X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/7c474381d4dcc23b9fb4d3a2401971a9ef79c889..31fd6f10555f8e0905764870f7f9bfc26a84df6e:/l2tpns.c?ds=sidebyside diff --git a/l2tpns.c b/l2tpns.c index f530955..5545aed 100644 --- a/l2tpns.c +++ b/l2tpns.c @@ -14,7 +14,6 @@ char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.176 2011/01/20 12:48:40 bodea Exp #define SYSLOG_NAMES #include #include -#include #include #include #include @@ -31,7 +30,7 @@ char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.176 2011/01/20 12:48:40 bodea Exp #include #include #include -#include +#include #include #include #include @@ -200,6 +199,8 @@ struct Tstats *_statistics = NULL; struct Tringbuffer *ringbuffer = NULL; #endif +static ssize_t netlink_send(struct nlmsghdr *nh); +static void netlink_addattr(struct nlmsghdr *nh, int type, const void *data, int alen); static void cache_ipmap(in_addr_t ip, sessionidt s); static void uncache_ipmap(in_addr_t ip); static void cache_ipv6map(struct in6_addr ip, int prefixlen, sessionidt s); @@ -423,36 +424,51 @@ void random_data(uint8_t *buf, int len) // static void routeset(sessionidt s, in_addr_t ip, int prefixlen, in_addr_t gw, int add) { - struct rtentry r; - in_addr_t mask; + struct { + struct nlmsghdr nh; + struct rtmsg rt; + char buf[32]; + } req; int i; + in_addr_t n_ip; if (!prefixlen) prefixlen = 32; - mask = 0xffffffff << (32 - prefixlen); + ip &= 0xffffffff << (32 - prefixlen);; // Force the ip to be the first one in the route. - ip &= mask; // Force the ip to be the first one in the route. + memset(&req, 0, sizeof(req)); - memset(&r, 0, sizeof(r)); - r.rt_dev = config->tundevice; - r.rt_dst.sa_family = AF_INET; - *(uint32_t *) & (((struct sockaddr_in *) &r.rt_dst)->sin_addr.s_addr) = htonl(ip); - r.rt_gateway.sa_family = AF_INET; - *(uint32_t *) & (((struct sockaddr_in *) &r.rt_gateway)->sin_addr.s_addr) = htonl(gw); - r.rt_genmask.sa_family = AF_INET; - *(uint32_t *) & (((struct sockaddr_in *) &r.rt_genmask)->sin_addr.s_addr) = htonl(mask); - r.rt_flags = (RTF_UP | RTF_STATIC); + if (add) + { + req.nh.nlmsg_type = RTM_NEWROUTE; + req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE; + } + else + req.nh.nlmsg_type = RTM_DELROUTE; + req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.rt)); + + req.rt.rtm_family = AF_INET; + req.rt.rtm_dst_len = prefixlen; + req.rt.rtm_table = RT_TABLE_MAIN; + req.rt.rtm_protocol = RTPROT_BOOT; // XXX + req.rt.rtm_scope = RT_SCOPE_LINK; + req.rt.rtm_type = RTN_UNICAST; + + netlink_addattr(&req.nh, RTA_OIF, &tunidx, sizeof(int)); + n_ip = htonl(ip); + netlink_addattr(&req.nh, RTA_DST, &n_ip, sizeof(n_ip)); if (gw) - r.rt_flags |= RTF_GATEWAY; - else if (prefixlen == 32) - r.rt_flags |= RTF_HOST; + { + n_ip = htonl(gw); + netlink_addattr(&req.nh, RTA_GATEWAY, &n_ip, sizeof(n_ip)); + } LOG(1, s, 0, "Route %s %s/%d%s%s\n", add ? "add" : "del", fmtaddr(htonl(ip), 0), prefixlen, gw ? " via" : "", gw ? fmtaddr(htonl(gw), 2) : ""); - if (ioctl(ifrfd, add ? SIOCADDRT : SIOCDELRT, (void *) &r) < 0) - LOG(0, 0, 0, "routeset() error in ioctl: %s\n", strerror(errno)); + if (netlink_send(&req.nh) < 0) + LOG(0, 0, 0, "routeset() error in sending netlink message: %s\n", strerror(errno)); #ifdef BGP if (add) @@ -481,31 +497,50 @@ static void routeset(sessionidt s, in_addr_t ip, int prefixlen, in_addr_t gw, in void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add) { - struct in6_rtmsg rt; + struct { + struct nlmsghdr nh; + struct rtmsg rt; + char buf[64]; + } req; + int metric; char ipv6addr[INET6_ADDRSTRLEN]; - if (ifr6fd < 0) + if (!config->ipv6_prefix.s6_addr[0]) { LOG(0, 0, 0, "Asked to set IPv6 route, but IPv6 not setup.\n"); return; } - memset(&rt, 0, sizeof(rt)); + memset(&req, 0, sizeof(req)); + + if (add) + { + req.nh.nlmsg_type = RTM_NEWROUTE; + req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE; + } + else + req.nh.nlmsg_type = RTM_DELROUTE; + req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.rt)); + + req.rt.rtm_family = AF_INET6; + req.rt.rtm_dst_len = prefixlen; + req.rt.rtm_table = RT_TABLE_MAIN; + req.rt.rtm_protocol = RTPROT_BOOT; // XXX + req.rt.rtm_scope = RT_SCOPE_LINK; + req.rt.rtm_type = RTN_UNICAST; - memcpy(&rt.rtmsg_dst, &ip, sizeof(struct in6_addr)); - rt.rtmsg_dst_len = prefixlen; - rt.rtmsg_metric = 1; - rt.rtmsg_flags = RTF_UP; - rt.rtmsg_ifindex = tunidx; + netlink_addattr(&req.nh, RTA_OIF, &tunidx, sizeof(int)); + netlink_addattr(&req.nh, RTA_DST, &ip, sizeof(ip)); + metric = 1; + netlink_addattr(&req.nh, RTA_METRICS, &metric, sizeof(metric)); LOG(1, 0, 0, "Route %s %s/%d\n", add ? "add" : "del", inet_ntop(AF_INET6, &ip, ipv6addr, INET6_ADDRSTRLEN), prefixlen); - if (ioctl(ifr6fd, add ? SIOCADDRT : SIOCDELRT, (void *) &rt) < 0) - LOG(0, 0, 0, "route6set() error in ioctl: %s\n", - strerror(errno)); + if (netlink_send(&req.nh) < 0) + LOG(0, 0, 0, "route6set() error in sending netlink message: %s\n", strerror(errno)); // FIXME: need to add BGP routing (RFC2858) @@ -580,7 +615,7 @@ static ssize_t netlink_recv(void *buf, ssize_t len) } /* adapted from iproute2 */ -void netlink_addattr(struct nlmsghdr *nh, int type, const void *data, int alen) +static void netlink_addattr(struct nlmsghdr *nh, int type, const void *data, int alen) { int len = RTA_LENGTH(alen); struct rtattr *rta; @@ -606,7 +641,6 @@ static char *tun_nl_phase_msg[] = { // Set up TUN interface static void inittun(void) { - struct ifinfomsg ifinfo; struct ifreq ifr; memset(&ifr, 0, sizeof(ifr)); @@ -630,43 +664,13 @@ static void inittun(void) assert(strlen(ifr.ifr_name) < sizeof(config->tundevice) - 1); strncpy(config->tundevice, ifr.ifr_name, sizeof(config->tundevice)); + tunidx = if_nametoindex(config->tundevice); + if (tunidx == 0) { - // get the interface index - struct { - struct nlmsghdr nh; - struct ifinfomsg ifinfo __attribute__ ((aligned(NLMSG_ALIGNTO))); - struct rtattr ifname_rta __attribute__ ((aligned(RTA_ALIGNTO))); - char ifname[IFNAMSIZ]; - } req; - char buf[4096]; - ssize_t len; - struct nlmsghdr *resp_nh; - - req.nh.nlmsg_type = RTM_GETLINK; - req.nh.nlmsg_flags = NLM_F_REQUEST; - req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifinfo)); - - req.ifinfo.ifi_family = AF_UNSPEC; // as the man says - - netlink_addattr(&req.nh, IFLA_IFNAME, config->tundevice, strlen(config->tundevice)+1); - - if(netlink_send(&req.nh) < 0 || (len = netlink_recv(buf, sizeof(buf))) < 0) - { - LOG(0, 0, 0, "Error getting tun ifindex: %s\n", strerror(errno)); - exit(1); - } - - resp_nh = (struct nlmsghdr *)buf; - if (!NLMSG_OK (resp_nh, len)) - { - LOG(0, 0, 0, "Malformed answer getting tun ifindex %ld\n", len); - exit(1); - } - - memcpy(&ifinfo, NLMSG_DATA(resp_nh), sizeof(ifinfo)); - // got index - tunidx = ifinfo.ifi_index; + LOG(0, 0, 0, "Can't get tun interface index\n"); + exit(1); } + { struct { // interface setting @@ -674,19 +678,20 @@ static void inittun(void) union { struct ifinfomsg ifinfo; struct ifaddrmsg ifaddr; - } ifmsg __attribute__ ((aligned(NLMSG_ALIGNTO))); + } ifmsg; char rtdata[32]; // 32 should be enough } req; uint32_t txqlen, mtu; - struct in_addr ip; + in_addr_t ip; memset(&req, 0, sizeof(req)); - req.nh.nlmsg_type = RTM_SETLINK; + req.nh.nlmsg_type = RTM_NEWLINK; req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_MULTI; req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifinfo)); - req.ifmsg.ifinfo = ifinfo; + req.ifmsg.ifinfo.ifi_family = AF_UNSPEC; + req.ifmsg.ifinfo.ifi_index = tunidx; req.ifmsg.ifinfo.ifi_flags |= IFF_UP; // set interface up req.ifmsg.ifinfo.ifi_change = IFF_UP; // only change this flag @@ -703,17 +708,18 @@ static void inittun(void) memset(&req, 0, sizeof(req)); req.nh.nlmsg_type = RTM_NEWADDR; - req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_MULTI; + req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE | NLM_F_MULTI; req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr)); req.ifmsg.ifaddr.ifa_family = AF_INET; req.ifmsg.ifaddr.ifa_prefixlen = 32; - req.ifmsg.ifaddr.ifa_index = ifinfo.ifi_index; + req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_UNIVERSE; + req.ifmsg.ifaddr.ifa_index = tunidx; if (config->bind_address) - ip.s_addr = config->bind_address; + ip = config->bind_address; else - ip.s_addr = 0x01010101, // 1.1.1.1 + ip = 0x01010101; // 1.1.1.1 netlink_addattr(&req.nh, IFA_LOCAL, &ip, sizeof(ip)); if (netlink_send(&req.nh) < 0) @@ -726,13 +732,13 @@ static void inittun(void) memset(&req, 0, sizeof(req)); req.nh.nlmsg_type = RTM_NEWADDR; - req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_MULTI; + req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE | NLM_F_MULTI; req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr)); 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.ifmsg.ifaddr.ifa_index = tunidx; // Link local address is FE80::1 memset(&ip6, 0, sizeof(ip6)); @@ -747,13 +753,13 @@ static void inittun(void) memset(&req, 0, sizeof(req)); req.nh.nlmsg_type = RTM_NEWADDR; - req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_MULTI; + req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE | NLM_F_MULTI; req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr)); 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; + req.ifmsg.ifaddr.ifa_index = tunidx; // Global address is prefix::1 ip6 = config->ipv6_prefix;