src: Support netdev egress hook

Add userspace support for the netdev egress hook which is queued up for
v5.16-rc1, complete with documentation and tests.  Usage is identical to
the ingress hook.

Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

15 files changed, 42 insertions, 14 deletions

diff --git a/tests/py/inet/ah.t b/tests/py/inet/ah.t
index 78c454f7..83b6202b 100644
--- a/tests/py/inet/ah.t
+++ b/tests/py/inet/ah.t
@@ -1,10 +1,11 @@
 :input;type filter hook input priority 0
 :ingress;type filter hook ingress device lo priority 0
+:egress;type filter hook egress device lo priority 0
 
 *ip;test-ip4;input
 *ip6;test-ip6;input
 *inet;test-inet;input
-*netdev;test-netdev;ingress
+*netdev;test-netdev;ingress,egress
 
 - ah nexthdr esp;ok
 - ah nexthdr ah;ok
diff --git a/tests/py/inet/comp.t b/tests/py/inet/comp.t
index ec9924ff..2ef53820 100644
--- a/tests/py/inet/comp.t
+++ b/tests/py/inet/comp.t
@@ -1,10 +1,11 @@
 :input;type filter hook input priority 0
 :ingress;type filter hook ingress device lo priority 0
+:egress;type filter hook egress device lo priority 0
 
 *ip;test-ip4;input
 *ip6;test-ip6;input
 *inet;test-inet;input
-*netdev;test-netdev;ingress
+*netdev;test-netdev;ingress,egress
 
 # BUG: nft: payload.c:88: payload_expr_pctx_update: Assertion `left->payload.base + 1 <= (__PROTO_BASE_MAX - 1)' failed.
 - comp nexthdr esp;ok;comp nexthdr 50
diff --git a/tests/py/inet/dccp.t b/tests/py/inet/dccp.t
index 2216fa2a..90142f53 100644
--- a/tests/py/inet/dccp.t
+++ b/tests/py/inet/dccp.t
@@ -1,10 +1,11 @@
 :input;type filter hook input priority 0
 :ingress;type filter hook ingress device lo priority 0
+:egress;type filter hook egress device lo priority 0
 
 *ip;test-ip4;input
 *ip6;test-ip6;input
 *inet;test-inet;input
-*netdev;test-netdev;ingress
+*netdev;test-netdev;ingress,egress
 
 dccp sport 21-35;ok
 dccp sport != 21-35;ok
diff --git a/tests/py/inet/esp.t b/tests/py/inet/esp.t
index 58e9f884..536260cf 100644
--- a/tests/py/inet/esp.t
+++ b/tests/py/inet/esp.t
@@ -1,10 +1,11 @@
 :input;type filter hook input priority 0
 :ingress;type filter hook ingress device lo priority 0
+:egress;type filter hook egress device lo priority 0
 
 *ip;test-ip4;input
 *ip6;test-ip6;input
 *inet;test-inet;input
-*netdev;test-netdev;ingress
+*netdev;test-netdev;ingress,egress
 
 esp spi 100;ok
 esp spi != 100;ok
diff --git a/tests/py/inet/ether-ip.t b/tests/py/inet/ether-ip.t
index 0c8c7f9d..759124de 100644
--- a/tests/py/inet/ether-ip.t
+++ b/tests/py/inet/ether-ip.t
@@ -1,8 +1,9 @@
 :input;type filter hook input priority 0
 :ingress;type filter hook ingress device lo priority 0
+:egress;type filter hook egress device lo priority 0
 
 *inet;test-inet;input
-*netdev;test-netdev;ingress
+*netdev;test-netdev;ingress,egress
 
 tcp dport 22 iiftype ether ip daddr 1.2.3.4 ether saddr 00:0f:54:0c:11:4 accept;ok;tcp dport 22 ether saddr 00:0f:54:0c:11:04 ip daddr 1.2.3.4 accept
 tcp dport 22 ip daddr 1.2.3.4 ether saddr 00:0f:54:0c:11:04;ok
diff --git a/tests/py/inet/ether.t b/tests/py/inet/ether.t
index afdf8b89..c4b1ced7 100644
--- a/tests/py/inet/ether.t
+++ b/tests/py/inet/ether.t
@@ -1,11 +1,12 @@
 :input;type filter hook input priority 0
 :ingress;type filter hook ingress device lo priority 0
+:egress;type filter hook egress device lo priority 0
 
 *ip;test-ip4;input
 *ip6;test-ip6;input
 *inet;test-inet;input
 *bridge;test-bridge;input
-*netdev;test-netdev;ingress
+*netdev;test-netdev;ingress,egress
 
 tcp dport 22 iiftype ether ether saddr 00:0f:54:0c:11:4 accept;ok;tcp dport 22 ether saddr 00:0f:54:0c:11:04 accept
 tcp dport 22 ether saddr 00:0f:54:0c:11:04 accept;ok
diff --git a/tests/py/inet/ip.t b/tests/py/inet/ip.t
index ac5b825e..bdb3330c 100644
--- a/tests/py/inet/ip.t
+++ b/tests/py/inet/ip.t
@@ -1,10 +1,11 @@
 :input;type filter hook input priority 0
 :ingress;type filter hook ingress device lo priority 0
+:egress;type filter hook egress device lo priority 0
 
 *ip;test-ip4;input
 *inet;test-inet;input
 *bridge;test-bridge;input
-*netdev;test-netdev;ingress
+*netdev;test-netdev;ingress,egress
 
 ip saddr . ip daddr . ether saddr { 1.1.1.1 . 2.2.2.2 . ca:fe:ca:fe:ca:fe };ok
 ip saddr vmap { 10.0.1.0-10.0.1.255 : accept, 10.0.1.1-10.0.2.255 : drop };fail
diff --git a/tests/py/inet/ip.t.payload.netdev b/tests/py/inet/ip.t.payload.netdev
index 95be9194..38ed0ad3 100644
--- a/tests/py/inet/ip.t.payload.netdev
+++ b/tests/py/inet/ip.t.payload.netdev
@@ -12,3 +12,17 @@ netdev test-netdev ingress
   [ payload load 6b @ link header + 6 => reg 10 ]
   [ lookup reg 1 set __set%d ]
 
+# meta protocol ip ip saddr . ip daddr . ether saddr { 1.1.1.1 . 2.2.2.2 . ca:fe:ca:fe:ca:fe }
+__set%d test-netdev 3
+__set%d test-netdev 0
+	element 01010101 02020202 fecafeca 0000feca  : 0 [end]
+netdev test-netdev egress 
+  [ meta load protocol => reg 1 ]
+  [ cmp eq reg 1 0x00000008 ]
+  [ meta load iiftype => reg 1 ]
+  [ cmp eq reg 1 0x00000001 ]
+  [ payload load 4b @ network header + 12 => reg 1 ]
+  [ payload load 4b @ network header + 16 => reg 9 ]
+  [ payload load 6b @ link header + 6 => reg 10 ]
+  [ lookup reg 1 set __set%d ]
+
diff --git a/tests/py/inet/ip_tcp.t b/tests/py/inet/ip_tcp.t
index f2a28ebd..ab76ffa9 100644
--- a/tests/py/inet/ip_tcp.t
+++ b/tests/py/inet/ip_tcp.t
@@ -1,9 +1,10 @@
 :input;type filter hook input priority 0
 :ingress;type filter hook ingress device lo priority 0
+:egress;type filter hook egress device lo priority 0
 
 *inet;test-inet;input
 *bridge;test-bridge;input
-*netdev;test-netdev;ingress
+*netdev;test-netdev;ingress,egress
 
 # must not remove ip dependency -- ONLY ipv4 packets should be matched
 ip protocol tcp tcp dport 22;ok;ip protocol 6 tcp dport 22
diff --git a/tests/py/inet/map.t b/tests/py/inet/map.t
index e83490a8..5a7161b7 100644
--- a/tests/py/inet/map.t
+++ b/tests/py/inet/map.t
@@ -1,9 +1,10 @@
 :input;type filter hook input priority 0
 :ingress;type filter hook ingress device lo priority 0
+:egress;type filter hook egress device lo priority 0
 
 *ip;test-ip4;input
 *inet;test-inet;input
-*netdev;test-netdev;ingress
+*netdev;test-netdev;ingress,egress
 
 mark set ip saddr map { 10.2.3.2 : 0x0000002a, 10.2.3.1 : 0x00000017};ok;meta mark set ip saddr map { 10.2.3.1 : 0x00000017, 10.2.3.2 : 0x0000002a}
 mark set ip hdrlength map { 5 : 0x00000017, 4 : 0x00000001};ok;meta mark set ip hdrlength map { 4 : 0x00000001, 5 : 0x00000017}
diff --git a/tests/py/inet/sctp.t b/tests/py/inet/sctp.t
index 57b9e67b..016173b9 100644
--- a/tests/py/inet/sctp.t
+++ b/tests/py/inet/sctp.t
@@ -1,10 +1,11 @@
 :input;type filter hook input priority 0
 :ingress;type filter hook ingress device lo priority 0
+:egress;type filter hook egress device lo priority 0
 
 *ip;test-ip4;input
 *ip6;test-ip6;input
 *inet;test-inet;input
-*netdev;test-netdev;ingress
+*netdev;test-netdev;ingress,egress
 
 sctp sport 23;ok
 sctp sport != 23;ok
diff --git a/tests/py/inet/sets.t b/tests/py/inet/sets.t
index 1c6f3235..5b22e1fe 100644
--- a/tests/py/inet/sets.t
+++ b/tests/py/inet/sets.t
@@ -1,9 +1,10 @@
 :input;type filter hook input priority 0
 :ingress;type filter hook ingress device lo priority 0
+:egress;type filter hook egress device lo priority 0
 
 *inet;test-inet;input
 *bridge;test-inet;input
-*netdev;test-netdev;ingress
+*netdev;test-netdev;ingress,egress
 
 !set1 type ipv4_addr timeout 60s;ok
 ?set1 192.168.3.4 timeout 30s, 10.2.1.1;ok
diff --git a/tests/py/inet/tcp.t b/tests/py/inet/tcp.t
index aa07c3ba..f51ebd36 100644
--- a/tests/py/inet/tcp.t
+++ b/tests/py/inet/tcp.t
@@ -1,10 +1,11 @@
 :input;type filter hook input priority 0
 :ingress;type filter hook ingress device lo priority 0
+:egress;type filter hook egress device lo priority 0
 
 *ip;test-ip4;input
 *ip6;test-ip6;input
 *inet;test-inet;input
-*netdev;test-netdev;ingress
+*netdev;test-netdev;ingress,egress
 
 tcp dport set {1, 2, 3};fail
 
diff --git a/tests/py/inet/udp.t b/tests/py/inet/udp.t
index c434f2ed..7f21c8ed 100644
--- a/tests/py/inet/udp.t
+++ b/tests/py/inet/udp.t
@@ -1,10 +1,11 @@
 :input;type filter hook input priority 0
 :ingress;type filter hook ingress device lo priority 0
+:egress;type filter hook egress device lo priority 0
 
 *ip;test-ip4;input
 *ip6;test-ip6;input
 *inet;test-inet;input
-*netdev;test-netdev;ingress
+*netdev;test-netdev;ingress,egress
 
 udp sport 80 accept;ok
 udp sport != 60 accept;ok
diff --git a/tests/py/inet/udplite.t b/tests/py/inet/udplite.t
index a8fdc8ea..6a54709c 100644
--- a/tests/py/inet/udplite.t
+++ b/tests/py/inet/udplite.t
@@ -1,10 +1,11 @@
 :input;type filter hook input priority 0
 :ingress;type filter hook ingress device lo priority 0
+:egress;type filter hook egress device lo priority 0
 
 *ip;test-ip4;input
 *ip6;test-ip6;input
 *inet;test-inet;input
-*netdev;test-netdev;ingress
+*netdev;test-netdev;ingress,egress
 
 udplite sport 80 accept;ok
 udplite sport != 60 accept;ok