Gregory Nutt
fb8cf9373c
net/udp: Resolve race condition in connection-less UDP sockets with read-ahead buffering.
...
In connection-mode UDP sockets, a remote address is retained in the UDP connection structure. This determines both there send() will send the packets and which packets recv() will accept.
This same mechanism is used for connection-less UDP sendto: A temporary remote address is written into the connection structure to support the sendto() operation. That address persists until the next recvfrom() when it is reset to accept any address.
When UDP read-ahead buffering is enabled, however, that means that the old, invalid remote address can be left in the connection structure for some time. This can cause read-ahead buffer to fail, dropping UDP packets.
Shortening the time between when he remote address is reset (i.e., immediately after the sendto() completes) is not a solution, that does not eliminate the race condition; in only makes it smaller.
With this change, a flag was added to the connection structure to indicate if the UDP socket is in connection mode or if it is connection-less. This change effects only UDP receive operations: The remote address in the UDP connection is always ignored if the UDP socket is not in connection-mode.
No for connection-mode sockets, that remote address behaves as before. But for connection-less sockets, it is only used by sendto().
2018-05-13 09:57:34 -06:00
Gregory Nutt
b54ffe858a
Standardization of some function headers.
2018-03-13 09:52:27 -06:00
Gregory Nutt
7cf88d7dbd
Make sure that labeling is used consistently in all function headers.
2018-02-01 10:00:02 -06:00
Gregory Nutt
0b2a4eb4bd
Networking: A little more wording changes related to interrupts vs. events
2017-08-29 15:08:38 -06:00
Gregory Nutt
799b2d5671
Update comments.
2017-07-17 07:14:12 -06:00
Gregory Nutt
d9a2a3c3f1
Networking: When upd_input() cannot process a packet, it returns ERROR so that network drivers may try calling ipv4_input() later. In this case, it must also set d_len to zero. Otherwise, all network drivers will assume tht there is also an outgoing packet. This results in a gratuitous ARP.
2017-07-17 06:50:39 -06:00
Gregory Nutt
d40a473f72
Without lowsyslog() *llwarn() is not useful. Eliminate and replace with *warn().
2016-06-20 09:37:08 -06:00
Gregory Nutt
7d0950bb22
net/: Change some nerr() ERRORS to nwarn() WARNINGS. Anomolous network events are not errors.
2016-06-12 07:09:37 -06:00
Gregory Nutt
f4fcdcdb4d
net/: Change some *err() message to *info() messages if what was a *dbg() message does not indicate and error condition.
2016-06-11 17:37:21 -06:00
Gregory Nutt
e99301d7c2
Rename *lldbg to *llerr
2016-06-11 14:55:27 -06:00
Gregory Nutt
c98f00a93b
Update comments; trivial addtion to a document.
2016-06-10 09:36:59 -06:00
Gregory Nutt
9ff645a298
drivers/ieee802154: Add a skeleton IEEE802154 driver
2016-02-25 15:11:30 -06:00
Gregory Nutt
0fb035f76b
Standardize some naming in code section comments
2016-02-21 18:09:04 -06:00
Gregory Nutt
cb9e27c3b0
Standardize naming used for public data and function groupings
2015-10-02 16:30:35 -06:00
Gregory Nutt
af71b7a1ed
Networking: Eliminate a warning with UDP checksums are suppressed
2015-01-23 11:42:12 -06:00
Gregory Nutt
f4ce875711
Networking: Fix issues with UDP packet length and checksum calculations when IPv6 is selected
2015-01-23 09:33:18 -06:00
Gregory Nutt
2c251d845c
include/net/if.h: Add a bit to the device flags to indicate if the device packet buffer holds an IPv4 or an IPv6 domain packet. Set/clear the flag along with the correct offset to the application payload data as each packet is received.
...
net/socket, net/tcp, net/udp: Add logic to select the domain of the outputgoing packet before sending any UDP or TCP packet. This sets the bit to indicate the IPv4 or IPv6 domain and the correct offset to the output going payload data.
2015-01-17 07:42:09 -06:00
Gregory Nutt
88a0e82934
Networking: Remove field d_sndata from the device structure. It is the same as d_appdata and unnecessary
2015-01-17 05:59:13 -06:00
Gregory Nutt
8f8259a0d6
Networking: UDP and TCP MSS depends on the IP header size (as well as the link layer header size) and cannot be represented with a single value.
2015-01-16 15:03:10 -06:00
Gregory Nutt
630366272a
Networking: Seperate tcp_input() and udp_input() into seprate functions tcp_ipv4_input(), tcp_ipv6_input(), udp_ipv4_input(), and upd_ipv6_input() than can deal will the data offsets caused by the differing sizes of the IP header.
2015-01-15 15:06:46 -06:00
Gregory Nutt
aa9700c1ab
Update comments and read me
2014-11-23 12:52:18 -06:00
Gregory Nutt
2e55db369d
Network: All logic will now handle varialbe length link layer protocol headers within incoming packets. This permits use of multiple network interfaces with differing data links. For example, ETHERNET + SLIP
2014-11-15 13:13:23 -06:00
Gregory Nutt
73f3ecf7e2
NET: Rename network interrupt event flags more appropriately: TCP_, UDP_, ICMP_, or PKT_ vs UIP_
2014-07-06 17:22:02 -06:00
Gregory Nutt
c5fc24e110
NET: Standardize naming of all protocal header lengths
2014-07-05 13:04:48 -06:00
Gregory Nutt
0bb153b8cb
Remove all inclusion of uip.h
2014-07-04 16:58:22 -06:00
Gregory Nutt
cce35ce975
NET: More renaming
2014-07-04 15:40:49 -06:00
Gregory Nutt
5790c94ba3
Rename net/uip to net/devif. Rename uip/uip.h to devif/devif.h
2014-06-28 18:07:02 -06:00
Gregory Nutt
50b749a636
Clean-up naming associated with network checksums
2014-06-27 17:51:32 -06:00
Gregory Nutt
fce2a79abd
Rename uip_driver_s net_driver_s
2014-06-27 16:48:12 -06:00
Gregory Nutt
e1091251e6
NET: Move statistcs from uip.h to new netstats.h to remove nasty circular inclusion problem.
2014-06-26 09:32:39 -06:00
Gregory Nutt
abf04708ce
Clean up all UDP-related naming
2014-06-24 18:55:01 -06:00
Gregory Nutt
5d1f8180d4
Move the remaining files from include/nuttx/net/uip to include/nuttx/net; Rename *_internal.h header files in net/ to just *.h
2014-06-24 10:14:15 -06:00
Gregory Nutt
37646044ac
Move include/nuttx/net/uip/uip-arch.h to include/nuttx/net/netdev.h
2014-06-24 09:28:44 -06:00
Gregory Nutt
626469e30c
Move include/nuttx/net/uipopt.h to include/nuttx/net/netconfig.h
2014-06-24 08:53:28 -06:00
Gregory Nutt
382920b9a9
Move UDP files from net/uip to net/udp
2014-06-18 10:50:09 -06:00
