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Date: Wed, 18 Mar 2020 01:39:40 +0100
From: Pablo Neira Ayuso <pablo@...filter.org>
To: netfilter-devel@...r.kernel.org
Cc: davem@...emloft.net, netdev@...r.kernel.org
Subject: [PATCH 13/29] netfilter: flowtable: add tunnel match offload support
From: wenxu <wenxu@...oud.cn>
This patch support both ipv4 and ipv6 tunnel_id, tunnel_src and
tunnel_dst match for flowtable offload
Signed-off-by: wenxu <wenxu@...oud.cn>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
include/net/netfilter/nf_flow_table.h | 6 ++++
net/netfilter/nf_flow_table_offload.c | 61 +++++++++++++++++++++++++++++++++--
2 files changed, 65 insertions(+), 2 deletions(-)
diff --git a/include/net/netfilter/nf_flow_table.h b/include/net/netfilter/nf_flow_table.h
index 6890f1ca3e31..f523ea87b6ae 100644
--- a/include/net/netfilter/nf_flow_table.h
+++ b/include/net/netfilter/nf_flow_table.h
@@ -19,11 +19,17 @@ enum flow_offload_tuple_dir;
struct nf_flow_key {
struct flow_dissector_key_meta meta;
struct flow_dissector_key_control control;
+ struct flow_dissector_key_control enc_control;
struct flow_dissector_key_basic basic;
union {
struct flow_dissector_key_ipv4_addrs ipv4;
struct flow_dissector_key_ipv6_addrs ipv6;
};
+ struct flow_dissector_key_keyid enc_key_id;
+ union {
+ struct flow_dissector_key_ipv4_addrs enc_ipv4;
+ struct flow_dissector_key_ipv6_addrs enc_ipv6;
+ };
struct flow_dissector_key_tcp tcp;
struct flow_dissector_key_ports tp;
} __aligned(BITS_PER_LONG / 8); /* Ensure that we can do comparisons as longs. */
diff --git a/net/netfilter/nf_flow_table_offload.c b/net/netfilter/nf_flow_table_offload.c
index f60f01e929b8..3101b35eac80 100644
--- a/net/netfilter/nf_flow_table_offload.c
+++ b/net/netfilter/nf_flow_table_offload.c
@@ -28,11 +28,61 @@ struct flow_offload_work {
(__match)->dissector.offset[__type] = \
offsetof(struct nf_flow_key, __field)
+static void nf_flow_rule_lwt_match(struct nf_flow_match *match,
+ struct ip_tunnel_info *tun_info)
+{
+ struct nf_flow_key *mask = &match->mask;
+ struct nf_flow_key *key = &match->key;
+ unsigned int enc_keys;
+
+ if (!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX))
+ return;
+
+ NF_FLOW_DISSECTOR(match, FLOW_DISSECTOR_KEY_ENC_CONTROL, enc_control);
+ NF_FLOW_DISSECTOR(match, FLOW_DISSECTOR_KEY_ENC_KEYID, enc_key_id);
+ key->enc_key_id.keyid = tunnel_id_to_key32(tun_info->key.tun_id);
+ mask->enc_key_id.keyid = 0xffffffff;
+ enc_keys = BIT(FLOW_DISSECTOR_KEY_ENC_KEYID) |
+ BIT(FLOW_DISSECTOR_KEY_ENC_CONTROL);
+
+ if (ip_tunnel_info_af(tun_info) == AF_INET) {
+ NF_FLOW_DISSECTOR(match, FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS,
+ enc_ipv4);
+ key->enc_ipv4.src = tun_info->key.u.ipv4.dst;
+ key->enc_ipv4.dst = tun_info->key.u.ipv4.src;
+ if (key->enc_ipv4.src)
+ mask->enc_ipv4.src = 0xffffffff;
+ if (key->enc_ipv4.dst)
+ mask->enc_ipv4.dst = 0xffffffff;
+ enc_keys |= BIT(FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS);
+ key->enc_control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
+ } else {
+ memcpy(&key->enc_ipv6.src, &tun_info->key.u.ipv6.dst,
+ sizeof(struct in6_addr));
+ memcpy(&key->enc_ipv6.dst, &tun_info->key.u.ipv6.src,
+ sizeof(struct in6_addr));
+ if (memcmp(&key->enc_ipv6.src, &in6addr_any,
+ sizeof(struct in6_addr)))
+ memset(&key->enc_ipv6.src, 0xff,
+ sizeof(struct in6_addr));
+ if (memcmp(&key->enc_ipv6.dst, &in6addr_any,
+ sizeof(struct in6_addr)))
+ memset(&key->enc_ipv6.dst, 0xff,
+ sizeof(struct in6_addr));
+ enc_keys |= BIT(FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS);
+ key->enc_control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
+ }
+
+ match->dissector.used_keys |= enc_keys;
+}
+
static int nf_flow_rule_match(struct nf_flow_match *match,
- const struct flow_offload_tuple *tuple)
+ const struct flow_offload_tuple *tuple,
+ struct dst_entry *other_dst)
{
struct nf_flow_key *mask = &match->mask;
struct nf_flow_key *key = &match->key;
+ struct ip_tunnel_info *tun_info;
NF_FLOW_DISSECTOR(match, FLOW_DISSECTOR_KEY_META, meta);
NF_FLOW_DISSECTOR(match, FLOW_DISSECTOR_KEY_CONTROL, control);
@@ -42,6 +92,11 @@ static int nf_flow_rule_match(struct nf_flow_match *match,
NF_FLOW_DISSECTOR(match, FLOW_DISSECTOR_KEY_TCP, tcp);
NF_FLOW_DISSECTOR(match, FLOW_DISSECTOR_KEY_PORTS, tp);
+ if (other_dst->lwtstate) {
+ tun_info = lwt_tun_info(other_dst->lwtstate);
+ nf_flow_rule_lwt_match(match, tun_info);
+ }
+
key->meta.ingress_ifindex = tuple->iifidx;
mask->meta.ingress_ifindex = 0xffffffff;
@@ -480,6 +535,7 @@ nf_flow_offload_rule_alloc(struct net *net,
const struct flow_offload *flow = offload->flow;
const struct flow_offload_tuple *tuple;
struct nf_flow_rule *flow_rule;
+ struct dst_entry *other_dst;
int err = -ENOMEM;
flow_rule = kzalloc(sizeof(*flow_rule), GFP_KERNEL);
@@ -495,7 +551,8 @@ nf_flow_offload_rule_alloc(struct net *net,
flow_rule->rule->match.key = &flow_rule->match.key;
tuple = &flow->tuplehash[dir].tuple;
- err = nf_flow_rule_match(&flow_rule->match, tuple);
+ other_dst = flow->tuplehash[!dir].tuple.dst_cache;
+ err = nf_flow_rule_match(&flow_rule->match, tuple, other_dst);
if (err < 0)
goto err_flow_match;
--
2.11.0
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