libkvm digging in kernel memory. This is possible since r231506 made
getifaddrs(3) to supply if_data for each ifaddr.
The pros of this change is that now netstat(1) doesn't know about kernel
struct ifnet and struct ifaddr. And these structs are about to change
significantly in head soon. New netstat binary will work well with 10.0
and any future kernel.
The cons is that now it isn't possible to obtain interface statistics
from a vmcore.
Functions intpr() and sidewaysintpr() were rewritten from scratch.
The output of netstat(1) has underwent the following changes:
1) The MTU is not printed for protocol addresses, since it has no notion.
Dash is printed instead. If there would be a strong desire to return
previous output, it is doable.
2) Output interface queue drops are not printed. Currently this data isn't
available to userland via any API. We plan to drop 'struct ifqueue' from
'struct ifnet' very soon, so old kvm(3) access to queue drops is soon
to be broken, too. The plan is that drivers would handle their queues
theirselves and a new field in if_data would be updated in case of drops.
3) In-kernel reference count for multicast addresses isn't printed. I doubt
that anyone used it. Anyway, netstat(1) is sysadmin tool, not kernel
debugger.
Sponsored by: Netflix
Sponsored by: Nginx, Inc.
The index() and rindex() functions were marked LEGACY in the 2001
revision of POSIX and were subsequently removed from the 2008 revision.
The strchr() and strrchr() functions are part of the C standard.
This makes the source code a lot more consistent, as most of these C
files also call into other str*() routines. In fact, about a dozen
already perform strchr() calls.
stack from the output of `netstat -ani'.
- The node-local multicast address in the output of `netstat -rn'
should be handled as well.
Spotted by: Bernd Walter <ticso__at__cicely7.cicely.de>
is in accordance with the information provided at
ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change
Also add $FreeBSD$ to a few files to keep svn happy.
Discussed with: imp, rwatson
general, when support was added to netstat for fetching data using sysctl,
no provision was left for fetching equivalent data from a core dump, and
in fact, netstat would _always_ fetch data from the live kernel using
sysctl even when -M was specified resulting in the user believing they
were getting data from coredumps when they actually weren't. Some specific
changes:
- Add a global 'live' variable that is true if netstat is running against
the live kernel and false if -M has been specified.
- Stop abusing the sysctl flag in the protocol tables to hold the protocol
number. Instead, the protocol is now its own field in the tables, and
it is passed as a separate parameter to the PCB and stat routines rather
than overloading the KVM offset parameter.
- Don't run PCB or stats functions who don't have a namelist offset if we
are being run against a crash dump (!live).
- For the inet and unix PCB routines, we generate the same buffer from KVM
that the sysctl usually generates complete with the header and trailer.
- Don't run bpf stats for !live (before it would just silently always run
live).
- kread() no longer trashes memory when opening the buffer if there is an
error on open and the passed in buffer is smaller than _POSIX2_LINE_MAX.
- The multicast routing code doesn't fallback to kvm on live kernels if
the sysctl fails. Keeping this made the code rather hairy, and netstat
is already tied to the kernel ABI anyway (even when using sysctl's since
things like xinpcb contain an inpcb) so any kernels this is run against
that have the multicast routing stuff should have the sysctls.
- Don't try to dig around in the kernel linker in the netgraph PCB routine
for core dumps.
Other notes:
- sctp's PCB routine only works on live kernels, it looked rather
complicated to generate all the same stuff via KVM. Someone can always
add it later if desired though.
- Fix the ipsec removal bug where N_xxx for IPSEC stats weren't renumbered.
- Use sysctlbyname() everywhere rather than hardcoded mib values.
MFC after: 1 week
Approved by: re (rwatson)
sidewaysintpr(). This increases the accuracy of the per-interval
counts when they are interpreted as rates. Repeated calls to alarm(n)
give an average interval that is about 2 ticks larger than n and has
a large variance. Periodic itimers normally get the average almost
right but have similarly large variance (due to scheduling delays).
Statistics utilities should use clock_gettime() to determine the
actual interval, but it is still useful to maximize the accuracy of
the interval, especially for cases like netstat -w where counts are
displayed so the program cannot hide the inaccuracy in a rate
conversion.
including to printf(). Using uintmax_t is also robust to further
extensions in both the C language and the bitwidth of kernel counters.
Tested on: i386 amd64 ia64
replacement and has additional features which make it superior.
Discussed on: -arch
Reviewed by: thompsa
X-MFC-after: never (RELENG_6 as transition period)
truncated. In environments where many tunnel or vlan interfaces are created,
interface names have high numbers which overflow the field width.
PRs: bin/52349, bin/35838
Submitted by: Mike Tancsa, Scot W. Hetzel
Approved by: re (rwatson)
if_xname, if_dname, and if_dunit. if_xname is the name of the interface
and if_dname/unit are the driver name and instance.
This change paves the way for interface renaming and enhanced pseudo
device creation and configuration symantics.
Approved By: re (in principle)
Reviewed By: njl, imp
Tested On: i386, amd64, sparc64
Obtained From: NetBSD (if_xname)
1) Include arpa/inet.h for ntohs.
2) Constness fixes.
3) Fix shadowing except for "sin" which shouldn't be in scope.
4) Remove register keyword.
5) Add missing initialsers to user defined structs.
5) Make prototype of netname6 globally visable.
6) Use right macros for printing syncache stats (even though entrie isn't
a word).
Removed the ambiguity in -s, -f, -p and -i flags handling.
Basically, there are four displays (except others):
1. PCB display.
2. Protocol statistics display. (-s)
3. Interface statistics display. (-i)
4. Per-interface protocol statistics display. (-i -s)
All of the above except 3) can be limited to a particular
protocol family (-f) or a single protocol (-p).
Some examples:
1. netstat -f inet -- show PCBs of all INET protocols
2. netstat -p udp -- show PCB of UDP protocol only (NEW!)
3. netstat -s -- show protocol statistics for all families
4. netstat -s -f inet -- show INET protocols statistics
5. netstat -s -p icmp -- show ICMP protocol statistics
This is a work in progress. Manpage has been fixed slightly,
but is still incomplete.
