460 lines
12 KiB
C
460 lines
12 KiB
C
#ifndef __NET_IP_TUNNELS_H
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#define __NET_IP_TUNNELS_H 1
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#include <linux/if_tunnel.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/socket.h>
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#include <linux/types.h>
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#include <linux/u64_stats_sync.h>
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#include <linux/bitops.h>
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#include <net/dsfield.h>
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#include <net/gro_cells.h>
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#include <net/inet_ecn.h>
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#include <net/netns/generic.h>
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#include <net/rtnetlink.h>
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#include <net/lwtunnel.h>
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#include <net/dst_cache.h>
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#if IS_ENABLED(CONFIG_IPV6)
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#include <net/ipv6.h>
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#include <net/ip6_fib.h>
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#include <net/ip6_route.h>
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#endif
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/* Keep error state on tunnel for 30 sec */
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#define IPTUNNEL_ERR_TIMEO (30*HZ)
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/* Used to memset ip_tunnel padding. */
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#define IP_TUNNEL_KEY_SIZE offsetofend(struct ip_tunnel_key, tp_dst)
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/* Used to memset ipv4 address padding. */
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#define IP_TUNNEL_KEY_IPV4_PAD offsetofend(struct ip_tunnel_key, u.ipv4.dst)
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#define IP_TUNNEL_KEY_IPV4_PAD_LEN \
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(FIELD_SIZEOF(struct ip_tunnel_key, u) - \
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FIELD_SIZEOF(struct ip_tunnel_key, u.ipv4))
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struct ip_tunnel_key {
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__be64 tun_id;
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union {
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struct {
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__be32 src;
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__be32 dst;
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} ipv4;
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struct {
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struct in6_addr src;
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struct in6_addr dst;
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} ipv6;
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} u;
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__be16 tun_flags;
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u8 tos; /* TOS for IPv4, TC for IPv6 */
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u8 ttl; /* TTL for IPv4, HL for IPv6 */
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__be32 label; /* Flow Label for IPv6 */
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__be16 tp_src;
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__be16 tp_dst;
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};
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/* Flags for ip_tunnel_info mode. */
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#define IP_TUNNEL_INFO_TX 0x01 /* represents tx tunnel parameters */
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#define IP_TUNNEL_INFO_IPV6 0x02 /* key contains IPv6 addresses */
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/* Maximum tunnel options length. */
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#define IP_TUNNEL_OPTS_MAX \
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GENMASK((FIELD_SIZEOF(struct ip_tunnel_info, \
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options_len) * BITS_PER_BYTE) - 1, 0)
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struct ip_tunnel_info {
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struct ip_tunnel_key key;
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#ifdef CONFIG_DST_CACHE
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struct dst_cache dst_cache;
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#endif
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u8 options_len;
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u8 mode;
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};
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/* 6rd prefix/relay information */
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#ifdef CONFIG_IPV6_SIT_6RD
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struct ip_tunnel_6rd_parm {
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struct in6_addr prefix;
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__be32 relay_prefix;
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u16 prefixlen;
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u16 relay_prefixlen;
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};
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#endif
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struct ip_tunnel_encap {
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u16 type;
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u16 flags;
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__be16 sport;
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__be16 dport;
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};
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struct ip_tunnel_prl_entry {
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struct ip_tunnel_prl_entry __rcu *next;
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__be32 addr;
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u16 flags;
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struct rcu_head rcu_head;
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};
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struct metadata_dst;
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struct ip_tunnel {
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struct ip_tunnel __rcu *next;
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struct hlist_node hash_node;
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struct net_device *dev;
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struct net *net; /* netns for packet i/o */
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unsigned long err_time; /* Time when the last ICMP error
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* arrived */
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int err_count; /* Number of arrived ICMP errors */
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/* These four fields used only by GRE */
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u32 i_seqno; /* The last seen seqno */
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u32 o_seqno; /* The last output seqno */
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int tun_hlen; /* Precalculated header length */
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struct dst_cache dst_cache;
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struct ip_tunnel_parm parms;
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int mlink;
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int encap_hlen; /* Encap header length (FOU,GUE) */
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int hlen; /* tun_hlen + encap_hlen */
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struct ip_tunnel_encap encap;
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/* for SIT */
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#ifdef CONFIG_IPV6_SIT_6RD
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struct ip_tunnel_6rd_parm ip6rd;
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#endif
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struct ip_tunnel_prl_entry __rcu *prl; /* potential router list */
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unsigned int prl_count; /* # of entries in PRL */
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int ip_tnl_net_id;
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struct gro_cells gro_cells;
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bool collect_md;
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bool ignore_df;
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};
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#define TUNNEL_CSUM __cpu_to_be16(0x01)
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#define TUNNEL_ROUTING __cpu_to_be16(0x02)
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#define TUNNEL_KEY __cpu_to_be16(0x04)
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#define TUNNEL_SEQ __cpu_to_be16(0x08)
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#define TUNNEL_STRICT __cpu_to_be16(0x10)
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#define TUNNEL_REC __cpu_to_be16(0x20)
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#define TUNNEL_VERSION __cpu_to_be16(0x40)
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#define TUNNEL_NO_KEY __cpu_to_be16(0x80)
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#define TUNNEL_DONT_FRAGMENT __cpu_to_be16(0x0100)
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#define TUNNEL_OAM __cpu_to_be16(0x0200)
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#define TUNNEL_CRIT_OPT __cpu_to_be16(0x0400)
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#define TUNNEL_GENEVE_OPT __cpu_to_be16(0x0800)
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#define TUNNEL_VXLAN_OPT __cpu_to_be16(0x1000)
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#define TUNNEL_NOCACHE __cpu_to_be16(0x2000)
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#define TUNNEL_OPTIONS_PRESENT (TUNNEL_GENEVE_OPT | TUNNEL_VXLAN_OPT)
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struct tnl_ptk_info {
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__be16 flags;
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__be16 proto;
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__be32 key;
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__be32 seq;
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int hdr_len;
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};
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#define PACKET_RCVD 0
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#define PACKET_REJECT 1
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#define PACKET_NEXT 2
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#define IP_TNL_HASH_BITS 7
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#define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS)
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struct ip_tunnel_net {
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struct net_device *fb_tunnel_dev;
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struct hlist_head tunnels[IP_TNL_HASH_SIZE];
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struct ip_tunnel __rcu *collect_md_tun;
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};
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static inline void ip_tunnel_key_init(struct ip_tunnel_key *key,
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__be32 saddr, __be32 daddr,
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u8 tos, u8 ttl, __be32 label,
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__be16 tp_src, __be16 tp_dst,
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__be64 tun_id, __be16 tun_flags)
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{
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key->tun_id = tun_id;
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key->u.ipv4.src = saddr;
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key->u.ipv4.dst = daddr;
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memset((unsigned char *)key + IP_TUNNEL_KEY_IPV4_PAD,
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0, IP_TUNNEL_KEY_IPV4_PAD_LEN);
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key->tos = tos;
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key->ttl = ttl;
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key->label = label;
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key->tun_flags = tun_flags;
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/* For the tunnel types on the top of IPsec, the tp_src and tp_dst of
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* the upper tunnel are used.
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* E.g: GRE over IPSEC, the tp_src and tp_port are zero.
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*/
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key->tp_src = tp_src;
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key->tp_dst = tp_dst;
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/* Clear struct padding. */
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if (sizeof(*key) != IP_TUNNEL_KEY_SIZE)
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memset((unsigned char *)key + IP_TUNNEL_KEY_SIZE,
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0, sizeof(*key) - IP_TUNNEL_KEY_SIZE);
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}
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static inline bool
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ip_tunnel_dst_cache_usable(const struct sk_buff *skb,
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const struct ip_tunnel_info *info)
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{
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if (skb->mark)
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return false;
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if (!info)
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return true;
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if (info->key.tun_flags & TUNNEL_NOCACHE)
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return false;
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return true;
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}
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static inline unsigned short ip_tunnel_info_af(const struct ip_tunnel_info
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*tun_info)
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{
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return tun_info->mode & IP_TUNNEL_INFO_IPV6 ? AF_INET6 : AF_INET;
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}
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#ifdef CONFIG_INET
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int ip_tunnel_init(struct net_device *dev);
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void ip_tunnel_uninit(struct net_device *dev);
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void ip_tunnel_dellink(struct net_device *dev, struct list_head *head);
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struct net *ip_tunnel_get_link_net(const struct net_device *dev);
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int ip_tunnel_get_iflink(const struct net_device *dev);
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int ip_tunnel_init_net(struct net *net, int ip_tnl_net_id,
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struct rtnl_link_ops *ops, char *devname);
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void ip_tunnel_delete_net(struct ip_tunnel_net *itn, struct rtnl_link_ops *ops);
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void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
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const struct iphdr *tnl_params, const u8 protocol);
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int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd);
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int __ip_tunnel_change_mtu(struct net_device *dev, int new_mtu, bool strict);
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int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu);
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struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev,
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struct rtnl_link_stats64 *tot);
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struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn,
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int link, __be16 flags,
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__be32 remote, __be32 local,
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__be32 key);
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int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb,
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const struct tnl_ptk_info *tpi, struct metadata_dst *tun_dst,
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bool log_ecn_error);
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int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[],
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struct ip_tunnel_parm *p);
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int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[],
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struct ip_tunnel_parm *p);
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void ip_tunnel_setup(struct net_device *dev, int net_id);
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struct ip_tunnel_encap_ops {
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size_t (*encap_hlen)(struct ip_tunnel_encap *e);
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int (*build_header)(struct sk_buff *skb, struct ip_tunnel_encap *e,
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u8 *protocol, struct flowi4 *fl4);
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};
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#define MAX_IPTUN_ENCAP_OPS 8
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extern const struct ip_tunnel_encap_ops __rcu *
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iptun_encaps[MAX_IPTUN_ENCAP_OPS];
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int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *op,
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unsigned int num);
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int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *op,
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unsigned int num);
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int ip_tunnel_encap_setup(struct ip_tunnel *t,
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struct ip_tunnel_encap *ipencap);
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static inline int ip_encap_hlen(struct ip_tunnel_encap *e)
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{
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const struct ip_tunnel_encap_ops *ops;
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int hlen = -EINVAL;
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if (e->type == TUNNEL_ENCAP_NONE)
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return 0;
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if (e->type >= MAX_IPTUN_ENCAP_OPS)
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return -EINVAL;
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rcu_read_lock();
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ops = rcu_dereference(iptun_encaps[e->type]);
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if (likely(ops && ops->encap_hlen))
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hlen = ops->encap_hlen(e);
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rcu_read_unlock();
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return hlen;
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}
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static inline int ip_tunnel_encap(struct sk_buff *skb, struct ip_tunnel *t,
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u8 *protocol, struct flowi4 *fl4)
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{
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const struct ip_tunnel_encap_ops *ops;
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int ret = -EINVAL;
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if (t->encap.type == TUNNEL_ENCAP_NONE)
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return 0;
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if (t->encap.type >= MAX_IPTUN_ENCAP_OPS)
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return -EINVAL;
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rcu_read_lock();
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ops = rcu_dereference(iptun_encaps[t->encap.type]);
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if (likely(ops && ops->build_header))
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ret = ops->build_header(skb, &t->encap, protocol, fl4);
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rcu_read_unlock();
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return ret;
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}
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/* Extract dsfield from inner protocol */
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static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph,
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const struct sk_buff *skb)
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{
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if (skb->protocol == htons(ETH_P_IP))
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return iph->tos;
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else if (skb->protocol == htons(ETH_P_IPV6))
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return ipv6_get_dsfield((const struct ipv6hdr *)iph);
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else
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return 0;
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}
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/* Propogate ECN bits out */
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static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph,
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const struct sk_buff *skb)
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{
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u8 inner = ip_tunnel_get_dsfield(iph, skb);
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return INET_ECN_encapsulate(tos, inner);
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}
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int __iptunnel_pull_header(struct sk_buff *skb, int hdr_len,
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__be16 inner_proto, bool raw_proto, bool xnet);
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static inline int iptunnel_pull_header(struct sk_buff *skb, int hdr_len,
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__be16 inner_proto, bool xnet)
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{
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return __iptunnel_pull_header(skb, hdr_len, inner_proto, false, xnet);
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}
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void iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb,
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__be32 src, __be32 dst, u8 proto,
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u8 tos, u8 ttl, __be16 df, bool xnet);
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struct metadata_dst *iptunnel_metadata_reply(struct metadata_dst *md,
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gfp_t flags);
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int iptunnel_handle_offloads(struct sk_buff *skb, int gso_type_mask);
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static inline int iptunnel_pull_offloads(struct sk_buff *skb)
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{
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if (skb_is_gso(skb)) {
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int err;
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err = skb_unclone(skb, GFP_ATOMIC);
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if (unlikely(err))
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return err;
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skb_shinfo(skb)->gso_type &= ~(NETIF_F_GSO_ENCAP_ALL >>
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NETIF_F_GSO_SHIFT);
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}
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skb->encapsulation = 0;
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return 0;
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}
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static inline void iptunnel_xmit_stats(struct net_device *dev, int pkt_len)
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{
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if (pkt_len > 0) {
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struct pcpu_sw_netstats *tstats = get_cpu_ptr(dev->tstats);
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u64_stats_update_begin(&tstats->syncp);
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tstats->tx_bytes += pkt_len;
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tstats->tx_packets++;
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u64_stats_update_end(&tstats->syncp);
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put_cpu_ptr(tstats);
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} else {
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struct net_device_stats *err_stats = &dev->stats;
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if (pkt_len < 0) {
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err_stats->tx_errors++;
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err_stats->tx_aborted_errors++;
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} else {
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err_stats->tx_dropped++;
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}
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}
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}
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static inline void *ip_tunnel_info_opts(struct ip_tunnel_info *info)
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{
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return info + 1;
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}
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static inline void ip_tunnel_info_opts_get(void *to,
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const struct ip_tunnel_info *info)
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{
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memcpy(to, info + 1, info->options_len);
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}
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static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info,
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const void *from, int len)
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{
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memcpy(ip_tunnel_info_opts(info), from, len);
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info->options_len = len;
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}
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static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate)
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{
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return (struct ip_tunnel_info *)lwtstate->data;
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}
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extern struct static_key ip_tunnel_metadata_cnt;
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/* Returns > 0 if metadata should be collected */
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static inline int ip_tunnel_collect_metadata(void)
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{
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return static_key_false(&ip_tunnel_metadata_cnt);
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}
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void __init ip_tunnel_core_init(void);
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void ip_tunnel_need_metadata(void);
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void ip_tunnel_unneed_metadata(void);
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#else /* CONFIG_INET */
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static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state *lwtstate)
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{
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return NULL;
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}
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static inline void ip_tunnel_need_metadata(void)
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{
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}
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static inline void ip_tunnel_unneed_metadata(void)
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{
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}
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static inline void ip_tunnel_info_opts_get(void *to,
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const struct ip_tunnel_info *info)
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{
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}
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static inline void ip_tunnel_info_opts_set(struct ip_tunnel_info *info,
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const void *from, int len)
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{
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info->options_len = 0;
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}
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#endif /* CONFIG_INET */
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#endif /* __NET_IP_TUNNELS_H */
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