Add BPF dynptr TC demo implementation

- Implement BPF program for TC ingress using dynptrs to safely parse packet headers and manage variable-length ringbuf records.
- Create user-space loader for the BPF program, allowing configuration of blocked ports and snapshot lengths for TCP payloads.
- Define necessary data structures and constants in header file for both BPF and user-space contexts.
- Add a comprehensive test script to validate functionality, including basic packet capture and port blocking tests.

Author: github-actions[bot]

README.md

@@ -103,6 +103,10 @@ Features:
 - [lesson 36-userspace-ebpf](src/36-userspace-ebpf/README.md) Userspace eBPF Runtimes: Overview and Applications
 - [lesson 38-btf-uprobe](src/38-btf-uprobe/README.md) Expanding eBPF Compile Once, Run Everywhere(CO-RE) to Userspace Compatibility
 - [lesson 43-kfuncs](src/43-kfuncs/README.md) Extending eBPF Beyond Its Limits: Custom kfuncs in Kernel Modules
+- [features struct_ops](src/features/struct_ops/README.md) Extending Kernel Subsystems with BPF struct_ops
+- [features bpf_iters](src/features/bpf_iters/README.md) BPF Iterators for Kernel Data Export
+- [features dynptr](src/features/dynptr/README.md) BPF Dynamic Pointers for Variable-Length Data
+- [features bpf_arena](src/features/bpf_arena/README.md) BPF Arena for Zero-Copy Shared Memory
 - [features bpf_wq](src/features/bpf_wq/README.md) BPF Workqueues for Asynchronous Sleepable Tasks
 - [features bpf_iters](src/features/bpf_iters/README.md) BPF Iterators for Kernel Data Export
 - [features struct_ops](src/features/struct_ops/README.md) Extending Kernel Subsystems with BPF struct_ops

README.zh.md

@@ -81,6 +81,10 @@ GPU:
 - [lesson 36-userspace-ebpf](src/36-userspace-ebpf/README.zh.md) 用户空间 eBPF 运行时：深度解析与应用实践
 - [lesson 38-btf-uprobe](src/38-btf-uprobe/README.zh.md) 借助 eBPF 和 BTF，让用户态也能一次编译、到处运行
 - [lesson 43-kfuncs](src/43-kfuncs/README.zh.md) 超越 eBPF 的极限：在内核模块中定义自定义 kfunc
+- [features struct_ops](src/features/struct_ops/README.zh.md) eBPF 教程：使用 BPF struct_ops 扩展内核子系统
+- [features bpf_iters](src/features/bpf_iters/README.zh.md) eBPF 教程：BPF 迭代器用于内核数据导出
+- [features dynptr](src/features/dynptr/README.zh.md) BPF Dynamic Pointers for Variable-Length Data
+- [features bpf_arena](src/features/bpf_arena/README.zh.md) eBPF 实例教程：BPF Arena 零拷贝共享内存
 - [features bpf_wq](src/features/bpf_wq/README.zh.md) eBPF 教程：BPF 工作队列用于异步可睡眠任务
 - [features bpf_iters](src/features/bpf_iters/README.zh.md) eBPF 教程：BPF 迭代器用于内核数据导出
 - [features struct_ops](src/features/struct_ops/README.zh.md) eBPF 教程：使用 BPF struct_ops 扩展内核子系统

src/SUMMARY.md

@@ -94,6 +94,10 @@ Features:
 - [lesson 36-userspace-ebpf](36-userspace-ebpf/README.md) Userspace eBPF Runtimes: Overview and Applications
 - [lesson 38-btf-uprobe](38-btf-uprobe/README.md) Expanding eBPF Compile Once, Run Everywhere(CO-RE) to Userspace Compatibility
 - [lesson 43-kfuncs](43-kfuncs/README.md) Extending eBPF Beyond Its Limits: Custom kfuncs in Kernel Modules
+- [features struct_ops](features/struct_ops/README.md) Extending Kernel Subsystems with BPF struct_ops
+- [features bpf_iters](features/bpf_iters/README.md) BPF Iterators for Kernel Data Export
+- [features dynptr](features/dynptr/README.md) BPF Dynamic Pointers for Variable-Length Data
+- [features bpf_arena](features/bpf_arena/README.md) BPF Arena for Zero-Copy Shared Memory
 - [features bpf_wq](features/bpf_wq/README.md) BPF Workqueues for Asynchronous Sleepable Tasks
 - [features bpf_iters](features/bpf_iters/README.md) BPF Iterators for Kernel Data Export
 - [features struct_ops](features/struct_ops/README.md) Extending Kernel Subsystems with BPF struct_ops

src/SUMMARY.zh.md

@@ -73,6 +73,10 @@ GPU:
 - [lesson 36-userspace-ebpf](36-userspace-ebpf/README.zh.md) 用户空间 eBPF 运行时：深度解析与应用实践
 - [lesson 38-btf-uprobe](38-btf-uprobe/README.zh.md) 借助 eBPF 和 BTF，让用户态也能一次编译、到处运行
 - [lesson 43-kfuncs](43-kfuncs/README.zh.md) 超越 eBPF 的极限：在内核模块中定义自定义 kfunc
+- [features struct_ops](features/struct_ops/README.zh.md) eBPF 教程：使用 BPF struct_ops 扩展内核子系统
+- [features bpf_iters](features/bpf_iters/README.zh.md) eBPF 教程：BPF 迭代器用于内核数据导出
+- [features dynptr](features/dynptr/README.zh.md) BPF Dynamic Pointers for Variable-Length Data
+- [features bpf_arena](features/bpf_arena/README.zh.md) eBPF 实例教程：BPF Arena 零拷贝共享内存
 - [features bpf_wq](features/bpf_wq/README.zh.md) eBPF 教程：BPF 工作队列用于异步可睡眠任务
 - [features bpf_iters](features/bpf_iters/README.zh.md) eBPF 教程：BPF 迭代器用于内核数据导出
 - [features struct_ops](features/struct_ops/README.zh.md) eBPF 教程：使用 BPF struct_ops 扩展内核子系统