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passt: Run in background, add message logging with severities

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Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Stefano Brivio 2021-03-18 07:49:08 +01:00
parent 8bfcc9208c
commit 48ca38c606
6 changed files with 109 additions and 71 deletions
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10
dhcp.c
View file

@ -198,18 +198,18 @@ int dhcp(struct ctx *c, struct ethhdr *eh, size_t len)
}
if (opts[53].c[0] == DHCPDISCOVER) {
fprintf(stderr, "DHCP: offer to discover");
info("DHCP: offer to discover");
opts[53].s[0] = DHCPOFFER;
} else if (opts[53].c[0] == DHCPREQUEST) {
fprintf(stderr, "DHCP: ack to request");
info("DHCP: ack to request");
opts[53].s[0] = DHCPACK;
} else {
return -1;
}
fprintf(stderr, " from %02x:%02x:%02x:%02x:%02x:%02x\n\n",
m->chaddr[0], m->chaddr[1], m->chaddr[2],
m->chaddr[3], m->chaddr[4], m->chaddr[5]);
info(" from %02x:%02x:%02x:%02x:%02x:%02x",
m->chaddr[0], m->chaddr[1], m->chaddr[2],
m->chaddr[3], m->chaddr[4], m->chaddr[5]);
m->yiaddr = c->addr4;
*(unsigned long *)opts[1].s = c->mask4;

4
ndp.c
View file

@ -61,7 +61,7 @@ int ndp(struct ctx *c, struct ethhdr *eh, size_t len)
ihr = (struct icmp6hdr *)(ip6hr + 1);
if (ih->icmp6_type == NS) {
fprintf(stderr, "NDP: received NS, sending NA\n");
info("NDP: received NS, sending NA");
ihr->icmp6_type = NA;
ihr->icmp6_code = 0;
ihr->icmp6_router = 1;
@ -76,7 +76,7 @@ int ndp(struct ctx *c, struct ethhdr *eh, size_t len)
memcpy(p, c->mac, ETH_ALEN);
p += 6;
} else if (ih->icmp6_type == RS) {
fprintf(stderr, "NDP: received RS, sending RA\n");
info("NDP: received RS, sending RA");
ihr->icmp6_type = RA;
ihr->icmp6_code = 0;
ihr->icmp6_rt_lifetime = htons(3600);

131
passt.c
View file

@ -40,6 +40,7 @@
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <time.h>
#include <syslog.h>
#include "passt.h"
#include "arp.h"
@ -185,7 +186,7 @@ out:
close(s);
if (!(c->v4 || c->v6) || !*c->ifn) {
fprintf(stderr, "No routing information\n");
err("No routing information");
exit(EXIT_FAILURE);
}
}
@ -256,7 +257,7 @@ static void get_addrs(struct ctx *c)
return;
out:
fprintf(stderr, "Couldn't get addresses for routable interface\n");
err("Couldn't get addresses for routable interface");
exit(EXIT_FAILURE);
}
@ -288,7 +289,7 @@ static void get_dns(struct ctx *c)
if (dns4 || dns6)
return;
fprintf(stderr, "Couldn't get any nameserver address\n");
err("Couldn't get any nameserver address");
exit(EXIT_FAILURE);
}
@ -302,7 +303,8 @@ static void tap4_handler(struct ctx *c, char *in, size_t len)
{
struct ethhdr *eh = (struct ethhdr *)in;
struct iphdr *iph = (struct iphdr *)(eh + 1);
char buf_s[BUFSIZ], buf_d[BUFSIZ];
char buf_s[BUFSIZ] __attribute((__unused__));
char buf_d[BUFSIZ] __attribute((__unused__));
char *l4h;
if (arp(c, eh, len) || dhcp(c, eh, len))
@ -315,21 +317,21 @@ static void tap4_handler(struct ctx *c, char *in, size_t len)
len -= (intptr_t)l4h - (intptr_t)eh;
if (iph->protocol == IPPROTO_ICMP) {
fprintf(stderr, "icmp from tap: %s -> %s\n",
inet_ntop(AF_INET, &iph->saddr, buf_s, sizeof(buf_s)),
inet_ntop(AF_INET, &iph->daddr, buf_d, sizeof(buf_d)));
debug("icmp from tap: %s -> %s",
inet_ntop(AF_INET, &iph->saddr, buf_s, sizeof(buf_s)),
inet_ntop(AF_INET, &iph->daddr, buf_d, sizeof(buf_d)));
} else {
struct tcphdr *th = (struct tcphdr *)l4h;
if (len < sizeof(*th) && len < sizeof(struct udphdr))
return;
fprintf(stderr, "%s from tap: %s:%i -> %s:%i\n",
getprotobynumber(iph->protocol)->p_name,
inet_ntop(AF_INET, &iph->saddr, buf_s, sizeof(buf_s)),
ntohs(th->source),
inet_ntop(AF_INET, &iph->daddr, buf_d, sizeof(buf_d)),
ntohs(th->dest));
debug("%s from tap: %s:%i -> %s:%i",
getprotobynumber(iph->protocol)->p_name,
inet_ntop(AF_INET, &iph->saddr, buf_s, sizeof(buf_s)),
ntohs(th->source),
inet_ntop(AF_INET, &iph->daddr, buf_d, sizeof(buf_d)),
ntohs(th->dest));
}
if (iph->protocol == IPPROTO_TCP)
@ -350,7 +352,8 @@ static void tap6_handler(struct ctx *c, char *in, size_t len)
{
struct ethhdr *eh = (struct ethhdr *)in;
struct ipv6hdr *ip6h = (struct ipv6hdr *)(eh + 1);
char buf_s[BUFSIZ], buf_d[BUFSIZ];
char buf_s[BUFSIZ] __attribute((__unused__));
char buf_d[BUFSIZ] __attribute((__unused__));
uint8_t proto;
char *l4h;
@ -371,23 +374,21 @@ static void tap6_handler(struct ctx *c, char *in, size_t len)
len -= (intptr_t)l4h - (intptr_t)eh;
if (proto == IPPROTO_ICMPV6) {
fprintf(stderr, "icmpv6 from tap: %s ->\n\t%s\n",
inet_ntop(AF_INET6, &ip6h->saddr, buf_s, sizeof(buf_s)),
inet_ntop(AF_INET6, &ip6h->daddr, buf_d, sizeof(buf_d))
);
debug("icmpv6 from tap: %s ->\n\t%s",
inet_ntop(AF_INET6, &ip6h->saddr, buf_s, sizeof(buf_s)),
inet_ntop(AF_INET6, &ip6h->daddr, buf_d, sizeof(buf_d)));
} else {
struct tcphdr *th = (struct tcphdr *)l4h;
if (len < sizeof(*th) && len < sizeof(struct udphdr))
return;
fprintf(stderr, "%s from tap: [%s]:%i\n"
"\t-> [%s]:%i\n",
getprotobynumber(proto)->p_name,
inet_ntop(AF_INET6, &ip6h->saddr, buf_s, sizeof(buf_s)),
ntohs(th->source),
inet_ntop(AF_INET6, &ip6h->daddr, buf_d, sizeof(buf_d)),
ntohs(th->dest));
debug("%s from tap: [%s]:%i\n\t-> [%s]:%i",
getprotobynumber(proto)->p_name,
inet_ntop(AF_INET6, &ip6h->saddr, buf_s, sizeof(buf_s)),
ntohs(th->source),
inet_ntop(AF_INET6, &ip6h->daddr, buf_d, sizeof(buf_d)),
ntohs(th->dest));
}
if (proto == IPPROTO_TCP)
@ -457,8 +458,7 @@ static void sock_handler(struct ctx *c, int fd, uint32_t events)
if (getsockopt(fd, SOL_SOCKET, SO_PROTOCOL, &so, &sl))
return;
fprintf(stderr, "%s: packet from socket %i\n",
getprotobynumber(so)->p_name, fd);
debug("%s: packet from socket %i", getprotobynumber(so)->p_name, fd);
if (so == IPPROTO_ICMP || so == IPPROTO_ICMPV6)
icmp_sock_handler(c, fd, events);
@ -517,32 +517,6 @@ int main(int argc, char **argv)
if (argc != 1)
usage(argv[0]);
get_routes(&c);
get_addrs(&c);
get_dns(&c);
if (c.v4) {
fprintf(stderr, "ARP:\n");
fprintf(stderr, "\taddress: %02x:%02x:%02x:%02x:%02x:%02x "
"from %s\n", c.mac[0], c.mac[1], c.mac[2],
c.mac[3], c.mac[4], c.mac[5], c.ifn);
fprintf(stderr, "DHCP:\n");
fprintf(stderr, "\tassign:\t%s\n\tnmask:\t%s\n"
"\trouter:\t%s\n\tDNS:\t%s\n",
inet_ntop(AF_INET, &c.addr4, buf4[0], sizeof(buf4[0])),
inet_ntop(AF_INET, &c.mask4, buf4[1], sizeof(buf4[1])),
inet_ntop(AF_INET, &c.gw4, buf4[2], sizeof(buf4[2])),
inet_ntop(AF_INET, &c.dns4, buf4[3], sizeof(buf4[3])));
}
if (c.v6) {
fprintf(stderr, "NDP:\n");
fprintf(stderr, "\tassign:\t%s\n\trouter:\t%s\n\tDNS:\t%s\n",
inet_ntop(AF_INET6, &c.addr6, buf6[0], sizeof(buf6[0])),
inet_ntop(AF_INET6, &c.gw6, buf6[1], sizeof(buf6[1])),
inet_ntop(AF_INET6, &c.dns6, buf6[2], sizeof(buf6[2])));
}
fprintf(stderr, "\n");
if (clock_gettime(CLOCK_MONOTONIC, &last_time)) {
perror("clock_gettime");
exit(EXIT_FAILURE);
@ -558,16 +532,51 @@ int main(int argc, char **argv)
exit(EXIT_FAILURE);
fd_unix = sock_unix();
openlog("passt", 0, LOG_DAEMON);
if (daemon(0, 0)) {
fprintf(stderr, "Failed to fork into background\n");
exit(EXIT_FAILURE);
}
get_routes(&c);
get_addrs(&c);
get_dns(&c);
if (c.v4) {
info("ARP:");
info(" address: %02x:%02x:%02x:%02x:%02x:%02x from %s",
c.mac[0], c.mac[1], c.mac[2], c.mac[3], c.mac[4], c.mac[5],
c.ifn);
info("DHCP:");
info(" assign: %s",
inet_ntop(AF_INET, &c.addr4, buf4[0], sizeof(buf4[0])));
info(" mask: %s",
inet_ntop(AF_INET, &c.mask4, buf4[0], sizeof(buf4[0])));
info(" router: %s",
inet_ntop(AF_INET, &c.gw4, buf4[2], sizeof(buf4[2])));
info(" DNS: %s",
inet_ntop(AF_INET, &c.dns4, buf4[3], sizeof(buf4[3])));
}
if (c.v6) {
info("NDP:");
info(" assign: %s",
inet_ntop(AF_INET6, &c.addr6, buf6[0], sizeof(buf6[0])));
info(" router: %s",
inet_ntop(AF_INET6, &c.gw6, buf6[1], sizeof(buf6[1])));
info(" DNS: %s",
inet_ntop(AF_INET6, &c.dns6, buf6[2], sizeof(buf6[2])));
}
listen:
listen(fd_unix, 1);
fprintf(stderr,
"You can now start qrap:\n\t"
"./qrap 5 kvm ... -net socket,fd=5 -net nic,model=virtio\n"
"or directly qemu, patched with:\n\t"
"qemu/0001-net-Allow-also-UNIX-domain-sockets-to-be-used-as-net.patch\n"
"as follows:\n\t"
"kvm ... -net socket,connect="
UNIX_SOCK_PATH " -net nic,model=virtio\n\n");
info("You can now start qrap:");
info(" ./qrap 5 kvm ... -net socket,fd=5 -net nic,model=virtio");
info("or directly qemu, patched with:");
info(" qemu/0001-net-Allow-also-UNIX-domain-sockets-to-be-used-as-net.patch");
info("as follows:");
info("kvm ... -net socket,connect="
UNIX_SOCK_PATH " -net nic,model=virtio");
c.fd_unix = accept(fd_unix, NULL, NULL);
ev.events = EPOLLIN | EPOLLET | EPOLLRDHUP | EPOLLERR | EPOLLHUP;

7
tcp.c
View file

@ -354,8 +354,9 @@ enum tcp_state {
FIN_WAIT_1,
FIN_WAIT_1_SOCK_FIN,
};
#define TCP_STATE_STR_SIZE (FIN_WAIT_1_SOCK_FIN + 1)
static char *tcp_state_str[FIN_WAIT_1_SOCK_FIN + 1] = {
static char *tcp_state_str[TCP_STATE_STR_SIZE] __attribute((__unused__)) = {
"CLOSED", "TAP_SYN_SENT", "SOCK_SYN_SENT", "TAP_SYN_RCVD",
"ESTABLISHED", "ESTABLISHED_SOCK_FIN", "CLOSE_WAIT", "LAST_ACK",
"FIN_WAIT_1", "FIN_WAIT_1_SOCK_FIN",
@ -480,8 +481,8 @@ static void tcp_act_clear(int s)
*/
static void tcp_set_state(int s, enum tcp_state state)
{
fprintf(stderr, "TCP: socket %i: %s -> %s\n", s,
tcp_state_str[tc[s].s], tcp_state_str[state]);
debug("TCP: socket %i: %s -> %s", s,
tcp_state_str[tc[s].s], tcp_state_str[state]);
tc[s].s = state;
}

18
util.c
View file

@ -21,9 +21,27 @@
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <sys/epoll.h>
#include <syslog.h>
#include <stdarg.h>
#include "passt.h"
#define logfn(name, level) \
void name(const char *format, ...) { \
va_list args; \
\
va_start(args, format); \
vsyslog(level, format, args); \
va_end(args); \
}
logfn(err, LOG_ERR)
logfn(warn, LOG_WARNING)
logfn(info, LOG_INFO)
#ifdef DEBUG
logfn(debug, LOG_DEBUG)
#endif
/**
* csum_fold() - Fold long sum for IP and TCP checksum
* @sum: Original long sum

10
util.h
View file

@ -1,3 +1,13 @@
void err(const char *format, ...);
void warn(const char *format, ...);
void info(const char *format, ...);
#ifdef DEBUG
void debug(const char *format, ...);
#else
#define debug(...) { }
#endif
uint16_t csum_fold(uint32_t sum);
uint16_t csum_ip4(void *buf, size_t len);
void csum_tcp4(struct iphdr *iph);