| /* 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 */ |
| u32 nhid; |
| __be16 tp_src; |
| __be16 tp_dst; |
| __u8 flow_flags; |
| }; |
| |
| struct ip_tunnel_encap { |
| u16 type; |
| u16 flags; |
| __be16 sport; |
| __be16 dport; |
| }; |
| |
| /* 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) |
| |
| #define ip_tunnel_info_opts(info) \ |
| _Generic(info, \ |
| const struct ip_tunnel_info * : ((const void *)((info) + 1)),\ |
| struct ip_tunnel_info * : ((void *)((info) + 1))\ |
| ) |
| |
| struct ip_tunnel_info { |
| struct ip_tunnel_key key; |
| struct ip_tunnel_encap encap; |
| #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_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; |
| netdevice_tracker dev_tracker; |
| |
| 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 */ |
| atomic_t 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, |
| struct net *net, int oif, |
| __u32 mark, __u32 tun_inner_hash, |
| __u8 flow_flags) |
| { |
| memset(fl4, 0, sizeof(*fl4)); |
| |
| if (oif) { |
| fl4->flowi4_l3mdev = l3mdev_master_upper_ifindex_by_index_rcu(net, oif); |
| /* Legacy VRF/l3mdev use case */ |
| fl4->flowi4_oif = fl4->flowi4_l3mdev ? 0 : 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; |
| fl4->flowi4_flags = flow_flags; |
| } |
| |
| 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, |
| struct list_head *dev_to_kill); |
| |
| 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_siocdevprivate(struct net_device *dev, struct ifreq *ifr, |
| void __user *data, 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); |
| |
| void ip_tunnel_md_udp_encap(struct sk_buff *skb, struct ip_tunnel_info *info); |
| 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); |
| |
| bool ip_tunnel_netlink_encap_parms(struct nlattr *data[], |
| struct ip_tunnel_encap *encap); |
| |
| void ip_tunnel_netlink_parms(struct nlattr *data[], |
| struct ip_tunnel_parm *parms); |
| |
| 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_encap *e, |
| u8 *protocol, struct flowi4 *fl4) |
| { |
| const struct ip_tunnel_encap_ops *ops; |
| int ret = -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->build_header)) |
| ret = ops->build_header(skb, e, 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) |
| { |
| __be16 payload_protocol = skb_protocol(skb, true); |
| |
| if (payload_protocol == htons(ETH_P_IP)) |
| return iph->tos; |
| else if (payload_protocol == htons(ETH_P_IPV6)) |
| return ipv6_get_dsfield((const struct ipv6hdr *)iph); |
| else |
| return 0; |
| } |
| |
| static inline __be32 ip_tunnel_get_flowlabel(const struct iphdr *iph, |
| const struct sk_buff *skb) |
| { |
| __be16 payload_protocol = skb_protocol(skb, true); |
| |
| if (payload_protocol == htons(ETH_P_IPV6)) |
| return ip6_flowlabel((const struct ipv6hdr *)iph); |
| else |
| return 0; |
| } |
| |
| static inline u8 ip_tunnel_get_ttl(const struct iphdr *iph, |
| const struct sk_buff *skb) |
| { |
| __be16 payload_protocol = skb_protocol(skb, true); |
| |
| if (payload_protocol == htons(ETH_P_IP)) |
| return iph->ttl; |
| else if (payload_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); |
| u64_stats_add(&tstats->tx_bytes, pkt_len); |
| u64_stats_inc(&tstats->tx_packets); |
| u64_stats_update_end(&tstats->syncp); |
| put_cpu_ptr(tstats); |
| return; |
| } |
| |
| if (pkt_len < 0) { |
| DEV_STATS_INC(dev, tx_errors); |
| DEV_STATS_INC(dev, tx_aborted_errors); |
| } else { |
| DEV_STATS_INC(dev, tx_dropped); |
| } |
| } |
| |
| 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 */ |