blob: de5c30c9f059203040cc47e83cce76ae9e5bfde6 [file] [log] [blame]
/*
* GENEVE: Generic Network Virtualization Encapsulation
*
* Copyright (c) 2015 Red Hat, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/hash.h>
#include <net/dst_metadata.h>
#include <net/gro_cells.h>
#include <net/rtnetlink.h>
#include <net/geneve.h>
#include <net/protocol.h>
#define GENEVE_NETDEV_VER "0.6"
#define GENEVE_UDP_PORT 6081
#define GENEVE_N_VID (1u << 24)
#define GENEVE_VID_MASK (GENEVE_N_VID - 1)
#define VNI_HASH_BITS 10
#define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
static bool log_ecn_error = true;
module_param(log_ecn_error, bool, 0644);
MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
#define GENEVE_VER 0
#define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr))
/* per-network namespace private data for this module */
struct geneve_net {
struct list_head geneve_list;
struct list_head sock_list;
};
static int geneve_net_id;
union geneve_addr {
struct sockaddr_in sin;
struct sockaddr_in6 sin6;
struct sockaddr sa;
};
static union geneve_addr geneve_remote_unspec = { .sa.sa_family = AF_UNSPEC, };
/* Pseudo network device */
struct geneve_dev {
struct hlist_node hlist; /* vni hash table */
struct net *net; /* netns for packet i/o */
struct net_device *dev; /* netdev for geneve tunnel */
struct geneve_sock *sock4; /* IPv4 socket used for geneve tunnel */
#if IS_ENABLED(CONFIG_IPV6)
struct geneve_sock *sock6; /* IPv6 socket used for geneve tunnel */
#endif
u8 vni[3]; /* virtual network ID for tunnel */
u8 ttl; /* TTL override */
u8 tos; /* TOS override */
union geneve_addr remote; /* IP address for link partner */
struct list_head next; /* geneve's per namespace list */
__be16 dst_port;
bool collect_md;
struct gro_cells gro_cells;
};
struct geneve_sock {
bool collect_md;
struct list_head list;
struct socket *sock;
struct rcu_head rcu;
int refcnt;
struct udp_offload udp_offloads;
struct hlist_head vni_list[VNI_HASH_SIZE];
};
static inline __u32 geneve_net_vni_hash(u8 vni[3])
{
__u32 vnid;
vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
return hash_32(vnid, VNI_HASH_BITS);
}
static __be64 vni_to_tunnel_id(const __u8 *vni)
{
#ifdef __BIG_ENDIAN
return (vni[0] << 16) | (vni[1] << 8) | vni[2];
#else
return (__force __be64)(((__force u64)vni[0] << 40) |
((__force u64)vni[1] << 48) |
((__force u64)vni[2] << 56));
#endif
}
static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
__be32 addr, u8 vni[])
{
struct hlist_head *vni_list_head;
struct geneve_dev *geneve;
__u32 hash;
/* Find the device for this VNI */
hash = geneve_net_vni_hash(vni);
vni_list_head = &gs->vni_list[hash];
hlist_for_each_entry_rcu(geneve, vni_list_head, hlist) {
if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) &&
addr == geneve->remote.sin.sin_addr.s_addr)
return geneve;
}
return NULL;
}
#if IS_ENABLED(CONFIG_IPV6)
static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
struct in6_addr addr6, u8 vni[])
{
struct hlist_head *vni_list_head;
struct geneve_dev *geneve;
__u32 hash;
/* Find the device for this VNI */
hash = geneve_net_vni_hash(vni);
vni_list_head = &gs->vni_list[hash];
hlist_for_each_entry_rcu(geneve, vni_list_head, hlist) {
if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) &&
ipv6_addr_equal(&addr6, &geneve->remote.sin6.sin6_addr))
return geneve;
}
return NULL;
}
#endif
static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
{
return (struct genevehdr *)(udp_hdr(skb) + 1);
}
/* geneve receive/decap routine */
static void geneve_rx(struct geneve_sock *gs, struct sk_buff *skb)
{
struct genevehdr *gnvh = geneve_hdr(skb);
struct metadata_dst *tun_dst = NULL;
struct geneve_dev *geneve = NULL;
struct pcpu_sw_netstats *stats;
struct iphdr *iph = NULL;
__be32 addr;
static u8 zero_vni[3];
u8 *vni;
int err = 0;
sa_family_t sa_family;
#if IS_ENABLED(CONFIG_IPV6)
struct ipv6hdr *ip6h = NULL;
struct in6_addr addr6;
static struct in6_addr zero_addr6;
#endif
sa_family = gs->sock->sk->sk_family;
if (sa_family == AF_INET) {
iph = ip_hdr(skb); /* outer IP header... */
if (gs->collect_md) {
vni = zero_vni;
addr = 0;
} else {
vni = gnvh->vni;
addr = iph->saddr;
}
geneve = geneve_lookup(gs, addr, vni);
#if IS_ENABLED(CONFIG_IPV6)
} else if (sa_family == AF_INET6) {
ip6h = ipv6_hdr(skb); /* outer IPv6 header... */
if (gs->collect_md) {
vni = zero_vni;
addr6 = zero_addr6;
} else {
vni = gnvh->vni;
addr6 = ip6h->saddr;
}
geneve = geneve6_lookup(gs, addr6, vni);
#endif
}
if (!geneve)
goto drop;
if (ip_tunnel_collect_metadata() || gs->collect_md) {
__be16 flags;
flags = TUNNEL_KEY | TUNNEL_GENEVE_OPT |
(gnvh->oam ? TUNNEL_OAM : 0) |
(gnvh->critical ? TUNNEL_CRIT_OPT : 0);
tun_dst = udp_tun_rx_dst(skb, sa_family, flags,
vni_to_tunnel_id(gnvh->vni),
gnvh->opt_len * 4);
if (!tun_dst)
goto drop;
/* Update tunnel dst according to Geneve options. */
ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
gnvh->options, gnvh->opt_len * 4);
} else {
/* Drop packets w/ critical options,
* since we don't support any...
*/
if (gnvh->critical)
goto drop;
}
skb_reset_mac_header(skb);
skb_scrub_packet(skb, !net_eq(geneve->net, dev_net(geneve->dev)));
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))
goto drop;
skb_reset_network_header(skb);
if (iph)
err = IP_ECN_decapsulate(iph, skb);
#if IS_ENABLED(CONFIG_IPV6)
if (ip6h)
err = IP6_ECN_decapsulate(ip6h, skb);
#endif
if (unlikely(err)) {
if (log_ecn_error) {
if (iph)
net_info_ratelimited("non-ECT from %pI4 "
"with TOS=%#x\n",
&iph->saddr, iph->tos);
#if IS_ENABLED(CONFIG_IPV6)
if (ip6h)
net_info_ratelimited("non-ECT from %pI6\n",
&ip6h->saddr);
#endif
}
if (err > 1) {
++geneve->dev->stats.rx_frame_errors;
++geneve->dev->stats.rx_errors;
goto drop;
}
}
stats = this_cpu_ptr(geneve->dev->tstats);
u64_stats_update_begin(&stats->syncp);
stats->rx_packets++;
stats->rx_bytes += skb->len;
u64_stats_update_end(&stats->syncp);
gro_cells_receive(&geneve->gro_cells, skb);
return;
drop:
/* Consume bad packet */
kfree_skb(skb);
}
/* Setup stats when device is created */
static int geneve_init(struct net_device *dev)
{
struct geneve_dev *geneve = netdev_priv(dev);
int err;
dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
if (!dev->tstats)
return -ENOMEM;
err = gro_cells_init(&geneve->gro_cells, dev);
if (err) {
free_percpu(dev->tstats);
return err;
}
return 0;
}
static void geneve_uninit(struct net_device *dev)
{
struct geneve_dev *geneve = netdev_priv(dev);
gro_cells_destroy(&geneve->gro_cells);
free_percpu(dev->tstats);
}
/* Callback from net/ipv4/udp.c to receive packets */
static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
{
struct genevehdr *geneveh;
struct geneve_sock *gs;
int opts_len;
/* Need Geneve and inner Ethernet header to be present */
if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
goto error;
/* Return packets with reserved bits set */
geneveh = geneve_hdr(skb);
if (unlikely(geneveh->ver != GENEVE_VER))
goto error;
if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
goto error;
opts_len = geneveh->opt_len * 4;
if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
htons(ETH_P_TEB)))
goto drop;
gs = rcu_dereference_sk_user_data(sk);
if (!gs)
goto drop;
geneve_rx(gs, skb);
return 0;
drop:
/* Consume bad packet */
kfree_skb(skb);
return 0;
error:
/* Let the UDP layer deal with the skb */
return 1;
}
static struct socket *geneve_create_sock(struct net *net, bool ipv6,
__be16 port)
{
struct socket *sock;
struct udp_port_cfg udp_conf;
int err;
memset(&udp_conf, 0, sizeof(udp_conf));
if (ipv6) {
udp_conf.family = AF_INET6;
udp_conf.ipv6_v6only = 1;
} else {
udp_conf.family = AF_INET;
udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
}
udp_conf.local_udp_port = port;
/* Open UDP socket */
err = udp_sock_create(net, &udp_conf, &sock);
if (err < 0)
return ERR_PTR(err);
return sock;
}
static void geneve_notify_add_rx_port(struct geneve_sock *gs)
{
struct sock *sk = gs->sock->sk;
sa_family_t sa_family = sk->sk_family;
int err;
if (sa_family == AF_INET) {
err = udp_add_offload(&gs->udp_offloads);
if (err)
pr_warn("geneve: udp_add_offload failed with status %d\n",
err);
}
}
static int geneve_hlen(struct genevehdr *gh)
{
return sizeof(*gh) + gh->opt_len * 4;
}
static struct sk_buff **geneve_gro_receive(struct sk_buff **head,
struct sk_buff *skb,
struct udp_offload *uoff)
{
struct sk_buff *p, **pp = NULL;
struct genevehdr *gh, *gh2;
unsigned int hlen, gh_len, off_gnv;
const struct packet_offload *ptype;
__be16 type;
int flush = 1;
off_gnv = skb_gro_offset(skb);
hlen = off_gnv + sizeof(*gh);
gh = skb_gro_header_fast(skb, off_gnv);
if (skb_gro_header_hard(skb, hlen)) {
gh = skb_gro_header_slow(skb, hlen, off_gnv);
if (unlikely(!gh))
goto out;
}
if (gh->ver != GENEVE_VER || gh->oam)
goto out;
gh_len = geneve_hlen(gh);
hlen = off_gnv + gh_len;
if (skb_gro_header_hard(skb, hlen)) {
gh = skb_gro_header_slow(skb, hlen, off_gnv);
if (unlikely(!gh))
goto out;
}
flush = 0;
for (p = *head; p; p = p->next) {
if (!NAPI_GRO_CB(p)->same_flow)
continue;
gh2 = (struct genevehdr *)(p->data + off_gnv);
if (gh->opt_len != gh2->opt_len ||
memcmp(gh, gh2, gh_len)) {
NAPI_GRO_CB(p)->same_flow = 0;
continue;
}
}
type = gh->proto_type;
rcu_read_lock();
ptype = gro_find_receive_by_type(type);
if (!ptype) {
flush = 1;
goto out_unlock;
}
skb_gro_pull(skb, gh_len);
skb_gro_postpull_rcsum(skb, gh, gh_len);
pp = ptype->callbacks.gro_receive(head, skb);
out_unlock:
rcu_read_unlock();
out:
NAPI_GRO_CB(skb)->flush |= flush;
return pp;
}
static int geneve_gro_complete(struct sk_buff *skb, int nhoff,
struct udp_offload *uoff)
{
struct genevehdr *gh;
struct packet_offload *ptype;
__be16 type;
int gh_len;
int err = -ENOSYS;
udp_tunnel_gro_complete(skb, nhoff);
gh = (struct genevehdr *)(skb->data + nhoff);
gh_len = geneve_hlen(gh);
type = gh->proto_type;
rcu_read_lock();
ptype = gro_find_complete_by_type(type);
if (ptype)
err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
rcu_read_unlock();
return err;
}
/* Create new listen socket if needed */
static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
bool ipv6)
{
struct geneve_net *gn = net_generic(net, geneve_net_id);
struct geneve_sock *gs;
struct socket *sock;
struct udp_tunnel_sock_cfg tunnel_cfg;
int h;
gs = kzalloc(sizeof(*gs), GFP_KERNEL);
if (!gs)
return ERR_PTR(-ENOMEM);
sock = geneve_create_sock(net, ipv6, port);
if (IS_ERR(sock)) {
kfree(gs);
return ERR_CAST(sock);
}
gs->sock = sock;
gs->refcnt = 1;
for (h = 0; h < VNI_HASH_SIZE; ++h)
INIT_HLIST_HEAD(&gs->vni_list[h]);
/* Initialize the geneve udp offloads structure */
gs->udp_offloads.port = port;
gs->udp_offloads.callbacks.gro_receive = geneve_gro_receive;
gs->udp_offloads.callbacks.gro_complete = geneve_gro_complete;
geneve_notify_add_rx_port(gs);
/* Mark socket as an encapsulation socket */
tunnel_cfg.sk_user_data = gs;
tunnel_cfg.encap_type = 1;
tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
tunnel_cfg.encap_destroy = NULL;
setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
list_add(&gs->list, &gn->sock_list);
return gs;
}
static void geneve_notify_del_rx_port(struct geneve_sock *gs)
{
struct sock *sk = gs->sock->sk;
sa_family_t sa_family = sk->sk_family;
if (sa_family == AF_INET)
udp_del_offload(&gs->udp_offloads);
}
static void __geneve_sock_release(struct geneve_sock *gs)
{
if (!gs || --gs->refcnt)
return;
list_del(&gs->list);
geneve_notify_del_rx_port(gs);
udp_tunnel_sock_release(gs->sock);
kfree_rcu(gs, rcu);
}
static void geneve_sock_release(struct geneve_dev *geneve)
{
__geneve_sock_release(geneve->sock4);
#if IS_ENABLED(CONFIG_IPV6)
__geneve_sock_release(geneve->sock6);
#endif
}
static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
sa_family_t family,
__be16 dst_port)
{
struct geneve_sock *gs;
list_for_each_entry(gs, &gn->sock_list, list) {
if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
inet_sk(gs->sock->sk)->sk.sk_family == family) {
return gs;
}
}
return NULL;
}
static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6)
{
struct net *net = geneve->net;
struct geneve_net *gn = net_generic(net, geneve_net_id);
struct geneve_sock *gs;
__u32 hash;
gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->dst_port);
if (gs) {
gs->refcnt++;
goto out;
}
gs = geneve_socket_create(net, geneve->dst_port, ipv6);
if (IS_ERR(gs))
return PTR_ERR(gs);
out:
gs->collect_md = geneve->collect_md;
#if IS_ENABLED(CONFIG_IPV6)
if (ipv6)
geneve->sock6 = gs;
else
#endif
geneve->sock4 = gs;
hash = geneve_net_vni_hash(geneve->vni);
hlist_add_head_rcu(&geneve->hlist, &gs->vni_list[hash]);
return 0;
}
static int geneve_open(struct net_device *dev)
{
struct geneve_dev *geneve = netdev_priv(dev);
bool ipv6 = geneve->remote.sa.sa_family == AF_INET6;
bool metadata = geneve->collect_md;
int ret = 0;
geneve->sock4 = NULL;
#if IS_ENABLED(CONFIG_IPV6)
geneve->sock6 = NULL;
if (ipv6 || metadata)
ret = geneve_sock_add(geneve, true);
#endif
if (!ret && (!ipv6 || metadata))
ret = geneve_sock_add(geneve, false);
if (ret < 0)
geneve_sock_release(geneve);
return ret;
}
static int geneve_stop(struct net_device *dev)
{
struct geneve_dev *geneve = netdev_priv(dev);
if (!hlist_unhashed(&geneve->hlist))
hlist_del_rcu(&geneve->hlist);
geneve_sock_release(geneve);
return 0;
}
static void geneve_build_header(struct genevehdr *geneveh,
__be16 tun_flags, u8 vni[3],
u8 options_len, u8 *options)
{
geneveh->ver = GENEVE_VER;
geneveh->opt_len = options_len / 4;
geneveh->oam = !!(tun_flags & TUNNEL_OAM);
geneveh->critical = !!(tun_flags & TUNNEL_CRIT_OPT);
geneveh->rsvd1 = 0;
memcpy(geneveh->vni, vni, 3);
geneveh->proto_type = htons(ETH_P_TEB);
geneveh->rsvd2 = 0;
memcpy(geneveh->options, options, options_len);
}
static int geneve_build_skb(struct rtable *rt, struct sk_buff *skb,
__be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt,
bool csum, bool xnet)
{
struct genevehdr *gnvh;
int min_headroom;
int err;
skb_scrub_packet(skb, xnet);
min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
+ GENEVE_BASE_HLEN + opt_len + sizeof(struct iphdr);
err = skb_cow_head(skb, min_headroom);
if (unlikely(err)) {
kfree_skb(skb);
goto free_rt;
}
skb = udp_tunnel_handle_offloads(skb, csum);
if (IS_ERR(skb)) {
err = PTR_ERR(skb);
goto free_rt;
}
gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len);
geneve_build_header(gnvh, tun_flags, vni, opt_len, opt);
skb_set_inner_protocol(skb, htons(ETH_P_TEB));
return 0;
free_rt:
ip_rt_put(rt);
return err;
}
#if IS_ENABLED(CONFIG_IPV6)
static int geneve6_build_skb(struct dst_entry *dst, struct sk_buff *skb,
__be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt,
bool csum, bool xnet)
{
struct genevehdr *gnvh;
int min_headroom;
int err;
skb_scrub_packet(skb, xnet);
min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
+ GENEVE_BASE_HLEN + opt_len + sizeof(struct ipv6hdr);
err = skb_cow_head(skb, min_headroom);
if (unlikely(err)) {
kfree_skb(skb);
goto free_dst;
}
skb = udp_tunnel_handle_offloads(skb, csum);
if (IS_ERR(skb)) {
err = PTR_ERR(skb);
goto free_dst;
}
gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len);
geneve_build_header(gnvh, tun_flags, vni, opt_len, opt);
skb_set_inner_protocol(skb, htons(ETH_P_TEB));
return 0;
free_dst:
dst_release(dst);
return err;
}
#endif
static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
struct net_device *dev,
struct flowi4 *fl4,
struct ip_tunnel_info *info)
{
struct geneve_dev *geneve = netdev_priv(dev);
struct rtable *rt = NULL;
__u8 tos;
memset(fl4, 0, sizeof(*fl4));
fl4->flowi4_mark = skb->mark;
fl4->flowi4_proto = IPPROTO_UDP;
if (info) {
fl4->daddr = info->key.u.ipv4.dst;
fl4->saddr = info->key.u.ipv4.src;
fl4->flowi4_tos = RT_TOS(info->key.tos);
} else {
tos = geneve->tos;
if (tos == 1) {
const struct iphdr *iip = ip_hdr(skb);
tos = ip_tunnel_get_dsfield(iip, skb);
}
fl4->flowi4_tos = RT_TOS(tos);
fl4->daddr = geneve->remote.sin.sin_addr.s_addr;
}
rt = ip_route_output_key(geneve->net, fl4);
if (IS_ERR(rt)) {
netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr);
return ERR_PTR(-ENETUNREACH);
}
if (rt->dst.dev == dev) { /* is this necessary? */
netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr);
ip_rt_put(rt);
return ERR_PTR(-ELOOP);
}
return rt;
}
#if IS_ENABLED(CONFIG_IPV6)
static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
struct net_device *dev,
struct flowi6 *fl6,
struct ip_tunnel_info *info)
{
struct geneve_dev *geneve = netdev_priv(dev);
struct geneve_sock *gs6 = geneve->sock6;
struct dst_entry *dst = NULL;
__u8 prio;
memset(fl6, 0, sizeof(*fl6));
fl6->flowi6_mark = skb->mark;
fl6->flowi6_proto = IPPROTO_UDP;
if (info) {
fl6->daddr = info->key.u.ipv6.dst;
fl6->saddr = info->key.u.ipv6.src;
fl6->flowi6_tos = RT_TOS(info->key.tos);
} else {
prio = geneve->tos;
if (prio == 1) {
const struct iphdr *iip = ip_hdr(skb);
prio = ip_tunnel_get_dsfield(iip, skb);
}
fl6->flowi6_tos = RT_TOS(prio);
fl6->daddr = geneve->remote.sin6.sin6_addr;
}
if (ipv6_stub->ipv6_dst_lookup(geneve->net, gs6->sock->sk, &dst, fl6)) {
netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr);
return ERR_PTR(-ENETUNREACH);
}
if (dst->dev == dev) { /* is this necessary? */
netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr);
dst_release(dst);
return ERR_PTR(-ELOOP);
}
return dst;
}
#endif
/* Convert 64 bit tunnel ID to 24 bit VNI. */
static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni)
{
#ifdef __BIG_ENDIAN
vni[0] = (__force __u8)(tun_id >> 16);
vni[1] = (__force __u8)(tun_id >> 8);
vni[2] = (__force __u8)tun_id;
#else
vni[0] = (__force __u8)((__force u64)tun_id >> 40);
vni[1] = (__force __u8)((__force u64)tun_id >> 48);
vni[2] = (__force __u8)((__force u64)tun_id >> 56);
#endif
}
static netdev_tx_t geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
struct ip_tunnel_info *info)
{
struct geneve_dev *geneve = netdev_priv(dev);
struct geneve_sock *gs4 = geneve->sock4;
struct rtable *rt = NULL;
const struct iphdr *iip; /* interior IP header */
int err = -EINVAL;
struct flowi4 fl4;
__u8 tos, ttl;
__be16 sport;
bool udp_csum;
__be16 df;
bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
if (geneve->collect_md) {
if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
netdev_dbg(dev, "no tunnel metadata\n");
goto tx_error;
}
if (info && ip_tunnel_info_af(info) != AF_INET)
goto tx_error;
}
rt = geneve_get_v4_rt(skb, dev, &fl4, info);
if (IS_ERR(rt)) {
err = PTR_ERR(rt);
goto tx_error;
}
sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
skb_reset_mac_header(skb);
iip = ip_hdr(skb);
if (info) {
const struct ip_tunnel_key *key = &info->key;
u8 *opts = NULL;
u8 vni[3];
tunnel_id_to_vni(key->tun_id, vni);
if (key->tun_flags & TUNNEL_GENEVE_OPT)
opts = ip_tunnel_info_opts(info);
udp_csum = !!(key->tun_flags & TUNNEL_CSUM);
err = geneve_build_skb(rt, skb, key->tun_flags, vni,
info->options_len, opts, udp_csum, xnet);
if (unlikely(err))
goto err;
tos = ip_tunnel_ecn_encap(key->tos, iip, skb);
ttl = key->ttl;
df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
} else {
udp_csum = false;
err = geneve_build_skb(rt, skb, 0, geneve->vni,
0, NULL, udp_csum, xnet);
if (unlikely(err))
goto err;
tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, iip, skb);
ttl = geneve->ttl;
if (!ttl && IN_MULTICAST(ntohl(fl4.daddr)))
ttl = 1;
ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
df = 0;
}
err = udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
tos, ttl, df, sport, geneve->dst_port,
!net_eq(geneve->net, dev_net(geneve->dev)),
!udp_csum);
iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
return NETDEV_TX_OK;
tx_error:
dev_kfree_skb(skb);
err:
if (err == -ELOOP)
dev->stats.collisions++;
else if (err == -ENETUNREACH)
dev->stats.tx_carrier_errors++;
else
dev->stats.tx_errors++;
return NETDEV_TX_OK;
}
#if IS_ENABLED(CONFIG_IPV6)
static netdev_tx_t geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
struct ip_tunnel_info *info)
{
struct geneve_dev *geneve = netdev_priv(dev);
struct geneve_sock *gs6 = geneve->sock6;
struct dst_entry *dst = NULL;
const struct iphdr *iip; /* interior IP header */
int err = -EINVAL;
struct flowi6 fl6;
__u8 prio, ttl;
__be16 sport;
bool udp_csum;
bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
if (geneve->collect_md) {
if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
netdev_dbg(dev, "no tunnel metadata\n");
goto tx_error;
}
}
dst = geneve_get_v6_dst(skb, dev, &fl6, info);
if (IS_ERR(dst)) {
err = PTR_ERR(dst);
goto tx_error;
}
sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
skb_reset_mac_header(skb);
iip = ip_hdr(skb);
if (info) {
const struct ip_tunnel_key *key = &info->key;
u8 *opts = NULL;
u8 vni[3];
tunnel_id_to_vni(key->tun_id, vni);
if (key->tun_flags & TUNNEL_GENEVE_OPT)
opts = ip_tunnel_info_opts(info);
udp_csum = !!(key->tun_flags & TUNNEL_CSUM);
err = geneve6_build_skb(dst, skb, key->tun_flags, vni,
info->options_len, opts,
udp_csum, xnet);
if (unlikely(err))
goto err;
prio = ip_tunnel_ecn_encap(key->tos, iip, skb);
ttl = key->ttl;
} else {
udp_csum = false;
err = geneve6_build_skb(dst, skb, 0, geneve->vni,
0, NULL, udp_csum, xnet);
if (unlikely(err))
goto err;
prio = ip_tunnel_ecn_encap(fl6.flowi6_tos, iip, skb);
ttl = geneve->ttl;
if (!ttl && ipv6_addr_is_multicast(&fl6.daddr))
ttl = 1;
ttl = ttl ? : ip6_dst_hoplimit(dst);
}
err = udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
&fl6.saddr, &fl6.daddr, prio, ttl,
sport, geneve->dst_port, !udp_csum);
iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
return NETDEV_TX_OK;
tx_error:
dev_kfree_skb(skb);
err:
if (err == -ELOOP)
dev->stats.collisions++;
else if (err == -ENETUNREACH)
dev->stats.tx_carrier_errors++;
else
dev->stats.tx_errors++;
return NETDEV_TX_OK;
}
#endif
static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct geneve_dev *geneve = netdev_priv(dev);
struct ip_tunnel_info *info = NULL;
if (geneve->collect_md)
info = skb_tunnel_info(skb);
#if IS_ENABLED(CONFIG_IPV6)
if ((info && ip_tunnel_info_af(info) == AF_INET6) ||
(!info && geneve->remote.sa.sa_family == AF_INET6))
return geneve6_xmit_skb(skb, dev, info);
#endif
return geneve_xmit_skb(skb, dev, info);
}
static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
{
struct ip_tunnel_info *info = skb_tunnel_info(skb);
struct geneve_dev *geneve = netdev_priv(dev);
struct rtable *rt;
struct flowi4 fl4;
#if IS_ENABLED(CONFIG_IPV6)
struct dst_entry *dst;
struct flowi6 fl6;
#endif
if (ip_tunnel_info_af(info) == AF_INET) {
rt = geneve_get_v4_rt(skb, dev, &fl4, info);
if (IS_ERR(rt))
return PTR_ERR(rt);
ip_rt_put(rt);
info->key.u.ipv4.src = fl4.saddr;
#if IS_ENABLED(CONFIG_IPV6)
} else if (ip_tunnel_info_af(info) == AF_INET6) {
dst = geneve_get_v6_dst(skb, dev, &fl6, info);
if (IS_ERR(dst))
return PTR_ERR(dst);
dst_release(dst);
info->key.u.ipv6.src = fl6.saddr;
#endif
} else {
return -EINVAL;
}
info->key.tp_src = udp_flow_src_port(geneve->net, skb,
1, USHRT_MAX, true);
info->key.tp_dst = geneve->dst_port;
return 0;
}
static const struct net_device_ops geneve_netdev_ops = {
.ndo_init = geneve_init,
.ndo_uninit = geneve_uninit,
.ndo_open = geneve_open,
.ndo_stop = geneve_stop,
.ndo_start_xmit = geneve_xmit,
.ndo_get_stats64 = ip_tunnel_get_stats64,
.ndo_change_mtu = eth_change_mtu,
.ndo_validate_addr = eth_validate_addr,
.ndo_set_mac_address = eth_mac_addr,
.ndo_fill_metadata_dst = geneve_fill_metadata_dst,
};
static void geneve_get_drvinfo(struct net_device *dev,
struct ethtool_drvinfo *drvinfo)
{
strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version));
strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver));
}
static const struct ethtool_ops geneve_ethtool_ops = {
.get_drvinfo = geneve_get_drvinfo,
.get_link = ethtool_op_get_link,
};
/* Info for udev, that this is a virtual tunnel endpoint */
static struct device_type geneve_type = {
.name = "geneve",
};
/* Initialize the device structure. */
static void geneve_setup(struct net_device *dev)
{
ether_setup(dev);
dev->netdev_ops = &geneve_netdev_ops;
dev->ethtool_ops = &geneve_ethtool_ops;
dev->destructor = free_netdev;
SET_NETDEV_DEVTYPE(dev, &geneve_type);
dev->features |= NETIF_F_LLTX;
dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;
dev->features |= NETIF_F_RXCSUM;
dev->features |= NETIF_F_GSO_SOFTWARE;
dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
dev->hw_features |= NETIF_F_GSO_SOFTWARE;
netif_keep_dst(dev);
dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
eth_hw_addr_random(dev);
}
static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = {
[IFLA_GENEVE_ID] = { .type = NLA_U32 },
[IFLA_GENEVE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) },
[IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) },
[IFLA_GENEVE_TTL] = { .type = NLA_U8 },
[IFLA_GENEVE_TOS] = { .type = NLA_U8 },
[IFLA_GENEVE_PORT] = { .type = NLA_U16 },
[IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG },
};
static int geneve_validate(struct nlattr *tb[], struct nlattr *data[])
{
if (tb[IFLA_ADDRESS]) {
if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
return -EINVAL;
if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
return -EADDRNOTAVAIL;
}
if (!data)
return -EINVAL;
if (data[IFLA_GENEVE_ID]) {
__u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
if (vni >= GENEVE_VID_MASK)
return -ERANGE;
}
return 0;
}
static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
__be16 dst_port,
union geneve_addr *remote,
u8 vni[],
bool *tun_on_same_port,
bool *tun_collect_md)
{
struct geneve_dev *geneve, *t;
*tun_on_same_port = false;
*tun_collect_md = false;
t = NULL;
list_for_each_entry(geneve, &gn->geneve_list, next) {
if (geneve->dst_port == dst_port) {
*tun_collect_md = geneve->collect_md;
*tun_on_same_port = true;
}
if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) &&
!memcmp(remote, &geneve->remote, sizeof(geneve->remote)) &&
dst_port == geneve->dst_port)
t = geneve;
}
return t;
}
static int geneve_configure(struct net *net, struct net_device *dev,
union geneve_addr *remote,
__u32 vni, __u8 ttl, __u8 tos, __be16 dst_port,
bool metadata)
{
struct geneve_net *gn = net_generic(net, geneve_net_id);
struct geneve_dev *t, *geneve = netdev_priv(dev);
bool tun_collect_md, tun_on_same_port;
int err;
if (!remote)
return -EINVAL;
if (metadata &&
(remote->sa.sa_family != AF_UNSPEC || vni || tos || ttl))
return -EINVAL;
geneve->net = net;
geneve->dev = dev;
geneve->vni[0] = (vni & 0x00ff0000) >> 16;
geneve->vni[1] = (vni & 0x0000ff00) >> 8;
geneve->vni[2] = vni & 0x000000ff;
if ((remote->sa.sa_family == AF_INET &&
IN_MULTICAST(ntohl(remote->sin.sin_addr.s_addr))) ||
(remote->sa.sa_family == AF_INET6 &&
ipv6_addr_is_multicast(&remote->sin6.sin6_addr)))
return -EINVAL;
geneve->remote = *remote;
geneve->ttl = ttl;
geneve->tos = tos;
geneve->dst_port = dst_port;
geneve->collect_md = metadata;
t = geneve_find_dev(gn, dst_port, remote, geneve->vni,
&tun_on_same_port, &tun_collect_md);
if (t)
return -EBUSY;
if (metadata) {
if (tun_on_same_port)
return -EPERM;
} else {
if (tun_collect_md)
return -EPERM;
}
err = register_netdevice(dev);
if (err)
return err;
list_add(&geneve->next, &gn->geneve_list);
return 0;
}
static int geneve_newlink(struct net *net, struct net_device *dev,
struct nlattr *tb[], struct nlattr *data[])
{
__be16 dst_port = htons(GENEVE_UDP_PORT);
__u8 ttl = 0, tos = 0;
bool metadata = false;
union geneve_addr remote = geneve_remote_unspec;
__u32 vni = 0;
if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6])
return -EINVAL;
if (data[IFLA_GENEVE_REMOTE]) {
remote.sa.sa_family = AF_INET;
remote.sin.sin_addr.s_addr =
nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
}
if (data[IFLA_GENEVE_REMOTE6]) {
if (!IS_ENABLED(CONFIG_IPV6))
return -EPFNOSUPPORT;
remote.sa.sa_family = AF_INET6;
remote.sin6.sin6_addr =
nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
if (ipv6_addr_type(&remote.sin6.sin6_addr) &
IPV6_ADDR_LINKLOCAL) {
netdev_dbg(dev, "link-local remote is unsupported\n");
return -EINVAL;
}
}
if (data[IFLA_GENEVE_ID])
vni = nla_get_u32(data[IFLA_GENEVE_ID]);
if (data[IFLA_GENEVE_TTL])
ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
if (data[IFLA_GENEVE_TOS])
tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
if (data[IFLA_GENEVE_PORT])
dst_port = nla_get_be16(data[IFLA_GENEVE_PORT]);
if (data[IFLA_GENEVE_COLLECT_METADATA])
metadata = true;
return geneve_configure(net, dev, &remote, vni, ttl, tos, dst_port,
metadata);
}
static void geneve_dellink(struct net_device *dev, struct list_head *head)
{
struct geneve_dev *geneve = netdev_priv(dev);
list_del(&geneve->next);
unregister_netdevice_queue(dev, head);
}
static size_t geneve_get_size(const struct net_device *dev)
{
return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */
nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */
nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */
nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */
nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */
nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */
0;
}
static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
{
struct geneve_dev *geneve = netdev_priv(dev);
__u32 vni;
vni = (geneve->vni[0] << 16) | (geneve->vni[1] << 8) | geneve->vni[2];
if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
goto nla_put_failure;
if (geneve->remote.sa.sa_family == AF_INET) {
if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
geneve->remote.sin.sin_addr.s_addr))
goto nla_put_failure;
#if IS_ENABLED(CONFIG_IPV6)
} else {
if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
&geneve->remote.sin6.sin6_addr))
goto nla_put_failure;
#endif
}
if (nla_put_u8(skb, IFLA_GENEVE_TTL, geneve->ttl) ||
nla_put_u8(skb, IFLA_GENEVE_TOS, geneve->tos))
goto nla_put_failure;
if (nla_put_be16(skb, IFLA_GENEVE_PORT, geneve->dst_port))
goto nla_put_failure;
if (geneve->collect_md) {
if (nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
goto nla_put_failure;
}
return 0;
nla_put_failure:
return -EMSGSIZE;
}
static struct rtnl_link_ops geneve_link_ops __read_mostly = {
.kind = "geneve",
.maxtype = IFLA_GENEVE_MAX,
.policy = geneve_policy,
.priv_size = sizeof(struct geneve_dev),
.setup = geneve_setup,
.validate = geneve_validate,
.newlink = geneve_newlink,
.dellink = geneve_dellink,
.get_size = geneve_get_size,
.fill_info = geneve_fill_info,
};
struct net_device *geneve_dev_create_fb(struct net *net, const char *name,
u8 name_assign_type, u16 dst_port)
{
struct nlattr *tb[IFLA_MAX + 1];
struct net_device *dev;
int err;
memset(tb, 0, sizeof(tb));
dev = rtnl_create_link(net, name, name_assign_type,
&geneve_link_ops, tb);
if (IS_ERR(dev))
return dev;
err = geneve_configure(net, dev, &geneve_remote_unspec,
0, 0, 0, htons(dst_port), true);
if (err) {
free_netdev(dev);
return ERR_PTR(err);
}
return dev;
}
EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
static __net_init int geneve_init_net(struct net *net)
{
struct geneve_net *gn = net_generic(net, geneve_net_id);
INIT_LIST_HEAD(&gn->geneve_list);
INIT_LIST_HEAD(&gn->sock_list);
return 0;
}
static void __net_exit geneve_exit_net(struct net *net)
{
struct geneve_net *gn = net_generic(net, geneve_net_id);
struct geneve_dev *geneve, *next;
struct net_device *dev, *aux;
LIST_HEAD(list);
rtnl_lock();
/* gather any geneve devices that were moved into this ns */
for_each_netdev_safe(net, dev, aux)
if (dev->rtnl_link_ops == &geneve_link_ops)
unregister_netdevice_queue(dev, &list);
/* now gather any other geneve devices that were created in this ns */
list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) {
/* If geneve->dev is in the same netns, it was already added
* to the list by the previous loop.
*/
if (!net_eq(dev_net(geneve->dev), net))
unregister_netdevice_queue(geneve->dev, &list);
}
/* unregister the devices gathered above */
unregister_netdevice_many(&list);
rtnl_unlock();
}
static struct pernet_operations geneve_net_ops = {
.init = geneve_init_net,
.exit = geneve_exit_net,
.id = &geneve_net_id,
.size = sizeof(struct geneve_net),
};
static int __init geneve_init_module(void)
{
int rc;
rc = register_pernet_subsys(&geneve_net_ops);
if (rc)
goto out1;
rc = rtnl_link_register(&geneve_link_ops);
if (rc)
goto out2;
return 0;
out2:
unregister_pernet_subsys(&geneve_net_ops);
out1:
return rc;
}
late_initcall(geneve_init_module);
static void __exit geneve_cleanup_module(void)
{
rtnl_link_unregister(&geneve_link_ops);
unregister_pernet_subsys(&geneve_net_ops);
}
module_exit(geneve_cleanup_module);
MODULE_LICENSE("GPL");
MODULE_VERSION(GENEVE_NETDEV_VER);
MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>");
MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic");
MODULE_ALIAS_RTNL_LINK("geneve");