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-rw-r--r--include/net/ip_tunnels.h538
1 files changed, 538 insertions, 0 deletions
diff --git a/include/net/ip_tunnels.h b/include/net/ip_tunnels.h
new file mode 100644
index 000000000..58d8e6260
--- /dev/null
+++ b/include/net/ip_tunnels.h
@@ -0,0 +1,538 @@
+/* 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 */
+ 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, 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);
+
+void ip_tunnel_get_stats64(struct net_device *dev,
+ struct rtnl_link_stats64 *tot);
+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)
+{
+ __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 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);
+ tstats->tx_bytes += pkt_len;
+ 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(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 */
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-10 21:21:27 +0000