/* Pfinet option parsing Copyright (C) 1996, 1997, 2000, 2001, 2006, 2007 Free Software Foundation, Inc. Written by Miles Bader This file is part of the GNU Hurd. The GNU Hurd is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. The GNU Hurd is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include #include #include #include #include #include #include #include #include "pfinet.h" #include #include #include #include #include #include #include #include #include #include #include /* Our interface to the set of devices. */ extern error_t find_device (char *name, struct device **device); extern error_t enumerate_devices (error_t (*fun) (struct device *dev)); /* devinet.c */ extern error_t configure_device (struct device *dev, uint32_t addr, uint32_t netmask, uint32_t peer, uint32_t broadcast); extern void inquire_device (struct device *dev, uint32_t *addr, uint32_t *netmask, uint32_t *peer, uint32_t *broadcast); /* addrconf.c */ extern struct inet6_dev *ipv6_find_idev (struct device *dev); extern int inet6_addr_add (int ifindex, struct in6_addr *pfx, int plen); extern int inet6_addr_del (int ifindex, struct in6_addr *pfx, int plen); /* Pfinet options. Used for both startup and runtime. */ static const struct argp_option options[] = { {"interface", 'i', "DEVICE", 0, "Network interface to use", 1}, {0,0,0,0,"These apply to a given interface:", 2}, {"address", 'a', "ADDRESS", 0, "Set the network address"}, {"netmask", 'm', "MASK", 0, "Set the netmask"}, {"peer", 'p', "ADDRESS", 0, "Set the peer address"}, {"gateway", 'g', "ADDRESS", 0, "Set the default gateway"}, {"ipv4", '4', "NAME", 0, "Put active IPv4 translator on NAME"}, #ifdef CONFIG_IPV6 {"ipv6", '6', "NAME", 0, "Put active IPv6 translator on NAME"}, {"address6", 'A', "ADDR/LEN",0, "Set the global IPv6 address"}, {"gateway6", 'G', "ADDRESS", 0, "Set the IPv6 default gateway"}, #endif {"shutdown", 's', 0, 0, "Shut it down"}, {0} }; static const char doc[] = "Interface-specific options before the first \ interface specification apply to the first following interface; otherwise \ they apply to the previously specified interface."; /* Used to describe a particular interface during argument parsing. */ struct parse_interface { /* The network interface in question. */ struct device *device; /* New values to apply to it. (IPv4) */ uint32_t address, netmask, peer, gateway; #ifdef CONFIG_IPV6 /* New IPv6 configuration to apply. */ struct inet6_ifaddr address6; struct in6_addr gateway6; #endif }; /* Used to hold data during argument parsing. */ struct parse_hook { /* A list of specified interfaces and their corresponding options. */ struct parse_interface *interfaces; size_t num_interfaces; /* Interface to which options apply. If the device field isn't filled in then it should be by the next --interface option. */ struct parse_interface *curint; }; /* Adds an empty interface slot to H, and sets H's current interface to it, or returns an error. */ static error_t parse_hook_add_interface (struct parse_hook *h) { struct parse_interface *new = realloc (h->interfaces, (h->num_interfaces + 1) * sizeof (struct parse_interface)); if (! new) return ENOMEM; h->interfaces = new; h->num_interfaces++; h->curint = new + h->num_interfaces - 1; h->curint->device = 0; h->curint->address = INADDR_NONE; h->curint->netmask = INADDR_NONE; h->curint->peer = INADDR_NONE; h->curint->gateway = INADDR_NONE; #ifdef CONFIG_IPV6 memset (&h->curint->address6, 0, sizeof (struct inet6_ifaddr)); memset (&h->curint->gateway6, 0, sizeof (struct in6_addr)); #endif return 0; } static error_t parse_opt (int opt, char *arg, struct argp_state *state) { error_t err = 0; struct parse_hook *h = state->hook; /* Return _ERR from this routine, and in the special case of OPT being ARGP_KEY_SUCCESS, remember to free H first. */ #define RETURN(_err) \ do { if (opt == ARGP_KEY_SUCCESS) \ { err = (_err); goto free_hook; } \ else \ return _err; } while (0) /* Print a parsing error message and (if exiting is turned off) return the error code ERR. */ #define PERR(err, fmt, args...) \ do { argp_error (state, fmt , ##args); RETURN (err); } while (0) /* Like PERR but for non-parsing errors. */ #define FAIL(rerr, status, perr, fmt, args...) \ do{ argp_failure (state, status, perr, fmt , ##args); RETURN (rerr); } while(0) /* Parse STR and return the corresponding internet address. If STR is not a valid internet address, signal an error mentioned TYPE. */ #undef ADDR #define ADDR(str, type) \ ({ unsigned long addr = inet_addr (str); \ if (addr == INADDR_NONE) PERR (EINVAL, "Malformed %s", type); \ addr; }) switch (opt) { struct parse_interface *in; uint32_t gateway; #ifdef CONFIG_IPV6 struct parse_interface *gw6_in; char *ptr; #endif case 'i': /* An interface. */ err = 0; if (h->curint->device) /* The current interface slot is not available. */ { /* First see if a previously specified one is being re-specified. */ for (in = h->interfaces; in < h->interfaces + h->num_interfaces; in++) if (strcmp (in->device->name, arg) == 0) /* Re-use an old slot. */ { h->curint = in; return 0; } /* Add a new interface entry. */ err = parse_hook_add_interface (h); } in = h->curint; if (! err) err = find_device (arg, &in->device); if (err) FAIL (err, 10, err, "%s", arg); break; case 'a': h->curint->address = ADDR (arg, "address"); if (!IN_CLASSA (ntohl (h->curint->address)) && !IN_CLASSB (ntohl (h->curint->address)) && !IN_CLASSC (ntohl (h->curint->address))) { if (IN_MULTICAST (ntohl (h->curint->address))) FAIL (EINVAL, 1, 0, "%s: Cannot set interface address to multicast address", arg); else FAIL (EINVAL, 1, 0, "%s: Illegal or undefined network address", arg); } break; case 'm': h->curint->netmask = ADDR (arg, "netmask"); break; case 'p': h->curint->peer = ADDR (arg, "peer"); break; case 'g': h->curint->gateway = ADDR (arg, "gateway"); break; case '4': pfinet_bind (PORTCLASS_INET, arg); /* Install IPv6 port class on bootstrap port. */ pfinet_bootstrap_portclass = PORTCLASS_INET6; break; #ifdef CONFIG_IPV6 case '6': pfinet_bind (PORTCLASS_INET6, arg); break; case 'A': if ((ptr = strchr (arg, '/'))) { h->curint->address6.prefix_len = atoi (ptr + 1); if (h->curint->address6.prefix_len > 128) FAIL (EINVAL, 1, 0, "%s: The prefix-length is invalid", arg); *ptr = 0; } else { h->curint->address6.prefix_len = 64; fprintf (stderr, "No prefix-length given, defaulting to %s/64.\n", arg); } if (inet_pton (AF_INET6, arg, &h->curint->address6.addr) <= 0) PERR (EINVAL, "Malformed address"); if (IN6_IS_ADDR_MULTICAST (&h->curint->address6.addr)) FAIL (EINVAL, 1, 0, "%s: Cannot set interface address to " "multicast address", arg); break; case 'G': if (inet_pton (AF_INET6, arg, &h->curint->gateway6) <= 0) PERR (EINVAL, "Malformed gateway"); if (IN6_IS_ADDR_MULTICAST (&h->curint->gateway6)) FAIL (EINVAL, 1, 0, "%s: Cannot set gateway to " "multicast address", arg); break; #endif /* CONFIG_IPV6 */ case ARGP_KEY_INIT: /* Initialize our parsing state. */ h = malloc (sizeof (struct parse_hook)); if (! h) FAIL (ENOMEM, 11, ENOMEM, "option parsing"); h->interfaces = 0; h->num_interfaces = 0; err = parse_hook_add_interface (h); if (err) FAIL (err, 12, err, "option parsing"); state->hook = h; break; case ARGP_KEY_SUCCESS: in = h->curint; if (! in->device) /* No specific interface specified; is that ok? */ if (in->address != INADDR_NONE || in->netmask != INADDR_NONE || in->gateway != INADDR_NONE) /* Some options were specified, so we need an interface. See if there's a single extant interface to use as a default. */ { err = find_device (0, &in->device); if (err) FAIL (err, 13, 0, "No default interface"); } #if 0 /* XXX what does this mean??? */ /* Check for bogus option combinations. */ for (in = h->interfaces; in < h->interfaces + h->num_interfaces; in++) if (in->netmask != INADDR_NONE && in->address == INADDR_NONE && in->device->pa_addr == 0) /* Specifying a netmask for an address-less interface is a no-no. */ FAIL (EDESTADDRREQ, 14, 0, "Cannot set netmask"); #endif gateway = INADDR_NONE; #ifdef CONFIG_IPV6 gw6_in = NULL; #endif for (in = h->interfaces; in < h->interfaces + h->num_interfaces; in++) { if (in->gateway != INADDR_NONE) { if (gateway != INADDR_NONE) FAIL (err, 15, 0, "Cannot have multiple default gateways"); gateway = in->gateway; in->gateway = INADDR_NONE; } #ifdef CONFIG_IPV6 if (!IN6_IS_ADDR_UNSPECIFIED (&in->gateway6)) { if (gw6_in != NULL) FAIL (err, 15, 0, "Cannot have multiple IPv6 " "default gateways"); gw6_in = in; } #endif } /* Successfully finished parsing, return a result. */ __mutex_lock (&global_lock); for (in = h->interfaces; in < h->interfaces + h->num_interfaces; in++) { #ifdef CONFIG_IPV6 struct inet6_dev *idev = NULL; if (trivfs_protid_portclasses[PORTCLASS_INET6] != MACH_PORT_NULL && in->device) idev = ipv6_find_idev(in->device); #endif if (in->address != INADDR_NONE || in->netmask != INADDR_NONE) { err = configure_device (in->device, in->address, in->netmask, in->peer, INADDR_NONE); if (err) { __mutex_unlock (&global_lock); FAIL (err, 16, 0, "cannot configure interface"); } } #ifdef CONFIG_IPV6 if (!idev) continue; if (!IN6_IS_ADDR_UNSPECIFIED (&in->address6.addr)) { /* First let's remove all non-local addresses. */ struct inet6_ifaddr *ifa = idev->addr_list; do if (!IN6_IS_ADDR_LINKLOCAL (&ifa->addr) && !IN6_IS_ADDR_SITELOCAL (&ifa->addr)) inet6_addr_del (in->device->ifindex, &ifa->addr, ifa->prefix_len); while ((ifa = ifa->if_next)); /* Now assign the new address */ inet6_addr_add (in->device->ifindex, &in->address6.addr, in->address6.prefix_len); } #endif /* CONFIG_IPV6 */ } /* Set the default gateway. This code is cobbled together from what the SIOCADDRT ioctl code does, and from the apparent functionality of the "netlink" layer from perusing a little. */ { struct kern_rta rta; struct { struct nlmsghdr nlh; struct rtmsg rtm; } req; struct fib_table *tb; req.nlh.nlmsg_pid = 0; req.nlh.nlmsg_seq = 0; req.nlh.nlmsg_len = NLMSG_LENGTH (sizeof req.rtm); bzero (&req.rtm, sizeof req.rtm); bzero (&rta, sizeof rta); req.rtm.rtm_scope = RT_SCOPE_UNIVERSE; req.rtm.rtm_type = RTN_UNICAST; req.rtm.rtm_protocol = RTPROT_STATIC; rta.rta_gw = &gateway; if (gateway == INADDR_NONE) { /* Delete any existing default route. */ req.nlh.nlmsg_type = RTM_DELROUTE; req.nlh.nlmsg_flags = 0; tb = fib_get_table (req.rtm.rtm_table); if (tb) { err = - (*tb->tb_delete) (tb, &req.rtm, &rta, &req.nlh, 0); if (err && err != ESRCH) { __mutex_unlock (&global_lock); FAIL (err, 17, 0, "cannot remove old default gateway"); } err = 0; } } else { /* Add a default route, replacing any existing one. */ req.nlh.nlmsg_type = RTM_NEWROUTE; req.nlh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE; tb = fib_new_table (req.rtm.rtm_table); err = (!tb ? ENOBUFS : - (*tb->tb_insert) (tb, &req.rtm, &rta, &req.nlh, 0)); if (err) { __mutex_unlock (&global_lock); FAIL (err, 17, 0, "cannot set default gateway"); } } } /* Set IPv6 default router. */ #ifdef CONFIG_IPV6 if (trivfs_protid_portclasses[PORTCLASS_INET6] != MACH_PORT_NULL) { rt6_purge_dflt_routers (0); if (gw6_in) rt6_add_dflt_router (&gw6_in->gateway6, gw6_in->device); } #endif __mutex_unlock (&global_lock); /* Fall through to free hook. */ case ARGP_KEY_ERROR: /* Parsing error occured, free everything. */ free_hook: free (h->interfaces); free (h); break; default: return ARGP_ERR_UNKNOWN; } return err; } struct argp pfinet_argp = { options, parse_opt, 0, doc }; struct argp *trivfs_runtime_argp = &pfinet_argp; error_t trivfs_append_args (struct trivfs_control *fsys, char **argz, size_t *argz_len) { error_t add_dev_opts (struct device *dev) { error_t err = 0; uint32_t addr, mask, peer, broad; struct rt_key key = { 0 }; struct fib_result res; inquire_device (dev, &addr, &mask, &peer, &broad); #define ADD_OPT(fmt, args...) \ do { char buf[100]; \ if (! err) { \ snprintf (buf, sizeof buf, fmt , ##args); \ err = argz_add (argz, argz_len, buf); } } while (0) #define ADD_ADDR_OPT(name, addr) \ do { struct in_addr i; \ i.s_addr = (addr); \ ADD_OPT ("--%s=%s", name, inet_ntoa (i)); } while (0) ADD_OPT ("--interface=%s", dev->name); if (addr != INADDR_NONE) ADD_ADDR_OPT ("address", addr); if (mask != INADDR_NONE) ADD_ADDR_OPT ("netmask", mask); if (peer != addr) ADD_ADDR_OPT ("peer", peer); key.iif = dev->ifindex; if (! main_table->tb_lookup (main_table, &key, &res)) ADD_ADDR_OPT ("gateway", FIB_RES_GW (res)); #undef ADD_ADDR_OPT #ifdef CONFIG_IPV6 struct inet6_dev *idev = NULL; if (trivfs_protid_portclasses[PORTCLASS_INET6] != MACH_PORT_NULL) idev = ipv6_find_idev(dev); if (idev) { struct inet6_ifaddr *ifa = idev->addr_list; struct in6_addr daddr; static char addr_buf[INET6_ADDRSTRLEN]; /* Look for IPv6 default route (we use the first ifa->addr as source address), but don't yet push it to the option stack. */ memset (&daddr, 0, sizeof(daddr)); struct fib6_node *fib = fib6_lookup (&ip6_routing_table, &daddr, &ifa->addr); struct rt6_info *rt6i = fib->leaf; /* Push all IPv6 addresses assigned to the interface. */ do { inet_ntop (AF_INET6, &ifa->addr, addr_buf, INET6_ADDRSTRLEN); ADD_OPT ("--address6=%s/%d", addr_buf, ifa->prefix_len); } while ((ifa = ifa->if_next)); /* Last not least push --gateway6 option. */ if(rt6i->rt6i_dev == dev) { inet_ntop (AF_INET6, &rt6i->rt6i_gateway, addr_buf, INET6_ADDRSTRLEN); ADD_OPT ("--gateway6=%s", addr_buf); } } #endif /* CONFIG_IPV6 */ #undef ADD_OPT return err; } return enumerate_devices (add_dev_opts); }