[ovs-dev] [PATCH 02/13] Upstream GRE : Refactor code GRE code.
Isaku Yamahata
yamahata at valinux.co.jp
Thu Dec 6 04:51:35 UTC 2012
On Thu, Nov 22, 2012 at 07:56:28AM -0800, Pravin B Shelar wrote:
> From: Pravin Shelar <pshelar at nicira.com>
>
> Following patch refactors GRE code into ip tunneling code and GRE
> specific code. This patch also introduces new tunneling protocol
> handler so that multiple modules are register protocol handler for
> same protocol simultaneously.
>
> Goal of this work is to reuse ip-tunneling part in other tunneling
> implementations. E.g. code related to device management, packet rx/tx.
>
> Signed-off-by: Pravin B Shelar <pshelar at nicira.com>
> ---
> include/linux/if_tunnel.h | 16 -
> include/net/gre.h | 9 +
> include/net/ipip.h | 153 +++++-
> net/ipv4/Kconfig | 6 +
> net/ipv4/Makefile | 1 +
> net/ipv4/gre.c | 247 +++++++-
> net/ipv4/ip_gre.c | 1602 ++++++++-------------------------------------
> net/ipv4/ip_tunnel.c | 1283 ++++++++++++++++++++++++++++++++++++
> net/ipv6/ip6_tunnel.c | 1 +
> 9 files changed, 1975 insertions(+), 1343 deletions(-)
> create mode 100644 net/ipv4/ip_tunnel.c
>
> diff --git a/include/linux/if_tunnel.h b/include/linux/if_tunnel.h
> index f4e56ec..9234965 100644
> --- a/include/linux/if_tunnel.h
> +++ b/include/linux/if_tunnel.h
> @@ -6,20 +6,4 @@
> #include <uapi/linux/if_tunnel.h>
> #include <linux/u64_stats_sync.h>
>
> -/*
> - * Locking : hash tables are protected by RCU and RTNL
> - */
> -
> -#define for_each_ip_tunnel_rcu(pos, start) \
> - for (pos = rcu_dereference(start); pos; pos = rcu_dereference(pos->next))
> -
> -/* often modified stats are per cpu, other are shared (netdev->stats) */
> -struct pcpu_tstats {
> - u64 rx_packets;
> - u64 rx_bytes;
> - u64 tx_packets;
> - u64 tx_bytes;
> - struct u64_stats_sync syncp;
> -};
> -
> #endif /* _IF_TUNNEL_H_ */
> diff --git a/include/net/gre.h b/include/net/gre.h
> index 8266547..dda547a 100644
> --- a/include/net/gre.h
> +++ b/include/net/gre.h
> @@ -2,6 +2,7 @@
> #define __LINUX_GRE_H
>
> #include <linux/skbuff.h>
> +#include <net/ipip.h>
>
> #define GREPROTO_CISCO 0
> #define GREPROTO_PPTP 1
> @@ -15,4 +16,12 @@ struct gre_protocol {
> int gre_add_protocol(const struct gre_protocol *proto, u8 version);
> int gre_del_protocol(const struct gre_protocol *proto, u8 version);
>
> +struct sk_buff *gre_build_header(struct sk_buff *skb,
> + const struct tnl_ptk_info *tpi);
> +struct gre_base_hdr {
> + __be16 flags;
> + __be16 protocol;
> +};
> +#define GRE_HEADER_SECTION 4
> +
> #endif
> diff --git a/include/net/ipip.h b/include/net/ipip.h
> index 21947cf..a14bde8 100644
> --- a/include/net/ipip.h
> +++ b/include/net/ipip.h
> @@ -2,7 +2,9 @@
> #define __NET_IPIP_H 1
>
> #include <linux/if_tunnel.h>
> +#include <net/dsfield.h>
> #include <net/gro_cells.h>
> +#include <net/inet_ecn.h>
> #include <net/ip.h>
>
> /* Keep error state on tunnel for 30 sec */
> @@ -26,7 +28,7 @@ struct ip_tunnel {
> /* These four fields used only by GRE */
> __u32 i_seqno; /* The last seen seqno */
> __u32 o_seqno; /* The last output seqno */
> - int hlen; /* Precalculated GRE header length */
> + int hlen; /* Precalculated header length */
> int mlink;
>
> struct ip_tunnel_parm parms;
> @@ -37,10 +39,31 @@ struct ip_tunnel {
> #endif
> struct ip_tunnel_prl_entry __rcu *prl; /* potential router list */
> unsigned int prl_count; /* # of entries in PRL */
> -
> + int ipt_net_id;
> struct gro_cells gro_cells;
> };
>
> +/*
> + * Locking : hash tables are protected by RCU and RTNL
> + */
> +
> +#define for_each_ip_tunnel_rcu(t, start) \
> + for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
> +
> +
> +#define TUNNEL_CSUM __cpu_to_be16(0x8000)
> +#define TUNNEL_KEY __cpu_to_be16(0x2000)
> +#define TUNNEL_SEQ __cpu_to_be16(0x1000)
> +
> +struct tnl_ptk_info {
> + __be16 flags;
> + __be16 proto;
> + __be32 key;
> + __be32 seq;
> + int hdr_len;
> + __sum16 csum;
> +};
> +
> struct ip_tunnel_prl_entry {
> struct ip_tunnel_prl_entry __rcu *next;
> __be32 addr;
> @@ -48,6 +71,14 @@ struct ip_tunnel_prl_entry {
> struct rcu_head rcu_head;
> };
>
> +struct pcpu_tstats {
> + u64 rx_packets;
> + u64 rx_bytes;
> + u64 tx_packets;
> + u64 tx_bytes;
> + struct u64_stats_sync syncp;
> +};
> +
> static inline void iptunnel_xmit(struct sk_buff *skb, struct net_device *dev)
> {
> int err;
> @@ -71,4 +102,122 @@ static inline void iptunnel_xmit(struct sk_buff *skb, struct net_device *dev)
> }
> }
>
> +#define HASH_ON_KEY 1
> +struct ip_tunnel_ops {
> + u32 flags;
> + int (*parse_netlink_parms)(struct ip_tunnel *vxlan,
> + struct nlattr *data[],
> + struct nlattr *tb[],
> + struct ip_tunnel_parm *parms);
const to data and tb
> + int (*get_ioctl_param)(struct net_device *dev,
> + struct ifreq *ifr,
> + struct ip_tunnel_parm *p);
> +};
> +
> +#define IPT_HASH_BITS 10
> +#define IPT_HASH_SIZE (1 << IPT_HASH_BITS)
> +
> +struct ip_tunnel_net {
> + struct ip_tunnel __rcu **tunnels;
> + struct net_device *fb_tunnel_dev;
> + const struct ip_tunnel_ops *ops;
> +};
> +
> +enum ipt_type {
> + IPT_GRE,
> + IPT_VXLAN,
> + IPT_MAX,
> +};
> +
> +struct ipt_protocol {
> + int (*handler)(struct sk_buff *skb, const struct tnl_ptk_info *tpi);
> + int (*err_handler)(struct sk_buff *skb, u32 info,
> + const struct tnl_ptk_info *tpi);
> + u16 portno;
> + u8 type;
> + u8 priority;
> + struct hlist_node node;
> +};
> +
> +#define IPT_HASH_BUCKETS 16
> +extern struct hlist_head ipt_proto[IPT_HASH_BUCKETS];
> +int ipt_add_protocol(struct ipt_protocol *proto);
> +void ipt_del_protocol(struct ipt_protocol *proto);
> +static inline struct hlist_head *ipt_hash_bucket(u8 type, u16 portno)
> +{
> + return &ipt_proto[(type << 8 | portno) & (IPT_HASH_BUCKETS - 1)];
> +}
> +
> +int ip_tunnel_init(struct net_device *dev);
> +void ip_tunnel_uninit(struct net_device *dev);
> +void ip_tunnel_dev_free(struct net_device *dev);
> +void ip_tunnel_dellink(struct net_device *dev, struct list_head *head);
> +int __net_init ip_tunnel_init_net(struct net *net, int ipt_net_id,
> + struct rtnl_link_ops *ops);
> +
> +void __net_exit ip_tunnel_delete_net(struct ip_tunnel_net *itn);
> +
> +void ip_tunnel_err(struct ip_tunnel *t, struct sk_buff *skb, u32 info);
> +
> +int ip_tunnel_xmit(struct sk_buff *skb,
> + const struct iphdr *tiph,
> + const struct tnl_ptk_info *tpi,
> + struct sk_buff * (*build_header)(struct sk_buff *skb,
> + const struct tnl_ptk_info *tpi));
> +
> +int ip_tunnel_build_iphdr(struct sk_buff *skb, struct net_device *dev,
> + const struct iphdr *tiph, int hlen,
> + struct iphdr *niph);
> +int ip_tunnel_bind_dev(struct net_device *dev);
> +int ip_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);
> +int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu);
> +
> +struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev,
> + struct rtnl_link_stats64 *tot);
> +void ip_tunnel_link(struct ip_tunnel_net *itn, struct ip_tunnel *t);
> +void ip_tunnel_unlink(struct ip_tunnel_net *itn, struct ip_tunnel *t);
> +struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn,
> + int link, __be16 flags,
> + __be32 remote, __be32 local,
> + __be32 key);
> +struct ip_tunnel *ip_tunnel_lookup_key(struct ip_tunnel_net *itn, __be32 key);
> +struct ip_tunnel *ip_tunnel_find(struct ip_tunnel_net *itn,
> + struct ip_tunnel_parm *parms,
> + int type);
> +
> +int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb,
> + const struct tnl_ptk_info *tpi, bool log_ecn_error);
> +int ip_tunnel_newlink(struct net *src_net, struct net_device *dev,
> + struct nlattr *tb[],
> + struct nlattr *data[]);
> +int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[],
> + struct nlattr *data[]);
> +
> +static inline void ip_tunnel_setup(struct net_device *dev, int net_id)
> +{
> + struct ip_tunnel *tunnel = netdev_priv(dev);
> + tunnel->ipt_net_id = net_id;
> +}
> +
> +/* Extract dsfield from inner protocol */
> +static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph,
> + const struct sk_buff *skb)
> +{
> + if (skb->protocol == htons(ETH_P_IP))
> + return iph->tos;
> + else if (skb->protocol == htons(ETH_P_IPV6))
> + return ipv6_get_dsfield((const struct ipv6hdr *)iph);
> + else
> + return 0;
> +}
> +
> +/* Propogate ECN bits out */
> +static inline u8 ip_tunnel_ecn_encap(u8 tos,
> + const struct iphdr *iph,
> + const struct sk_buff *skb)
> +{
> + u8 inner = ip_tunnel_get_dsfield(iph, skb);
> +
> + return INET_ECN_encapsulate(tos, inner);
> +}
> #endif
> diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig
> index 5a19aeb..4110ff3 100644
> --- a/net/ipv4/Kconfig
> +++ b/net/ipv4/Kconfig
> @@ -166,6 +166,7 @@ config IP_PNP_RARP
> config NET_IPIP
> tristate "IP: tunneling"
> select INET_TUNNEL
> + select NET_IP_TUNNEL
> ---help---
> Tunneling means encapsulating data of one protocol type within
> another protocol and sending it over a channel that understands the
> @@ -186,9 +187,14 @@ config NET_IPGRE_DEMUX
> This is helper module to demultiplex GRE packets on GRE version field criteria.
> Required by ip_gre and pptp modules.
>
> +config NET_IP_TUNNEL
> + tristate
> + default n
> +
> config NET_IPGRE
> tristate "IP: GRE tunnels over IP"
> depends on (IPV6 || IPV6=n) && NET_IPGRE_DEMUX
> + select NET_IP_TUNNEL
> help
> Tunneling means encapsulating data of one protocol type within
> another protocol and sending it over a channel that understands the
> diff --git a/net/ipv4/Makefile b/net/ipv4/Makefile
> index 15ca63e..089cb9f 100644
> --- a/net/ipv4/Makefile
> +++ b/net/ipv4/Makefile
> @@ -13,6 +13,7 @@ obj-y := route.o inetpeer.o protocol.o \
> fib_frontend.o fib_semantics.o fib_trie.o \
> inet_fragment.o ping.o
>
> +obj-$(CONFIG_NET_IP_TUNNEL) += ip_tunnel.o
> obj-$(CONFIG_SYSCTL) += sysctl_net_ipv4.o
> obj-$(CONFIG_PROC_FS) += proc.o
> obj-$(CONFIG_IP_MULTIPLE_TABLES) += fib_rules.o
> diff --git a/net/ipv4/gre.c b/net/ipv4/gre.c
> index 5a903dc..b837551 100644
> --- a/net/ipv4/gre.c
> +++ b/net/ipv4/gre.c
> @@ -16,13 +16,16 @@
> #include <linux/kernel.h>
> #include <linux/kmod.h>
> #include <linux/skbuff.h>
> +#include <linux/if.h>
> +#include <linux/icmp.h>
> #include <linux/in.h>
> #include <linux/ip.h>
> +#include <linux/if_tunnel.h>
> #include <linux/netdevice.h>
> #include <linux/spinlock.h>
> #include <net/protocol.h>
> #include <net/gre.h>
> -
> +#include <net/icmp.h>
>
> static const struct gre_protocol __rcu *gre_proto[GREPROTO_MAX] __read_mostly;
>
> @@ -104,12 +107,241 @@ static void gre_err(struct sk_buff *skb, u32 info)
> rcu_read_unlock();
> }
>
> +struct sk_buff *gre_build_header(struct sk_buff *skb,
> + const struct tnl_ptk_info *tpi)
> +{
> + struct iphdr *iph = ip_hdr(skb);
> + struct gre_base_hdr *greh = (struct gre_base_hdr *)&iph[1];
> + struct dst_entry *dst = skb_dst(skb);
> +
> + greh->flags = tpi->flags;
> + greh->protocol = tpi->proto;
> + if (tpi->flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) {
> + __be32 *ptr = (__be32 *)(((u8 *)greh) + tpi->hdr_len - 4);
> +
> + if (tpi->flags&GRE_SEQ) {
> + *ptr = tpi->seq;
> + ptr--;
> + }
> + if (tpi->flags&GRE_KEY) {
> + *ptr = tpi->key;
> + ptr--;
> + }
> + if (tpi->flags&GRE_CSUM) {
> + *(__sum16 *)ptr = 0;
> + *(__sum16 *)ptr = csum_fold(skb_checksum(skb,
> + skb_transport_offset(skb),
> + skb->len - skb_transport_offset(skb),
> + 0));
> + }
> + }
> + skb->local_df = 1;
> + __ip_select_ident(ip_hdr(skb), dst, 0);
> +
> + return skb;
> +}
> +EXPORT_SYMBOL(gre_build_header);
> +
> +
> +static __sum16 check_checksum(struct sk_buff *skb)
> +{
> + struct iphdr *iph = ip_hdr(skb);
> + struct gre_base_hdr *greh = (struct gre_base_hdr *)(iph + 1);
> + __sum16 csum = 0;
> +
> + if (greh->flags & GRE_CSUM) {
> + switch (skb->ip_summed) {
> + case CHECKSUM_COMPLETE:
> + csum = csum_fold(skb->csum);
> +
> + if (!csum)
> + break;
> + /* Fall through. */
> +
> + case CHECKSUM_NONE:
> + skb->csum = 0;
> + csum = __skb_checksum_complete(skb);
> + skb->ip_summed = CHECKSUM_COMPLETE;
> + break;
> + }
> + }
> +
> + return csum;
> +}
> +
> +static int parse_gre_header(struct sk_buff *skb, struct tnl_ptk_info *tpi)
> +{
> + struct gre_base_hdr *greh = (struct gre_base_hdr *)skb->data;
> + __be32 *options = (__be32 *)(greh + 1);
> +
> + if (unlikely(greh->flags & (GRE_VERSION | GRE_ROUTING)))
> + return -EINVAL;
> +
> + tpi->flags = greh->flags;
> + tpi->proto = greh->protocol;
> +
> + tpi->hdr_len = GRE_HEADER_SECTION;
> + tpi->csum = check_checksum(skb);
> +
> + if (tpi->csum)
> + return -EINVAL;
> +
> + if (greh->flags & GRE_CSUM) {
> + tpi->hdr_len += GRE_HEADER_SECTION;
> + options++;
> + }
> +
> + if (greh->flags & GRE_KEY) {
> + if ((void *)(options + 1) > (void *)skb_tail_pointer(skb))
> + return -1;
> + tpi->hdr_len += GRE_HEADER_SECTION;
> + tpi->key = *options;
> + options++;
> + } else
> + tpi->key = 0;
> +
> + if (unlikely(greh->flags & GRE_SEQ)) {
> + if ((void *) (options + 1) > (void *)skb_tail_pointer(skb))
> + return -1;
> +
> + tpi->seq = *options;
> + tpi->hdr_len += GRE_HEADER_SECTION;
> + options++;
> + } else
> + tpi->seq = 0;
> +
> + /* WCCP version 1 and 2 protocol decoding.
> + * - Change protocol to IP
> + * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header
> + */
> + if (tpi->flags == 0 && tpi->proto == htons(ETH_P_WCCP)) {
> + tpi->proto = htons(ETH_P_IP);
> + if ((*(u8 *)options & 0xF0) != 0x40)
> + tpi->hdr_len += 4;
> + }
> +
> + return 0;
> +}
> +
> +static int ipgre_rcv_v0(struct sk_buff *skb)
> +{
> + struct tnl_ptk_info tpi;
> + struct ipt_protocol *proto;
> + struct hlist_node *n;
> + struct hlist_head *head;
> +
> + if (!pskb_may_pull(skb, 16))
> + goto drop;
> +
> + if (parse_gre_header(skb, &tpi) < 0)
> + goto drop;
> +
> + head = ipt_hash_bucket(IPT_GRE, 0);
> + hlist_for_each_entry_rcu(proto, n, head, node) {
> + int ret;
> +
> + if (proto->type != IPT_GRE || proto->portno != 0)
> + continue;
> + ret = proto->handler(skb, &tpi);
> + if (ret <= 0)
> + return ret;
> +
> + }
> + icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
> +
> +drop:
> + kfree_skb(skb);
> + return 0;
> +}
> +
> +static void ipgre_err_v0(struct sk_buff *skb, u32 info)
> +{
> +
> + /* All the routers (except for Linux) return only
> + * 8 bytes of packet payload. It means, that precise relaying of
> + * ICMP in the real Internet is absolutely infeasible.
> + *
> + * Moreover, Cisco "wise men" put GRE key to the third word
> + * in GRE header. It makes impossible maintaining even soft
> + * state for keyed
> + * GRE tunnels with enabled checksum. Tell them "thank you".
> + *
> + * Well, I wonder, rfc1812 was written by Cisco employee,
> + * what the hell these idiots break standards established
> + * by themselves???
> + */
> +
> + const int type = icmp_hdr(skb)->type;
> + const int code = icmp_hdr(skb)->code;
> + struct tnl_ptk_info tpi;
> + struct hlist_node *n;
> + struct hlist_head *head;
> + struct ipt_protocol *proto;
> +
> + if (!pskb_may_pull(skb, sizeof(struct gre_base_hdr) + ETH_HLEN))
> + return;
> +
> + parse_gre_header(skb, &tpi);
> +
> + if (tpi.csum)
> + return;
> +
> + /* If only 8 bytes returned, keyed message will be dropped here */
> + if (tpi.flags & GRE_KEY) {
> + if ((tpi.flags & GRE_CSUM) && (tpi.hdr_len < 12))
> + return;
> + if (tpi.hdr_len < 8)
> + return;
> + }
> +
> + switch (type) {
> + default:
> + case ICMP_PARAMETERPROB:
> + return;
> +
> + case ICMP_DEST_UNREACH:
> + switch (code) {
> + case ICMP_SR_FAILED:
> + case ICMP_PORT_UNREACH:
> + /* Impossible event. */
> + return;
> + default:
> + /* All others are translated to HOST_UNREACH.
> + rfc2003 contains "deep thoughts" about NET_UNREACH,
> + I believe they are just ether pollution. --ANK
> + */
> + break;
> + }
> + break;
> + case ICMP_TIME_EXCEEDED:
> + if (code != ICMP_EXC_TTL)
> + return;
> + break;
> +
> + case ICMP_REDIRECT:
> + break;
> + }
> +
> + head = ipt_hash_bucket(IPT_GRE, 0);
> + hlist_for_each_entry_rcu(proto, n, head, node) {
> + if (proto->type != IPT_GRE || proto->portno != 0)
> + continue;
> + if (proto->err_handler(skb, info, &tpi) <= 0)
> + return;
> + }
> +}
> +
> static const struct net_protocol net_gre_protocol = {
> .handler = gre_rcv,
> .err_handler = gre_err,
> .netns_ok = 1,
> };
>
> +static const struct gre_protocol ipgre_protocol = {
> + .handler = ipgre_rcv_v0,
> + .err_handler = ipgre_err_v0,
> +};
> +
> static int __init gre_init(void)
> {
> pr_info("GRE over IPv4 demultiplexor driver\n");
> @@ -118,12 +350,25 @@ static int __init gre_init(void)
> pr_err("can't add protocol\n");
> return -EAGAIN;
> }
> + rtnl_lock();
> + if (gre_add_protocol(&ipgre_protocol, GREPROTO_CISCO) < 0) {
> + pr_info("%s: can't add ipgre handler\n", __func__);
> + rtnl_unlock();
> + inet_del_protocol(&net_gre_protocol, IPPROTO_GRE);
> + return -EAGAIN;
> + }
> + rtnl_unlock();
>
> return 0;
> }
>
> static void __exit gre_exit(void)
> {
> + rtnl_lock();
> + if (gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO) < 0)
> + pr_info("%s: can't remove protocol\n", __func__);
> + rtnl_unlock();
> +
> inet_del_protocol(&net_gre_protocol, IPPROTO_GRE);
> }
>
> diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
> index 0d4eecd..829fe3d 100644
> --- a/net/ipv4/ip_gre.c
> +++ b/net/ipv4/ip_gre.c
> @@ -124,1055 +124,147 @@ 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");
>
> -static struct rtnl_link_ops ipgre_link_ops __read_mostly;
> -static int ipgre_tunnel_init(struct net_device *dev);
> -static void ipgre_tunnel_setup(struct net_device *dev);
> -static int ipgre_tunnel_bind_dev(struct net_device *dev);
> -
> /* Fallback tunnel: no source, no destination, no key, no options */
>
> #define HASH_SIZE 16
>
> static int ipgre_net_id __read_mostly;
> -struct ipgre_net {
> - struct ip_tunnel __rcu *tunnels[4][HASH_SIZE];
> -
> - struct net_device *fb_tunnel_dev;
> -};
> -
> -/* Tunnel hash table */
> -
> -/*
> - 4 hash tables:
> -
> - 3: (remote,local)
> - 2: (remote,*)
> - 1: (*,local)
> - 0: (*,*)
> -
> - We require exact key match i.e. if a key is present in packet
> - it will match only tunnel with the same key; if it is not present,
> - it will match only keyless tunnel.
> -
> - All keysless packets, if not matched configured keyless tunnels
> - will match fallback tunnel.
> - */
> -
> -#define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF)
> -
> -#define tunnels_r_l tunnels[3]
> -#define tunnels_r tunnels[2]
> -#define tunnels_l tunnels[1]
> -#define tunnels_wc tunnels[0]
> -
> -static struct rtnl_link_stats64 *ipgre_get_stats64(struct net_device *dev,
> - struct rtnl_link_stats64 *tot)
> -{
> - int i;
> -
> - for_each_possible_cpu(i) {
> - const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i);
> - u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
> - unsigned int start;
> -
> - do {
> - start = u64_stats_fetch_begin_bh(&tstats->syncp);
> - rx_packets = tstats->rx_packets;
> - tx_packets = tstats->tx_packets;
> - rx_bytes = tstats->rx_bytes;
> - tx_bytes = tstats->tx_bytes;
> - } while (u64_stats_fetch_retry_bh(&tstats->syncp, start));
> -
> - tot->rx_packets += rx_packets;
> - tot->tx_packets += tx_packets;
> - tot->rx_bytes += rx_bytes;
> - tot->tx_bytes += tx_bytes;
> - }
> -
> - tot->multicast = dev->stats.multicast;
> - tot->rx_crc_errors = dev->stats.rx_crc_errors;
> - tot->rx_fifo_errors = dev->stats.rx_fifo_errors;
> - tot->rx_length_errors = dev->stats.rx_length_errors;
> - tot->rx_frame_errors = dev->stats.rx_frame_errors;
> - tot->rx_errors = dev->stats.rx_errors;
> -
> - tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
> - tot->tx_carrier_errors = dev->stats.tx_carrier_errors;
> - tot->tx_dropped = dev->stats.tx_dropped;
> - tot->tx_aborted_errors = dev->stats.tx_aborted_errors;
> - tot->tx_errors = dev->stats.tx_errors;
> -
> - return tot;
> -}
> -
> -/* Does key in tunnel parameters match packet */
> -static bool ipgre_key_match(const struct ip_tunnel_parm *p,
> - __be16 flags, __be32 key)
> -{
> - if (p->i_flags & GRE_KEY) {
> - if (flags & GRE_KEY)
> - return key == p->i_key;
> - else
> - return false; /* key expected, none present */
> - } else
> - return !(flags & GRE_KEY);
> -}
> -
> -/* Given src, dst and key, find appropriate for input tunnel. */
> -
> -static struct ip_tunnel *ipgre_tunnel_lookup(struct net_device *dev,
> - __be32 remote, __be32 local,
> - __be16 flags, __be32 key,
> - __be16 gre_proto)
> -{
> - struct net *net = dev_net(dev);
> - int link = dev->ifindex;
> - unsigned int h0 = HASH(remote);
> - unsigned int h1 = HASH(key);
> - struct ip_tunnel *t, *cand = NULL;
> - struct ipgre_net *ign = net_generic(net, ipgre_net_id);
> - int dev_type = (gre_proto == htons(ETH_P_TEB)) ?
> - ARPHRD_ETHER : ARPHRD_IPGRE;
> - int score, cand_score = 4;
> -
> - for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
> - if (local != t->parms.iph.saddr ||
> - remote != t->parms.iph.daddr ||
> - !(t->dev->flags & IFF_UP))
> - continue;
> -
> - if (!ipgre_key_match(&t->parms, flags, key))
> - continue;
> -
> - if (t->dev->type != ARPHRD_IPGRE &&
> - t->dev->type != dev_type)
> - continue;
> -
> - score = 0;
> - if (t->parms.link != link)
> - score |= 1;
> - if (t->dev->type != dev_type)
> - score |= 2;
> - if (score == 0)
> - return t;
> -
> - if (score < cand_score) {
> - cand = t;
> - cand_score = score;
> - }
> - }
> -
> - for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
> - if (remote != t->parms.iph.daddr ||
> - !(t->dev->flags & IFF_UP))
> - continue;
> -
> - if (!ipgre_key_match(&t->parms, flags, key))
> - continue;
> -
> - if (t->dev->type != ARPHRD_IPGRE &&
> - t->dev->type != dev_type)
> - continue;
> -
> - score = 0;
> - if (t->parms.link != link)
> - score |= 1;
> - if (t->dev->type != dev_type)
> - score |= 2;
> - if (score == 0)
> - return t;
> -
> - if (score < cand_score) {
> - cand = t;
> - cand_score = score;
> - }
> - }
> -
> - for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
> - if ((local != t->parms.iph.saddr &&
> - (local != t->parms.iph.daddr ||
> - !ipv4_is_multicast(local))) ||
> - !(t->dev->flags & IFF_UP))
> - continue;
> -
> - if (!ipgre_key_match(&t->parms, flags, key))
> - continue;
> -
> - if (t->dev->type != ARPHRD_IPGRE &&
> - t->dev->type != dev_type)
> - continue;
> -
> - score = 0;
> - if (t->parms.link != link)
> - score |= 1;
> - if (t->dev->type != dev_type)
> - score |= 2;
> - if (score == 0)
> - return t;
> -
> - if (score < cand_score) {
> - cand = t;
> - cand_score = score;
> - }
> - }
> -
> - for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
> - if (t->parms.i_key != key ||
> - !(t->dev->flags & IFF_UP))
> - continue;
> -
> - if (t->dev->type != ARPHRD_IPGRE &&
> - t->dev->type != dev_type)
> - continue;
> -
> - score = 0;
> - if (t->parms.link != link)
> - score |= 1;
> - if (t->dev->type != dev_type)
> - score |= 2;
> - if (score == 0)
> - return t;
> -
> - if (score < cand_score) {
> - cand = t;
> - cand_score = score;
> - }
> - }
> -
> - if (cand != NULL)
> - return cand;
> -
> - dev = ign->fb_tunnel_dev;
> - if (dev->flags & IFF_UP)
> - return netdev_priv(dev);
> -
> - return NULL;
> -}
> -
> -static struct ip_tunnel __rcu **__ipgre_bucket(struct ipgre_net *ign,
> - struct ip_tunnel_parm *parms)
> -{
> - __be32 remote = parms->iph.daddr;
> - __be32 local = parms->iph.saddr;
> - __be32 key = parms->i_key;
> - unsigned int h = HASH(key);
> - int prio = 0;
> -
> - if (local)
> - prio |= 1;
> - if (remote && !ipv4_is_multicast(remote)) {
> - prio |= 2;
> - h ^= HASH(remote);
> - }
> -
> - return &ign->tunnels[prio][h];
> -}
> -
> -static inline struct ip_tunnel __rcu **ipgre_bucket(struct ipgre_net *ign,
> - struct ip_tunnel *t)
> -{
> - return __ipgre_bucket(ign, &t->parms);
> -}
> -
> -static void ipgre_tunnel_link(struct ipgre_net *ign, struct ip_tunnel *t)
> -{
> - struct ip_tunnel __rcu **tp = ipgre_bucket(ign, t);
> -
> - rcu_assign_pointer(t->next, rtnl_dereference(*tp));
> - rcu_assign_pointer(*tp, t);
> -}
> -
> -static void ipgre_tunnel_unlink(struct ipgre_net *ign, struct ip_tunnel *t)
> -{
> - struct ip_tunnel __rcu **tp;
> - struct ip_tunnel *iter;
> -
> - for (tp = ipgre_bucket(ign, t);
> - (iter = rtnl_dereference(*tp)) != NULL;
> - tp = &iter->next) {
> - if (t == iter) {
> - rcu_assign_pointer(*tp, t->next);
> - break;
> - }
> - }
> -}
> -
> -static struct ip_tunnel *ipgre_tunnel_find(struct net *net,
> - struct ip_tunnel_parm *parms,
> - int type)
> -{
> - __be32 remote = parms->iph.daddr;
> - __be32 local = parms->iph.saddr;
> - __be32 key = parms->i_key;
> - int link = parms->link;
> - struct ip_tunnel *t;
> - struct ip_tunnel __rcu **tp;
> - struct ipgre_net *ign = net_generic(net, ipgre_net_id);
> -
> - for (tp = __ipgre_bucket(ign, parms);
> - (t = rtnl_dereference(*tp)) != NULL;
> - tp = &t->next)
> - if (local == t->parms.iph.saddr &&
> - remote == t->parms.iph.daddr &&
> - key == t->parms.i_key &&
> - link == t->parms.link &&
> - type == t->dev->type)
> - break;
> -
> - return t;
> -}
> +static int ipgre_tap_net_id __read_mostly;
>
> -static struct ip_tunnel *ipgre_tunnel_locate(struct net *net,
> - struct ip_tunnel_parm *parms, int create)
> +static int ipgre_err(struct sk_buff *skb, u32 info,
> + const struct tnl_ptk_info *tpi)
> {
> - struct ip_tunnel *t, *nt;
> - struct net_device *dev;
> - char name[IFNAMSIZ];
> - struct ipgre_net *ign = net_generic(net, ipgre_net_id);
> -
> - t = ipgre_tunnel_find(net, parms, ARPHRD_IPGRE);
> - if (t || !create)
> - return t;
> -
> - if (parms->name[0])
> - strlcpy(name, parms->name, IFNAMSIZ);
> - else
> - strcpy(name, "gre%d");
> -
> - dev = alloc_netdev(sizeof(*t), name, ipgre_tunnel_setup);
> - if (!dev)
> - return NULL;
> -
> - dev_net_set(dev, net);
> -
> - nt = netdev_priv(dev);
> - nt->parms = *parms;
> - dev->rtnl_link_ops = &ipgre_link_ops;
> -
> - dev->mtu = ipgre_tunnel_bind_dev(dev);
> -
> - if (register_netdevice(dev) < 0)
> - goto failed_free;
> -
> - /* Can use a lockless transmit, unless we generate output sequences */
> - if (!(nt->parms.o_flags & GRE_SEQ))
> - dev->features |= NETIF_F_LLTX;
> -
> - dev_hold(dev);
> - ipgre_tunnel_link(ign, nt);
> - return nt;
> -
> -failed_free:
> - free_netdev(dev);
> - return NULL;
> -}
> -
> -static void ipgre_tunnel_uninit(struct net_device *dev)
> -{
> - struct net *net = dev_net(dev);
> - struct ipgre_net *ign = net_generic(net, ipgre_net_id);
> -
> - ipgre_tunnel_unlink(ign, netdev_priv(dev));
> - dev_put(dev);
> -}
> -
> -
> -static void ipgre_err(struct sk_buff *skb, u32 info)
> -{
> -
> -/* All the routers (except for Linux) return only
> - 8 bytes of packet payload. It means, that precise relaying of
> - ICMP in the real Internet is absolutely infeasible.
> -
> - Moreover, Cisco "wise men" put GRE key to the third word
> - in GRE header. It makes impossible maintaining even soft state for keyed
> - GRE tunnels with enabled checksum. Tell them "thank you".
> -
> - Well, I wonder, rfc1812 was written by Cisco employee,
> - what the hell these idiots break standards established
> - by themselves???
> - */
> -
> + struct net *net = dev_net(skb->dev);
> + struct ip_tunnel_net *itn;
> const struct iphdr *iph = (const struct iphdr *)skb->data;
> - __be16 *p = (__be16 *)(skb->data+(iph->ihl<<2));
> - int grehlen = (iph->ihl<<2) + 4;
> - const int type = icmp_hdr(skb)->type;
> - const int code = icmp_hdr(skb)->code;
> struct ip_tunnel *t;
> - __be16 flags;
> - __be32 key = 0;
> -
> - flags = p[0];
> - if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) {
> - if (flags&(GRE_VERSION|GRE_ROUTING))
> - return;
> - if (flags&GRE_KEY) {
> - grehlen += 4;
> - if (flags&GRE_CSUM)
> - grehlen += 4;
> - }
> - }
> + int dev_type;
>
> - /* If only 8 bytes returned, keyed message will be dropped here */
> - if (skb_headlen(skb) < grehlen)
> - return;
> -
> - if (flags & GRE_KEY)
> - key = *(((__be32 *)p) + (grehlen / 4) - 1);
> -
> - switch (type) {
> - default:
> - case ICMP_PARAMETERPROB:
> - return;
> -
> - case ICMP_DEST_UNREACH:
> - switch (code) {
> - case ICMP_SR_FAILED:
> - case ICMP_PORT_UNREACH:
> - /* Impossible event. */
> - return;
> - default:
> - /* All others are translated to HOST_UNREACH.
> - rfc2003 contains "deep thoughts" about NET_UNREACH,
> - I believe they are just ether pollution. --ANK
> - */
> - break;
> - }
> - break;
> - case ICMP_TIME_EXCEEDED:
> - if (code != ICMP_EXC_TTL)
> - return;
> - break;
> -
> - case ICMP_REDIRECT:
> - break;
> + if (tpi->proto == htons(ETH_P_TEB)) {
> + dev_type = ARPHRD_ETHER;
> + itn = net_generic(net, ipgre_tap_net_id);
> + } else {
> + dev_type = ARPHRD_IPGRE;
> + itn = net_generic(net, ipgre_net_id);
> }
>
> - t = ipgre_tunnel_lookup(skb->dev, iph->daddr, iph->saddr,
> - flags, key, p[1]);
> -
> + t = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi->flags,
> + iph->daddr, iph->saddr, tpi->key);
> if (t == NULL)
> - return;
> -
> - if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
> - ipv4_update_pmtu(skb, dev_net(skb->dev), info,
> - t->parms.link, 0, IPPROTO_GRE, 0);
> - return;
> - }
> - if (type == ICMP_REDIRECT) {
> - ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, 0,
> - IPPROTO_GRE, 0);
> - return;
> - }
> - if (t->parms.iph.daddr == 0 ||
> - ipv4_is_multicast(t->parms.iph.daddr))
> - return;
> -
> - if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
> - return;
> + return 1;
>
> - if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
> - t->err_count++;
> - else
> - t->err_count = 1;
> - t->err_time = jiffies;
> -}
> -
> -static inline u8
> -ipgre_ecn_encapsulate(u8 tos, const struct iphdr *old_iph, struct sk_buff *skb)
> -{
> - u8 inner = 0;
> - if (skb->protocol == htons(ETH_P_IP))
> - inner = old_iph->tos;
> - else if (skb->protocol == htons(ETH_P_IPV6))
> - inner = ipv6_get_dsfield((const struct ipv6hdr *)old_iph);
> - return INET_ECN_encapsulate(tos, inner);
> + ip_tunnel_err(t, skb, info);
> + return 0;
> }
>
> -static int ipgre_rcv(struct sk_buff *skb)
> +static int ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
> {
> + struct net *net = dev_net(skb->dev);
> + struct ip_tunnel_net *itn;
> const struct iphdr *iph;
> - u8 *h;
> - __be16 flags;
> - __sum16 csum = 0;
> - __be32 key = 0;
> - u32 seqno = 0;
> struct ip_tunnel *tunnel;
> - int offset = 4;
> - __be16 gre_proto;
> - int err;
> -
> - if (!pskb_may_pull(skb, 16))
> - goto drop;
> + int dev_type;
> + int err;
>
> - iph = ip_hdr(skb);
> - h = skb->data;
> - flags = *(__be16 *)h;
> -
> - if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) {
> - /* - Version must be 0.
> - - We do not support routing headers.
> - */
> - if (flags&(GRE_VERSION|GRE_ROUTING))
> - goto drop;
> -
> - if (flags&GRE_CSUM) {
> - switch (skb->ip_summed) {
> - case CHECKSUM_COMPLETE:
> - csum = csum_fold(skb->csum);
> - if (!csum)
> - break;
> - /* fall through */
> - case CHECKSUM_NONE:
> - skb->csum = 0;
> - csum = __skb_checksum_complete(skb);
> - skb->ip_summed = CHECKSUM_COMPLETE;
> - }
> - offset += 4;
> - }
> - if (flags&GRE_KEY) {
> - key = *(__be32 *)(h + offset);
> - offset += 4;
> - }
> - if (flags&GRE_SEQ) {
> - seqno = ntohl(*(__be32 *)(h + offset));
> - offset += 4;
> - }
> + if (!pskb_may_pull(skb, 16)) {
> + kfree_skb(skb);
> + return -1;
> }
>
> - gre_proto = *(__be16 *)(h + 2);
> -
> - tunnel = ipgre_tunnel_lookup(skb->dev,
> - iph->saddr, iph->daddr, flags, key,
> - gre_proto);
> - if (tunnel) {
> - struct pcpu_tstats *tstats;
> -
> - secpath_reset(skb);
> -
> - skb->protocol = gre_proto;
> - /* WCCP version 1 and 2 protocol decoding.
> - * - Change protocol to IP
> - * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header
> - */
> - if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) {
> - skb->protocol = htons(ETH_P_IP);
> - if ((*(h + offset) & 0xF0) != 0x40)
> - offset += 4;
> - }
> -
> - skb->mac_header = skb->network_header;
> - __pskb_pull(skb, offset);
> - skb_postpull_rcsum(skb, skb_transport_header(skb), offset);
> - skb->pkt_type = PACKET_HOST;
> -#ifdef CONFIG_NET_IPGRE_BROADCAST
> - if (ipv4_is_multicast(iph->daddr)) {
> - /* Looped back packet, drop it! */
> - if (rt_is_output_route(skb_rtable(skb)))
> - goto drop;
> - tunnel->dev->stats.multicast++;
> - skb->pkt_type = PACKET_BROADCAST;
> - }
> -#endif
> -
> - if (((flags&GRE_CSUM) && csum) ||
> - (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) {
> - tunnel->dev->stats.rx_crc_errors++;
> - tunnel->dev->stats.rx_errors++;
> - goto drop;
> - }
> - if (tunnel->parms.i_flags&GRE_SEQ) {
> - if (!(flags&GRE_SEQ) ||
> - (tunnel->i_seqno && (s32)(seqno - tunnel->i_seqno) < 0)) {
> - tunnel->dev->stats.rx_fifo_errors++;
> - tunnel->dev->stats.rx_errors++;
> - goto drop;
> - }
> - tunnel->i_seqno = seqno + 1;
> - }
> -
> - /* Warning: All skb pointers will be invalidated! */
> - if (tunnel->dev->type == ARPHRD_ETHER) {
> - if (!pskb_may_pull(skb, ETH_HLEN)) {
> - tunnel->dev->stats.rx_length_errors++;
> - tunnel->dev->stats.rx_errors++;
> - goto drop;
> - }
> -
> - iph = ip_hdr(skb);
> - skb->protocol = eth_type_trans(skb, tunnel->dev);
> - skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
> - }
> -
> - __skb_tunnel_rx(skb, tunnel->dev);
> -
> - skb_reset_network_header(skb);
> - err = IP_ECN_decapsulate(iph, skb);
> - if (unlikely(err)) {
> - if (log_ecn_error)
> - net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
> - &iph->saddr, iph->tos);
> - if (err > 1) {
> - ++tunnel->dev->stats.rx_frame_errors;
> - ++tunnel->dev->stats.rx_errors;
> - goto drop;
> - }
> - }
> -
> - tstats = this_cpu_ptr(tunnel->dev->tstats);
> - u64_stats_update_begin(&tstats->syncp);
> - tstats->rx_packets++;
> - tstats->rx_bytes += skb->len;
> - u64_stats_update_end(&tstats->syncp);
> + iph = ip_hdr(skb);
>
> - gro_cells_receive(&tunnel->gro_cells, skb);
> - return 0;
> + if (tpi->proto == htons(ETH_P_TEB)) {
> + dev_type = ARPHRD_ETHER;
> + itn = net_generic(net, ipgre_tap_net_id);
> + } else {
> + dev_type = ARPHRD_IPGRE;
> + itn = net_generic(net, ipgre_net_id);
dev_type is set, but unused. Same in ipgre_err()
> }
> - icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
>
> -drop:
> - kfree_skb(skb);
> - return 0;
> + tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi->flags,
> + iph->saddr, iph->daddr, tpi->key);
> + if (tunnel)
> + err = ip_tunnel_rcv(tunnel, skb, tpi, log_ecn_error);
> + else
> + err = 1;
> +
> + return err;
> }
>
> static netdev_tx_t ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
> {
> + __be16 proto = skb->dev->type == ARPHRD_ETHER ?
> + htons(ETH_P_TEB) : skb->protocol;
> + struct tnl_ptk_info tpi;
> struct ip_tunnel *tunnel = netdev_priv(dev);
> - const struct iphdr *old_iph = ip_hdr(skb);
> const struct iphdr *tiph;
> - struct flowi4 fl4;
> - u8 tos;
> - __be16 df;
> - struct rtable *rt; /* Route to the other host */
> - struct net_device *tdev; /* Device to other host */
> - struct iphdr *iph; /* Our new IP header */
> - unsigned int max_headroom; /* The extra header space needed */
> + struct iphdr iph; /* Our new IP header */
> int gre_hlen;
> - __be32 dst;
> - int mtu;
> -
> - if (skb->ip_summed == CHECKSUM_PARTIAL &&
> - skb_checksum_help(skb))
> - goto tx_error;
> -
> - if (dev->type == ARPHRD_ETHER)
> - IPCB(skb)->flags = 0;
> + int err, tx_len;
>
> if (dev->header_ops && dev->type == ARPHRD_IPGRE) {
> gre_hlen = 0;
> tiph = (const struct iphdr *)skb->data;
> } else {
> - gre_hlen = tunnel->hlen;
> + gre_hlen = tunnel->hlen + sizeof(struct iphdr);
> tiph = &tunnel->parms.iph;
> }
>
> - if ((dst = tiph->daddr) == 0) {
> - /* NBMA tunnel */
> -
> - if (skb_dst(skb) == NULL) {
> - dev->stats.tx_fifo_errors++;
> - goto tx_error;
> - }
> -
> - if (skb->protocol == htons(ETH_P_IP)) {
> - rt = skb_rtable(skb);
> - dst = rt_nexthop(rt, old_iph->daddr);
> - }
> -#if IS_ENABLED(CONFIG_IPV6)
> - else if (skb->protocol == htons(ETH_P_IPV6)) {
> - const struct in6_addr *addr6;
> - struct neighbour *neigh;
> - bool do_tx_error_icmp;
> - int addr_type;
> -
> - neigh = dst_neigh_lookup(skb_dst(skb), &ipv6_hdr(skb)->daddr);
> - if (neigh == NULL)
> - goto tx_error;
> -
> - addr6 = (const struct in6_addr *)&neigh->primary_key;
> - addr_type = ipv6_addr_type(addr6);
> -
> - if (addr_type == IPV6_ADDR_ANY) {
> - addr6 = &ipv6_hdr(skb)->daddr;
> - addr_type = ipv6_addr_type(addr6);
> - }
> -
> - if ((addr_type & IPV6_ADDR_COMPATv4) == 0)
> - do_tx_error_icmp = true;
> - else {
> - do_tx_error_icmp = false;
> - dst = addr6->s6_addr32[3];
> - }
> - neigh_release(neigh);
> - if (do_tx_error_icmp)
> - goto tx_error_icmp;
> - }
> -#endif
> - else
> - goto tx_error;
> - }
> -
> - tos = tiph->tos;
> - if (tos == 1) {
> - tos = 0;
> - if (skb->protocol == htons(ETH_P_IP))
> - tos = old_iph->tos;
> - else if (skb->protocol == htons(ETH_P_IPV6))
> - tos = ipv6_get_dsfield((const struct ipv6hdr *)old_iph);
> - }
> -
> - rt = ip_route_output_gre(dev_net(dev), &fl4, dst, tiph->saddr,
> - tunnel->parms.o_key, RT_TOS(tos),
> - tunnel->parms.link);
> - if (IS_ERR(rt)) {
> - dev->stats.tx_carrier_errors++;
> - goto tx_error;
> - }
> - tdev = rt->dst.dev;
> -
> - if (tdev == dev) {
> - ip_rt_put(rt);
> - dev->stats.collisions++;
> - goto tx_error;
> - }
> -
> - df = tiph->frag_off;
> - if (df)
> - mtu = dst_mtu(&rt->dst) - dev->hard_header_len - tunnel->hlen;
> - else
> - mtu = skb_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu;
> -
> - if (skb_dst(skb))
> - skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
> -
> - if (skb->protocol == htons(ETH_P_IP)) {
> - df |= (old_iph->frag_off&htons(IP_DF));
> -
> - if ((old_iph->frag_off&htons(IP_DF)) &&
> - mtu < ntohs(old_iph->tot_len)) {
> - icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
> - ip_rt_put(rt);
> - goto tx_error;
> - }
> - }
> -#if IS_ENABLED(CONFIG_IPV6)
> - else if (skb->protocol == htons(ETH_P_IPV6)) {
> - struct rt6_info *rt6 = (struct rt6_info *)skb_dst(skb);
> -
> - if (rt6 && mtu < dst_mtu(skb_dst(skb)) && mtu >= IPV6_MIN_MTU) {
> - if ((tunnel->parms.iph.daddr &&
> - !ipv4_is_multicast(tunnel->parms.iph.daddr)) ||
> - rt6->rt6i_dst.plen == 128) {
> - rt6->rt6i_flags |= RTF_MODIFIED;
> - dst_metric_set(skb_dst(skb), RTAX_MTU, mtu);
> - }
> - }
> -
> - if (mtu >= IPV6_MIN_MTU && mtu < skb->len - tunnel->hlen + gre_hlen) {
> - icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
> - ip_rt_put(rt);
> - goto tx_error;
> - }
> - }
> -#endif
> -
> - if (tunnel->err_count > 0) {
> - if (time_before(jiffies,
> - tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
> - tunnel->err_count--;
> -
> - dst_link_failure(skb);
> - } else
> - tunnel->err_count = 0;
> - }
> -
> - max_headroom = LL_RESERVED_SPACE(tdev) + gre_hlen + rt->dst.header_len;
> -
> - if (skb_headroom(skb) < max_headroom || skb_shared(skb)||
> - (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
> - struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
> - if (max_headroom > dev->needed_headroom)
> - dev->needed_headroom = max_headroom;
> - if (!new_skb) {
> - ip_rt_put(rt);
> - dev->stats.tx_dropped++;
> - dev_kfree_skb(skb);
> - return NETDEV_TX_OK;
> - }
> - if (skb->sk)
> - skb_set_owner_w(new_skb, skb->sk);
> + err = ip_tunnel_build_iphdr(skb, dev, tiph, gre_hlen, &iph);
> + if (err)
> + return NETDEV_TX_OK;
> +
> + tpi.flags = tunnel->parms.o_flags;
> + tpi.proto = proto;
> + tpi.key = tunnel->parms.o_key;
> + tpi.seq = htonl(tunnel->o_seqno);
> + tpi.hdr_len = tunnel->hlen;
> + if (skb_cow_head(skb, dev->needed_headroom)) {
> + dev->stats.tx_dropped++;
> dev_kfree_skb(skb);
> - skb = new_skb;
> - old_iph = ip_hdr(skb);
> - }
> -
> - skb_reset_transport_header(skb);
> - skb_push(skb, gre_hlen);
> - skb_reset_network_header(skb);
> - memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
> - IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED |
> - IPSKB_REROUTED);
> - skb_dst_drop(skb);
> - skb_dst_set(skb, &rt->dst);
> -
> - /*
> - * Push down and install the IPIP header.
> - */
> -
> - iph = ip_hdr(skb);
> - iph->version = 4;
> - iph->ihl = sizeof(struct iphdr) >> 2;
> - iph->frag_off = df;
> - iph->protocol = IPPROTO_GRE;
> - iph->tos = ipgre_ecn_encapsulate(tos, old_iph, skb);
> - iph->daddr = fl4.daddr;
> - iph->saddr = fl4.saddr;
> -
> - if ((iph->ttl = tiph->ttl) == 0) {
> - if (skb->protocol == htons(ETH_P_IP))
> - iph->ttl = old_iph->ttl;
> -#if IS_ENABLED(CONFIG_IPV6)
> - else if (skb->protocol == htons(ETH_P_IPV6))
> - iph->ttl = ((const struct ipv6hdr *)old_iph)->hop_limit;
> -#endif
> - else
> - iph->ttl = ip4_dst_hoplimit(&rt->dst);
> + return NETDEV_TX_OK;
> }
>
> - ((__be16 *)(iph + 1))[0] = tunnel->parms.o_flags;
> - ((__be16 *)(iph + 1))[1] = (dev->type == ARPHRD_ETHER) ?
> - htons(ETH_P_TEB) : skb->protocol;
> + tx_len = ip_tunnel_xmit(skb, &iph, &tpi, gre_build_header);
> + if (tx_len > 0) {
> + struct pcpu_tstats *tstats = this_cpu_ptr(dev->tstats);
>
> - if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) {
> - __be32 *ptr = (__be32 *)(((u8 *)iph) + tunnel->hlen - 4);
> + u64_stats_update_begin(&tstats->syncp);
> + tstats->tx_bytes += tx_len;
> + tstats->tx_packets++;
> + u64_stats_update_end(&tstats->syncp);
>
> - if (tunnel->parms.o_flags&GRE_SEQ) {
> + if (tunnel->parms.o_flags&GRE_SEQ)
> ++tunnel->o_seqno;
> - *ptr = htonl(tunnel->o_seqno);
> - ptr--;
> - }
> - if (tunnel->parms.o_flags&GRE_KEY) {
> - *ptr = tunnel->parms.o_key;
> - ptr--;
> - }
> - if (tunnel->parms.o_flags&GRE_CSUM) {
> - *ptr = 0;
> - *(__sum16 *)ptr = ip_compute_csum((void *)(iph+1), skb->len - sizeof(struct iphdr));
> - }
> + } else {
> + dev->stats.tx_errors++;
> + dev->stats.tx_aborted_errors++;
> }
>
> - iptunnel_xmit(skb, dev);
> - return NETDEV_TX_OK;
> -
> -#if IS_ENABLED(CONFIG_IPV6)
> -tx_error_icmp:
> - dst_link_failure(skb);
> -#endif
> -tx_error:
> - dev->stats.tx_errors++;
> - dev_kfree_skb(skb);
> return NETDEV_TX_OK;
> }
>
> -static int ipgre_tunnel_bind_dev(struct net_device *dev)
> +static int ipgre_get_ioctl_param(struct net_device *dev, struct ifreq *ifr,
> + struct ip_tunnel_parm *p)
> {
> - struct net_device *tdev = NULL;
> - struct ip_tunnel *tunnel;
> - const struct iphdr *iph;
> - int hlen = LL_MAX_HEADER;
> - int mtu = ETH_DATA_LEN;
> - int addend = sizeof(struct iphdr) + 4;
> + BUILD_BUG_ON(TUNNEL_KEY != GRE_KEY);
> + BUILD_BUG_ON(TUNNEL_SEQ != GRE_SEQ);
> + BUILD_BUG_ON(TUNNEL_CSUM != GRE_CSUM);
>
> - tunnel = netdev_priv(dev);
> - iph = &tunnel->parms.iph;
> + if (copy_from_user(p, ifr->ifr_ifru.ifru_data, sizeof(*p)))
> + return -EFAULT;
>
> - /* Guess output device to choose reasonable mtu and needed_headroom */
> -
> - if (iph->daddr) {
> - struct flowi4 fl4;
> - struct rtable *rt;
> -
> - rt = ip_route_output_gre(dev_net(dev), &fl4,
> - iph->daddr, iph->saddr,
> - tunnel->parms.o_key,
> - RT_TOS(iph->tos),
> - tunnel->parms.link);
> - if (!IS_ERR(rt)) {
> - tdev = rt->dst.dev;
> - ip_rt_put(rt);
> - }
> -
> - if (dev->type != ARPHRD_ETHER)
> - dev->flags |= IFF_POINTOPOINT;
> - }
> -
> - if (!tdev && tunnel->parms.link)
> - tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link);
> -
> - if (tdev) {
> - hlen = tdev->hard_header_len + tdev->needed_headroom;
> - mtu = tdev->mtu;
> - }
> - dev->iflink = tunnel->parms.link;
> -
> - /* Precalculate GRE options length */
> - if (tunnel->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) {
> - if (tunnel->parms.o_flags&GRE_CSUM)
> - addend += 4;
> - if (tunnel->parms.o_flags&GRE_KEY)
> - addend += 4;
> - if (tunnel->parms.o_flags&GRE_SEQ)
> - addend += 4;
> - }
> - dev->needed_headroom = addend + hlen;
> - mtu -= dev->hard_header_len + addend;
> -
> - if (mtu < 68)
> - mtu = 68;
> -
> - tunnel->hlen = addend;
> -
> - return mtu;
> -}
> -
> -static int
> -ipgre_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
> -{
> - int err = 0;
> - struct ip_tunnel_parm p;
> - struct ip_tunnel *t;
> - struct net *net = dev_net(dev);
> - struct ipgre_net *ign = net_generic(net, ipgre_net_id);
> -
> - switch (cmd) {
> - case SIOCGETTUNNEL:
> - t = NULL;
> - if (dev == ign->fb_tunnel_dev) {
> - if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
> - err = -EFAULT;
> - break;
> - }
> - t = ipgre_tunnel_locate(net, &p, 0);
> - }
> - if (t == NULL)
> - t = netdev_priv(dev);
> - memcpy(&p, &t->parms, sizeof(p));
> - if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
> - err = -EFAULT;
> - break;
> -
> - case SIOCADDTUNNEL:
> - case SIOCCHGTUNNEL:
> - err = -EPERM;
> - if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
> - goto done;
> -
> - err = -EFAULT;
> - if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
> - goto done;
> -
> - err = -EINVAL;
> - if (p.iph.version != 4 || p.iph.protocol != IPPROTO_GRE ||
> - p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)) ||
> - ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING)))
> - goto done;
> - if (p.iph.ttl)
> - p.iph.frag_off |= htons(IP_DF);
> -
> - if (!(p.i_flags&GRE_KEY))
> - p.i_key = 0;
> - if (!(p.o_flags&GRE_KEY))
> - p.o_key = 0;
> -
> - t = ipgre_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);
> -
> - if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
> - if (t != NULL) {
> - if (t->dev != dev) {
> - err = -EEXIST;
> - break;
> - }
> - } else {
> - unsigned int nflags = 0;
> -
> - t = netdev_priv(dev);
> -
> - if (ipv4_is_multicast(p.iph.daddr))
> - nflags = IFF_BROADCAST;
> - else if (p.iph.daddr)
> - nflags = IFF_POINTOPOINT;
> -
> - if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) {
> - err = -EINVAL;
> - break;
> - }
> - ipgre_tunnel_unlink(ign, t);
> - synchronize_net();
> - t->parms.iph.saddr = p.iph.saddr;
> - t->parms.iph.daddr = p.iph.daddr;
> - t->parms.i_key = p.i_key;
> - t->parms.o_key = p.o_key;
> - memcpy(dev->dev_addr, &p.iph.saddr, 4);
> - memcpy(dev->broadcast, &p.iph.daddr, 4);
> - ipgre_tunnel_link(ign, t);
> - netdev_state_change(dev);
> - }
> - }
> -
> - if (t) {
> - err = 0;
> - if (cmd == SIOCCHGTUNNEL) {
> - t->parms.iph.ttl = p.iph.ttl;
> - t->parms.iph.tos = p.iph.tos;
> - t->parms.iph.frag_off = p.iph.frag_off;
> - if (t->parms.link != p.link) {
> - t->parms.link = p.link;
> - dev->mtu = ipgre_tunnel_bind_dev(dev);
> - netdev_state_change(dev);
> - }
> - }
> - if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
> - err = -EFAULT;
> - } else
> - err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
> - break;
> -
> - case SIOCDELTUNNEL:
> - err = -EPERM;
> - if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
> - goto done;
> -
> - if (dev == ign->fb_tunnel_dev) {
> - err = -EFAULT;
> - if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
> - goto done;
> - err = -ENOENT;
> - if ((t = ipgre_tunnel_locate(net, &p, 0)) == NULL)
> - goto done;
> - err = -EPERM;
> - if (t == netdev_priv(ign->fb_tunnel_dev))
> - goto done;
> - dev = t->dev;
> - }
> - unregister_netdevice(dev);
> - err = 0;
> - break;
> -
> - default:
> - err = -EINVAL;
> - }
> -
> -done:
> - return err;
> -}
> -
> -static int ipgre_tunnel_change_mtu(struct net_device *dev, int new_mtu)
> -{
> - struct ip_tunnel *tunnel = netdev_priv(dev);
> - if (new_mtu < 68 ||
> - new_mtu > 0xFFF8 - dev->hard_header_len - tunnel->hlen)
> + if (p->iph.version != 4 || p->iph.protocol != IPPROTO_GRE ||
> + p->iph.ihl != 5 || (p->iph.frag_off&htons(~IP_DF)) ||
> + ((p->i_flags|p->o_flags)&(GRE_VERSION|GRE_ROUTING))) {
> return -EINVAL;
> - dev->mtu = new_mtu;
> + }
> + if (p->iph.ttl)
> + p->iph.frag_off |= htons(IP_DF);
> + if (!(p->i_flags&GRE_KEY))
> + p->i_key = 0;
> + if (!(p->o_flags&GRE_KEY))
> + p->o_key = 0;
> return 0;
> }
>
> @@ -1285,180 +377,6 @@ static int ipgre_close(struct net_device *dev)
>
> #endif
>
> -static const struct net_device_ops ipgre_netdev_ops = {
> - .ndo_init = ipgre_tunnel_init,
> - .ndo_uninit = ipgre_tunnel_uninit,
> -#ifdef CONFIG_NET_IPGRE_BROADCAST
> - .ndo_open = ipgre_open,
> - .ndo_stop = ipgre_close,
> -#endif
> - .ndo_start_xmit = ipgre_tunnel_xmit,
> - .ndo_do_ioctl = ipgre_tunnel_ioctl,
> - .ndo_change_mtu = ipgre_tunnel_change_mtu,
> - .ndo_get_stats64 = ipgre_get_stats64,
> -};
> -
> -static void ipgre_dev_free(struct net_device *dev)
> -{
> - struct ip_tunnel *tunnel = netdev_priv(dev);
> -
> - gro_cells_destroy(&tunnel->gro_cells);
> - free_percpu(dev->tstats);
> - free_netdev(dev);
> -}
> -
> -#define GRE_FEATURES (NETIF_F_SG | \
> - NETIF_F_FRAGLIST | \
> - NETIF_F_HIGHDMA | \
> - NETIF_F_HW_CSUM)
> -
> -static void ipgre_tunnel_setup(struct net_device *dev)
> -{
> - dev->netdev_ops = &ipgre_netdev_ops;
> - dev->destructor = ipgre_dev_free;
> -
> - dev->type = ARPHRD_IPGRE;
> - dev->needed_headroom = LL_MAX_HEADER + sizeof(struct iphdr) + 4;
> - dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 4;
> - dev->flags = IFF_NOARP;
> - dev->iflink = 0;
> - dev->addr_len = 4;
> - dev->features |= NETIF_F_NETNS_LOCAL;
> - dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
> -
> - dev->features |= GRE_FEATURES;
> - dev->hw_features |= GRE_FEATURES;
> -}
> -
> -static int ipgre_tunnel_init(struct net_device *dev)
> -{
> - struct ip_tunnel *tunnel;
> - struct iphdr *iph;
> - int err;
> -
> - tunnel = netdev_priv(dev);
> - iph = &tunnel->parms.iph;
> -
> - tunnel->dev = dev;
> - strcpy(tunnel->parms.name, dev->name);
> -
> - memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
> - memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
> -
> - if (iph->daddr) {
> -#ifdef CONFIG_NET_IPGRE_BROADCAST
> - if (ipv4_is_multicast(iph->daddr)) {
> - if (!iph->saddr)
> - return -EINVAL;
> - dev->flags = IFF_BROADCAST;
> - dev->header_ops = &ipgre_header_ops;
> - }
> -#endif
> - } else
> - dev->header_ops = &ipgre_header_ops;
> -
> - dev->tstats = alloc_percpu(struct pcpu_tstats);
> - if (!dev->tstats)
> - return -ENOMEM;
> -
> - err = gro_cells_init(&tunnel->gro_cells, dev);
> - if (err) {
> - free_percpu(dev->tstats);
> - return err;
> - }
> -
> - return 0;
> -}
> -
> -static void ipgre_fb_tunnel_init(struct net_device *dev)
> -{
> - struct ip_tunnel *tunnel = netdev_priv(dev);
> - struct iphdr *iph = &tunnel->parms.iph;
> -
> - tunnel->dev = dev;
> - strcpy(tunnel->parms.name, dev->name);
> -
> - iph->version = 4;
> - iph->protocol = IPPROTO_GRE;
> - iph->ihl = 5;
> - tunnel->hlen = sizeof(struct iphdr) + 4;
> -
> - dev_hold(dev);
> -}
> -
> -
> -static const struct gre_protocol ipgre_protocol = {
> - .handler = ipgre_rcv,
> - .err_handler = ipgre_err,
> -};
> -
> -static void ipgre_destroy_tunnels(struct ipgre_net *ign, struct list_head *head)
> -{
> - int prio;
> -
> - for (prio = 0; prio < 4; prio++) {
> - int h;
> - for (h = 0; h < HASH_SIZE; h++) {
> - struct ip_tunnel *t;
> -
> - t = rtnl_dereference(ign->tunnels[prio][h]);
> -
> - while (t != NULL) {
> - unregister_netdevice_queue(t->dev, head);
> - t = rtnl_dereference(t->next);
> - }
> - }
> - }
> -}
> -
> -static int __net_init ipgre_init_net(struct net *net)
> -{
> - struct ipgre_net *ign = net_generic(net, ipgre_net_id);
> - int err;
> -
> - ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "gre0",
> - ipgre_tunnel_setup);
> - if (!ign->fb_tunnel_dev) {
> - err = -ENOMEM;
> - goto err_alloc_dev;
> - }
> - dev_net_set(ign->fb_tunnel_dev, net);
> -
> - ipgre_fb_tunnel_init(ign->fb_tunnel_dev);
> - ign->fb_tunnel_dev->rtnl_link_ops = &ipgre_link_ops;
> -
> - if ((err = register_netdev(ign->fb_tunnel_dev)))
> - goto err_reg_dev;
> -
> - rcu_assign_pointer(ign->tunnels_wc[0],
> - netdev_priv(ign->fb_tunnel_dev));
> - return 0;
> -
> -err_reg_dev:
> - ipgre_dev_free(ign->fb_tunnel_dev);
> -err_alloc_dev:
> - return err;
> -}
> -
> -static void __net_exit ipgre_exit_net(struct net *net)
> -{
> - struct ipgre_net *ign;
> - LIST_HEAD(list);
> -
> - ign = net_generic(net, ipgre_net_id);
> - rtnl_lock();
> - ipgre_destroy_tunnels(ign, &list);
> - unregister_netdevice_many(&list);
> - rtnl_unlock();
> -}
> -
> -static struct pernet_operations ipgre_net_ops = {
> - .init = ipgre_init_net,
> - .exit = ipgre_exit_net,
> - .id = &ipgre_net_id,
> - .size = sizeof(struct ipgre_net),
> -};
> -
> static int ipgre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
> {
> __be16 flags;
> @@ -1501,15 +419,15 @@ out:
> return ipgre_tunnel_validate(tb, data);
> }
>
> -static void ipgre_netlink_parms(struct nlattr *data[],
> - struct ip_tunnel_parm *parms)
> +static int ipgre_netlink_parms(struct ip_tunnel *itn, struct nlattr *data[],
> + struct nlattr *tb[], struct ip_tunnel_parm *parms)
> {
> memset(parms, 0, sizeof(*parms));
>
> parms->iph.protocol = IPPROTO_GRE;
>
> if (!data)
> - return;
> + return 0;
>
> if (data[IFLA_GRE_LINK])
> parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
> @@ -1540,148 +458,10 @@ static void ipgre_netlink_parms(struct nlattr *data[],
>
> if (!data[IFLA_GRE_PMTUDISC] || nla_get_u8(data[IFLA_GRE_PMTUDISC]))
> parms->iph.frag_off = htons(IP_DF);
> -}
> -
> -static int ipgre_tap_init(struct net_device *dev)
> -{
> - struct ip_tunnel *tunnel;
> -
> - tunnel = netdev_priv(dev);
> -
> - tunnel->dev = dev;
> - strcpy(tunnel->parms.name, dev->name);
> -
> - ipgre_tunnel_bind_dev(dev);
> -
> - dev->tstats = alloc_percpu(struct pcpu_tstats);
> - if (!dev->tstats)
> - return -ENOMEM;
>
> return 0;
> }
>
> -static const struct net_device_ops ipgre_tap_netdev_ops = {
> - .ndo_init = ipgre_tap_init,
> - .ndo_uninit = ipgre_tunnel_uninit,
> - .ndo_start_xmit = ipgre_tunnel_xmit,
> - .ndo_set_mac_address = eth_mac_addr,
> - .ndo_validate_addr = eth_validate_addr,
> - .ndo_change_mtu = ipgre_tunnel_change_mtu,
> - .ndo_get_stats64 = ipgre_get_stats64,
> -};
> -
> -static void ipgre_tap_setup(struct net_device *dev)
> -{
> -
> - ether_setup(dev);
> -
> - dev->netdev_ops = &ipgre_tap_netdev_ops;
> - dev->destructor = ipgre_dev_free;
> -
> - dev->iflink = 0;
> - dev->features |= NETIF_F_NETNS_LOCAL;
> -}
> -
> -static int ipgre_newlink(struct net *src_net, struct net_device *dev, struct nlattr *tb[],
> - struct nlattr *data[])
> -{
> - struct ip_tunnel *nt;
> - struct net *net = dev_net(dev);
> - struct ipgre_net *ign = net_generic(net, ipgre_net_id);
> - int mtu;
> - int err;
> -
> - nt = netdev_priv(dev);
> - ipgre_netlink_parms(data, &nt->parms);
> -
> - if (ipgre_tunnel_find(net, &nt->parms, dev->type))
> - return -EEXIST;
> -
> - if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
> - eth_hw_addr_random(dev);
> -
> - mtu = ipgre_tunnel_bind_dev(dev);
> - if (!tb[IFLA_MTU])
> - dev->mtu = mtu;
> -
> - /* Can use a lockless transmit, unless we generate output sequences */
> - if (!(nt->parms.o_flags & GRE_SEQ))
> - dev->features |= NETIF_F_LLTX;
> -
> - err = register_netdevice(dev);
> - if (err)
> - goto out;
> -
> - dev_hold(dev);
> - ipgre_tunnel_link(ign, nt);
> -
> -out:
> - return err;
> -}
> -
> -static int ipgre_changelink(struct net_device *dev, struct nlattr *tb[],
> - struct nlattr *data[])
> -{
> - struct ip_tunnel *t, *nt;
> - struct net *net = dev_net(dev);
> - struct ipgre_net *ign = net_generic(net, ipgre_net_id);
> - struct ip_tunnel_parm p;
> - int mtu;
> -
> - if (dev == ign->fb_tunnel_dev)
> - return -EINVAL;
> -
> - nt = netdev_priv(dev);
> - ipgre_netlink_parms(data, &p);
> -
> - t = ipgre_tunnel_locate(net, &p, 0);
> -
> - if (t) {
> - if (t->dev != dev)
> - return -EEXIST;
> - } else {
> - t = nt;
> -
> - if (dev->type != ARPHRD_ETHER) {
> - unsigned int nflags = 0;
> -
> - if (ipv4_is_multicast(p.iph.daddr))
> - nflags = IFF_BROADCAST;
> - else if (p.iph.daddr)
> - nflags = IFF_POINTOPOINT;
> -
> - if ((dev->flags ^ nflags) &
> - (IFF_POINTOPOINT | IFF_BROADCAST))
> - return -EINVAL;
> - }
> -
> - ipgre_tunnel_unlink(ign, t);
> - t->parms.iph.saddr = p.iph.saddr;
> - t->parms.iph.daddr = p.iph.daddr;
> - t->parms.i_key = p.i_key;
> - if (dev->type != ARPHRD_ETHER) {
> - memcpy(dev->dev_addr, &p.iph.saddr, 4);
> - memcpy(dev->broadcast, &p.iph.daddr, 4);
> - }
> - ipgre_tunnel_link(ign, t);
> - netdev_state_change(dev);
> - }
> -
> - t->parms.o_key = p.o_key;
> - t->parms.iph.ttl = p.iph.ttl;
> - t->parms.iph.tos = p.iph.tos;
> - t->parms.iph.frag_off = p.iph.frag_off;
> -
> - if (t->parms.link != p.link) {
> - t->parms.link = p.link;
> - mtu = ipgre_tunnel_bind_dev(dev);
> - if (!tb[IFLA_MTU])
> - dev->mtu = mtu;
> - netdev_state_change(dev);
> - }
> -
> - return 0;
> -}
>
> static size_t ipgre_get_size(const struct net_device *dev)
> {
> @@ -1745,6 +525,94 @@ static const struct nla_policy ipgre_policy[IFLA_GRE_MAX + 1] = {
> [IFLA_GRE_PMTUDISC] = { .type = NLA_U8 },
> };
>
> +static int ip_gre_calc_hlen(struct ip_tunnel *tunnel)
> +{
> + int addend = 4;
> +
> + /* Precalculate GRE options length */
> + if (tunnel->parms.o_flags&GRE_CSUM)
> + addend += 4;
> + if (tunnel->parms.o_flags&GRE_KEY)
> + addend += 4;
> + if (tunnel->parms.o_flags&GRE_SEQ)
> + addend += 4;
> + return addend;
> +}
> +
> +#define GRE_FEATURES (NETIF_F_SG | \
> + NETIF_F_FRAGLIST | \
> + NETIF_F_HIGHDMA | \
> + NETIF_F_HW_CSUM)
> +
> +static void __gre_tunnel_init(struct net_device *dev)
> +{
> + struct ip_tunnel *tunnel;
> +
> + tunnel = netdev_priv(dev);
> + tunnel->hlen = ip_gre_calc_hlen(tunnel);
> + tunnel->parms.iph.protocol = IPPROTO_GRE;
> +
> + dev->needed_headroom = LL_MAX_HEADER + sizeof(struct iphdr) + 4;
> + dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 4;
> + dev->iflink = 0;
> +
> + dev->features |= NETIF_F_NETNS_LOCAL | GRE_FEATURES;
> + dev->hw_features |= GRE_FEATURES;
> +}
> +
> +static int ipgre_tunnel_init(struct net_device *dev)
> +{
> + struct ip_tunnel *tunnel = netdev_priv(dev);
> + struct iphdr *iph;
> +
> + __gre_tunnel_init(dev);
> +
> + memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
> + memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
> +
> + dev->type = ARPHRD_IPGRE;
> + dev->flags = IFF_NOARP;
> + dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
> + dev->addr_len = 4;
> +
> + iph = &tunnel->parms.iph;
> + if (iph->daddr) {
> +#ifdef CONFIG_NET_IPGRE_BROADCAST
> + if (ipv4_is_multicast(iph->daddr)) {
> + if (!iph->saddr)
> + return -EINVAL;
> + dev->flags = IFF_BROADCAST;
> + dev->header_ops = &ipgre_header_ops;
> + }
> +#endif
> + } else
> + dev->header_ops = &ipgre_header_ops;
> +
> +
> + return ip_tunnel_init(dev);
> +}
> +
> +static int ipgre_tap_init(struct net_device *dev)
> +{
> + __gre_tunnel_init(dev);
> + return ip_tunnel_init(dev);
> +}
> +
> +static const struct net_device_ops ipgre_tap_netdev_ops;
> +static inline void ipgre_tap_tunnel_setup(struct net_device *dev)
> +{
> + ether_setup(dev);
> + dev->netdev_ops = &ipgre_tap_netdev_ops;
> + ip_tunnel_setup(dev, ipgre_tap_net_id);
> +}
> +
> +static const struct net_device_ops ipgre_netdev_ops;
> +static inline void ipgre_tunnel_setup(struct net_device *dev)
> +{
> + dev->netdev_ops = &ipgre_netdev_ops;
> + ip_tunnel_setup(dev, ipgre_net_id);
> +}
> +
> static struct rtnl_link_ops ipgre_link_ops __read_mostly = {
> .kind = "gre",
> .maxtype = IFLA_GRE_MAX,
> @@ -1752,8 +620,9 @@ static struct rtnl_link_ops ipgre_link_ops __read_mostly = {
> .priv_size = sizeof(struct ip_tunnel),
> .setup = ipgre_tunnel_setup,
> .validate = ipgre_tunnel_validate,
> - .newlink = ipgre_newlink,
> - .changelink = ipgre_changelink,
> + .newlink = ip_tunnel_newlink,
> + .changelink = ip_tunnel_changelink,
> + .dellink = ip_tunnel_dellink,
> .get_size = ipgre_get_size,
> .fill_info = ipgre_fill_info,
> };
> @@ -1763,17 +632,97 @@ static struct rtnl_link_ops ipgre_tap_ops __read_mostly = {
> .maxtype = IFLA_GRE_MAX,
> .policy = ipgre_policy,
> .priv_size = sizeof(struct ip_tunnel),
> - .setup = ipgre_tap_setup,
> + .setup = ipgre_tap_tunnel_setup,
> .validate = ipgre_tap_validate,
> - .newlink = ipgre_newlink,
> - .changelink = ipgre_changelink,
> + .newlink = ip_tunnel_newlink,
> + .changelink = ip_tunnel_changelink,
> + .dellink = ip_tunnel_dellink,
> .get_size = ipgre_get_size,
> .fill_info = ipgre_fill_info,
> };
>
> -/*
> - * And now the modules code and kernel interface.
> - */
> +static const struct net_device_ops ipgre_netdev_ops = {
> + .ndo_init = ipgre_tunnel_init,
> + .ndo_uninit = ip_tunnel_uninit,
> + .ndo_start_xmit = ipgre_tunnel_xmit,
> +#ifdef CONFIG_NET_IPGRE_BROADCAST
> + .ndo_open = ipgre_open,
> + .ndo_stop = ipgre_close,
> +#endif
> + .ndo_do_ioctl = ip_tunnel_ioctl,
> + .ndo_change_mtu = ip_tunnel_change_mtu,
> + .ndo_get_stats64 = ip_tunnel_get_stats64,
> +};
> +
> +static const struct net_device_ops ipgre_tap_netdev_ops = {
> + .ndo_init = ipgre_tap_init,
> + .ndo_uninit = ip_tunnel_uninit,
> + .ndo_start_xmit = ipgre_tunnel_xmit,
> + .ndo_set_mac_address = eth_mac_addr,
> + .ndo_validate_addr = eth_validate_addr,
> + .ndo_change_mtu = ip_tunnel_change_mtu,
> + .ndo_get_stats64 = ip_tunnel_get_stats64,
> +};
> +
> +static const struct ip_tunnel_ops ipgre_tunnel_ops = {
> + .parse_netlink_parms = ipgre_netlink_parms,
> + .get_ioctl_param = ipgre_get_ioctl_param,
> +};
> +
> +static int __net_init ipgre_init_net(struct net *net)
> +{
> + struct ip_tunnel_net *itn = net_generic(net, ipgre_net_id);
> +
> + itn->ops = &ipgre_tunnel_ops;
> + return ip_tunnel_init_net(net, ipgre_net_id, &ipgre_link_ops);
> +}
> +
> +static void __net_exit ipgre_exit_net(struct net *net)
> +{
> + struct ip_tunnel_net *itn = net_generic(net, ipgre_net_id);
> + ip_tunnel_delete_net(itn);
> +}
> +
> +static struct pernet_operations ipgre_net_ops = {
> + .init = ipgre_init_net,
> + .exit = ipgre_exit_net,
> + .id = &ipgre_net_id,
> + .size = sizeof(struct ip_tunnel_net),
> +};
> +
> +static const struct ip_tunnel_ops ipgre_tap_tunnel_ops = {
> + .parse_netlink_parms = ipgre_netlink_parms,
> + .get_ioctl_param = ipgre_get_ioctl_param,
> +};
> +
> +static int __net_init ipgre_tap_init_net(struct net *net)
> +{
> + struct ip_tunnel_net *itn = net_generic(net, ipgre_tap_net_id);
> +
> + itn->ops = &ipgre_tap_tunnel_ops;
> + return ip_tunnel_init_net(net, ipgre_tap_net_id, &ipgre_tap_ops);
> +}
> +
> +static void __net_exit ipgre_tap_exit_net(struct net *net)
> +{
> + struct ip_tunnel_net *itn = net_generic(net, ipgre_tap_net_id);
> + ip_tunnel_delete_net(itn);
> +}
> +
> +static struct pernet_operations ipgre_tap_net_ops = {
> + .init = ipgre_tap_init_net,
> + .exit = ipgre_tap_exit_net,
> + .id = &ipgre_tap_net_id,
> + .size = sizeof(struct ip_tunnel_net),
> +};
> +
> +static struct ipt_protocol ipgre_protocol = {
> + .handler = ipgre_rcv,
> + .err_handler = ipgre_err,
> + .portno = 0,
> + .priority = 0,
> + .type = IPT_GRE,
> +};
>
> static int __init ipgre_init(void)
> {
> @@ -1785,8 +734,12 @@ static int __init ipgre_init(void)
> if (err < 0)
> return err;
>
> + err = register_pernet_device(&ipgre_tap_net_ops);
> + if (err < 0)
> + goto pnet_tap_faied;
> +
> rtnl_lock();
> - err = gre_add_protocol(&ipgre_protocol, GREPROTO_CISCO);
> + err = ipt_add_protocol(&ipgre_protocol);
> if (err < 0) {
> rtnl_unlock();
> pr_info("%s: can't add protocol\n", __func__);
> @@ -1802,16 +755,17 @@ static int __init ipgre_init(void)
> if (err < 0)
> goto tap_ops_failed;
>
> -out:
> - return err;
> + return 0;
>
> tap_ops_failed:
> rtnl_link_unregister(&ipgre_link_ops);
> rtnl_link_failed:
> - gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO);
> + ipt_del_protocol(&ipgre_protocol);
> add_proto_failed:
> + unregister_pernet_device(&ipgre_tap_net_ops);
> +pnet_tap_faied:
> unregister_pernet_device(&ipgre_net_ops);
> - goto out;
> + return err;
> }
>
> static void __exit ipgre_fini(void)
> @@ -1819,9 +773,9 @@ static void __exit ipgre_fini(void)
> rtnl_link_unregister(&ipgre_tap_ops);
> rtnl_link_unregister(&ipgre_link_ops);
> rtnl_lock();
> - if (gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO) < 0)
> - pr_info("%s: can't remove protocol\n", __func__);
> + ipt_del_protocol(&ipgre_protocol);
> rtnl_unlock();
> + unregister_pernet_device(&ipgre_tap_net_ops);
> unregister_pernet_device(&ipgre_net_ops);
> }
>
> diff --git a/net/ipv4/ip_tunnel.c b/net/ipv4/ip_tunnel.c
> new file mode 100644
> index 0000000..e5e2fde
> --- /dev/null
> +++ b/net/ipv4/ip_tunnel.c
> @@ -0,0 +1,1283 @@
> +/*
> + *
> + * 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/capability.h>
> +#include <linux/module.h>
> +#include <linux/types.h>
> +#include <linux/kernel.h>
> +#include <linux/slab.h>
> +#include <linux/uaccess.h>
> +#include <linux/skbuff.h>
> +#include <linux/netdevice.h>
> +#include <linux/in.h>
> +#include <linux/tcp.h>
> +#include <linux/udp.h>
> +#include <linux/if_arp.h>
> +#include <linux/mroute.h>
> +#include <linux/init.h>
> +#include <linux/in6.h>
> +#include <linux/inetdevice.h>
> +#include <linux/igmp.h>
> +#include <linux/netfilter_ipv4.h>
> +#include <linux/etherdevice.h>
> +#include <linux/if_ether.h>
> +#include <linux/if_vlan.h>
> +
> +#include <net/sock.h>
> +#include <net/ip.h>
> +#include <net/icmp.h>
> +#include <net/protocol.h>
> +#include <net/ipip.h>
> +#include <net/arp.h>
> +#include <net/checksum.h>
> +#include <net/dsfield.h>
> +#include <net/inet_ecn.h>
> +#include <net/xfrm.h>
> +#include <net/net_namespace.h>
> +#include <net/netns/generic.h>
> +#include <net/rtnetlink.h>
> +
> +#if IS_ENABLED(CONFIG_IPV6)
> +#include <net/ipv6.h>
> +#include <net/ip6_fib.h>
> +#include <net/ip6_route.h>
> +#endif
> +
> +#define HASH(addr) ((__force u32)addr^((__force u32)addr>>4))
> +static int ip_tunnel_salt;
> +
> +static unsigned int ip_tunnel_hash(struct ip_tunnel_net *itn,
> + __be32 key, __be32 remote)
> +{
> + unsigned int h = HASH(key);
> +
> + if (!(itn->ops->flags & HASH_ON_KEY))
> + h ^= HASH(remote);
> +
> + return jhash_1word(h, ip_tunnel_salt) & (IPT_HASH_SIZE-1);
> +}
> +
> +/* often modified stats are per cpu, other are shared (netdev->stats) */
> +struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev,
> + struct rtnl_link_stats64 *tot)
> +{
> + int i;
> +
> + for_each_possible_cpu(i) {
> + const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i);
> + u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
> + unsigned int start;
> +
> + do {
> + start = u64_stats_fetch_begin_bh(&tstats->syncp);
> + rx_packets = tstats->rx_packets;
> + tx_packets = tstats->tx_packets;
> + rx_bytes = tstats->rx_bytes;
> + tx_bytes = tstats->tx_bytes;
> + } while (u64_stats_fetch_retry_bh(&tstats->syncp, start));
> +
> + tot->rx_packets += rx_packets;
> + tot->tx_packets += tx_packets;
> + tot->rx_bytes += rx_bytes;
> + tot->tx_bytes += tx_bytes;
> + }
> +
> + tot->multicast = dev->stats.multicast;
> +
> + tot->rx_crc_errors = dev->stats.rx_crc_errors;
> + tot->rx_fifo_errors = dev->stats.rx_fifo_errors;
> + tot->rx_length_errors = dev->stats.rx_length_errors;
> + tot->rx_frame_errors = dev->stats.rx_frame_errors;
> + tot->rx_errors = dev->stats.rx_errors;
> +
> + tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
> + tot->tx_carrier_errors = dev->stats.tx_carrier_errors;
> + tot->tx_dropped = dev->stats.tx_dropped;
> + tot->tx_aborted_errors = dev->stats.tx_aborted_errors;
> + tot->tx_errors = dev->stats.tx_errors;
> +
> + tot->collisions = dev->stats.collisions;
> +
> + return tot;
> +}
> +EXPORT_SYMBOL(ip_tunnel_get_stats64);
> +
> +static bool ip_tunnel_key_match(const struct ip_tunnel_parm *p,
> + __be16 flags, __be32 key)
> +{
> + if (p->i_flags & TUNNEL_KEY) {
> + if (flags & TUNNEL_KEY)
> + return key == p->i_key;
> + else
> + /* key expected, none present */
> + return false;
> + } else
> + return !(flags & TUNNEL_KEY);
> +}
> +
> +static struct ip_tunnel *__tunnel_lookup(struct ip_tunnel_net *itn,
> + int link, __be16 flags,
> + __be32 remote, __be32 local,
> + __be32 key, int hash,
> + struct ip_tunnel **cand)
> +{
> + struct ip_tunnel *t;
> +
> + for_each_ip_tunnel_rcu(t, itn->tunnels[hash]) {
> + if (local != t->parms.iph.saddr ||
> + remote != t->parms.iph.daddr ||
> + !(t->dev->flags & IFF_UP))
> + continue;
> +
> + if (!remote &&
> + !(ipv4_is_multicast(local) && local == t->parms.iph.daddr))
> + continue;
> +
> + if (!ip_tunnel_key_match(&t->parms, flags, key))
> + continue;
> +
> + if (t->parms.link == link)
> + return t;
> + else
> + *cand = t;
> + }
> + return NULL;
> +}
> +
> +/* Fallback tunnel: no source, no destination, no key, no options */
> +
> +
> +/* Tunnel hash table:
> + We require exact key match i.e. if a key is present in packet
> + it will match only tunnel with the same key; if it is not present,
> + it will match only keyless tunnel.
> +
> + All keysless packets, if not matched configured keyless tunnels
> + will match fallback tunnel.
> + */
> +
> +/* Given src, dst and key, find appropriate for input tunnel. */
> +struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn,
> + int link, __be16 flags,
> + __be32 remote, __be32 local,
> + __be32 key)
> +{
> + unsigned int h;
> + struct ip_tunnel *t, *cand = NULL;
> +
> + h = ip_tunnel_hash(itn, key, remote);
> +
> + t = __tunnel_lookup(itn, link, flags, remote, local, key, h, &cand);
> + if (t)
> + return t;
> +
> + t = __tunnel_lookup(itn, link, flags, remote, 0, key, h, &cand);
> + if (t)
> + return t;
> +
> + t = __tunnel_lookup(itn, link, flags, 0, local, key, h, &cand);
> + if (t)
> + return t;
> +
> + t = __tunnel_lookup(itn, link, flags, 0, 0, key, h, &cand);
> + if (t)
> + return t;
> +
> + if (cand != NULL)
> + return cand;
> +
> + if (itn->fb_tunnel_dev && itn->fb_tunnel_dev->flags & IFF_UP)
> + return netdev_priv(itn->fb_tunnel_dev);
> +
> + return NULL;
> +}
> +EXPORT_SYMBOL(ip_tunnel_lookup);
> +
> +struct ip_tunnel *ip_tunnel_lookup_key(struct ip_tunnel_net *itn, __be32 key)
> +{
> + struct ip_tunnel *t;
> + unsigned int h = HASH(key);
> +
> + h = jhash_1word(h, ip_tunnel_salt) & (IPT_HASH_SIZE-1);
> + for_each_ip_tunnel_rcu(t, itn->tunnels[h]) {
> + if (key == t->parms.i_key)
> + return t;
> + }
> +
> + return NULL;
> +}
> +EXPORT_SYMBOL(ip_tunnel_lookup_key);
> +
> +static struct ip_tunnel __rcu **ip_bucket(struct ip_tunnel_net *itn,
> + struct ip_tunnel_parm *parms)
> +{
> + unsigned int h = ip_tunnel_hash(itn, parms->i_key, parms->iph.daddr);
> +
> + return &itn->tunnels[h];
> +}
> +
> +void ip_tunnel_link(struct ip_tunnel_net *itn, struct ip_tunnel *t)
> +{
> + struct ip_tunnel __rcu **tp = ip_bucket(itn, &t->parms);
> +
> + rcu_assign_pointer(t->next, rtnl_dereference(*tp));
> + rcu_assign_pointer(*tp, t);
> +}
> +EXPORT_SYMBOL(ip_tunnel_link);
> +
> +void ip_tunnel_unlink(struct ip_tunnel_net *itn, struct ip_tunnel *t)
> +{
> + struct ip_tunnel __rcu **tp;
> + struct ip_tunnel *iter;
> +
> + for (tp = ip_bucket(itn, &t->parms);
> + (iter = rtnl_dereference(*tp)) != NULL;
> + tp = &iter->next) {
> + if (t == iter) {
> + rcu_assign_pointer(*tp, t->next);
> + break;
> + }
> + }
> +}
> +EXPORT_SYMBOL(ip_tunnel_unlink);
> +
> +struct ip_tunnel *ip_tunnel_find(struct ip_tunnel_net *itn,
> + struct ip_tunnel_parm *parms,
> + int type)
> +{
> + __be32 remote = parms->iph.daddr;
> + __be32 local = parms->iph.saddr;
> + __be32 key = parms->i_key;
> + int link = parms->link;
> + struct ip_tunnel *t;
> + struct ip_tunnel __rcu **tp;
> +
> + for (tp = ip_bucket(itn, parms);
> + (t = rtnl_dereference(*tp)) != NULL;
> + tp = &t->next)
> + if (local == t->parms.iph.saddr &&
> + remote == t->parms.iph.daddr &&
> + key == t->parms.i_key &&
> + link == t->parms.link &&
> + type == t->dev->type)
> + break;
> +
> + return t;
> +}
> +EXPORT_SYMBOL(ip_tunnel_find);
> +
> +static struct net_device *__ip_tunnel_create(struct net *net,
> + const struct rtnl_link_ops *ops,
> + struct ip_tunnel_parm *parms)
> +{
> + int err;
> + struct ip_tunnel *tunnel;
> + struct net_device *dev;
> + char name[IFNAMSIZ];
> +
> + if (parms->name[0])
> + strlcpy(name, parms->name, IFNAMSIZ);
> + else {
> + strlcpy(name, ops->kind, IFNAMSIZ);
> + strncat(name, "%d", IFNAMSIZ);
> + }
> +
> + ASSERT_RTNL();
> + dev = alloc_netdev(ops->priv_size, name, ops->setup);
> + if (!dev) {
> + err = -ENOMEM;
> + goto failed;
> + }
> + dev_net_set(dev, net);
> +
> + dev->rtnl_link_ops = ops;
> +
> + tunnel = netdev_priv(dev);
> + tunnel->parms = *parms;
> +
> + err = register_netdevice(dev);
> + if (err)
> + goto failed_free;
> +
> + return dev;
> +
> +failed_free:
> + free_netdev(dev);
> +failed:
> + return ERR_PTR(err);
> +}
> +
> +static struct ip_tunnel *ip_tunnel_create(struct net *net,
> + struct ip_tunnel_net *itn,
> + struct ip_tunnel_parm *parms)
> +{
> + struct ip_tunnel *nt, *fbt;
> + struct net_device *dev;
> +
> + BUG_ON(!itn->fb_tunnel_dev);
> + fbt = netdev_priv(itn->fb_tunnel_dev);
> + dev = __ip_tunnel_create(net, itn->fb_tunnel_dev->rtnl_link_ops, parms);
> + if (IS_ERR(dev))
> + return NULL;
> +
> + dev->mtu = ip_tunnel_bind_dev(dev);
> +
> + nt = netdev_priv(dev);
> + ip_tunnel_link(itn, nt);
> + return nt;
> +}
> +
> +void ip_tunnel_err(struct ip_tunnel *t, struct sk_buff *skb, u32 info)
> +{
> + const int code = icmp_hdr(skb)->code;
> + const int type = icmp_hdr(skb)->type;
> +
> + if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
> + ipv4_update_pmtu(skb, dev_net(skb->dev), info,
> + t->parms.link, 0, t->parms.iph.protocol, 0);
> + return;
> + }
> + if (type == ICMP_REDIRECT) {
> + ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, 0,
> + t->parms.iph.protocol, 0);
> + return;
> + }
> + if (t->parms.iph.daddr == 0 ||
> + ipv4_is_multicast(t->parms.iph.daddr))
> + return;
> +
> + if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
> + return;
> +
> + if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
> + t->err_count++;
> + else
> + t->err_count = 1;
> + t->err_time = jiffies;
> +}
> +EXPORT_SYMBOL(ip_tunnel_err);
> +
> +int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb,
> + const struct tnl_ptk_info *tpi, bool log_ecn_error)
> +{
> + int err;
> +
> + struct pcpu_tstats *tstats;
> + const struct iphdr *iph = ip_hdr(skb);
> +
> + secpath_reset(skb);
> +
> + skb->protocol = tpi->proto;
> +
> + skb->mac_header = skb->network_header;
> + skb->pkt_type = PACKET_HOST;
> +
> + __pskb_pull(skb, tpi->hdr_len);
> + skb_postpull_rcsum(skb, skb_transport_header(skb), tpi->hdr_len);
> +#ifdef CONFIG_NET_IPGRE_BROADCAST
> + if (ipv4_is_multicast(iph->daddr)) {
> + /* Looped back packet, drop it! */
> + if (rt_is_output_route(skb_rtable(skb)))
> + goto drop;
> + tunnel->dev->stats.multicast++;
> + skb->pkt_type = PACKET_BROADCAST;
> + }
> +#endif
> +
> + if ((!(tpi->flags&TUNNEL_CSUM) && tunnel->parms.i_flags&TUNNEL_CSUM)) {
> + tunnel->dev->stats.rx_crc_errors++;
> + tunnel->dev->stats.rx_errors++;
> + goto drop;
> + }
> +
> + if (tunnel->parms.i_flags&TUNNEL_SEQ) {
> + if (!(tpi->flags&TUNNEL_SEQ) ||
> + (tunnel->i_seqno && (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) {
> + tunnel->dev->stats.rx_fifo_errors++;
> + tunnel->dev->stats.rx_errors++;
> + goto drop;
> + }
> + tunnel->i_seqno = ntohl(tpi->seq) + 1;
> + }
> +
> + /* Warning: All skb pointers will be invalidated! */
> + if (tunnel->dev->type == ARPHRD_ETHER) {
> + if (!pskb_may_pull(skb, ETH_HLEN)) {
> + tunnel->dev->stats.rx_length_errors++;
> + tunnel->dev->stats.rx_errors++;
> + goto drop;
> + }
> +
> + iph = ip_hdr(skb);
> + skb->protocol = eth_type_trans(skb, tunnel->dev);
> + skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
> + }
> +
> + __skb_tunnel_rx(skb, tunnel->dev);
> +
> + skb_reset_network_header(skb);
> + iph = ip_hdr(skb);
> + err = IP_ECN_decapsulate(iph, skb);
> + if (unlikely(err)) {
> + if (log_ecn_error)
> + net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
> + &iph->saddr, iph->tos);
> + if (err > 1) {
> + ++tunnel->dev->stats.rx_frame_errors;
> + ++tunnel->dev->stats.rx_errors;
> + goto drop;
> + }
> + }
> +
> + tstats = this_cpu_ptr(tunnel->dev->tstats);
> + u64_stats_update_begin(&tstats->syncp);
> + tstats->rx_packets++;
> + tstats->rx_bytes += skb->len;
> + u64_stats_update_end(&tstats->syncp);
> +
> + gro_cells_receive(&tunnel->gro_cells, skb);
> +
> + return 0;
> +
> +drop:
> + kfree_skb(skb);
> + return 0;
> +}
> +EXPORT_SYMBOL(ip_tunnel_rcv);
> +
> +static void build_ip_header(struct iphdr *iph, struct flowi4 *fl4, int proto,
> + __be16 df, u8 tos, u8 ttl)
> +{
> + /*
> + * Push down and install the IPIP header.
> + */
> +
> + iph->version = 4;
> + iph->ihl = sizeof(struct iphdr) >> 2;
> + iph->frag_off = df;
> + iph->protocol = proto;
> + iph->tos = tos;
> + iph->daddr = fl4->daddr;
> + iph->saddr = fl4->saddr;
> + iph->ttl = ttl;
> +}
> +
> +static inline struct rtable *ip_route_output_tunnel(struct net *net,
> + struct flowi4 *fl4,
> + int proto,
> + __be32 daddr, __be32 saddr,
> + __be32 key, __u8 tos, int oif)
> +{
> + memset(fl4, 0, sizeof(*fl4));
> + fl4->flowi4_oif = oif;
> + fl4->daddr = daddr;
> + fl4->saddr = saddr;
> + fl4->flowi4_tos = tos;
> + fl4->flowi4_proto = proto;
> + fl4->fl4_gre_key = key;
> + return ip_route_output_key(net, fl4);
> +}
> +
> +int ip_tunnel_build_iphdr(struct sk_buff *skb, struct net_device *dev,
> + const struct iphdr *tiph, int hlen,
> + struct iphdr *niph)
> +{
> + struct ip_tunnel *tunnel = netdev_priv(dev);
> + const struct iphdr *old_iph = ip_hdr(skb);
> + struct flowi4 fl4;
> + u8 tos, ttl;
> + __be16 df;
> + struct rtable *rt; /* Route to the other host */
> + struct net_device *tdev; /* Device to other host */
> + unsigned int max_headroom; /* The extra header space needed */
> + __be32 dst;
> + int t_hlen = tunnel->hlen + sizeof(struct iphdr);
> +
> + if (dev->type == ARPHRD_ETHER)
> + IPCB(skb)->flags = 0;
> +
> + dst = tiph->daddr;
> + if (dst == 0) {
> + /* NBMA tunnel */
> +
> + if (skb_dst(skb) == NULL) {
> + dev->stats.tx_fifo_errors++;
> + goto tx_error;
> + }
> +
> + if (skb->protocol == htons(ETH_P_IP)) {
> + rt = skb_rtable(skb);
> + dst = rt_nexthop(rt, old_iph->daddr);
> + }
> +#if IS_ENABLED(CONFIG_IPV6)
> + else if (skb->protocol == htons(ETH_P_IPV6)) {
> + const struct in6_addr *addr6;
> + struct neighbour *neigh;
> + bool do_tx_error_icmp;
> + int addr_type;
> +
> + neigh = dst_neigh_lookup(skb_dst(skb),
> + &ipv6_hdr(skb)->daddr);
> + if (neigh == NULL)
> + goto tx_error;
> +
> + addr6 = (const struct in6_addr *)&neigh->primary_key;
> + addr_type = ipv6_addr_type(addr6);
> +
> + if (addr_type == IPV6_ADDR_ANY) {
> + addr6 = &ipv6_hdr(skb)->daddr;
> + addr_type = ipv6_addr_type(addr6);
> + }
> +
> + if ((addr_type & IPV6_ADDR_COMPATv4) == 0)
> + do_tx_error_icmp = true;
> + else {
> + do_tx_error_icmp = false;
> + dst = addr6->s6_addr32[3];
> + }
> + neigh_release(neigh);
> + if (do_tx_error_icmp)
> + goto tx_error_icmp;
> + }
> +#endif
> + else
> + goto tx_error;
> + }
> +
> + tos = tiph->tos;
> + if (tos == 1) {
> + tos = 0;
> + if (skb->protocol == htons(ETH_P_IP))
> + tos = old_iph->tos;
> + else if (skb->protocol == htons(ETH_P_IPV6))
> + tos = ipv6_get_dsfield((const struct ipv6hdr *)old_iph);
> + }
> +
> + rt = ip_route_output_tunnel(dev_net(dev), &fl4,
> + tunnel->parms.iph.protocol,
> + dst, tiph->saddr,
> + tunnel->parms.o_key, RT_TOS(tos),
> + tunnel->parms.link);
> + if (IS_ERR(rt)) {
> + dev->stats.tx_carrier_errors++;
> + goto tx_error;
> + }
> + tdev = rt->dst.dev;
> +
> + if (tdev == dev) {
> + ip_rt_put(rt);
> + dev->stats.collisions++;
> + goto tx_error;
> + }
> +
> + df = tiph->frag_off;
> + if (dev->type != ARPHRD_ETHER) {
> + int mtu;
> +
> + if (df)
> + mtu = dst_mtu(&rt->dst) - dev->hard_header_len - t_hlen;
> + else
> + mtu = skb_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu;
> +
> + if (skb_dst(skb))
> + skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
> +
> + if (skb->protocol == htons(ETH_P_IP)) {
> + df |= (old_iph->frag_off&htons(IP_DF));
> +
> + if ((old_iph->frag_off&htons(IP_DF)) &&
> + mtu < ntohs(old_iph->tot_len)) {
> + icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
> + ip_rt_put(rt);
> + goto tx_error;
> + }
> + }
> +#if IS_ENABLED(CONFIG_IPV6)
> + else if (skb->protocol == htons(ETH_P_IPV6)) {
> + struct rt6_info *rt6 = (struct rt6_info *)skb_dst(skb);
> +
> + if (rt6 && mtu < dst_mtu(skb_dst(skb)) &&
> + mtu >= IPV6_MIN_MTU) {
> + if ((tunnel->parms.iph.daddr &&
> + !ipv4_is_multicast(tunnel->parms.iph.daddr)) ||
> + rt6->rt6i_dst.plen == 128) {
> + rt6->rt6i_flags |= RTF_MODIFIED;
> + dst_metric_set(skb_dst(skb), RTAX_MTU, mtu);
> + }
> + }
> +
> + if (mtu >= IPV6_MIN_MTU &&
> + mtu < skb->len - t_hlen + hlen) {
> + icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
> + ip_rt_put(rt);
> + goto tx_error;
> + }
> + }
> +#endif
> + }
> +
> + if (tunnel->err_count > 0) {
> + if (time_before(jiffies,
> + tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
> + tunnel->err_count--;
> +
> + dst_link_failure(skb);
> + } else
> + tunnel->err_count = 0;
> + }
> +
> + tos = ip_tunnel_ecn_encap(tos, old_iph, skb);
> +
> + ttl = tiph->ttl;
> + if (ttl == 0) {
> + if (skb->protocol == htons(ETH_P_IP))
> + ttl = old_iph->ttl;
> +#if IS_ENABLED(CONFIG_IPV6)
> + else if (skb->protocol == htons(ETH_P_IPV6))
> + ttl = ((const struct ipv6hdr *)old_iph)->hop_limit;
> +#endif
> + else
> + ttl = ip4_dst_hoplimit(&rt->dst);
> + }
> +
> + max_headroom = LL_RESERVED_SPACE(tdev) + hlen + rt->dst.header_len;
> + if (max_headroom > dev->needed_headroom)
> + dev->needed_headroom = max_headroom;
> +
> + /* Push down and install the IPIP header. */
> +
> + build_ip_header(niph, &fl4, tunnel->parms.iph.protocol, df, tos, ttl);
> + skb_dst_drop(skb);
> + skb_dst_set(skb, &rt->dst);
> + return 0;
> +
> +#if IS_ENABLED(CONFIG_IPV6)
> +tx_error_icmp:
> + dst_link_failure(skb);
> +#endif
> +tx_error:
> + dev->stats.tx_errors++;
> + dev_kfree_skb(skb);
> + return -1;
> +}
> +EXPORT_SYMBOL(ip_tunnel_build_iphdr);
> +
> +static void free_linked_skbs(struct sk_buff *skb)
> +{
> + while (skb) {
> + struct sk_buff *next = skb->next;
> + kfree_skb(skb);
> + skb = next;
> + }
> +}
> +
> +
> +static int send_frags(struct sk_buff *skb,
> + int tunnel_hlen)
> +{
> + int sent_len;
> +
> + sent_len = 0;
> + while (skb) {
> + struct sk_buff *next = skb->next;
> + int frag_len = skb->len - tunnel_hlen;
> + int err;
> +
> + skb->next = NULL;
> + memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
> +
> + err = ip_local_out(skb);
> + skb = next;
> + if (unlikely(net_xmit_eval(err)))
> + goto free_frags;
> + sent_len += frag_len;
> + }
> +
> + return sent_len;
> +
> +free_frags:
> + /*
> + * There's no point in continuing to send fragments once one has been
> + * dropped so just free the rest. This may help improve the congestion
> + * that caused the first packet to be dropped.
> + */
> + free_linked_skbs(skb);
> + return sent_len;
> +}
> +
> +
> +static struct sk_buff *handle_offloads(struct sk_buff *skb)
> +{
> + int err;
> +
> + if (skb_is_gso(skb)) {
> + return skb;
> + } else if (skb->ip_summed == CHECKSUM_PARTIAL) {
> + /* Pages aren't locked and could change at any time.
> + * If this happens after we compute the checksum, the
> + * checksum will be wrong. We linearize now to avoid
> + * this problem.
> + */
> + err = __skb_linearize(skb);
> + if (unlikely(err))
> + goto error;
> +
> + err = skb_checksum_help(skb);
> + if (unlikely(err))
> + goto error;
> + }
> +
> + skb->ip_summed = CHECKSUM_NONE;
> +
> + return skb;
> +
> +error:
> + kfree_skb(skb);
> + return ERR_PTR(err);
> +}
> +
> +
> +int ip_tunnel_xmit(struct sk_buff *skb,
> + const struct iphdr *tiph,
> + const struct tnl_ptk_info *tpi,
> + struct sk_buff *(*build_header)(struct sk_buff *skb,
> + const struct tnl_ptk_info *tpi))
> +{
> + int sent_len = 0;
> + struct dst_entry *dst = skb_dst(skb);
> + int tunnel_hlen = tpi->hdr_len + sizeof(struct iphdr);
> +
> + skb = handle_offloads(skb);
> + if (IS_ERR(skb))
> + goto error;
> +
> + while (skb) {
> + struct iphdr *iph;
> + struct sk_buff *next_skb = skb->next;
> +
> + skb->next = NULL;
> +
> + if (vlan_tx_tag_present(skb)) {
> + skb = __vlan_put_tag(skb, vlan_tx_tag_get(skb));
> + if (unlikely(!skb))
> + goto next;
> + }
> +
> +
> + skb_push(skb, tunnel_hlen);
> + skb_reset_network_header(skb);
> + skb_set_transport_header(skb, sizeof(struct iphdr));
> +
> + if (next_skb)
> + skb_dst_set(skb, dst_clone(dst));
> + else
> + skb_dst_set(skb, dst);
> +
> + /* Push IP header. */
> + iph = ip_hdr(skb);
> + *iph = *tiph;
> +
> + ip_select_ident(iph, dst, NULL);
> +
> + /* Push Tunnel header. */
> + skb = (*build_header)(skb, tpi);
> + if (!skb)
> + goto next;
> +
> + sent_len += send_frags(skb, tunnel_hlen);
> +
> +next:
> + skb = next_skb;
> + }
> +
> + return sent_len;
> +error:
> + dst_release(dst);
> + return 0;
> +}
> +EXPORT_SYMBOL(ip_tunnel_xmit);
> +
> +int ip_tunnel_bind_dev(struct net_device *dev)
> +{
> + struct net_device *tdev = NULL;
> + struct ip_tunnel *tunnel = netdev_priv(dev);
> + const struct iphdr *iph;
> + int hlen = LL_MAX_HEADER;
> + int mtu = ETH_DATA_LEN;
> + int t_hlen = tunnel->hlen + sizeof(struct iphdr);
> +
> + iph = &tunnel->parms.iph;
> +
> + /* Guess output device to choose reasonable mtu and needed_headroom */
> +
> + if (iph->daddr) {
> + struct flowi4 fl4;
> + struct rtable *rt;
> +
> + rt = ip_route_output_tunnel(dev_net(dev), &fl4,
> + tunnel->parms.iph.protocol,
> + iph->daddr, iph->saddr,
> + tunnel->parms.o_key,
> + RT_TOS(iph->tos),
> + tunnel->parms.link);
> + if (!IS_ERR(rt)) {
> + tdev = rt->dst.dev;
> + ip_rt_put(rt);
> + }
> +
> + }
> +
> + if (!tdev && tunnel->parms.link)
> + tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link);
> +
> + if (tdev) {
> + hlen = tdev->hard_header_len + tdev->needed_headroom;
> + mtu = tdev->mtu;
> + }
> + dev->iflink = tunnel->parms.link;
> +
> + dev->needed_headroom = t_hlen + hlen;
> + mtu -= (dev->hard_header_len + t_hlen);
> +
> + if (mtu < 68)
> + mtu = 68;
> +
> + return mtu;
> +}
> +EXPORT_SYMBOL(ip_tunnel_bind_dev);
> +
> +int ip_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
> +{
> + int err = 0;
> + struct ip_tunnel_parm p;
> + struct ip_tunnel *t;
> + struct net *net = dev_net(dev);
> + struct ip_tunnel *tunnel = netdev_priv(dev);
> + struct ip_tunnel_net *itn = net_generic(net, tunnel->ipt_net_id);
> +
> + BUG_ON(!itn->fb_tunnel_dev);
> + switch (cmd) {
> + case SIOCGETTUNNEL:
> + t = NULL;
> + if (dev == itn->fb_tunnel_dev) {
> + err = itn->ops->get_ioctl_param(dev, ifr, &p);
> + if (err)
> + break;
> +
> +
> + t = ip_tunnel_find(itn, &p, itn->fb_tunnel_dev->type);
> + }
> + if (t == NULL)
> + t = netdev_priv(dev);
> + memcpy(&p, &t->parms, sizeof(p));
> + if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
> + err = -EFAULT;
> + break;
> +
> + case SIOCADDTUNNEL:
> + case SIOCCHGTUNNEL:
> + err = -EPERM;
> + if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
> + goto done;
> +
> + err = itn->ops->get_ioctl_param(dev, ifr, &p);
> + if (err)
> + break;
> +
> + t = ip_tunnel_find(itn, &p, itn->fb_tunnel_dev->type);
> +
> + if (!t && (cmd == SIOCADDTUNNEL))
> + t = ip_tunnel_create(net, itn, &p);
> +
> + if (dev != itn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
> + if (t != NULL) {
> + if (t->dev != dev) {
> + err = -EEXIST;
> + break;
> + }
> + } else {
> + unsigned int nflags = 0;
> +
> + if (ipv4_is_multicast(p.iph.daddr))
> + nflags = IFF_BROADCAST;
> + else if (p.iph.daddr)
> + nflags = IFF_POINTOPOINT;
> +
> + if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) {
> + err = -EINVAL;
> + break;
> + }
> +
> + t = netdev_priv(dev);
> + ip_tunnel_unlink(itn, t);
> + synchronize_net();
> +
> + t->parms.iph.saddr = p.iph.saddr;
> + t->parms.iph.daddr = p.iph.daddr;
> + t->parms.i_key = p.i_key;
> + t->parms.o_key = p.o_key;
> + memcpy(dev->dev_addr, &p.iph.saddr, 4);
> + memcpy(dev->broadcast, &p.iph.daddr, 4);
> + ip_tunnel_link(itn, t);
> + netdev_state_change(dev);
> + }
> + }
> +
> + if (t) {
> + err = 0;
> + if (cmd == SIOCCHGTUNNEL) {
> + t->parms.iph.ttl = p.iph.ttl;
> + t->parms.iph.tos = p.iph.tos;
> + t->parms.iph.frag_off = p.iph.frag_off;
> + if (t->parms.link != p.link) {
> + t->parms.link = p.link;
> + dev->mtu = ip_tunnel_bind_dev(dev);
> + netdev_state_change(dev);
> + }
> + }
> + if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
> + err = -EFAULT;
> + } else
> + err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
> + break;
> +
> + case SIOCDELTUNNEL:
> + err = -EPERM;
> + if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
> + goto done;
> +
> + if (dev == itn->fb_tunnel_dev) {
> + err = itn->ops->get_ioctl_param(dev, ifr, &p);
> + if (err)
> + break;
> +
> + err = -ENOENT;
> + t = ip_tunnel_find(itn, &p, itn->fb_tunnel_dev->type);
> + if (t == NULL)
> + goto done;
> + err = -EPERM;
> + if (t == netdev_priv(itn->fb_tunnel_dev))
> + goto done;
> + dev = t->dev;
> + }
> + unregister_netdevice(dev);
> + err = 0;
> + break;
> +
> + default:
> + err = -EINVAL;
> + }
> +
> +done:
> + return err;
> +}
> +EXPORT_SYMBOL(ip_tunnel_ioctl);
> +
> +int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu)
> +{
> + struct ip_tunnel *tunnel = netdev_priv(dev);
> + int t_hlen = tunnel->hlen + sizeof(struct iphdr);
> +
> + if (new_mtu < 68 ||
> + new_mtu > 0xFFF8 - dev->hard_header_len - t_hlen)
> + return -EINVAL;
> + dev->mtu = new_mtu;
> + return 0;
> +}
> +EXPORT_SYMBOL(ip_tunnel_change_mtu);
> +
> +
> +void ip_tunnel_dev_free(struct net_device *dev)
> +{
> + struct ip_tunnel *tunnel = netdev_priv(dev);
> +
> + gro_cells_destroy(&tunnel->gro_cells);
> + free_percpu(dev->tstats);
> + free_netdev(dev);
> +}
> +EXPORT_SYMBOL(ip_tunnel_dev_free);
> +
> +void ip_tunnel_dellink(struct net_device *dev, struct list_head *head)
> +{
> + struct net *net = dev_net(dev);
> + struct ip_tunnel *tunnel = netdev_priv(dev);
> + struct ip_tunnel_net *itn;
> +
> + itn = net_generic(net, tunnel->ipt_net_id);
> +
> + if (itn->fb_tunnel_dev != dev) {
> + ip_tunnel_unlink(itn, netdev_priv(dev));
> + unregister_netdevice_queue(dev, head);
> + }
> +}
> +EXPORT_SYMBOL(ip_tunnel_dellink);
> +
> +int __net_init ip_tunnel_init_net(struct net *net, int ipt_net_id,
> + struct rtnl_link_ops *ops)
> +{
> + struct ip_tunnel_net *itn = net_generic(net, ipt_net_id);
> + struct ip_tunnel_parm parms;
> +
> + itn->tunnels = kzalloc(sizeof(void *) * IPT_HASH_SIZE, GFP_KERNEL);
> + if (!itn->tunnels)
> + return -ENOMEM;
> +
> + if (!ops) {
> + itn->fb_tunnel_dev = NULL;
> + return 0;
> + }
> + memset(&parms, 0, sizeof(parms));
> + rtnl_lock();
> + itn->fb_tunnel_dev = __ip_tunnel_create(net, ops, &parms);
> + if (IS_ERR(itn->fb_tunnel_dev)) {
> + rtnl_unlock();
> + kfree(itn->tunnels);
> + return PTR_ERR(itn->fb_tunnel_dev);
> + }
> +
> + rtnl_unlock();
> + return 0;
> +}
> +EXPORT_SYMBOL(ip_tunnel_init_net);
> +
> +static void ip_tunnel_destroy(struct ip_tunnel_net *itn, struct list_head *head)
> +{
> +
> + int h;
> + for (h = 0; h < IPT_HASH_SIZE; h++) {
> + struct ip_tunnel *t;
> +
> + t = rtnl_dereference(itn->tunnels[h]);
> +
> + while (t != NULL) {
> + unregister_netdevice_queue(t->dev, head);
> + t = rtnl_dereference(t->next);
> + }
> + }
> + if (itn->fb_tunnel_dev)
> + unregister_netdevice_queue(itn->fb_tunnel_dev, head);
> +}
> +
> +void __net_exit ip_tunnel_delete_net(struct ip_tunnel_net *itn)
> +{
> + LIST_HEAD(list);
> +
> + rtnl_lock();
> + ip_tunnel_destroy(itn, &list);
> + unregister_netdevice_many(&list);
> + rtnl_unlock();
> + kfree(itn->tunnels);
> +}
> +EXPORT_SYMBOL(ip_tunnel_delete_net);
> +
> +/* Can be moved to ip-tunnel */
> +int ip_tunnel_newlink(struct net *src_net, struct net_device *dev,
> + struct nlattr *tb[],
> + struct nlattr *data[])
> +{
> + struct ip_tunnel *nt;
> + struct net *net = dev_net(dev);
> + struct ip_tunnel_net *itn;
> + int mtu;
> + int err;
> +
> + nt = netdev_priv(dev);
> + itn = net_generic(net, nt->ipt_net_id);
> + err = itn->ops->parse_netlink_parms(nt, data, tb, &nt->parms);
> + if (err)
> + return err;
> +
> + if (ip_tunnel_find(itn, &nt->parms, dev->type))
> + return -EEXIST;
> +
> + err = register_netdevice(dev);
> + if (err)
> + goto out;
> +
> + if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
> + eth_hw_addr_random(dev);
> +
> + mtu = ip_tunnel_bind_dev(dev);
> + if (!tb[IFLA_MTU])
> + dev->mtu = mtu;
> +
> + ip_tunnel_link(itn, nt);
> +
> +out:
> + return err;
> +}
> +EXPORT_SYMBOL(ip_tunnel_newlink);
> +
> +int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[],
> + struct nlattr *data[])
> +{
> + struct ip_tunnel *t, *nt;
> + struct net *net = dev_net(dev);
> + struct ip_tunnel *tunnel = netdev_priv(dev);
> + struct ip_tunnel_net *itn = net_generic(net, tunnel->ipt_net_id);
> +
> + struct ip_tunnel_parm p;
> + int mtu;
> +
> + if (dev == itn->fb_tunnel_dev)
> + return -EINVAL;
> +
> + nt = netdev_priv(dev);
> + itn->ops->parse_netlink_parms(nt, data, tb, &p);
> +
> + t = ip_tunnel_find(itn, &p, dev->type);
> +
> + if (t) {
> + if (t->dev != dev)
> + return -EEXIST;
> + } else {
> + t = nt;
> +
> + if (dev->type != ARPHRD_ETHER) {
> + unsigned int nflags = 0;
> +
> + if (ipv4_is_multicast(p.iph.daddr))
> + nflags = IFF_BROADCAST;
> + else if (p.iph.daddr)
> + nflags = IFF_POINTOPOINT;
> +
> + if ((dev->flags ^ nflags) &
> + (IFF_POINTOPOINT | IFF_BROADCAST))
> + return -EINVAL;
> + }
> +
> + ip_tunnel_unlink(itn, t);
> + t->parms.iph.saddr = p.iph.saddr;
> + t->parms.iph.daddr = p.iph.daddr;
> + t->parms.i_key = p.i_key;
> + if (dev->type != ARPHRD_ETHER) {
> + memcpy(dev->dev_addr, &p.iph.saddr, 4);
> + memcpy(dev->broadcast, &p.iph.daddr, 4);
> + }
> + ip_tunnel_link(itn, t);
> + netdev_state_change(dev);
> + }
> +
> + t->parms.o_key = p.o_key;
> + t->parms.iph.ttl = p.iph.ttl;
> + t->parms.iph.tos = p.iph.tos;
> + t->parms.iph.frag_off = p.iph.frag_off;
> +
> + if (t->parms.link != p.link) {
> + t->parms.link = p.link;
> + mtu = ip_tunnel_bind_dev(dev);
> + if (!tb[IFLA_MTU])
> + dev->mtu = mtu;
> + netdev_state_change(dev);
> + }
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(ip_tunnel_changelink);
> +
> +int ip_tunnel_init(struct net_device *dev)
> +{
> + struct ip_tunnel *tunnel = netdev_priv(dev);
> + struct iphdr *iph;
> + int err;
> +
> + dev->destructor = ip_tunnel_dev_free;
> + dev->tstats = alloc_percpu(struct pcpu_tstats);
> + if (!dev->tstats)
> + return -ENOMEM;
> +
> + err = gro_cells_init(&tunnel->gro_cells, dev);
> + if (err) {
> + free_percpu(dev->tstats);
> + return err;
> + }
> +
> + tunnel->dev = dev;
> + strcpy(tunnel->parms.name, dev->name);
> +
> + iph = &tunnel->parms.iph;
> + iph->version = 4;
> + iph->ihl = 5;
> +
> + /* Can use a lockless transmit, unless we generate output sequences */
> + if (!(tunnel->parms.o_flags & TUNNEL_SEQ))
> + dev->features |= NETIF_F_LLTX;
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(ip_tunnel_init);
> +
> +void ip_tunnel_uninit(struct net_device *dev)
> +{
> + struct net *net = dev_net(dev);
> + struct ip_tunnel *tunnel = netdev_priv(dev);
> + struct ip_tunnel_net *itn;
> +
> + itn = net_generic(net, tunnel->ipt_net_id);
> + /* fb_tunnel_dev will be unregisted in net-exit call. */
> + if (itn->fb_tunnel_dev != dev)
> + ip_tunnel_unlink(itn, netdev_priv(dev));
> +}
> +EXPORT_SYMBOL(ip_tunnel_uninit);
> +
> +
> +struct hlist_head ipt_proto[IPT_HASH_BUCKETS];
> +EXPORT_SYMBOL(ipt_proto);
> +
> +int ipt_add_protocol(struct ipt_protocol *newp)
> +{
> + struct hlist_head *head;
> + struct ipt_protocol *ipt = NULL;
> + struct hlist_node *n;
> + ASSERT_RTNL();
> +
> + head = ipt_hash_bucket(newp->type, newp->portno);
> +
> + hlist_for_each_entry_rcu(ipt, n, head, node) {
> + if (ipt->type != newp->type || ipt->portno != newp->portno)
> + continue;
> + if (ipt->priority > newp->priority) {
> + hlist_add_before_rcu(&newp->node, &ipt->node);
> + return 0;
> + }
> + if (ipt->priority == newp->priority)
> + return -1;
> + }
> + if (ipt)
> + hlist_add_after_rcu(&newp->node, &ipt->node);
> + else
> + hlist_add_head_rcu(&newp->node, head);
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(ipt_add_protocol);
> +
> +void ipt_del_protocol(struct ipt_protocol *proto)
> +{
> + ASSERT_RTNL();
> +
> + hlist_del_rcu(&proto->node);
> + synchronize_rcu();
> +}
> +EXPORT_SYMBOL_GPL(ipt_del_protocol);
> +
> +static int __init ip_tunnel_mod_init(void)
> +{
> + pr_info("IP_Tunnel init\n");
> + get_random_bytes(&ip_tunnel_salt, sizeof(ip_tunnel_salt));
> + return 0;
> +}
> +static void __exit ip_tunnel_fini(void)
> +{
> +}
> +
> +module_init(ip_tunnel_mod_init);
> +module_exit(ip_tunnel_fini);
> +MODULE_LICENSE("GPL");
> diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
> index fb828e9..1b19ba6 100644
> --- a/net/ipv6/ip6_tunnel.c
> +++ b/net/ipv6/ip6_tunnel.c
> @@ -47,6 +47,7 @@
>
> #include <net/icmp.h>
> #include <net/ip.h>
> +#include <net/ipip.h>
> #include <net/ipv6.h>
> #include <net/ip6_route.h>
> #include <net/addrconf.h>
> --
> 1.7.1
>
> _______________________________________________
> dev mailing list
> dev at openvswitch.org
> http://openvswitch.org/mailman/listinfo/dev
>
--
yamahata
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