diff options
| author | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2021-06-07 00:04:23 +0200 |
|---|---|---|
| committer | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2021-06-07 00:04:25 +0200 |
| commit | 3704690e191df79818a38da964cb673a802b8e9e (patch) | |
| tree | c96802027f20e1a73f00894f8a004a548fb5c542 | |
| parent | 8c621ee887b41f1815f435491fd7bea63c2b8d6c (diff) | |
| download | slirp-3704690e191df79818a38da964cb673a802b8e9e.zip slirp-3704690e191df79818a38da964cb673a802b8e9e.tar.gz slirp-3704690e191df79818a38da964cb673a802b8e9e.tar.bz2 | |
icmp: Document the use of UDP echo service
Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
| -rw-r--r-- | src/ip_icmp.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/src/ip_icmp.c b/src/ip_icmp.c index 5ffadd6..9917f36 100644 --- a/src/ip_icmp.c +++ b/src/ip_icmp.c @@ -185,8 +185,13 @@ void icmp_input(struct mbuf *m, int hlen) so = socreate(slirp); if (icmp_send(so, m, hlen) == 0) { + /* We could send this as ICMP, good! */ return; } + + /* We could not send this as ICMP, try to send it on UDP echo + * service (7), wishfully hoping that it is open there. */ + if (udp_attach(so, AF_INET) == -1) { DEBUG_MISC("icmp_input udp_attach errno = %d-%s", errno, strerror(errno)); |