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| author | Stefano Brivio <sbrivio@redhat.com> | 2021-05-21 11:14:53 +0200 |
|---|---|---|
| committer | Stefano Brivio <sbrivio@redhat.com> | 2021-05-21 11:14:53 +0200 |
| commit | 9311ceb8b6fe7064cffca3efda051ef1e1801642 (patch) | |
| tree | 6ffceb50e313b00305eedfb53341ed37a484b5fd /icmp.c | |
| parent | 5fd6db7751c4fd20a4a2415fdda8b09b5ce524f9 (diff) | |
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icmp: Implement lazy bind for ping sockets
It turns out that binding ICMP/ICMPv6 echo sockets takes a long
time. Instead of binding all of them (one for each possible echo
identification number, that is, 2^17) at start-up, bind them as
ICMP/ICMPv6 packets are sent by the guest.
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Diffstat (limited to 'icmp.c')
| -rw-r--r-- | icmp.c | 12 |
1 files changed, 10 insertions, 2 deletions
@@ -105,7 +105,8 @@ int icmp_tap_handler(struct ctx *c, int af, void *addr, struct icmphdr *ih = (struct icmphdr *)msg[0].l4h; struct sockaddr_in sa = { .sin_family = AF_INET, - .sin_addr = *(struct in_addr *)addr, + .sin_addr = { .s_addr = INADDR_ANY }, + .sin_port = ih->un.echo.id, }; if (msg[0].l4_len < sizeof(*ih) || ih->type != ICMP_ECHO) @@ -114,6 +115,9 @@ int icmp_tap_handler(struct ctx *c, int af, void *addr, if ((s = icmp_s_v4[ntohs(ih->un.echo.id)]) < 0) return 1; + bind(s, (struct sockaddr *)&sa, sizeof(sa)); + + sa.sin_addr = *(struct in_addr *)addr; sendto(s, msg[0].l4h, msg[0].l4_len, MSG_DONTWAIT | MSG_NOSIGNAL, (struct sockaddr *)&sa, sizeof(sa)); @@ -121,7 +125,8 @@ int icmp_tap_handler(struct ctx *c, int af, void *addr, struct icmp6hdr *ih = (struct icmp6hdr *)msg[0].l4h; struct sockaddr_in6 sa = { .sin6_family = AF_INET6, - .sin6_addr = *(struct in6_addr *)addr, + .sin6_addr = IN6ADDR_ANY_INIT, + .sin6_port = ih->icmp6_identifier, }; if (msg[0].l4_len < sizeof(*ih) || @@ -131,6 +136,9 @@ int icmp_tap_handler(struct ctx *c, int af, void *addr, if ((s = icmp_s_v6[ntohs(ih->icmp6_identifier)]) < 0) return 1; + bind(s, (struct sockaddr *)&sa, sizeof(sa)); + + sa.sin6_addr = *(struct in6_addr *)addr; sendto(s, msg[0].l4h, msg[0].l4_len, MSG_DONTWAIT | MSG_NOSIGNAL, (struct sockaddr *)&sa, sizeof(sa)); |