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* passt, pasta: Completely avoid dynamic memory allocationStefano Brivio2021-10-141-6/+4
| | | | | | | | | Replace libc functions that might dynamically allocate memory with own implementations or wrappers. Drop brk(2) from list of allowed syscalls in seccomp profile. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* passt, pasta: Add seccomp supportStefano Brivio2021-10-141-0/+2
| | | | | | | | | | | | | | | | | | List of allowed syscalls comes from comments in the form: #syscalls <list> for syscalls needed both in passt and pasta mode, and: #syscalls:pasta <list> #syscalls:passt <list> for syscalls specifically needed in pasta or passt mode only. seccomp.sh builds a list of BPF statements from those comments, prefixed by a binary search tree to keep lookup fast. While at it, clean up a bit the Makefile using wildcards. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* conf, tap: Split netlink and pasta functions, allow interface configurationStefano Brivio2021-10-141-316/+132
| | | | | | | | | | Move netlink routines to their own file, and use netlink to configure or fetch all the information we need, except for the TUNSETIFF ioctl. Move pasta-specific functions to their own file as well, add parameters and calls to configure the tap interface in the namespace. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* conf: Don't get IPv{4,6} DNS addresses if IPv{4,6} is disabledStefano Brivio2021-10-101-4/+6
| | | | Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* conf: Avoid getifaddrs(), split L2/L3 address fetching, get filtered dumpsStefano Brivio2021-10-101-123/+169
| | | | | | | | | | | | getifaddrs() needs to allocate heap memory, and gets a ton of results we don't need. Use explicit netlink messages with "strict checking" instead. While at it, separate L2/L3 address handling, so that we don't fetch MAC addresses for IPv6, and also use netlink instead of ioctl() to get the MAC address. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* conf: Fix getopt_long() return value for --quietStefano Brivio2021-10-071-1/+1
| | | | | | Only the short version actually worked. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* pasta: Allow specifying paths and names of namespacesGiuseppe Scrivano2021-10-071-12/+145
| | | | | | | | | | | | | | | | | | Based on a patch from Giuseppe Scrivano, this adds the ability to: - specify paths and names of target namespaces to join, instead of a PID, also for user namespaces, with --userns - request to join or create a network namespace only, without entering or creating a user namespace, with --netns-only - specify the base directory for netns mountpoints, with --nsrun-dir Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com> [sbrivio: reworked logic to actually join the given namespaces when they're not created, implemented --netns-only and --nsrun-dir, updated pasta demo script and man page] Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* conf: Silence gcc -Os warningStefano Brivio2021-10-051-1/+1
| | | | Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* conf, tcp: Periodic detection of bound ports for pasta port forwardingStefano Brivio2021-09-271-34/+51
| | | | | | | | | | Detecting bound ports at start-up time isn't terribly useful: do this periodically instead, if configured. This is only implemented for TCP at the moment, UDP is somewhat more complicated: leave a TODO there. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* conf: Actually zero-terminate DNS and search list arraysStefano Brivio2021-09-271-6/+11
| | | | | | This worked pretty much by chance until now. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* conf: Fix help message about default behaviour for UDP port forwardingStefano Brivio2021-09-091-6/+4
| | | | Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* conf, dhcp, ndp: Fix message about default MTU, make NDP consistentStefano Brivio2021-09-091-1/+14
| | | | Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* conf: Introduce PASST_LEGACY_NO_OPTIONS ifdef for legacyStefano Brivio2021-09-091-0/+12
| | | | | | | | Before introducing options, the default behaviour in passt mode was to forward all ports, to run in foreground and to log to stderr. Make it a bit more convenient to restore that at build time. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* conf: Fix check for IPv6 DNS address being already setStefano Brivio2021-09-011-1/+1
| | | | Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* conf: Minor fixes for usage messageStefano Brivio2021-09-011-4/+4
| | | | Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* passt, pasta: Introduce command-line options and port re-mappingStefano Brivio2021-09-011-0/+1163
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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