| Age | Commit message (Collapse) | Author |
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Closes #354
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Validate known options before extracting fields, bound Relay-Agent and classless-route subformats, and replace unaligned DHCP option accesses in notification, relay, and session paths.
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Various fixes on compiler warnings
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The netmask was built by shifting ~0, which is a signed int holding -1,
and left shifting a negative value is undefined in C. Every compiler we
build with produces the expected mask, so this is not a behaviour fix,
but it trips -fsanitize=shift and relies on latitude the standard does
not grant. Shift an unsigned operand instead.
The prefix length itself was not validated properly either. strtoul()
accepts a leading minus and negates, so 'local-net=10.0.0.0/-1' yields
ULONG_MAX, which truncates to -1 in the int and passes the 'mask > 32'
test. The shift count then becomes 33, which is out of range whether the
operand is signed or unsigned. endptr was set but never looked at, so
trailing garbage was silently ignored and '/abc' quietly became a /0.
Keep the parsed value unsigned, reject anything that is not a complete
number in 0..32, and only then narrow it.
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The destination was always read as a 32 bit word regardless of how many
significant octets the prefix length implies, and the gateway was read
without checking that four bytes remain in the option. Neither read was
bounded by the end of the option, so a client could make the decoder run
past it. dhcpv4_check_options() only enforces a minimum length of 5 for
option 121, which is short of the 9 bytes a /32 route needs.
Reading the destination as a word was also wrong for any prefix shorter
than /32, as it pulled in the first octets of the gateway: 10.0.1.0/24
via 1.1.1.1 printed as 10.0.0.1/24.
Read only the significant octets, check the remaining length before both
reads, and copy the gateway rather than dereferencing a possibly
unaligned pointer.
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The netmask was built with a loop shifting 1 into place, which was wrong
in three ways. At i == 0 it evaluated 1 << 32, undefined for a 32 bit
int, and at i == 1 it shifted into the sign bit of a signed value. The
shift amount was off by one, so a /24 produced 0xfffffe00 rather than
0xffffff00. And mask1 was initialized once before the loop over the
routes and only ever OR'ed into, so the mask of every route accumulated
into the routes that followed it.
A well formed option carrying 10.0.1.0/24 via 1.1.1.1 and 172.16.0.0/12
via 2.2.2.2 printed as 10.0.0.1/24 and 172.16.2.0/12.
Compute the mask directly instead, and reject a prefix length above 32
rather than shifting by a negative amount.
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On startup accel-pppd is expected to drop everything a previous instance
left behind in the kernel. For sessions it did so by dumping them with
IPOE_CMD_GET and sending one IPOE_CMD_DELETE per ifindex. That dump was
written for the session backup code removed in 1972a7e5c and was never
adapted to its new, destructive role:
- it was issued on the socket subscribed to the packet multicast group,
so it competed with the notifications that the still attached stale
rx handlers keep generating; on a loaded box the receive buffer
overruns and rtnl_dump_filter() gives up with ENOBUFS,
- its return value was discarded, so such a failure was silent,
- it ran before the interfaces were detached, which is what produces
those notifications in the first place,
- it was skipped entirely when the multicast group could not be
resolved, again with nothing but a warning about packet handling,
- and every session cost a socket, a round trip, a grace period and a
full unregister_netdev().
Whatever it missed stays in the kernel forever: the daemon has no record
of those sessions, so nothing ever deletes them, and every subscriber
later assigned one of their addresses is refused with EEXIST by
IPOE_CMD_MODIFY.
Add IPOE_CMD_FLUSH, which unlinks all sessions in one go, waits for a
single grace period and unregisters the devices with
unregister_netdevice_many(), and use it instead. The old path is kept as
a fallback for a module predating the command, which is reported as
EOPNOTSUPP, and now checks its return value and uses a private socket.
Reorder init() so the interfaces are detached before the multicast group
is joined, and so the flush also runs when only the group lookup failed.
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The request buffers are plain stack variables and only the nlmsghdr
fields and genlmsghdr.cmd were ever assigned, so genlmsghdr.version and
genlmsghdr.reserved reached the kernel holding whatever happened to be
on the stack.
Since 6.1 genetlink validates the reserved header fields of every
command whose id is >= genl_family.resv_start_op, and ipoe sets that
field to CTRL_CMD_GETPOLICY + 1, i.e. 11. IPOE_CMD_DEL_NET is 11, so
ipoe_nl_del_net(), which runs on startup and on every config reload, is
already rejected with EINVAL whenever that garbage is nonzero, and any
command added after it is affected as well.
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The ipoe-level ses->username always holds an allocated string
(_strdup of ifname/calling-station-id, u_inet_ntoa buffer or lua
result), but ipoe_session_free() never released it. Ownership is
normally transferred in auth_result() via ap_session_set_username(),
so the string was leaked whenever a session died before auth_result()
ran: termination while starting, PWDB_WAIT never completing, or
ipoe_create_interface() failure.
The create-interface failure path also leaked the freshly allocated
local copy outright, since it returned before the string was stored
anywhere.
Store the string in ses->username as soon as it is obtained and free
it in ipoe_session_free(). auth_result() clears ses->username before
handing ownership to ap_session_set_username(), so no double free is
possible.
Reported-by: Louis Scalbert (#101)
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dhcpv4_relay_read() takes a reference on the reply packet for every
registered listener context and hands it over via triton_context_call().
The receiving ipoe_ses_recv_dhcpv4_relay() consumes that reference by
storing the packet in ses->dhcpv4_relay_reply, but the early-return
branch taken when the original request is already gone dropped the
reference without freeing the packet.
This leaks one packet every time a relay reply races with the request
being released, which happens regularly on busy relay-mode deployments.
Reported-by: Louis Scalbert (#101)
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strip() memmove count was one short, dropping the NULL terminator;
dpado_parse error path leaked already-parsed range entries.
Also affects ipoe.
Since strip is identical in both, we can place fixed common function in utils.
Reported-by: Khedor <khedor@gmail.com>
Signed-off-by: Denys Fedoryshchenko <denys.f@collabora.com>
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Group the core session starting, active, and finishing statistics behind the private ap_session_stat storage in session.c instead of exposing writable counters through ap_session.h. This keeps ownership inside the session core while preserving the existing CLI and ACCEL-PPP-MIB counter semantics.
Route session counter updates through ap_session_stat_*() helpers. Session start, activation, termination, finish, and shutdown-idle paths no longer open-code individual counter increments/decrements; the update policy now lives beside the session-owned storage and uses relaxed atomic operations for the simple state counters.
Make the CLI show-stat path render from a local snapshot and convert the PPP SNMP starting/active/finishing scalars from watched raw pointers to scalar handlers. PPP controllers now read max-session limits through ap_session_stat_starting() and ap_session_stat_active(), removing external direct access to ap_session_stat.
Signed-off-by: Denys Fedoryshchenko <denys.f@collabora.com>
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Group the IPOE starting, active, and delayed offer statistics in struct ipoe_stat_t and keep the storage private to ipoe.c instead of exposing writable stat_* globals. This keeps ownership inside the IPOE control code while preserving the existing CLI and ACCEL-PPP-MIB counter semantics.
Route counter updates through ipoe_stat_*() helpers. Session setup, activation, teardown, and delayed offer queue paths no longer open-code individual counter increments/decrements; the update policy now lives beside the IPOE-owned storage and uses relaxed atomic operations for the simple state counters.
Make the CLI show-stat path render from a local snapshot and convert the IPOE SNMP starting/active scalars from watched raw pointers to scalar handlers. SNMP now reads through ipoe_stat_starting() and ipoe_stat_active(), removing the old ipoe_get_stat() pointer escape hatch.
Signed-off-by: Denys Fedoryshchenko <denys.f@collabora.com>
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Replaced Linux-specific headers with their net counterparts.
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Replaced conditional inclusion of if_arp.h and if_packet.h with direct includes.
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Added VRF support to the iproute routines.
Updated iproute* calls in the ipoe, radius, and dhcpv6 code.
Signed-off-by: Andrii Melnychenko <a.melnychenko@vyos.io>
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Allowed using multiple NTP servers in DHCP option 42
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migrate from pcre to pcre2
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PCRE is not supported anymore and removed from several distros
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This patch fixes compile errors on GCC 14 like the following
/root/accel-ppp/accel-pppd/radius/packet.c: In function 'rad_packet_recv':
/root/accel-ppp/accel-pppd/radius/packet.c:142:72: error: passing argument 5 of 'recvfrom' from incompatible pointer type [-Wincompatible-pointer-types]
142 | n = recvfrom(fd, pack->buf, REQ_LENGTH_MAX, 0, addr, &addr_len);
| ^~~~
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| struct sockaddr_in *
In file included from /usr/include/netinet/in.h:10,
from /usr/include/arpa/inet.h:9,
from /root/accel-ppp/accel-pppd/radius/packet.c:10:
/usr/include/sys/socket.h:397:55: note: expected 'struct sockaddr * restrict' but argument is of type 'struct sockaddr_in *'
Reference: https://gcc.gnu.org/gcc-14/porting_to.html
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Thanks for hints Alpine Linux project and their patches:
https://git.alpinelinux.org/aports/tree/community/accel-ppp?h=master
We can adjust a bit code and cmake config files to make accel-ppp
buildable under musl "as is".
Signed-off-by: Denys Fedoryshchenko <denys.f@collabora.com>
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ipoe: check localnet only for start=UP (unclassified packets) sessions
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Co-authored-by: Peter Adam <p.adam@cygnusnetworks.de>
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Link-selection pointer is not set to NULL when link-selection IPOE
option is not set. It results in a memory access violation in
dhcpv4_packet_insert_opt82()
Set link-selection pointer to NULL if unset to fix the issue.
Fixes: 61e31c591e ("ipoe: add dhcp link selection sub-option")
Signed-off-by: Louis Scalbert <louis.scalbert@6wind.com>
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Add the support of DHCP option 82 "Agent Information" sub-option 5
"link selection". The IPv4 value can be specified in the [ipoe]
"link-selection" configuration option.
Link: https://www.rfc-editor.org/rfc/rfc3527.html
Signed-off-by: Philippe Guibert <philippe.guibert@6wind.com>
Signed-off-by: Louis Scalbert <louis.scalbert@6wind.com>
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T72: Fix compilations warnings for unaligned variable access
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- IPoE/DHCP4: Specify minimal suitable alignment explicitly.
We need to guarantee 2 byte alignment for the `hdr` pointer in
`ip_csum(uint16_t *buf)` calculation
- PPPOE: Suppress false-positive warning for `sockaddr_pppox`.
Similiar issue: https://github.com/kernelslacker/trinity/pull/40
- Introduce tmp variables to avoid alignment issues for SSTP/DHCPv6
For additional details:
https://phabricator.accel-ppp.org/T72
Signed-off-by: Volodymyr Huti <v.huti@vyos.io>
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proxy_arp=2 should be used for ipoe setup with shared vlan and intra-vlan l2 isolation. accel-ppp should use server mac when sending arp reply message. There is no reason to send subscriber's mac if proxy_arp is enabled
In case of ipoe shared vlan without l2-isolation, proxy_arp=1 should be used
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fixes a1a2b79240511222868a60960d51f12adbe0d7d4
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dhcp request header
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* Fix errors found by valgrind
==12312== Syscall param sendmsg(msg.msg_iov[0]) points to uninitialised byte(s)
==12312== at 0x486CCF0: sendmsg (in /lib/libpthread-2.22.so)
==12312== by 0x12F57F: rtnl_talk (libnetlink.c:316)
==12312== by 0x132DA3: genl_resolve_mcg (genl.c:52)
==12312== by 0x484E1CB: init (vlan_mon.c:528)
==12312== by 0x484CDC0: vlan_mon_register_proto (vlan_mon.c:48)
==12312== by 0x510B763: load_vlan_mon (pppoe.c:1914)
==12312== by 0x510BFF2: load_config (pppoe.c:2064)
==12312== by 0x510C22A: pppoe_init (pppoe.c:2108)
==12312== by 0x483E9EB: triton_load_modules (triton.c:704)
==12312== by 0x1384B2: main (main.c:339)
==12312== Address 0xbedacdd8 is on thread 1's stack
==12312== in frame #2, created by genl_resolve_mcg (genl.c:23)
==12312== 15 bytes in 1 blocks are definitely lost in loss record 352 of 836
==12312== at 0x482A9A9: malloc (in /usr/lib/valgrind/vgpreload_memcheck-x86-linux.so)
==12312== by 0x4B97524: strdup (in /lib/libc-2.22.so)
==12312== by 0x12C30C: init (telnet.c:769)
==12312== by 0x483E9EB: triton_load_modules (triton.c:704)
==12312== by 0x1384B2: main (main.c:339)
==12312==
==12312== 15 bytes in 1 blocks are definitely lost in loss record 353 of 836
==12312== at 0x482A9A9: malloc (in /usr/lib/valgrind/vgpreload_memcheck-x86-linux.so)
==12312== by 0x4B97524: strdup (in /lib/libc-2.22.so)
==12312== by 0x12D60A: init (tcp.c:392)
==12312== by 0x483E9EB: triton_load_modules (triton.c:704)
==12312== by 0x1384B2: main (main.c:339)
* Fix another warnings by cppcheck
[accel-pppd/ctrl/ipoe/arp.c:256]: (error) Uninitialized variable: n
[accel-pppd/ctrl/pppoe/mac_filter.c:90]: (warning) %x in format string (no. 1) requires 'unsigned int *' but the argument type is 'signed int *'.
[accel-pppd/ctrl/pppoe/mac_filter.c:90]: (warning) %x in format string (no. 2) requires 'unsigned int *' but the argument type is 'signed int *'.
[accel-pppd/ctrl/pppoe/mac_filter.c:90]: (warning) %x in format string (no. 3) requires 'unsigned int *' but the argument type is 'signed int *'.
[accel-pppd/ctrl/pppoe/mac_filter.c:90]: (warning) %x in format string (no. 4) requires 'unsigned int *' but the argument type is 'signed int *'.
[accel-pppd/ctrl/pppoe/mac_filter.c:90]: (warning) %x in format string (no. 5) requires 'unsigned int *' but the argument type is 'signed int *'.
[accel-pppd/ctrl/pppoe/mac_filter.c:90]: (warning) %x in format string (no. 6) requires 'unsigned int *' but the argument type is 'signed int *'.
[accel-pppd/ctrl/pppoe/mac_filter.c:129]: (warning) %x in format string (no. 1) requires 'unsigned int *' but the argument type is 'signed int *'.
[accel-pppd/ctrl/pppoe/mac_filter.c:129]: (warning) %x in format string (no. 2) requires 'unsigned int *' but the argument type is 'signed int *'.
[accel-pppd/ctrl/pppoe/mac_filter.c:129]: (warning) %x in format string (no. 3) requires 'unsigned int *' but the argument type is 'signed int *'.
[accel-pppd/ctrl/pppoe/mac_filter.c:129]: (warning) %x in format string (no. 4) requires 'unsigned int *' but the argument type is 'signed int *'.
[accel-pppd/ctrl/pppoe/mac_filter.c:129]: (warning) %x in format string (no. 5) requires 'unsigned int *' but the argument type is 'signed int *'.
[accel-pppd/ctrl/pppoe/mac_filter.c:129]: (warning) %x in format string (no. 6) requires 'unsigned int *' but the argument type is 'signed int *'.
[accel-pppd/ctrl/pppoe/mac_filter.c:158]: (warning) %x in format string (no. 1) requires 'unsigned int *' but the argument type is 'signed int *'.
[accel-pppd/ctrl/pppoe/mac_filter.c:158]: (warning) %x in format string (no. 2) requires 'unsigned int *' but the argument type is 'signed int *'.
[accel-pppd/ctrl/pppoe/mac_filter.c:158]: (warning) %x in format string (no. 3) requires 'unsigned int *' but the argument type is 'signed int *'.
[accel-pppd/ctrl/pppoe/mac_filter.c:158]: (warning) %x in format string (no. 4) requires 'unsigned int *' but the argument type is 'signed int *'.
[accel-pppd/ctrl/pppoe/mac_filter.c:158]: (warning) %x in format string (no. 5) requires 'unsigned int *' but the argument type is 'signed int *'.
[accel-pppd/ctrl/pppoe/mac_filter.c:158]: (warning) %x in format string (no. 6) requires 'unsigned int *' but the argument type is 'signed int *'.
[accel-pppd/ctrl/pppoe/pppoe.c:738]: (warning) Possible null pointer dereference
[accel-pppd/ipv6/dhcpv6.c:911]: (warning) %x in format string (no. 1) requires 'unsigned int *' but the argument type is 'int *'.
[accel-pppd/ipv6/dhcpv6.c:911]: (warning) %x in format string (no. 2) requires 'unsigned int *' but the argument type is 'signed int *'.
[accel-pppd/ipv6/dhcpv6.c:911]: (warning) %x in format string (no. 3) requires 'unsigned int *' but the argument type is 'signed int *'.
[accel-pppd/ipv6/dhcpv6.c:911]: (warning) %x in format string (no. 4) requires 'unsigned int *' but the argument type is 'signed int *'.
[accel-pppd/libnetlink/libnetlink.c:515]: (warning) Possible null pointer dereference
[accel-pppd/ppp/ipv6cp_opt_intfid.c:185]: (warning) %x in format string (no. 1) requires 'unsigned int *' but the argument type is 'signed int *'.
[accel-pppd/ppp/ipv6cp_opt_intfid.c:298]: (warning) %x in format string (no. 1) requires 'unsigned int *' but the argument type is 'int *'.
[accel-pppd/ppp/ipv6cp_opt_intfid.c:298]: (warning) %x in format string (no. 2) requires 'unsigned int *' but the argument type is 'signed int *'.
[accel-pppd/ppp/ipv6cp_opt_intfid.c:298]: (warning) %x in format string (no. 3) requires 'unsigned int *' but the argument type is 'signed int *'.
[accel-pppd/ppp/ipv6cp_opt_intfid.c:298]: (warning) %x in format string (no. 4) requires 'unsigned int *' but the argument type is 'signed int *'.
* Suppress compiler warnings
* Fix locking errors
/opt/pvs/accel-ppp/accel-pppd/extra/pppd_compat.c 279 warn V1020 The function exited without calling the 'sigchld_unlock' function. Check lines: 279, 249.
/opt/pvs/accel-ppp/accel-pppd/extra/pppd_compat.c 333 warn V1020 The function exited without calling the 'sigchld_unlock' function. Check lines: 333, 315.
/opt/pvs/accel-ppp/accel-pppd/extra/pppd_compat.c 422 warn V1020 The function exited without calling the 'sigchld_unlock' function. Check lines: 422, 372.
/opt/pvs/accel-ppp/accel-pppd/extra/pppd_compat.c 488 warn V1020 The function exited without calling the 'sigchld_unlock' function. Check lines: 488, 468.
/opt/pvs/accel-ppp/accel-pppd/triton/mempool.c 119 warn V1020 The function exited without calling the 'pthread_spin_unlock' function. Check lines: 119, 116.
* Fix array len errors
/opt/pvs/accel-ppp/accel-pppd/triton/conf_file.c 75 warn V557 Array underrun is possible. The value of 'len - 1' index could reach -1.
/opt/pvs/accel-ppp/accel-pppd/triton/conf_file.c 76 warn V557 Array underrun is possible. The value of '-- len' index could reach -1.
* Fix possible memory leaks
/opt/pvs/accel-ppp/accel-pppd/radius/radius.c 936 err V773 The function was exited without releasing the 'str' pointer. A memory leak is possible.
/opt/pvs/accel-ppp/accel-pppd/radius/serv.c 622 err V773 The function was exited without releasing the 'str' pointer. A memory leak is possible.
/opt/pvs/accel-ppp/accel-pppd/triton/conf_file.c 144 err V773 The function was exited without releasing the 'raw' pointer. A memory leak is possible.
* Fix unsafe code
/opt/pvs/accel-ppp/accel-pppd/cli/tcp.c 364 warn V1004 The 'host' pointer was used unsafely after it was verified against nullptr. Check lines: 338, 364.
/opt/pvs/accel-ppp/accel-pppd/cli/telnet.c 701 warn V1004 The 'host' pointer was used unsafely after it was verified against nullptr. Check lines: 675, 701.
/opt/pvs/accel-ppp/accel-pppd/extra/ippool.c 241 err V614 Potentially uninitialized pointer 'pos' used.
/opt/pvs/accel-ppp/accel-pppd/radius/dict.c 165 err V614 Uninitialized pointer 'parent_items' used.
* Remove duplicate code
/opt/pvs/accel-ppp/accel-pppd/radius/serv.c 202 warn V547 Expression 'ts.tv_sec < req->serv->fail_time' is always false.
* Fix treating signed bool variables as unsigned
* Add nullptr checking
/opt/pvs/accel-ppp/accel-pppd/ipv6/dhcpv6.c 886 err V595 The 'opt->val' pointer was utilized before it was verified against nullptr. Check lines: 886, 890.
/opt/pvs/accel-ppp/accel-pppd/ipv6/nd.c 479 err V595 The 'opt->val' pointer was utilized before it was verified against nullptr. Check lines: 479, 483.
/opt/pvs/accel-ppp/accel-pppd/radius/auth.c 152 err V595 The 'rpd->auth_ctx' pointer was utilized before it was verified against nullptr. Check lines: 152, 154.
/opt/pvs/accel-ppp/accel-pppd/triton/conf_file.c 114 err V595 The 'cur_sect' pointer was utilized before it was verified against nullptr. Check lines: 114, 117.
* Add logging of exit conditions
* Clarify calculation
[accel-pppd/ppp/ccp_mppe.c:281]: (style) Clarify calculation precedence for '&' and '?'.
[accel-pppd/ppp/ccp_mppe.c:282]: (style) Clarify calculation precedence for '&' and '?'.
[accel-pppd/ppp/ccp_mppe.c:283]: (style) Clarify calculation precedence for '&' and '?'.
[accel-pppd/ppp/ccp_mppe.c:284]: (style) Clarify calculation precedence for '&' and '?'.
[accel-pppd/ppp/ccp_mppe.c:285]: (style) Clarify calculation precedence for '&' and '?'.
[accel-pppd/ppp/ccp_mppe.c:286]: (style) Clarify calculation precedence for '&' and '?'.
[drivers/ipoe/ipoe.c:307]: (style) Clarify calculation precedence for '&' and '?'.
* Fix void calculations
[accel-pppd/ctrl/pppoe/disc.c:211]: (portability) 'pkt' is of type 'void *'. When using void pointers in calculations, the behaviour is undefined.
[accel-pppd/ctrl/pptp/pptp.c:150]: (portability) 'buf' is of type 'void *'. When using void pointers in calculations, the behaviour is undefined.
[accel-pppd/radius/acct.c:37]: (portability) 'req.pack.buf' is of type 'void *'. When using void pointers in calculations, the behaviour is undefined.
[accel-pppd/radius/auth.c:35]: (portability) 'req.pack.buf' is of type 'void *'. When using void pointers in calculations, the behaviour is undefined.
[accel-pppd/radius/auth.c:79]: (portability) 'req.pack.buf' is of type 'void *'. When using void pointers in calculations, the behaviour is undefined.
[accel-pppd/radius/dm_coa.c:43]: (portability) 'pack.buf' is of type 'void *'. When using void pointers in calculations, the behaviour is undefined.
[accel-pppd/radius/dm_coa.c:47]: (portability) 'pack.buf' is of type 'void *'. When using void pointers in calculations, the behaviour is undefined.
[accel-pppd/radius/dm_coa.c:57]: (portability) 'pack.buf' is of type 'void *'. When using void pointers in calculations, the behaviour is undefined.
[accel-pppd/radius/dm_coa.c:65]: (portability) 'req.buf' is of type 'void *'. When using void pointers in calculations, the behaviour is undefined.
[accel-pppd/radius/dm_coa.c:97]: (portability) 'req.buf' is of type 'void *'. When using void pointers in calculations, the behaviour is undefined.
[accel-pppd/radius/serv.c:364]: (portability) 'req.pack.buf' is of type 'void *'. When using void pointers in calculations, the behaviour is undefined.
[accel-pppd/triton/mempool.c:115]: (portability) 'mmap_ptr' is of type 'void *'. When using void pointers in calculations, the behaviour is undefined.
[accel-pppd/triton/mempool.c:122]: (portability) 'mmap_ptr' is of type 'void *'. When using void pointers in calculations, the behaviour is undefined.
[accel-pppd/triton/mempool.c:276]: (portability) 'ptr' is of type 'void *'. When using void pointers in calculations, the behaviour is undefined.
* Fix void part 2
[accel-pppd/ipv6/dhcpv6.c:844]: (portability) 'conf_dnssl' is of type 'void *'. When using void pointers in calculations, the behaviour is undefined.
[accel-pppd/ipv6/nd.c:199]: (portability) '(void*)dnsslinfo' is of type 'void *'. When using void pointers in calculations, the behaviour is undefined.
[accel-pppd/ipv6/nd.c:432]: (portability) 'conf_dnssl' is of type 'void *'. When using void pointers in calculations, the behaviour is undefined.
* Fix null pointer dereference
[accel-pppd/ctrl/ipoe/ipoe.c:2048]: (warning) Possible null pointer dereference: eth
[accel-pppd/ctrl/ipoe/ipoe.c:2049]: (warning) Possible null pointer dereference: iph
* Remove redundant check
/opt/pvs/accel-ppp/accel-pppd/ctrl/l2tp/packet.c 656 warn V547 Expression 'attr->length <= 16' is always false.
* PR fixes
* PR fixes 2
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[accel-pppd/ctrl/ipoe/ipoe.c:4054]: (style) A pointer can not be negative so it is either pointless or an error to check if it is not.
[accel-pppd/logs/log_syslog.c:148]: (error) Array 'facility_name[9]' accessed at index 35, which is out of bounds.
[accel-pppd/lua/session.c:274]: (error) Common realloc mistake: 'mods' nulled but not freed upon failure
[accel-pppd/extra/ippool.c:114]: (warning) %u in format string (no. 1) requires 'unsigned int *' but the argument type is 'int *'.
[accel-pppd/extra/ippool.c:114]: (warning) %u in format string (no. 2) requires 'unsigned int *' but the argument type is 'int *'.
[accel-pppd/extra/ippool.c:114]: (warning) %u in format string (no. 3) requires 'unsigned int *' but the argument type is 'int *'.
[accel-pppd/extra/ippool.c:114]: (warning) %u in format string (no. 4) requires 'unsigned int *' but the argument type is 'int *'.
[accel-pppd/extra/ippool.c:114]: (warning) %u in format string (no. 5) requires 'unsigned int *' but the argument type is 'int *'.
[accel-pppd/extra/ippool.c:141]: (warning) %u in format string (no. 1) requires 'unsigned int *' but the argument type is 'int *'.
[accel-pppd/extra/ippool.c:141]: (warning) %u in format string (no. 2) requires 'unsigned int *' but the argument type is 'int *'.
[accel-pppd/extra/ippool.c:141]: (warning) %u in format string (no. 3) requires 'unsigned int *' but the argument type is 'int *'.
[accel-pppd/extra/ippool.c:141]: (warning) %u in format string (no. 4) requires 'unsigned int *' but the argument type is 'int *'.
[accel-pppd/extra/ippool.c:141]: (warning) %u in format string (no. 5) requires 'unsigned int *' but the argument type is 'int *'.
[accel-pppd/main.c:97]: (warning) %d in format string (no. 1) requires 'int *' but the argument type is 'unsigned int *'.
[accel-pppd/radius/radius.c:687] -> [accel-pppd/radius/radius.c:690]: (warning) Possible null pointer dereference: rpd - otherwise it is redundant to check it against null.
[accel-pppd/radius/serv.c:805] -> [accel-pppd/radius/serv.c:829]: (warning) Possible null pointer dereference: ptr2 - otherwise it is redundant to check it against null.
[accel-pppd/radius/serv.c:813] -> [accel-pppd/radius/serv.c:829]: (warning) Possible null pointer dereference: ptr2 - otherwise it is redundant to check it against null.
[accel-pppd/radius/serv.c:823] -> [accel-pppd/radius/serv.c:829]: (warning) Possible null pointer dereference: ptr2 - otherwise it is redundant to check it against null.
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