Allow triton_context_wakeup() to run before triton_context_schedule().
When that happens, triton_context_schedule() now lets the context
running instead of putting it in sleep mode.

Note that, even though triton now allows triton_context_wakeup() to
happen before triton_context_schedule(), these two functions still need
to be paired and not nested. That is, in a sequence like the following,

triton_context_wakeup()
triton_context_wakeup()
triton_context_schedule()
triton_context_schedule()

the second triton_context_schedule() would put the context in sleep
mode. No matter how many triton_context_wakeup() have been called, the
first triton_context_schedule() "consumes" them all.

Being immune to schedule/wakeup inversion allows to fix the pppd_compat
module. This module needs to fork() to execute external programs. The
parent then waits for completion of its child using
triton_context_schedule(). When child terminates, the sigchld module
runs a callback that has to call triton_context_wakeup() to resume
execution of the parent.

The problem is that there is no synchronisation between the parent and
its child. When under stress, the child may execute faster than its
parent and the sigchld callback might run triton_context_wakeup()
before the parent had time to call triton_context_schedule().

Then accel-ppp might crash because the triton thread might have reset
ctx->thread to NULL, making triton_context_wakeup() write to invalid
memory when trying to insert the context in ctx->thread->wakeup_list[].

Synchronising the parent and its child completion's callback would
require cooperation from triton_context_schedule(). Otherwise we would
still have a time frame between the moment we let the callback waking
up the context and the moment we put the context in sleep mode.
Allowing schedule/wakeup call inversion in triton looks simpler since
it avoids modifying the current API.
Signed-off-by: NGuillaume Nault <g.nault@alphalink.fr>

sstp: fix build w/o openssl & with 1.1.0-1.1.0g

list.h is an accel-ppp internal file.
Signed-off-by: NGuillaume Nault <g.nault@alphalink.fr>

We need to include <stdint.h> to define 'uint16_t'.
Signed-off-by: NGuillaume Nault <g.nault@alphalink.fr>

If MEMDEBUG is defined, then we need to include "memdebug.h" to define
'md_free'.
Signed-off-by: NGuillaume Nault <g.nault@alphalink.fr>

We need to include "list.h" to define 'struct list_head' and
<netinet/in.h> for 'in_addr_t' and 'struct in6_addr'.

Also, let's include "ap_session.h" so that we don't need a forward
declaration for 'struct ap_session'.
Signed-off-by: NGuillaume Nault <g.nault@alphalink.fr>

We need to include <stdint.h> to define 'uint16_t' and "triton.h" for
'struct triton_timer_t'.

Also, let's include "ppp.h" so that we don't need a forward declaration
for 'struct ppp_t'.
Signed-off-by: NGuillaume Nault <g.nault@alphalink.fr>

We need to include <stdint.h> to define 'uint8_t' and "ppp.h" for
'struct ppp_t'.
Signed-off-by: NGuillaume Nault <g.nault@alphalink.fr>

We need to include "ppp.h" to define 'struct ppp_layer_data_t' and
'struct ppp_handler_t'.
Signed-off-by: NGuillaume Nault <g.nault@alphalink.fr>

We need to include <stdio.h> to define 'asprintf', <stdlib.h> for
'malloc', 'realloc' and 'free' and <string.h> for 'strdup' and
'strndup'.
Signed-off-by: NGuillaume Nault <g.nault@alphalink.fr>

We need to include "ap_session.h" to define 'struct ap_session'.
Signed-off-by: NGuillaume Nault <g.nault@alphalink.fr>

We need to include <sys/types.h> to define 'pid_t'.
Signed-off-by: NGuillaume Nault <g.nault@alphalink.fr>

We need to include <netinet/in.h> to define 'in_addr_t'.
Signed-off-by: NGuillaume Nault <g.nault@alphalink.fr>

We need to include <stdint.h> to define 'uint32_t' and <netinet/in.h>
for 'in_addr_t' and 'struct in6_addr'.
Signed-off-by: NGuillaume Nault <g.nault@alphalink.fr>

We need to include <sys/socket.h> to define 'socklen_t', <sys/types.h>
for 'ssize_t' and "list.h" for 'struct list_head'.

Also, let's include "libnetlink.h" so that we don't need a forward
declaration for 'struct rtnl_handle'.
Signed-off-by: NGuillaume Nault <g.nault@alphalink.fr>

We need to include <stdint.h> to define 'uint*_t' and <string.h> for
'memcpy'.
Signed-off-by: NGuillaume Nault <g.nault@alphalink.fr>

We need to include <sys/types.h> to define 'size_t'.

Also, let's include "ap_session.h" so that we don't need a forward
declaration for 'struct ap_session'.
Signed-off-by: NGuillaume Nault <g.nault@alphalink.fr>

We need to include <netinet/in.h> to define 'struct in6_addr' and
<stdint.h> for 'uint8_t'.
Signed-off-by: NGuillaume Nault <g.nault@alphalink.fr>

fix gateway address setup fail due memory corruption

sstp updates

log:
 libnetlink: RTNETLINK answers: Invalid argument
 ppp0: f7bb00a79ef667d2: failed to set IPv4 address: Invalid argument

ipaddr_add_peer() called only with mask equeal 0 or 32, but w/o
zero-allocated structs it contans garbage in some cases.
so, instead ipaddr_add() was called with wrong mask value.
also, init chap-secrets mask for the same reason.

Define a new column, called "netns", that prints the network namespace
in which sessions are set.
Signed-off-by: NGuillaume Nault <g.nault@alphalink.fr>

Several modules assume that if ses->ipv6 is set, then
ses->ipv6->addr_list contains at least one element. But this is not
true if ipv6 was allocated by the pseudo ipdb backend of ipv6cp
(ipv6cp_opt_intfid.c). That is, if the PPP session only has an
automatic link-local address.

This leads modules like pppd-compat and dhcpv6 to access invalid memory
when trying to retrieve the IPv6 address of a PPP session.
Signed-off-by: NGuillaume Nault <g.nault@alphalink.fr>

Missing tab was misleading.
Signed-off-by: NGuillaume Nault <g.nault@alphalink.fr>

If the PPP device is set up into a specific network namespace, all the
configuration that goes with it belongs to this same netns. Therefore,
we need to run the up/down scripts in that namespace too.
Signed-off-by: NGuillaume Nault <g.nault@alphalink.fr>

The first argument passed to the ip-pre-up script, was mistakenly set
to the value of ip-up.
Signed-off-by: NGuillaume Nault <g.nault@alphalink.fr>

sstp: add ECDSA certs support and DH/ECDH config options

sstp: fix station_ids, add stat/snmp support & full crypto binding validation