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Implement IP Forwarding in Simulator: Project 2

Learn to implement IP forwarding and routing daemon in the simulator as per project specifications. Read README for details on directory and structure. Handle network layer tasks including addressing, IPv4, forwarding, and more.

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Implement IP Forwarding in Simulator: Project 2

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  1. 15-441 Project 2Fall 04 pratyus@cs akannan@andrew

  2. Project 2 • 2a -Implement IP forwarding in the simulator • 2b - Implement Routing Daemon

  3. Project Directory • $PDIR = /afs/cs.cmu.edu/academic/class/15441-f04/project2 • Read the README • Dir structure • handouts • lib • template • utils • include

  4. Logical View of Simulator

  5. Reality

  6. To Do

  7. Network Layer • Addressing • IPv4 (RFC 791) • Forwarding • Exact match of destination IP in forwarding table • Statically populate forwarding table (proj 2a)

  8. Forwarding table • $PDIR/template/kernel/rtable.h • struct route_entry {}; • add • del • change • lookup

  9. IP header • Your implementation need not handle • Fragmentation • Options • Multicast/broadcast • ToS • You must handle • Checksum • Header length • Packet length • Src and destn address • Protocol number • TTL • IP version number

  10. ipforward.h • $PDIR/template/kernel/ipforward.h • void ip_init(); • int ip_output(struct pbuf *pkt, int flags, u_char proto, struct in_addr saddr, struct in_addr daddr); • void ip_if_input(struct ifnet *ifp, char *data, int datalen); • void ip_input(struct ifnet *ifp, struct pbuf *pkt); • void ip_input(struct ifnet *ifp, struct pbuf *pkt);

  11. pbuf • $PDIR/include/pbuf.h • Simulator handout (Section 4.5)

  12. Sending a Packet

  13. Receiving a Packet

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