#include <net/dst_metadata.h>
#include <net/rtnetlink.h>
#include <net/geneve.h>
+#include <net/protocol.h>
#define GENEVE_NETDEV_VER "0.6"
module_param(log_ecn_error, bool, 0644);
MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
+#define GENEVE_VER 0
+#define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr))
+
/* per-network namespace private data for this module */
struct geneve_net {
- struct list_head geneve_list;
- struct hlist_head vni_list[VNI_HASH_SIZE];
- struct geneve_dev __rcu *collect_md_tun;
+ struct list_head geneve_list;
+ struct hlist_head vni_list[VNI_HASH_SIZE];
+ struct list_head sock_list;
};
+static int geneve_net_id;
+
/* Pseudo network device */
struct geneve_dev {
struct hlist_node hlist; /* vni hash table */
bool collect_md;
};
-static int geneve_net_id;
+struct geneve_sock {
+ bool collect_md;
+ struct geneve_net *gn;
+ struct list_head list;
+ struct socket *sock;
+ struct rcu_head rcu;
+ int refcnt;
+ struct udp_offload udp_offloads;
+};
static inline __u32 geneve_net_vni_hash(u8 vni[3])
{
#endif
}
-static struct geneve_dev *geneve_lookup(struct geneve_net *gn,
- struct geneve_sock *gs,
- struct iphdr *iph,
- struct genevehdr *gnvh)
+static struct geneve_dev *geneve_lookup(struct geneve_net *gn, __be16 port,
+ __be32 addr, u8 vni[])
{
- struct inet_sock *sk = inet_sk(gs->sock->sk);
struct hlist_head *vni_list_head;
struct geneve_dev *geneve;
__u32 hash;
- geneve = rcu_dereference(gn->collect_md_tun);
- if (geneve)
- return geneve;
-
/* Find the device for this VNI */
- hash = geneve_net_vni_hash(gnvh->vni);
+ hash = geneve_net_vni_hash(vni);
vni_list_head = &gn->vni_list[hash];
hlist_for_each_entry_rcu(geneve, vni_list_head, hlist) {
- if (!memcmp(gnvh->vni, geneve->vni, sizeof(geneve->vni)) &&
- iph->saddr == geneve->remote.sin_addr.s_addr &&
- sk->inet_sport == geneve->dst_port) {
+ if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) &&
+ addr == geneve->remote.sin_addr.s_addr &&
+ port == geneve->dst_port) {
return geneve;
}
}
return NULL;
}
+static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb)
+{
+ return (struct genevehdr *)(udp_hdr(skb) + 1);
+}
+
/* geneve receive/decap routine */
static void geneve_rx(struct geneve_sock *gs, struct sk_buff *skb)
{
+ struct inet_sock *sk = inet_sk(gs->sock->sk);
struct genevehdr *gnvh = geneve_hdr(skb);
+ struct geneve_net *gn = gs->gn;
struct metadata_dst *tun_dst = NULL;
struct geneve_dev *geneve = NULL;
struct pcpu_sw_netstats *stats;
- struct geneve_net *gn;
struct iphdr *iph;
+ u8 *vni;
+ __be32 addr;
int err;
iph = ip_hdr(skb); /* Still outer IP header... */
- gn = gs->rcv_data;
- geneve = geneve_lookup(gn, gs, iph, gnvh);
+
+ if (gs->collect_md) {
+ static u8 zero_vni[3];
+
+ vni = zero_vni;
+ addr = 0;
+ } else {
+ vni = gnvh->vni;
+ addr = iph->saddr;
+ }
+
+ geneve = geneve_lookup(gn, sk->inet_sport, addr, vni);
if (!geneve)
goto drop;
- if (ip_tunnel_collect_metadata() || geneve->collect_md) {
+ if (ip_tunnel_collect_metadata() || gs->collect_md) {
__be16 flags;
void *opts;
free_percpu(dev->tstats);
}
+/* Callback from net/ipv4/udp.c to receive packets */
+static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
+{
+ struct genevehdr *geneveh;
+ struct geneve_sock *gs;
+ int opts_len;
+
+ /* Need Geneve and inner Ethernet header to be present */
+ if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
+ goto error;
+
+ /* Return packets with reserved bits set */
+ geneveh = geneve_hdr(skb);
+ if (unlikely(geneveh->ver != GENEVE_VER))
+ goto error;
+
+ if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
+ goto error;
+
+ opts_len = geneveh->opt_len * 4;
+ if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
+ htons(ETH_P_TEB)))
+ goto drop;
+
+ gs = rcu_dereference_sk_user_data(sk);
+ if (!gs)
+ goto drop;
+
+ geneve_rx(gs, skb);
+ return 0;
+
+drop:
+ /* Consume bad packet */
+ kfree_skb(skb);
+ return 0;
+
+error:
+ /* Let the UDP layer deal with the skb */
+ return 1;
+}
+
+static struct socket *geneve_create_sock(struct net *net, bool ipv6,
+ __be16 port)
+{
+ struct socket *sock;
+ struct udp_port_cfg udp_conf;
+ int err;
+
+ memset(&udp_conf, 0, sizeof(udp_conf));
+
+ if (ipv6) {
+ udp_conf.family = AF_INET6;
+ } else {
+ udp_conf.family = AF_INET;
+ udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
+ }
+
+ udp_conf.local_udp_port = port;
+
+ /* Open UDP socket */
+ err = udp_sock_create(net, &udp_conf, &sock);
+ if (err < 0)
+ return ERR_PTR(err);
+
+ return sock;
+}
+
+static void geneve_notify_add_rx_port(struct geneve_sock *gs)
+{
+ struct sock *sk = gs->sock->sk;
+ sa_family_t sa_family = sk->sk_family;
+ int err;
+
+ if (sa_family == AF_INET) {
+ err = udp_add_offload(&gs->udp_offloads);
+ if (err)
+ pr_warn("geneve: udp_add_offload failed with status %d\n",
+ err);
+ }
+}
+
+static int geneve_hlen(struct genevehdr *gh)
+{
+ return sizeof(*gh) + gh->opt_len * 4;
+}
+
+static struct sk_buff **geneve_gro_receive(struct sk_buff **head,
+ struct sk_buff *skb,
+ struct udp_offload *uoff)
+{
+ struct sk_buff *p, **pp = NULL;
+ struct genevehdr *gh, *gh2;
+ unsigned int hlen, gh_len, off_gnv;
+ const struct packet_offload *ptype;
+ __be16 type;
+ int flush = 1;
+
+ off_gnv = skb_gro_offset(skb);
+ hlen = off_gnv + sizeof(*gh);
+ gh = skb_gro_header_fast(skb, off_gnv);
+ if (skb_gro_header_hard(skb, hlen)) {
+ gh = skb_gro_header_slow(skb, hlen, off_gnv);
+ if (unlikely(!gh))
+ goto out;
+ }
+
+ if (gh->ver != GENEVE_VER || gh->oam)
+ goto out;
+ gh_len = geneve_hlen(gh);
+
+ hlen = off_gnv + gh_len;
+ if (skb_gro_header_hard(skb, hlen)) {
+ gh = skb_gro_header_slow(skb, hlen, off_gnv);
+ if (unlikely(!gh))
+ goto out;
+ }
+
+ flush = 0;
+
+ for (p = *head; p; p = p->next) {
+ if (!NAPI_GRO_CB(p)->same_flow)
+ continue;
+
+ gh2 = (struct genevehdr *)(p->data + off_gnv);
+ if (gh->opt_len != gh2->opt_len ||
+ memcmp(gh, gh2, gh_len)) {
+ NAPI_GRO_CB(p)->same_flow = 0;
+ continue;
+ }
+ }
+
+ type = gh->proto_type;
+
+ rcu_read_lock();
+ ptype = gro_find_receive_by_type(type);
+ if (!ptype) {
+ flush = 1;
+ goto out_unlock;
+ }
+
+ skb_gro_pull(skb, gh_len);
+ skb_gro_postpull_rcsum(skb, gh, gh_len);
+ pp = ptype->callbacks.gro_receive(head, skb);
+
+out_unlock:
+ rcu_read_unlock();
+out:
+ NAPI_GRO_CB(skb)->flush |= flush;
+
+ return pp;
+}
+
+static int geneve_gro_complete(struct sk_buff *skb, int nhoff,
+ struct udp_offload *uoff)
+{
+ struct genevehdr *gh;
+ struct packet_offload *ptype;
+ __be16 type;
+ int gh_len;
+ int err = -ENOSYS;
+
+ udp_tunnel_gro_complete(skb, nhoff);
+
+ gh = (struct genevehdr *)(skb->data + nhoff);
+ gh_len = geneve_hlen(gh);
+ type = gh->proto_type;
+
+ rcu_read_lock();
+ ptype = gro_find_complete_by_type(type);
+ if (ptype)
+ err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
+
+ rcu_read_unlock();
+ return err;
+}
+
+/* Create new listen socket if needed */
+static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
+ bool ipv6)
+{
+ struct geneve_net *gn = net_generic(net, geneve_net_id);
+ struct geneve_sock *gs;
+ struct socket *sock;
+ struct udp_tunnel_sock_cfg tunnel_cfg;
+
+ gs = kzalloc(sizeof(*gs), GFP_KERNEL);
+ if (!gs)
+ return ERR_PTR(-ENOMEM);
+
+ sock = geneve_create_sock(net, ipv6, port);
+ if (IS_ERR(sock)) {
+ kfree(gs);
+ return ERR_CAST(sock);
+ }
+
+ gs->sock = sock;
+ gs->refcnt = 1;
+ gs->gn = gn;
+
+ /* Initialize the geneve udp offloads structure */
+ gs->udp_offloads.port = port;
+ gs->udp_offloads.callbacks.gro_receive = geneve_gro_receive;
+ gs->udp_offloads.callbacks.gro_complete = geneve_gro_complete;
+ geneve_notify_add_rx_port(gs);
+
+ /* Mark socket as an encapsulation socket */
+ tunnel_cfg.sk_user_data = gs;
+ tunnel_cfg.encap_type = 1;
+ tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
+ tunnel_cfg.encap_destroy = NULL;
+ setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
+
+ list_add(&gs->list, &gn->sock_list);
+ return gs;
+}
+
+static void geneve_notify_del_rx_port(struct geneve_sock *gs)
+{
+ struct sock *sk = gs->sock->sk;
+ sa_family_t sa_family = sk->sk_family;
+
+ if (sa_family == AF_INET)
+ udp_del_offload(&gs->udp_offloads);
+}
+
+static void geneve_sock_release(struct geneve_sock *gs)
+{
+ if (--gs->refcnt)
+ return;
+
+ list_del(&gs->list);
+ geneve_notify_del_rx_port(gs);
+ udp_tunnel_sock_release(gs->sock);
+ kfree_rcu(gs, rcu);
+}
+
+static struct geneve_sock *geneve_find_sock(struct geneve_net *gn,
+ __be16 dst_port)
+{
+ struct geneve_sock *gs;
+
+ list_for_each_entry(gs, &gn->sock_list, list) {
+ if (inet_sk(gs->sock->sk)->inet_sport == dst_port &&
+ inet_sk(gs->sock->sk)->sk.sk_family == AF_INET) {
+ return gs;
+ }
+ }
+ return NULL;
+}
+
static int geneve_open(struct net_device *dev)
{
struct geneve_dev *geneve = netdev_priv(dev);
struct net *net = geneve->net;
- struct geneve_net *gn = net_generic(geneve->net, geneve_net_id);
+ struct geneve_net *gn = net_generic(net, geneve_net_id);
struct geneve_sock *gs;
- gs = geneve_sock_add(net, geneve->dst_port, geneve_rx, gn,
- false, false);
+ gs = geneve_find_sock(gn, geneve->dst_port);
+ if (gs) {
+ gs->refcnt++;
+ goto out;
+ }
+
+ gs = geneve_socket_create(net, geneve->dst_port, false);
if (IS_ERR(gs))
return PTR_ERR(gs);
+out:
+ gs->collect_md = geneve->collect_md;
geneve->sock = gs;
-
return 0;
}
static int geneve_stop(struct net_device *dev)
{
struct geneve_dev *geneve = netdev_priv(dev);
- struct geneve_sock *gs = geneve->sock;
- geneve_sock_release(gs);
+ geneve_sock_release(geneve->sock);
+ 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,
+ bool csum)
+{
+ struct genevehdr *gnvh;
+ int min_headroom;
+ int err;
+ min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
+ + GENEVE_BASE_HLEN + opt_len + sizeof(struct iphdr);
+ err = skb_cow_head(skb, min_headroom);
+ if (unlikely(err)) {
+ kfree_skb(skb);
+ goto free_rt;
+ }
+
+ skb = udp_tunnel_handle_offloads(skb, csum);
+ if (IS_ERR(skb)) {
+ err = PTR_ERR(skb);
+ goto free_rt;
+ }
+
+ gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len);
+ gnvh->ver = GENEVE_VER;
+ gnvh->opt_len = opt_len / 4;
+ gnvh->oam = !!(tun_flags & TUNNEL_OAM);
+ gnvh->critical = !!(tun_flags & TUNNEL_CRIT_OPT);
+ gnvh->rsvd1 = 0;
+ memcpy(gnvh->vni, vni, 3);
+ gnvh->proto_type = htons(ETH_P_TEB);
+ gnvh->rsvd2 = 0;
+ memcpy(gnvh->options, opt, opt_len);
+
+ skb_set_inner_protocol(skb, htons(ETH_P_TEB));
return 0;
+
+free_rt:
+ ip_rt_put(rt);
+ return err;
}
static struct rtable *geneve_get_rt(struct sk_buff *skb,
ip_rt_put(rt);
return ERR_PTR(-EINVAL);
}
-
return rt;
}
struct geneve_sock *gs = geneve->sock;
struct ip_tunnel_info *info = NULL;
struct rtable *rt = NULL;
- const struct iphdr *iip; /* interior IP header */
struct flowi4 fl4;
__u8 tos, ttl;
__be16 sport;
- bool xnet;
+ bool udp_csum;
+ __be16 df;
int err;
- sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
-
if (geneve->collect_md) {
info = skb_tunnel_info(skb);
if (unlikely(info && info->mode != IP_TUNNEL_INFO_TX)) {
dev->stats.tx_carrier_errors++;
goto tx_error;
}
+
+ sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
skb_reset_mac_header(skb);
- xnet = !net_eq(geneve->net, dev_net(geneve->dev));
if (info) {
const struct ip_tunnel_key *key = &info->key;
- bool udp_csum;
u8 *opts = NULL;
u8 vni[3];
- __be16 df;
tunnel_id_to_vni(key->tun_id, vni);
- df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
- udp_csum = !!(key->tun_flags & TUNNEL_CSUM);
-
if (key->tun_flags & TUNNEL_GENEVE_OPT)
opts = ip_tunnel_info_opts(info, info->options_len);
- err = geneve_xmit_skb(gs, rt, skb, fl4.saddr, fl4.daddr,
- key->tos, key->ttl, df,
- sport, geneve->dst_port,
- key->tun_flags, vni,
- info->options_len, opts, udp_csum, xnet);
+ udp_csum = !!(key->tun_flags & TUNNEL_CSUM);
+ err = geneve_build_skb(rt, skb, key->tun_flags, vni,
+ info->options_len, opts, udp_csum);
+ if (unlikely(err))
+ goto err;
+
+ tos = key->tos;
+ ttl = key->ttl;
+ df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
} else {
+ const struct iphdr *iip; /* interior IP header */
+
+ udp_csum = false;
+ err = geneve_build_skb(rt, skb, 0, geneve->vni,
+ 0, NULL, udp_csum);
+ if (unlikely(err))
+ goto err;
+
iip = ip_hdr(skb);
tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, iip, skb);
-
ttl = geneve->ttl;
if (!ttl && IN_MULTICAST(ntohl(fl4.daddr)))
ttl = 1;
-
ttl = ttl ? : ip4_dst_hoplimit(&rt->dst);
-
- /* no need to handle local destination and encap bypass...yet... */
- err = geneve_xmit_skb(gs, rt, skb, fl4.saddr, fl4.daddr, tos,
- ttl, 0, sport, geneve->dst_port, 0,
- geneve->vni, 0, NULL, false, xnet);
+ df = 0;
}
- if (err < 0)
- ip_rt_put(rt);
+ err = udp_tunnel_xmit_skb(rt, gs->sock->sk, skb, fl4.saddr, fl4.daddr,
+ tos, ttl, df, sport, geneve->dst_port,
+ !net_eq(geneve->net, dev_net(geneve->dev)),
+ !udp_csum);
iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
return NETDEV_TX_OK;
tx_error:
- dev->stats.tx_errors++;
dev_kfree_skb(skb);
+err:
+ dev->stats.tx_errors++;
return NETDEV_TX_OK;
}
return 0;
}
+static struct geneve_dev *geneve_find_dev(struct geneve_net *gn,
+ __be16 dst_port,
+ __be32 rem_addr,
+ u8 vni[],
+ bool *tun_on_same_port,
+ bool *tun_collect_md)
+{
+ struct geneve_dev *geneve, *t;
+
+ *tun_on_same_port = false;
+ *tun_collect_md = false;
+ t = NULL;
+ list_for_each_entry(geneve, &gn->geneve_list, next) {
+ if (geneve->dst_port == dst_port) {
+ *tun_collect_md = geneve->collect_md;
+ *tun_on_same_port = true;
+ }
+ if (!memcmp(vni, geneve->vni, sizeof(geneve->vni)) &&
+ rem_addr == geneve->remote.sin_addr.s_addr &&
+ dst_port == geneve->dst_port)
+ t = geneve;
+ }
+ return t;
+}
+
static int geneve_configure(struct net *net, struct net_device *dev,
__be32 rem_addr, __u32 vni, __u8 ttl, __u8 tos,
__u16 dst_port, bool metadata)
{
struct geneve_net *gn = net_generic(net, geneve_net_id);
- struct geneve_dev *dummy, *geneve = netdev_priv(dev);
- struct hlist_head *vni_list_head;
- struct sockaddr_in remote; /* IPv4 address for link partner */
+ struct geneve_dev *t, *geneve = netdev_priv(dev);
+ bool tun_collect_md, tun_on_same_port;
__u32 hash;
int err;
if (metadata) {
- if (rtnl_dereference(gn->collect_md_tun))
- return -EEXIST;
- if (!list_empty(&gn->geneve_list))
- return -EPERM;
- } else {
- if (rtnl_dereference(gn->collect_md_tun))
- return -EPERM;
+ if (rem_addr || vni || tos || ttl)
+ return -EINVAL;
}
geneve->net = net;
if (IN_MULTICAST(ntohl(geneve->remote.sin_addr.s_addr)))
return -EINVAL;
- remote = geneve->remote;
- if (metadata) {
- if (rem_addr || vni || tos || ttl)
- return -EINVAL;
- }
-
- hash = geneve_net_vni_hash(geneve->vni);
- vni_list_head = &gn->vni_list[hash];
- hlist_for_each_entry_rcu(dummy, vni_list_head, hlist) {
- if (!memcmp(geneve->vni, dummy->vni, sizeof(dummy->vni)) &&
- !memcmp(&remote, &dummy->remote, sizeof(dummy->remote)) &&
- htons(dst_port) == dummy->dst_port) {
- return -EBUSY;
- }
- }
-
geneve->ttl = ttl;
geneve->tos = tos;
geneve->dst_port = htons(dst_port);
geneve->collect_md = metadata;
+ t = geneve_find_dev(gn, htons(dst_port), rem_addr, geneve->vni,
+ &tun_on_same_port, &tun_collect_md);
+ if (t)
+ return -EBUSY;
+
+ if (metadata) {
+ if (tun_on_same_port)
+ return -EPERM;
+ } else {
+ if (tun_collect_md)
+ return -EPERM;
+ }
+
err = register_netdevice(dev);
if (err)
return err;
list_add(&geneve->next, &gn->geneve_list);
+ hash = geneve_net_vni_hash(geneve->vni);
hlist_add_head_rcu(&geneve->hlist, &gn->vni_list[hash]);
-
- if (geneve->collect_md)
- rcu_assign_pointer(gn->collect_md_tun, geneve);
return 0;
}
{
struct geneve_dev *geneve = netdev_priv(dev);
- if (geneve->collect_md) {
- struct geneve_net *gn = net_generic(geneve->net, geneve_net_id);
-
- rcu_assign_pointer(gn->collect_md_tun, NULL);
- }
-
if (!hlist_unhashed(&geneve->hlist))
hlist_del_rcu(&geneve->hlist);
INIT_LIST_HEAD(&gn->geneve_list);
+ INIT_LIST_HEAD(&gn->sock_list);
for (h = 0; h < VNI_HASH_SIZE; ++h)
INIT_HLIST_HEAD(&gn->vni_list[h]);
+++ /dev/null
-/*
- * Geneve: Generic Network Virtualization Encapsulation
- *
- * Copyright (c) 2014 Nicira, Inc.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/kernel.h>
-#include <linux/types.h>
-#include <linux/module.h>
-#include <linux/errno.h>
-#include <linux/slab.h>
-#include <linux/skbuff.h>
-#include <linux/list.h>
-#include <linux/netdevice.h>
-#include <linux/in.h>
-#include <linux/ip.h>
-#include <linux/udp.h>
-#include <linux/igmp.h>
-#include <linux/etherdevice.h>
-#include <linux/if_ether.h>
-#include <linux/if_vlan.h>
-#include <linux/ethtool.h>
-#include <linux/mutex.h>
-#include <net/arp.h>
-#include <net/ndisc.h>
-#include <net/ip.h>
-#include <net/ip_tunnels.h>
-#include <net/icmp.h>
-#include <net/udp.h>
-#include <net/rtnetlink.h>
-#include <net/route.h>
-#include <net/dsfield.h>
-#include <net/inet_ecn.h>
-#include <net/net_namespace.h>
-#include <net/netns/generic.h>
-#include <net/geneve.h>
-#include <net/protocol.h>
-#include <net/udp_tunnel.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
-
-/* Protects sock_list and refcounts. */
-static DEFINE_MUTEX(geneve_mutex);
-
-/* per-network namespace private data for this module */
-struct geneve_net {
- struct list_head sock_list;
-};
-
-static int geneve_net_id;
-
-static struct geneve_sock *geneve_find_sock(struct net *net,
- sa_family_t family, __be16 port)
-{
- struct geneve_net *gn = net_generic(net, geneve_net_id);
- struct geneve_sock *gs;
-
- list_for_each_entry(gs, &gn->sock_list, list) {
- if (inet_sk(gs->sock->sk)->inet_sport == port &&
- inet_sk(gs->sock->sk)->sk.sk_family == family)
- return gs;
- }
-
- return NULL;
-}
-
-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);
-}
-
-/* Transmit a fully formatted Geneve frame.
- *
- * When calling this function. The skb->data should point
- * to the geneve header which is fully formed.
- *
- * This function will add other UDP tunnel headers.
- */
-int geneve_xmit_skb(struct geneve_sock *gs, struct rtable *rt,
- struct sk_buff *skb, __be32 src, __be32 dst, __u8 tos,
- __u8 ttl, __be16 df, __be16 src_port, __be16 dst_port,
- __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt,
- bool csum, bool xnet)
-{
- struct genevehdr *gnvh;
- int min_headroom;
- int err;
-
- 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)) {
- kfree_skb(skb);
- return err;
- }
-
- skb = vlan_hwaccel_push_inside(skb);
- if (unlikely(!skb))
- return -ENOMEM;
-
- skb = udp_tunnel_handle_offloads(skb, csum);
- if (IS_ERR(skb))
- return PTR_ERR(skb);
-
- gnvh = (struct genevehdr *)__skb_push(skb, sizeof(*gnvh) + opt_len);
- geneve_build_header(gnvh, tun_flags, vni, opt_len, opt);
-
- skb_set_inner_protocol(skb, htons(ETH_P_TEB));
-
- return udp_tunnel_xmit_skb(rt, gs->sock->sk, skb, src, dst,
- tos, ttl, df, src_port, dst_port, xnet,
- !csum);
-}
-EXPORT_SYMBOL_GPL(geneve_xmit_skb);
-
-static int geneve_hlen(struct genevehdr *gh)
-{
- return sizeof(*gh) + gh->opt_len * 4;
-}
-
-static struct sk_buff **geneve_gro_receive(struct sk_buff **head,
- struct sk_buff *skb,
- struct udp_offload *uoff)
-{
- struct sk_buff *p, **pp = NULL;
- struct genevehdr *gh, *gh2;
- unsigned int hlen, gh_len, off_gnv;
- const struct packet_offload *ptype;
- __be16 type;
- int flush = 1;
-
- off_gnv = skb_gro_offset(skb);
- hlen = off_gnv + sizeof(*gh);
- gh = skb_gro_header_fast(skb, off_gnv);
- if (skb_gro_header_hard(skb, hlen)) {
- gh = skb_gro_header_slow(skb, hlen, off_gnv);
- if (unlikely(!gh))
- goto out;
- }
-
- if (gh->ver != GENEVE_VER || gh->oam)
- goto out;
- gh_len = geneve_hlen(gh);
-
- hlen = off_gnv + gh_len;
- if (skb_gro_header_hard(skb, hlen)) {
- gh = skb_gro_header_slow(skb, hlen, off_gnv);
- if (unlikely(!gh))
- goto out;
- }
-
- flush = 0;
-
- for (p = *head; p; p = p->next) {
- if (!NAPI_GRO_CB(p)->same_flow)
- continue;
-
- gh2 = (struct genevehdr *)(p->data + off_gnv);
- if (gh->opt_len != gh2->opt_len ||
- memcmp(gh, gh2, gh_len)) {
- NAPI_GRO_CB(p)->same_flow = 0;
- continue;
- }
- }
-
- type = gh->proto_type;
-
- rcu_read_lock();
- ptype = gro_find_receive_by_type(type);
- if (!ptype) {
- flush = 1;
- goto out_unlock;
- }
-
- skb_gro_pull(skb, gh_len);
- skb_gro_postpull_rcsum(skb, gh, gh_len);
- pp = ptype->callbacks.gro_receive(head, skb);
-
-out_unlock:
- rcu_read_unlock();
-out:
- NAPI_GRO_CB(skb)->flush |= flush;
-
- return pp;
-}
-
-static int geneve_gro_complete(struct sk_buff *skb, int nhoff,
- struct udp_offload *uoff)
-{
- struct genevehdr *gh;
- struct packet_offload *ptype;
- __be16 type;
- int gh_len;
- int err = -ENOSYS;
-
- udp_tunnel_gro_complete(skb, nhoff);
-
- gh = (struct genevehdr *)(skb->data + nhoff);
- gh_len = geneve_hlen(gh);
- type = gh->proto_type;
-
- rcu_read_lock();
- ptype = gro_find_complete_by_type(type);
- if (ptype)
- err = ptype->callbacks.gro_complete(skb, nhoff + gh_len);
-
- rcu_read_unlock();
- return err;
-}
-
-static void geneve_notify_add_rx_port(struct geneve_sock *gs)
-{
- struct sock *sk = gs->sock->sk;
- sa_family_t sa_family = sk->sk_family;
- int err;
-
- if (sa_family == AF_INET) {
- err = udp_add_offload(&gs->udp_offloads);
- if (err)
- pr_warn("geneve: udp_add_offload failed with status %d\n",
- err);
- }
-}
-
-static void geneve_notify_del_rx_port(struct geneve_sock *gs)
-{
- struct sock *sk = gs->sock->sk;
- sa_family_t sa_family = sk->sk_family;
-
- if (sa_family == AF_INET)
- udp_del_offload(&gs->udp_offloads);
-}
-
-/* Callback from net/ipv4/udp.c to receive packets */
-static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb)
-{
- struct genevehdr *geneveh;
- struct geneve_sock *gs;
- int opts_len;
-
- /* Need Geneve and inner Ethernet header to be present */
- if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN)))
- goto error;
-
- /* Return packets with reserved bits set */
- geneveh = geneve_hdr(skb);
-
- if (unlikely(geneveh->ver != GENEVE_VER))
- goto error;
-
- if (unlikely(geneveh->proto_type != htons(ETH_P_TEB)))
- goto error;
-
- opts_len = geneveh->opt_len * 4;
- if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len,
- htons(ETH_P_TEB)))
- goto drop;
-
- gs = rcu_dereference_sk_user_data(sk);
- if (!gs)
- goto drop;
-
- gs->rcv(gs, skb);
- return 0;
-
-drop:
- /* Consume bad packet */
- kfree_skb(skb);
- return 0;
-
-error:
- /* Let the UDP layer deal with the skb */
- return 1;
-}
-
-static struct socket *geneve_create_sock(struct net *net, bool ipv6,
- __be16 port)
-{
- struct socket *sock;
- struct udp_port_cfg udp_conf;
- int err;
-
- memset(&udp_conf, 0, sizeof(udp_conf));
-
- if (ipv6) {
- udp_conf.family = AF_INET6;
- } 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;
-}
-
-/* Create new listen socket if needed */
-static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port,
- geneve_rcv_t *rcv, void *data,
- bool ipv6)
-{
- struct geneve_net *gn = net_generic(net, geneve_net_id);
- struct geneve_sock *gs;
- struct socket *sock;
- struct udp_tunnel_sock_cfg tunnel_cfg;
-
- gs = kzalloc(sizeof(*gs), GFP_KERNEL);
- if (!gs)
- return ERR_PTR(-ENOMEM);
-
- sock = geneve_create_sock(net, ipv6, port);
- if (IS_ERR(sock)) {
- kfree(gs);
- return ERR_CAST(sock);
- }
-
- gs->sock = sock;
- gs->refcnt = 1;
- gs->rcv = rcv;
- gs->rcv_data = data;
-
- /* Initialize the geneve udp offloads structure */
- gs->udp_offloads.port = port;
- gs->udp_offloads.callbacks.gro_receive = geneve_gro_receive;
- gs->udp_offloads.callbacks.gro_complete = geneve_gro_complete;
- geneve_notify_add_rx_port(gs);
-
- /* Mark socket as an encapsulation socket */
- tunnel_cfg.sk_user_data = gs;
- tunnel_cfg.encap_type = 1;
- tunnel_cfg.encap_rcv = geneve_udp_encap_recv;
- tunnel_cfg.encap_destroy = NULL;
- setup_udp_tunnel_sock(net, sock, &tunnel_cfg);
-
- list_add(&gs->list, &gn->sock_list);
-
- return gs;
-}
-
-struct geneve_sock *geneve_sock_add(struct net *net, __be16 port,
- geneve_rcv_t *rcv, void *data,
- bool no_share, bool ipv6)
-{
- struct geneve_sock *gs;
-
- mutex_lock(&geneve_mutex);
-
- gs = geneve_find_sock(net, ipv6 ? AF_INET6 : AF_INET, port);
- if (gs) {
- if (!no_share && gs->rcv == rcv)
- gs->refcnt++;
- else
- gs = ERR_PTR(-EBUSY);
- } else {
- gs = geneve_socket_create(net, port, rcv, data, ipv6);
- }
-
- mutex_unlock(&geneve_mutex);
-
- return gs;
-}
-EXPORT_SYMBOL_GPL(geneve_sock_add);
-
-void geneve_sock_release(struct geneve_sock *gs)
-{
- mutex_lock(&geneve_mutex);
-
- if (--gs->refcnt)
- goto unlock;
-
- list_del(&gs->list);
- geneve_notify_del_rx_port(gs);
- udp_tunnel_sock_release(gs->sock);
- kfree_rcu(gs, rcu);
-
-unlock:
- mutex_unlock(&geneve_mutex);
-}
-EXPORT_SYMBOL_GPL(geneve_sock_release);
-
-static __net_init int geneve_init_net(struct net *net)
-{
- struct geneve_net *gn = net_generic(net, geneve_net_id);
-
- INIT_LIST_HEAD(&gn->sock_list);
-
- return 0;
-}
-
-static struct pernet_operations geneve_net_ops = {
- .init = geneve_init_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)
- return rc;
-
- pr_info("Geneve core logic\n");
-
- return 0;
-}
-module_init(geneve_init_module);
-
-static void __exit geneve_cleanup_module(void)
-{
- unregister_pernet_subsys(&geneve_net_ops);
-}
-module_exit(geneve_cleanup_module);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Jesse Gross <jesse@nicira.com>");
-MODULE_DESCRIPTION("Driver library for GENEVE encapsulated traffic");
projects / users / jedix / linux-maple.git / commitdiff