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Commit 4d30fed6 authored by Matthieu Boutier's avatar Matthieu Boutier Committed by Juliusz Chroboczek
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Read Source Prefix mandatory sub-TLV.

parent bbadcca4
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Inline Side-by-side
Showing with 178 additions and 42 deletions
message.c
View file @ 4d30fed6
......@@ -115,9 +115,10 @@ network_prefix(int ae, int plen, unsigned int omitted,
}
static int
parse_update_subtlv(struct interface *ifp, int metric,
parse_update_subtlv(struct interface *ifp, int metric, int ae,
const unsigned char *a, int alen,
unsigned char *channels, int *channels_len_return)
unsigned char *channels, int *channels_len_return,
unsigned char *src_prefix, unsigned char *src_plen)
{
int type, len, i = 0;
int channels_len;
......@@ -143,21 +144,28 @@ parse_update_subtlv(struct interface *ifp, int metric,
continue;
}
if(i + 1 > alen) {
fprintf(stderr, "Received truncated sub-TLV on Update.\n");
return -1;
}
if(i + 1 > alen)
goto fail;
len = a[i + 1];
if(i + len + 2 > alen) {
fprintf(stderr, "Received truncated sub-TLV on Update.\n");
return -1;
}
if(i + len + 2 > alen)
goto fail;
if(type == SUBTLV_PADN) {
/* Nothing. */
} else if(type == SUBTLV_DIVERSITY) {
memcpy(channels, a + i + 2, MIN(len, *channels_len_return));
channels_len = MIN(len, *channels_len_return);
} else if(type == SUBTLV_SOURCE_PREFIX) {
int rc;
if(len < 1)
goto fail;
*src_plen = a[i + 2];
rc = network_prefix(ae, *src_plen, 0, a + i + 3, NULL,
len - 1, src_prefix);
if(rc < 0)
goto fail;
if(ae == 1)
(*src_plen) += 96;
} else {
debugf("Received unknown%s Update sub-TLV %d.\n",
(type & 0x80) != 0 ? " mandatory" : "", type);
......@@ -169,6 +177,10 @@ parse_update_subtlv(struct interface *ifp, int metric,
}
*channels_len_return = channels_len;
return 1;
fail:
fprintf(stderr, "Received truncated sub-TLV on Update.\n");
return -1;
}
static int
......@@ -243,6 +255,7 @@ parse_ihu_subtlv(const unsigned char *a, int alen,
fprintf(stderr, "Received truncated sub-TLV on IHU.\n");
return -1;
}
len = a[i + 1];
if(i + len + 2 > alen) {
fprintf(stderr, "Received truncated sub-TLV on IHU.\n");
......@@ -281,7 +294,8 @@ parse_ihu_subtlv(const unsigned char *a, int alen,
}
static int
parse_other_subtlv(const unsigned char *a, int alen)
parse_request_subtlv(int ae, const unsigned char *a, int alen,
unsigned char *src_prefix, unsigned char *src_plen)
{
int type, len, i = 0;
......@@ -292,16 +306,107 @@ parse_other_subtlv(const unsigned char *a, int alen)
continue;
}
if(i + 1 > alen) {
fprintf(stderr, "Received truncated sub-TLV.\n");
return -1;
if(i + 1 > alen)
goto fail;
len = a[i + 1];
if(i + len > alen)
goto fail;
if(type == SUBTLV_PADN) {
/* Nothing to do. */
} else if(type == SUBTLV_SOURCE_PREFIX) {
int rc;
if(len < 1)
goto fail;
*src_plen = a[i + 2];
rc = network_prefix(ae, *src_plen, 0, a + i + 3, NULL,
len - 1, src_prefix);
if(rc < 0)
goto fail;
if(ae == 1)
(*src_plen) += 96;
} else {
debugf("Received unknown%s Route Request sub-TLV %d.\n",
((type & 0x80) != 0) ? " mandatory" : "", type);
if((type & 0x80) != 0)
return -1;
}
i += len + 2;
}
return 1;
fail:
fprintf(stderr, "Received truncated sub-TLV on Route Request.\n");
return -1;
}
static int
parse_seqno_request_subtlv(int ae, const unsigned char *a, int alen,
unsigned char *src_prefix, unsigned char *src_plen)
{
int type, len, i = 0;
while(i < alen) {
type = a[0];
if(type == SUBTLV_PAD1) {
i++;
continue;
}
if(i + 1 > alen)
goto fail;
len = a[i + 1];
if(i + len + 2 > alen) {
fprintf(stderr, "Received truncated sub-TLV.\n");
return -1;
if(i + len + 2 > alen)
goto fail;
if(type == SUBTLV_PADN) {
/* Nothing to do. */
} else if(type == SUBTLV_SOURCE_PREFIX) {
int rc;
if(len < 1)
goto fail;
*src_plen = a[i + 2];
rc = network_prefix(ae, *src_plen, 0, a + i + 3, NULL,
len - 1, src_prefix);
if(rc < 0)
goto fail;
if(ae == 1)
(*src_plen) += 96;
} else {
debugf("Received unknown%s Route Request sub-TLV %d.\n",
((type & 0x80) != 0) ? " mandatory" : "", type);
if((type & 0x80) != 0)
return -1;
}
i += len + 2;
}
return 1;
fail:
fprintf(stderr, "Received truncated sub-TLV on Route Request.\n");
return -1;
}
static int
parse_other_subtlv(const unsigned char *a, int alen)
{
int type, len, i = 0;
while(i < alen) {
type = a[0];
if(type == SUBTLV_PAD1) {
i++;
continue;
}
if(i + 1 > alen)
goto fail;
len = a[i + 1];
if(i + len > alen)
goto fail;
if((type & 0x80) != 0) {
debugf("Received unknown mandatory sub-TLV %d.\n", type);
return -1;
......@@ -310,6 +415,9 @@ parse_other_subtlv(const unsigned char *a, int alen)
i += len + 2;
}
return 1;
fail:
fprintf(stderr, "Received truncated sub-TLV.\n");
return -1;
}
static int
......@@ -522,7 +630,7 @@ parse_packet(const unsigned char *from, struct interface *ifp,
unsigned char channels[MAX_CHANNEL_HOPS];
int channels_len = MAX_CHANNEL_HOPS;
unsigned short interval, seqno, metric;
int rc, parsed_len;
int rc, parsed_len, is_ss;
if(len < 10) {
if(len < 2 || message[3] & 0x80)
have_v4_prefix = have_v6_prefix = 0;
......@@ -582,7 +690,6 @@ parse_packet(const unsigned char *from, struct interface *ifp,
(message[3] & 0x40) ? "/id" : "",
format_prefix(prefix, plen),
format_address(from), ifp->name);
if(message[2] == 0) {
rc = parse_other_subtlv(message + 12, len - 10);
if(rc < 0)
......@@ -604,10 +711,20 @@ parse_packet(const unsigned char *from, struct interface *ifp,
nh = neigh->address;
}
rc = parse_update_subtlv(ifp, metric, message + 2 + parsed_len,
len - parsed_len, channels, &channels_len);
if (rc < 0)
rc = parse_update_subtlv(ifp, metric, message[2],
message + 2 + parsed_len,
len - parsed_len, channels, &channels_len,
src_prefix, &src_plen);
if(rc < 0)
goto done;
is_ss = !is_default(src_prefix, src_plen);
debugf("Received update%s%s for dst %s%s%s from %s on %s.\n",
(message[3] & 0x80) ? "/prefix" : "",
(message[3] & 0x40) ? "/id" : "",
format_prefix(prefix, plen),
is_ss ? " src " : "",
is_ss ? format_prefix(src_prefix, src_plen) : "",
format_address(from), ifp->name);
if(message[2] == 1) {
if(!ifp->ipv4)
......@@ -619,19 +736,33 @@ parse_packet(const unsigned char *from, struct interface *ifp,
channels, channels_len);
} else if(type == MESSAGE_REQUEST) {
unsigned char prefix[16], src_prefix[16], plen, src_plen;
int rc;
int rc, is_ss;
if(len < 2) goto fail;
rc = network_prefix(message[2], message[3], 0,
message + 4, NULL, len - 2, prefix);
if(rc < 0) goto fail;
plen = message[3] + (message[2] == 1 ? 96 : 0);
debugf("Received request for %s from %s on %s.\n",
message[2] == 0 ? "any" : format_prefix(prefix, plen),
format_address(from), ifp->name);
rc = parse_other_subtlv(message + 4 + rc, len - 2 - rc);
if(message[2] == 1) {
v4tov6(src_prefix, zeroes);
src_plen = 96;
} else {
memcpy(src_prefix, zeroes, 16);
src_plen = 0;
}
rc = parse_request_subtlv(message[2], message + 4 + rc,
len - 2 - rc, src_prefix, &src_plen);
if(rc < 0)
goto done;
is_ss = !is_default(src_prefix, src_plen);
if(message[2] == 0) {
if(is_ss) {
/* Wildcard requests don't carry a source prefix. */
fprintf(stderr,
"Received source-specific wildcard request.\n");
goto done;
}
debugf("Received request for any from %s on %s.\n",
format_address(from), ifp->name);
/* If a neighbour is requesting a full route dump from us,
we might as well send it an IHU. */
send_ihu(neigh, NULL);
......@@ -640,31 +771,26 @@ parse_packet(const unsigned char *from, struct interface *ifp,
update storm. Ignore a wildcard request that happens
shortly after we sent a full update. */
if(neigh->ifp->last_update_time <
now.tv_sec - MAX(neigh->ifp->hello_interval / 100, 1))
send_update(neigh->ifp, 0, NULL, 0, zeroes, 0);
} else {
if(message[2] == 1) {
v4tov6(src_prefix, zeroes);
src_plen = 96;
} else {
memcpy(src_prefix, zeroes, 16);
src_plen = 0;
now.tv_sec - MAX(neigh->ifp->hello_interval / 100, 1)) {
send_update(neigh->ifp, 0, NULL, 0, NULL, 0);
}
} else {
debugf("Received request for dst %s%s%s from %s on %s.\n",
message[2] == 0 ? "" : format_prefix(prefix, plen),
is_ss ? " src " : "",
is_ss ? format_prefix(src_prefix, src_plen) : "",
format_address(from), ifp->name);
send_update(neigh->ifp, 0, prefix, plen, src_prefix, src_plen);
}
} else if(type == MESSAGE_MH_REQUEST) {
unsigned char prefix[16], src_prefix[16], plen, src_plen;
unsigned short seqno;
int rc;
int rc, is_ss;
if(len < 14) goto fail;
DO_NTOHS(seqno, message + 4);
rc = network_prefix(message[2], message[3], 0,
message + 16, NULL, len - 14, prefix);
if(rc < 0) goto fail;
rc = parse_other_subtlv(message + 16 + rc, len - 14 - rc);
if(rc < 0)
goto done;
plen = message[3] + (message[2] == 1 ? 96 : 0);
if(message[2] == 1) {
v4tov6(src_prefix, zeroes);
src_plen = 96;
......@@ -672,9 +798,19 @@ parse_packet(const unsigned char *from, struct interface *ifp,
memcpy(src_prefix, zeroes, 16);
src_plen = 0;
}
debugf("Received request (%d) for %s from %s on %s (%s, %d).\n",
rc = parse_seqno_request_subtlv(message[2], message + 16 + rc,
len - 14 - rc, src_prefix,
&src_plen);
if(rc < 0)
goto done;
is_ss = !is_default(src_prefix, src_plen);
plen = message[3] + (message[2] == 1 ? 96 : 0);
debugf("Received request (%d) for dst %s%s%s from %s on "
"%s (%s, %d).\n",
message[6],
format_prefix(prefix, plen),
is_ss ? " src " : "",
is_ss ? format_prefix(src_prefix, src_plen) : "",
format_address(from), ifp->name,
format_eui64(message + 8), seqno);
handle_request(neigh, prefix, plen, src_prefix, src_plen,
......
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