mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
533 lines
13 KiB
533 lines
13 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
|
#ifndef __NET_IP_TUNNELS_H |
|
#define __NET_IP_TUNNELS_H 1 |
|
|
|
#include <linux/if_tunnel.h> |
|
#include <linux/netdevice.h> |
|
#include <linux/skbuff.h> |
|
#include <linux/socket.h> |
|
#include <linux/types.h> |
|
#include <linux/u64_stats_sync.h> |
|
#include <linux/bitops.h> |
|
|
|
#include <net/dsfield.h> |
|
#include <net/gro_cells.h> |
|
#include <net/inet_ecn.h> |
|
#include <net/netns/generic.h> |
|
#include <net/rtnetlink.h> |
|
#include <net/lwtunnel.h> |
|
#include <net/dst_cache.h> |
|
|
|
#if IS_ENABLED(CONFIG_IPV6) |
|
#include <net/ipv6.h> |
|
#include <net/ip6_fib.h> |
|
#include <net/ip6_route.h> |
|
#endif |
|
|
|
/* Keep error state on tunnel for 30 sec */ |
|
#define IPTUNNEL_ERR_TIMEO (30*HZ) |
|
|
|
/* Used to memset ip_tunnel padding. */ |
|
#define IP_TUNNEL_KEY_SIZE offsetofend(struct ip_tunnel_key, tp_dst) |
|
|
|
/* Used to memset ipv4 address padding. */ |
|
#define IP_TUNNEL_KEY_IPV4_PAD offsetofend(struct ip_tunnel_key, u.ipv4.dst) |
|
#define IP_TUNNEL_KEY_IPV4_PAD_LEN \ |
|
(sizeof_field(struct ip_tunnel_key, u) - \ |
|
sizeof_field(struct ip_tunnel_key, u.ipv4)) |
|
|
|
struct ip_tunnel_key { |
|
__be64 tun_id; |
|
union { |
|
struct { |
|
__be32 src; |
|
__be32 dst; |
|
} ipv4; |
|
struct { |
|
struct in6_addr src; |
|
struct in6_addr dst; |
|
} ipv6; |
|
} u; |
|
__be16 tun_flags; |
|
u8 tos; /* TOS for IPv4, TC for IPv6 */ |
|
u8 ttl; /* TTL for IPv4, HL for IPv6 */ |
|
__be32 label; /* Flow Label for IPv6 */ |
|
__be16 tp_src; |
|
__be16 tp_dst; |
|
}; |
|
|
|
/* Flags for ip_tunnel_info mode. */ |
|
#define IP_TUNNEL_INFO_TX 0x01 /* represents tx tunnel parameters */ |
|
#define IP_TUNNEL_INFO_IPV6 0x02 /* key contains IPv6 addresses */ |
|
#define IP_TUNNEL_INFO_BRIDGE 0x04 /* represents a bridged tunnel id */ |
|
|
|
/* Maximum tunnel options length. */ |
|
#define IP_TUNNEL_OPTS_MAX \ |
|
GENMASK((sizeof_field(struct ip_tunnel_info, \ |
|
options_len) * BITS_PER_BYTE) - 1, 0) |
|
|
|
struct ip_tunnel_info { |
|
struct ip_tunnel_key key; |
|
#ifdef CONFIG_DST_CACHE |
|
struct dst_cache dst_cache; |
|
#endif |
|
u8 options_len; |
|
u8 mode; |
|
}; |
|
|
|
/* 6rd prefix/relay information */ |
|
#ifdef CONFIG_IPV6_SIT_6RD |
|
struct ip_tunnel_6rd_parm { |
|
struct in6_addr prefix; |
|
__be32 relay_prefix; |
|
u16 prefixlen; |
|
u16 relay_prefixlen; |
|
}; |
|
#endif |
|
|
|
struct ip_tunnel_encap { |
|
u16 type; |
|
u16 flags; |
|
__be16 sport; |
|
__be16 dport; |
|
}; |
|
|
|
struct ip_tunnel_prl_entry { |
|
struct ip_tunnel_prl_entry __rcu *next; |
|
__be32 addr; |
|
u16 flags; |
|
struct rcu_head rcu_head; |
|
}; |
|
|
|
struct metadata_dst; |
|
|
|
struct ip_tunnel { |
|
struct ip_tunnel __rcu *next; |
|
struct hlist_node hash_node; |
|
struct net_device *dev; |
|
struct net *net; /* netns for packet i/o */ |
|
|
|
unsigned long err_time; /* Time when the last ICMP error |
|
* arrived */ |
|
int err_count; /* Number of arrived ICMP errors */ |
|
|
|
/* These four fields used only by GRE */ |
|
u32 i_seqno; /* The last seen seqno */ |
|
u32 o_seqno; /* The last output seqno */ |
|
int tun_hlen; /* Precalculated header length */ |
|
|
|
/* These four fields used only by ERSPAN */ |
|
u32 index; /* ERSPAN type II index */ |
|
u8 erspan_ver; /* ERSPAN version */ |
|
u8 dir; /* ERSPAN direction */ |
|
u16 hwid; /* ERSPAN hardware ID */ |
|
|
|
struct dst_cache dst_cache; |
|
|
|
struct ip_tunnel_parm parms; |
|
|
|
int mlink; |
|
int encap_hlen; /* Encap header length (FOU,GUE) */ |
|
int hlen; /* tun_hlen + encap_hlen */ |
|
struct ip_tunnel_encap encap; |
|
|
|
/* for SIT */ |
|
#ifdef CONFIG_IPV6_SIT_6RD |
|
struct ip_tunnel_6rd_parm ip6rd; |
|
#endif |
|
struct ip_tunnel_prl_entry __rcu *prl; /* potential router list */ |
|
unsigned int prl_count; /* # of entries in PRL */ |
|
unsigned int ip_tnl_net_id; |
|
struct gro_cells gro_cells; |
|
__u32 fwmark; |
|
bool collect_md; |
|
bool ignore_df; |
|
}; |
|
|
|
struct tnl_ptk_info { |
|
__be16 flags; |
|
__be16 proto; |
|
__be32 key; |
|
__be32 seq; |
|
int hdr_len; |
|
}; |
|
|
|
#define PACKET_RCVD 0 |
|
#define PACKET_REJECT 1 |
|
#define PACKET_NEXT 2 |
|
|
|
#define IP_TNL_HASH_BITS 7 |
|
#define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS) |
|
|
|
struct ip_tunnel_net { |
|
struct net_device *fb_tunnel_dev; |
|
struct rtnl_link_ops *rtnl_link_ops; |
|
struct hlist_head tunnels[IP_TNL_HASH_SIZE]; |
|
struct ip_tunnel __rcu *collect_md_tun; |
|
int type; |
|
}; |
|
|
|
static inline void ip_tunnel_key_init(struct ip_tunnel_key *key, |
|
__be32 saddr, __be32 daddr, |
|
u8 tos, u8 ttl, __be32 label, |
|
__be16 tp_src, __be16 tp_dst, |
|
__be64 tun_id, __be16 tun_flags) |
|
{ |
|
key->tun_id = tun_id; |
|
key->u.ipv4.src = saddr; |
|
key->u.ipv4.dst = daddr; |
|
memset((unsigned char *)key + IP_TUNNEL_KEY_IPV4_PAD, |
|
0, IP_TUNNEL_KEY_IPV4_PAD_LEN); |
|
key->tos = tos; |
|
key->ttl = ttl; |
|
key->label = label; |
|
key->tun_flags = tun_flags; |
|
|
|
/* For the tunnel types on the top of IPsec, the tp_src and tp_dst of |
|
* the upper tunnel are used. |
|
* E.g: GRE over IPSEC, the tp_src and tp_port are zero. |
|
*/ |
|
key->tp_src = tp_src; |
|
key->tp_dst = tp_dst; |
|
|
|
/* Clear struct padding. */ |
|
if (sizeof(*key) != IP_TUNNEL_KEY_SIZE) |
|
memset((unsigned char *)key + IP_TUNNEL_KEY_SIZE, |
|
0, sizeof(*key) - IP_TUNNEL_KEY_SIZE); |
|
} |
|
|
|
static inline bool |
|
ip_tunnel_dst_cache_usable(const struct sk_buff *skb, |
|
const struct ip_tunnel_info *info) |
|
{ |
|
if (skb->mark) |
|
return false; |
|
if (!info) |
|
return true; |
|
if (info->key.tun_flags & TUNNEL_NOCACHE) |
|
return false; |
|
|
|
return true; |
|
} |
|
|
|
static inline unsigned short ip_tunnel_info_af(const struct ip_tunnel_info |
|
*tun_info) |
|
{ |
|
return tun_info->mode & IP_TUNNEL_INFO_IPV6 ? AF_INET6 : AF_INET; |
|
} |
|
|
|
static inline __be64 key32_to_tunnel_id(__be32 key) |
|
{ |
|
#ifdef __BIG_ENDIAN |
|
return (__force __be64)key; |
|
#else |
|
return (__force __be64)((__force u64)key << 32); |
|
#endif |
|
} |
|
|
|
/* Returns the least-significant 32 bits of a __be64. */ |
|
static inline __be32 tunnel_id_to_key32(__be64 tun_id) |
|
{ |
|
#ifdef __BIG_ENDIAN |
|
return (__force __be32)tun_id; |
|
#else |
|
return (__force __be32)((__force u64)tun_id >> 32); |
|
#endif |
|
} |
|
|
|
#ifdef CONFIG_INET |
|
|
|
static inline void ip_tunnel_init_flow(struct flowi4 *fl4, |
|
int proto, |
|
__be32 daddr, __be32 saddr, |
|
__be32 key, __u8 tos, int oif, |
|
__u32 mark, __u32 tun_inner_hash) |
|
{ |
|
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; |
|
fl4->flowi4_mark = mark; |
|
fl4->flowi4_multipath_hash = tun_inner_hash; |
|
} |
|
|
|
int ip_tunnel_init(struct net_device *dev); |
|
void ip_tunnel_uninit(struct net_device *dev); |
|
void ip_tunnel_dellink(struct net_device *dev, struct list_head *head); |
|
struct net *ip_tunnel_get_link_net(const struct net_device *dev); |
|
int ip_tunnel_get_iflink(const struct net_device *dev); |
|
int ip_tunnel_init_net(struct net *net, unsigned int ip_tnl_net_id, |
|
struct rtnl_link_ops *ops, char *devname); |
|
|
|
void ip_tunnel_delete_nets(struct list_head *list_net, unsigned int id, |
|
struct rtnl_link_ops *ops); |
|
|
|
void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, |
|
const struct iphdr *tnl_params, const u8 protocol); |
|
void ip_md_tunnel_xmit(struct sk_buff *skb, struct net_device *dev, |
|
const u8 proto, int tunnel_hlen); |
|
int ip_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd); |
|
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, bool strict); |
|
int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu); |
|
|
|
struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn, |
|
int link, __be16 flags, |
|
__be32 remote, __be32 local, |
|
__be32 key); |
|
|
|
int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb, |
|
const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst, |
|
bool log_ecn_error); |
|
int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[], |
|
struct ip_tunnel_parm *p, __u32 fwmark); |
|
int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[], |
|
struct ip_tunnel_parm *p, __u32 fwmark); |
|
void ip_tunnel_setup(struct net_device *dev, unsigned int net_id); |
|
|
|
extern const struct header_ops ip_tunnel_header_ops; |
|
__be16 ip_tunnel_parse_protocol(const struct sk_buff *skb); |
|
|
|
struct ip_tunnel_encap_ops { |
|
size_t (*encap_hlen)(struct ip_tunnel_encap *e); |
|
int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e, |
|
u8 *protocol, struct flowi4 *fl4); |
|
int (*err_handler)(struct sk_buff *skb, u32 info); |
|
}; |
|
|
|
#define MAX_IPTUN_ENCAP_OPS 8 |
|
|
|
extern const struct ip_tunnel_encap_ops __rcu * |
|
iptun_encaps[MAX_IPTUN_ENCAP_OPS]; |
|
|
|
int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *op, |
|
unsigned int num); |
|
int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *op, |
|
unsigned int num); |
|
|
|
int ip_tunnel_encap_setup(struct ip_tunnel *t, |
|
struct ip_tunnel_encap *ipencap); |
|
|
|
static inline bool pskb_inet_may_pull(struct sk_buff *skb) |
|
{ |
|
int nhlen; |
|
|
|
switch (skb->protocol) { |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
case htons(ETH_P_IPV6): |
|
nhlen = sizeof(struct ipv6hdr); |
|
break; |
|
#endif |
|
case htons(ETH_P_IP): |
|
nhlen = sizeof(struct iphdr); |
|
break; |
|
default: |
|
nhlen = 0; |
|
} |
|
|
|
return pskb_network_may_pull(skb, nhlen); |
|
} |
|
|
|
static inline int ip_encap_hlen(struct ip_tunnel_encap *e) |
|
{ |
|
const struct ip_tunnel_encap_ops *ops; |
|
int hlen = -EINVAL; |
|
|
|
if (e->type == TUNNEL_ENCAP_NONE) |
|
return 0; |
|
|
|
if (e->type >= MAX_IPTUN_ENCAP_OPS) |
|
return -EINVAL; |
|
|
|
rcu_read_lock(); |
|
ops = rcu_dereference(iptun_encaps[e->type]); |
|
if (likely(ops && ops->encap_hlen)) |
|
hlen = ops->encap_hlen(e); |
|
rcu_read_unlock(); |
|
|
|
return hlen; |
|
} |
|
|
|
static inline int ip_tunnel_encap(struct sk_buff *skb, struct ip_tunnel *t, |
|
u8 *protocol, struct flowi4 *fl4) |
|
{ |
|
const struct ip_tunnel_encap_ops *ops; |
|
int ret = -EINVAL; |
|
|
|
if (t->encap.type == TUNNEL_ENCAP_NONE) |
|
return 0; |
|
|
|
if (t->encap.type >= MAX_IPTUN_ENCAP_OPS) |
|
return -EINVAL; |
|
|
|
rcu_read_lock(); |
|
ops = rcu_dereference(iptun_encaps[t->encap.type]); |
|
if (likely(ops && ops->build_header)) |
|
ret = ops->build_header(skb, &t->encap, protocol, fl4); |
|
rcu_read_unlock(); |
|
|
|
return ret; |
|
} |
|
|
|
/* 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; |
|
} |
|
|
|
static inline u8 ip_tunnel_get_ttl(const struct iphdr *iph, |
|
const struct sk_buff *skb) |
|
{ |
|
if (skb->protocol == htons(ETH_P_IP)) |
|
return iph->ttl; |
|
else if (skb->protocol == htons(ETH_P_IPV6)) |
|
return ((const struct ipv6hdr *)iph)->hop_limit; |
|
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); |
|
} |
|
|
|
int __iptunnel_pull_header(struct sk_buff *skb, int hdr_len, |
|
__be16 inner_proto, bool raw_proto, bool xnet); |
|
|
|
static inline int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, |
|
__be16 inner_proto, bool xnet) |
|
{ |
|
return __iptunnel_pull_header(skb, hdr_len, inner_proto, false, xnet); |
|
} |
|
|
|
void iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb, |
|
__be32 src, __be32 dst, u8 proto, |
|
u8 tos, u8 ttl, __be16 df, bool xnet); |
|
struct metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md, |
|
gfp_t flags); |
|
int skb_tunnel_check_pmtu(struct sk_buff *skb, struct dst_entry *encap_dst, |
|
int headroom, bool reply); |
|
|
|
int iptunnel_handle_offloads(struct sk_buff *skb, int gso_type_mask); |
|
|
|
static inline int iptunnel_pull_offloads(struct sk_buff *skb) |
|
{ |
|
if (skb_is_gso(skb)) { |
|
int err; |
|
|
|
err = skb_unclone(skb, GFP_ATOMIC); |
|
if (unlikely(err)) |
|
return err; |
|
skb_shinfo(skb)->gso_type &= ~(NETIF_F_GSO_ENCAP_ALL >> |
|
NETIF_F_GSO_SHIFT); |
|
} |
|
|
|
skb->encapsulation = 0; |
|
return 0; |
|
} |
|
|
|
static inline void iptunnel_xmit_stats(struct net_device *dev, int pkt_len) |
|
{ |
|
if (pkt_len > 0) { |
|
struct pcpu_sw_netstats *tstats = get_cpu_ptr(dev->tstats); |
|
|
|
u64_stats_update_begin(&tstats->syncp); |
|
tstats->tx_bytes += pkt_len; |
|
tstats->tx_packets++; |
|
u64_stats_update_end(&tstats->syncp); |
|
put_cpu_ptr(tstats); |
|
} else { |
|
struct net_device_stats *err_stats = &dev->stats; |
|
|
|
if (pkt_len < 0) { |
|
err_stats->tx_errors++; |
|
err_stats->tx_aborted_errors++; |
|
} else { |
|
err_stats->tx_dropped++; |
|
} |
|
} |
|
} |
|
|
|
static inline void *ip_tunnel_info_opts(struct ip_tunnel_info *info) |
|
{ |
|
return info + 1; |
|
} |
|
|
|
static inline void ip_tunnel_info_opts_get(void *to, |
|
const struct ip_tunnel_info *info) |
|
{ |
|
memcpy(to, info + 1, info->options_len); |
|
} |
|
|
|
static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info, |
|
const void *from, int len, |
|
__be16 flags) |
|
{ |
|
info->options_len = len; |
|
if (len > 0) { |
|
memcpy(ip_tunnel_info_opts(info), from, len); |
|
info->key.tun_flags |= flags; |
|
} |
|
} |
|
|
|
static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate) |
|
{ |
|
return (struct ip_tunnel_info *)lwtstate->data; |
|
} |
|
|
|
DECLARE_STATIC_KEY_FALSE(ip_tunnel_metadata_cnt); |
|
|
|
/* Returns > 0 if metadata should be collected */ |
|
static inline int ip_tunnel_collect_metadata(void) |
|
{ |
|
return static_branch_unlikely(&ip_tunnel_metadata_cnt); |
|
} |
|
|
|
void __init ip_tunnel_core_init(void); |
|
|
|
void ip_tunnel_need_metadata(void); |
|
void ip_tunnel_unneed_metadata(void); |
|
|
|
#else /* CONFIG_INET */ |
|
|
|
static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate) |
|
{ |
|
return NULL; |
|
} |
|
|
|
static inline void ip_tunnel_need_metadata(void) |
|
{ |
|
} |
|
|
|
static inline void ip_tunnel_unneed_metadata(void) |
|
{ |
|
} |
|
|
|
static inline void ip_tunnel_info_opts_get(void *to, |
|
const struct ip_tunnel_info *info) |
|
{ |
|
} |
|
|
|
static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info, |
|
const void *from, int len, |
|
__be16 flags) |
|
{ |
|
info->options_len = 0; |
|
} |
|
|
|
#endif /* CONFIG_INET */ |
|
|
|
#endif /* __NET_IP_TUNNELS_H */
|
|
|