Add support for raw + af_packet sockets

[danielinux]

Add support for raw sockets and packet sockets.

• Added support for BSD wrapper in posix systems.
• Added 'raw_ping' and 'packet_ping' examples to craft ICMP echo requests / receive replies using the new sockets
• Added automated tests to github workflow

Superseeds #10

[Copilot]

Pull request overview

Adds raw IP socket and AF_PACKET-style packet socket support to wolfIP, including POSIX preload shim enhancements and new example utilities for pinging via the new socket types.

Changes:

• Add RAW and PACKET socket types to the wolfIP socket API, including send/recv/bind/connect/poll support.
• Extend the POSIX LD_PRELOAD BSD socket shim with ioctl() handling for interface/ARP queries needed by packet sockets.
• Add new raw_ping / packet_ping examples and run them in CI.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
wolfip.h	Adds socket constants, socket marks, and sockaddr_ll support plus ARP lookup API.
src/wolfip.c	Implements raw sockets + packet sockets, routing/ARP for raw TX, and capture paths for RX.
src/test/unit/unit.c	Adds unit tests covering raw/packet socket send/recv behaviors.
src/test/raw_ping.c	New raw-socket ping example for CI/manual testing.
src/test/packet_ping.c	New AF_PACKET ping example using ioctl-derived interface info.
src/port/posix/bsd_socket.c	Adds ioctl() interception and fd bookkeeping for raw/packet sockets.
config.h	Enables raw/packet sockets by default and sets default max counts.
Makefile	Builds the new ping example binaries.
.github/workflows/linux.yml	Runs raw_ping and packet_ping under LD_PRELOAD in CI.

Comments suppressed due to low confidence (2)

src/test/raw_ping.c:55

• The checksum helper handles odd-length buffers incorrectly: for a trailing byte it should be added as the high-order byte of the final 16-bit word (i.e., byte << 8, zero-padded), not as a low-order byte. This matches how Internet checksums are computed (and how the stack’s checksum helpers handle odd lengths).

    if (len == 1) {
        sum += *(unsigned char *)buf;
    }

src/test/packet_ping.c:99

• The checksum helper adds the trailing byte for odd-length buffers without shifting it into the high-order position of the final 16-bit word. For correctness with arbitrary payload sizes, treat the last byte as byte << 8 (zero-padded) when len is odd.

    if (len == 1) {
        sum += *(unsigned char *)buf;
    }

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[Copilot]

Pull request overview

Copilot reviewed 9 out of 9 changed files in this pull request and generated 3 comments.

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[Copilot]

Pull request overview

Copilot reviewed 9 out of 9 changed files in this pull request and generated 4 comments.

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[Copilot]

Pull request overview

Copilot reviewed 9 out of 9 changed files in this pull request and generated 10 comments.

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[Copilot]

Pull request overview

Copilot reviewed 11 out of 11 changed files in this pull request and generated 7 comments.

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[Copilot]

Pull request overview

Copilot reviewed 11 out of 11 changed files in this pull request and generated 4 comments.

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[Copilot]

Pull request overview

Copilot reviewed 11 out of 11 changed files in this pull request and generated 10 comments.

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[wolfSSL-Fenrir-bot]

Fenrir Automated Review — PR #63

Scan targets checked: wolfip-bugs, wolfip-compliance, wolfip-defaults, wolfip-mutation, wolfip-proptest, wolfip-src

Findings: 4
4 finding(s) posted as inline comments (see file-level comments below)

This review was generated automatically by Fenrir. Findings are non-blocking.

[Copilot]

Pull request overview

Copilot reviewed 11 out of 11 changed files in this pull request and generated 8 comments.

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