network revision

1 files changed, 86 insertions, 41 deletions

diff --git a/tools/qemu.html b/tools/qemu.html
index 0079dfc..86fb7aa 100644
--- a/tools/qemu.html
+++ b/tools/qemu.html
@@ -12,7 +12,9 @@
 
         <h2 id="kern">1. Host System</h2>
 
-        <p>Load modules, in this case kvm of intel cpu;</p>
+        <p>Prepare host system for virtual machines, this includes create new user,
+        loading necessary modules and configure network. Load kvm module, in this example
+        intel module is loaded but depends on host cpu;</p>
 
         <pre>
         # modprobe -a kvm-intel tun virtio
@@ -27,6 +29,7 @@
 
         <h2 id="disk">2. Disk images</h2>
 
+        <p>Qemu supports multiple disk images types.</p>
         <dl>
             <dt>img</dt>
             <dd>Raw disk image, allows dd to a physical device.</dd>
@@ -115,67 +118,109 @@
         KERNEL=="tun", GROUP="kvm", MODE="0660", OPTIONS+="static_node=net/tun"
         </pre>
 
+        <h3>2.1. Routing</h3>
 
-        <h3>2.1. Public Bridge</h3>
-
-        <p>Create <a href="network.html#bridge">bridge</a>, create new
-        tap and add it to bridge;</p>
-
-        <pre>
-        # DEV="br0"
-        # TAP="tap1"
-        </pre>
-
-        <pre>
-        # ip tuntap add ${TAP} mode tap group kvm
-        # ip link set ${TAP} up
-        </pre>
+        <p>Create interface with correct permissions set for kvm group.</p>
 
         <pre>
-        # ip link set ${TAP} master ${DEV}
+        # sysctl -w net.ipv4.ip_forward=1
+        # iptables -A INPUT -i br0 -j ACCEPT
+        # iptables -A FORWARD -i br0 -j ACCEPT
+        # iptables -t nat -A POSTROUTING -s 10.0.0.0/24 -d 10.0.0.0/24 -j ACCEPT
+        # iptables -t nat -A POSTROUTING -s 10.0.0.0/24 -j MASQUERADE
         </pre>
 
-        <h3>2.2. Routing</h3>
+        <h3>2.2. Public Bridge</h3>
 
-        <p>Create interface with correct permissions set for kvm group.</p>
+        <p>Create <a href="network.html#bridge">bridge</a>, create new
+        tap and add it to bridge;</p>
 
         <pre>
-        # sysctl -w net.ipv4.ip_forward=1
-        # iptables -t nat -A POSTROUTING -s 10.0.0.0/24 -o eth0 -j MASQUERADE
+        DEV="br0"
+
+        ADDR=10.0.0.254
+        NET=10.0.0.0
+        GW=192.168.1.254
+        MASK=24
+
+        # one tap for each cpu core
+        NTAPS=$((`/usr/bin/nproc`))
+
+        case $1 in
+            start)
+                /sbin/ip link add name ${DEV} type bridge
+                /sbin/ip addr add ${ADDR}/${MASK} dev ${DEV} broadcast +
+                /sbin/ip link set dev ${DEV} up
+                /bin/sleep 0.2s
+
+                for i in `/usr/bin/seq $NTAPS`
+                do
+                    TAP="tap$i"
+                    echo "Setting up ${TAP} tap interface."
+                    /sbin/ip tuntap add ${TAP} mode tap group kvm
+                    /sbin/ip link set ${TAP} up
+                    /bin/sleep 0.2s
+                    /sbin/ip link set ${TAP} master ${DEV}
+                done
+
+                exit 0
+                ;;
+            stop)
+
+                for i in `/usr/bin/seq $NTAPS`
+                do
+                    TAP="tap$i"
+                    echo "Deleting ${TAP} tap interface."
+                    /sbin/ip link del ${TAP}
+                done
+
+                /sbin/ip link set dev ${DEV} down
+                /sbin/ip route flush dev ${DEV}
+                /sbin/ip link del ${DEV}
+                exit 0
+                ;;
+            restart)
+                $0 stop
+                $0 start
+                ;;
+            *)
+                echo "Usage: $0 [start|stop|restart]"
+                ;;
+        esac
+
+        # End of file
         </pre>
 
         <h2 id="guest">Guest System</h2>
 
-        <p>Start qemu with 512 of ram, mydisk.img as disk and boot from iso</p>
-
         <p>See <a href="scripts/system-qemu.sh">scripts/system-qemu.sh</a>,
         as template. Run virtual machine that uses above tap device;</p>
 
         <pre>
-        $ ISO=~/crux-3.2.iso
-        $ IMG=~/crux-img.qcow2
-        $ TAP="tap1"
+        #!/bin/bash
 
-        $ qemu-system-x86_64 \
-            -enable-kvm \
-            -m 1024 \
-            -boot d \
-            -cdrom ${ISO} \
-            -hda ${IMG} \
-            -net nic,model=virtio -net tap,ifname=${TAP},script=no,downscript=no
-        </pre>
+        function rmac_addr (){
+        printf '54:60:BE:EF:%02X:%02X\n' $((RANDOM%256)) $((RANDOM%256))
+        }
 
-        <pre>
-        $ ISO=~/crux-3.2.iso
-        $ IMG=~/crux-img.qcow2
+        #boot=d
+        boot=$1
+        #iso=crux-3.2.iso
+        iso=$2
+        #image=crux-img.qcow2
+        image=$3
+        #tap="tap1"
+        tap=$4
+        mac=$(rmac_addr)
 
-        $ qemu-system-x86_64 \
+        qemu-system-x86_64 \
             -enable-kvm \
             -m 1024 \
-            -boot d \
-            -cdrom ${ISO} \
-            -hda ${IMG} \
-            -net nic,model=virtio -net tap,ifname=${TAP},script=no,downscript=no
+            -boot ${boot} \
+            -cdrom ${iso} \
+            -hda ${image} \
+            -device e1000,netdev=t0,mac=${mac} \
+            -netdev tap,id=t0,ifname=${tap},script=no,downscript=no
         </pre>
 
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