include $(INCLUDE_DIR)/kernel.mk
PKG_NAME:=ppp
-PKG_RELEASE:=4
+PKG_RELEASE:=5
PKG_SOURCE_PROTO:=git
PKG_SOURCE_URL:=https://github.com/paulusmack/ppp
--- /dev/null
+From 98ec18f098e5ef68e3a8cc6954fcaf5a7fb8b7be Mon Sep 17 00:00:00 2001
+From: pali <7141871+pali@users.noreply.github.com>
+Date: Mon, 15 Feb 2021 07:54:01 +0100
+Subject: [PATCH] pppd: Fix compilation with older glibc or kernel headers
+ (#248)
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+glibc versions prior to 2.24 do not define SOL_NETLINK and linux kernel
+versions prior to 4.3 do not define NETLINK_CAP_ACK. So add fallback
+definitions for these macros into pppd/sys-linux.c file.
+
+Also extend description why we call SOL_NETLINK/NETLINK_CAP_ACK option.
+
+Signed-off-by: Pali Rohár <pali@kernel.org>
+---
+ pppd/sys-linux.c | 18 +++++++++++++++++-
+ 1 file changed, 17 insertions(+), 1 deletion(-)
+
+--- a/pppd/sys-linux.c
++++ b/pppd/sys-linux.c
+@@ -125,6 +125,14 @@
+ #include <linux/netlink.h>
+ #include <linux/rtnetlink.h>
+ #include <linux/if_addr.h>
++/* glibc versions prior to 2.24 do not define SOL_NETLINK */
++#ifndef SOL_NETLINK
++#define SOL_NETLINK 270
++#endif
++/* linux kernel versions prior to 4.3 do not define/support NETLINK_CAP_ACK */
++#ifndef NETLINK_CAP_ACK
++#define NETLINK_CAP_ACK 10
++#endif
+ #endif
+
+ #include "pppd.h"
+@@ -2843,7 +2851,15 @@ static int append_peer_ipv6_address(unsi
+ if (fd < 0)
+ return 0;
+
+- /* do not ask for error message content */
++ /*
++ * Tell kernel to not send to us payload of acknowledgment error message.
++ * NETLINK_CAP_ACK option is supported since Linux kernel version 4.3 and
++ * older kernel versions always send full payload in acknowledgment netlink
++ * message. We ignore payload of this message as we need only error code,
++ * to check if our set remote peer address request succeeded or failed.
++ * So ignore return value from the following setsockopt() call as setting
++ * option NETLINK_CAP_ACK means for us just a kernel hint / optimization.
++ */
+ one = 1;
+ setsockopt(fd, SOL_NETLINK, NETLINK_CAP_ACK, &one, sizeof(one));
+
--- /dev/null
+From 81ad945630120cc1c27c8bb00503be42b76ff202 Mon Sep 17 00:00:00 2001
+From: Jaco Kroon <jaco@uls.co.za>
+Date: Thu, 13 Jan 2022 08:38:04 +0200
+Subject: [PATCH] Expand byte count statistics to 64 bits (#298)
+
+* Add Gigawords to radius packets where applicable.
+
+IMPORTANT NOTE: The ioctl() only supports 32-bit counters. In order t
+obtain 64-bit counters, these are now pulled in from sysfs (it's assumed
+to be mounted on /sys which I'm assuming is standard).
+
+It is unknown whether sysfs will be available everywhere, as such, keep
+the ioctl() method in place, but attempt to detect wrap-overs.
+
+If the sysfs mechanism fails, fail back to the ioctl().
+
+Given maximum data rates, the intervals between calling this needs to be
+such that no more than 4GB (2^32) bytes are sent or received in any
+given interval. Mostly important for radius plugin where data
+accounting may be in effect.
+
+Towards this, a timer interval on 25 seconds is set to force a ioctl()
+poll irrespective of the rate of stats update calls. This may be
+important for especially radius that needs to provide interim-update
+intervals, if the interim updates is too long and the counters could
+wrap-over twice in a single interval. At 25 seconds we should detect
+all wraps up to an effective data rate of 1.37Gbps, which for my
+purposes is adequate.
+
+Possible downsides, 4 files are opened, read and closed every time
+statistics is requested. This results in 12 system calls every single
+time statistics is required, compared to 1 for the ioctl. Efficiency is
+unknown, but as a rule of thumb fewer system calls are better, this is
+however not a critical path in my opinion, so should not be a problem.
+If required I can run a few benchmarks using gettimeofday() to measure
+actual impact.
+
+Signed-off-by: Jaco Kroon <jaco@uls.co.za>
+
+* Use netlink if possible to obtain 64-bit stats.
+
+This uses two system calls per round.
+
+This should be preferred where available. It seems the RTM_GETSTATS was
+only added from 2016 some point (4.7.0 as per pali), which is in my
+opinion old, but given experience with certain embedded systems does
+need to be supported.
+
+Signed-off-by: Jaco Kroon <jaco@uls.co.za>
+
+Co-authored-by: Jaco Kroon <jaco@iewc.co.za>
+---
+ pppd/main.c | 5 +-
+ pppd/plugins/radius/etc/dictionary | 2 +
+ pppd/plugins/radius/radius.c | 28 ++-
+ pppd/plugins/radius/radiusclient.h | 2 +
+ pppd/pppd.h | 9 +-
+ pppd/sys-linux.c | 281 ++++++++++++++++++++++++++++-
+ 6 files changed, 313 insertions(+), 14 deletions(-)
+
+--- a/pppd/main.c
++++ b/pppd/main.c
+@@ -87,6 +87,7 @@
+ #include <sys/socket.h>
+ #include <netinet/in.h>
+ #include <arpa/inet.h>
++#include <inttypes.h>
+
+ #include "pppd.h"
+ #include "magic.h"
+@@ -1230,9 +1231,9 @@ update_link_stats(int u)
+
+ slprintf(numbuf, sizeof(numbuf), "%u", link_connect_time);
+ script_setenv("CONNECT_TIME", numbuf, 0);
+- slprintf(numbuf, sizeof(numbuf), "%u", link_stats.bytes_out);
++ snprintf(numbuf, sizeof(numbuf), "%" PRIu64, link_stats.bytes_out);
+ script_setenv("BYTES_SENT", numbuf, 0);
+- slprintf(numbuf, sizeof(numbuf), "%u", link_stats.bytes_in);
++ snprintf(numbuf, sizeof(numbuf), "%" PRIu64, link_stats.bytes_in);
+ script_setenv("BYTES_RCVD", numbuf, 0);
+ }
+
+--- a/pppd/plugins/radius/etc/dictionary
++++ b/pppd/plugins/radius/etc/dictionary
+@@ -82,6 +82,8 @@ ATTRIBUTE Acct-Session-Time 46 integer
+ ATTRIBUTE Acct-Input-Packets 47 integer
+ ATTRIBUTE Acct-Output-Packets 48 integer
+ ATTRIBUTE Acct-Terminate-Cause 49 integer
++ATTRIBUTE Acct-Input-Gigawords 52 integer
++ATTRIBUTE Acct-Output-Gigawords 53 integer
+ ATTRIBUTE Chap-Challenge 60 string
+ ATTRIBUTE NAS-Port-Type 61 integer
+ ATTRIBUTE Port-Limit 62 integer
+--- a/pppd/plugins/radius/radius.c
++++ b/pppd/plugins/radius/radius.c
+@@ -1020,12 +1020,22 @@ radius_acct_stop(void)
+ av_type = link_connect_time;
+ rc_avpair_add(&send, PW_ACCT_SESSION_TIME, &av_type, 0, VENDOR_NONE);
+
+- av_type = link_stats.bytes_out;
++ av_type = link_stats.bytes_out & 0xFFFFFFFF;
+ rc_avpair_add(&send, PW_ACCT_OUTPUT_OCTETS, &av_type, 0, VENDOR_NONE);
+
+- av_type = link_stats.bytes_in;
++ if (link_stats.bytes_out > 0xFFFFFFFF) {
++ av_type = link_stats.bytes_out >> 32;
++ rc_avpair_add(&send, PW_ACCT_OUTPUT_GIGAWORDS, &av_type, 0, VENDOR_NONE);
++ }
++
++ av_type = link_stats.bytes_in & 0xFFFFFFFF;
+ rc_avpair_add(&send, PW_ACCT_INPUT_OCTETS, &av_type, 0, VENDOR_NONE);
+
++ if (link_stats.bytes_in > 0xFFFFFFFF) {
++ av_type = link_stats.bytes_in >> 32;
++ rc_avpair_add(&send, PW_ACCT_INPUT_GIGAWORDS, &av_type, 0, VENDOR_NONE);
++ }
++
+ av_type = link_stats.pkts_out;
+ rc_avpair_add(&send, PW_ACCT_OUTPUT_PACKETS, &av_type, 0, VENDOR_NONE);
+
+@@ -1172,12 +1182,22 @@ radius_acct_interim(void *ignored)
+ av_type = link_connect_time;
+ rc_avpair_add(&send, PW_ACCT_SESSION_TIME, &av_type, 0, VENDOR_NONE);
+
+- av_type = link_stats.bytes_out;
++ av_type = link_stats.bytes_out & 0xFFFFFFFF;
+ rc_avpair_add(&send, PW_ACCT_OUTPUT_OCTETS, &av_type, 0, VENDOR_NONE);
+
+- av_type = link_stats.bytes_in;
++ if (link_stats.bytes_out > 0xFFFFFFFF) {
++ av_type = link_stats.bytes_out >> 32;
++ rc_avpair_add(&send, PW_ACCT_OUTPUT_GIGAWORDS, &av_type, 0, VENDOR_NONE);
++ }
++
++ av_type = link_stats.bytes_in & 0xFFFFFFFF;
+ rc_avpair_add(&send, PW_ACCT_INPUT_OCTETS, &av_type, 0, VENDOR_NONE);
+
++ if (link_stats.bytes_in > 0xFFFFFFFF) {
++ av_type = link_stats.bytes_in >> 32;
++ rc_avpair_add(&send, PW_ACCT_INPUT_GIGAWORDS, &av_type, 0, VENDOR_NONE);
++ }
++
+ av_type = link_stats.pkts_out;
+ rc_avpair_add(&send, PW_ACCT_OUTPUT_PACKETS, &av_type, 0, VENDOR_NONE);
+
+--- a/pppd/plugins/radius/radiusclient.h
++++ b/pppd/plugins/radius/radiusclient.h
+@@ -184,6 +184,8 @@ typedef struct pw_auth_hdr
+ #define PW_ACCT_LINK_COUNT 51 /* integer */
+
+ /* From RFC 2869 */
++#define PW_ACCT_INPUT_GIGAWORDS 52 /* integer */
++#define PW_ACCT_OUTPUT_GIGAWORDS 53 /* integer */
+ #define PW_ACCT_INTERIM_INTERVAL 85 /* integer */
+
+ /* Merit Experimental Extensions */
+--- a/pppd/pppd.h
++++ b/pppd/pppd.h
+@@ -53,6 +53,7 @@
+ #include <stdlib.h> /* for encrypt */
+ #include <unistd.h> /* for setkey */
+ #include <stdarg.h>
++#include <stdint.h>
+ #include <limits.h> /* for NGROUPS_MAX */
+ #include <sys/param.h> /* for MAXPATHLEN and BSD4_4, if defined */
+ #include <sys/types.h> /* for u_int32_t, if defined */
+@@ -173,8 +174,8 @@ struct permitted_ip {
+ * pppd needs.
+ */
+ struct pppd_stats {
+- unsigned int bytes_in;
+- unsigned int bytes_out;
++ uint64_t bytes_in;
++ uint64_t bytes_out;
+ unsigned int pkts_in;
+ unsigned int pkts_out;
+ };
+@@ -347,7 +348,7 @@ extern char *max_tls_version;
+ extern unsigned int maxoctets; /* Maximum octetes per session (in bytes) */
+ extern int maxoctets_dir; /* Direction :
+ 0 - in+out (default)
+- 1 - in
++ 1 - in
+ 2 - out
+ 3 - max(in,out) */
+ extern int maxoctets_timeout; /* Timeout for check of octets limit */
+@@ -356,7 +357,7 @@ extern int maxoctets_timeout; /*
+ #define PPP_OCTETS_DIRECTION_OUT 2
+ #define PPP_OCTETS_DIRECTION_MAXOVERAL 3
+ /* same as previos, but little different on RADIUS side */
+-#define PPP_OCTETS_DIRECTION_MAXSESSION 4
++#define PPP_OCTETS_DIRECTION_MAXSESSION 4
+ #endif
+
+ #ifdef PPP_FILTER
+--- a/pppd/sys-linux.c
++++ b/pppd/sys-linux.c
+@@ -79,6 +79,7 @@
+ #include <sys/sysmacros.h>
+
+ #include <errno.h>
++#include <stddef.h>
+ #include <stdio.h>
+ #include <stdlib.h>
+ #include <syslog.h>
+@@ -92,6 +93,7 @@
+ #include <ctype.h>
+ #include <termios.h>
+ #include <unistd.h>
++#include <limits.h>
+
+ /* This is in netdevice.h. However, this compile will fail miserably if
+ you attempt to include netdevice.h because it has so many references
+@@ -121,9 +123,19 @@
+ #include <linux/ppp_defs.h>
+ #include <linux/if_ppp.h>
+
+-#ifdef INET6
+ #include <linux/netlink.h>
+ #include <linux/rtnetlink.h>
++#include <linux/if_link.h>
++/* Attempt at retaining compile-support with older than 4.7 kernels, or kernels
++ * where RTM_NEWSTATS isn't defined for whatever reason.
++ */
++#ifndef RTM_NEWSTATS
++#define RTM_NEWSTATS 92
++#define RTM_GETSTATS 94
++#define IFLA_STATS_LINK_64 1
++#endif
++
++#ifdef INET6
+ #include <linux/if_addr.h>
+ /* glibc versions prior to 2.24 do not define SOL_NETLINK */
+ #ifndef SOL_NETLINK
+@@ -1407,11 +1419,17 @@ get_idle_time(int u, struct ppp_idle *ip
+
+ /********************************************************************
+ *
+- * get_ppp_stats - return statistics for the link.
++ * get_ppp_stats_iocl - return statistics for the link, using the ioctl() method,
++ * this only supports 32-bit counters, so need to count the wraps.
+ */
+-int
+-get_ppp_stats(int u, struct pppd_stats *stats)
++static int
++get_ppp_stats_ioctl(int u, struct pppd_stats *stats)
+ {
++ static u_int32_t previbytes = 0;
++ static u_int32_t prevobytes = 0;
++ static u_int32_t iwraps = 0;
++ static u_int32_t owraps = 0;
++
+ struct ifpppstatsreq req;
+
+ memset (&req, 0, sizeof (req));
+@@ -1426,7 +1444,262 @@ get_ppp_stats(int u, struct pppd_stats *
+ stats->bytes_out = req.stats.p.ppp_obytes;
+ stats->pkts_in = req.stats.p.ppp_ipackets;
+ stats->pkts_out = req.stats.p.ppp_opackets;
++
++ if (stats->bytes_in < previbytes)
++ ++iwraps;
++ if (stats->bytes_out < prevobytes)
++ ++owraps;
++
++ previbytes = stats->bytes_in;
++ prevobytes = stats->bytes_out;
++
++ stats->bytes_in += (uint64_t)iwraps << 32;
++ stats->bytes_out += (uint64_t)owraps << 32;
++
++ return 1;
++}
++
++/********************************************************************
++ * get_ppp_stats_rtnetlink - return statistics for the link, using rtnetlink
++ * This provides native 64-bit counters.
++ */
++static int
++get_ppp_stats_rtnetlink(int u, struct pppd_stats *stats)
++{
++ static int rtnl_fd = -1;
++
++ struct sockaddr_nl nladdr;
++ struct {
++ struct nlmsghdr nlh;
++ struct if_stats_msg ifsm;
++ } nlreq;
++ struct nlresp {
++ struct nlmsghdr nlh;
++ union {
++ struct {
++ struct nlmsgerr nlerr;
++ char __end_err[0];
++ };
++ struct {
++ struct rtmsg rth;
++ struct {
++ /* We only case about these first fields from rtnl_link_stats64 */
++ uint64_t rx_packets;
++ uint64_t tx_packets;
++ uint64_t rx_bytes;
++ uint64_t tx_bytes;
++ } stats;
++ char __end_stats[0];
++ };
++ };
++ } nlresp;
++ ssize_t nlresplen;
++ struct iovec iov;
++ struct msghdr msg;
++
++ memset(&nladdr, 0, sizeof(nladdr));
++ nladdr.nl_family = AF_NETLINK;
++
++ if (rtnl_fd < 0) {
++ rtnl_fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
++ if (rtnl_fd < 0) {
++ error("get_ppp_stats_rtnetlink: error creating NETLINK socket: %m (line %d)", __LINE__);
++ return 0;
++ }
++
++ if (bind(rtnl_fd, (struct sockaddr *)&nladdr, sizeof(nladdr)) < 0) {
++ error("get_ppp_stats_rtnetlink: bind(AF_NETLINK): %m (line %d)", __LINE__);
++ goto err;
++ }
++ }
++
++ memset(&nlreq, 0, sizeof(nlreq));
++ nlreq.nlh.nlmsg_len = sizeof(nlreq);
++ nlreq.nlh.nlmsg_type = RTM_GETSTATS;
++ nlreq.nlh.nlmsg_flags = NLM_F_REQUEST;
++
++ nlreq.ifsm.ifindex = if_nametoindex(ifname);
++ nlreq.ifsm.filter_mask = IFLA_STATS_LINK_64;
++
++ memset(&iov, 0, sizeof(iov));
++ iov.iov_base = &nlreq;
++ iov.iov_len = sizeof(nlreq);
++
++ memset(&msg, 0, sizeof(msg));
++ msg.msg_name = &nladdr;
++ msg.msg_namelen = sizeof(nladdr);
++ msg.msg_iov = &iov;
++ msg.msg_iovlen = 1;
++
++ if (sendmsg(rtnl_fd, &msg, 0) < 0) {
++ error("get_ppp_stats_rtnetlink: sendmsg(RTM_GETSTATS): %m (line %d)", __LINE__);
++ goto err;
++ }
++
++ /* We just need to repoint to IOV ... everything else stays the same */
++ iov.iov_base = &nlresp;
++ iov.iov_len = sizeof(nlresp);
++
++ nlresplen = recvmsg(rtnl_fd, &msg, 0);
++
++ if (nlresplen < 0) {
++ error("get_ppp_stats_rtnetlink: recvmsg(RTM_GETSTATS): %m (line %d)", __LINE__);
++ goto err;
++ }
++
++ if (nlresplen < sizeof(nlresp.nlh)) {
++ error("get_ppp_stats_rtnetlink: Netlink response message was incomplete (line %d)", __LINE__);
++ goto err;
++ }
++
++ if (nlresp.nlh.nlmsg_type == NLMSG_ERROR) {
++ if (nlresplen < offsetof(struct nlresp, __end_err)) {
++ if (kernel_version >= KVERSION(4,7,0))
++ error("get_ppp_stats_rtnetlink: Netlink responded with error: %s (line %d)", strerror(-nlresp.nlerr.error), __LINE__);
++ } else {
++ error("get_ppp_stats_rtnetlink: Netlink responded with an error message, but the nlmsgerr structure is incomplete (line %d).",
++ __LINE__);
++ }
++ goto err;
++ }
++
++ if (nlresp.nlh.nlmsg_type != RTM_NEWSTATS) {
++ error("get_ppp_stats_rtnetlink: Expected RTM_NEWSTATS response, found something else (mlmsg_type %d, line %d)",
++ nlresp.nlh.nlmsg_type, __LINE__);
++ goto err;
++ }
++
++ if (nlresplen < offsetof(struct nlresp, __end_stats)) {
++ error("get_ppp_stats_rtnetlink: Obtained an insufficiently sized rtnl_link_stats64 struct from the kernel (line %d).", __LINE__);
++ goto err;
++ }
++
++ stats->bytes_in = nlresp.stats.rx_bytes;
++ stats->bytes_out = nlresp.stats.tx_bytes;
++ stats->pkts_in = nlresp.stats.rx_packets;
++ stats->pkts_out = nlresp.stats.tx_packets;
++
+ return 1;
++err:
++ close(rtnl_fd);
++ rtnl_fd = -1;
++ return 0;
++}
++
++/********************************************************************
++ * get_ppp_stats_sysfs - return statistics for the link, using the files in sysfs,
++ * this provides native 64-bit counters.
++ */
++static int
++get_ppp_stats_sysfs(int u, struct pppd_stats *stats)
++{
++ char fname[PATH_MAX+1];
++ char buf[21], *err; /* 2^64 < 10^20 */
++ int blen, fd, rlen;
++ unsigned long long val;
++
++ struct {
++ const char* fname;
++ void* ptr;
++ unsigned size;
++ } slist[] = {
++#define statfield(fn, field) { .fname = #fn, .ptr = &stats->field, .size = sizeof(stats->field) }
++ statfield(rx_bytes, bytes_in),
++ statfield(tx_bytes, bytes_out),
++ statfield(rx_packets, pkts_in),
++ statfield(tx_packets, pkts_out),
++#undef statfield
++ };
++
++ blen = snprintf(fname, sizeof(fname), "/sys/class/net/%s/statistics/", ifname);
++ if (blen >= sizeof(fname))
++ return 0; /* ifname max 15, so this should be impossible */
++
++ for (int i = 0; i < sizeof(slist) / sizeof(*slist); ++i) {
++ if (snprintf(fname + blen, sizeof(fname) - blen, "%s", slist[i].fname) >= sizeof(fname) - blen) {
++ fname[blen] = 0;
++ error("sysfs stats: filename %s/%s overflowed PATH_MAX", fname, slist[i].fname);
++ return 0;
++ }
++
++ fd = open(fname, O_RDONLY);
++ if (fd < 0) {
++ error("%s: %m", fname);
++ return 0;
++ }
++
++ rlen = read(fd, buf, sizeof(buf) - 1);
++ close(fd);
++ if (rlen < 0) {
++ error("%s: %m", fname);
++ return 0;
++ }
++ /* trim trailing \n if present */
++ while (rlen > 0 && buf[rlen-1] == '\n')
++ rlen--;
++ buf[rlen] = 0;
++
++ errno = 0;
++ val = strtoull(buf, &err, 10);
++ if (*buf < '0' || *buf > '9' || errno != 0 || *err) {
++ error("string to number conversion error converting %s (from %s) for remaining string %s%s%s",
++ buf, fname, err, errno ? ": " : "", errno ? strerror(errno) : "");
++ return 0;
++ }
++ switch (slist[i].size) {
++#define stattype(type) case sizeof(type): *(type*)slist[i].ptr = (type)val; break
++ stattype(uint64_t);
++ stattype(uint32_t);
++ stattype(uint16_t);
++ stattype(uint8_t);
++#undef stattype
++ default:
++ error("Don't know how to store stats for %s of size %u", slist[i].fname, slist[i].size);
++ return 0;
++ }
++ }
++
++ return 1;
++}
++
++/********************************************************************
++ * Periodic timer function to be used to keep stats up to date in case of ioctl
++ * polling.
++ *
++ * Given the 25s interval this should be fine up to data rates of 1.37Gbps.
++ * If you do change the timer, remember to also bring the get_ppp_stats (which
++ * sets up the initial trigger) as well.
++ */
++static void
++ppp_stats_poller(void* u)
++{
++ struct pppd_stats dummy;
++ get_ppp_stats_ioctl((long)u, &dummy);
++ TIMEOUT(ppp_stats_poller, u, 25);
++}
++
++/********************************************************************
++ * get_ppp_stats - return statistics for the link.
++ */
++int get_ppp_stats(int u, struct pppd_stats *stats)
++{
++ static int (*func)(int, struct pppd_stats*) = NULL;
++
++ if (!func) {
++ if (get_ppp_stats_rtnetlink(u, stats)) {
++ func = get_ppp_stats_rtnetlink;
++ return 1;
++ }
++ if (get_ppp_stats_sysfs(u, stats)) {
++ func = get_ppp_stats_sysfs;
++ return 1;
++ }
++ warn("statistics falling back to ioctl which only supports 32-bit counters");
++ func = get_ppp_stats_ioctl;
++ TIMEOUT(ppp_stats_poller, (void*)(long)u, 25);
++ }
++
++ return func(u, stats);
+ }
+
+ /********************************************************************
--- /dev/null
+From 4a54e34cf5629f9fed61f0b7d69ee3ba4d874bc6 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
+Date: Sat, 9 Jul 2022 13:40:24 +0200
+Subject: [PATCH] pppd: Add support for registering ppp interface via Linux
+ rtnetlink API
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+pppd currently creates ppp network interface via PPPIOCNEWUNIT ioctl API.
+This API creates a new ppp network interface named "ppp<unit_id>". If user
+supply option "ifname" with custom network name then pppd calls SIOCSIFNAME
+ioctl to rename "ppp<unit_id>" to custom name immediately after successful
+PPPIOCNEWUNIT ioctl call. If custom name is already registered then
+SIOCSIFNAME ioctl fails and pppd close current channel (which destroy also
+network interface).
+
+This has side effect that in the first few miliseconds interface has
+different name as what user supplied.
+
+Tools like systemd, udev or NetworkManager are trying to query
+interface attributes based on interface name immediately when new
+network interface is created.
+
+But if interface is renamed immediately after creation then these tools
+fails. For example when running pppd with option "ifname ppp-wan" following
+error is reported by systemd / udev into dmesg log:
+
+ [ 35.718732] PPP generic driver version 2.4.2
+ [ 35.793914] NET: Registered protocol family 24
+ [ 35.889924] systemd-udevd[1852]: link_config: autonegotiation is unset or enabled, the speed and duplex are not writable.
+ [ 35.901450] ppp-wan: renamed from ppp0
+ [ 35.930332] systemd-udevd[1852]: link_config: could not get ethtool features for ppp0
+ [ 35.939473] systemd-udevd[1852]: Could not set offload features of ppp0: No such device
+
+There is an easy way to fix this issue: Use new rtnetlink API.
+
+Via rtnetlink API it is possible to create ppp network interface with
+custom ifname atomically. Just it is not possible to specify custom ppp
+unit id.
+
+So use new rtnetlink API when user requested custom ifname without custom
+ppp unit id. This will avoid system issues with interface renaming as ppp
+interface is directly registered with specified final name.
+
+This has also advantage that if requested interface name already exists
+then pppd fail during registering of networking interface and not during
+renaming network interface which happens after successful registration.
+
+If user supply custom ppp unit id then it is required to use old ioctl API
+as currently it is the only API which allows specifying ppp unit id.
+
+When user does not specify custom ifname stay also with old ioctl API.
+There is currently a bug in kernel which cause that when empty interface is
+specified in rtnetlink message for creating ppp interface then kernel
+creates ppp interface but with pseudo-random name, not derived from ppp
+unit id. And therefore it is not possible to retrieve what is the name of
+newly created network interface. So when user does not specify interface
+name via "ifname" option (which means that want from kernel to choose some
+"free" interface name) it is needed to use old ioctl API which do it
+correctly for now.
+
+Signed-off-by: Pali Rohár <pali@kernel.org>
+---
+ pppd/sys-linux.c | 194 ++++++++++++++++++++++++++++++++++++++++++++++-
+ 1 file changed, 192 insertions(+), 2 deletions(-)
+
+--- a/pppd/sys-linux.c
++++ b/pppd/sys-linux.c
+@@ -126,6 +126,11 @@
+ #include <linux/netlink.h>
+ #include <linux/rtnetlink.h>
+ #include <linux/if_link.h>
++
++#ifdef INET6
++#include <linux/if_addr.h>
++#endif
++
+ /* Attempt at retaining compile-support with older than 4.7 kernels, or kernels
+ * where RTM_NEWSTATS isn't defined for whatever reason.
+ */
+@@ -135,16 +140,20 @@
+ #define IFLA_STATS_LINK_64 1
+ #endif
+
+-#ifdef INET6
+-#include <linux/if_addr.h>
+ /* glibc versions prior to 2.24 do not define SOL_NETLINK */
+ #ifndef SOL_NETLINK
+ #define SOL_NETLINK 270
+ #endif
++
+ /* linux kernel versions prior to 4.3 do not define/support NETLINK_CAP_ACK */
+ #ifndef NETLINK_CAP_ACK
+ #define NETLINK_CAP_ACK 10
+ #endif
++
++/* linux kernel versions prior to 4.7 do not define/support IFLA_PPP_DEV_FD */
++#ifndef IFLA_PPP_MAX
++/* IFLA_PPP_DEV_FD is declared as enum when IFLA_PPP_MAX is defined */
++#define IFLA_PPP_DEV_FD 1
+ #endif
+
+ #include "pppd.h"
+@@ -657,6 +666,160 @@ void generic_disestablish_ppp(int dev_fd
+ }
+
+ /*
++ * make_ppp_unit_rtnetlink - register a new ppp network interface for ppp_dev_fd
++ * with specified req_ifname via rtnetlink. Interface name req_ifname must not
++ * be empty. Custom ppp unit id req_unit is ignored and kernel choose some free.
++ */
++static int make_ppp_unit_rtnetlink(void)
++{
++ struct {
++ struct nlmsghdr nlh;
++ struct ifinfomsg ifm;
++ struct {
++ struct rtattr rta;
++ char ifname[IFNAMSIZ];
++ } ifn;
++ struct {
++ struct rtattr rta;
++ struct {
++ struct rtattr rta;
++ char ifkind[sizeof("ppp")];
++ } ifik;
++ struct {
++ struct rtattr rta;
++ struct {
++ struct rtattr rta;
++ union {
++ int ppp_dev_fd;
++ } ppp;
++ } ifdata[1];
++ } ifid;
++ } ifli;
++ } nlreq;
++ struct {
++ struct nlmsghdr nlh;
++ struct nlmsgerr nlerr;
++ } nlresp;
++ struct sockaddr_nl nladdr;
++ struct iovec iov;
++ struct msghdr msg;
++ ssize_t nlresplen;
++ int one;
++ int fd;
++
++ fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
++ if (fd < 0) {
++ error("make_ppp_unit_rtnetlink: socket(NETLINK_ROUTE): %m (line %d)", __LINE__);
++ return 0;
++ }
++
++ /* Tell kernel to not send to us payload of acknowledgment error message. */
++ one = 1;
++ setsockopt(fd, SOL_NETLINK, NETLINK_CAP_ACK, &one, sizeof(one));
++
++ memset(&nladdr, 0, sizeof(nladdr));
++ nladdr.nl_family = AF_NETLINK;
++
++ if (bind(fd, (struct sockaddr *)&nladdr, sizeof(nladdr)) < 0) {
++ error("make_ppp_unit_rtnetlink: bind(AF_NETLINK): %m (line %d)", __LINE__);
++ close(fd);
++ return 0;
++ }
++
++ memset(&nlreq, 0, sizeof(nlreq));
++ nlreq.nlh.nlmsg_len = sizeof(nlreq);
++ nlreq.nlh.nlmsg_type = RTM_NEWLINK;
++ nlreq.nlh.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | NLM_F_EXCL | NLM_F_CREATE;
++ nlreq.ifm.ifi_family = AF_UNSPEC;
++ nlreq.ifm.ifi_type = ARPHRD_NETROM;
++ nlreq.ifn.rta.rta_len = sizeof(nlreq.ifn);
++ nlreq.ifn.rta.rta_type = IFLA_IFNAME;
++ strlcpy(nlreq.ifn.ifname, req_ifname, sizeof(nlreq.ifn.ifname));
++ nlreq.ifli.rta.rta_len = sizeof(nlreq.ifli);
++ nlreq.ifli.rta.rta_type = IFLA_LINKINFO;
++ nlreq.ifli.ifik.rta.rta_len = sizeof(nlreq.ifli.ifik);
++ nlreq.ifli.ifik.rta.rta_type = IFLA_INFO_KIND;
++ strcpy(nlreq.ifli.ifik.ifkind, "ppp");
++ nlreq.ifli.ifid.rta.rta_len = sizeof(nlreq.ifli.ifid);
++ nlreq.ifli.ifid.rta.rta_type = IFLA_INFO_DATA;
++ nlreq.ifli.ifid.ifdata[0].rta.rta_len = sizeof(nlreq.ifli.ifid.ifdata[0]);
++ nlreq.ifli.ifid.ifdata[0].rta.rta_type = IFLA_PPP_DEV_FD;
++ nlreq.ifli.ifid.ifdata[0].ppp.ppp_dev_fd = ppp_dev_fd;
++
++ memset(&nladdr, 0, sizeof(nladdr));
++ nladdr.nl_family = AF_NETLINK;
++
++ memset(&iov, 0, sizeof(iov));
++ iov.iov_base = &nlreq;
++ iov.iov_len = sizeof(nlreq);
++
++ memset(&msg, 0, sizeof(msg));
++ msg.msg_name = &nladdr;
++ msg.msg_namelen = sizeof(nladdr);
++ msg.msg_iov = &iov;
++ msg.msg_iovlen = 1;
++
++ if (sendmsg(fd, &msg, 0) < 0) {
++ error("make_ppp_unit_rtnetlink: sendmsg(RTM_NEWLINK/NLM_F_CREATE): %m (line %d)", __LINE__);
++ close(fd);
++ return 0;
++ }
++
++ memset(&iov, 0, sizeof(iov));
++ iov.iov_base = &nlresp;
++ iov.iov_len = sizeof(nlresp);
++
++ memset(&msg, 0, sizeof(msg));
++ msg.msg_name = &nladdr;
++ msg.msg_namelen = sizeof(nladdr);
++ msg.msg_iov = &iov;
++ msg.msg_iovlen = 1;
++
++ nlresplen = recvmsg(fd, &msg, 0);
++
++ if (nlresplen < 0) {
++ error("make_ppp_unit_rtnetlink: recvmsg(NLM_F_ACK): %m (line %d)", __LINE__);
++ close(fd);
++ return 0;
++ }
++
++ close(fd);
++
++ if (nladdr.nl_family != AF_NETLINK) {
++ error("make_ppp_unit_rtnetlink: recvmsg(NLM_F_ACK): Not a netlink packet (line %d)", __LINE__);
++ return 0;
++ }
++
++ if ((size_t)nlresplen < sizeof(nlresp) || nlresp.nlh.nlmsg_len < sizeof(nlresp)) {
++ error("make_ppp_unit_rtnetlink: recvmsg(NLM_F_ACK): Acknowledgment netlink packet too short (line %d)", __LINE__);
++ return 0;
++ }
++
++ /* acknowledgment packet for NLM_F_ACK is NLMSG_ERROR */
++ if (nlresp.nlh.nlmsg_type != NLMSG_ERROR) {
++ error("make_ppp_unit_rtnetlink: recvmsg(NLM_F_ACK): Not an acknowledgment netlink packet (line %d)", __LINE__);
++ return 0;
++ }
++
++ /* error == 0 indicates success, negative value is errno code */
++ if (nlresp.nlerr.error != 0) {
++ /*
++ * Linux kernel versions prior to 4.7 do not support creating ppp
++ * interfaces via rtnetlink API and therefore error response is
++ * expected. On older kernel versions do not show this error message.
++ * When error is different than EEXIST then pppd tries to fallback to
++ * the old ioctl method.
++ */
++ errno = (nlresp.nlerr.error < 0) ? -nlresp.nlerr.error : EINVAL;
++ if (kernel_version >= KVERSION(4,7,0))
++ error("Couldn't create ppp interface %s: %m", req_ifname);
++ return 0;
++ }
++
++ return 1;
++}
++
++/*
+ * make_ppp_unit - make a new ppp unit for ppp_dev_fd.
+ * Assumes new_style_driver.
+ */
+@@ -676,6 +839,33 @@ static int make_ppp_unit(void)
+ || fcntl(ppp_dev_fd, F_SETFL, flags | O_NONBLOCK) == -1)
+ warn("Couldn't set /dev/ppp to nonblock: %m");
+
++ /*
++ * Via rtnetlink it is possible to create ppp network interface with
++ * custom ifname atomically. But it is not possible to specify custom
++ * ppp unit id.
++ *
++ * Tools like systemd, udev or NetworkManager are trying to query
++ * interface attributes based on interface name immediately when new
++ * network interface is created. And therefore immediate interface
++ * renaming is causing issues.
++ *
++ * So use rtnetlink API only when user requested custom ifname. It will
++ * avoid system issues with interface renaming.
++ */
++ if (req_unit == -1 && req_ifname[0] != '\0' && kernel_version >= KVERSION(2,1,16)) {
++ if (make_ppp_unit_rtnetlink()) {
++ if (ioctl(ppp_dev_fd, PPPIOCGUNIT, &ifunit))
++ fatal("Couldn't retrieve PPP unit id: %m");
++ return 0;
++ }
++ /*
++ * If interface with requested name already exist return error
++ * otherwise fallback to old ioctl method.
++ */
++ if (errno == EEXIST)
++ return -1;
++ }
++
+ ifunit = req_unit;
+ x = ioctl(ppp_dev_fd, PPPIOCNEWUNIT, &ifunit);
+ if (x < 0 && req_unit >= 0 && errno == EEXIST) {
--- /dev/null
+From 44609bfc974bdafc0316d069aabf5e2903efa805 Mon Sep 17 00:00:00 2001
+From: pali <7141871+pali@users.noreply.github.com>
+Date: Tue, 9 Aug 2022 11:20:15 +0200
+Subject: [PATCH] pppd: Workaround for generating ppp unit id on Linux (#355)
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Linux kernel has nasty bug / feature. If PPPIOCNEWUNIT is called with
+negative ppp unit id (which is default option when command line argument
+"unit" is not specified; and tells kernel to choose some free ppp unit id)
+and the lowest unused/free ppp unit id is present in some existing network
+interface name prefixed by "ppp" string then this PPPIOCNEWUNIT ioctl
+fails. In this case kernel is basically unable to create a new ppp
+interface via PPPIOCNEWUNIT ioctl when user does not specify some unused
+and non-conflicted unit id.
+
+Linux kernel should be fixed to choose usable ppp unit id when was
+requested via PPPIOCNEWUNIT parameter -1.
+
+Until this happens, add a workaround for pppd to help choosing some random
+ppp unit id when kernel returns this error.
+
+Simple test case (run on system when there is no ppp interface):
+
+ sudo ./pppd ifname ppp1 nodefaultroute noauth nolock local nodetach pty "./pppd nodefaultroute noauth nolock local nodetach notty"
+
+Second pppd process without this patch prints into syslog following error:
+
+ pppd 2.4.10-dev started by pali, uid 0
+ Couldn't create new ppp unit: File exists
+ Exit.
+
+With this patch it falls back to random ppp unit id and succeeds:
+
+ pppd 2.4.10-dev started by pali, uid 0
+ Using interface ppp1361
+ Connect: ppp1361 <--> /dev/pts/14
+ ...
+
+Signed-off-by: Pali Rohár <pali@kernel.org>
+---
+ pppd/sys-linux.c | 5 +++++
+ 1 file changed, 5 insertions(+)
+
+--- a/pppd/sys-linux.c
++++ b/pppd/sys-linux.c
+@@ -873,6 +873,11 @@ static int make_ppp_unit(void)
+ ifunit = -1;
+ x = ioctl(ppp_dev_fd, PPPIOCNEWUNIT, &ifunit);
+ }
++ if (x < 0 && errno == EEXIST) {
++ srand(time(NULL) * getpid());
++ ifunit = rand() % 10000;
++ x = ioctl(ppp_dev_fd, PPPIOCNEWUNIT, &ifunit);
++ }
+ if (x < 0)
+ error("Couldn't create new ppp unit: %m");
+
--- /dev/null
+From 089687fbcc6524809ae9f4b2f8145fe3c2a91147 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
+Date: Sat, 7 Aug 2021 19:48:01 +0200
+Subject: [PATCH] pppd: Retry registering interface when on rtnetlink -EBUSY
+ error
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Due to workaround in kernel module ppp_generic.ko in function
+ppp_nl_newlink(), kernel may return -EBUSY error to prevent possible
+mutex deadlock. In this case userspace needs to retry its request.
+
+Proper way would be to fix kernel module to order requests and mutex
+locking, so prevent deadlock in kernel and so never return this error to
+userspace. Until it happens we need retry code in userspace.
+
+Signed-off-by: Pali Rohár <pali@kernel.org>
+[ backport to ppp 2.4.9 ]
+Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
+---
+ pppd/sys-linux.c | 9 ++++++++-
+ 1 file changed, 8 insertions(+), 1 deletion(-)
+
+--- a/pppd/sys-linux.c
++++ b/pppd/sys-linux.c
+@@ -707,99 +707,101 @@ static int make_ppp_unit_rtnetlink(void)
+ int one;
+ int fd;
+
+- fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
+- if (fd < 0) {
+- error("make_ppp_unit_rtnetlink: socket(NETLINK_ROUTE): %m (line %d)", __LINE__);
+- return 0;
+- }
+-
+- /* Tell kernel to not send to us payload of acknowledgment error message. */
+- one = 1;
+- setsockopt(fd, SOL_NETLINK, NETLINK_CAP_ACK, &one, sizeof(one));
++ do {
++ fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
++ if (fd < 0) {
++ error("make_ppp_unit_rtnetlink: socket(NETLINK_ROUTE): %m (line %d)", __LINE__);
++ return 0;
++ }
++
++ /* Tell kernel to not send to us payload of acknowledgment error message. */
++ one = 1;
++ setsockopt(fd, SOL_NETLINK, NETLINK_CAP_ACK, &one, sizeof(one));
++
++ memset(&nladdr, 0, sizeof(nladdr));
++ nladdr.nl_family = AF_NETLINK;
++
++ if (bind(fd, (struct sockaddr *)&nladdr, sizeof(nladdr)) < 0) {
++ error("make_ppp_unit_rtnetlink: bind(AF_NETLINK): %m (line %d)", __LINE__);
++ close(fd);
++ return 0;
++ }
++
++ memset(&nlreq, 0, sizeof(nlreq));
++ nlreq.nlh.nlmsg_len = sizeof(nlreq);
++ nlreq.nlh.nlmsg_type = RTM_NEWLINK;
++ nlreq.nlh.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | NLM_F_EXCL | NLM_F_CREATE;
++ nlreq.ifm.ifi_family = AF_UNSPEC;
++ nlreq.ifm.ifi_type = ARPHRD_NETROM;
++ nlreq.ifn.rta.rta_len = sizeof(nlreq.ifn);
++ nlreq.ifn.rta.rta_type = IFLA_IFNAME;
++ strlcpy(nlreq.ifn.ifname, req_ifname, sizeof(nlreq.ifn.ifname));
++ nlreq.ifli.rta.rta_len = sizeof(nlreq.ifli);
++ nlreq.ifli.rta.rta_type = IFLA_LINKINFO;
++ nlreq.ifli.ifik.rta.rta_len = sizeof(nlreq.ifli.ifik);
++ nlreq.ifli.ifik.rta.rta_type = IFLA_INFO_KIND;
++ strcpy(nlreq.ifli.ifik.ifkind, "ppp");
++ nlreq.ifli.ifid.rta.rta_len = sizeof(nlreq.ifli.ifid);
++ nlreq.ifli.ifid.rta.rta_type = IFLA_INFO_DATA;
++ nlreq.ifli.ifid.ifdata[0].rta.rta_len = sizeof(nlreq.ifli.ifid.ifdata[0]);
++ nlreq.ifli.ifid.ifdata[0].rta.rta_type = IFLA_PPP_DEV_FD;
++ nlreq.ifli.ifid.ifdata[0].ppp.ppp_dev_fd = ppp_dev_fd;
++
++ memset(&nladdr, 0, sizeof(nladdr));
++ nladdr.nl_family = AF_NETLINK;
++
++ memset(&iov, 0, sizeof(iov));
++ iov.iov_base = &nlreq;
++ iov.iov_len = sizeof(nlreq);
++
++ memset(&msg, 0, sizeof(msg));
++ msg.msg_name = &nladdr;
++ msg.msg_namelen = sizeof(nladdr);
++ msg.msg_iov = &iov;
++ msg.msg_iovlen = 1;
++
++ if (sendmsg(fd, &msg, 0) < 0) {
++ error("make_ppp_unit_rtnetlink: sendmsg(RTM_NEWLINK/NLM_F_CREATE): %m (line %d)", __LINE__);
++ close(fd);
++ return 0;
++ }
++
++ memset(&iov, 0, sizeof(iov));
++ iov.iov_base = &nlresp;
++ iov.iov_len = sizeof(nlresp);
++
++ memset(&msg, 0, sizeof(msg));
++ msg.msg_name = &nladdr;
++ msg.msg_namelen = sizeof(nladdr);
++ msg.msg_iov = &iov;
++ msg.msg_iovlen = 1;
++
++ nlresplen = recvmsg(fd, &msg, 0);
++
++ if (nlresplen < 0) {
++ error("make_ppp_unit_rtnetlink: recvmsg(NLM_F_ACK): %m (line %d)", __LINE__);
++ close(fd);
++ return 0;
++ }
+
+- memset(&nladdr, 0, sizeof(nladdr));
+- nladdr.nl_family = AF_NETLINK;
+-
+- if (bind(fd, (struct sockaddr *)&nladdr, sizeof(nladdr)) < 0) {
+- error("make_ppp_unit_rtnetlink: bind(AF_NETLINK): %m (line %d)", __LINE__);
+ close(fd);
+- return 0;
+- }
+-
+- memset(&nlreq, 0, sizeof(nlreq));
+- nlreq.nlh.nlmsg_len = sizeof(nlreq);
+- nlreq.nlh.nlmsg_type = RTM_NEWLINK;
+- nlreq.nlh.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | NLM_F_EXCL | NLM_F_CREATE;
+- nlreq.ifm.ifi_family = AF_UNSPEC;
+- nlreq.ifm.ifi_type = ARPHRD_NETROM;
+- nlreq.ifn.rta.rta_len = sizeof(nlreq.ifn);
+- nlreq.ifn.rta.rta_type = IFLA_IFNAME;
+- strlcpy(nlreq.ifn.ifname, req_ifname, sizeof(nlreq.ifn.ifname));
+- nlreq.ifli.rta.rta_len = sizeof(nlreq.ifli);
+- nlreq.ifli.rta.rta_type = IFLA_LINKINFO;
+- nlreq.ifli.ifik.rta.rta_len = sizeof(nlreq.ifli.ifik);
+- nlreq.ifli.ifik.rta.rta_type = IFLA_INFO_KIND;
+- strcpy(nlreq.ifli.ifik.ifkind, "ppp");
+- nlreq.ifli.ifid.rta.rta_len = sizeof(nlreq.ifli.ifid);
+- nlreq.ifli.ifid.rta.rta_type = IFLA_INFO_DATA;
+- nlreq.ifli.ifid.ifdata[0].rta.rta_len = sizeof(nlreq.ifli.ifid.ifdata[0]);
+- nlreq.ifli.ifid.ifdata[0].rta.rta_type = IFLA_PPP_DEV_FD;
+- nlreq.ifli.ifid.ifdata[0].ppp.ppp_dev_fd = ppp_dev_fd;
+-
+- memset(&nladdr, 0, sizeof(nladdr));
+- nladdr.nl_family = AF_NETLINK;
+-
+- memset(&iov, 0, sizeof(iov));
+- iov.iov_base = &nlreq;
+- iov.iov_len = sizeof(nlreq);
+-
+- memset(&msg, 0, sizeof(msg));
+- msg.msg_name = &nladdr;
+- msg.msg_namelen = sizeof(nladdr);
+- msg.msg_iov = &iov;
+- msg.msg_iovlen = 1;
+-
+- if (sendmsg(fd, &msg, 0) < 0) {
+- error("make_ppp_unit_rtnetlink: sendmsg(RTM_NEWLINK/NLM_F_CREATE): %m (line %d)", __LINE__);
+- close(fd);
+- return 0;
+- }
+-
+- memset(&iov, 0, sizeof(iov));
+- iov.iov_base = &nlresp;
+- iov.iov_len = sizeof(nlresp);
+-
+- memset(&msg, 0, sizeof(msg));
+- msg.msg_name = &nladdr;
+- msg.msg_namelen = sizeof(nladdr);
+- msg.msg_iov = &iov;
+- msg.msg_iovlen = 1;
+-
+- nlresplen = recvmsg(fd, &msg, 0);
+-
+- if (nlresplen < 0) {
+- error("make_ppp_unit_rtnetlink: recvmsg(NLM_F_ACK): %m (line %d)", __LINE__);
+- close(fd);
+- return 0;
+- }
+-
+- close(fd);
+
+- if (nladdr.nl_family != AF_NETLINK) {
+- error("make_ppp_unit_rtnetlink: recvmsg(NLM_F_ACK): Not a netlink packet (line %d)", __LINE__);
+- return 0;
+- }
+-
+- if ((size_t)nlresplen < sizeof(nlresp) || nlresp.nlh.nlmsg_len < sizeof(nlresp)) {
+- error("make_ppp_unit_rtnetlink: recvmsg(NLM_F_ACK): Acknowledgment netlink packet too short (line %d)", __LINE__);
+- return 0;
+- }
+-
+- /* acknowledgment packet for NLM_F_ACK is NLMSG_ERROR */
+- if (nlresp.nlh.nlmsg_type != NLMSG_ERROR) {
+- error("make_ppp_unit_rtnetlink: recvmsg(NLM_F_ACK): Not an acknowledgment netlink packet (line %d)", __LINE__);
+- return 0;
+- }
++ if (nladdr.nl_family != AF_NETLINK) {
++ error("make_ppp_unit_rtnetlink: recvmsg(NLM_F_ACK): Not a netlink packet (line %d)", __LINE__);
++ return 0;
++ }
++
++ if ((size_t)nlresplen < sizeof(nlresp) || nlresp.nlh.nlmsg_len < sizeof(nlresp)) {
++ error("make_ppp_unit_rtnetlink: recvmsg(NLM_F_ACK): Acknowledgment netlink packet too short (line %d)", __LINE__);
++ return 0;
++ }
++
++ /* acknowledgment packet for NLM_F_ACK is NLMSG_ERROR */
++ if (nlresp.nlh.nlmsg_type != NLMSG_ERROR) {
++ error("make_ppp_unit_rtnetlink: recvmsg(NLM_F_ACK): Not an acknowledgment netlink packet (line %d)", __LINE__);
++ return 0;
++ }
++ } while (nlresp.nlerr.error == -EBUSY);
+
+ /* error == 0 indicates success, negative value is errno code */
+ if (nlresp.nlerr.error != 0) {
--- a/pppd/main.c
+++ b/pppd/main.c
-@@ -1034,7 +1034,8 @@ get_input(void)
+@@ -1035,7 +1035,8 @@ get_input(void)
}
notice("Modem hangup");
hungup = 1;
&& memcmp(vd.dptr, key.dptr, vd.dsize) == 0;
--- a/pppd/sys-linux.c
+++ b/pppd/sys-linux.c
-@@ -706,6 +706,16 @@ void cfg_bundle(int mrru, int mtru, int
+@@ -923,6 +923,16 @@ void cfg_bundle(int mrru, int mtru, int
add_fd(ppp_dev_fd);
}
/*
* make_new_bundle - create a new PPP unit (i.e. a bundle)
* and connect our channel to it. This should only get called
-@@ -724,6 +734,8 @@ void make_new_bundle(int mrru, int mtru,
+@@ -941,6 +951,8 @@ void make_new_bundle(int mrru, int mtru,
/* set the mrru and flags */
cfg_bundle(mrru, mtru, rssn, tssn);
--- a/pppd/sys-linux.c
+++ b/pppd/sys-linux.c
-@@ -1770,6 +1770,7 @@ int cifdefaultroute (int unit, u_int32_t
+@@ -2248,6 +2248,7 @@ int cifdefaultroute (int unit, u_int32_t
SIN_ADDR(rt.rt_genmask) = 0L;
}
--- a/pppd/sys-linux.c
+++ b/pppd/sys-linux.c
-@@ -1720,6 +1720,9 @@ int sifdefaultroute (int unit, u_int32_t
+@@ -2198,6 +2198,9 @@ int sifdefaultroute (int unit, u_int32_t
memset (&rt, 0, sizeof (rt));
SET_SA_FAMILY (rt.rt_dst, AF_INET);
rt.rt_dev = ifname;
rt.rt_metric = dfl_route_metric + 1; /* +1 for binary compatibility */
-@@ -1728,7 +1731,7 @@ int sifdefaultroute (int unit, u_int32_t
+@@ -2206,7 +2209,7 @@ int sifdefaultroute (int unit, u_int32_t
SIN_ADDR(rt.rt_genmask) = 0L;
}
--- a/pppd/sys-linux.c
+++ b/pppd/sys-linux.c
-@@ -206,7 +206,7 @@ static int driver_is_old = 0;
+@@ -235,7 +235,7 @@ static int driver_is_old = 0;
static int restore_term = 0; /* 1 => we've munged the terminal */
static struct termios inittermios; /* Initial TTY termios */
static char loop_name[20];
static unsigned char inbuf[512]; /* buffer for chars read from loopback */
-@@ -225,8 +225,8 @@ static int looped; /* 1 if using loop
+@@ -254,8 +254,8 @@ static int looped; /* 1 if using loop
static int link_mtu; /* mtu for the link (not bundle) */
static struct utsname utsname; /* for the kernel version */
#define MAX_IFS 100
-@@ -1455,11 +1455,12 @@ int ccp_fatal_error (int unit)
+@@ -1933,11 +1933,12 @@ int ccp_fatal_error (int unit)
*
* path_to_procfs - find the path to the proc file system mount point
*/
struct mntent *mntent;
FILE *fp;
-@@ -1481,6 +1482,7 @@ static char *path_to_procfs(const char *
+@@ -1959,6 +1960,7 @@ static char *path_to_procfs(const char *
fclose (fp);
}
}
strlcpy(proc_path + proc_path_len, tail,
sizeof(proc_path) - proc_path_len);
-@@ -2365,15 +2367,19 @@ int ppp_available(void)
+@@ -2843,15 +2845,19 @@ int ppp_available(void)
int my_version, my_modification, my_patch;
int osmaj, osmin, ospatch;
/* XXX should get from driver */
driver_version = 2;
-@@ -2433,6 +2439,7 @@ int ppp_available(void)
+@@ -2911,6 +2917,7 @@ int ppp_available(void)
if (ok && ((ifr.ifr_hwaddr.sa_family & ~0xFF) != ARPHRD_PPP))
ok = 0;
/*
* This is the PPP device. Validate the version of the driver at this
-@@ -3106,6 +3113,7 @@ get_pty(int *master_fdp, int *slave_fdp,
+@@ -3592,6 +3599,7 @@ get_pty(int *master_fdp, int *slave_fdp,
}
#endif /* TIOCGPTN */
if (sfd < 0) {
/* the old way - scan through the pty name space */
for (i = 0; i < 64; ++i) {
-@@ -3124,6 +3132,7 @@ get_pty(int *master_fdp, int *slave_fdp,
+@@ -3610,6 +3618,7 @@ get_pty(int *master_fdp, int *slave_fdp,
}
}
}
--- a/pppd/pppd.h
+++ b/pppd/pppd.h
-@@ -317,7 +317,6 @@ extern int holdoff; /* Dead time before
+@@ -318,7 +318,6 @@ extern int holdoff; /* Dead time before
extern bool holdoff_specified; /* true if user gave a holdoff value */
extern bool notty; /* Stdin/out is not a tty */
extern char *pty_socket; /* Socket to connect to pty */
--- a/pppd/sys-linux.c
+++ b/pppd/sys-linux.c
-@@ -2503,6 +2503,7 @@ int ppp_available(void)
+@@ -2981,6 +2981,7 @@ int ppp_available(void)
void logwtmp (const char *line, const char *name, const char *host)
{
struct utmp ut, *utp;
pid_t mypid = getpid();
#if __GLIBC__ < 2
-@@ -2568,6 +2569,7 @@ void logwtmp (const char *line, const ch
+@@ -3046,6 +3047,7 @@ void logwtmp (const char *line, const ch
close (wtmp);
}
#endif
--- a/pppd/main.c
+++ b/pppd/main.c
-@@ -866,14 +866,17 @@ struct protocol_list {
+@@ -867,14 +867,17 @@ struct protocol_list {
const char *name;
} protocol_list[] = {
{ 0x21, "IP" },
{ 0x33, "Stream Protocol ST-II" },
{ 0x35, "Banyan Vines" },
{ 0x39, "AppleTalk EDDP" },
-@@ -887,8 +890,11 @@ struct protocol_list {
+@@ -888,8 +891,11 @@ struct protocol_list {
{ 0x49, "Serial Data Transport Protocol (PPP-SDTP)" },
{ 0x4b, "SNA over 802.2" },
{ 0x4d, "SNA" },
{ 0x53, "Encryption" },
{ 0x55, "Individual Link Encryption" },
{ 0x57, "IPv6" },
-@@ -899,12 +905,15 @@ struct protocol_list {
+@@ -900,12 +906,15 @@ struct protocol_list {
{ 0x65, "RTP IPHC Compressed non-TCP" },
{ 0x67, "RTP IPHC Compressed UDP 8" },
{ 0x69, "RTP IPHC Compressed RTP 8" },
{ 0x0203, "IBM Source Routing BPDU" },
{ 0x0205, "DEC LANBridge100 Spanning Tree" },
{ 0x0207, "Cisco Discovery Protocol" },
-@@ -916,15 +925,19 @@ struct protocol_list {
+@@ -917,15 +926,19 @@ struct protocol_list {
{ 0x0231, "Luxcom" },
{ 0x0233, "Sigma Network Systems" },
{ 0x0235, "Apple Client Server Protocol" },
{ 0x4001, "Cray Communications Control Protocol" },
{ 0x4003, "CDPD Mobile Network Registration Protocol" },
{ 0x4005, "Expand accelerator protocol" },
-@@ -935,8 +948,10 @@ struct protocol_list {
+@@ -936,8 +949,10 @@ struct protocol_list {
{ 0x4023, "RefTek Protocol" },
{ 0x4025, "Fibre Channel" },
{ 0x4027, "EMIT Protocols" },
{ 0x8023, "OSI Network Layer Control Protocol" },
{ 0x8025, "Xerox NS IDP Control Protocol" },
{ 0x8027, "DECnet Phase IV Control Protocol" },
-@@ -945,7 +960,9 @@ struct protocol_list {
+@@ -946,7 +961,9 @@ struct protocol_list {
{ 0x8031, "Bridging NCP" },
{ 0x8033, "Stream Protocol Control Protocol" },
{ 0x8035, "Banyan Vines Control Protocol" },
{ 0x803f, "NETBIOS Framing Control Protocol" },
{ 0x8041, "Cisco Systems Control Protocol" },
{ 0x8043, "Ascom Timeplex" },
-@@ -954,18 +971,24 @@ struct protocol_list {
+@@ -955,18 +972,24 @@ struct protocol_list {
{ 0x8049, "Serial Data Control Protocol (PPP-SDCP)" },
{ 0x804b, "SNA over 802.2 Control Protocol" },
{ 0x804d, "SNA Control Protocol" },
{ 0x8207, "Cisco Discovery Protocol Control" },
{ 0x8209, "Netcs Twin Routing" },
{ 0x820b, "STP - Control Protocol" },
-@@ -974,24 +997,29 @@ struct protocol_list {
+@@ -975,24 +998,29 @@ struct protocol_list {
{ 0x8281, "MPLSCP" },
{ 0x8285, "IEEE p1284.4 standard - Protocol Control" },
{ 0x8287, "ETSI TETRA TNP1 Control Protocol" },
projects / openwrt / staging / nbd.git / commitdiff