15122464d5
Add two helper functions, one for IPv4 and one for IPv6, to recognize the ICMP packets which are error responses. This packets are special because they have as payload the original header of the packet which generated it (RFC 792 says at least 8 bytes, but Linux actually includes much more than that). Signed-off-by: Matteo Croce <mcroce@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
64 lines
1.5 KiB
C
64 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_ICMPV6_H
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#define _LINUX_ICMPV6_H
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#include <linux/skbuff.h>
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#include <uapi/linux/icmpv6.h>
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static inline struct icmp6hdr *icmp6_hdr(const struct sk_buff *skb)
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{
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return (struct icmp6hdr *)skb_transport_header(skb);
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}
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#include <linux/netdevice.h>
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#if IS_ENABLED(CONFIG_IPV6)
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extern void icmpv6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info);
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typedef void ip6_icmp_send_t(struct sk_buff *skb, u8 type, u8 code, __u32 info,
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const struct in6_addr *force_saddr);
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extern int inet6_register_icmp_sender(ip6_icmp_send_t *fn);
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extern int inet6_unregister_icmp_sender(ip6_icmp_send_t *fn);
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int ip6_err_gen_icmpv6_unreach(struct sk_buff *skb, int nhs, int type,
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unsigned int data_len);
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#else
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static inline void icmpv6_send(struct sk_buff *skb,
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u8 type, u8 code, __u32 info)
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{
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}
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#endif
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extern int icmpv6_init(void);
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extern int icmpv6_err_convert(u8 type, u8 code,
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int *err);
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extern void icmpv6_cleanup(void);
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extern void icmpv6_param_prob(struct sk_buff *skb,
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u8 code, int pos);
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struct flowi6;
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struct in6_addr;
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extern void icmpv6_flow_init(struct sock *sk,
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struct flowi6 *fl6,
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u8 type,
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const struct in6_addr *saddr,
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const struct in6_addr *daddr,
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int oif);
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static inline bool icmpv6_is_err(int type)
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{
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switch (type) {
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case ICMPV6_DEST_UNREACH:
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case ICMPV6_PKT_TOOBIG:
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case ICMPV6_TIME_EXCEED:
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case ICMPV6_PARAMPROB:
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return true;
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}
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return false;
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}
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#endif
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