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#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
Outgoing packets automatically have an IP header prepended to them (based on the destination address). Incoming packets are received with the IP header and options intact.
Num | Abbrev. | Description |
0 | echorep | Echo reply |
3 | unreach | Destination unreachable |
4 | squench | Packet loss, slow down |
5 | redir | Shorter route exists |
6 | althost | Alternate host address |
8 | echoreq | Echo request |
9 | routeradv | Router advertisement |
10 | routersol | Router solicitation |
11 | timex | Time exceeded |
12 | paramprob | Invalid IP header |
13 | timereq | Timestamp request |
14 | timerep | Timestamp reply |
15 | inforeq | Information request |
16 | inforep | Information reply |
17 | maskreq | Address mask request |
18 | maskrep | Address mask reply |
30 | trace | Traceroute |
31 | dataconv | Data conversion problem |
32 | mobredir | Mobile host redirection |
33 | ipv6-where | IPv6 where-are-you |
34 | ipv6-here | IPv6 i-am-here |
35 | mobregreq | Mobile registration request |
36 | mobregrep | Mobile registration reply |
39 | skip | SKIP |
40 | photuris | Photuris |
The following codes are defined:
Num | Abbrev. | Type | Description |
0 | net-unr | unreach | Network unreachable |
1 | host-unr | unreach | Host unreachable |
2 | proto-unr | unreach | Protocol unreachable |
3 | port-unr | unreach | Port unreachable |
4 | needfrag | unreach | Fragmentation needed but DF bit set |
5 | srcfail | unreach | Source routing failed |
6 | net-unk | unreach | Network unknown |
7 | host-unk | unreach | Host unknown |
8 | isolate | unreach | Host isolated |
9 | net-prohib | unreach | Network administratively prohibited |
10 | host-prohib | unreach | Host administratively prohibited |
11 | net-tos | unreach | Invalid TOS for network |
12 | host-tos | unreach | Invalid TOS for host |
13 | filter-prohib | unreach | Prohibited access |
14 | host-preced | unreach | Precedence violation |
15 | cutoff-preced | unreach | Precedence cutoff |
0 | redir-net | redir | Shorter route for network |
1 | redir-host | redir | Shorter route for host |
2 | redir-tos-net | redir | Shorter route for TOS and network |
3 | redir-tos-host | redir | Shorter route for TOS and host |
0 | normal-adv | routeradv | Normal advertisement |
16 | common-adv | routeradv | Selective advertisement |
0 | transit | timex | Time exceeded in transit |
1 | reassemb | timex | Time exceeded in reassembly |
0 | badhead | paramprob | Invalid option pointer |
1 | optmiss | paramprob | Missing option |
2 | badlen | paramprob | Invalid length |
1 | unknown-ind | photuris | Unknown security index |
2 | auth-fail | photuris | Authentication failed |
3 | decrypt-fail | photuris | Decryption failed |
maskrepl | |
(boolean) Enable/disable replies to ICMP Address Mask Request packets. Defaults to false. | |
maskfake | |
(unsigned integer) When maskrepl is set and this value is non-zero, it will be used instead of the real address mask when the system replies to an ICMP Address Mask Request packet. Defaults to 0. | |
icmplim | |
(integer) Bandwidth limit for ICMP replies in packets/second. If set to zero, no limiting will occur. Defaults to 200. | |
icmplim_output | |
(boolean) Enable/disable logging of ICMP replies bandwidth limiting. Defaults to true. | |
drop_redirect | |
(boolean) Enable/disable dropping of ICMP Redirect packets. Defaults to false. | |
log_redirect | |
(boolean) Enable/disable logging of ICMP Redirect packets. Defaults to false. | |
bmcastecho | |
(boolean) Enable/disable ICMP replies received via broadcast or multicast. Defaults to false. | |
reply_src | |
(str) An interface name used for the ICMP reply source in response to packets which are not directly addressed to us. By default continue with normal source selection. | |
reply_from_interface | |
(boolean) Use the IP address of the interface the packet came through in for responses to packets which are not directly addressed to us. If enabled, this rule is processed before all others. By default, continue with normal source selection. Enabling this option is particularly useful on routers because it makes external traceroutes show the actual path a packet has taken instead of the possibly different return path. | |
quotelen | |
(integer) Number of bytes from original packet to quote in ICMP reply. This number is internally enforced to be at least 8 bytes (per RFC792) and at most the maximal space left in the ICMP reply mbuf. | |
tstamprepl | |
(boolean) Enable/disable replies to ICMP Timestamp packets. Defaults to true. | |
[EISCONN] | |
when trying to establish a connection on a socket which already has one, or when trying to send a datagram with the destination address specified and the socket is already connected; | |
[ENOTCONN] | |
when trying to send a datagram, but no destination address is specified, and the socket has not been connected; | |
[ENOBUFS] | |
when the system runs out of memory for an internal data structure; | |
[EADDRNOTAVAIL] | |
when an attempt is made to create a socket with a network address for which no network interface exists. | |
ICMP (4) | March 26, 2015 |
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