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-rw-r--r--src/libsystemd-network/sd-icmp6-nd.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/src/libsystemd-network/sd-icmp6-nd.c b/src/libsystemd-network/sd-icmp6-nd.c
index 85b8ff93c5..8b567e3a5c 100644
--- a/src/libsystemd-network/sd-icmp6-nd.c
+++ b/src/libsystemd-network/sd-icmp6-nd.c
@@ -237,6 +237,18 @@ int sd_icmp6_nd_new(sd_icmp6_nd **ret) {
return 0;
}
+int sd_icmp6_ra_get_mtu(sd_icmp6_nd *nd, uint32_t *mtu) {
+ assert_return(nd, -EINVAL);
+ assert_return(mtu, -EINVAL);
+
+ if (nd->mtu == 0)
+ return -ENOMSG;
+
+ *mtu = nd->mtu;
+
+ return 0;
+}
+
static int icmp6_ra_parse(sd_icmp6_nd *nd, struct nd_router_advert *ra,
ssize_t len) {
void *opt;
@@ -256,11 +268,26 @@ static int icmp6_ra_parse(sd_icmp6_nd *nd, struct nd_router_advert *ra,
opt_hdr = opt;
while (len != 0 && len >= opt_hdr->nd_opt_len * ICMP6_OPT_LEN_UNITS) {
+ struct nd_opt_mtu *opt_mtu;
+ uint32_t mtu;
if (opt_hdr->nd_opt_len == 0)
return -ENOMSG;
switch (opt_hdr->nd_opt_type) {
+ case ND_OPT_MTU:
+ opt_mtu = opt;
+
+ mtu = be32toh(opt_mtu->nd_opt_mtu_mtu);
+
+ if (mtu != nd->mtu) {
+ nd->mtu = MAX(mtu, IP6_MIN_MTU);
+
+ log_icmp6_nd(nd, "Router Advertisement link MTU %d using %d",
+ mtu, nd->mtu);
+ }
+
+ break;
}