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icmp6-util: make icmp6_receive() accept the null source address

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Fixes #29050.

(cherry picked from commit 4961f56646)
(cherry picked from commit fabdb2832d)
(cherry picked from commit 262ba9bba6)
This commit is contained in:
Yu Watanabe 2023-09-04 17:44:45 +09:00 committed by Luca Boccassi
parent 4ebd2c664d
commit 29c801d2d7
5 changed files with 33 additions and 4 deletions
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10
src/libsystemd-network/fuzz-ndisc-rs.c
View File

@ -22,6 +22,13 @@ int icmp6_bind_router_advertisement(int index) {
return -ENOSYS;
}
static struct in6_addr dummy_link_local = {
.s6_addr = {
0xfe, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x12, 0x34, 0x56, 0xff, 0xfe, 0x78, 0x9a, 0xbc,
},
};
int icmp6_receive(
int fd,
void *iov_base,
@ -34,6 +41,9 @@ int icmp6_receive(
if (ret_timestamp)
triple_timestamp_get(ret_timestamp);
if (ret_sender)
*ret_sender = dummy_link_local;
return 0;
}

2
src/libsystemd-network/icmp6-util.c
View File

@ -182,7 +182,7 @@ int icmp6_receive(
sa.in6.sin6_family == AF_INET6) {
addr = sa.in6.sin6_addr;
if (!in6_addr_is_link_local(&addr))
if (!in6_addr_is_link_local(&addr) && !in6_addr_is_null(&addr))
return -EADDRNOTAVAIL;
} else if (msg.msg_namelen > 0)

7
src/libsystemd-network/sd-ndisc.c
View File

@ -227,7 +227,7 @@ static int ndisc_recv(sd_event_source *s, int fd, uint32_t revents, void *userda
switch (r) {
case -EADDRNOTAVAIL:
log_ndisc(nd, "Received RA from non-link-local address. Ignoring.");
log_ndisc(nd, "Received RA from neither link-local nor null address. Ignoring.");
break;
case -EMULTIHOP:
@ -246,6 +246,11 @@ static int ndisc_recv(sd_event_source *s, int fd, uint32_t revents, void *userda
return 0;
}
/* The function icmp6_receive() accepts the null source address, but RFC 4861 Section 6.1.2 states
* that hosts MUST discard messages with the null source address. */
if (in6_addr_is_null(&rt->address))
log_ndisc(nd, "Received RA from null address. Ignoring.");
(void) event_source_disable(nd->timeout_event_source);
(void) ndisc_handle_datagram(nd, rt);
return 0;

5
src/libsystemd-network/sd-radv.c
View File

@ -271,7 +271,7 @@ static int radv_recv(sd_event_source *s, int fd, uint32_t revents, void *userdat
switch (r) {
case -EADDRNOTAVAIL:
log_radv(ra, "Received RS from non-link-local address. Ignoring");
log_radv(ra, "Received RS from neither link-local nor null address. Ignoring");
break;
case -EMULTIHOP:
@ -295,6 +295,9 @@ static int radv_recv(sd_event_source *s, int fd, uint32_t revents, void *userdat
return 0;
}
/* TODO: if the sender address is null, check that the message does not have the source link-layer
* address option. See RFC 4861 Section 6.1.1. */
const char *addr = IN6_ADDR_TO_STRING(&src);
r = radv_send(ra, &src, ra->lifetime_usec);

13
src/libsystemd-network/test-ndisc-rs.c
View File

@ -41,7 +41,8 @@ static void router_dump(sd_ndisc_router *rt) {
assert_se(rt);
log_info("--");
assert_se(sd_ndisc_router_get_address(rt, &addr) == -ENODATA);
assert_se(sd_ndisc_router_get_address(rt, &addr) >= 0);
log_info("Sender: %s", IN6_ADDR_TO_STRING(&addr));
assert_se(sd_ndisc_router_get_timestamp(rt, CLOCK_REALTIME, &t) >= 0);
log_info("Timestamp: %s", FORMAT_TIMESTAMP(t));
@ -176,6 +177,13 @@ int icmp6_bind_router_advertisement(int ifindex) {
return -ENOSYS;
}
static struct in6_addr dummy_link_local = {
.s6_addr = {
0xfe, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x12, 0x34, 0x56, 0xff, 0xfe, 0x78, 0x9a, 0xbc,
},
};
int icmp6_receive(
int fd,
void *iov_base,
@ -188,6 +196,9 @@ int icmp6_receive(
if (ret_timestamp)
triple_timestamp_get(ret_timestamp);
if (ret_sender)
*ret_sender = dummy_link_local;
return 0;
}