diff options
| author | Patrik Flykt <patrik.flykt@linux.intel.com> | 2015-01-20 19:35:59 +0200 |
|---|---|---|
| committer | Patrik Flykt <patrik.flykt@linux.intel.com> | 2015-01-27 09:35:24 +0200 |
| commit | d14b5bc621fc1fa57ef0db3ccba6957efed8e7d4 (patch) | |
| tree | feb369278b7cb3d759aa979990ad919e8be657cd /src/libsystemd-network/sd-icmp6-nd.c | |
| parent | 5624c4801e6281189a876fb2bdd65ff276cae514 (diff) | |
sd-icmp6-nd: Add helper function to get the IPv6 link MTU
Update MTU according to the latest value received.
Diffstat (limited to 'src/libsystemd-network/sd-icmp6-nd.c')
| -rw-r--r-- | src/libsystemd-network/sd-icmp6-nd.c | 27 |
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; } |