Which ephemeral ports are used with raw sockets

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Referring to How source ports get assigned, I do know, how the local port is determined. (=> Random free ephemeral port).



However, why does my raw socket using socket(AF_INET, SOCK_RAW, IPPROTO_TCP) get port 6 assigned?



ss -lnp shows: tcp UNCONN 0 0 0.0.0.0:6 0.0.0.0:* users:(("exe",pid=13164,fd=5))



Do I create the socket incorrectly (because IPPROTO_TCP is defined with =6 in linux/in.h)? Or are RAW_SOCKETS defaulted to port 6 if available?



I am Using Ubuntu 4.15 if that's important.






networking kernel port







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  • Raw sockets are not port specific, but protocol specific (they can be used to implement new IP protocols in user space) so I strongly suspect the protocol is encoded in what ss shows as the port. It's easy to test: Use a different protocol (including unassigned numbers) and have a look at what ss shows. Or use nc etc. to send a few TCP packets to/from unrelated ports and see if you receive them.
    – dirkt
    Sep 19 at 11:15










  • If I understood correctly, the 6 in ss just seem to tell me, that I used IPPROTO_TCP... yes. Using socket(AF_INET, SOCK_RAW, 123) ss outputs ??? UNCONN 0 0 0.0.0.0:123 0.0.0.0:* users:(("exe",pid=10039,fd=3)) so it makes sense. I'll write this as an answer.
    – Joel
    Sep 19 at 11:25














up vote
0
down vote

favorite












Referring to How source ports get assigned, I do know, how the local port is determined. (=> Random free ephemeral port).



However, why does my raw socket using socket(AF_INET, SOCK_RAW, IPPROTO_TCP) get port 6 assigned?



ss -lnp shows: tcp UNCONN 0 0 0.0.0.0:6 0.0.0.0:* users:(("exe",pid=13164,fd=5))



Do I create the socket incorrectly (because IPPROTO_TCP is defined with =6 in linux/in.h)? Or are RAW_SOCKETS defaulted to port 6 if available?



I am Using Ubuntu 4.15 if that's important.






networking kernel port







share|improve this question





















  • Raw sockets are not port specific, but protocol specific (they can be used to implement new IP protocols in user space) so I strongly suspect the protocol is encoded in what ss shows as the port. It's easy to test: Use a different protocol (including unassigned numbers) and have a look at what ss shows. Or use nc etc. to send a few TCP packets to/from unrelated ports and see if you receive them.
    – dirkt
    Sep 19 at 11:15










  • If I understood correctly, the 6 in ss just seem to tell me, that I used IPPROTO_TCP... yes. Using socket(AF_INET, SOCK_RAW, 123) ss outputs ??? UNCONN 0 0 0.0.0.0:123 0.0.0.0:* users:(("exe",pid=10039,fd=3)) so it makes sense. I'll write this as an answer.
    – Joel
    Sep 19 at 11:25












up vote
0
down vote

favorite









up vote
0
down vote

favorite











Referring to How source ports get assigned, I do know, how the local port is determined. (=> Random free ephemeral port).



However, why does my raw socket using socket(AF_INET, SOCK_RAW, IPPROTO_TCP) get port 6 assigned?



ss -lnp shows: tcp UNCONN 0 0 0.0.0.0:6 0.0.0.0:* users:(("exe",pid=13164,fd=5))



Do I create the socket incorrectly (because IPPROTO_TCP is defined with =6 in linux/in.h)? Or are RAW_SOCKETS defaulted to port 6 if available?



I am Using Ubuntu 4.15 if that's important.






networking kernel port







share|improve this question













Referring to How source ports get assigned, I do know, how the local port is determined. (=> Random free ephemeral port).



However, why does my raw socket using socket(AF_INET, SOCK_RAW, IPPROTO_TCP) get port 6 assigned?



ss -lnp shows: tcp UNCONN 0 0 0.0.0.0:6 0.0.0.0:* users:(("exe",pid=13164,fd=5))



Do I create the socket incorrectly (because IPPROTO_TCP is defined with =6 in linux/in.h)? Or are RAW_SOCKETS defaulted to port 6 if available?



I am Using Ubuntu 4.15 if that's important.






networking kernel port




networking kernel port






share|improve this question













share|improve this question











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asked Sep 19 at 11:02









Joel

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1216











  • Raw sockets are not port specific, but protocol specific (they can be used to implement new IP protocols in user space) so I strongly suspect the protocol is encoded in what ss shows as the port. It's easy to test: Use a different protocol (including unassigned numbers) and have a look at what ss shows. Or use nc etc. to send a few TCP packets to/from unrelated ports and see if you receive them.
    – dirkt
    Sep 19 at 11:15










  • If I understood correctly, the 6 in ss just seem to tell me, that I used IPPROTO_TCP... yes. Using socket(AF_INET, SOCK_RAW, 123) ss outputs ??? UNCONN 0 0 0.0.0.0:123 0.0.0.0:* users:(("exe",pid=10039,fd=3)) so it makes sense. I'll write this as an answer.
    – Joel
    Sep 19 at 11:25
















  • Raw sockets are not port specific, but protocol specific (they can be used to implement new IP protocols in user space) so I strongly suspect the protocol is encoded in what ss shows as the port. It's easy to test: Use a different protocol (including unassigned numbers) and have a look at what ss shows. Or use nc etc. to send a few TCP packets to/from unrelated ports and see if you receive them.
    – dirkt
    Sep 19 at 11:15










  • If I understood correctly, the 6 in ss just seem to tell me, that I used IPPROTO_TCP... yes. Using socket(AF_INET, SOCK_RAW, 123) ss outputs ??? UNCONN 0 0 0.0.0.0:123 0.0.0.0:* users:(("exe",pid=10039,fd=3)) so it makes sense. I'll write this as an answer.
    – Joel
    Sep 19 at 11:25















Raw sockets are not port specific, but protocol specific (they can be used to implement new IP protocols in user space) so I strongly suspect the protocol is encoded in what ss shows as the port. It's easy to test: Use a different protocol (including unassigned numbers) and have a look at what ss shows. Or use nc etc. to send a few TCP packets to/from unrelated ports and see if you receive them.
– dirkt
Sep 19 at 11:15




Raw sockets are not port specific, but protocol specific (they can be used to implement new IP protocols in user space) so I strongly suspect the protocol is encoded in what ss shows as the port. It's easy to test: Use a different protocol (including unassigned numbers) and have a look at what ss shows. Or use nc etc. to send a few TCP packets to/from unrelated ports and see if you receive them.
– dirkt
Sep 19 at 11:15












If I understood correctly, the 6 in ss just seem to tell me, that I used IPPROTO_TCP... yes. Using socket(AF_INET, SOCK_RAW, 123) ss outputs ??? UNCONN 0 0 0.0.0.0:123 0.0.0.0:* users:(("exe",pid=10039,fd=3)) so it makes sense. I'll write this as an answer.
– Joel
Sep 19 at 11:25




If I understood correctly, the 6 in ss just seem to tell me, that I used IPPROTO_TCP... yes. Using socket(AF_INET, SOCK_RAW, 123) ss outputs ??? UNCONN 0 0 0.0.0.0:123 0.0.0.0:* users:(("exe",pid=10039,fd=3)) so it makes sense. I'll write this as an answer.
– Joel
Sep 19 at 11:25










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As @dirkt commented, the socket is not-port bound and displays the protocol aftert the local IP instead of the port (which is not there obviously).



using socket(AF_INET, SOCK_RAW, 123), ss outputs ??? UNCONN 0 0 0.0.0.0:123 0.0.0.0:* users:(("exe",pid=10039,fd=3))



Also, testing with other numbers as the third argument to socket(), ss shows that as the local port.






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    up vote
    1
    down vote



    accepted










    As @dirkt commented, the socket is not-port bound and displays the protocol aftert the local IP instead of the port (which is not there obviously).



    using socket(AF_INET, SOCK_RAW, 123), ss outputs ??? UNCONN 0 0 0.0.0.0:123 0.0.0.0:* users:(("exe",pid=10039,fd=3))



    Also, testing with other numbers as the third argument to socket(), ss shows that as the local port.






    share|improve this answer
























      up vote
      1
      down vote



      accepted










      As @dirkt commented, the socket is not-port bound and displays the protocol aftert the local IP instead of the port (which is not there obviously).



      using socket(AF_INET, SOCK_RAW, 123), ss outputs ??? UNCONN 0 0 0.0.0.0:123 0.0.0.0:* users:(("exe",pid=10039,fd=3))



      Also, testing with other numbers as the third argument to socket(), ss shows that as the local port.






      share|improve this answer






















        up vote
        1
        down vote



        accepted







        up vote
        1
        down vote



        accepted






        As @dirkt commented, the socket is not-port bound and displays the protocol aftert the local IP instead of the port (which is not there obviously).



        using socket(AF_INET, SOCK_RAW, 123), ss outputs ??? UNCONN 0 0 0.0.0.0:123 0.0.0.0:* users:(("exe",pid=10039,fd=3))



        Also, testing with other numbers as the third argument to socket(), ss shows that as the local port.






        share|improve this answer












        As @dirkt commented, the socket is not-port bound and displays the protocol aftert the local IP instead of the port (which is not there obviously).



        using socket(AF_INET, SOCK_RAW, 123), ss outputs ??? UNCONN 0 0 0.0.0.0:123 0.0.0.0:* users:(("exe",pid=10039,fd=3))



        Also, testing with other numbers as the third argument to socket(), ss shows that as the local port.







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Sep 19 at 11:29









        Joel

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