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linux-sg2042/drivers/net/geneve.c

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/*
* 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/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))
#define GENEVE_IPV4_HLEN (ETH_HLEN + sizeof(struct iphdr) + GENEVE_BASE_HLEN)
#define GENEVE_IPV6_HLEN (ETH_HLEN + sizeof(struct ipv6hdr) + GENEVE_BASE_HLEN)
/* per-network namespace private data for this module */
struct geneve_net {
struct list_head geneve_list;
struct list_head sock_list;
};
static unsigned int geneve_net_id;
struct geneve_dev_node {
struct hlist_node hlist;
struct geneve_dev *geneve;
};
/* Pseudo network device */
struct geneve_dev {
struct geneve_dev_node hlist4; /* vni hash table for IPv4 socket */
#if IS_ENABLED(CONFIG_IPV6)
struct geneve_dev_node hlist6; /* vni hash table for IPv6 socket */
#endif
struct net *net; /* netns for packet i/o */
struct net_device *dev; /* netdev for geneve tunnel */
struct ip_tunnel_info info;
struct geneve_sock __rcu *sock4; /* IPv4 socket used for geneve tunnel */
#if IS_ENABLED(CONFIG_IPV6)
struct geneve_sock __rcu *sock6; /* IPv6 socket used for geneve tunnel */
#endif
struct list_head next; /* geneve's per namespace list */
struct gro_cells gro_cells;
bool collect_md;
bool use_udp6_rx_checksums;
};
struct geneve_sock {
bool collect_md;
struct list_head list;
struct socket *sock;
struct rcu_head rcu;
int refcnt;
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
}
/* 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 bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni)
{
return !memcmp(vni, &tun_id[5], 3);
}
static sa_family_t geneve_get_sk_family(struct geneve_sock *gs)
{
return gs->sock->sk->sk_family;
}
static struct geneve_dev *geneve_lookup(struct geneve_sock *gs,
__be32 addr, u8 vni[])
{
struct hlist_head *vni_list_head;
struct geneve_dev_node *node;
__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(node, vni_list_head, hlist) {
if (eq_tun_id_and_vni((u8 *)&node->geneve->info.key.tun_id, vni) &&
addr == node->geneve->info.key.u.ipv4.dst)
return node->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_node *node;
__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(node, vni_list_head, hlist) {
if (eq_tun_id_and_vni((u8 *)&node->geneve->info.key.tun_id, vni) &&
ipv6_addr_equal(&addr6, &node->geneve->info.key.u.ipv6.dst))
return node->geneve;
}
return NULL;
}
#endif
static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
{
return (struct genevehdr *)(udp_hdr(skb) + 1);
}
static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs,
struct sk_buff *skb)
{
static u8 zero_vni[3];
u8 *vni;
if (geneve_get_sk_family(gs) == AF_INET) {
struct iphdr *iph;
__be32 addr;
iph = ip_hdr(skb); /* outer IP header... */
if (gs->collect_md) {
vni = zero_vni;
addr = 0;
} else {
vni = geneve_hdr(skb)->vni;
addr = iph->saddr;
}
return geneve_lookup(gs, addr, vni);
#if IS_ENABLED(CONFIG_IPV6)
} else if (geneve_get_sk_family(gs) == AF_INET6) {
static struct in6_addr zero_addr6;
struct ipv6hdr *ip6h;
struct in6_addr addr6;
ip6h = ipv6_hdr(skb); /* outer IPv6 header... */
if (gs->collect_md) {
vni = zero_vni;
addr6 = zero_addr6;
} else {
vni = geneve_hdr(skb)->vni;
addr6 = ip6h->saddr;
}
return geneve6_lookup(gs, addr6, vni);
#endif
}
return NULL;
}
/* geneve receive/decap routine */
static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs,
struct sk_buff *skb)
{
struct genevehdr *gnvh = geneve_hdr(skb);
struct metadata_dst *tun_dst = NULL;
struct pcpu_sw_netstats *stats;
unsigned int len;
int err = 0;
void *oiph;
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, geneve_get_sk_family(gs), flags,
vni_to_tunnel_id(gnvh->vni),
gnvh->opt_len * 4);
if (!tun_dst) {
geneve->dev->stats.rx_dropped++;
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) {
geneve->dev->stats.rx_frame_errors++;
geneve->dev->stats.rx_errors++;
goto drop;
}
}
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;
}
oiph = skb_network_header(skb);
skb_reset_network_header(skb);
if (geneve_get_sk_family(gs) == AF_INET)
err = IP_ECN_decapsulate(oiph, skb);
#if IS_ENABLED(CONFIG_IPV6)
else
err = IP6_ECN_decapsulate(oiph, skb);
#endif
if (unlikely(err)) {
if (log_ecn_error) {
if (geneve_get_sk_family(gs) == AF_INET)
net_info_ratelimited("non-ECT from %pI4 "
"with TOS=%#x\n",
&((struct iphdr *)oiph)->saddr,
((struct iphdr *)oiph)->tos);
#if IS_ENABLED(CONFIG_IPV6)
else
net_info_ratelimited("non-ECT from %pI6\n",
&((struct ipv6hdr *)oiph)->saddr);
#endif
}
if (err > 1) {
++geneve->dev->stats.rx_frame_errors;
++geneve->dev->stats.rx_errors;
goto drop;
}
}
len = skb->len;
err = gro_cells_receive(&geneve->gro_cells, skb);
if (likely(err == NET_RX_SUCCESS)) {
stats = this_cpu_ptr(geneve->dev->tstats);
u64_stats_update_begin(&stats->syncp);
stats->rx_packets++;
stats->rx_bytes += len;
u64_stats_update_end(&stats->syncp);
}
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;
}
err = dst_cache_init(&geneve->info.dst_cache, GFP_KERNEL);
if (err) {
free_percpu(dev->tstats);
gro_cells_destroy(&geneve->gro_cells);
return err;
}
return 0;
}
static void geneve_uninit(struct net_device *dev)
{
struct geneve_dev *geneve = netdev_priv(dev);
dst_cache_destroy(&geneve->info.dst_cache);
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_dev *geneve;
struct geneve_sock *gs;
int opts_len;
/* Need UDP and Geneve header to be present */
if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
goto drop;
/* Return packets with reserved bits set */
geneveh = geneve_hdr(skb);
if (unlikely(geneveh->ver != GENEVE_VER))
goto drop;
if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
goto drop;
gs = rcu_dereference_sk_user_data(sk);
if (!gs)
goto drop;
geneve = geneve_lookup_skb(gs, skb);
if (!geneve)
goto drop;
opts_len = geneveh->opt_len * 4;
if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
htons(ETH_P_TEB),
!net_eq(geneve->net, dev_net(geneve->dev)))) {
geneve->dev->stats.rx_dropped++;
goto drop;
}
geneve_rx(geneve, gs, skb);
return 0;
drop:
/* Consume bad packet */
kfree_skb(skb);
return 0;
}
static struct socket *geneve_create_sock(struct net *net, bool ipv6,
__be16 port, bool ipv6_rx_csum)
{
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;
udp_conf.use_udp6_rx_checksums = ipv6_rx_csum;
} 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 int geneve_hlen(struct genevehdr *gh)
{
return sizeof(*gh) + gh->opt_len * 4;
}
static struct sk_buff **geneve_gro_receive(struct sock *sk,
struct sk_buff **head,
struct sk_buff *skb)
{
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;
}
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)
goto out_unlock;
skb_gro_pull(skb, gh_len);
skb_gro_postpull_rcsum(skb, gh, gh_len);
pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
flush = 0;
out_unlock:
rcu_read_unlock();
out:
NAPI_GRO_CB(skb)->flush |= flush;
return pp;
}
static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb,
int nhoff)
{
struct genevehdr *gh;
struct packet_offload *ptype;
__be16 type;
int gh_len;
int err = -ENOSYS;
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();
skb_set_inner_mac_header(skb, nhoff + gh_len);
return err;
}
/* Create new listen socket if needed */
static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
bool ipv6, bool ipv6_rx_csum)
{
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, ipv6_rx_csum);
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 */
udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
/* Mark socket as an encapsulation socket */
memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
tunnel_cfg.sk_user_data = gs;
tunnel_cfg.encap_type = 1;
tunnel_cfg.gro_receive = geneve_gro_receive;
tunnel_cfg.gro_complete = geneve_gro_complete;
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_sock_release(struct geneve_sock *gs)
{
if (!gs || --gs->refcnt)
return;
list_del(&gs->list);
udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE);
udp_tunnel_sock_release(gs->sock);
kfree_rcu(gs, rcu);
}
static void geneve_sock_release(struct geneve_dev *geneve)
{
struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4);
#if IS_ENABLED(CONFIG_IPV6)
struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6);
rcu_assign_pointer(geneve->sock6, NULL);
#endif
rcu_assign_pointer(geneve->sock4, NULL);
synchronize_net();
__geneve_sock_release(gs4);
#if IS_ENABLED(CONFIG_IPV6)
__geneve_sock_release(gs6);
#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 &&
geneve_get_sk_family(gs) == 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_dev_node *node;
struct geneve_sock *gs;
__u8 vni[3];
__u32 hash;
gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->info.key.tp_dst);
if (gs) {
gs->refcnt++;
goto out;
}
gs = geneve_socket_create(net, geneve->info.key.tp_dst, ipv6,
geneve->use_udp6_rx_checksums);
if (IS_ERR(gs))
return PTR_ERR(gs);
out:
gs->collect_md = geneve->collect_md;
#if IS_ENABLED(CONFIG_IPV6)
if (ipv6) {
rcu_assign_pointer(geneve->sock6, gs);
node = &geneve->hlist6;
} else
#endif
{
rcu_assign_pointer(geneve->sock4, gs);
node = &geneve->hlist4;
}
node->geneve = geneve;
tunnel_id_to_vni(geneve->info.key.tun_id, vni);
hash = geneve_net_vni_hash(vni);
hlist_add_head_rcu(&node->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->info.mode & IP_TUNNEL_INFO_IPV6);
bool metadata = geneve->collect_md;
int ret = 0;
#if IS_ENABLED(CONFIG_IPV6)
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);
hlist_del_init_rcu(&geneve->hlist4.hlist);
#if IS_ENABLED(CONFIG_IPV6)
hlist_del_init_rcu(&geneve->hlist6.hlist);
#endif
geneve_sock_release(geneve);
return 0;
}
static void geneve_build_header(struct genevehdr *geneveh,
const struct ip_tunnel_info *info)
{
geneveh->ver = GENEVE_VER;
geneveh->opt_len = info->options_len / 4;
geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM);
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->rsvd2 = 0;
ip_tunnel_info_opts_get(geneveh->options, info);
}
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 udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
struct genevehdr *gnvh;
int min_headroom;
int err;
skb_reset_mac_header(skb);
skb_scrub_packet(skb, xnet);
min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len +
GENEVE_BASE_HLEN + info->options_len + ip_hdr_len;
err = skb_cow_head(skb, min_headroom);
if (unlikely(err))
goto free_dst;
err = udp_tunnel_handle_offloads(skb, udp_sum);
if (err)
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));
return 0;
free_dst:
dst_release(dst);
return err;
}
static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
struct net_device *dev,
struct geneve_sock *gs4,
struct flowi4 *fl4,
const struct ip_tunnel_info *info)
{
bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
struct geneve_dev *geneve = netdev_priv(dev);
struct dst_cache *dst_cache;
struct rtable *rt = NULL;
__u8 tos;
if (!gs4)
return ERR_PTR(-EIO);
memset(fl4, 0, sizeof(*fl4));
fl4->flowi4_mark = skb->mark;
fl4->flowi4_proto = IPPROTO_UDP;
fl4->daddr = info->key.u.ipv4.dst;
fl4->saddr = info->key.u.ipv4.src;
tos = info->key.tos;
if ((tos == 1) && !geneve->collect_md) {
tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
use_cache = false;
}
fl4->flowi4_tos = RT_TOS(tos);
dst_cache = (struct dst_cache *)&info->dst_cache;
if (use_cache) {
rt = dst_cache_get_ip4(dst_cache, &fl4->saddr);
if (rt)
return rt;
}
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);
}
if (use_cache)
dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr);
return rt;
}
#if IS_ENABLED(CONFIG_IPV6)
static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb,
struct net_device *dev,
struct geneve_sock *gs6,
struct flowi6 *fl6,
const struct ip_tunnel_info *info)
{
bool use_cache = ip_tunnel_dst_cache_usable(skb, info);
struct geneve_dev *geneve = netdev_priv(dev);
struct dst_entry *dst = NULL;
struct dst_cache *dst_cache;
__u8 prio;
if (!gs6)
return ERR_PTR(-EIO);
memset(fl6, 0, sizeof(*fl6));
fl6->flowi6_mark = skb->mark;
fl6->flowi6_proto = IPPROTO_UDP;
fl6->daddr = info->key.u.ipv6.dst;
fl6->saddr = info->key.u.ipv6.src;
prio = info->key.tos;
if ((prio == 1) && !geneve->collect_md) {
prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb);
use_cache = false;
}
fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio),
info->key.label);
dst_cache = (struct dst_cache *)&info->dst_cache;
if (use_cache) {
dst = dst_cache_get_ip6(dst_cache, &fl6->saddr);
if (dst)
return dst;
}
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);
}
if (use_cache)
dst_cache_set_ip6(dst_cache, dst, &fl6->saddr);
return dst;
}
#endif
static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
struct geneve_dev *geneve,
const struct ip_tunnel_info *info)
{
bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
const struct ip_tunnel_key *key = &info->key;
struct rtable *rt;
struct flowi4 fl4;
__u8 tos, ttl;
__be16 sport;
__be16 df;
int err;
rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info);
if (IS_ERR(rt))
return PTR_ERR(rt);
if (skb_dst(skb)) {
int mtu = dst_mtu(&rt->dst) - GENEVE_IPV4_HLEN -
info->options_len;
skb_dst_update_pmtu(skb, mtu);
}
sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
if (geneve->collect_md) {
tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
ttl = key->ttl;
} else {
tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, ip_hdr(skb), skb);
ttl = key->ttl ? : ip4_dst_hoplimit(&rt->dst);
}
df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr));
if (unlikely(err))
return err;
udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr,
tos, ttl, df, sport, geneve->info.key.tp_dst,
!net_eq(geneve->net, dev_net(geneve->dev)),
!(info->key.tun_flags & TUNNEL_CSUM));
return 0;
}
#if IS_ENABLED(CONFIG_IPV6)
static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
struct geneve_dev *geneve,
const struct ip_tunnel_info *info)
{
bool xnet = !net_eq(geneve->net, dev_net(geneve->dev));
struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
const struct ip_tunnel_key *key = &info->key;
struct dst_entry *dst = NULL;
struct flowi6 fl6;
__u8 prio, ttl;
__be16 sport;
int err;
dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info);
if (IS_ERR(dst))
return PTR_ERR(dst);
if (skb_dst(skb)) {
int mtu = dst_mtu(dst) - GENEVE_IPV6_HLEN - info->options_len;
skb_dst_update_pmtu(skb, mtu);
}
sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
if (geneve->collect_md) {
prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
ttl = key->ttl;
} else {
prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel),
ip_hdr(skb), skb);
ttl = key->ttl ? : ip6_dst_hoplimit(dst);
}
err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr));
if (unlikely(err))
return err;
udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev,
&fl6.saddr, &fl6.daddr, prio, ttl,
info->key.label, sport, geneve->info.key.tp_dst,
!(info->key.tun_flags & TUNNEL_CSUM));
return 0;
}
#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;
int err;
if (geneve->collect_md) {
info = skb_tunnel_info(skb);
if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) {
err = -EINVAL;
netdev_dbg(dev, "no tunnel metadata\n");
goto tx_error;
}
} else {
info = &geneve->info;
}
rcu_read_lock();
#if IS_ENABLED(CONFIG_IPV6)
if (info->mode & IP_TUNNEL_INFO_IPV6)
err = geneve6_xmit_skb(skb, dev, geneve, info);
else
#endif
err = geneve_xmit_skb(skb, dev, geneve, info);
rcu_read_unlock();
if (likely(!err))
return NETDEV_TX_OK;
tx_error:
dev_kfree_skb(skb);
if (err == -ELOOP)
dev->stats.collisions++;
else if (err == -ENETUNREACH)
dev->stats.tx_carrier_errors++;
dev->stats.tx_errors++;
return NETDEV_TX_OK;
}
static int geneve_change_mtu(struct net_device *dev, int new_mtu)
{
if (new_mtu > dev->max_mtu)
new_mtu = dev->max_mtu;
else if (new_mtu < dev->min_mtu)
new_mtu = dev->min_mtu;
dev->mtu = new_mtu;
return 0;
}
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);
if (ip_tunnel_info_af(info) == AF_INET) {
struct rtable *rt;
struct flowi4 fl4;
struct geneve_sock *gs4 = rcu_dereference(geneve->sock4);
rt = geneve_get_v4_rt(skb, dev, gs4, &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) {
struct dst_entry *dst;
struct flowi6 fl6;
struct geneve_sock *gs6 = rcu_dereference(geneve->sock6);
dst = geneve_get_v6_dst(skb, dev, gs6, &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->info.key.tp_dst;
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 = geneve_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",
};
/* Calls the ndo_udp_tunnel_add of the caller in order to
* supply the listening GENEVE udp ports. Callers are expected
* to implement the ndo_udp_tunnel_add.
*/
static void geneve_offload_rx_ports(struct net_device *dev, bool push)
{
struct net *net = dev_net(dev);
struct geneve_net *gn = net_generic(net, geneve_net_id);
struct geneve_sock *gs;
rcu_read_lock();
list_for_each_entry_rcu(gs, &gn->sock_list, list) {
if (push) {
udp_tunnel_push_rx_port(dev, gs->sock,
UDP_TUNNEL_TYPE_GENEVE);
} else {
udp_tunnel_drop_rx_port(dev, gs->sock,
UDP_TUNNEL_TYPE_GENEVE);
}
}
rcu_read_unlock();
}
/* 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->needs_free_netdev = true;
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;
/* MTU range: 68 - (something less than 65535) */
dev->min_mtu = ETH_MIN_MTU;
/* The max_mtu calculation does not take account of GENEVE
* options, to avoid excluding potentially valid
* configurations. This will be further reduced by IPvX hdr size.
*/
dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len;
netif_keep_dst(dev);
dev->priv_flags &= ~IFF_TX_SKB_SHARING;
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_LABEL] = { .type = NLA_U32 },
[IFLA_GENEVE_PORT] = { .type = NLA_U16 },
[IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG },
[IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 },
[IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 },
[IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 },
};
static int geneve_validate(struct nlattr *tb[], struct nlattr *data[],
struct netlink_ext_ack *extack)
{
if (tb[IFLA_ADDRESS]) {
if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
"Provided link layer address is not Ethernet");
return -EINVAL;
}
if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS],
"Provided Ethernet address is not unicast");
return -EADDRNOTAVAIL;
}
}
if (!data) {
NL_SET_ERR_MSG(extack,
"Not enough attributes provided to perform the operation");
return -EINVAL;
}
if (data[IFLA_GENEVE_ID]) {
__u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]);
if (vni >= GENEVE_N_VID) {
NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID],
"Geneve ID must be lower than 16777216");
return -ERANGE;
}
}
return 0;
}
static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
const struct ip_tunnel_info *info,
bool *tun_on_same_port,
bool *tun_collect_md)
{
struct geneve_dev *geneve, *t = NULL;
*tun_on_same_port = false;
*tun_collect_md = false;
list_for_each_entry(geneve, &gn->geneve_list, next) {
if (info->key.tp_dst == geneve->info.key.tp_dst) {
*tun_collect_md = geneve->collect_md;
*tun_on_same_port = true;
}
if (info->key.tun_id == geneve->info.key.tun_id &&
info->key.tp_dst == geneve->info.key.tp_dst &&
!memcmp(&info->key.u, &geneve->info.key.u, sizeof(info->key.u)))
t = geneve;
}
return t;
}
static bool is_tnl_info_zero(const struct ip_tunnel_info *info)
{
return !(info->key.tun_id || info->key.tun_flags || info->key.tos ||
info->key.ttl || info->key.label || info->key.tp_src ||
memchr_inv(&info->key.u, 0, sizeof(info->key.u)));
}
static bool geneve_dst_addr_equal(struct ip_tunnel_info *a,
struct ip_tunnel_info *b)
{
if (ip_tunnel_info_af(a) == AF_INET)
return a->key.u.ipv4.dst == b->key.u.ipv4.dst;
else
return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst);
}
static int geneve_configure(struct net *net, struct net_device *dev,
struct netlink_ext_ack *extack,
const struct ip_tunnel_info *info,
bool metadata, bool ipv6_rx_csum)
{
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, encap_len;
if (metadata && !is_tnl_info_zero(info)) {
NL_SET_ERR_MSG(extack,
"Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified");
return -EINVAL;
}
geneve->net = net;
geneve->dev = dev;
t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md);
if (t)
return -EBUSY;
/* make enough headroom for basic scenario */
encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
encap_len += sizeof(struct iphdr);
dev->max_mtu -= sizeof(struct iphdr);
} else {
encap_len += sizeof(struct ipv6hdr);
dev->max_mtu -= sizeof(struct ipv6hdr);
}
dev->needed_headroom = encap_len + ETH_HLEN;
if (metadata) {
if (tun_on_same_port) {
NL_SET_ERR_MSG(extack,
"There can be only one externally controlled device on a destination port");
return -EPERM;
}
} else {
if (tun_collect_md) {
NL_SET_ERR_MSG(extack,
"There already exists an externally controlled device on this destination port");
return -EPERM;
}
}
dst_cache_reset(&geneve->info.dst_cache);
geneve->info = *info;
geneve->collect_md = metadata;
geneve->use_udp6_rx_checksums = ipv6_rx_csum;
err = register_netdevice(dev);
if (err)
return err;
list_add(&geneve->next, &gn->geneve_list);
return 0;
}
static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port)
{
memset(info, 0, sizeof(*info));
info->key.tp_dst = htons(dst_port);
}
static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[],
struct netlink_ext_ack *extack,
struct ip_tunnel_info *info, bool *metadata,
bool *use_udp6_rx_checksums, bool changelink)
{
int attrtype;
if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) {
NL_SET_ERR_MSG(extack,
"Cannot specify both IPv4 and IPv6 Remote addresses");
return -EINVAL;
}
if (data[IFLA_GENEVE_REMOTE]) {
if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) {
attrtype = IFLA_GENEVE_REMOTE;
goto change_notsup;
}
info->key.u.ipv4.dst =
nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
if (IN_MULTICAST(ntohl(info->key.u.ipv4.dst))) {
NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE],
"Remote IPv4 address cannot be Multicast");
return -EINVAL;
}
}
if (data[IFLA_GENEVE_REMOTE6]) {
#if IS_ENABLED(CONFIG_IPV6)
if (changelink && (ip_tunnel_info_af(info) == AF_INET)) {
attrtype = IFLA_GENEVE_REMOTE6;
goto change_notsup;
}
info->mode = IP_TUNNEL_INFO_IPV6;
info->key.u.ipv6.dst =
nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);
if (ipv6_addr_type(&info->key.u.ipv6.dst) &
IPV6_ADDR_LINKLOCAL) {
NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
"Remote IPv6 address cannot be link-local");
return -EINVAL;
}
if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) {
NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
"Remote IPv6 address cannot be Multicast");
return -EINVAL;
}
info->key.tun_flags |= TUNNEL_CSUM;
*use_udp6_rx_checksums = true;
#else
NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6],
"IPv6 support not enabled in the kernel");
return -EPFNOSUPPORT;
#endif
}
if (data[IFLA_GENEVE_ID]) {
__u32 vni;
__u8 tvni[3];
__be64 tunid;
vni = nla_get_u32(data[IFLA_GENEVE_ID]);
tvni[0] = (vni & 0x00ff0000) >> 16;
tvni[1] = (vni & 0x0000ff00) >> 8;
tvni[2] = vni & 0x000000ff;
tunid = vni_to_tunnel_id(tvni);
if (changelink && (tunid != info->key.tun_id)) {
attrtype = IFLA_GENEVE_ID;
goto change_notsup;
}
info->key.tun_id = tunid;
}
if (data[IFLA_GENEVE_TTL])
info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]);
if (data[IFLA_GENEVE_TOS])
info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]);
if (data[IFLA_GENEVE_LABEL]) {
info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) &
IPV6_FLOWLABEL_MASK;
if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) {
NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL],
"Label attribute only applies for IPv6 Geneve devices");
return -EINVAL;
}
}
if (data[IFLA_GENEVE_PORT]) {
if (changelink) {
attrtype = IFLA_GENEVE_PORT;
goto change_notsup;
}
info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]);
}
if (data[IFLA_GENEVE_COLLECT_METADATA]) {
if (changelink) {
attrtype = IFLA_GENEVE_COLLECT_METADATA;
goto change_notsup;
}
*metadata = true;
}
if (data[IFLA_GENEVE_UDP_CSUM]) {
if (changelink) {
attrtype = IFLA_GENEVE_UDP_CSUM;
goto change_notsup;
}
if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM]))
info->key.tun_flags |= TUNNEL_CSUM;
}
if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) {
#if IS_ENABLED(CONFIG_IPV6)
if (changelink) {
attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX;
goto change_notsup;
}
if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]))
info->key.tun_flags &= ~TUNNEL_CSUM;
#else
NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX],
"IPv6 support not enabled in the kernel");
return -EPFNOSUPPORT;
#endif
}
if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) {
#if IS_ENABLED(CONFIG_IPV6)
if (changelink) {
attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX;
goto change_notsup;
}
if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]))
*use_udp6_rx_checksums = false;
#else
NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX],
"IPv6 support not enabled in the kernel");
return -EPFNOSUPPORT;
#endif
}
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");
return -EOPNOTSUPP;
}
static void geneve_link_config(struct net_device *dev,
struct ip_tunnel_info *info, struct nlattr *tb[])
{
struct geneve_dev *geneve = netdev_priv(dev);
int ldev_mtu = 0;
if (tb[IFLA_MTU]) {
geneve_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
return;
}
switch (ip_tunnel_info_af(info)) {
case AF_INET: {
struct flowi4 fl4 = { .daddr = info->key.u.ipv4.dst };
struct rtable *rt = ip_route_output_key(geneve->net, &fl4);
if (!IS_ERR(rt) && rt->dst.dev) {
ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV4_HLEN;
ip_rt_put(rt);
}
break;
}
#if IS_ENABLED(CONFIG_IPV6)
case AF_INET6: {
struct rt6_info *rt = rt6_lookup(geneve->net,
&info->key.u.ipv6.dst, NULL, 0,
NULL, 0);
if (rt && rt->dst.dev)
ldev_mtu = rt->dst.dev->mtu - GENEVE_IPV6_HLEN;
ip6_rt_put(rt);
break;
}
#endif
}
if (ldev_mtu <= 0)
return;
geneve_change_mtu(dev, ldev_mtu - info->options_len);
}
static int geneve_newlink(struct net *net, struct net_device *dev,
struct nlattr *tb[], struct nlattr *data[],
struct netlink_ext_ack *extack)
{
bool use_udp6_rx_checksums = false;
struct ip_tunnel_info info;
bool metadata = false;
int err;
init_tnl_info(&info, GENEVE_UDP_PORT);
err = geneve_nl2info(tb, data, extack, &info, &metadata,
&use_udp6_rx_checksums, false);
if (err)
return err;
err = geneve_configure(net, dev, extack, &info, metadata,
use_udp6_rx_checksums);
if (err)
return err;
geneve_link_config(dev, &info, tb);
return 0;
}
/* Quiesces the geneve device data path for both TX and RX.
*
* On transmit geneve checks for non-NULL geneve_sock before it proceeds.
* So, if we set that socket to NULL under RCU and wait for synchronize_net()
* to complete for the existing set of in-flight packets to be transmitted,
* then we would have quiesced the transmit data path. All the future packets
* will get dropped until we unquiesce the data path.
*
* On receive geneve dereference the geneve_sock stashed in the socket. So,
* if we set that to NULL under RCU and wait for synchronize_net() to
* complete, then we would have quiesced the receive data path.
*/
static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4,
struct geneve_sock **gs6)
{
*gs4 = rtnl_dereference(geneve->sock4);
rcu_assign_pointer(geneve->sock4, NULL);
if (*gs4)
rcu_assign_sk_user_data((*gs4)->sock->sk, NULL);
#if IS_ENABLED(CONFIG_IPV6)
*gs6 = rtnl_dereference(geneve->sock6);
rcu_assign_pointer(geneve->sock6, NULL);
if (*gs6)
rcu_assign_sk_user_data((*gs6)->sock->sk, NULL);
#else
*gs6 = NULL;
#endif
synchronize_net();
}
/* Resumes the geneve device data path for both TX and RX. */
static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4,
struct geneve_sock __maybe_unused *gs6)
{
rcu_assign_pointer(geneve->sock4, gs4);
if (gs4)
rcu_assign_sk_user_data(gs4->sock->sk, gs4);
#if IS_ENABLED(CONFIG_IPV6)
rcu_assign_pointer(geneve->sock6, gs6);
if (gs6)
rcu_assign_sk_user_data(gs6->sock->sk, gs6);
#endif
synchronize_net();
}
static int geneve_changelink(struct net_device *dev, struct nlattr *tb[],
struct nlattr *data[],
struct netlink_ext_ack *extack)
{
struct geneve_dev *geneve = netdev_priv(dev);
struct geneve_sock *gs4, *gs6;
struct ip_tunnel_info info;
bool metadata;
bool use_udp6_rx_checksums;
int err;
/* If the geneve device is configured for metadata (or externally
* controlled, for example, OVS), then nothing can be changed.
*/
if (geneve->collect_md)
return -EOPNOTSUPP;
/* Start with the existing info. */
memcpy(&info, &geneve->info, sizeof(info));
metadata = geneve->collect_md;
use_udp6_rx_checksums = geneve->use_udp6_rx_checksums;
err = geneve_nl2info(tb, data, extack, &info, &metadata,
&use_udp6_rx_checksums, true);
if (err)
return err;
if (!geneve_dst_addr_equal(&geneve->info, &info)) {
dst_cache_reset(&info.dst_cache);
geneve_link_config(dev, &info, tb);
}
geneve_quiesce(geneve, &gs4, &gs6);
geneve->info = info;
geneve->collect_md = metadata;
geneve->use_udp6_rx_checksums = use_udp6_rx_checksums;
geneve_unquiesce(geneve, gs4, gs6);
return 0;
}
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(__be32)) + /* IFLA_GENEVE_LABEL */
nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */
nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */
nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */
nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */
nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */
0;
}
static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev)
{
struct geneve_dev *geneve = netdev_priv(dev);
struct ip_tunnel_info *info = &geneve->info;
bool metadata = geneve->collect_md;
__u8 tmp_vni[3];
__u32 vni;
tunnel_id_to_vni(info->key.tun_id, tmp_vni);
vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2];
if (nla_put_u32(skb, IFLA_GENEVE_ID, vni))
goto nla_put_failure;
if (!metadata && ip_tunnel_info_af(info) == AF_INET) {
if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE,
info->key.u.ipv4.dst))
goto nla_put_failure;
if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM,
!!(info->key.tun_flags & TUNNEL_CSUM)))
goto nla_put_failure;
#if IS_ENABLED(CONFIG_IPV6)
} else if (!metadata) {
if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6,
&info->key.u.ipv6.dst))
goto nla_put_failure;
if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX,
!(info->key.tun_flags & TUNNEL_CSUM)))
goto nla_put_failure;
#endif
}
if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) ||
nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) ||
nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label))
goto nla_put_failure;
if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst))
goto nla_put_failure;
if (metadata && nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA))
goto nla_put_failure;
#if IS_ENABLED(CONFIG_IPV6)
if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX,
!geneve->use_udp6_rx_checksums))
goto nla_put_failure;
#endif
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,
.changelink = geneve_changelink,
.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 ip_tunnel_info info;
struct net_device *dev;
LIST_HEAD(list_kill);
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;
init_tnl_info(&info, dst_port);
err = geneve_configure(net, dev, NULL, &info, true, true);
if (err) {
free_netdev(dev);
return ERR_PTR(err);
}
/* openvswitch users expect packet sizes to be unrestricted,
* so set the largest MTU we can.
*/
err = geneve_change_mtu(dev, IP_MAX_MTU);
if (err)
goto err;
err = rtnl_configure_link(dev, NULL);
if (err < 0)
goto err;
return dev;
err:
geneve_dellink(dev, &list_kill);
unregister_netdevice_many(&list_kill);
return ERR_PTR(err);
}
EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
static int geneve_netdevice_event(struct notifier_block *unused,
unsigned long event, void *ptr)
{
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
if (event == NETDEV_UDP_TUNNEL_PUSH_INFO ||
event == NETDEV_UDP_TUNNEL_DROP_INFO) {
geneve_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO);
} else if (event == NETDEV_UNREGISTER) {
geneve_offload_rx_ports(dev, false);
} else if (event == NETDEV_REGISTER) {
geneve_offload_rx_ports(dev, true);
}
return NOTIFY_DONE;
}
static struct notifier_block geneve_notifier_block __read_mostly = {
.notifier_call = geneve_netdevice_event,
};
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 geneve_destroy_tunnels(struct net *net, struct list_head *head)
{
struct geneve_net *gn = net_generic(net, geneve_net_id);
struct geneve_dev *geneve, *next;
struct net_device *dev, *aux;
/* 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, head);
/* 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, head);
}
WARN_ON_ONCE(!list_empty(&gn->sock_list));
}
static void __net_exit geneve_exit_batch_net(struct list_head *net_list)
{
struct net *net;
LIST_HEAD(list);
rtnl_lock();
list_for_each_entry(net, net_list, exit_list)
geneve_destroy_tunnels(net, &list);
/* unregister the devices gathered above */
unregister_netdevice_many(&list);
rtnl_unlock();
}
static struct pernet_operations geneve_net_ops = {
.init = geneve_init_net,
.exit_batch = geneve_exit_batch_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 = register_netdevice_notifier(&geneve_notifier_block);
if (rc)
goto out2;
rc = rtnl_link_register(&geneve_link_ops);
if (rc)
goto out3;
return 0;
out3:
unregister_netdevice_notifier(&geneve_notifier_block);
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_netdevice_notifier(&geneve_notifier_block);
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");
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