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packet lib: icmpv6.nd_router_advert: skip unknown options correctly

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this should fix a problem reported by Gabriele Gerbino on ryu-devel.

Signed-off-by: YAMAMOTO Takashi <yamamoto@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
This commit is contained in:
YAMAMOTO Takashi 2013-10-18 16:12:11 +09:00 committed by FUJITA Tomonori
parent 96f857c643
commit 97aff06df4
1 changed files with 3 additions and 2 deletions
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5
ryu/lib/packet/icmpv6.py
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@ -373,13 +373,14 @@ class nd_router_advert(stringify.StringifyMixin):
msg.length.append(length)
cls_ = cls._ND_OPTION_TYPES.get(type_, None)
offset += 2
byte_len = length * 8 - 2
if cls_:
msg.data.append(cls_.parser(buf[:offset+cls_._MIN_LEN],
offset))
offset += cls_._MIN_LEN
else:
msg.data.append(buf[offset:])
offset = len(buf)
msg.data.append(buf[offset:offset + byte_len])
offset += byte_len
return msg