d3b6f61418
If CONFIG_NET_NS is not set then __net_init is the same as __init and
__net_exit is the same as __exit. These functions will be removed from
memory after the module loads or is removed. Functions that are exported
for use by other functions should never be labeled for removal.
Bug introduced by commit c544193214
("GRE: Refactor GRE tunneling code.")
Reported-by: Steinar H. Gunderson <sgunderson@bigfoot.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
178 lines
4.8 KiB
C
178 lines
4.8 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/types.h>
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#include <linux/u64_stats_sync.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/ip.h>
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#include <net/rtnetlink.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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/* 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_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 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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int err_count; /* Number of arrived ICMP errors */
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unsigned long err_time; /* Time when the last ICMP error
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* arrived */
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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 hlen; /* Precalculated header length */
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int mlink;
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struct ip_tunnel_parm parms;
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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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};
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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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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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};
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#define PACKET_RCVD 0
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#define PACKET_REJECT 1
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#define IP_TNL_HASH_BITS 10
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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 hlist_head *tunnels;
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struct net_device *fb_tunnel_dev;
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};
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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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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);
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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);
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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);
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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, 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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/* 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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static inline void tunnel_ip_select_ident(struct sk_buff *skb,
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const struct iphdr *old_iph,
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struct dst_entry *dst)
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{
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struct iphdr *iph = ip_hdr(skb);
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/* Use inner packet iph-id if possible. */
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if (skb->protocol == htons(ETH_P_IP) && old_iph->id)
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iph->id = old_iph->id;
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else
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__ip_select_ident(iph, dst,
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(skb_shinfo(skb)->gso_segs ?: 1) - 1);
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}
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static inline void iptunnel_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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int err;
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int pkt_len = skb->len - skb_transport_offset(skb);
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struct pcpu_tstats *tstats = this_cpu_ptr(dev->tstats);
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nf_reset(skb);
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err = ip_local_out(skb);
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if (likely(net_xmit_eval(err) == 0)) {
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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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} else {
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dev->stats.tx_errors++;
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dev->stats.tx_aborted_errors++;
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}
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}
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#endif /* __NET_IP_TUNNELS_H */
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