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sd-icmp6-nd: Add helper function to get the IPv6 link MTU

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Update MTU according to the latest value received.
This commit is contained in:
Patrik Flykt
2015-01-27 09:35:24 +02:00
parent 5624c4801e
commit d14b5bc621
2 changed files with 29 additions and 0 deletions
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src/libsystemd-network/sd-icmp6-nd.c
+27
View File
@@ -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;
}
src/systemd/sd-icmp6-nd.h
+2
View File
@@ -51,6 +51,8 @@ sd_icmp6_nd *sd_icmp6_nd_ref(sd_icmp6_nd *nd);
sd_icmp6_nd *sd_icmp6_nd_unref(sd_icmp6_nd *nd);
int sd_icmp6_nd_new(sd_icmp6_nd **ret);
int sd_icmp6_ra_get_mtu(sd_icmp6_nd *nd, uint32_t *mtu);
int sd_icmp6_nd_stop(sd_icmp6_nd *nd);
int sd_icmp6_router_solicitation_start(sd_icmp6_nd *nd);