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authorDenys Vlasenko <vda.linux@googlemail.com>2020-12-13 14:58:11 +0100
committerDenys Vlasenko <vda.linux@googlemail.com>2020-12-13 14:58:11 +0100
commitb4b182807687a872c49a89b840754a553c00f8a1 (patch)
tree47904a2844d19d8ace84b6b0ae28034ff8758214 /networking
parent80551731288a6abf9657e07e82d55a23bc5a970e (diff)
downloadbusybox-b4b182807687a872c49a89b840754a553c00f8a1.tar.gz
traceroute: make "ipv4 or ipv6?" cheaper to find out
function old new delta traceroute_init 1131 1135 +4 hexdump 274 270 -4 common_traceroute_main 1730 1715 -15 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 1/2 up/down: 4/-19) Total: -15 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'networking')
-rw-r--r--networking/traceroute.c36
1 files changed, 21 insertions, 15 deletions
diff --git a/networking/traceroute.c b/networking/traceroute.c
index 8e13238bf..4d0ebc3b7 100644
--- a/networking/traceroute.c
+++ b/networking/traceroute.c
@@ -324,7 +324,6 @@
#ifndef IPPROTO_IP
# define IPPROTO_IP 0
#endif
-
/* Some operating systems, like GNU/Hurd, don't define SOL_RAW, but do have
* IPPROTO_RAW. Since the IPPROTO definitions are also valid to use for
* setsockopt (and take the same value as their corresponding SOL definitions,
@@ -391,19 +390,24 @@ struct globals {
struct ip *outip;
/* Pointer to ICMP or UDP payload (not header): */
struct outdata_t *outdata;
-
len_and_sockaddr *dest_lsa;
len_and_sockaddr *from_lsa; /* response came from this address */
struct sockaddr *to; /* response came to this (local) address */
- int packlen; /* total length of packet */
- int pmtu; /* Path MTU Discovery (RFC1191) */
uint32_t ident;
uint16_t port; /* start udp dest port # for probe packets */
+#if ENABLE_TRACEROUTE6
+ smallint ipv6;
+# define G_ipv6 G.ipv6
+#else
+# define G_ipv6 0
+#endif
+ int packlen; /* total length of packet */
+ int pmtu; /* Path MTU Discovery (RFC1191) */
int waittime; /* time to wait for response (in seconds) */
int first_ttl;
int nprobes;
- unsigned pausemsecs;
int max_ttl;
+ unsigned pausemsecs;
unsigned char recv_pkt[512]; /* last inbound (icmp) packet */
};
@@ -482,7 +486,7 @@ send_probe(int seq, int ttl)
/* Payload */
#if ENABLE_TRACEROUTE6
- if (dest_lsa->u.sa.sa_family == AF_INET6) {
+ if (G_ipv6) {
struct outdata6_t *pkt = (void *) outdata;
pkt->ident6 = ident;
pkt->seq6 = htonl(seq);
@@ -541,7 +545,7 @@ send_probe(int seq, int ttl)
#endif
#if ENABLE_TRACEROUTE6
- if (dest_lsa->u.sa.sa_family == AF_INET6) {
+ if (G_ipv6) {
res = setsockopt_int(sndsock, SOL_IPV6, IPV6_UNICAST_HOPS, ttl);
if (res != 0)
bb_perror_msg_and_die("setsockopt(%s) %d", "UNICAST_HOPS", ttl);
@@ -585,7 +589,7 @@ pr_type(unsigned char t)
[16] = "Neighbor Advert", "Redirect",
};
- if (dest_lsa->u.sa.sa_family == AF_INET6) {
+ if (G_ipv6) {
if (t < 5)
return ttab6[t];
if (t < 128 || t > ND_REDIRECT)
@@ -772,7 +776,7 @@ packet6_ok(int read_len, int seq)
static int
packet_ok(int read_len, int seq)
{
- if (G.from_lsa->u.sa.sa_family == AF_INET)
+ if (!G_ipv6)
return packet4_ok(read_len, seq);
return packet6_ok(read_len, seq);
}
@@ -792,10 +796,10 @@ print(int read_len)
printf(" %s", ina);
} else {
char *n = NULL;
- if (G.from_lsa->u.sa.sa_family != AF_INET
+ if (G_ipv6
|| G.from_lsa->u.sin.sin_addr.s_addr != INADDR_ANY
) {
- /* Try to reverse resolve if it is not 0.0.0.0 */
+ /* Reverse resolve if IPV6 or not 0.0.0.0 */
n = auto_string(xmalloc_sockaddr2host_noport(&G.from_lsa->u.sa));
}
printf(" %s (%s)", (n ? n : ina), ina);
@@ -808,7 +812,7 @@ print(int read_len)
* Reads from (AF_INET6, SOCK_RAW, IPPROTO_ICMPV6) do strip IPv6
* header and return only ICMP6 packet. Weird.
*/
- if (G.from_lsa->u.sa.sa_family == AF_INET6) {
+ if (G_ipv6) {
/* read_len -= sizeof(struct ip6_hdr); - WRONG! */
} else
#endif
@@ -904,7 +908,9 @@ traceroute_init(int op, char **argv)
af = AF_INET6;
dest_lsa = xhost_and_af2sockaddr(argv[0], port, af);
af = dest_lsa->u.sa.sa_family;
+//TODO: make sure af == AF_INET[6]? (FEATURE_UNIX_LOCAL=y allows "local:/PATH" to be translated to AF_UNIX)
if (af == AF_INET6) {
+ G_ipv6 = 1;
packlen = sizeof(struct ip6_hdr)
+ sizeof(struct udphdr)
+ sizeof(struct outdata6_t);
@@ -914,9 +920,9 @@ traceroute_init(int op, char **argv)
+ sizeof(struct outdata6_t);
}
#else
- dest_lsa = xhost2sockaddr(argv[0], port);
+ /* accept only IPv4 addresses */
+ dest_lsa = xhost_and_af2sockaddr(argv[0], port, AF_INET);
#endif
-//TODO: make sure af == AF_INET[6]? (FEATURE_UNIX_LOCAL=y allows "local:/PATH" to be translated to AF_UNIX)
G.from_lsa = xmemdup(dest_lsa, LSA_LEN_SIZE + dest_lsa->len);
G.to = xzalloc(dest_lsa->len);
if (argv[1])
@@ -1117,7 +1123,7 @@ common_traceroute_main(int op, char **argv)
memcpy(lastaddr, &G.from_lsa->u.sa, G.from_lsa->len);
}
print_delta_ms(t1, t2);
- if (G.from_lsa->u.sa.sa_family == AF_INET) {
+ if (!G_ipv6) {
if (op & OPT_TTL_FLAG) {
struct ip *ip = (struct ip *)recv_pkt;
printf(" (%d)", ip->ip_ttl);