mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
1985 lines
50 KiB
1985 lines
50 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
|
* GENEVE: Generic Network Virtualization Encapsulation |
|
* |
|
* Copyright (c) 2015 Red Hat, Inc. |
|
*/ |
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
|
|
|
#include <linux/ethtool.h> |
|
#include <linux/kernel.h> |
|
#include <linux/module.h> |
|
#include <linux/etherdevice.h> |
|
#include <linux/hash.h> |
|
#include <net/ipv6_stubs.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_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; |
|
}; |
|
|
|
struct geneve_config { |
|
struct ip_tunnel_info info; |
|
bool collect_md; |
|
bool use_udp6_rx_checksums; |
|
bool ttl_inherit; |
|
enum ifla_geneve_df df; |
|
}; |
|
|
|
/* 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 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; |
|
struct geneve_config cfg; |
|
}; |
|
|
|
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->cfg.info.key.tun_id, vni) && |
|
addr == node->geneve->cfg.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->cfg.info.key.tun_id, vni) && |
|
ipv6_addr_equal(&addr6, &node->geneve->cfg.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; |
|
unsigned int len; |
|
int err = 0; |
|
void *oiph; |
|
|
|
if (ip_tunnel_collect_metadata() || gs->collect_md) { |
|
__be16 flags; |
|
|
|
flags = TUNNEL_KEY | (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, |
|
TUNNEL_GENEVE_OPT); |
|
} 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)) |
|
dev_sw_netstats_rx_add(geneve->dev, len); |
|
|
|
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->cfg.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->cfg.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; |
|
} |
|
|
|
/* Callback from net/ipv{4,6}/udp.c to check that we have a tunnel for errors */ |
|
static int geneve_udp_encap_err_lookup(struct sock *sk, struct sk_buff *skb) |
|
{ |
|
struct genevehdr *geneveh; |
|
struct geneve_sock *gs; |
|
u8 zero_vni[3] = { 0 }; |
|
u8 *vni = zero_vni; |
|
|
|
if (!pskb_may_pull(skb, skb_transport_offset(skb) + GENEVE_BASE_HLEN)) |
|
return -EINVAL; |
|
|
|
geneveh = geneve_hdr(skb); |
|
if (geneveh->ver != GENEVE_VER) |
|
return -EINVAL; |
|
|
|
if (geneveh->proto_type != htons(ETH_P_TEB)) |
|
return -EINVAL; |
|
|
|
gs = rcu_dereference_sk_user_data(sk); |
|
if (!gs) |
|
return -ENOENT; |
|
|
|
if (geneve_get_sk_family(gs) == AF_INET) { |
|
struct iphdr *iph = ip_hdr(skb); |
|
__be32 addr4 = 0; |
|
|
|
if (!gs->collect_md) { |
|
vni = geneve_hdr(skb)->vni; |
|
addr4 = iph->daddr; |
|
} |
|
|
|
return geneve_lookup(gs, addr4, vni) ? 0 : -ENOENT; |
|
} |
|
|
|
#if IS_ENABLED(CONFIG_IPV6) |
|
if (geneve_get_sk_family(gs) == AF_INET6) { |
|
struct ipv6hdr *ip6h = ipv6_hdr(skb); |
|
struct in6_addr addr6; |
|
|
|
memset(&addr6, 0, sizeof(struct in6_addr)); |
|
|
|
if (!gs->collect_md) { |
|
vni = geneve_hdr(skb)->vni; |
|
addr6 = ip6h->daddr; |
|
} |
|
|
|
return geneve6_lookup(gs, addr6, vni) ? 0 : -ENOENT; |
|
} |
|
#endif |
|
|
|
return -EPFNOSUPPORT; |
|
} |
|
|
|
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); |
|
|
|
udp_allow_gso(sock->sk); |
|
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 list_head *head, |
|
struct sk_buff *skb) |
|
{ |
|
struct sk_buff *pp = NULL; |
|
struct sk_buff *p; |
|
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; |
|
} |
|
|
|
list_for_each_entry(p, head, list) { |
|
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: |
|
skb_gro_flush_final(skb, pp, 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_err_lookup = geneve_udp_encap_err_lookup; |
|
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->cfg.info.key.tp_dst); |
|
if (gs) { |
|
gs->refcnt++; |
|
goto out; |
|
} |
|
|
|
gs = geneve_socket_create(net, geneve->cfg.info.key.tp_dst, ipv6, |
|
geneve->cfg.use_udp6_rx_checksums); |
|
if (IS_ERR(gs)) |
|
return PTR_ERR(gs); |
|
|
|
out: |
|
gs->collect_md = geneve->cfg.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->cfg.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 metadata = geneve->cfg.collect_md; |
|
bool ipv4, ipv6; |
|
int ret = 0; |
|
|
|
ipv6 = geneve->cfg.info.mode & IP_TUNNEL_INFO_IPV6 || metadata; |
|
ipv4 = !ipv6 || metadata; |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
if (ipv6) { |
|
ret = geneve_sock_add(geneve, true); |
|
if (ret < 0 && ret != -EAFNOSUPPORT) |
|
ipv4 = false; |
|
} |
|
#endif |
|
if (ipv4) |
|
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; |
|
|
|
if (info->key.tun_flags & TUNNEL_GENEVE_OPT) |
|
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, |
|
__be16 dport, __be16 sport) |
|
{ |
|
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; |
|
fl4->fl4_dport = dport; |
|
fl4->fl4_sport = sport; |
|
|
|
tos = info->key.tos; |
|
if ((tos == 1) && !geneve->cfg.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, |
|
__be16 dport, __be16 sport) |
|
{ |
|
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; |
|
fl6->fl6_dport = dport; |
|
fl6->fl6_sport = sport; |
|
|
|
prio = info->key.tos; |
|
if ((prio == 1) && !geneve->cfg.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; |
|
} |
|
dst = ipv6_stub->ipv6_dst_lookup_flow(geneve->net, gs6->sock->sk, fl6, |
|
NULL); |
|
if (IS_ERR(dst)) { |
|
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 df = 0; |
|
__be16 sport; |
|
int err; |
|
|
|
if (!pskb_inet_may_pull(skb)) |
|
return -EINVAL; |
|
|
|
sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); |
|
rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info, |
|
geneve->cfg.info.key.tp_dst, sport); |
|
if (IS_ERR(rt)) |
|
return PTR_ERR(rt); |
|
|
|
err = skb_tunnel_check_pmtu(skb, &rt->dst, |
|
GENEVE_IPV4_HLEN + info->options_len, |
|
netif_is_any_bridge_port(dev)); |
|
if (err < 0) { |
|
dst_release(&rt->dst); |
|
return err; |
|
} else if (err) { |
|
struct ip_tunnel_info *info; |
|
|
|
info = skb_tunnel_info(skb); |
|
if (info) { |
|
struct ip_tunnel_info *unclone; |
|
|
|
unclone = skb_tunnel_info_unclone(skb); |
|
if (unlikely(!unclone)) { |
|
dst_release(&rt->dst); |
|
return -ENOMEM; |
|
} |
|
|
|
unclone->key.u.ipv4.dst = fl4.saddr; |
|
unclone->key.u.ipv4.src = fl4.daddr; |
|
} |
|
|
|
if (!pskb_may_pull(skb, ETH_HLEN)) { |
|
dst_release(&rt->dst); |
|
return -EINVAL; |
|
} |
|
|
|
skb->protocol = eth_type_trans(skb, geneve->dev); |
|
netif_rx(skb); |
|
dst_release(&rt->dst); |
|
return -EMSGSIZE; |
|
} |
|
|
|
if (geneve->cfg.collect_md) { |
|
tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); |
|
ttl = key->ttl; |
|
|
|
df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; |
|
} else { |
|
tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, ip_hdr(skb), skb); |
|
if (geneve->cfg.ttl_inherit) |
|
ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb); |
|
else |
|
ttl = key->ttl; |
|
ttl = ttl ? : ip4_dst_hoplimit(&rt->dst); |
|
|
|
if (geneve->cfg.df == GENEVE_DF_SET) { |
|
df = htons(IP_DF); |
|
} else if (geneve->cfg.df == GENEVE_DF_INHERIT) { |
|
struct ethhdr *eth = eth_hdr(skb); |
|
|
|
if (ntohs(eth->h_proto) == ETH_P_IPV6) { |
|
df = htons(IP_DF); |
|
} else if (ntohs(eth->h_proto) == ETH_P_IP) { |
|
struct iphdr *iph = ip_hdr(skb); |
|
|
|
if (iph->frag_off & htons(IP_DF)) |
|
df = htons(IP_DF); |
|
} |
|
} |
|
} |
|
|
|
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->cfg.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; |
|
|
|
if (!pskb_inet_may_pull(skb)) |
|
return -EINVAL; |
|
|
|
sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); |
|
dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info, |
|
geneve->cfg.info.key.tp_dst, sport); |
|
if (IS_ERR(dst)) |
|
return PTR_ERR(dst); |
|
|
|
err = skb_tunnel_check_pmtu(skb, dst, |
|
GENEVE_IPV6_HLEN + info->options_len, |
|
netif_is_any_bridge_port(dev)); |
|
if (err < 0) { |
|
dst_release(dst); |
|
return err; |
|
} else if (err) { |
|
struct ip_tunnel_info *info = skb_tunnel_info(skb); |
|
|
|
if (info) { |
|
struct ip_tunnel_info *unclone; |
|
|
|
unclone = skb_tunnel_info_unclone(skb); |
|
if (unlikely(!unclone)) { |
|
dst_release(dst); |
|
return -ENOMEM; |
|
} |
|
|
|
unclone->key.u.ipv6.dst = fl6.saddr; |
|
unclone->key.u.ipv6.src = fl6.daddr; |
|
} |
|
|
|
if (!pskb_may_pull(skb, ETH_HLEN)) { |
|
dst_release(dst); |
|
return -EINVAL; |
|
} |
|
|
|
skb->protocol = eth_type_trans(skb, geneve->dev); |
|
netif_rx(skb); |
|
dst_release(dst); |
|
return -EMSGSIZE; |
|
} |
|
|
|
if (geneve->cfg.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); |
|
if (geneve->cfg.ttl_inherit) |
|
ttl = ip_tunnel_get_ttl(ip_hdr(skb), skb); |
|
else |
|
ttl = key->ttl; |
|
ttl = 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->cfg.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->cfg.collect_md) { |
|
info = skb_tunnel_info(skb); |
|
if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) { |
|
netdev_dbg(dev, "no tunnel metadata\n"); |
|
dev_kfree_skb(skb); |
|
dev->stats.tx_dropped++; |
|
return NETDEV_TX_OK; |
|
} |
|
} else { |
|
info = &geneve->cfg.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; |
|
|
|
if (err != -EMSGSIZE) |
|
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); |
|
__be16 sport; |
|
|
|
if (ip_tunnel_info_af(info) == AF_INET) { |
|
struct rtable *rt; |
|
struct flowi4 fl4; |
|
|
|
struct geneve_sock *gs4 = rcu_dereference(geneve->sock4); |
|
sport = udp_flow_src_port(geneve->net, skb, |
|
1, USHRT_MAX, true); |
|
|
|
rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info, |
|
geneve->cfg.info.key.tp_dst, sport); |
|
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); |
|
sport = udp_flow_src_port(geneve->net, skb, |
|
1, USHRT_MAX, true); |
|
|
|
dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info, |
|
geneve->cfg.info.key.tp_dst, sport); |
|
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 = sport; |
|
info->key.tp_dst = geneve->cfg.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 = dev_get_tstats64, |
|
.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 | NETIF_F_FRAGLIST; |
|
dev->features |= NETIF_F_RXCSUM; |
|
dev->features |= NETIF_F_GSO_SOFTWARE; |
|
|
|
dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST; |
|
dev->hw_features |= 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 = sizeof_field(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 }, |
|
[IFLA_GENEVE_TTL_INHERIT] = { .type = NLA_U8 }, |
|
[IFLA_GENEVE_DF] = { .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; |
|
} |
|
} |
|
|
|
if (data[IFLA_GENEVE_DF]) { |
|
enum ifla_geneve_df df = nla_get_u8(data[IFLA_GENEVE_DF]); |
|
|
|
if (df < 0 || df > GENEVE_DF_MAX) { |
|
NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_DF], |
|
"Invalid DF attribute"); |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
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->cfg.info.key.tp_dst) { |
|
*tun_collect_md = geneve->cfg.collect_md; |
|
*tun_on_same_port = true; |
|
} |
|
if (info->key.tun_id == geneve->cfg.info.key.tun_id && |
|
info->key.tp_dst == geneve->cfg.info.key.tp_dst && |
|
!memcmp(&info->key.u, &geneve->cfg.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 geneve_config *cfg) |
|
{ |
|
struct geneve_net *gn = net_generic(net, geneve_net_id); |
|
struct geneve_dev *t, *geneve = netdev_priv(dev); |
|
const struct ip_tunnel_info *info = &cfg->info; |
|
bool tun_collect_md, tun_on_same_port; |
|
int err, encap_len; |
|
|
|
if (cfg->collect_md && !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 (!cfg->collect_md && 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 (cfg->collect_md) { |
|
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->cfg.info.dst_cache); |
|
memcpy(&geneve->cfg, cfg, sizeof(*cfg)); |
|
|
|
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 geneve_config *cfg, bool changelink) |
|
{ |
|
struct ip_tunnel_info *info = &cfg->info; |
|
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 (ipv4_is_multicast(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; |
|
cfg->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_INHERIT]) { |
|
if (nla_get_u8(data[IFLA_GENEVE_TTL_INHERIT])) |
|
cfg->ttl_inherit = true; |
|
else |
|
cfg->ttl_inherit = false; |
|
} else if (data[IFLA_GENEVE_TTL]) { |
|
info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]); |
|
cfg->ttl_inherit = false; |
|
} |
|
|
|
if (data[IFLA_GENEVE_TOS]) |
|
info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]); |
|
|
|
if (data[IFLA_GENEVE_DF]) |
|
cfg->df = nla_get_u8(data[IFLA_GENEVE_DF]); |
|
|
|
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; |
|
} |
|
cfg->collect_md = 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])) |
|
cfg->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; |
|
|
|
if (!__in6_dev_get(dev)) |
|
break; |
|
|
|
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) |
|
{ |
|
struct geneve_config cfg = { |
|
.df = GENEVE_DF_UNSET, |
|
.use_udp6_rx_checksums = false, |
|
.ttl_inherit = false, |
|
.collect_md = false, |
|
}; |
|
int err; |
|
|
|
init_tnl_info(&cfg.info, GENEVE_UDP_PORT); |
|
err = geneve_nl2info(tb, data, extack, &cfg, false); |
|
if (err) |
|
return err; |
|
|
|
err = geneve_configure(net, dev, extack, &cfg); |
|
if (err) |
|
return err; |
|
|
|
geneve_link_config(dev, &cfg.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 geneve_config cfg; |
|
int err; |
|
|
|
/* If the geneve device is configured for metadata (or externally |
|
* controlled, for example, OVS), then nothing can be changed. |
|
*/ |
|
if (geneve->cfg.collect_md) |
|
return -EOPNOTSUPP; |
|
|
|
/* Start with the existing info. */ |
|
memcpy(&cfg, &geneve->cfg, sizeof(cfg)); |
|
err = geneve_nl2info(tb, data, extack, &cfg, true); |
|
if (err) |
|
return err; |
|
|
|
if (!geneve_dst_addr_equal(&geneve->cfg.info, &cfg.info)) { |
|
dst_cache_reset(&cfg.info.dst_cache); |
|
geneve_link_config(dev, &cfg.info, tb); |
|
} |
|
|
|
geneve_quiesce(geneve, &gs4, &gs6); |
|
memcpy(&geneve->cfg, &cfg, sizeof(cfg)); |
|
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(__u8)) + /* IFLA_GENEVE_DF */ |
|
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 */ |
|
nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL_INHERIT */ |
|
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->cfg.info; |
|
bool ttl_inherit = geneve->cfg.ttl_inherit; |
|
bool metadata = geneve->cfg.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_u8(skb, IFLA_GENEVE_DF, geneve->cfg.df)) |
|
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->cfg.use_udp6_rx_checksums)) |
|
goto nla_put_failure; |
|
#endif |
|
|
|
if (nla_put_u8(skb, IFLA_GENEVE_TTL_INHERIT, ttl_inherit)) |
|
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, |
|
.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 net_device *dev; |
|
LIST_HEAD(list_kill); |
|
int err; |
|
struct geneve_config cfg = { |
|
.df = GENEVE_DF_UNSET, |
|
.use_udp6_rx_checksums = true, |
|
.ttl_inherit = false, |
|
.collect_md = true, |
|
}; |
|
|
|
memset(tb, 0, sizeof(tb)); |
|
dev = rtnl_create_link(net, name, name_assign_type, |
|
&geneve_link_ops, tb, NULL); |
|
if (IS_ERR(dev)) |
|
return dev; |
|
|
|
init_tnl_info(&cfg.info, dst_port); |
|
err = geneve_configure(net, dev, NULL, &cfg); |
|
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) |
|
geneve_offload_rx_ports(dev, true); |
|
else if (event == NETDEV_UDP_TUNNEL_DROP_INFO) |
|
geneve_offload_rx_ports(dev, false); |
|
|
|
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); |
|
} |
|
} |
|
|
|
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(); |
|
|
|
list_for_each_entry(net, net_list, exit_list) { |
|
const struct geneve_net *gn = net_generic(net, geneve_net_id); |
|
|
|
WARN_ON_ONCE(!list_empty(&gn->sock_list)); |
|
} |
|
} |
|
|
|
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 <[email protected]>"); |
|
MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic"); |
|
MODULE_ALIAS_RTNL_LINK("geneve");
|
|
|