC(port, "Port to match (0=all)"); -module_param(port, int, 0); - -static unsigned int bufsize __read_mostly = 4096; -MODULE_PARM_DESC(bufsize, "Log buffer size in packets (4096)"); -module_param(bufsize, uint, 0); - -static unsigned int fwmark __read_mostly; -MODULE_PARM_DESC(fwmark, "skb mark to match (0=no mark)"); -module_param(fwmark, uint, 0); - -static int full __read_mostly; -MODULE_PARM_DESC(full, "Full log (1=every ack packet received, 0=only cwnd changes)"); -module_param(full, int, 0); - -static const char procname[] = "tcpprobe"; - -struct tcp_log { - ktime_t tstamp; - union { - struct sockaddr raw; - struct sockaddr_in v4; - struct sockaddr_in6 v6; - } src, dst; - u16 length; - u32 snd_nxt; - u32 snd_una; - u32 snd_wnd; - u32 rcv_wnd; - u32 snd_cwnd; - u32 ssthresh; - u32 srtt; -}; - -static struct { - spinlock_t lock; - wait_queue_head_t wait; - ktime_t start; - u32 lastcwnd; - - unsigned long head, tail; - struct tcp_log *log; -} tcp_probe; - -static inline int tcp_probe_used(void) -{ - return (tcp_probe.head - tcp_probe.tail) & (bufsize - 1); -} - -static inline int tcp_probe_avail(void) -{ - return bufsize - tcp_probe_used() - 1; -} - -#define tcp_probe_copy_fl_to_si4(inet, si4, mem) \ - do { \ - si4.sin_family = AF_INET; \ - si4.sin_port = inet->inet_##mem##port; \ - si4.sin_addr.s_addr = inet->inet_##mem##addr; \ - } while (0) \ - -/* - * Hook inserted to be called before each receive packet. - * Note: arguments must match tcp_rcv_established()! - */ -static void jtcp_rcv_established(struct sock *sk, struct sk_buff *skb, - const struct tcphdr *th) -{ - unsigned int len = skb->len; - const struct tcp_sock *tp = tcp_sk(sk); - const struct inet_sock *inet = inet_sk(sk); - - /* Only update if port or skb mark matches */ - if (((port == 0 && fwmark == 0) || - ntohs(inet->inet_dport) == port || - ntohs(inet->inet_sport) == port || - (fwmark > 0 && skb->mark == fwmark)) && - (full || tp->snd_cwnd != tcp_probe.lastcwnd)) { - - spin_lock(&tcp_probe.lock); - /* If log fills, just silently drop */ - if (tcp_probe_avail() > 1) { - struct tcp_log *p = tcp_probe.log + tcp_probe.head; - - p->tstamp = ktime_get(); - switch (sk->sk_family) { - case AF_INET: - tcp_probe_copy_fl_to_si4(inet, p->src.v4, s); - tcp_probe_copy_fl_to_si4(inet, p->dst.v4, d); - break; - case AF_INET6: - memset(&p->src.v6, 0, sizeof(p->src.v6)); - memset(&p->dst.v6, 0, sizeof(p->dst.v6)); -#if IS_ENABLED(CONFIG_IPV6) - p->src.v6.sin6_family = AF_INET6; - p->src.v6.sin6_port = inet->inet_sport; - p->src.v6.sin6_addr = inet6_sk(sk)->saddr; - - p->dst.v6.sin6_family = AF_INET6; - p->dst.v6.sin6_port = inet->inet_dport; - p->dst.v6.sin6_addr = sk->sk_v6_daddr; -#endif - break; - default: - BUG(); - } - - p->length = len; - p->snd_nxt = tp->snd_nxt; - p->snd_una = tp->snd_una; - p->snd_cwnd = tp->snd_cwnd; - p->snd_wnd = tp->snd_wnd; - p->rcv_wnd = tp->rcv_wnd; - p->ssthresh = tcp_current_ssthresh(sk); - p->srtt = tp->srtt_us >> 3; - - tcp_probe.head = (tcp_probe.head + 1) & (bufsize - 1); - } - tcp_probe.lastcwnd = tp->snd_cwnd; - spin_unlock(&tcp_probe.lock); - - wake_up(&tcp_probe.wait); - } - - jprobe_return(); -} - -static struct jprobe tcp_jprobe = { - .kp = { - .symbol_name = "tcp_rcv_established", - }, - .entry = jtcp_rcv_established, -}; - -static int tcpprobe_open(struct inode *inode, struct file *file) -{ - /* Reset (empty) log */ - spin_lock_bh(&tcp_probe.lock); - tcp_probe.head = tcp_probe.tail = 0; - tcp_probe.start = ktime_get(); - spin_unlock_bh(&tcp_probe.lock); - - return 0; -} - -static int tcpprobe_sprint(char *tbuf, int n) -{ - const struct tcp_log *p - = tcp_probe.log + tcp_probe.tail; - struct timespec64 ts - = ktime_to_timespec64(ktime_sub(p->tstamp, tcp_probe.start)); - - return scnprintf(tbuf, n, - "%lu.%09lu %pISpc %pISpc %d %#x %#x %u %u %u %u %u\n", - (unsigned long)ts.tv_sec, - (unsigned long)ts.tv_nsec, - &p->src, &p->dst, p->length, p->snd_nxt, p->snd_una, - p->snd_cwnd, p->ssthresh, p->snd_wnd, p->srtt, p->rcv_wnd); -} - -static ssize_t tcpprobe_read(struct file *file, char __user *buf, - size_t len, loff_t *ppos) -{ - int error = 0; - size_t cnt = 0; - - if (!buf) - return -EINVAL; - - while (cnt < len) { - char tbuf[256]; - int width; - - /* Wait for data in buffer */ - error = wait_event_interruptible(tcp_probe.wait, - tcp_probe_used() > 0); - if (error) - break; - - spin_lock_bh(&tcp_probe.lock); - if (tcp_probe.head == tcp_probe.tail) { - /* multiple readers race? */ - spin_unlock_bh(&tcp_probe.lock); - continue; - } - - width = tcpprobe_sprint(tbuf, sizeof(tbuf)); - - if (cnt + width < len) - tcp_probe.tail = (tcp_probe.tail + 1) & (bufsize - 1); - - spin_unlock_bh(&tcp_probe.lock); - - /* if record greater than space available - return partial buffer (so far) */ - if (cnt + width >= len) - break; - - if (copy_to_user(buf + cnt, tbuf, width)) - return -EFAULT; - cnt += width; - } - - return cnt == 0 ? error : cnt; -} - -static const struct file_operations tcpprobe_fops = { - .owner = THIS_MODULE, - .open = tcpprobe_open, - .read = tcpprobe_read, - .llseek = noop_llseek, -}; - -static __init int tcpprobe_init(void) -{ - int ret = -ENOMEM; - - /* Warning: if the function signature of tcp_rcv_established, - * has been changed, you also have to change the signature of - * jtcp_rcv_established, otherwise you end up right here! - */ - BUILD_BUG_ON(__same_type(tcp_rcv_established, - jtcp_rcv_established) == 0); - - init_waitqueue_head(&tcp_probe.wait); - spin_lock_init(&tcp_probe.lock); - - if (bufsize == 0) - return -EINVAL; - - bufsize = roundup_pow_of_two(bufsize); - tcp_probe.log = kcalloc(bufsize, sizeof(struct tcp_log), GFP_KERNEL); - if (!tcp_probe.log) - goto err0; - - if (!proc_create(procname, S_IRUSR, init_net.proc_net, &tcpprobe_fops)) - goto err0; - - ret = register_jprobe(&tcp_jprobe); - if (ret) - goto err1; - - pr_info("probe registered (port=%d/fwmark=%u) bufsize=%u\n", - port, fwmark, bufsize); - return 0; - err1: - remove_proc_entry(procname, init_net.proc_net); - err0: - kfree(tcp_probe.log); - return ret; -} -module_init(tcpprobe_init); - -static __exit void tcpprobe_exit(void) -{ - remove_proc_entry(procname, init_net.proc_net); - unregister_jprobe(&tcp_jprobe); - kfree(tcp_probe.log); -} -module_exit(tcpprobe_exit); |