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15-441 Project 2 Fall 04

15-441 Project 2 Fall 04. pratyus@cs akannan@andrew. Project 2. 2a - Implement IP forwarding in the simulator 2b - Implement Routing Daemon. Project Directory. $PDIR = /afs/cs.cmu.edu/academic/class/15441-f04/project2 Read the README Dir structure handouts lib template utils include.

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15-441 Project 2 Fall 04

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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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