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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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#include <net/dst.h>#include <net/inetpeer.h>#include <net/flow.h>#include <net/inet_sock.h>#include <net/ip_fib.h>#include <net/arp.h>#include <net/ndisc.h>#include <net/inet_dscp.h>#include <net/sock.h>#include <linux/in_route.h>#include <linux/rtnetlink.h>#include <linux/rcupdate.h>#include <linux/route.h>#include <linux/ip.h>#include <linux/cache.h>#include <linux/security.h>
static inline __u8 ip_sock_rt_scope(const struct sock *sk){ if (sock_flag(sk, SOCK_LOCALROUTE)) return RT_SCOPE_LINK;
return RT_SCOPE_UNIVERSE;}
static inline __u8 ip_sock_rt_tos(const struct sock *sk){ return READ_ONCE(inet_sk(sk)->tos) & INET_DSCP_MASK;}
struct ip_tunnel_info;struct fib_nh;struct fib_info;struct uncached_list;struct rtable { struct dst_entry dst;
int rt_genid; unsigned int rt_flags; __u16 rt_type; __u8 rt_is_input; __u8 rt_uses_gateway;
int rt_iif;
u8 rt_gw_family; /* Info on neighbour */ union { __be32 rt_gw4; struct in6_addr rt_gw6; };
/* Miscellaneous cached information */ u32 rt_mtu_locked:1, rt_pmtu:31;};
#define dst_rtable(_ptr) container_of_const(_ptr, struct rtable, dst)
/** * skb_rtable - Returns the skb &rtable * @skb: buffer */static inline struct rtable *skb_rtable(const struct sk_buff *skb){ return dst_rtable(skb_dst(skb));}
static inline bool rt_is_input_route(const struct rtable *rt){ return rt->rt_is_input != 0;}
static inline bool rt_is_output_route(const struct rtable *rt){ return rt->rt_is_input == 0;}
static inline __be32 rt_nexthop(const struct rtable *rt, __be32 daddr){ if (rt->rt_gw_family == AF_INET) return rt->rt_gw4; return daddr;}
struct ip_rt_acct { __u32 o_bytes; __u32 o_packets; __u32 i_bytes; __u32 i_packets;};
struct rt_cache_stat { unsigned int in_slow_tot; unsigned int in_slow_mc; unsigned int in_no_route; unsigned int in_brd; unsigned int in_martian_dst; unsigned int in_martian_src; unsigned int out_slow_tot; unsigned int out_slow_mc;};
extern struct ip_rt_acct __percpu *ip_rt_acct;
struct in_device;
int ip_rt_init(void);void rt_cache_flush(struct net *net);#ifdef CONFIG_INETvoid rt_flush_dev(struct net_device *dev);#elsestatic inline void rt_flush_dev(struct net_device *dev){}#endif
static inline void inet_sk_init_flowi4(const struct inet_sock *inet, struct flowi4 *fl4){ const struct ip_options_rcu *ip4_opt; const struct sock *sk; __be32 daddr;
rcu_read_lock(); ip4_opt = rcu_dereference(inet->inet_opt);
/* Source routing option overrides the socket destination address */ if (ip4_opt && ip4_opt->opt.srr) daddr = ip4_opt->opt.faddr; else daddr = inet->inet_daddr; rcu_read_unlock();
sk = &inet->sk; flowi4_init_output(fl4, sk->sk_bound_dev_if, READ_ONCE(sk->sk_mark), ip_sock_rt_tos(sk), ip_sock_rt_scope(sk), sk->sk_protocol, inet_sk_flowi_flags(sk), daddr, inet->inet_saddr, inet->inet_dport, inet->inet_sport, sk_uid(sk)); security_sk_classify_flow(sk, flowi4_to_flowi_common(fl4));}
struct rtable *ip_route_output_key_hash(struct net *net, struct flowi4 *flp, const struct sk_buff *skb);struct rtable *ip_route_output_key_hash_rcu(struct net *net, struct flowi4 *flp, struct fib_result *res, const struct sk_buff *skb);
static inline struct rtable *__ip_route_output_key(struct net *net, struct flowi4 *flp){ return ip_route_output_key_hash(net, flp, NULL);}
struct rtable *ip_route_output_flow(struct net *, struct flowi4 *flp, const struct sock *sk);struct dst_entry *ipv4_blackhole_route(struct net *net, struct dst_entry *dst_orig);
static inline struct rtable *ip_route_output_key(struct net *net, struct flowi4 *flp){ return ip_route_output_flow(net, flp, NULL);}
/* Simplistic IPv4 route lookup function. * This is only suitable for some particular use cases: since the flowi4 * structure is only partially set, it may bypass some fib-rules. */static inline struct rtable *ip_route_output(struct net *net, __be32 daddr, __be32 saddr, dscp_t dscp, int oif, __u8 scope){ struct flowi4 fl4 = { .flowi4_oif = oif, .flowi4_dscp = dscp, .flowi4_scope = scope, .daddr = daddr, .saddr = saddr, };
return ip_route_output_key(net, &fl4);}
static inline struct rtable *ip_route_output_ports(struct net *net, struct flowi4 *fl4, const struct sock *sk, __be32 daddr, __be32 saddr, __be16 dport, __be16 sport, __u8 proto, __u8 tos, int oif){ flowi4_init_output(fl4, oif, sk ? READ_ONCE(sk->sk_mark) : 0, tos, sk ? ip_sock_rt_scope(sk) : RT_SCOPE_UNIVERSE, proto, sk ? inet_sk_flowi_flags(sk) : 0, daddr, saddr, dport, sport, sock_net_uid(net, sk)); if (sk) security_sk_classify_flow(sk, flowi4_to_flowi_common(fl4)); return ip_route_output_flow(net, fl4, sk);}
enum skb_drop_reasonip_mc_validate_source(struct sk_buff *skb, __be32 daddr, __be32 saddr, dscp_t dscp, struct net_device *dev, struct in_device *in_dev, u32 *itag);enum skb_drop_reasonip_route_input_noref(struct sk_buff *skb, __be32 daddr, __be32 saddr, dscp_t dscp, struct net_device *dev);enum skb_drop_reasonip_route_use_hint(struct sk_buff *skb, __be32 daddr, __be32 saddr, dscp_t dscp, struct net_device *dev, const struct sk_buff *hint);
static inline enum skb_drop_reasonip_route_input(struct sk_buff *skb, __be32 dst, __be32 src, dscp_t dscp, struct net_device *devin){ enum skb_drop_reason reason;
rcu_read_lock(); reason = ip_route_input_noref(skb, dst, src, dscp, devin); if (!reason) { skb_dst_force(skb); if (!skb_dst(skb)) reason = SKB_DROP_REASON_NOT_SPECIFIED; } rcu_read_unlock();
return reason;}
void ipv4_update_pmtu(struct sk_buff *skb, struct net *net, u32 mtu, int oif, u8 protocol);void ipv4_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, u32 mtu);void ipv4_redirect(struct sk_buff *skb, struct net *net, int oif, u8 protocol);void ipv4_sk_redirect(struct sk_buff *skb, struct sock *sk);void ip_rt_send_redirect(struct sk_buff *skb);
unsigned int inet_addr_type(struct net *net, __be32 addr);unsigned int inet_addr_type_table(struct net *net, __be32 addr, u32 tb_id);unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev, __be32 addr);unsigned int inet_addr_type_dev_table(struct net *net, const struct net_device *dev, __be32 addr);void ip_rt_multicast_event(struct in_device *);int ip_rt_ioctl(struct net *, unsigned int cmd, struct rtentry *rt);void ip_rt_get_source(u8 *src, struct sk_buff *skb, struct rtable *rt);struct rtable *rt_dst_alloc(struct net_device *dev, unsigned int flags, u16 type, bool noxfrm);struct rtable *rt_dst_clone(struct net_device *dev, struct rtable *rt);
struct in_ifaddr;void fib_add_ifaddr(struct in_ifaddr *);void fib_del_ifaddr(struct in_ifaddr *, struct in_ifaddr *);void fib_modify_prefix_metric(struct in_ifaddr *ifa, u32 new_metric);
void rt_add_uncached_list(struct rtable *rt);void rt_del_uncached_list(struct rtable *rt);
int fib_dump_info_fnhe(struct sk_buff *skb, struct netlink_callback *cb, u32 table_id, struct fib_info *fi, int *fa_index, int fa_start, unsigned int flags);
void fnhe_update_pmtu(struct fib_nh_exception *fnhe, u32 new, u32 orig);
static inline void ip_rt_put(struct rtable *rt){ /* dst_release() accepts a NULL parameter. * We rely on dst being first structure in struct rtable */ BUILD_BUG_ON(offsetof(struct rtable, dst) != 0); dst_release(&rt->dst);}
extern const __u8 ip_tos2prio[16];
static inline char rt_tos2priority(u8 tos){ return ip_tos2prio[IPTOS_TOS(tos)>>1];}
/* ip_route_connect() and ip_route_newports() work in tandem whilst * binding a socket for a new outgoing connection. * * In order to use IPSEC properly, we must, in the end, have a * route that was looked up using all available keys including source * and destination ports. * * However, if a source port needs to be allocated (the user specified * a wildcard source port) we need to obtain addressing information * in order to perform that allocation. * * So ip_route_connect() looks up a route using wildcarded source and * destination ports in the key, simply so that we can get a pair of * addresses to use for port allocation. * * Later, once the ports are allocated, ip_route_newports() will make * another route lookup if needed to make sure we catch any IPSEC * rules keyed on the port information. * * The callers allocate the flow key on their stack, and must pass in * the same flowi4 object to both the ip_route_connect() and the * ip_route_newports() calls. */
static inline void ip_route_connect_init(struct flowi4 *fl4, __be32 dst, __be32 src, int oif, u8 protocol, __be16 sport, __be16 dport, const struct sock *sk){ __u8 flow_flags = 0;
if (inet_test_bit(TRANSPARENT, sk)) flow_flags |= FLOWI_FLAG_ANYSRC;
if (IS_ENABLED(CONFIG_IP_ROUTE_MULTIPATH) && !sport) flow_flags |= FLOWI_FLAG_ANY_SPORT;
flowi4_init_output(fl4, oif, READ_ONCE(sk->sk_mark), ip_sock_rt_tos(sk), ip_sock_rt_scope(sk), protocol, flow_flags, dst, src, dport, sport, sk_uid(sk));}
static inline struct rtable *ip_route_connect(struct flowi4 *fl4, __be32 dst, __be32 src, int oif, u8 protocol, __be16 sport, __be16 dport, const struct sock *sk){ struct net *net = sock_net(sk); struct rtable *rt;
ip_route_connect_init(fl4, dst, src, oif, protocol, sport, dport, sk);
if (!dst || !src) { rt = __ip_route_output_key(net, fl4); if (IS_ERR(rt)) return rt; ip_rt_put(rt); flowi4_update_output(fl4, oif, fl4->daddr, fl4->saddr); } security_sk_classify_flow(sk, flowi4_to_flowi_common(fl4)); return ip_route_output_flow(net, fl4, sk);}
static inline struct rtable *ip_route_newports(struct flowi4 *fl4, struct rtable *rt, __be16 orig_sport, __be16 orig_dport, __be16 sport, __be16 dport, const struct sock *sk){ if (sport != orig_sport || dport != orig_dport) { fl4->fl4_dport = dport; fl4->fl4_sport = sport; ip_rt_put(rt); flowi4_update_output(fl4, sk->sk_bound_dev_if, fl4->daddr, fl4->saddr); security_sk_classify_flow(sk, flowi4_to_flowi_common(fl4)); return ip_route_output_flow(sock_net(sk), fl4, sk); } return rt;}
static inline int inet_iif(const struct sk_buff *skb){ struct rtable *rt = skb_rtable(skb);
if (rt && rt->rt_iif) return rt->rt_iif;
return skb->skb_iif;}
static inline int ip4_dst_hoplimit(const struct dst_entry *dst){ int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
if (hoplimit == 0) { const struct net *net;
rcu_read_lock(); net = dst_dev_net_rcu(dst); hoplimit = READ_ONCE(net->ipv4.sysctl_ip_default_ttl); rcu_read_unlock(); } return hoplimit;}
static inline struct neighbour *ip_neigh_gw4(struct net_device *dev, __be32 daddr){ struct neighbour *neigh;
neigh = __ipv4_neigh_lookup_noref(dev, (__force u32)daddr); if (unlikely(!neigh)) { struct neigh_table *tbl = arp_table(dev_net(dev));
neigh = __neigh_create(tbl, &daddr, dev, false); }
return neigh;}
static inline struct neighbour *ip_neigh_for_gw(struct rtable *rt, struct sk_buff *skb, bool *is_v6gw){ struct net_device *dev = rt->dst.dev; struct neighbour *neigh;
if (likely(rt->rt_gw_family == AF_INET)) { neigh = ip_neigh_gw4(dev, rt->rt_gw4); } else if (rt->rt_gw_family == AF_INET6) { neigh = ip_neigh_gw6(dev, &rt->rt_gw6); *is_v6gw = true; } else { neigh = ip_neigh_gw4(dev, ip_hdr(skb)->daddr); } return neigh;}
#endif /* _ROUTE_H */