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pasta: make it possible to disable socket splicing

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During testing it is sometimes useful to force traffic which would
normally be forwared by socket splicing through the tap interface.

In this commit, we add a command switch enabling such funtionality
for inbound local traffic.

For outbound local traffic this is much trickier, if even possible,
so leave that for a later commit.

Suggested-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Jon Maloy <jmaloy@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Jon Maloy 2024-12-10 13:36:45 -05:00 committed by Stefano Brivio
parent 947f5cdb93
commit e24f026222
4 changed files with 14 additions and 2 deletions
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7
conf.c
View File

@ -977,7 +977,8 @@ pasta_opts:
" Don't copy all routes to namespace\n"
" --no-copy-addrs DEPRECATED:\n"
" Don't copy all addresses to namespace\n"
" --ns-mac-addr ADDR Set MAC address on tap interface\n");
" --ns-mac-addr ADDR Set MAC address on tap interface\n"
" --no-splice Disable inbound socket splicing\n");
exit(status);
}
@ -1319,6 +1320,7 @@ void conf(struct ctx *c, int argc, char **argv)
{"no-dhcpv6", no_argument, &c->no_dhcpv6, 1 },
{"no-ndp", no_argument, &c->no_ndp, 1 },
{"no-ra", no_argument, &c->no_ra, 1 },
{"no-splice", no_argument, &c->no_splice, 1 },
{"freebind", no_argument, &c->freebind, 1 },
{"no-map-gw", no_argument, &no_map_gw, 1 },
{"ipv4-only", no_argument, NULL, '4' },
@ -1756,6 +1758,9 @@ void conf(struct ctx *c, int argc, char **argv)
}
} while (name != -1);
if (c->mode != MODE_PASTA)
c->no_splice = 1;
if (c->mode == MODE_PASTA && !c->pasta_conf_ns) {
if (copy_routes_opt)
die("--no-copy-routes needs --config-net");

2
fwd.c
View File

@ -443,7 +443,7 @@ uint8_t fwd_nat_from_host(const struct ctx *c, uint8_t proto,
else if (proto == IPPROTO_UDP)
tgt->eport += c->udp.fwd_in.delta[tgt->eport];
if (c->mode == MODE_PASTA && inany_is_loopback(&ini->eaddr) &&
if (!c->no_splice && inany_is_loopback(&ini->eaddr) &&
(proto == IPPROTO_TCP || proto == IPPROTO_UDP)) {
/* spliceable */

5
passt.1
View File

@ -695,6 +695,11 @@ Configure MAC address \fIaddr\fR on the tap interface in the namespace.
Default is to let the tap driver build a pseudorandom hardware address.
.TP
.BR \-\-no-splice
Disable the bypass path for inbound, local traffic. See the section \fBHandling
of local traffic in pasta\fR in the \fBNOTES\fR for more details.
.SH EXAMPLES
.SS \fBpasta

2
passt.h
View File

@ -229,6 +229,7 @@ struct ip6_ctx {
* @no_dhcpv6: Disable DHCPv6 server
* @no_ndp: Disable NDP handler altogether
* @no_ra: Disable router advertisements
* @no_splice: Disable socket splicing for inbound traffic
* @host_lo_to_ns_lo: Map host loopback addresses to ns loopback addresses
* @freebind: Allow binding of non-local addresses for forwarding
* @low_wmem: Low probed net.core.wmem_max
@ -291,6 +292,7 @@ struct ctx {
int no_dhcpv6;
int no_ndp;
int no_ra;
int no_splice;
int host_lo_to_ns_lo;
int freebind;