From ba87a9d8744d179dd7bc3a57cf8b1e506bcfae54 Mon Sep 17 00:00:00 2001 From: Benjamin Cama Date: Tue, 16 Aug 2011 16:06:33 +0200 Subject: [PATCH 1/1] Commiting the rework I have done until now. But I will remove the ack stuff, too complicated. Signed-off-by: Benjamin Cama --- l2tpns.c | 246 ++++++++++++++++++++++++++++++++----------------------- 1 file changed, 144 insertions(+), 102 deletions(-) diff --git a/l2tpns.c b/l2tpns.c index 7548771..d849711 100644 --- a/l2tpns.c +++ b/l2tpns.c @@ -577,10 +577,9 @@ static ssize_t netlink_recv(char *buf, ssize_t len) return recvmsg(nlfd, &msg, 0); } -static ssize_t netlink_check_ack(struct nlmsghdr *ack_nh, int msg_count) +static ssize_t netlink_check_ack(struct nlmsghdr *ack_nh, ssize_t len, int msg_count) { - ssize_t len; - uint32_t seqnum; + uint32_t seqnum = 0; // expect ack for (; NLMSG_OK (ack_nh, len); ack_nh = NLMSG_NEXT (ack_nh, len)) @@ -600,6 +599,9 @@ static ssize_t netlink_check_ack(struct nlmsghdr *ack_nh, int msg_count) --msg_count; if (errmsg->msg.nlmsg_seq > seqnum); seqnum = errmsg->msg.nlmsg_seq; + // if this is a single message, return now + if (!(ack_nh->nlmsg_flags & NLM_F_MULTI)) + return msg_count != 0 || seqnum != nlseqnum; } } else @@ -617,6 +619,8 @@ static void inittun(void) struct ifinfomsg ifinfo; struct ifreq ifr; char buf[4096]; + ssize_t len; + struct nlmsghdr *resp_nh; memset(&ifr, 0, sizeof(ifr)); ifr.ifr_flags = IFF_TUN; @@ -641,14 +645,12 @@ static void inittun(void) { // get the interface index - ssize_t len; struct { struct nlmsghdr nh; struct ifinfomsg ifinfo __attribute__ ((aligned(NLMSG_ALIGNTO))); struct rtattr ifname_rta __attribute__ ((aligned(RTA_ALIGNTO))); char ifname[IFNAMSIZ]; } req; - struct nlmsghdr *resp_nh; req.nh.nlmsg_type = RTM_GETLINK; req.nh.nlmsg_flags = NLM_F_REQUEST; @@ -659,6 +661,9 @@ static void inittun(void) req.ifname_rta.rta_type = IFLA_IFNAME; strncpy(req.ifname, config->tundevice, IFNAMSIZ-1); + req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifinfo) + + req.ifname_rta.rta_len); + if(netlink_send(&req.nh, 0) < 0 || (len = netlink_recv(buf, sizeof(buf))) < 0) { LOG(0, 0, 0, "Error getting tun ifindex: %s\n", strerror(errno)); @@ -666,151 +671,188 @@ static void inittun(void) } resp_nh = (struct nlmsghdr *)buf; - if (NLMSG_OK (resp_nh, len) && resp_nh->nlmsg_type == RTM_GETLINK) - { - memcpy(&ifinfo, NLMSG_DATA(resp_nh), sizeof(ifinfo)); - // got index - tunidx = ifinfo.ifi_index; - } - else + if (!NLMSG_OK (resp_nh, len)) { LOG(0, 0, 0, "Malformed answer getting tun ifindex\n"); exit(1); } + + memcpy(&ifinfo, NLMSG_DATA(resp_nh), sizeof(ifinfo)); + // got index + tunidx = ifinfo.ifi_index; } { ssize_t err; struct { // interface setting struct nlmsghdr nh; - struct ifinfomsg ifinfo __attribute__ ((aligned(NLMSG_ALIGNTO))); - struct rtattr txqlen_rta __attribute__ ((aligned(RTA_ALIGNTO))); - uint32_t txqlen; - struct rtattr mtu_rta __attribute__ ((aligned(RTA_ALIGNTO))); - uint32_t mtu; - - // IPv4 address - struct nlmsghdr addr_nh __attribute__ ((aligned(NLMSG_ALIGNTO))); - struct ifaddrmsg ifaddr __attribute__ ((aligned(NLMSG_ALIGNTO))); - struct rtattr addr_rta __attribute__ ((aligned(RTA_ALIGNTO))); - struct in_addr addr; - - // IPv6 LL address - struct nlmsghdr lladdr6_nh __attribute__ ((aligned(NLMSG_ALIGNTO))); - struct ifaddrmsg llifaddr6 __attribute__ ((aligned(NLMSG_ALIGNTO))); - struct rtattr lladdr6_rta __attribute__ ((aligned(RTA_ALIGNTO))); - struct in6_addr lladdr6; - - // IPv6 global address - struct nlmsghdr addr6_nh __attribute__ ((aligned(NLMSG_ALIGNTO))); - struct ifaddrmsg ifaddr6 __attribute__ ((aligned(NLMSG_ALIGNTO))); - struct rtattr addr6_rta __attribute__ ((aligned(RTA_ALIGNTO))); - struct in6_addr addr6; - - // end header - struct nlmsghdr end_nh __attribute__ ((aligned(NLMSG_ALIGNTO))); + union { + struct ifinfomsg ifinfo; + struct ifaddrmsg ifaddr; + } ifmsg __attribute__ ((aligned(NLMSG_ALIGNTO))); + char rtdata[32]; // 32 should be enough } req; - char buf[4096]; + struct { + struct rtattr rta; + uint32_t u32 __attribute__ ((aligned(RTA_ALIGNTO)));; + } u32_attr; + struct { + struct rtattr rta; + struct in_addr addr __attribute__ ((aligned(RTA_ALIGNTO)));; + } ipv4_attr; + struct { + struct rtattr rta; + struct in6_addr addr6 __attribute__ ((aligned(RTA_ALIGNTO)));; + } ipv6_attr; + char buf[256]; + ssize_t buf_len; + char *buf_ptr; memset(&req, 0, sizeof(req)); - req.nh.nlmsg_type = RTM_NEWLINK; - req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_REPLACE | NLM_F_MULTI; + req.nh.nlmsg_type = RTM_SETLINK; + req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_MULTI; - req.ifinfo = ifinfo; - req.ifinfo.ifi_flags |= IFF_UP; // set interface up - req.ifinfo.ifi_change = IFF_UP; // only change this flag + req.ifmsg.ifinfo = ifinfo; + req.ifmsg.ifinfo.ifi_flags |= IFF_UP; // set interface up + req.ifmsg.ifinfo.ifi_change = IFF_UP; // only change this flag - req.txqlen_rta.rta_len = RTA_LENGTH(sizeof(req.txqlen)); - req.txqlen_rta.rta_type = IFLA_TXQLEN; + buf_ptr = NLMSG_DATA(&req.nh) + sizeof(req.ifmsg.ifinfo); + + u32_attr.rta.rta_len = RTA_LENGTH(sizeof(u32_attr.u32)); + u32_attr.rta.rta_type = IFLA_TXQLEN; /* Bump up the qlen to deal with bursts from the network */ - req.txqlen = 1000; + u32_attr.u32 = 1000; + memcpy(buf_ptr, &u32_attr, sizeof(u32_attr)); + + buf_ptr += RTA_ALIGN(u32_attr.rta.rta_len); - req.mtu_rta.rta_len = RTA_LENGTH(sizeof(req.txqlen)); - req.mtu_rta.rta_type = IFLA_MTU; + u32_attr.rta.rta_len = RTA_LENGTH(sizeof(u32_attr.u32)); + u32_attr.rta.rta_type = IFLA_MTU; /* set MTU to modem MRU */ - req.mtu = MRU; + u32_attr.u32 = MRU; + memcpy(buf_ptr, &u32_attr, sizeof(u32_attr)); - req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifinfo) - + req.txqlen_rta.rta_len - + req.mtu_rta.rta_len); + req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifinfo) + + u32_attr.rta.rta_len * 2); + + if (netlink_send(&req.nh, 1) < 0) + { + LOG(0, 0, 0, "Error setting up tun device interface: %s\n", strerror(errno)); + exit(1); + } + + memset(&req, 0, sizeof(req)); - req.addr_nh.nlmsg_type = RTM_NEWADDR; - req.addr_nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_MULTI; + req.nh.nlmsg_type = RTM_NEWADDR; + req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_MULTI; - req.ifaddr.ifa_family = AF_INET; - req.ifaddr.ifa_prefixlen = 32; - req.ifaddr.ifa_index = ifinfo.ifi_index; + req.ifmsg.ifaddr.ifa_family = AF_INET; + req.ifmsg.ifaddr.ifa_prefixlen = 32; + req.ifmsg.ifaddr.ifa_index = ifinfo.ifi_index; - req.addr_rta.rta_len = RTA_LENGTH(sizeof(req.addr)); - req.addr_rta.rta_type = IFA_ADDRESS; - req.addr.s_addr = config->bind_address ? + ipv4_attr.rta.rta_len = RTA_LENGTH(sizeof(ipv4_attr.addr)); + ipv4_attr.rta.rta_type = IFA_ADDRESS; + ipv4_attr.addr.s_addr = config->bind_address ? config->bind_address : 0x01010101; // 1.1.1.1 + memcpy(NLMSG_DATA(&req.nh) + sizeof(req.ifmsg.ifaddr), &ipv4_attr, sizeof(ipv4_attr)); - req.addr_nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifaddr) - + req.addr_rta.rta_len); + req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr) + + ipv4_attr.rta.rta_len); + + if (netlink_send(&req.nh, 1) < 0) + { + LOG(0, 0, 0, "Error setting up tun device IPv4 address: %s\n", strerror(errno)); + exit(1); + } + + memset(&req, 0, sizeof(req)); // Only setup IPv6 on the tun device if we have a configured prefix if (config->ipv6_prefix.s6_addr[0]) { - req.lladdr6_nh.nlmsg_type = RTM_NEWADDR; - req.lladdr6_nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_MULTI; + req.nh.nlmsg_type = RTM_NEWADDR; + req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_MULTI; - req.llifaddr6.ifa_family = AF_INET6; - req.llifaddr6.ifa_prefixlen = 64; - req.llifaddr6.ifa_scope = RT_SCOPE_LINK; - req.llifaddr6.ifa_index = ifinfo.ifi_index; + req.ifmsg.ifaddr.ifa_family = AF_INET6; + req.ifmsg.ifaddr.ifa_prefixlen = 64; + req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_LINK; + req.ifmsg.ifaddr.ifa_index = ifinfo.ifi_index; - req.lladdr6_rta.rta_len = RTA_LENGTH(sizeof(req.lladdr6)); - req.lladdr6_rta.rta_type = IFA_LOCAL; + ipv6_attr.rta.rta_len = RTA_LENGTH(sizeof(ipv6_attr.addr6)); + ipv6_attr.rta.rta_type = IFA_LOCAL; // Link local address is FE80::1 - memset(&req.lladdr6, 0, sizeof(req.lladdr6)); - req.lladdr6.s6_addr[0] = 0xFE; - req.lladdr6.s6_addr[1] = 0x80; - req.lladdr6.s6_addr[15] = 1; + memset(&ipv6_attr.addr6, 0, sizeof(ipv6_attr.addr6)); + ipv6_attr.addr6.s6_addr[0] = 0xFE; + ipv6_attr.addr6.s6_addr[1] = 0x80; + ipv6_attr.addr6.s6_addr[15] = 1; + memcpy(NLMSG_DATA(&req.nh) + sizeof(req.ifmsg.ifaddr), &ipv6_attr, sizeof(ipv6_attr)); + + req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr) + + ipv6_attr.rta.rta_len); - req.lladdr6_nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifaddr) - + req.lladdr6_rta.rta_len); + if (netlink_send(&req.nh, 1) < 0) + { + LOG(0, 0, 0, "Error setting up tun device IPv6 LL address: %s\n", strerror(errno)); + exit(1); + } - req.addr6_nh.nlmsg_type = RTM_NEWADDR; - req.addr6_nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_MULTI; + memset(&req, 0, sizeof(req)); - req.ifaddr6.ifa_family = AF_INET6; - req.ifaddr6.ifa_prefixlen = 64; - req.ifaddr6.ifa_scope = RT_SCOPE_UNIVERSE; - req.ifaddr6.ifa_index = ifinfo.ifi_index; + req.nh.nlmsg_type = RTM_NEWADDR; + req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_MULTI; - req.addr6_rta.rta_len = RTA_LENGTH(sizeof(req.addr6)); - req.addr6_rta.rta_type = IFA_LOCAL; + req.ifmsg.ifaddr.ifa_family = AF_INET6; + req.ifmsg.ifaddr.ifa_prefixlen = 64; + req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_UNIVERSE; + req.ifmsg.ifaddr.ifa_index = ifinfo.ifi_index; + + ipv6_attr.rta.rta_len = RTA_LENGTH(sizeof(ipv6_attr.addr6)); + ipv6_attr.rta.rta_type = IFA_LOCAL; // Global address is prefix::1 - req.addr6 = config->ipv6_prefix; - req.addr6.s6_addr[15] = 1; + ipv6_attr.addr6 = config->ipv6_prefix; + ipv6_attr.addr6.s6_addr[15] = 1; + memcpy(NLMSG_DATA(&req.nh) + sizeof(req.ifmsg.ifaddr), &ipv6_attr, sizeof(ipv6_attr)); - req.lladdr6_nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifaddr) - + req.lladdr6_rta.rta_len); + req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr) + + ipv6_attr.rta.rta_len); - req.end_nh.nlmsg_type = NLMSG_DONE; - req.end_nh.nlmsg_len = NLMSG_LENGTH(0); - } - else - { - // we terminate at the beginning of IPv6 stuff - req.lladdr6_nh.nlmsg_type = NLMSG_DONE; - req.lladdr6_nh.nlmsg_len = NLMSG_LENGTH(0); + if (netlink_send(&req.nh, 1) < 0) + { + LOG(0, 0, 0, "Error setting up tun device IPv6 global address: %s\n", strerror(errno)); + exit(1); + } + + memset(&req, 0, sizeof(req)); } + req.nh.nlmsg_type = NLMSG_DONE; + req.nh.nlmsg_len = NLMSG_LENGTH(0); + if (netlink_send(&req.nh, 1) < 0) { - LOG(0, 0, 0, "Error setting up tun device: %s\n", strerror(errno)); + LOG(0, 0, 0, "Error finishing setting up tun device: %s\n", strerror(errno)); exit(1); } - if (netlink_recv(buf, sizeof(buf)) < 0) + buf_ptr = buf; + buf_len = sizeof(buf); + do { - LOG(0, 0, 0, "Error waiting ack for setting up tun device: %s\n", strerror(errno)); - exit(1); + len = netlink_recv(buf_ptr, sizeof(buf_len)); + if (len < 0) + { + LOG(0, 0, 0, "Error waiting for ack setting up tun device: %s\n", strerror(errno)); + exit(1); + } + + resp_nh = (struct nlmsghdr *)buf_ptr; + buf_len -= len; + buf_ptr += len; } + while (buf_len > 0 && (resp_nh->nlmsg_flags & NLM_F_MULTI) + && resp_nh->nlmsg_type != NLMSG_DONE); - if ((err = netlink_check_ack((struct nlmsghdr *)buf, 4))) + if ((err = netlink_check_ack((struct nlmsghdr *)buf, buf_len, 4))) { if (err < 0) LOG(0, 0, 0, "Error while receiving tun device ack: %s\n", strerror(errno)); -- 2.20.1