Re: [PATCH iptables] libxt_cgroup2: add support for cgroup2 path matching
Hello,
On Wed, Nov 18, 2015 at 12:02:01AM +0100, Jan Engelhardt wrote:
> On Tuesday 2015-11-17 20:42, Tejun Heo wrote:
> >+static void cgroup2_save(const void *ip, const struct xt_entry_match *match)
> >+{
> >+const struct xt_cgroup2_info *info = (void *)match->data;
> >+
> >+printf("%s --path %s", info->invert ? " !" : "", info->path);
> >+}
>
> Can cgroup path names contain anything fancy, like spaces, backslashes, etc.?
> If so, xtables_save_string() will be needed here.
Will update.
> >+static struct xtables_match cgroup2_match = {
> >+.family = NFPROTO_UNSPEC,
> >+.name = "cgroup2",
> >+.version= XTABLES_VERSION,
> >+.size = XT_ALIGN(sizeof(struct xt_cgroup2_info)),
> >+.userspacesize = XT_ALIGN(sizeof(struct xt_cgroup2_info)),
>
> userspacesize must not include xt_cgroup2_info.priv.
> Change to offsetof(...), cf. other .c modules which do this.
Ah, okay.
...
> >+\fBIMPORTANT\fP: when being used in the INPUT chain, the cgroup2
> >+matcher is currently only of limited functionality, meaning it
> >+will only match on packets that are processed for local sockets
> >+through early socket demuxing. Therefore, general usage on the
> >+INPUT chain is disadviced unless the implications are well
>
> is disadviced (sic) -> is not advised
Will update. That's copied verbatim from xt_cgroup tho. Will create
a patch to update that too.
Thanks.
--
tejun
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Re: [PATCH iptables] libxt_cgroup2: add support for cgroup2 path matching
On Tuesday 2015-11-17 20:42, Tejun Heo wrote:
>+static void cgroup2_save(const void *ip, const struct xt_entry_match *match)
>+{
>+ const struct xt_cgroup2_info *info = (void *)match->data;
>+
>+ printf("%s --path %s", info->invert ? " !" : "", info->path);
>+}
Can cgroup path names contain anything fancy, like spaces, backslashes, etc.?
If so, xtables_save_string() will be needed here.
>+static struct xtables_match cgroup2_match = {
>+ .family = NFPROTO_UNSPEC,
>+ .name = "cgroup2",
>+ .version= XTABLES_VERSION,
>+ .size = XT_ALIGN(sizeof(struct xt_cgroup2_info)),
>+ .userspacesize = XT_ALIGN(sizeof(struct xt_cgroup2_info)),
userspacesize must not include xt_cgroup2_info.priv.
Change to offsetof(...), cf. other .c modules which do this.
>+++ b/extensions/libxt_cgroup2.man
>@@ -0,0 +1,24 @@
>+.TP
>+[\fB!\fP] \fB\-\-path\fP \fIpath\fP
>+Match cgroup2 membership.
>+
>+Each socket is associated with the v2 cgroup of the creating process.
>+This matches packets coming from or going to all sockets in the
>+sub-hierarchy of the specified path. The path should be relative to
>+the root of the cgroup2 hierarchy. Can be used in the OUTPUT and
>+INPUT chains to assign particular firewall policies for aggregated
>+processes on the system. This allows for more fine-grained firewall
>+policies that only match for a subset of the system's processes.
>+
>+\fBIMPORTANT\fP: when being used in the INPUT chain, the cgroup2
>+matcher is currently only of limited functionality, meaning it
>+will only match on packets that are processed for local sockets
>+through early socket demuxing. Therefore, general usage on the
>+INPUT chain is disadviced unless the implications are well
is disadviced (sic) -> is not advised
--
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Re: [PATCH iptables] libxt_cgroup2: add support for cgroup2 path matching
Hello,
On Wed, Nov 18, 2015 at 12:02:01AM +0100, Jan Engelhardt wrote:
> On Tuesday 2015-11-17 20:42, Tejun Heo wrote:
> >+static void cgroup2_save(const void *ip, const struct xt_entry_match *match)
> >+{
> >+const struct xt_cgroup2_info *info = (void *)match->data;
> >+
> >+printf("%s --path %s", info->invert ? " !" : "", info->path);
> >+}
>
> Can cgroup path names contain anything fancy, like spaces, backslashes, etc.?
> If so, xtables_save_string() will be needed here.
Will update.
> >+static struct xtables_match cgroup2_match = {
> >+.family = NFPROTO_UNSPEC,
> >+.name = "cgroup2",
> >+.version= XTABLES_VERSION,
> >+.size = XT_ALIGN(sizeof(struct xt_cgroup2_info)),
> >+.userspacesize = XT_ALIGN(sizeof(struct xt_cgroup2_info)),
>
> userspacesize must not include xt_cgroup2_info.priv.
> Change to offsetof(...), cf. other .c modules which do this.
Ah, okay.
...
> >+\fBIMPORTANT\fP: when being used in the INPUT chain, the cgroup2
> >+matcher is currently only of limited functionality, meaning it
> >+will only match on packets that are processed for local sockets
> >+through early socket demuxing. Therefore, general usage on the
> >+INPUT chain is disadviced unless the implications are well
>
> is disadviced (sic) -> is not advised
Will update. That's copied verbatim from xt_cgroup tho. Will create
a patch to update that too.
Thanks.
--
tejun
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Re: [PATCH iptables] libxt_cgroup2: add support for cgroup2 path matching
On Tuesday 2015-11-17 20:42, Tejun Heo wrote:
>+static void cgroup2_save(const void *ip, const struct xt_entry_match *match)
>+{
>+ const struct xt_cgroup2_info *info = (void *)match->data;
>+
>+ printf("%s --path %s", info->invert ? " !" : "", info->path);
>+}
Can cgroup path names contain anything fancy, like spaces, backslashes, etc.?
If so, xtables_save_string() will be needed here.
>+static struct xtables_match cgroup2_match = {
>+ .family = NFPROTO_UNSPEC,
>+ .name = "cgroup2",
>+ .version= XTABLES_VERSION,
>+ .size = XT_ALIGN(sizeof(struct xt_cgroup2_info)),
>+ .userspacesize = XT_ALIGN(sizeof(struct xt_cgroup2_info)),
userspacesize must not include xt_cgroup2_info.priv.
Change to offsetof(...), cf. other .c modules which do this.
>+++ b/extensions/libxt_cgroup2.man
>@@ -0,0 +1,24 @@
>+.TP
>+[\fB!\fP] \fB\-\-path\fP \fIpath\fP
>+Match cgroup2 membership.
>+
>+Each socket is associated with the v2 cgroup of the creating process.
>+This matches packets coming from or going to all sockets in the
>+sub-hierarchy of the specified path. The path should be relative to
>+the root of the cgroup2 hierarchy. Can be used in the OUTPUT and
>+INPUT chains to assign particular firewall policies for aggregated
>+processes on the system. This allows for more fine-grained firewall
>+policies that only match for a subset of the system's processes.
>+
>+\fBIMPORTANT\fP: when being used in the INPUT chain, the cgroup2
>+matcher is currently only of limited functionality, meaning it
>+will only match on packets that are processed for local sockets
>+through early socket demuxing. Therefore, general usage on the
>+INPUT chain is disadviced unless the implications are well
is disadviced (sic) -> is not advised
--
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the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
