From: David Gibson <david@gibson.dropbear.id.au>
To: passt-dev@passt.top, Stefano Brivio <sbrivio@redhat.com>
Cc: David Gibson <david@gibson.dropbear.id.au>
Subject: [PATCH v2 07/16] udp: Don't create double sockets for -U port
Date: Thu, 24 Nov 2022 12:16:50 +1100 [thread overview]
Message-ID: <20221124011659.1024901-8-david@gibson.dropbear.id.au> (raw)
In-Reply-To: <20221124011659.1024901-1-david@gibson.dropbear.id.au>
For each IP version udp_socket() has 3 possible calls to sock_l4(). One
is for the "non-spliced" bound socket in the init namespace, one for the
"spliced" bound socket in the init namespace and one for the "spliced"
bound socket in the pasta namespace.
However when this is called to create a socket in the pasta namspeace there
is a logic error which causes it to take the path for the init side spliced
socket as well as the ns socket. This essentially tries to create two
identical sockets on the ns side. Unsurprisingly the second bind() call
fails according to strace.
Correct this to only attempt to open one socket within the ns.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
---
udp.c | 32 ++++++++++++++------------------
1 file changed, 14 insertions(+), 18 deletions(-)
diff --git a/udp.c b/udp.c
index 4c87e66..f93dd8b 100644
--- a/udp.c
+++ b/udp.c
@@ -1091,17 +1091,15 @@ void udp_sock_init(const struct ctx *c, int ns, sa_family_t af,
port, uref.u32);
udp_tap_map[V4][uref.udp.port].sock = s;
- }
-
- if (c->mode == MODE_PASTA) {
- bind_addr = &(uint32_t){ htonl(INADDR_LOOPBACK) };
- uref.udp.splice = uref.udp.orig = true;
- sock_l4(c, AF_INET, IPPROTO_UDP, bind_addr, ifname,
- port, uref.u32);
- }
+ if (c->mode == MODE_PASTA) {
+ bind_addr = &(uint32_t){ htonl(INADDR_LOOPBACK) };
+ uref.udp.splice = uref.udp.orig = true;
- if (ns) {
+ sock_l4(c, AF_INET, IPPROTO_UDP, bind_addr, ifname,
+ port, uref.u32);
+ }
+ } else {
uref.udp.splice = uref.udp.orig = uref.udp.ns = true;
bind_addr = &(uint32_t){ htonl(INADDR_LOOPBACK) };
@@ -1125,17 +1123,15 @@ void udp_sock_init(const struct ctx *c, int ns, sa_family_t af,
port, uref.u32);
udp_tap_map[V6][uref.udp.port].sock = s;
- }
-
- if (c->mode == MODE_PASTA) {
- bind_addr = &in6addr_loopback;
- uref.udp.splice = uref.udp.orig = true;
- sock_l4(c, AF_INET6, IPPROTO_UDP, bind_addr, ifname,
- port, uref.u32);
- }
+ if (c->mode == MODE_PASTA) {
+ bind_addr = &in6addr_loopback;
+ uref.udp.splice = uref.udp.orig = true;
- if (ns) {
+ sock_l4(c, AF_INET6, IPPROTO_UDP, bind_addr, ifname,
+ port, uref.u32);
+ }
+ } else {
bind_addr = &in6addr_loopback;
uref.udp.splice = uref.udp.orig = uref.udp.ns = true;
--
@@ -1091,17 +1091,15 @@ void udp_sock_init(const struct ctx *c, int ns, sa_family_t af,
port, uref.u32);
udp_tap_map[V4][uref.udp.port].sock = s;
- }
-
- if (c->mode == MODE_PASTA) {
- bind_addr = &(uint32_t){ htonl(INADDR_LOOPBACK) };
- uref.udp.splice = uref.udp.orig = true;
- sock_l4(c, AF_INET, IPPROTO_UDP, bind_addr, ifname,
- port, uref.u32);
- }
+ if (c->mode == MODE_PASTA) {
+ bind_addr = &(uint32_t){ htonl(INADDR_LOOPBACK) };
+ uref.udp.splice = uref.udp.orig = true;
- if (ns) {
+ sock_l4(c, AF_INET, IPPROTO_UDP, bind_addr, ifname,
+ port, uref.u32);
+ }
+ } else {
uref.udp.splice = uref.udp.orig = uref.udp.ns = true;
bind_addr = &(uint32_t){ htonl(INADDR_LOOPBACK) };
@@ -1125,17 +1123,15 @@ void udp_sock_init(const struct ctx *c, int ns, sa_family_t af,
port, uref.u32);
udp_tap_map[V6][uref.udp.port].sock = s;
- }
-
- if (c->mode == MODE_PASTA) {
- bind_addr = &in6addr_loopback;
- uref.udp.splice = uref.udp.orig = true;
- sock_l4(c, AF_INET6, IPPROTO_UDP, bind_addr, ifname,
- port, uref.u32);
- }
+ if (c->mode == MODE_PASTA) {
+ bind_addr = &in6addr_loopback;
+ uref.udp.splice = uref.udp.orig = true;
- if (ns) {
+ sock_l4(c, AF_INET6, IPPROTO_UDP, bind_addr, ifname,
+ port, uref.u32);
+ }
+ } else {
bind_addr = &in6addr_loopback;
uref.udp.splice = uref.udp.orig = uref.udp.ns = true;
--
2.38.1
next prev parent reply other threads:[~2022-11-24 1:17 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-24 1:16 [PATCH v2 00/16] Simplify and correct handling of "spliced" UDP forwarding David Gibson
2022-11-24 1:16 ` [PATCH v2 01/16] udp: Also bind() connected ports for "splice" forwarding David Gibson
2022-11-25 1:47 ` Stefano Brivio
2022-11-25 7:01 ` David Gibson
2022-11-24 1:16 ` [PATCH v2 02/16] udp: Separate tracking of inbound and outbound packet flows David Gibson
2022-11-25 1:47 ` Stefano Brivio
2022-11-25 7:06 ` David Gibson
2022-11-24 1:16 ` [PATCH v2 03/16] udp: Always use sendto() rather than send() for forwarding spliced packets David Gibson
2022-11-24 1:16 ` [PATCH v2 04/16] udp: Don't connect "forward" sockets for spliced flows David Gibson
2022-11-25 1:47 ` Stefano Brivio
2022-11-25 7:07 ` David Gibson
2022-12-01 18:49 ` Stefano Brivio
2022-11-24 1:16 ` [PATCH v2 05/16] udp: Remove the @bound field from union udp_epoll_ref David Gibson
2022-11-24 1:16 ` [PATCH v2 06/16] udp: Split splice field in udp_epoll_ref into (mostly) independent bits David Gibson
2022-11-24 1:16 ` David Gibson [this message]
2022-11-24 1:16 ` [PATCH v2 08/16] udp: Re-use fixed bound sockets for packet forwarding when possible David Gibson
2022-11-24 1:16 ` [PATCH v2 09/16] udp: Don't explicitly track originating socket for spliced "connections" David Gibson
2022-11-25 1:48 ` Stefano Brivio
2022-11-25 7:09 ` David Gibson
2022-11-24 1:16 ` [PATCH v2 10/16] udp: Update UDP "connection" timestamps in both directions David Gibson
2022-11-24 1:16 ` [PATCH v2 11/16] udp: Simplify udp_sock_handler_splice David Gibson
2022-11-24 1:16 ` [PATCH v2 12/16] udp: Make UDP_SPLICE_FRAMES and UDP_TAP_FRAMES_MEM the same thing David Gibson
2022-11-24 1:16 ` [PATCH v2 13/16] udp: Add helper to extract port from a sockaddr_in or sockaddr_in6 David Gibson
2022-11-25 1:48 ` Stefano Brivio
2022-11-25 7:10 ` David Gibson
2022-11-24 1:16 ` [PATCH v2 14/16] udp: Unify buffers for tap and splice paths David Gibson
2022-11-24 1:16 ` [PATCH v2 15/16] udp: Split send half of udp_sock_handler_splice() from the receive half David Gibson
2022-11-24 1:16 ` [PATCH v2 16/16] udp: Correct splice forwarding when receiving from multiple sources David Gibson
2022-11-29 5:55 ` David Gibson
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