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Message-Id: <20220315185603.160778-1-eyal.birger@gmail.com>
Date: Tue, 15 Mar 2022 20:56:03 +0200
From: Eyal Birger <eyal.birger@...il.com>
To: davem@...emloft.net, kuba@...nel.org
Cc: shmulik.ladkani@...il.com, netdev@...r.kernel.org,
Eyal Birger <eyal.birger@...il.com>
Subject: [PATCH net-next] net: geneve: support IPv4/IPv6 as inner protocol
This patch adds support for encapsulating IPv4/IPv6 within GENEVE.
In order use this, a new IFLA_GENEVE_TUN flag needs to be provided at
device creation. This property cannot be changed for the time being.
In case IP traffic is received on a non-tun device the drop count is
increased.
Signed-off-by: Eyal Birger <eyal.birger@...il.com>
---
drivers/net/geneve.c | 79 +++++++++++++++++++++++++++---------
include/uapi/linux/if_link.h | 1 +
2 files changed, 61 insertions(+), 19 deletions(-)
diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c
index a895ff756093..37305ec26250 100644
--- a/drivers/net/geneve.c
+++ b/drivers/net/geneve.c
@@ -56,6 +56,7 @@ struct geneve_config {
bool use_udp6_rx_checksums;
bool ttl_inherit;
enum ifla_geneve_df df;
+ bool tun;
};
/* Pseudo network device */
@@ -251,17 +252,24 @@ static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs,
}
}
- skb_reset_mac_header(skb);
- skb->protocol = eth_type_trans(skb, geneve->dev);
- skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
-
if (tun_dst)
skb_dst_set(skb, &tun_dst->dst);
- /* Ignore packet loops (and multicast echo) */
- if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr)) {
- geneve->dev->stats.rx_errors++;
- goto drop;
+ if (gnvh->proto_type == htons(ETH_P_TEB)) {
+ skb_reset_mac_header(skb);
+ skb->protocol = eth_type_trans(skb, geneve->dev);
+ skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
+
+ /* Ignore packet loops (and multicast echo) */
+ if (ether_addr_equal(eth_hdr(skb)->h_source,
+ geneve->dev->dev_addr)) {
+ geneve->dev->stats.rx_errors++;
+ goto drop;
+ }
+ } else {
+ skb_reset_mac_header(skb);
+ skb->dev = geneve->dev;
+ skb->pkt_type = PACKET_HOST;
}
oiph = skb_network_header(skb);
@@ -345,6 +353,7 @@ static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
struct genevehdr *geneveh;
struct geneve_dev *geneve;
struct geneve_sock *gs;
+ __be16 inner_proto;
int opts_len;
/* Need UDP and Geneve header to be present */
@@ -356,8 +365,13 @@ static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
if (unlikely(geneveh->ver != GENEVE_VER))
goto drop;
- if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
+ inner_proto = geneveh->proto_type;
+
+ if (unlikely((inner_proto != htons(ETH_P_TEB) &&
+ inner_proto != htons(ETH_P_IP) &&
+ inner_proto != htons(ETH_P_IPV6)))) {
goto drop;
+ }
gs = rcu_dereference_sk_user_data(sk);
if (!gs)
@@ -367,9 +381,13 @@ static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
if (!geneve)
goto drop;
+ if (unlikely((!geneve->cfg.tun && inner_proto != htons(ETH_P_TEB)))) {
+ geneve->dev->stats.rx_dropped++;
+ goto drop;
+ }
+
opts_len = geneveh->opt_len * 4;
- if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
- htons(ETH_P_TEB),
+ if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len, inner_proto,
!net_eq(geneve->net, dev_net(geneve->dev)))) {
geneve->dev->stats.rx_dropped++;
goto drop;
@@ -717,7 +735,8 @@ static int geneve_stop(struct net_device *dev)
}
static void geneve_build_header(struct genevehdr *geneveh,
- const struct ip_tunnel_info *info)
+ const struct ip_tunnel_info *info,
+ __be16 inner_proto)
{
geneveh->ver = GENEVE_VER;
geneveh->opt_len = info->options_len / 4;
@@ -725,7 +744,7 @@ static void geneve_build_header(struct genevehdr *geneveh,
geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT);
geneveh->rsvd1 = 0;
tunnel_id_to_vni(info->key.tun_id, geneveh->vni);
- geneveh->proto_type = htons(ETH_P_TEB);
+ geneveh->proto_type = inner_proto;
geneveh->rsvd2 = 0;
if (info->key.tun_flags & TUNNEL_GENEVE_OPT)
@@ -734,8 +753,9 @@ static void geneve_build_header(struct genevehdr *geneveh,
static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb,
const struct ip_tunnel_info *info,
- bool xnet, int ip_hdr_len)
+ bool xnet, int ip_hdr_len, bool tun)
{
+ __be16 inner_proto = tun ? skb->protocol : htons(ETH_P_TEB);
bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
struct genevehdr *gnvh;
int min_headroom;
@@ -755,8 +775,8 @@ static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb,
goto free_dst;
gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len);
- geneve_build_header(gnvh, info);
- skb_set_inner_protocol(skb, htons(ETH_P_TEB));
+ geneve_build_header(gnvh, info, inner_proto);
+ skb_set_inner_protocol(skb, inner_proto);
return 0;
free_dst:
@@ -959,7 +979,8 @@ static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
}
}
- err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr));
+ err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr),
+ geneve->cfg.tun);
if (unlikely(err))
return err;
@@ -1038,7 +1059,8 @@ static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
ttl = key->ttl;
ttl = ttl ? : ip6_dst_hoplimit(dst);
}
- err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr));
+ err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr),
+ geneve->cfg.tun);
if (unlikely(err))
return err;
@@ -1388,6 +1410,14 @@ static int geneve_configure(struct net *net, struct net_device *dev,
dst_cache_reset(&geneve->cfg.info.dst_cache);
memcpy(&geneve->cfg, cfg, sizeof(*cfg));
+ if (geneve->cfg.tun) {
+ dev->header_ops = NULL;
+ dev->type = ARPHRD_NONE;
+ dev->hard_header_len = 0;
+ dev->addr_len = 0;
+ dev->flags = IFF_NOARP;
+ }
+
err = register_netdevice(dev);
if (err)
return err;
@@ -1561,10 +1591,18 @@ static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[],
#endif
}
+ if (data[IFLA_GENEVE_TUN]) {
+ if (changelink) {
+ attrtype = IFLA_GENEVE_TUN;
+ goto change_notsup;
+ }
+ cfg->tun = true;
+ }
+
return 0;
change_notsup:
NL_SET_ERR_MSG_ATTR(extack, data[attrtype],
- "Changing VNI, Port, endpoint IP address family, external, and UDP checksum attributes are not supported");
+ "Changing VNI, Port, endpoint IP address family, external, tun, and UDP checksum attributes are not supported");
return -EOPNOTSUPP;
}
@@ -1799,6 +1837,9 @@ static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
if (nla_put_u8(skb, IFLA_GENEVE_TTL_INHERIT, ttl_inherit))
goto nla_put_failure;
+ if (geneve->cfg.tun && nla_put_flag(skb, IFLA_GENEVE_TUN))
+ goto nla_put_failure;
+
return 0;
nla_put_failure:
diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
index bd24c7dc10a2..198aefa2c513 100644
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -842,6 +842,7 @@ enum {
IFLA_GENEVE_LABEL,
IFLA_GENEVE_TTL_INHERIT,
IFLA_GENEVE_DF,
+ IFLA_GENEVE_TUN,
__IFLA_GENEVE_MAX
};
#define IFLA_GENEVE_MAX (__IFLA_GENEVE_MAX - 1)
--
2.32.0
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