Understanding Linux Network Internals 2005 phần 3 pptx
Understanding Linux Network Internals 2005 phần 3 pptx
... used by the
drivers/net/3c59x.c driver):
outsl(ioaddr + TX_FIFO, skb->data, (skb->len + 3) >> 2);
dev_kfree_skb (skb);
if (inw(ioaddr + TxFree) > 1 536 ) {
netif_start_queue ... has room for max-sized packet. */
netif_stop_queue(dev);
outw(SetTxThreshold + (1 536 >>2), ioaddr + EL3_CMD);
This document was created by an unregistered ChmMagic, please go to http://ww...
Understanding Linux Network Internals 2005 phần 1 pps
... Overview of Network Stack
Section 13. 2. Executing the Right Protocol Handler
Section 13. 3. Protocol Handler Organization
Section 13. 4. Protocol Handler Registration
Section 13. 5. Ethernet ... Section 35 .2. Helper Routines
Section 35 .3. The Table Lookup: fn_hash_lookup
Section 35 .4. fib_lookup Function
Section 35 .5. Setting Functions for Reception and T...
Understanding Linux Network Internals 2005 phần 2 pdf
...
registers the associated network device. In this case, device Dev3 needs an additional device driver, called B. When driver B eventually
registers with the kernel, Dev3 will be assigned to it. ... 0x20115
MODULE_AUTHOR("Donald Becker <becker@cesdis.gsfc.nasa.gov>");
MODULE_DESCRIPTION("3Com 3c590/3c900 series Vortex/Boomerang driver");
MODULE_PARM(debug, "i&...
Understanding Linux Network Internals 2005 phần 4 docx
... ID BR2
A port ID of 2
Now let's add a new bridge named BR3, and assume that Bridge ID BR3 < Bridge ID BR4, as in Figure 15- 13.
As we explained in the section "Root Bridge Selection," ... topology in Figure 16-2, if we
added one more subnet (10.0 .3. 0/24) and configured eth0 with an address on it, the topology would appear to the Linux kernel routing
layer like the one...
Understanding Linux Network Internals 2005 phần 5 pdf
... and code.
18.4 .3. 3. Example of IP ID generation
The wraparound problem is partially addressed by means of multiple, concurrent, global counters. Instead of a global IP ID, the Linux
kernel ... "Fragmentation and reassembly"). See also the section "Expiration Criteria" in Chapter 33 .
In Linux, the ip_dont_fragment function (shown in Chapter 22) uses the considerat...
Understanding Linux Network Internals 2005 phần 6 ppt
... www.oreilly.com (208.201. 239 .36 ) 56(84) bytes of data
64 bytes from www.oreillynet.com (208.201. 239 .36 ): icmp_seq=0 ttl=50 time=245 ms
64 bytes from www.oreillynet.com (208.201. 239 .36 ): icmp_seq=1 ttl=50 ... sk_buff *skb, u32 info)
Function used by the ICMP protocol handler to inform the L4 protocol about the reception of an ICMP UNREACHABLE
message. We will see in Chapter 35 when...
Understanding Linux Network Internals 2005 phần 7 pot
... notify the neighboring subsystem about changes to devices and
L3 addresses. Notifications about changes to L3 addresses are sent by L3 protocols.
neigh_changeaddr
A function that neighboring protocols ... 29.
Header caching at the L2 layer is tied to caching by the routing subsystem at the L3 layer, described in Chapter 33 . As shown in Figure
27-1, each dst_entry element of the IPv4 routi...
Understanding Linux Network Internals 2005 phần 8 ppsx
... implications of the setups in Figure 30 -4(b) and 30 -4(c) on lower-layer neighboring protocols. In this chapter,
we will look at the implications with regard to routing .
30 .1 .3. Questions Answered in This ... ipv4_devconf structure, which is defined in
include /linux/ inetdevice.h. Not all of its fields are used by the neighboring protocols (see Chapters 23 and 36 for the other fie...
Understanding Linux Network Internals 2005 phần 9 ppsx
... Notifications" in Chapter 32 ).
34 .3. 1. Adding a Route
The insertion of a new route is taken care of by fn_hash_insert, whose logic is described in Figures 34 -3( a) and 34 -3( b).
[*]
This routine ... function, described in the section "Interface Between the DST and Calling Protocols."
33 .3. 3. Adding Elements to the Cache
Every time a cache lookup required to route...
Understanding Linux Network Internals 2005 phần 10 pdf
... initialized, they are set to zero.
u32 r_src
u32 r_srcmask
IP address and netmask, respectively, of the source network from which packets must come.
u32 r_dst
u32 r_dstmask
IP address and netmask, ... Chapter
33 .
fib_tables
List of fib_table instances. See Figure 34 -1 in Chapter 34 .
fib_rules
List of routing policies. See the section "fib_lookup with Policy Routing" in Chapt...