Messages in this thread |  | | Date | Wed, 20 Oct 2021 16:34:18 +0000 | From | Sargun Dhillon <> | Subject | Re: Retrieving the network namespace of a socket |
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On Wed, Oct 20, 2021 at 05:03:56PM +0300, Sergey Ryazanov wrote: > Hello Sargun, > > On Wed, Oct 20, 2021 at 12:57 PM Sargun Dhillon <sargun@sargun.me> wrote: > > I'm working on a problem where I need to determine which network namespace a > > given socket is in. I can currently bruteforce this by using INET_DIAG, and > > enumerating namespaces and working backwards. > > Namespace is not a per-socket, but a per-process attribute. So each > socket of a process belongs to the same namespace. > > Could you elaborate what kind of problem you are trying to solve? > Maybe there is a more simple solution. for it. > > -- > Sergey
That's not entirely true. See the folowing code:
int main() { int fd1, fd2; fd1 = socket(AF_INET, SOCK_STREAM, 0); assert(fd1 >= 0); assert(unshare(CLONE_NEWNET) == 0); fd2 = socket(AF_INET, SOCK_STREAM, 0); assert(fd2 >= 0); }
fd1 and fd2 have different sock_net.
The context for this is: https://linuxplumbersconf.org/event/11/contributions/932/
We need to figure out, for a given socket, if it has reachability to a given IP.
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