diff options
Diffstat (limited to 'net/mpls/af_mpls.c')
| -rw-r--r-- | net/mpls/af_mpls.c | 429 |
1 files changed, 333 insertions, 96 deletions
diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c index 7b05fd1497ce..bdcfb2d04cd2 100644 --- a/net/mpls/af_mpls.c +++ b/net/mpls/af_mpls.c @@ -684,6 +684,54 @@ errout: return err; } +static int nla_get_via(const struct nlattr *nla, u8 *via_alen, u8 *via_table, + u8 via_addr[], struct netlink_ext_ack *extack) +{ + struct rtvia *via = nla_data(nla); + int err = -EINVAL; + int alen; + + if (nla_len(nla) < offsetof(struct rtvia, rtvia_addr)) { + NL_SET_ERR_MSG_ATTR(extack, nla, + "Invalid attribute length for RTA_VIA"); + goto errout; + } + alen = nla_len(nla) - + offsetof(struct rtvia, rtvia_addr); + if (alen > MAX_VIA_ALEN) { + NL_SET_ERR_MSG_ATTR(extack, nla, + "Invalid address length for RTA_VIA"); + goto errout; + } + + /* Validate the address family */ + switch (via->rtvia_family) { + case AF_PACKET: + *via_table = NEIGH_LINK_TABLE; + break; + case AF_INET: + *via_table = NEIGH_ARP_TABLE; + if (alen != 4) + goto errout; + break; + case AF_INET6: + *via_table = NEIGH_ND_TABLE; + if (alen != 16) + goto errout; + break; + default: + /* Unsupported address family */ + goto errout; + } + + memcpy(via_addr, via->rtvia_addr, alen); + *via_alen = alen; + err = 0; + +errout: + return err; +} + static int mpls_nh_build_from_cfg(struct mpls_route_config *cfg, struct mpls_route *rt) { @@ -695,8 +743,6 @@ static int mpls_nh_build_from_cfg(struct mpls_route_config *cfg, if (!nh) return -ENOMEM; - err = -EINVAL; - nh->nh_labels = cfg->rc_output_labels; for (i = 0; i < nh->nh_labels; i++) nh->nh_label[i] = cfg->rc_output_label[i]; @@ -720,7 +766,8 @@ errout: static int mpls_nh_build(struct net *net, struct mpls_route *rt, struct mpls_nh *nh, int oif, struct nlattr *via, - struct nlattr *newdst, u8 max_labels) + struct nlattr *newdst, u8 max_labels, + struct netlink_ext_ack *extack) { int err = -ENOMEM; @@ -728,15 +775,15 @@ static int mpls_nh_build(struct net *net, struct mpls_route *rt, goto errout; if (newdst) { - err = nla_get_labels(newdst, max_labels, - &nh->nh_labels, nh->nh_label); + err = nla_get_labels(newdst, max_labels, &nh->nh_labels, + nh->nh_label, extack); if (err) goto errout; } if (via) { err = nla_get_via(via, &nh->nh_via_alen, &nh->nh_via_table, - __mpls_nh_via(rt, nh)); + __mpls_nh_via(rt, nh), extack); if (err) goto errout; } else { @@ -782,7 +829,8 @@ static u8 mpls_count_nexthops(struct rtnexthop *rtnh, int len, nla = nla_find(attrs, attrlen, RTA_NEWDST); if (nla && - nla_get_labels(nla, MAX_NEW_LABELS, &n_labels, NULL) != 0) + nla_get_labels(nla, MAX_NEW_LABELS, &n_labels, + NULL, NULL) != 0) return 0; *max_labels = max_t(u8, *max_labels, n_labels); @@ -802,7 +850,8 @@ static u8 mpls_count_nexthops(struct rtnexthop *rtnh, int len, } static int mpls_nh_build_multi(struct mpls_route_config *cfg, - struct mpls_route *rt, u8 max_labels) + struct mpls_route *rt, u8 max_labels, + struct netlink_ext_ack *extack) { struct rtnexthop *rtnh = cfg->rc_mp; struct nlattr *nla_via, *nla_newdst; @@ -836,7 +885,7 @@ static int mpls_nh_build_multi(struct mpls_route_config *cfg, err = mpls_nh_build(cfg->rc_nlinfo.nl_net, rt, nh, rtnh->rtnh_ifindex, nla_via, nla_newdst, - max_labels); + max_labels, extack); if (err) goto errout; @@ -855,7 +904,28 @@ errout: return err; } -static int mpls_route_add(struct mpls_route_config *cfg) +static bool mpls_label_ok(struct net *net, unsigned int index, + struct netlink_ext_ack *extack) +{ + /* Reserved labels may not be set */ + if (index < MPLS_LABEL_FIRST_UNRESERVED) { + NL_SET_ERR_MSG(extack, + "Invalid label - must be MPLS_LABEL_FIRST_UNRESERVED or higher"); + return false; + } + + /* The full 20 bit range may not be supported. */ + if (index >= net->mpls.platform_labels) { + NL_SET_ERR_MSG(extack, + "Label >= configured maximum in platform_labels"); + return false; + } + + return true; +} + +static int mpls_route_add(struct mpls_route_config *cfg, + struct netlink_ext_ack *extack) { struct mpls_route __rcu **platform_label; struct net *net = cfg->rc_nlinfo.nl_net; @@ -874,18 +944,15 @@ static int mpls_route_add(struct mpls_route_config *cfg) index = find_free_label(net); } - /* Reserved labels may not be set */ - if (index < MPLS_LABEL_FIRST_UNRESERVED) - goto errout; - - /* The full 20 bit range may not be supported. */ - if (index >= net->mpls.platform_labels) + if (!mpls_label_ok(net, index, extack)) goto errout; /* Append makes no sense with mpls */ err = -EOPNOTSUPP; - if (cfg->rc_nlflags & NLM_F_APPEND) + if (cfg->rc_nlflags & NLM_F_APPEND) { + NL_SET_ERR_MSG(extack, "MPLS does not support route append"); goto errout; + } err = -EEXIST; platform_label = rtnl_dereference(net->mpls.platform_label); @@ -912,8 +979,10 @@ static int mpls_route_add(struct mpls_route_config *cfg) nhs = 1; } - if (nhs == 0) + if (nhs == 0) { + NL_SET_ERR_MSG(extack, "Route does not contain a nexthop"); goto errout; + } err = -ENOMEM; rt = mpls_rt_alloc(nhs, max_via_alen, max_labels); @@ -927,7 +996,7 @@ static int mpls_route_add(struct mpls_route_config *cfg) rt->rt_ttl_propagate = cfg->rc_ttl_propagate; if (cfg->rc_mp) - err = mpls_nh_build_multi(cfg, rt, max_labels); + err = mpls_nh_build_multi(cfg, rt, max_labels, extack); else err = mpls_nh_build_from_cfg(cfg, rt); if (err) @@ -943,7 +1012,8 @@ errout: return err; } -static int mpls_route_del(struct mpls_route_config *cfg) +static int mpls_route_del(struct mpls_route_config *cfg, + struct netlink_ext_ack *extack) { struct net *net = cfg->rc_nlinfo.nl_net; unsigned index; @@ -951,12 +1021,7 @@ static int mpls_route_del(struct mpls_route_config *cfg) index = cfg->rc_label; - /* Reserved labels may not be removed */ - if (index < MPLS_LABEL_FIRST_UNRESERVED) - goto errout; - - /* The full 20 bit range may not be supported */ - if (index >= net->mpls.platform_labels) + if (!mpls_label_ok(net, index, extack)) goto errout; mpls_route_update(net, index, NULL, &cfg->rc_nlinfo); @@ -1541,8 +1606,8 @@ int nla_put_labels(struct sk_buff *skb, int attrtype, } EXPORT_SYMBOL_GPL(nla_put_labels); -int nla_get_labels(const struct nlattr *nla, - u8 max_labels, u8 *labels, u32 label[]) +int nla_get_labels(const struct nlattr *nla, u8 max_labels, u8 *labels, + u32 label[], struct netlink_ext_ack *extack) { unsigned len = nla_len(nla); struct mpls_shim_hdr *nla_label; @@ -1553,13 +1618,18 @@ int nla_get_labels(const struct nlattr *nla, /* len needs to be an even multiple of 4 (the label size). Number * of labels is a u8 so check for overflow. */ - if (len & 3 || len / 4 > 255) + if (len & 3 || len / 4 > 255) { + NL_SET_ERR_MSG_ATTR(extack, nla, + "Invalid length for labels attribute"); return -EINVAL; + } /* Limit the number of new labels allowed */ nla_labels = len/4; - if (nla_labels > max_labels) + if (nla_labels > max_labels) { + NL_SET_ERR_MSG(extack, "Too many labels"); return -EINVAL; + } /* when label == NULL, caller wants number of labels */ if (!label) @@ -1574,8 +1644,29 @@ int nla_get_labels(const struct nlattr *nla, /* Ensure the bottom of stack flag is properly set * and ttl and tc are both clear. */ - if ((dec.bos != bos) || dec.ttl || dec.tc) + if (dec.ttl) { + NL_SET_ERR_MSG_ATTR(extack, nla, + "TTL in label must be 0"); + return -EINVAL; + } + + if (dec.tc) { + NL_SET_ERR_MSG_ATTR(extack, nla, + "Traffic class in label must be 0"); + return -EINVAL; + } + + if (dec.bos != bos) { + NL_SET_BAD_ATTR(extack, nla); + if (bos) { + NL_SET_ERR_MSG(extack, + "BOS bit must be set in first label"); + } else { + NL_SET_ERR_MSG(extack, + "BOS bit can only be set in first label"); + } return -EINVAL; + } switch (dec.label) { case MPLS_LABEL_IMPLNULL: @@ -1583,6 +1674,8 @@ int nla_get_labels(const struct nlattr *nla, * assign and distribute, but which never * actually appears in the encapsulation. */ + NL_SET_ERR_MSG_ATTR(extack, nla, + "Implicit NULL Label (3) can not be used in encapsulation"); return -EINVAL; } @@ -1594,50 +1687,10 @@ out: } EXPORT_SYMBOL_GPL(nla_get_labels); -int nla_get_via(const struct nlattr *nla, u8 *via_alen, - u8 *via_table, u8 via_addr[]) -{ - struct rtvia *via = nla_data(nla); - int err = -EINVAL; - int alen; - - if (nla_len(nla) < offsetof(struct rtvia, rtvia_addr)) - goto errout; - alen = nla_len(nla) - - offsetof(struct rtvia, rtvia_addr); - if (alen > MAX_VIA_ALEN) - goto errout; - - /* Validate the address family */ - switch (via->rtvia_family) { - case AF_PACKET: - *via_table = NEIGH_LINK_TABLE; - break; - case AF_INET: - *via_table = NEIGH_ARP_TABLE; - if (alen != 4) - goto errout; - break; - case AF_INET6: - *via_table = NEIGH_ND_TABLE; - if (alen != 16) - goto errout; - break; - default: - /* Unsupported address family */ - goto errout; - } - - memcpy(via_addr, via->rtvia_addr, alen); - *via_alen = alen; - err = 0; - -errout: - return err; -} - -static int rtm_to_route_config(struct sk_buff *skb, struct nlmsghdr *nlh, - struct mpls_route_config *cfg) +static int rtm_to_route_config(struct sk_buff *skb, + struct nlmsghdr *nlh, + struct mpls_route_config *cfg, + struct netlink_ext_ack *extack) { struct rtmsg *rtm; struct nlattr *tb[RTA_MAX+1]; @@ -1645,35 +1698,54 @@ static int rtm_to_route_config(struct sk_buff *skb, struct nlmsghdr *nlh, int err; err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_mpls_policy, - NULL); + extack); if (err < 0) goto errout; err = -EINVAL; rtm = nlmsg_data(nlh); - if (rtm->rtm_family != AF_MPLS) + if (rtm->rtm_family != AF_MPLS) { + NL_SET_ERR_MSG(extack, "Invalid address family in rtmsg"); goto errout; - if (rtm->rtm_dst_len != 20) + } + if (rtm->rtm_dst_len != 20) { + NL_SET_ERR_MSG(extack, "rtm_dst_len must be 20 for MPLS"); goto errout; - if (rtm->rtm_src_len != 0) + } + if (rtm->rtm_src_len != 0) { + NL_SET_ERR_MSG(extack, "rtm_src_len must be 0 for MPLS"); goto errout; - if (rtm->rtm_tos != 0) + } + if (rtm->rtm_tos != 0) { + NL_SET_ERR_MSG(extack, "rtm_tos must be 0 for MPLS"); goto errout; - if (rtm->rtm_table != RT_TABLE_MAIN) + } + if (rtm->rtm_table != RT_TABLE_MAIN) { + NL_SET_ERR_MSG(extack, + "MPLS only supports the main route table"); goto errout; + } /* Any value is acceptable for rtm_protocol */ /* As mpls uses destination specific addresses * (or source specific address in the case of multicast) * all addresses have universal scope. */ - if (rtm->rtm_scope != RT_SCOPE_UNIVERSE) + if (rtm->rtm_scope != RT_SCOPE_UNIVERSE) { + NL_SET_ERR_MSG(extack, + "Invalid route scope - MPLS only supports UNIVERSE"); goto errout; - if (rtm->rtm_type != RTN_UNICAST) + } + if (rtm->rtm_type != RTN_UNICAST) { + NL_SET_ERR_MSG(extack, + "Invalid route type - MPLS only supports UNICAST"); goto errout; - if (rtm->rtm_flags != 0) + } + if (rtm->rtm_flags != 0) { + NL_SET_ERR_MSG(extack, "rtm_flags must be 0 for MPLS"); goto errout; + } cfg->rc_label = LABEL_NOT_SPECIFIED; cfg->rc_protocol = rtm->rtm_protocol; @@ -1696,26 +1768,26 @@ static int rtm_to_route_config(struct sk_buff *skb, struct nlmsghdr *nlh, case RTA_NEWDST: if (nla_get_labels(nla, MAX_NEW_LABELS, &cfg->rc_output_labels, - cfg->rc_output_label)) + cfg->rc_output_label, extack)) goto errout; break; case RTA_DST: { u8 label_count; if (nla_get_labels(nla, 1, &label_count, - &cfg->rc_label)) + &cfg->rc_label, extack)) goto errout; - /* Reserved labels may not be set */ - if (cfg->rc_label < MPLS_LABEL_FIRST_UNRESERVED) + if (!mpls_label_ok(cfg->rc_nlinfo.nl_net, + cfg->rc_label, extack)) goto errout; - break; } case RTA_VIA: { if (nla_get_via(nla, &cfg->rc_via_alen, - &cfg->rc_via_table, cfg->rc_via)) + &cfg->rc_via_table, cfg->rc_via, + extack)) goto errout; break; } @@ -1729,14 +1801,18 @@ static int rtm_to_route_config(struct sk_buff *skb, struct nlmsghdr *nlh, { u8 ttl_propagate = nla_get_u8(nla); - if (ttl_propagate > 1) + if (ttl_propagate > 1) { + NL_SET_ERR_MSG_ATTR(extack, nla, + "RTA_TTL_PROPAGATE can only be 0 or 1"); goto errout; + } cfg->rc_ttl_propagate = ttl_propagate ? MPLS_TTL_PROP_ENABLED : MPLS_TTL_PROP_DISABLED; break; } default: + NL_SET_ERR_MSG_ATTR(extack, nla, "Unknown attribute"); /* Unsupported attribute */ goto errout; } @@ -1757,11 +1833,11 @@ static int mpls_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, if (!cfg) return -ENOMEM; - err = rtm_to_route_config(skb, nlh, cfg); + err = rtm_to_route_config(skb, nlh, cfg, extack); if (err < 0) goto out; - err = mpls_route_del(cfg); + err = mpls_route_del(cfg, extack); out: kfree(cfg); @@ -1779,11 +1855,11 @@ static int mpls_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, if (!cfg) return -ENOMEM; - err = rtm_to_route_config(skb, nlh, cfg); + err = rtm_to_route_config(skb, nlh, cfg, extack); if (err < 0) goto out; - err = mpls_route_add(cfg); + err = mpls_route_add(cfg, extack); out: kfree(cfg); @@ -1995,6 +2071,166 @@ errout: rtnl_set_sk_err(net, RTNLGRP_MPLS_ROUTE, err); } +static int mpls_getroute(struct sk_buff *in_skb, struct nlmsghdr *in_nlh, + struct netlink_ext_ack *extack) +{ + struct net *net = sock_net(in_skb->sk); + u32 portid = NETLINK_CB(in_skb).portid; + struct nlattr *tb[RTA_MAX + 1]; + u32 labels[MAX_NEW_LABELS]; + struct mpls_shim_hdr *hdr; + unsigned int hdr_size = 0; + struct net_device *dev; + struct mpls_route *rt; + struct rtmsg *rtm, *r; + struct nlmsghdr *nlh; + struct sk_buff *skb; + struct mpls_nh *nh; + int err = -EINVAL; + u32 in_label; + u8 n_labels; + + err = nlmsg_parse(in_nlh, sizeof(*rtm), tb, RTA_MAX, + rtm_mpls_policy, extack); + if (err < 0) + goto errout; + + rtm = nlmsg_data(in_nlh); + + if (tb[RTA_DST]) { + u8 label_count; + + if (nla_get_labels(tb[RTA_DST], 1, &label_count, + &in_label, extack)) + goto errout; + + if (in_label < MPLS_LABEL_FIRST_UNRESERVED) + goto errout; + } + + rt = mpls_route_input_rcu(net, in_label); + if (!rt) { + err = -ENETUNREACH; + goto errout; + } + + if (rtm->rtm_flags & RTM_F_FIB_MATCH) { + skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL); + if (!skb) { + err = -ENOBUFS; + goto errout; + } + + err = mpls_dump_route(skb, portid, in_nlh->nlmsg_seq, + RTM_NEWROUTE, in_label, rt, 0); + if (err < 0) { + /* -EMSGSIZE implies BUG in lfib_nlmsg_size */ + WARN_ON(err == -EMSGSIZE); + goto errout_free; + } + + return rtnl_unicast(skb, net, portid); + } + + if (tb[RTA_NEWDST]) { + if (nla_get_labels(tb[RTA_NEWDST], MAX_NEW_LABELS, &n_labels, + labels, extack) != 0) { + err = -EINVAL; + goto errout; + } + + hdr_size = n_labels * sizeof(struct mpls_shim_hdr); + } + + skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); + if (!skb) { + err = -ENOBUFS; + goto errout; + } + + skb->protocol = htons(ETH_P_MPLS_UC); + + if (hdr_size) { + bool bos; + int i; + + if (skb_cow(skb, hdr_size)) { + err = -ENOBUFS; + goto errout_free; + } + + skb_reserve(skb, hdr_size); + skb_push(skb, hdr_size); + skb_reset_network_header(skb); + + /* Push new labels */ + hdr = mpls_hdr(skb); + bos = true; + for (i = n_labels - 1; i >= 0; i--) { + hdr[i] = mpls_entry_encode(labels[i], + 1, 0, bos); + bos = false; + } + } + + nh = mpls_select_multipath(rt, skb); + if (!nh) { + err = -ENETUNREACH; + goto errout_free; + } + + if (hdr_size) { + skb_pull(skb, hdr_size); + skb_reset_network_header(skb); + } + + nlh = nlmsg_put(skb, portid, in_nlh->nlmsg_seq, + RTM_NEWROUTE, sizeof(*r), 0); + if (!nlh) { + err = -EMSGSIZE; + goto errout_free; + } + + r = nlmsg_data(nlh); + r->rtm_family = AF_MPLS; + r->rtm_dst_len = 20; + r->rtm_src_len = 0; + r->rtm_table = RT_TABLE_MAIN; + r->rtm_type = RTN_UNICAST; + r->rtm_scope = RT_SCOPE_UNIVERSE; + r->rtm_protocol = rt->rt_protocol; + r->rtm_flags = 0; + + if (nla_put_labels(skb, RTA_DST, 1, &in_label)) + goto nla_put_failure; + + if (nh->nh_labels && + nla_put_labels(skb, RTA_NEWDST, nh->nh_labels, + nh->nh_label)) + goto nla_put_failure; + + if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && + nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh), + nh->nh_via_alen)) + goto nla_put_failure; + dev = rtnl_dereference(nh->nh_dev); + if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex)) + goto nla_put_failure; + + nlmsg_end(skb, nlh); + + err = rtnl_unicast(skb, net, portid); +errout: + return err; + +nla_put_failure: + nlmsg_cancel(skb, nlh); + err = -EMSGSIZE; +errout_free: + kfree_skb(skb); + return err; +} + static int resize_platform_label_table(struct net *net, size_t limit) { size_t size = sizeof(struct mpls_route *) * limit; @@ -2241,7 +2477,8 @@ static int __init mpls_init(void) rtnl_register(PF_MPLS, RTM_NEWROUTE, mpls_rtm_newroute, NULL, NULL); rtnl_register(PF_MPLS, RTM_DELROUTE, mpls_rtm_delroute, NULL, NULL); - rtnl_register(PF_MPLS, RTM_GETROUTE, NULL, mpls_dump_routes, NULL); + rtnl_register(PF_MPLS, RTM_GETROUTE, mpls_getroute, mpls_dump_routes, + NULL); rtnl_register(PF_MPLS, RTM_GETNETCONF, mpls_netconf_get_devconf, mpls_netconf_dump_devconf, NULL); err = 0; |