/* * sctp_probe - Observe the SCTP flow with kprobes. * * The idea for this came from Werner Almesberger's umlsim * Copyright (C) 2004, Stephen Hemminger * * Modified for SCTP from Stephen Hemminger's code * Copyright (C) 2010, Wei Yongjun * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * 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 #include #include #include #include #include #include #include #include #include #include #include MODULE_SOFTDEP("pre: sctp"); MODULE_AUTHOR("Wei Yongjun "); MODULE_DESCRIPTION("SCTP snooper"); MODULE_LICENSE("GPL"); static int port __read_mostly = 0; MODULE_PARM_DESC(port, "Port to match (0=all)"); module_param(port, int, 0); static unsigned int fwmark __read_mostly = 0; MODULE_PARM_DESC(fwmark, "skb mark to match (0=no mark)"); module_param(fwmark, uint, 0); static int bufsize __read_mostly = 64 * 1024; MODULE_PARM_DESC(bufsize, "Log buffer size (default 64k)"); module_param(bufsize, int, 0); static int full __read_mostly = 1; MODULE_PARM_DESC(full, "Full log (1=every ack packet received, 0=only cwnd changes)"); module_param(full, int, 0); static const char procname[] = "sctpprobe"; static struct { struct kfifo fifo; spinlock_t lock; wait_queue_head_t wait; struct timespec64 tstart; } sctpw; static __printf(1, 2) void printl(const char *fmt, ...) { va_list args; int len; char tbuf[256]; va_start(args, fmt); len = vscnprintf(tbuf, sizeof(tbuf), fmt, args); va_end(args); kfifo_in_locked(&sctpw.fifo, tbuf, len, &sctpw.lock); wake_up(&sctpw.wait); } static int sctpprobe_open(struct inode *inode, struct file *file) { kfifo_reset(&sctpw.fifo); ktime_get_ts64(&sctpw.tstart); return 0; } static ssize_t sctpprobe_read(struct file *file, char __user *buf, size_t len, loff_t *ppos) { int error = 0, cnt = 0; unsigned char *tbuf; if (!buf) return -EINVAL; if (len == 0) return 0; tbuf = vmalloc(len); if (!tbuf) return -ENOMEM; error = wait_event_interruptible(sctpw.wait, kfifo_len(&sctpw.fifo) != 0); if (error) goto out_free; cnt = kfifo_out_locked(&sctpw.fifo, tbuf, len, &sctpw.lock); error = copy_to_user(buf, tbuf, cnt) ? -EFAULT : 0; out_free: vfree(tbuf); return error ? error : cnt; } static const struct file_operations sctpprobe_fops = { .owner = THIS_MODULE, .open = sctpprobe_open, .read = sctpprobe_read, .llseek = noop_llseek, }; static sctp_disposition_t jsctp_sf_eat_sack(struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const sctp_subtype_t type, void *arg, sctp_cmd_seq_t *commands) { struct sctp_chunk *chunk = arg; struct sk_buff *skb = chunk->skb; struct sctp_transport *sp; static __u32 lcwnd = 0; struct timespec64 now; sp = asoc->peer.primary_path; if (((port == 0 && fwmark == 0) || asoc->peer.port == port || ep->base.bind_addr.port == port || (fwmark > 0 && skb->mark == fwmark)) && (full || sp->cwnd != lcwnd)) { lcwnd = sp->cwnd; ktime_get_ts64(&now); now = timespec64_sub(now, sctpw.tstart); printl("%lu.%06lu ", (unsigned long) now.tv_sec, (unsigned long) now.tv_nsec / NSEC_PER_USEC); printl("%p %5d %5d %5d %8d %5d ", asoc, ep->base.bind_addr.port, asoc->peer.port, asoc->pathmtu, asoc->peer.rwnd, asoc->unack_data); list_for_each_entry(sp, &asoc->peer.transport_addr_list, transports) { if (sp == asoc->peer.primary_path) printl("*"); printl("%pISc %2u %8u %8u %8u %8u %8u ", &sp->ipaddr, sp->state, sp->cwnd, sp->ssthresh, sp->flight_size, sp->partial_bytes_acked, sp->pathmtu); } printl("\n"); } jprobe_return(); return 0; } static struct jprobe sctp_recv_probe = { .kp = { .symbol_name = "sctp_sf_eat_sack_6_2", }, .entry = jsctp_sf_eat_sack, }; static __init int sctp_setup_jprobe(void) { int ret = register_jprobe(&sctp_recv_probe); if (ret) { if (request_module("sctp")) goto out; ret = register_jprobe(&sctp_recv_probe); } out: return ret; } static __init int sctpprobe_init(void) { int ret = -ENOMEM; /* Warning: if the function signature of sctp_sf_eat_sack_6_2, * has been changed, you also have to change the signature of * jsctp_sf_eat_sack, otherwise you end up right here! */ BUILD_BUG_ON(__same_type(sctp_sf_eat_sack_6_2, jsctp_sf_eat_sack) == 0); init_waitqueue_head(&sctpw.wait); spin_lock_init(&sctpw.lock); if (kfifo_alloc(&sctpw.fifo, bufsize, GFP_KERNEL)) return ret; if (!proc_create(procname, S_IRUSR, init_net.proc_net, &sctpprobe_fops)) goto free_kfifo; ret = sctp_setup_jprobe(); if (ret) goto remove_proc; pr_info("probe registered (port=%d/fwmark=%u) bufsize=%u\n", port, fwmark, bufsize); return 0; remove_proc: remove_proc_entry(procname, init_net.proc_net); free_kfifo: kfifo_free(&sctpw.fifo); return ret; } static __exit void sctpprobe_exit(void) { kfifo_free(&sctpw.fifo); remove_proc_entry(procname, init_net.proc_net); unregister_jprobe(&sctp_recv_probe); } module_init(sctpprobe_init); module_exit(sctpprobe_exit); _tunnel_infoNikolay Aleksandrov1-4/+4 2017-02-07net: bridge: remove redundant check to see if err is setColin Ian King1-3/+0 2017-02-06bridge: fdb: write to used and updated at most once per jiffyNikolay Aleksandrov2-2/+4 2017-02-06bridge: move write-heavy fdb members in their own cache lineNikolay Aleksandrov1-4/+6 2017-02-06bridge: move to workqueue gcNikolay Aleksandrov10-23/+29 2017-02-06bridge: modify bridge and port to have often accessed fields in one cache lineNikolay Aleksandrov1-23/+20 2017-02-06net: remove ndo_neigh_{construct, destroy} from stacked devicesIdo Schimmel1-2/+0 2017-02-03Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-nextDavid S. Miller3-32/+49 2017-02-03bridge: vlan dst_metadata hooks in ingress and egress pathsRoopa Prabhu6-2/+82 2017-02-03bridge: per vlan dst_metadata netlink supportRoopa Prabhu7-48/+641 2017-02-02netfilter: allow logging from non-init namespacesMichal Kubeček1-1/+1