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Patch is based on work by tiggerswelt.net. They say:
"
We wanted udhcpc6 to release its IPv6-Addresses on
quit (-R-commandline-option) which turned out to generate once again
kind of garbage on the network-link.
We tracked this down to two issues:
- udhcpc6 uses a variable called "srv6_buf" to send packets to
the dhcp6-server, but this variable is never initialized correctly
and contained kind of a garbage-address
- The address of the dhcp6-server is usually a link-local-address,
that requires an interface-index when using connect() on an AF_INET6-
socket
We added an
additional parameter for ifindex to d6_send_kernel_packet() and made
d6_recv_raw_packet() to capture the address of the dhcp6-server and
forward it to its callee.
"
Three last patches together:
function old new delta
d6_read_interface - 454 +454
d6_recv_raw_packet - 283 +283
option_to_env 249 504 +255
.rodata 165226 165371 +145
send_d6_discover 195 237 +42
send_d6_select 118 159 +41
send_d6_renew 173 186 +13
send_d6_release 162 173 +11
opt_req - 10 +10
d6_send_kernel_packet 304 312 +8
opt_fqdn_req - 6 +6
d6_mcast_from_client_config_ifindex 48 51 +3
d6_find_option 63 61 -2
udhcpc6_main 2416 2411 -5
static.d6_recv_raw_packet 266 - -266
------------------------------------------------------------------------------
(add/remove: 5/1 grow/shrink: 8/2 up/down: 1271/-273) Total: 998 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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function old new delta
udhcpd_main 1501 1531 +30
d6_recv_raw_packet 251 264 +13
perform_d6_release 188 198 +10
udhcpc6_main 2443 2449 +6
udhcp_recv_raw_packet 582 588 +6
udhcp_recv_kernel_packet 132 138 +6
send_d6_renew 140 146 +6
d6_recv_kernel_packet 118 124 +6
send_renew 77 82 +5
send_discover 85 90 +5
send_decline 84 89 +5
send_d6_select 97 102 +5
send_d6_discover 174 179 +5
perform_release 167 172 +5
count_lines 72 74 +2
udhcpc_main 2836 2837 +1
bb_info_msg 125 - -125
------------------------------------------------------------------------------
(add/remove: 0/2 grow/shrink: 17/4 up/down: 117/-180) Total: -63 bytes
text data bss dec hex filename
924935 906 17160 943001 e6399 busybox_old
924736 906 17160 942802 e62d2 busybox_unstripped
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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It builds. It sends Solicit packets. Not sure these packets are well-formed.
I have no server to test it against.
function old new delta
udhcpc6_main - 2426 +2426
d6_send_raw_packet - 428 +428
d6_send_kernel_packet - 274 +274
d6_recv_raw_packet - 248 +248
send_d6_discover - 177 +177
packed_usage 28795 28966 +171
d6_run_script - 156 +156
send_d6_renew - 140 +140
send_d6_release - 126 +126
d6_recv_kernel_packet - 116 +116
send_d6_select - 95 +95
perform_d6_release - 78 +78
d6_find_option - 74 +74
init_d6_packet - 54 +54
d6_copy_option - 48 +48
d6_mcast_from_client_config_ifindex - 42 +42
d6_dump_packet - 24 +24
static.FF02__1_2 - 16 +16
d6_store_blob - 13 +13
applet_names 2432 2440 +8
applet_main 1412 1416 +4
applet_nameofs 706 708 +2
add_d6_client_options - 1 +1
------------------------------------------------------------------------------
(add/remove: 21/0 grow/shrink: 4/0 up/down: 4721/0) Total: 4721 bytes
text data bss dec hex filename
879080 493 7584 887157 d8975 busybox_old
884585 497 7584 892666 d9efa busybox_unstripped
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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