From f5877367522aad0b27d138e4a56d01be3bd33f2d Mon Sep 17 00:00:00 2001 From: Hans Dedecker Date: Tue, 10 Dec 2013 09:39:35 +0100 Subject: [PATCH] Fix Router Advertisement/Solicitation option parsing --- src/router.c | 20 +++++++------------- src/router.h | 18 ++++++++++++++---- 2 files changed, 21 insertions(+), 17 deletions(-) diff --git a/src/router.c b/src/router.c index 83da938..0b01a77 100644 --- a/src/router.c +++ b/src/router.c @@ -211,7 +211,7 @@ static void send_router_advert(struct uloop_timeout *event) struct { struct nd_router_advert h; - struct icmpv6_opt lladdr; + struct nd_opt_slla lladdr; struct nd_opt_mtu mtu; struct nd_opt_prefix_info prefix[RELAYD_MAX_PREFIXES]; } adv = { @@ -227,7 +227,7 @@ static void send_router_advert(struct uloop_timeout *event) adv.h.nd_ra_flags_reserved |= ND_RA_PREF_LOW; else if (iface->route_preference > 0) adv.h.nd_ra_flags_reserved |= ND_RA_PREF_HIGH; - odhcpd_get_mac(iface, adv.lladdr.data); + odhcpd_get_mac(iface, adv.lladdr.addr); // If not currently shutting down struct odhcpd_ipaddr addrs[RELAYD_MAX_PREFIXES]; @@ -319,14 +319,7 @@ static void send_router_advert(struct uloop_timeout *event) if (!dns_addr) dns_cnt = 0; - struct { - uint8_t type; - uint8_t len; - uint8_t pad; - uint8_t pad2; - uint32_t lifetime; - } dns = {ND_OPT_RECURSIVE_DNS, (1 + (2 * dns_cnt)), 0, 0, htonl(dns_time)}; - + struct nd_opt_recursive_dns dns = {ND_OPT_RECURSIVE_DNS, (1 + (2 * dns_cnt)), 0, 0, htonl(dns_time)}; // DNS Search options @@ -455,11 +448,12 @@ static void forward_router_advertisement(uint8_t *data, size_t len) icmpv6_for_each_option(opt, &adv[1], end) { if (opt->type == ND_OPT_SOURCE_LINKADDR) { // Store address of source MAC-address - mac_ptr = opt->data; + mac_ptr = ((struct nd_opt_slla *)opt)->addr; } else if (opt->type == ND_OPT_RECURSIVE_DNS && opt->len > 1) { + struct nd_opt_recursive_dns *dns = (struct nd_opt_recursive_dns *)opt; // Check if we have to rewrite DNS - dns_ptr = (struct in6_addr*)&opt->data[6]; - dns_count = (opt->len - 1) / 2; + dns_ptr = (struct in6_addr *)&dns[1]; + dns_count = (dns->len - 1) / 2; } } diff --git a/src/router.h b/src/router.h index 1e8649c..8d74967 100644 --- a/src/router.h +++ b/src/router.h @@ -20,15 +20,25 @@ struct icmpv6_opt { uint8_t type; uint8_t len; - uint8_t data[6]; }; +struct nd_opt_slla { + uint8_t type; + uint8_t len; + uint8_t addr[6]; +}; + +struct nd_opt_recursive_dns { + uint8_t type; + uint8_t len; + uint8_t pad; + uint8_t pad2; + uint32_t lifetime; +}; #define icmpv6_for_each_option(opt, start, end)\ for (opt = (struct icmpv6_opt*)(start);\ - (void*)(opt + 1) <= (void*)(end) && opt->len > 0 &&\ - (void*)(opt + opt->len) <= (void*)(end); opt += opt->len) - + (void*)(opt + (opt->len << 3)) <= (void*)(end); opt += (opt->len << 3)) #define MaxRtrAdvInterval 600 #define MinRtrAdvInterval (MaxRtrAdvInterval / 3) -- 2.30.2