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Refer:Linux Kernel Source: net/ipv4/af_inet.c 
Linux Kernel Source: include/uapi/linux/in.h Linux Kernel Source: struct proto udp_prot Linux Kernel Source: struct proto tcp_prot
Refer:Linux Kernel Source: net/ipv4/af_inet.c
You can check fragmented packets as suggested in the video by tapping RX path in net/core/dev.c – __netif_receive_skb_core() API as shown below from the Kernel-source version 6.5.9:
https://youtu.be/z4Any08ImcQ
https://youtu.be/1zE2GJw7AbA
Refer:Linux Kernel Map picture/banner Socket Buffer Functions
Refer:skb_clone() – duplicate an sk_buff skb_copy() – create private copy of an sk_buff Here is the copy paste of skb_clone() and skb_copy() APIs (/net/core/skbuff.c) from the Kernel-source version 6.5.9…
https://youtu.be/0elOirGA_5g
Refer:skb_headroom() – bytes at buffer head skb_tailroom() – bytes at buffer end Here is the copy paste of skb_headroom() and skb_tailroom() APIs (/include/linux/skbuff.h) from the Kernel-source version 6.5.8 for…
Refer:skb_put() – add data to a buffer Here is the copy paste of skb_put() API (/net/core/skbuff.c) from the Kernel-source version 6.5.8 for quick reference:
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