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0d3c4a4416
__icmp_send() is used to generate ICMP error messages in response to
various situations such as MTU errors (i.e., "Fragmentation Required")
and too many hops (i.e., "Time Exceeded").
The skb that generated the error does not necessarily come from the IPv4
layer and does not always have a valid IPv4 control block in skb->cb.
Therefore, commit 9ef6b42ad6 ("net: Add __icmp_send helper.") changed
the function to take the IP options structure as argument instead of
deriving it from the skb's control block. Some callers of this function
such as icmp_send() pass the IP options structure from the skb's control
block as in these call paths the control block is known to be valid, but
other callers simply pass a zeroed structure.
A subsequent patch will need __icmp_send() to access more information
from the IPv4 control block (specifically, the ifindex of the input
interface). As a preparation for this change, change the function to
take the IPv4 control block structure as an argument instead of the IP
options structure. This makes the function similar to its IPv6
counterpart that already takes the IPv6 control block structure as an
argument.
No functional changes intended.
Reviewed-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20250908073238.119240-3-idosch@nvidia.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
65 lines
1.9 KiB
C
65 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* Definitions for the ICMP module.
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*
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* Version: @(#)icmp.h 1.0.4 05/13/93
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*
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* Authors: Ross Biro
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* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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*/
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#ifndef _ICMP_H
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#define _ICMP_H
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#include <linux/icmp.h>
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#include <net/inet_sock.h>
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#include <net/snmp.h>
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#include <net/ip.h>
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struct icmp_err {
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int errno;
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unsigned int fatal:1;
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};
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extern const struct icmp_err icmp_err_convert[];
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#define ICMP_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.icmp_statistics, field)
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#define __ICMP_INC_STATS(net, field) __SNMP_INC_STATS((net)->mib.icmp_statistics, field)
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#define ICMPMSGOUT_INC_STATS(net, field) SNMP_INC_STATS_ATOMIC_LONG((net)->mib.icmpmsg_statistics, field+256)
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#define ICMPMSGIN_INC_STATS(net, field) SNMP_INC_STATS_ATOMIC_LONG((net)->mib.icmpmsg_statistics, field)
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struct dst_entry;
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struct net_proto_family;
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struct sk_buff;
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struct net;
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void __icmp_send(struct sk_buff *skb_in, int type, int code, __be32 info,
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const struct inet_skb_parm *parm);
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static inline void icmp_send(struct sk_buff *skb_in, int type, int code, __be32 info)
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{
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__icmp_send(skb_in, type, code, info, IPCB(skb_in));
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}
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#if IS_ENABLED(CONFIG_NF_NAT)
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void icmp_ndo_send(struct sk_buff *skb_in, int type, int code, __be32 info);
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#else
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static inline void icmp_ndo_send(struct sk_buff *skb_in, int type, int code, __be32 info)
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{
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struct inet_skb_parm parm;
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memset(&parm, 0, sizeof(parm));
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__icmp_send(skb_in, type, code, info, &parm);
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}
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#endif
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int icmp_rcv(struct sk_buff *skb);
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int icmp_err(struct sk_buff *skb, u32 info);
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int icmp_init(void);
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void icmp_out_count(struct net *net, unsigned char type);
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bool icmp_build_probe(struct sk_buff *skb, struct icmphdr *icmphdr);
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#endif /* _ICMP_H */
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