It'll be called a bunch, so worth a bit of effort. Could go further, but not yet.
(really, should hook into wgengine/monitor and only re-read on netlink changes?)
name old time/op new time/op delta
DefaultRouteInterface-8 60.8µs ±11% 44.6µs ± 5% -26.65% (p=0.000 n=20+19)
name old alloc/op new alloc/op delta
DefaultRouteInterface-8 3.29kB ± 0% 0.55kB ± 0% -83.21% (p=0.000 n=20+20)
name old allocs/op new allocs/op delta
DefaultRouteInterface-8 9.00 ± 0% 6.00 ± 0% -33.33% (p=0.000 n=20+20)
We'll use SO_BINDTODEVICE instead of fancy policy routing. This has
some limitations: for example, we will route all traffic through the
interface that has the main "default" (0.0.0.0/0) route, so machines
that have multiple physical interfaces might have to go through DERP to
get to some peers. But machines with multiple physical interfaces are
very likely to have policy routing (ip rule) support anyway.
So far, the only OS I know of that needs this feature is ChromeOS
(crostini). Fixes#245.
Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>
* 'master' of github.com:tailscale/tailscale:
tailcfg: remove unused, unimplemented DERPNode.CertFingerprint for now
net/netns: also don't err on tailscaled -fake as a regular user
net/netcheck: fix HTTPS fallback bug from earlier today
net/netns: don't return an error if we're not root and running the tailscale binary
Otherwise iOS/macOS will reconfigure their routing every time anything
minor changes in the netmap (in particular, endpoints and DERP homes),
which is way too often.
Some users reported "network reconfigured" errors from Chrome when this
happens.
Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>
My earlier 3fa58303d0 tried to implement
the net/http.Tranhsport.DialTLSContext hook, but I didn't return a
*tls.Conn, so we ended up sending a plaintext HTTP request to an HTTPS
port. The response ended up being Go telling as such, not the
/derp/latency-check handler's response (which is currently still a
404). But we didn't even get the 404.
This happened to work well enough because Go's built-in error response
was still a valid HTTP response that we can measure for timing
purposes, but it's not a great answer. Notably, it means we wouldn't
be able to get a future handler to run server-side and count those
latency requests.
tailscale netcheck was broken otherwise.
We can fix this a better way later; I'm just fixing a regression in
some way because I'm trying to work on netcheck at the moment.
This allows tailscaled's own traffic to bypass Tailscale-managed routes,
so that things like tailscale-provided default routes don't break
tailscaled itself.
Progress on #144.
Signed-off-by: David Anderson <danderson@tailscale.com>
We canceled the pingers in Close, but didn't wait around for their
goroutines to be cleaned up. This caused the ipn/e2e_test to catch
pingers in its resource leak check.
This commit introduces an object, but also simplifies the semantics
around the pinger's cancel functions. They no longer need to be called
while holding the mutex.
Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
Also:
* add -verbose flag to cmd/tailscale netcheck
* remove some API from the interfaces package
* convert some of the interfaces package to netaddr.IP
* don't even send IPv4 probes on machines with no IPv4 (or only v4
loopback)
* and once three regions have replied, stop waiting for other probes
at 2x the slowest duration.
Updates #376
Specifically, this sequence:
iptables -N ts-forward
iptables -A ts-forward -m mark --mark 0x10000 -j ACCEPT
iptables -A FORWARD -j ts-forward
doesn't work on Debian-9-using-nftables, but this sequence:
iptables -N ts-forward
iptables -A FORWARD -j ts-forward
iptables -A ts-forward -m mark --mark 0x10000 -j ACCEPT
does work.
I'm sure the reason why is totally fascinating, but it's an old version
of iptables and the bug doesn't seem to exist on modern nftables, so
let's refactor our code to add rules in the always-safe order and
pretend this never happened.
Fixes#401.
Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>
On startup, and when switching into =off and =nodivert, we were
deleting netfilter rules even if we weren't the ones that added them.
In order to avoid interfering with rules added by the sysadmin, we have
to be sure to delete rules only in the case that we added them in the
first place.
Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>
Instead of retrieving the list of chains, or the list of rules in a
chain, just try deleting the ones we don't want and then adding the
ones we do want. An error in flushing/deleting still means the rule
doesn't exist anymore, so there was no need to check for it first.
This avoids the need to parse iptables output, which avoids the need to
ever call iptables -S, which fixes#403, among other things. It's also
much more future proof in case the iptables command line changes.
Unfortunately the iptables go module doesn't properly pass the iptables
command exit code back up when doing .Delete(), so we can't correctly
check the exit code there. (exit code 1 really means the rule didn't
exist, rather than some other weird problem).
Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>
This removes the use of suppress_ifgroup and fwmark "x/y" notation,
which are, among other things, not available in busybox and centos6.
We also use the return codes from the 'ip' program instead of trying to
parse its output.
I also had to remove the previous hack that routed all of 100.64.0.0/10
by default, because that would add the /10 route into the 'main' route
table instead of the new table 88, which is no good. It was a terrible
hack anyway; if we wanted to capture that route, we should have
captured it explicitly as a subnet route, not as part of the addr. Note
however that this change affects all platforms, so hopefully there
won't be any surprises elsewhere.
Fixes#405
Updates #320, #144
Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>
Let's actually list the file we checked
(/proc/sys/net/ipv4/ip_forward). That gives the admin something
specific to look for when they get this message.
Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>
We would print a message about "nothing more to do", which some people
thought was an error or warning. Let's only print a message after
authenticating if we previously asked for interaction, and let's
shorten that message to just "Success," which is what it means.
Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>
