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Commit e6f80149 authored by JP Abgrall's avatar JP Abgrall
Browse files

NetlinkEvents: adding support for iptables' quota2 NFLOG messages. 

It passes the quota2 name and the device at the time the quota was
reached.
  ALERT_NAME=...
  INTERFACE=...

This needs the new kernel in which xt_quota2 can log.

Change-Id: Icf5045374e1e33bdd1da0d2a2c183e70903a1fea
parent 2210a837

libsysutils/src/NetlinkEvent.cpp

+54 −25
Original line number Diff line number Diff line
@@ -23,8 +23,14 @@ 


#include <sys/types.h>

#include <sys/socket.h>

#include <linux/rtnetlink.h>

#include <linux/if.h>

#include <linux/netfilter/nfnetlink.h>

#include <linux/netfilter_ipv4/ipt_ULOG.h>

/* From kernel's net/netfilter/xt_quota2.c */

const int QLOG_NL_EVENT  = 112;



#include <linux/netlink.h>

#include <linux/rtnetlink.h>



const int NetlinkEvent::NlActionUnknown = 0;

const int NetlinkEvent::NlActionAdd = 1;
@@ -71,14 +77,21 @@ bool NetlinkEvent::parseBinaryNetlinkMessage(char *buffer, int size) { 
    const struct nlmsghdr *nh = (struct nlmsghdr *) buffer;



    while (NLMSG_OK(nh, sz) && (nh->nlmsg_type != NLMSG_DONE)) {



        if (nh->nlmsg_type == RTM_NEWLINK) {

            int len = nh->nlmsg_len - sizeof(*nh);

            struct ifinfomsg *ifi;



            if (sizeof(*ifi) <= (size_t) len) {

            if (sizeof(*ifi) > (size_t) len) {

                SLOGE("Got a short RTM_NEWLINK message\n");

                continue;

            }



            ifi = (ifinfomsg *)NLMSG_DATA(nh);

            if ((ifi->ifi_flags & IFF_LOOPBACK) != 0) {

                continue;

            }



                if ((ifi->ifi_flags & IFF_LOOPBACK) == 0) {

            struct rtattr *rta = (struct rtattr *)

              ((char *) ifi + NLMSG_ALIGN(sizeof(*ifi)));

            len = NLMSG_PAYLOAD(nh, sizeof(*ifi));
@@ -98,10 +111,26 @@ bool NetlinkEvent::parseBinaryNetlinkMessage(char *buffer, int size) { 


                rta = RTA_NEXT(rta, len);

            }

                }

            }

        }



        } else if (nh->nlmsg_type == QLOG_NL_EVENT) {

            char *devname;

            ulog_packet_msg_t *pm;

            size_t len = nh->nlmsg_len - sizeof(*nh);

            if (sizeof(*pm) > len) {

                SLOGE("Got a short QLOG message\n");

                continue;

            }

            pm = (ulog_packet_msg_t *)NLMSG_DATA(nh);

            devname = pm->indev_name[0] ? pm->indev_name : pm->outdev_name;

            SLOGD("QLOG prefix=%s dev=%s\n", pm->prefix, devname);

            asprintf(&mParams[0], "ALERT_NAME=%s", pm->prefix);

            asprintf(&mParams[1], "INTERFACE=%s", devname);

            mSubsystem = strdup("qlog");

            mAction = NlActionChange;



        } else {

                SLOGD("Unexpected netlink message. type=0x%x\n", nh->nlmsg_type);

        }

        nh = NLMSG_NEXT(nh, size);

    }