From: David Gibson <david@gibson.dropbear.id.au>
To: Stefano Brivio <sbrivio@redhat.com>
Cc: passt-dev@passt.top, Callum Parsey <callum@neoninteger.au>,
me@yawnt.com, lemmi@nerd2nerd.org,
Andrea Arcangeli <aarcange@redhat.com>
Subject: Re: [PATCH v3 09/10] conf, pasta: With --config-net, copy all addresses by default
Date: Tue, 23 May 2023 13:05:30 +1000 [thread overview]
Message-ID: <ZGwtenQMP6567jBD@yekko> (raw)
In-Reply-To: <20230522174607.2824220-10-sbrivio@redhat.com>
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On Mon, May 22, 2023 at 07:46:06PM +0200, Stefano Brivio wrote:
> Use the newly-introduced NL_DUP mode for nl_addr() to copy all the
> addresses associated to the template interface in the outer
> namespace, unless --no-copy-addrs (also implied by -a) is given.
>
> This option is introduced as deprecated right away: it's not expected
> to be of any use, but it's helpful to keep it around for a while to
> debug any suspected issue with this change.
>
> This is done mostly for consistency with routes. It might partially
> cover the issue at:
> https://bugs.passt.top/show_bug.cgi?id=47
> Support multiple addresses per address family
>
> for some use cases, but not the originally intended one: we'll still
> use a single outbound address (unless the routing table specifies
> different preferred source addresses depending on the destination),
> regardless of the address used in the target namespace.
>
> Link: https://bugs.passt.top/show_bug.cgi?id=47
> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
> ---
> conf.c | 18 ++++++++++++++++--
> passt.1 | 14 ++++++++++++++
> passt.h | 2 ++
> pasta.c | 5 +++--
> 4 files changed, 35 insertions(+), 4 deletions(-)
>
> diff --git a/conf.c b/conf.c
> index cb1e09a..d8414fe 100644
> --- a/conf.c
> +++ b/conf.c
> @@ -902,6 +902,8 @@ pasta_opts:
> info( " --config-net Configure tap interface in namespace");
> info( " --no-copy-routes DEPRECATED:");
> info( " Don't copy all routes to namespace");
> + info( " --no-copy-addrs DEPRECATED:");
> + info( " Don't copy all addresses to namespace");
> info( " --ns-mac-addr ADDR Set MAC address on tap interface");
>
> exit(EXIT_FAILURE);
> @@ -1178,6 +1180,7 @@ void conf(struct ctx *c, int argc, char **argv)
> {"outbound-if6", required_argument, NULL, 16 },
> {"config-net", no_argument, NULL, 17 },
> {"no-copy-routes", no_argument, NULL, 18 },
> + {"no-copy-addrs", no_argument, NULL, 19 },
> { 0 },
> };
> struct get_bound_ports_ns_arg ns_ports_arg = { .c = c };
> @@ -1349,6 +1352,13 @@ void conf(struct ctx *c, int argc, char **argv)
> warn("--no-copy-routes will be dropped soon");
> c->no_copy_routes = 1;
> break;
> + case 19:
> + if (c->mode != MODE_PASTA)
> + die("--no-copy-addrs is for pasta mode only");
> +
> + warn("--no-copy-addrs will be dropped soon");
> + c->no_copy_addrs = 1;
> + break;
> case 'd':
> if (c->debug)
> die("Multiple --debug options given");
> @@ -1634,8 +1644,12 @@ void conf(struct ctx *c, int argc, char **argv)
> if (*c->sock_path && c->fd_tap >= 0)
> die("Options --socket and --fd are mutually exclusive");
>
> - if (c->mode == MODE_PASTA && c->no_copy_routes && !c->pasta_conf_ns)
> - die("Option --no-copy-routes needs --config-net");
> + if (c->mode == MODE_PASTA && !c->pasta_conf_ns) {
> + if (c->no_copy_routes)
> + die("Option --no-copy-routes needs --config-net");
> + if (c->no_copy_addrs)
> + die("Option --no-copy-addrs needs --config-net");
> + }
>
> if (!ifi4 && *c->ip4.ifname_out)
> ifi4 = if_nametoindex(c->ip4.ifname_out);
> diff --git a/passt.1 b/passt.1
> index 96ce96e..1ad4276 100644
> --- a/passt.1
> +++ b/passt.1
> @@ -563,6 +563,20 @@ future version. It is not expected to be of any use, and it simply reflects a
> legacy behaviour. If you have any use for this, refer to \fBREPORTING BUGS\fR
> below.
>
> +.TP
> +.BR \-\-no-copy-addrs " " (DEPRECATED)
> +With \-\-config-net, do not copy all the addresses associated to the interface
> +we derive addresses and routes from: set up a single one. Implied by \-a,
> +\-\-address.
> +
> +Default is to copy all the addresses, except for link-local ones, from the
> +interface from the outer namespace to the target namespace.
> +
> +Note that this configuration option is \fBdeprecated\fR and will be removed in a
> +future version. It is not expected to be of any use, and it simply reflects a
> +legacy behaviour. If you have any use for this, refer to \fBREPORTING BUGS\fR
> +below.
> +
> .TP
> .BR \-\-ns-mac-addr " " \fIaddr
> Configure MAC address \fIaddr\fR on the tap interface in the namespace.
> diff --git a/passt.h b/passt.h
> index d314596..b51a1e5 100644
> --- a/passt.h
> +++ b/passt.h
> @@ -183,6 +183,7 @@ struct ip6_ctx {
> * @pasta_ifn: Index of namespace interface for pasta
> * @pasta_conf_ns: Configure namespace after creating it
> * @no_copy_routes: Don't copy all routes when configuring target namespace
> + * @no_copy_addrs: Don't copy all addresses when configuring namespace
> * @no_tcp: Disable TCP operation
> * @tcp: Context for TCP protocol handler
> * @no_tcp: Disable UDP operation
> @@ -242,6 +243,7 @@ struct ctx {
> unsigned int pasta_ifi;
> int pasta_conf_ns;
> int no_copy_routes;
> + int no_copy_addrs;
>
> int no_tcp;
> struct tcp_ctx tcp;
> diff --git a/pasta.c b/pasta.c
> index 99ef3fc..4054e9a 100644
> --- a/pasta.c
> +++ b/pasta.c
> @@ -274,11 +274,12 @@ void pasta_ns_conf(struct ctx *c)
>
> if (c->pasta_conf_ns) {
> enum nl_op op_routes = c->no_copy_routes ? NL_SET : NL_DUP;
> + enum nl_op op_addrs = c->no_copy_addrs ? NL_SET : NL_DUP;
>
> nl_link(1, c->pasta_ifi, c->mac_guest, 1, c->mtu);
>
> if (c->ifi4) {
> - nl_addr(NL_SET, c->ifi4, c->pasta_ifi, AF_INET,
> + nl_addr(op_addrs, c->ifi4, c->pasta_ifi, AF_INET,
> &c->ip4.addr, &c->ip4.prefix_len, NULL);
> nl_route(op_routes, c->ifi4, c->pasta_ifi, AF_INET,
> &c->ip4.gw);
> @@ -286,7 +287,7 @@ void pasta_ns_conf(struct ctx *c)
>
> if (c->ifi6) {
> int prefix_len = 64;
> - nl_addr(NL_SET, c->ifi6, c->pasta_ifi, AF_INET6,
> + nl_addr(op_addrs, c->ifi6, c->pasta_ifi, AF_INET6,
> &c->ip6.addr, &prefix_len, NULL);
> nl_route(op_routes, c->ifi6, c->pasta_ifi, AF_INET6,
> &c->ip6.gw);
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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next prev parent reply other threads:[~2023-05-23 3:05 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-22 17:45 [PATCH v3 00/10] Optionally copy all routes and addresses for pasta, allow gateway-less routes Stefano Brivio
2023-05-22 17:45 ` [PATCH v3 01/10] netlink: Fix comment about response buffer size for nl_req() Stefano Brivio
2023-05-22 17:45 ` [PATCH v3 02/10] pasta: Improve error handling on failure to join network namespace Stefano Brivio
2023-05-23 13:47 ` Stefano Brivio
2023-05-22 17:46 ` [PATCH v3 03/10] netlink: Add functionality to copy routes from outer namespace Stefano Brivio
2023-05-22 17:46 ` [PATCH v3 04/10] conf: --config-net option is for pasta mode only Stefano Brivio
2023-05-22 17:46 ` [PATCH v3 05/10] conf, pasta: With --config-net, copy all routes by default Stefano Brivio
2023-05-23 3:04 ` David Gibson
2023-05-22 17:46 ` [PATCH v3 06/10] Revert "conf: Adjust netmask on mismatch between IPv4 address/netmask and gateway" Stefano Brivio
2023-05-22 17:46 ` [PATCH v3 07/10] conf: Don't exit if sourced default route has no gateway Stefano Brivio
2023-05-22 17:46 ` [PATCH v3 08/10] netlink: Add functionality to copy addresses from outer namespace Stefano Brivio
2023-05-22 17:46 ` [PATCH v3 09/10] conf, pasta: With --config-net, copy all addresses by default Stefano Brivio
2023-05-23 3:05 ` David Gibson [this message]
2023-05-22 17:46 ` [PATCH v3 10/10] passt.h: Fix description of pasta_ifi in struct ctx Stefano Brivio
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