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geneve.c
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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/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/hash.h>
#include <linux/if_link.h>
#include <linux/if_vlan.h>
#include <net/addrconf.h>
#include <net/dst_cache.h>
#include <net/dst_metadata.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
#include <net/rtnetlink.h>
#include <net/geneve.h>
#include <net/protocol.h>
#include <net/udp_tunnel.h>
#include <net/ip6_route.h>
#if IS_ENABLED(CONFIG_IPV6)
#include <net/ipv6.h>
#include <net/addrconf.h>
#include <net/ip6_tunnel.h>
#include <net/ip6_checksum.h>
#endif
#include "gso.h"
#include "vport-netdev.h"
#include "compat.h"
#ifndef USE_UPSTREAM_TUNNEL
#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)
#define GENEVE_VER 0
#define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr))
/* per-network namespace private data for this module */
struct geneve_net {
struct list_head geneve_list;
struct list_head sock_list;
};
static int geneve_net_id;
union geneve_addr {
struct sockaddr_in sin;
struct sockaddr_in6 sin6;
struct sockaddr sa;
};
static union geneve_addr geneve_remote_unspec = { .sa.sa_family = AF_UNSPEC, };
/* Pseudo network device */
struct geneve_dev {
struct hlist_node hlist; /* vni hash table */
struct net *net; /* netns for packet i/o */
struct net_device *dev; /* netdev for geneve tunnel */
struct geneve_sock __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
u8 vni[3]; /* virtual network ID for tunnel */
u8 ttl; /* TTL override */
u8 tos; /* TOS override */
union geneve_addr remote; /* IP address for link partner */
struct list_head next; /* geneve's per namespace list */
__be32 label; /* IPv6 flowlabel override */
__be16 dst_port;
bool collect_md;
u32 flags;
struct dst_cache dst_cache;
};
/* Geneve device flags */
#define GENEVE_F_UDP_ZERO_CSUM_TX BIT(0)
#define GENEVE_F_UDP_ZERO_CSUM6_TX BIT(1)
#define GENEVE_F_UDP_ZERO_CSUM6_RX BIT(2)
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];
u32 flags;
#ifdef HAVE_UDP_OFFLOAD
struct udp_offload udp_offloads;
#endif
};
static inline __u32 geneve_net_vni_hash(u8 vni[3])
{
__u32 vnid;
vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2];
return hash_32(vnid, VNI_HASH_BITS);
}
static __be64 vni_to_tunnel_id(const __u8 *vni)
{
#ifdef __BIG_ENDIAN
return (vni[0] << 16) | (vni[1] << 8) | vni[2];
#else
return (__force __be64)(((__force u64)vni[0] << 40) |
((__force u64)vni[1] << 48) |
((__force u64)vni[2] << 56));
#endif
}
static 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 *geneve;
__u32 hash;
/* Find the device for this VNI */
hash = geneve_net_vni_hash(vni);
vni_list_head = &gs->vni_list[hash];
hlist_for_each_entry_rcu(geneve, vni_list_head, hlist) {
if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) &&
addr == geneve->remote.sin.sin_addr.s_addr)
return geneve;
}
return NULL;
}
#if IS_ENABLED(CONFIG_IPV6)
static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs,
struct in6_addr addr6, u8 vni[])
{
struct hlist_head *vni_list_head;
struct geneve_dev *geneve;
__u32 hash;
/* Find the device for this VNI */
hash = geneve_net_vni_hash(vni);
vni_list_head = &gs->vni_list[hash];
hlist_for_each_entry_rcu(geneve, vni_list_head, hlist) {
if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) &&
ipv6_addr_equal(&addr6, &geneve->remote.sin6.sin6_addr))
return geneve;
}
return NULL;
}
#endif
static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
{
return (struct genevehdr *)(udp_hdr(skb) + 1);
}
static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs,
struct sk_buff *skb)
{
u8 *vni;
__be32 addr;
static u8 zero_vni[3];
#if IS_ENABLED(CONFIG_IPV6)
static struct in6_addr zero_addr6;
#endif
if (geneve_get_sk_family(gs) == AF_INET) {
struct iphdr *iph;
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) {
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;
int err = 0;
void *oiph;
union {
struct metadata_dst dst;
char buf[sizeof(struct metadata_dst) + 256];
} buf;
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 = &buf.dst;
ovs_udp_tun_rx_dst(tun_dst,
skb, geneve_get_sk_family(gs), flags,
vni_to_tunnel_id(gnvh->vni),
gnvh->opt_len * 4);
if (!tun_dst)
goto drop;
/* Update tunnel dst according to Geneve options. */
ip_tunnel_info_opts_set(&tun_dst->u.tun_info,
gnvh->options, gnvh->opt_len * 4,
TUNNEL_GENEVE_OPT);
} else {
/* Drop packets w/ critical options,
* since we don't support any...
*/
if (gnvh->critical)
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)
ovs_skb_dst_set(skb, &tun_dst->dst);
/* Ignore packet loops (and multicast echo) */
if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr))
goto drop;
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 > 1)) {
++geneve->dev->stats.rx_frame_errors;
++geneve->dev->stats.rx_errors;
goto drop;
}
stats = this_cpu_ptr(geneve->dev->tstats);
u64_stats_update_begin(&stats->syncp);
stats->rx_packets++;
stats->rx_bytes += skb->len;
u64_stats_update_end(&stats->syncp);
netdev_port_receive(skb, skb_tunnel_info(skb));
return;
drop:
/* Consume bad packet */
kfree_skb(skb);
}
/* Setup stats when device is created */
static int geneve_init(struct net_device *dev)
{
struct geneve_dev *geneve = netdev_priv(dev);
int err;
dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
if (!dev->tstats)
return -ENOMEM;
err = dst_cache_init(&geneve->dst_cache, GFP_KERNEL);
if (err) {
free_percpu(dev->tstats);
return err;
}
return 0;
}
static void geneve_uninit(struct net_device *dev)
{
struct geneve_dev *geneve = netdev_priv(dev);
dst_cache_destroy(&geneve->dst_cache);
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 Geneve and inner Ethernet 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;
#if IS_ENABLED(CONFIG_IPV6)
#ifdef OVS_CHECK_UDP_TUNNEL_ZERO_CSUM
if (geneve_get_sk_family(gs) == AF_INET6 &&
!udp_hdr(skb)->check &&
!(gs->flags & GENEVE_F_UDP_ZERO_CSUM6_RX)) {
udp6_csum_zero_error(skb);
goto drop;
}
#endif
#endif
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))))
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, u32 flags)
{
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 =
!(flags & GENEVE_F_UDP_ZERO_CSUM6_RX);
} else {
udp_conf.family = AF_INET;
udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
}
udp_conf.local_udp_port = port;
/* Open UDP socket */
err = udp_sock_create(net, &udp_conf, &sock);
if (err < 0)
return ERR_PTR(err);
return sock;
}
static void geneve_notify_add_rx_port(struct geneve_sock *gs)
{
struct net_device *dev;
struct sock *sk = gs->sock->sk;
struct net *net = sock_net(sk);
sa_family_t sa_family = geneve_get_sk_family(gs);
int err;
if (sa_family == AF_INET) {
err = udp_add_offload(sock_net(sk), &gs->udp_offloads);
if (err)
pr_warn("geneve: udp_add_offload failed with status %d\n",
err);
}
rcu_read_lock();
for_each_netdev_rcu(net, dev) {
#ifdef HAVE_NDO_ADD_GENEVE_PORT
__be16 port = inet_sk(sk)->inet_sport;
if (dev->netdev_ops->ndo_add_geneve_port)
dev->netdev_ops->ndo_add_geneve_port(dev, sa_family,
port);
#elif defined(HAVE_NDO_UDP_TUNNEL_ADD)
struct udp_tunnel_info ti;
ti.type = UDP_TUNNEL_TYPE_GENEVE;
ti.sa_family = sa_family;
ti.port = inet_sk(sk)->inet_sport;
if (dev->netdev_ops->ndo_udp_tunnel_add)
dev->netdev_ops->ndo_udp_tunnel_add(dev, &ti);
#endif
}
rcu_read_unlock();
}
static void geneve_notify_del_rx_port(struct geneve_sock *gs)
{
struct net_device *dev;
struct sock *sk = gs->sock->sk;
struct net *net = sock_net(sk);
sa_family_t sa_family = geneve_get_sk_family(gs);
rcu_read_lock();
for_each_netdev_rcu(net, dev) {
#ifdef HAVE_NDO_ADD_GENEVE_PORT
__be16 port = inet_sk(sk)->inet_sport;
if (dev->netdev_ops->ndo_del_geneve_port)
dev->netdev_ops->ndo_del_geneve_port(dev, sa_family,
port);
#elif defined(HAVE_NDO_UDP_TUNNEL_ADD)
struct udp_tunnel_info ti;
ti.type = UDP_TUNNEL_TYPE_GENEVE;
ti.port = inet_sk(sk)->inet_sport;
ti.sa_family = sa_family;
if (dev->netdev_ops->ndo_udp_tunnel_del)
dev->netdev_ops->ndo_udp_tunnel_del(dev, &ti);
#endif
}
rcu_read_unlock();
if (sa_family == AF_INET)
udp_del_offload(&gs->udp_offloads);
}
#if defined(HAVE_UDP_OFFLOAD) || \
defined(HAVE_UDP_TUNNEL_SOCK_CFG_GRO_RECEIVE)
static int geneve_hlen(struct genevehdr *gh)
{
return sizeof(*gh) + gh->opt_len * 4;
}
#ifndef HAVE_UDP_OFFLOAD_ARG_UOFF
static struct sk_buff **geneve_gro_receive(struct sk_buff **head,
struct sk_buff *skb)
#else
static struct sk_buff **geneve_gro_receive(struct sk_buff **head,
struct sk_buff *skb,
struct udp_offload *uoff)
#endif
{
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 = ptype->callbacks.gro_receive(head, skb);
flush = 0;
out_unlock:
rcu_read_unlock();
out:
NAPI_GRO_CB(skb)->flush |= flush;
return pp;
}
#ifndef HAVE_UDP_OFFLOAD_ARG_UOFF
static int geneve_gro_complete(struct sk_buff *skb, int nhoff)
#else
static int geneve_gro_complete(struct sk_buff *skb, int nhoff,
struct udp_offload *uoff)
#endif
{
struct genevehdr *gh;
struct packet_offload *ptype;
__be16 type;
int gh_len;
int err = -ENOSYS;
udp_tunnel_gro_complete(skb, nhoff);
gh = (struct genevehdr *)(skb->data + nhoff);
gh_len = geneve_hlen(gh);
type = gh->proto_type;
rcu_read_lock();
ptype = gro_find_complete_by_type(type);
if (ptype)
err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
rcu_read_unlock();
skb_set_inner_mac_header(skb, nhoff + gh_len);
return err;
}
#endif
/* Create new listen socket if needed */
static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
bool ipv6, u32 flags)
{
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, flags);
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 */
#ifdef HAVE_UDP_OFFLOAD
gs->udp_offloads.port = port;
gs->udp_offloads.callbacks.gro_receive = geneve_gro_receive;
gs->udp_offloads.callbacks.gro_complete = geneve_gro_complete;
#endif
geneve_notify_add_rx_port(gs);
/* Mark socket as an encapsulation socket */
memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
tunnel_cfg.sk_user_data = gs;
tunnel_cfg.encap_type = 1;
#ifdef HAVE_UDP_TUNNEL_SOCK_CFG_GRO_RECEIVE
tunnel_cfg.gro_receive = geneve_gro_receive;
tunnel_cfg.gro_complete = geneve_gro_complete;
#endif
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);
geneve_notify_del_rx_port(gs);
udp_tunnel_sock_release(gs->sock);
kfree_rcu(gs, rcu);
}
static void geneve_sock_release(struct geneve_dev *geneve)
{
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_sock *gs;
__u32 hash;
gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->dst_port);
if (gs) {
gs->refcnt++;
goto out;
}
gs = geneve_socket_create(net, geneve->dst_port, ipv6, geneve->flags);
if (IS_ERR(gs))
return PTR_ERR(gs);
out:
gs->collect_md = geneve->collect_md;
gs->flags = geneve->flags;
#if IS_ENABLED(CONFIG_IPV6)
if (ipv6)
rcu_assign_pointer(geneve->sock6, gs);
else
#endif
rcu_assign_pointer(geneve->sock4, gs);
hash = geneve_net_vni_hash(geneve->vni);
hlist_add_head_rcu(&geneve->hlist, &gs->vni_list[hash]);
return 0;
}
static int geneve_open(struct net_device *dev)
{
struct geneve_dev *geneve = netdev_priv(dev);
bool ipv6 = geneve->remote.sa.sa_family == AF_INET6;
bool metadata = geneve->collect_md;
int ret = 0;
#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);
if (!hlist_unhashed(&geneve->hlist))
hlist_del_rcu(&geneve->hlist);
geneve_sock_release(geneve);
return 0;
}
static void geneve_build_header(struct genevehdr *geneveh,
__be16 tun_flags, u8 vni[3],
u8 options_len, u8 *options)
{
geneveh->ver = GENEVE_VER;
geneveh->opt_len = options_len / 4;
geneveh->oam = !!(tun_flags & TUNNEL_OAM);
geneveh->critical = !!(tun_flags & TUNNEL_CRIT_OPT);
geneveh->rsvd1 = 0;
memcpy(geneveh->vni, vni, 3);
geneveh->proto_type = htons(ETH_P_TEB);
geneveh->rsvd2 = 0;
memcpy(geneveh->options, options, options_len);
}
static int push_vlan_tag(struct sk_buff *skb)
{
if (skb_vlan_tag_present(skb)) {
__be16 vlan_proto = skb->vlan_proto;
int err;
err = __vlan_insert_tag(skb, skb->vlan_proto,
skb_vlan_tag_get(skb));
if (unlikely(err))
return err;
skb->vlan_tci = 0;
skb->protocol = vlan_proto;
}
return 0;
}
static int geneve_build_skb(struct rtable *rt, struct sk_buff *skb,
__be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt,
u32 flags, bool xnet)
{
struct genevehdr *gnvh;
int min_headroom;
int err;
bool udp_sum = !(flags & GENEVE_F_UDP_ZERO_CSUM_TX);
skb_scrub_packet(skb, xnet);
min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
+ GENEVE_BASE_HLEN + opt_len + sizeof(struct iphdr)
+ (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
err = skb_cow_head(skb, min_headroom);
if (unlikely(err))
goto free_rt;
err = push_vlan_tag(skb);
if (unlikely(err))
goto free_rt;
err = udp_tunnel_handle_offloads(skb, udp_sum);
if (err)
goto free_rt;
gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len);
geneve_build_header(gnvh, tun_flags, vni, opt_len, opt);
ovs_skb_set_inner_protocol(skb, htons(ETH_P_TEB));
return 0;
free_rt:
ip_rt_put(rt);
return err;
}
#if IS_ENABLED(CONFIG_IPV6)
static int geneve6_build_skb(struct dst_entry *dst, struct sk_buff *skb,
__be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt,
u32 flags, bool xnet)
{
struct genevehdr *gnvh;
int min_headroom;
int err;
bool udp_sum = !(flags & GENEVE_F_UDP_ZERO_CSUM6_TX);
skb_scrub_packet(skb, xnet);
min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len
+ GENEVE_BASE_HLEN + opt_len + sizeof(struct ipv6hdr)
+ (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
err = skb_cow_head(skb, min_headroom);
if (unlikely(err))
goto free_dst;
err = push_vlan_tag(skb);
if (unlikely(err))
goto free_dst;
err = udp_tunnel_handle_offloads(skb, udp_sum);
if (err)
goto free_dst;
gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len);
geneve_build_header(gnvh, tun_flags, vni, opt_len, opt);
ovs_skb_set_inner_protocol(skb, htons(ETH_P_TEB));
return 0;
free_dst:
dst_release(dst);
return err;
}
#endif
static struct rtable *geneve_get_v4_rt(struct sk_buff *skb,
struct net_device *dev,
struct flowi4 *fl4,
struct ip_tunnel_info *info,
__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 (!rcu_dereference(geneve->sock4))
return ERR_PTR(-EIO);
memset(fl4, 0, sizeof(*fl4));
fl4->flowi4_mark = skb->mark;
fl4->flowi4_proto = IPPROTO_UDP;
fl4->fl4_dport = dport;
fl4->fl4_sport = sport;
if (info) {
fl4->daddr = info->key.u.ipv4.dst;
fl4->saddr = info->key.u.ipv4.src;
fl4->flowi4_tos = RT_TOS(info->key.tos);
dst_cache = &info->dst_cache;
} else {
tos = geneve->tos;
if (tos == 1) {
const struct iphdr *iip = ip_hdr(skb);
tos = ip_tunnel_get_dsfield(iip, skb);
use_cache = false;
}
fl4->flowi4_tos = RT_TOS(tos);
fl4->daddr = geneve->remote.sin.sin_addr.s_addr;
dst_cache = &geneve->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 flowi6 *fl6,
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;
struct geneve_sock *gs6;
__u8 prio;
gs6 = rcu_dereference(geneve->sock6);
if (!gs6)
return ERR_PTR(-EIO);
memset(fl6, 0, sizeof(*fl6));
fl6->flowi6_mark = skb->mark;
fl6->flowi6_proto = IPPROTO_UDP;
fl6->fl6_dport = dport;
fl6->fl6_sport = sport;
if (info) {
fl6->daddr = info->key.u.ipv6.dst;
fl6->saddr = info->key.u.ipv6.src;
fl6->flowlabel = ip6_make_flowinfo(RT_TOS(info->key.tos),
info->key.label);
dst_cache = &info->dst_cache;
} else {
prio = geneve->tos;
if (prio == 1) {
const struct iphdr *iip = ip_hdr(skb);
prio = ip_tunnel_get_dsfield(iip, skb);
use_cache = false;
}
fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio),
geneve->label);
fl6->daddr = geneve->remote.sin6.sin6_addr;
dst_cache = &geneve->dst_cache;
}
if (use_cache) {
dst = dst_cache_get_ip6(dst_cache, &fl6->saddr);
if (dst)
return dst;
}
#if defined(HAVE_IPV6_STUB_WITH_DST_ENTRY) && defined(HAVE_IPV6_DST_LOOKUP_FLOW)
#ifdef HAVE_IPV6_DST_LOOKUP_FLOW_NET
dst = ipv6_stub->ipv6_dst_lookup_flow(geneve->net, gs6->sock->sk, fl6,
NULL);
#else
dst = ipv6_stub->ipv6_dst_lookup_flow(gs6->sock->sk, fl6,
NULL);
#endif
if (IS_ERR(dst)) {
#elif defined(HAVE_IPV6_DST_LOOKUP_FLOW_NET)
if (ipv6_stub->ipv6_dst_lookup_flow(geneve->net, gs6->sock->sk, &dst,
fl6)) {
#elif defined(HAVE_IPV6_DST_LOOKUP_FLOW)
if (ipv6_stub->ipv6_dst_lookup_flow(gs6->sock->sk, &dst, fl6)) {
#elif defined(HAVE_IPV6_DST_LOOKUP_NET)
if (ipv6_stub->ipv6_dst_lookup(geneve->net, gs6->sock->sk, &dst, fl6)) {
#elif defined(HAVE_IPV6_STUB)
if (ipv6_stub->ipv6_dst_lookup(gs6->sock->sk, &dst, fl6)) {
#else
if (ip6_dst_lookup(gs6->sock->sk, &dst, fl6)) {
#endif
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