Update install script.

README.md

@@ -59,6 +59,7 @@ Additionally, here is a list of flags you may pass to this script.
 | --no-install | Build the tool and/or LibXDP without installing them. |
 | --clean | Remove build files for the tool and LibXDP. |
 | --no-static | Do *not* statically link LibXDP and LibBPF object files when building the tool. This makes the build process faster, but you may need to alter your `LD_LIBRARY_PATH` env variable before running the tool and requires LibXDP to be installed on your system already. |
+| --objdump | Dumps the XDP/BPF object file using [`llvm-objdump`](https://llvm.org/docs/CommandGuide/llvm-objdump.html) to Assemby into `objdump.asm`. |
 | --help | Displays help message. |
 
 ![Script Build Demo](./images/build_script.gif)

install.sh

@@ -2,6 +2,8 @@
 LIBXDP=0
 INSTALL=1
 CLEAN=0
+OBJDUMP=0
+HELP=0
 STATIC=1
 
 while [[ $# -gt 0 ]]; do
@@ -32,17 +34,14 @@ while [[ $# -gt 0 ]]; do
             shift
             ;;
 
-        --help)
+        --objdump)
-            echo "Usage: install.sh [OPTIONS]"
+            OBJDUMP=1
-            echo
-            echo "Options:"
-            echo "  --libxdp       Build and install LibXDP before building the tool."
-            echo "  --no-install   Build the tool and/or LibXDP without installing them."
-            echo "  --clean        Remove build files for the tool and LibXDP."
-            echo "  --no-static    Do not statically link LibXDP and LibBPF object files when building the tool and rely on shared libraries (-lbpf and -lxdp flags)."
-            echo "  --help         Display this help message."
 
-            exit 0
+            shift
+            ;;
+
+        --help)
+            HELP=1
 
             shift
             ;;
@@ -53,6 +52,20 @@ while [[ $# -gt 0 ]]; do
         esac
 done
 
+if [ "$HELP" -gt 0 ]; then
+    echo "Usage: install.sh [OPTIONS]"
+    echo
+    echo "Options:"
+    echo "  --libxdp       Build and install LibXDP before building the tool."
+    echo "  --no-install   Build the tool and/or LibXDP without installing them."
+    echo "  --clean        Remove build files for the tool and LibXDP."
+    echo "  --no-static    Do not statically link LibXDP and LibBPF object files when building the tool and rely on shared libraries (-lbpf and -lxdp flags)."
+    echo "  --objdump     Dumps the XDP/BPF object file using 'llvm-objdump' to Assemby into 'objdump.asm'."
+    echo "  --help         Display this help message."
+
+    exit 0
+fi
+
 if [ "$CLEAN" -gt 0 ]; then
     if [ "$LIBXDP" -gt 0 ]; then
         echo "Cleaning LibXDP..."
@@ -67,6 +80,14 @@ if [ "$CLEAN" -gt 0 ]; then
     exit 0
 fi
 
+if [ "$OBJDUMP" -gt 0 ]; then
+    echo "Dumping object file..."
+
+    ./scripts/objdump.sh
+
+    exit 0
+fi
+
 if [ "$LIBXDP" -gt 0 ]; then
     echo "Building LibXDP..."
 

src/xdp/prog.c

@@ -55,7 +55,7 @@ int xdp_prog_main(struct xdp_md *ctx)
     // Set IPv4 and IPv6 common variables.
     if (eth->h_proto == htons(ETH_P_IPV6))
     {
-        iph6 = (data + sizeof(struct ethhdr));
+        iph6 = data + sizeof(struct ethhdr);
 
         if (unlikely(iph6 + 1 > (struct ipv6hdr *)data_end))
         {
@@ -66,7 +66,7 @@ int xdp_prog_main(struct xdp_md *ctx)
     }
     else
     {
-        iph = (data + sizeof(struct ethhdr));
+        iph = data + sizeof(struct ethhdr);
 
         if (unlikely(iph + 1 > (struct iphdr *)data_end))
         {
@@ -152,7 +152,7 @@ int xdp_prog_main(struct xdp_md *ctx)
         {
             case IPPROTO_TCP:
                 // Scan TCP header.
-                tcph = (data + sizeof(struct ethhdr) + sizeof(struct ipv6hdr));
+                tcph = data + sizeof(struct ethhdr) + sizeof(struct ipv6hdr);
 
                 // Check TCP header.
                 if (unlikely(tcph + 1 > (struct tcphdr *)data_end))
@@ -170,7 +170,7 @@ int xdp_prog_main(struct xdp_md *ctx)
 
             case IPPROTO_UDP:
                 // Scan UDP header.
-                udph = (data + sizeof(struct ethhdr) + sizeof(struct ipv6hdr));
+                udph = data + sizeof(struct ethhdr) + sizeof(struct ipv6hdr);
 
                 // Check TCP header.
                 if (unlikely(udph + 1 > (struct udphdr *)data_end))
@@ -188,7 +188,7 @@ int xdp_prog_main(struct xdp_md *ctx)
 
             case IPPROTO_ICMPV6:
                 // Scan ICMPv6 header.
-                icmp6h = (data + sizeof(struct ethhdr) + sizeof(struct ipv6hdr));
+                icmp6h = data + sizeof(struct ethhdr) + sizeof(struct ipv6hdr);
 
                 // Check ICMPv6 header.
                 if (unlikely(icmp6h + 1 > (struct icmp6hdr *)data_end))
@@ -207,7 +207,7 @@ int xdp_prog_main(struct xdp_md *ctx)
         {
             case IPPROTO_TCP:
                 // Scan TCP header.
-                tcph = (data + sizeof(struct ethhdr) + (iph->ihl * 4));
+                tcph = data + sizeof(struct ethhdr) + (iph->ihl * 4);
 
                 // Check TCP header.
                 if (unlikely(tcph + 1 > (struct tcphdr *)data_end))
@@ -225,7 +225,7 @@ int xdp_prog_main(struct xdp_md *ctx)
 
             case IPPROTO_UDP:
                 // Scan UDP header.
-                udph = (data + sizeof(struct ethhdr) + (iph->ihl * 4));
+                udph = data + sizeof(struct ethhdr) + (iph->ihl * 4);
 
                 // Check TCP header.
                 if (unlikely(udph + 1 > (struct udphdr *)data_end))
@@ -243,7 +243,7 @@ int xdp_prog_main(struct xdp_md *ctx)
 
             case IPPROTO_ICMP:
                 // Scan ICMP header.
-                icmph = (data + sizeof(struct ethhdr) + (iph->ihl * 4));
+                icmph = data + sizeof(struct ethhdr) + (iph->ihl * 4);
 
                 // Check ICMP header.
                 if (unlikely(icmph + 1 > (struct icmphdr *)data_end))