diff options
Diffstat (limited to 'src/libsystemd/sd-netlink/netlink-util.c')
| -rw-r--r-- | src/libsystemd/sd-netlink/netlink-util.c | 421 |
1 files changed, 187 insertions, 234 deletions
diff --git a/src/libsystemd/sd-netlink/netlink-util.c b/src/libsystemd/sd-netlink/netlink-util.c index 832159a..9061609 100644 --- a/src/libsystemd/sd-netlink/netlink-util.c +++ b/src/libsystemd/sd-netlink/netlink-util.c @@ -11,6 +11,154 @@ #include "process-util.h" #include "strv.h" +static int parse_newlink_message( + sd_netlink_message *message, + char **ret_name, + char ***ret_altnames) { + + _cleanup_strv_free_ char **altnames = NULL; + int r, ifindex; + + assert(message); + + uint16_t type; + r = sd_netlink_message_get_type(message, &type); + if (r < 0) + return r; + if (type != RTM_NEWLINK) + return -EPROTO; + + r = sd_rtnl_message_link_get_ifindex(message, &ifindex); + if (r < 0) + return r; + if (ifindex <= 0) + return -EPROTO; + + if (ret_altnames) { + r = sd_netlink_message_read_strv(message, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &altnames); + if (r < 0 && r != -ENODATA) + return r; + } + + if (ret_name) { + r = sd_netlink_message_read_string_strdup(message, IFLA_IFNAME, ret_name); + if (r < 0) + return r; + } + + if (ret_altnames) + *ret_altnames = TAKE_PTR(altnames); + + return ifindex; +} + +int rtnl_get_ifname_full(sd_netlink **rtnl, int ifindex, char **ret_name, char ***ret_altnames) { + _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *message = NULL, *reply = NULL; + _cleanup_(sd_netlink_unrefp) sd_netlink *our_rtnl = NULL; + int r; + + assert(ifindex > 0); + + /* This is similar to if_indextoname(), but also optionally provides alternative names. */ + + if (!rtnl) + rtnl = &our_rtnl; + if (!*rtnl) { + r = sd_netlink_open(rtnl); + if (r < 0) + return r; + } + + r = sd_rtnl_message_new_link(*rtnl, &message, RTM_GETLINK, ifindex); + if (r < 0) + return r; + + r = sd_netlink_call(*rtnl, message, 0, &reply); + if (r < 0) + return r; + + return parse_newlink_message(reply, ret_name, ret_altnames); +} + +int rtnl_resolve_ifname_full( + sd_netlink **rtnl, + ResolveInterfaceNameFlag flags, + const char *name, + char **ret_name, + char ***ret_altnames) { + + _cleanup_(sd_netlink_unrefp) sd_netlink *our_rtnl = NULL; + int r; + + assert(name); + assert(flags > 0); + + /* This is similar to if_nametoindex(), but also resolves alternative names and decimal formatted + * ifindex too. Returns ifindex, and optionally provides the main interface name and alternative + * names.*/ + + if (!rtnl) + rtnl = &our_rtnl; + if (!*rtnl) { + r = sd_netlink_open(rtnl); + if (r < 0) + return r; + } + + /* First, use IFLA_IFNAME */ + if (FLAGS_SET(flags, RESOLVE_IFNAME_MAIN) && ifname_valid(name)) { + _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *message = NULL, *reply = NULL; + + r = sd_rtnl_message_new_link(*rtnl, &message, RTM_GETLINK, 0); + if (r < 0) + return r; + + r = sd_netlink_message_append_string(message, IFLA_IFNAME, name); + if (r < 0) + return r; + + r = sd_netlink_call(*rtnl, message, 0, &reply); + if (r >= 0) + return parse_newlink_message(reply, ret_name, ret_altnames); + if (r != -ENODEV) + return r; + } + + /* Next, try IFLA_ALT_IFNAME */ + if (FLAGS_SET(flags, RESOLVE_IFNAME_ALTERNATIVE) && + ifname_valid_full(name, IFNAME_VALID_ALTERNATIVE)) { + _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *message = NULL, *reply = NULL; + + r = sd_rtnl_message_new_link(*rtnl, &message, RTM_GETLINK, 0); + if (r < 0) + return r; + + r = sd_netlink_message_append_string(message, IFLA_ALT_IFNAME, name); + if (r < 0) + return r; + + r = sd_netlink_call(*rtnl, message, 0, &reply); + if (r >= 0) + return parse_newlink_message(reply, ret_name, ret_altnames); + /* The kernels older than 76c9ac0ee878f6693d398d3a95ccaf85e1f597a6 (v5.5) return -EINVAL. */ + if (!IN_SET(r, -ENODEV, -EINVAL)) + return r; + } + + /* Finally, assume the string is a decimal formatted ifindex. */ + if (FLAGS_SET(flags, RESOLVE_IFNAME_NUMERIC)) { + int ifindex; + + ifindex = parse_ifindex(name); + if (ifindex <= 0) + return -ENODEV; + + return rtnl_get_ifname_full(rtnl, ifindex, ret_name, ret_altnames); + } + + return -ENODEV; +} + static int set_link_name(sd_netlink **rtnl, int ifindex, const char *name) { _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *message = NULL; int r; @@ -20,6 +168,13 @@ static int set_link_name(sd_netlink **rtnl, int ifindex, const char *name) { assert(name); /* Assign the requested name. */ + + if (!*rtnl) { + r = sd_netlink_open(rtnl); + if (r < 0) + return r; + } + r = sd_rtnl_message_new_link(*rtnl, &message, RTM_SETLINK, ifindex); if (r < 0) return r; @@ -31,6 +186,37 @@ static int set_link_name(sd_netlink **rtnl, int ifindex, const char *name) { return sd_netlink_call(*rtnl, message, 0, NULL); } +int rtnl_rename_link(sd_netlink **rtnl, const char *orig_name, const char *new_name) { + _cleanup_(sd_netlink_unrefp) sd_netlink *our_rtnl = NULL; + int r, ifindex; + + assert(orig_name); + assert(new_name); + + /* This does not check alternative names. Callers must check the requested name is not used as an + * alternative name. */ + + if (streq(orig_name, new_name)) + return 0; + + if (!ifname_valid(new_name)) + return -EINVAL; + + if (!rtnl) + rtnl = &our_rtnl; + if (!*rtnl) { + r = sd_netlink_open(rtnl); + if (r < 0) + return r; + } + + ifindex = rtnl_resolve_ifname(rtnl, orig_name); + if (ifindex < 0) + return ifindex; + + return set_link_name(rtnl, ifindex, new_name); +} + int rtnl_set_link_name(sd_netlink **rtnl, int ifindex, const char *name, char* const *alternative_names) { _cleanup_strv_free_ char **original_altnames = NULL, **new_altnames = NULL; bool altname_deleted = false; @@ -204,38 +390,6 @@ int rtnl_set_link_properties( return 0; } -int rtnl_get_link_alternative_names(sd_netlink **rtnl, int ifindex, char ***ret) { - _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *message = NULL, *reply = NULL; - _cleanup_strv_free_ char **names = NULL; - int r; - - assert(rtnl); - assert(ifindex > 0); - assert(ret); - - if (!*rtnl) { - r = sd_netlink_open(rtnl); - if (r < 0) - return r; - } - - r = sd_rtnl_message_new_link(*rtnl, &message, RTM_GETLINK, ifindex); - if (r < 0) - return r; - - r = sd_netlink_call(*rtnl, message, 0, &reply); - if (r < 0) - return r; - - r = sd_netlink_message_read_strv(reply, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &names); - if (r < 0 && r != -ENODATA) - return r; - - *ret = TAKE_PTR(names); - - return 0; -} - static int rtnl_update_link_alternative_names( sd_netlink **rtnl, uint16_t nlmsg_type, @@ -336,92 +490,6 @@ int rtnl_set_link_alternative_names_by_ifname( return 0; } -int rtnl_resolve_link_alternative_name(sd_netlink **rtnl, const char *name, char **ret) { - _cleanup_(sd_netlink_unrefp) sd_netlink *our_rtnl = NULL; - _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *message = NULL, *reply = NULL; - int r, ifindex; - - assert(name); - - /* This returns ifindex and the main interface name. */ - - if (!ifname_valid_full(name, IFNAME_VALID_ALTERNATIVE)) - return -EINVAL; - - if (!rtnl) - rtnl = &our_rtnl; - if (!*rtnl) { - r = sd_netlink_open(rtnl); - if (r < 0) - return r; - } - - r = sd_rtnl_message_new_link(*rtnl, &message, RTM_GETLINK, 0); - if (r < 0) - return r; - - r = sd_netlink_message_append_string(message, IFLA_ALT_IFNAME, name); - if (r < 0) - return r; - - r = sd_netlink_call(*rtnl, message, 0, &reply); - if (r == -EINVAL) - return -ENODEV; /* The device doesn't exist */ - if (r < 0) - return r; - - r = sd_rtnl_message_link_get_ifindex(reply, &ifindex); - if (r < 0) - return r; - assert(ifindex > 0); - - if (ret) { - r = sd_netlink_message_read_string_strdup(reply, IFLA_IFNAME, ret); - if (r < 0) - return r; - } - - return ifindex; -} - -int rtnl_resolve_ifname(sd_netlink **rtnl, const char *name) { - int r; - - /* Like if_nametoindex, but resolves "alternative names" too. */ - - assert(name); - - r = if_nametoindex(name); - if (r > 0) - return r; - - return rtnl_resolve_link_alternative_name(rtnl, name, NULL); -} - -int rtnl_resolve_interface(sd_netlink **rtnl, const char *name) { - int r; - - /* Like rtnl_resolve_ifname, but resolves interface numbers too. */ - - assert(name); - - r = parse_ifindex(name); - if (r > 0) - return r; - assert(r < 0); - - return rtnl_resolve_ifname(rtnl, name); -} - -int rtnl_resolve_interface_or_warn(sd_netlink **rtnl, const char *name) { - int r; - - r = rtnl_resolve_interface(rtnl, name); - if (r < 0) - return log_error_errno(r, "Failed to resolve interface \"%s\": %m", name); - return r; -} - int rtnl_get_link_info( sd_netlink **rtnl, int ifindex, @@ -441,7 +509,7 @@ int rtnl_get_link_info( assert(rtnl); assert(ifindex > 0); - if (!ret_iftype && !ret_flags) + if (!ret_iftype && !ret_flags && !ret_kind && !ret_hw_addr && !ret_permanent_hw_addr) return 0; if (!*rtnl) { @@ -575,121 +643,6 @@ int rtattr_append_attribute(struct rtattr **rta, unsigned short type, const void return 0; } -MultipathRoute *multipath_route_free(MultipathRoute *m) { - if (!m) - return NULL; - - free(m->ifname); - - return mfree(m); -} - -int multipath_route_dup(const MultipathRoute *m, MultipathRoute **ret) { - _cleanup_(multipath_route_freep) MultipathRoute *n = NULL; - _cleanup_free_ char *ifname = NULL; - - assert(m); - assert(ret); - - if (m->ifname) { - ifname = strdup(m->ifname); - if (!ifname) - return -ENOMEM; - } - - n = new(MultipathRoute, 1); - if (!n) - return -ENOMEM; - - *n = (MultipathRoute) { - .gateway = m->gateway, - .weight = m->weight, - .ifindex = m->ifindex, - .ifname = TAKE_PTR(ifname), - }; - - *ret = TAKE_PTR(n); - - return 0; -} - -int rtattr_read_nexthop(const struct rtnexthop *rtnh, size_t size, int family, OrderedSet **ret) { - _cleanup_ordered_set_free_free_ OrderedSet *set = NULL; - int r; - - assert(rtnh); - assert(IN_SET(family, AF_INET, AF_INET6)); - - if (size < sizeof(struct rtnexthop)) - return -EBADMSG; - - for (; size >= sizeof(struct rtnexthop); ) { - _cleanup_(multipath_route_freep) MultipathRoute *m = NULL; - - if (NLMSG_ALIGN(rtnh->rtnh_len) > size) - return -EBADMSG; - - if (rtnh->rtnh_len < sizeof(struct rtnexthop)) - return -EBADMSG; - - m = new(MultipathRoute, 1); - if (!m) - return -ENOMEM; - - *m = (MultipathRoute) { - .ifindex = rtnh->rtnh_ifindex, - .weight = rtnh->rtnh_hops, - }; - - if (rtnh->rtnh_len > sizeof(struct rtnexthop)) { - size_t len = rtnh->rtnh_len - sizeof(struct rtnexthop); - - for (struct rtattr *attr = RTNH_DATA(rtnh); RTA_OK(attr, len); attr = RTA_NEXT(attr, len)) { - if (attr->rta_type == RTA_GATEWAY) { - if (attr->rta_len != RTA_LENGTH(FAMILY_ADDRESS_SIZE(family))) - return -EBADMSG; - - m->gateway.family = family; - memcpy(&m->gateway.address, RTA_DATA(attr), FAMILY_ADDRESS_SIZE(family)); - break; - } else if (attr->rta_type == RTA_VIA) { - uint16_t gw_family; - - if (family != AF_INET) - return -EINVAL; - - if (attr->rta_len < RTA_LENGTH(sizeof(uint16_t))) - return -EBADMSG; - - gw_family = *(uint16_t *) RTA_DATA(attr); - - if (gw_family != AF_INET6) - return -EBADMSG; - - if (attr->rta_len != RTA_LENGTH(FAMILY_ADDRESS_SIZE(gw_family) + sizeof(gw_family))) - return -EBADMSG; - - memcpy(&m->gateway, RTA_DATA(attr), FAMILY_ADDRESS_SIZE(gw_family) + sizeof(gw_family)); - break; - } - } - } - - r = ordered_set_ensure_put(&set, NULL, m); - if (r < 0) - return r; - - TAKE_PTR(m); - - size -= NLMSG_ALIGN(rtnh->rtnh_len); - rtnh = RTNH_NEXT(rtnh); - } - - if (ret) - *ret = TAKE_PTR(set); - return 0; -} - bool netlink_pid_changed(sd_netlink *nl) { /* We don't support people creating an nl connection and * keeping it around over a fork(). Let's complain. */ |