| Age | Commit message (Collapse) | Author |
|---|
|
AddrMaskRequest
|
|
icmpdontfrag() was not working properly, need to pass the
gating source interface. in fact, we now always pass the source
interface to all icmp*() functions, which is used to
determine source ip address of the icmp reply.
also dont generate a icmp response for packets going to
non-unicast addresses (such as broadcast).
increase the amount of icmp response payload, but keep
icmp responses below the minimum ipv4 mtu (68 bytes).
regularize icmpv6 function names.
move icmp unreachable codes to icmpv6.c.
provide the mtu value for icmppkttoobig6().
dont advise announced udp connections.
avoid code duplication in icmp.c and icmpv6.c,
by having single send function with type, code and arg
parameters.
maintain statistics for sent ipv4 icmp types.
avoid route lookup in ipout*() by passing Routehint* to
icmpnohost*().
iladvise()... more like ill advice.
|
|
We used to only clamp to the MTU of the destination interface,
but this is wrong. We have to clamp to the minimum of both
source and destination.
For this, we change the gating argument type of ipoput4()
and ipoput6() from int to Ipifc* to pass the source interface.
|
|
This adds a new route "t"-flag that enables network address translation,
replacing the source address (and local port) of a forwarded packet to
one of the outgoing interface.
The state for a translation is kept in a new Translation structure,
which contains two Iphash entries, so it can be inserted into the
per protocol 4-tuple hash table, requiering no extra lookups.
Translations have a low overhead (~200 bytes on amd64),
so we can have many of them. They get reused after 5 minutes
of inactivity or when the per protocol limit of 1000 entries
is reached (then the one with longest inactivity is reused).
The protocol needs to export a "forward" function that is responsible
for modifying the forwarded packet, and then handle translations in
its input function for iphash hits with Iphash.trans != 0.
This patch also fixes a few minor things found during development:
- Include the Iphash in the Conv structure, avoiding estra malloc
- Fix ttl exceeded check (ttl < 1 -> ttl <= 1)
- Router should not reply with ttl exceeded for multicast flows
- Extra checks for icmp advice to avoid protocol confusions.
|
|
The IPv4 ARP cache used to indefinitely buffer packets in the Arpent hold list.
This is bad in case of a router, because it opens a 1 second
(retransmit time) window to leak all the to be forwarded packets.
This change makes the ipv4 arp code path similar to the IPv6 neighbour
solicitation path, using the retransmit process to time out old entries
(after 3 arp retransmits => 3 seconds).
A new function arpcontinue() has been added that unifies the point when
we schedule the (ipv6 sol retransmit) / (ipv4 arp timeout) and reduce
the hold queue to the last packet and unlock the cache.
As a bonus, we also now send a icmp host unreachable notification
for the dropped packets.
|
|
when making outgoing connections, the source ip was selected
by just iterating from the first to the last interface and
trying each local address until a route was found. the result
was kind of hard to predict as it depends on the interface
order.
this change replaces the algorithm with the route lookup algorithm
that we already have which takes more specific desination and
source prefixes into account. so the order of interfaces does
not matter anymore.
|
|
using ~IP_DF mask to select offset and "more fragments" bits
includes the evil bit 15. so instead define a constant IP_FO
for the fragment offset bits and use (IP_MF|IP_FO). that way
the evil bit gets ignored and doesnt cause any useless calls
to ipreassemble().
|
|
icmp has to advise protocols about the first
fragment only. all other fragments should be
ignored.
|
|
|
|
|
|
no need to rlock ifc in targetttype() as we are called from icmpiput6(),
which the ifc rlocked.
for icmpadvise, the lport, destination *AND* source have to match.
a connection gets a packet when the packets destination matches the source
*OR* the packets source matches the destination.
|
|
address for icmpttlexceeded, cleanup
|
|
|
|
cleanup
rfc4861 7.2.2:
If the source address of the packet prompting the solicitation is the
same as one of the addresses assigned to the outgoing interface, that
address SHOULD be placed in the IP Source Address of the outgoing
solicitation.
this change adds ndbsendsol() which handles the source address selection
and also handles the arp table locking; avoiding access to the arp entry
after the arp table is unlocked.
cleanups:
- use ipmove() instead of memmove().
- useless extern qualifiers
|
|
|
|
|
|
|
|
|
|
|
|
|
