From ed898ed2ddc1e3627555488671155420a32d0167 Mon Sep 17 00:00:00 2001 From: Denys Vlasenko Date: Mon, 27 Mar 2017 22:32:44 +0200 Subject: udhcp6: fix releasing 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 --- networking/udhcp/d6_dhcpc.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) (limited to 'networking/udhcp/d6_dhcpc.c') diff --git a/networking/udhcp/d6_dhcpc.c b/networking/udhcp/d6_dhcpc.c index a0cdded11..95de74f9b 100644 --- a/networking/udhcp/d6_dhcpc.c +++ b/networking/udhcp/d6_dhcpc.c @@ -623,7 +623,8 @@ static NOINLINE int send_d6_renew(uint32_t xid, struct in6_addr *server_ipv6, st return d6_send_kernel_packet( &packet, (opt_ptr - (uint8_t*) &packet), our_cur_ipv6, CLIENT_PORT6, - server_ipv6, SERVER_PORT6 + server_ipv6, SERVER_PORT6, + client_config.ifindex ); return d6_mcast_from_client_config_ifindex(&packet, opt_ptr); } @@ -645,15 +646,14 @@ static int send_d6_release(struct in6_addr *server_ipv6, struct in6_addr *our_cu return d6_send_kernel_packet( &packet, (opt_ptr - (uint8_t*) &packet), our_cur_ipv6, CLIENT_PORT6, - server_ipv6, SERVER_PORT6 + server_ipv6, SERVER_PORT6, + client_config.ifindex ); } /* Returns -1 on errors that are fatal for the socket, -2 for those that aren't */ /* NOINLINE: limit stack usage in caller */ -static NOINLINE int d6_recv_raw_packet(struct in6_addr *peer_ipv6 - UNUSED_PARAM - , struct d6_packet *d6_pkt, int fd) +static NOINLINE int d6_recv_raw_packet(struct in6_addr *peer_ipv6, struct d6_packet *d6_pkt, int fd) { int bytes; struct ip6_udp_d6_packet packet; @@ -702,6 +702,9 @@ static NOINLINE int d6_recv_raw_packet(struct in6_addr *peer_ipv6 // return -2; // } + if (peer_ipv6) + *peer_ipv6 = packet.ip6.ip6_src; /* struct copy */ + log1("received %s", "a packet"); d6_dump_packet(&packet.data); -- cgit v1.2.3