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passt: Introduce ICMP echo proxy

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It's nice to be able to confirm connectivity using ICMP or ICMPv6
echo requests, and "ping" sockets on Linux (IPPROTO_ICMP datagram)
allow us to do that without any special capability.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Stefano Brivio 2021-03-17 10:57:44 +01:00
parent d32edee60a
commit 1d807fc720
7 changed files with 183 additions and 11 deletions

24
passt.c
View file

@ -46,6 +46,7 @@
#include "dhcp.h"
#include "ndp.h"
#include "util.h"
#include "icmp.h"
#include "tcp.h"
#include "udp.h"
@ -335,6 +336,8 @@ static void tap4_handler(struct ctx *c, char *in, size_t len)
tcp_tap_handler(c, AF_INET, &iph->daddr, l4h, len);
else if (iph->protocol == IPPROTO_UDP)
udp_tap_handler(c, AF_INET, &iph->daddr, l4h, len);
else if (iph->protocol == IPPROTO_ICMP)
icmp_tap_handler(c, AF_INET, &iph->daddr, l4h, len);
}
/**
@ -391,6 +394,8 @@ static void tap6_handler(struct ctx *c, char *in, size_t len)
tcp_tap_handler(c, AF_INET6, &ip6h->daddr, l4h, len);
else if (proto == IPPROTO_UDP)
udp_tap_handler(c, AF_INET6, &ip6h->daddr, l4h, len);
else if (proto == IPPROTO_ICMPV6)
icmp_tap_handler(c, AF_INET6, &ip6h->daddr, l4h, len);
}
/**
@ -449,15 +454,18 @@ static void sock_handler(struct ctx *c, int fd, uint32_t events)
sl = sizeof(so);
if (getsockopt(fd, SOL_SOCKET, SO_TYPE, &so, &sl) ||
so == SOCK_STREAM) {
fprintf(stderr, "TCP: packet from socket %i\n", fd);
if (getsockopt(fd, SOL_SOCKET, SO_PROTOCOL, &so, &sl))
return;
fprintf(stderr, "%s: packet from socket %i\n",
getprotobynumber(so)->p_name, fd);
if (so == IPPROTO_ICMP || so == IPPROTO_ICMPV6)
icmp_sock_handler(c, fd, events);
else if (so == IPPROTO_TCP)
tcp_sock_handler(c, fd, events);
}
else if (so == SOCK_DGRAM) {
else if (so == IPPROTO_UDP)
udp_sock_handler(c, fd, events);
fprintf(stderr, "UDP: packet from socket %i\n", fd);
}
}
/**
@ -546,7 +554,7 @@ int main(int argc, char **argv)
exit(EXIT_FAILURE);
}
if (tcp_sock_init(&c) || udp_sock_init(&c))
if (icmp_sock_init(&c) || tcp_sock_init(&c) || udp_sock_init(&c))
exit(EXIT_FAILURE);
fd_unix = sock_unix();