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https://github.com/FEX-Emu/linux.git
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net: mpls: bump maximum number of labels
Allow users to push down more labels per MPLS route. With the previous patches, no memory allocations are based on MAX_NEW_LABELS; the limit is only used to keep userspace in check. At this point MAX_NEW_LABELS is only used for mpls_route_config (copying route data from userspace) and processing nexthops looking for the max number of labels across the route spec. Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern
David S. Miller
parent
df1c631648
commit
a4ac8c986d
@ -24,7 +24,10 @@
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#include <net/nexthop.h>
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#include "internal.h"
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#define MAX_NEW_LABELS 2
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/* put a reasonable limit on the number of labels
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* we will accept from userspace
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*/
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#define MAX_NEW_LABELS 30
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/* max memory we will use for mpls_route */
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#define MAX_MPLS_ROUTE_MEM 4096
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@ -698,9 +701,6 @@ static int mpls_nh_build_from_cfg(struct mpls_route_config *cfg,
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return -ENOMEM;
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err = -EINVAL;
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/* Ensure only a supported number of labels are present */
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if (cfg->rc_output_labels > MAX_NEW_LABELS)
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goto errout;
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nh->nh_labels = cfg->rc_output_labels;
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for (i = 0; i < nh->nh_labels; i++)
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@ -725,7 +725,7 @@ errout:
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static int mpls_nh_build(struct net *net, struct mpls_route *rt,
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struct mpls_nh *nh, int oif, struct nlattr *via,
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struct nlattr *newdst)
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struct nlattr *newdst, u8 max_labels)
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{
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int err = -ENOMEM;
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@ -733,7 +733,7 @@ static int mpls_nh_build(struct net *net, struct mpls_route *rt,
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goto errout;
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if (newdst) {
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err = nla_get_labels(newdst, MAX_NEW_LABELS,
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err = nla_get_labels(newdst, max_labels,
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&nh->nh_labels, nh->nh_label);
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if (err)
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goto errout;
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@ -759,21 +759,19 @@ errout:
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}
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static u8 mpls_count_nexthops(struct rtnexthop *rtnh, int len,
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u8 cfg_via_alen, u8 *max_via_alen)
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u8 cfg_via_alen, u8 *max_via_alen,
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u8 *max_labels)
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{
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int remaining = len;
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u8 nhs = 0;
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if (!rtnh) {
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*max_via_alen = cfg_via_alen;
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return 1;
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}
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*max_via_alen = 0;
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*max_labels = 0;
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while (rtnh_ok(rtnh, remaining)) {
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struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
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int attrlen;
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u8 n_labels = 0;
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attrlen = rtnh_attrlen(rtnh);
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nla = nla_find(attrs, attrlen, RTA_VIA);
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@ -787,6 +785,13 @@ static u8 mpls_count_nexthops(struct rtnexthop *rtnh, int len,
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via_alen);
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}
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nla = nla_find(attrs, attrlen, RTA_NEWDST);
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if (nla &&
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nla_get_labels(nla, MAX_NEW_LABELS, &n_labels, NULL) != 0)
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return 0;
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*max_labels = max_t(u8, *max_labels, n_labels);
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/* number of nexthops is tracked by a u8.
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* Check for overflow.
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*/
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@ -802,7 +807,7 @@ static u8 mpls_count_nexthops(struct rtnexthop *rtnh, int len,
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}
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static int mpls_nh_build_multi(struct mpls_route_config *cfg,
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struct mpls_route *rt)
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struct mpls_route *rt, u8 max_labels)
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{
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struct rtnexthop *rtnh = cfg->rc_mp;
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struct nlattr *nla_via, *nla_newdst;
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@ -835,7 +840,8 @@ static int mpls_nh_build_multi(struct mpls_route_config *cfg,
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}
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err = mpls_nh_build(cfg->rc_nlinfo.nl_net, rt, nh,
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rtnh->rtnh_ifindex, nla_via, nla_newdst);
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rtnh->rtnh_ifindex, nla_via, nla_newdst,
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max_labels);
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if (err)
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goto errout;
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@ -862,6 +868,7 @@ static int mpls_route_add(struct mpls_route_config *cfg)
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int err = -EINVAL;
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u8 max_via_alen;
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unsigned index;
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u8 max_labels;
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u8 nhs;
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index = cfg->rc_label;
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@ -900,13 +907,21 @@ static int mpls_route_add(struct mpls_route_config *cfg)
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goto errout;
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err = -EINVAL;
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nhs = mpls_count_nexthops(cfg->rc_mp, cfg->rc_mp_len,
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cfg->rc_via_alen, &max_via_alen);
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if (cfg->rc_mp) {
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nhs = mpls_count_nexthops(cfg->rc_mp, cfg->rc_mp_len,
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cfg->rc_via_alen, &max_via_alen,
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&max_labels);
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} else {
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max_via_alen = cfg->rc_via_alen;
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max_labels = cfg->rc_output_labels;
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nhs = 1;
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}
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if (nhs == 0)
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goto errout;
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err = -ENOMEM;
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rt = mpls_rt_alloc(nhs, max_via_alen, MAX_NEW_LABELS);
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rt = mpls_rt_alloc(nhs, max_via_alen, max_labels);
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if (IS_ERR(rt)) {
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err = PTR_ERR(rt);
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goto errout;
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@ -917,7 +932,7 @@ static int mpls_route_add(struct mpls_route_config *cfg)
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rt->rt_ttl_propagate = cfg->rc_ttl_propagate;
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if (cfg->rc_mp)
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err = mpls_nh_build_multi(cfg, rt);
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err = mpls_nh_build_multi(cfg, rt, max_labels);
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else
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err = mpls_nh_build_from_cfg(cfg, rt);
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if (err)
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@ -1531,16 +1546,18 @@ int nla_put_labels(struct sk_buff *skb, int attrtype,
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EXPORT_SYMBOL_GPL(nla_put_labels);
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int nla_get_labels(const struct nlattr *nla,
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u32 max_labels, u8 *labels, u32 label[])
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u8 max_labels, u8 *labels, u32 label[])
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{
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unsigned len = nla_len(nla);
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unsigned nla_labels;
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struct mpls_shim_hdr *nla_label;
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u8 nla_labels;
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bool bos;
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int i;
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/* len needs to be an even multiple of 4 (the label size) */
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if (len & 3)
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/* len needs to be an even multiple of 4 (the label size). Number
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* of labels is a u8 so check for overflow.
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*/
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if (len & 3 || len / 4 > 255)
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return -EINVAL;
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/* Limit the number of new labels allowed */
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@ -1548,6 +1565,10 @@ int nla_get_labels(const struct nlattr *nla,
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if (nla_labels > max_labels)
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return -EINVAL;
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/* when label == NULL, caller wants number of labels */
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if (!label)
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goto out;
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nla_label = nla_data(nla);
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bos = true;
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for (i = nla_labels - 1; i >= 0; i--, bos = false) {
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@ -1571,6 +1592,7 @@ int nla_get_labels(const struct nlattr *nla,
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label[i] = dec.label;
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}
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out:
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*labels = nla_labels;
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return 0;
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}
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@ -1632,7 +1654,6 @@ static int rtm_to_route_config(struct sk_buff *skb, struct nlmsghdr *nlh,
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err = -EINVAL;
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rtm = nlmsg_data(nlh);
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memset(cfg, 0, sizeof(*cfg));
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if (rtm->rtm_family != AF_MPLS)
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goto errout;
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@ -1731,27 +1752,43 @@ errout:
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static int mpls_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
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{
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struct mpls_route_config cfg;
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struct mpls_route_config *cfg;
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int err;
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err = rtm_to_route_config(skb, nlh, &cfg);
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if (err < 0)
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return err;
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cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
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if (!cfg)
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return -ENOMEM;
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return mpls_route_del(&cfg);
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err = rtm_to_route_config(skb, nlh, cfg);
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if (err < 0)
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goto out;
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err = mpls_route_del(cfg);
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out:
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kfree(cfg);
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return err;
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}
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static int mpls_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
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{
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struct mpls_route_config cfg;
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struct mpls_route_config *cfg;
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int err;
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err = rtm_to_route_config(skb, nlh, &cfg);
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if (err < 0)
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return err;
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cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
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if (!cfg)
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return -ENOMEM;
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return mpls_route_add(&cfg);
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err = rtm_to_route_config(skb, nlh, cfg);
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if (err < 0)
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goto out;
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err = mpls_route_add(cfg);
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out:
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kfree(cfg);
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return err;
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}
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static int mpls_dump_route(struct sk_buff *skb, u32 portid, u32 seq, int event,
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@ -1980,7 +2017,7 @@ static int resize_platform_label_table(struct net *net, size_t limit)
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/* In case the predefined labels need to be populated */
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if (limit > MPLS_LABEL_IPV4NULL) {
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struct net_device *lo = net->loopback_dev;
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rt0 = mpls_rt_alloc(1, lo->addr_len, MAX_NEW_LABELS);
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rt0 = mpls_rt_alloc(1, lo->addr_len, 0);
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if (IS_ERR(rt0))
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goto nort0;
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RCU_INIT_POINTER(rt0->rt_nh->nh_dev, lo);
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@ -1994,7 +2031,7 @@ static int resize_platform_label_table(struct net *net, size_t limit)
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}
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if (limit > MPLS_LABEL_IPV6NULL) {
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struct net_device *lo = net->loopback_dev;
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rt2 = mpls_rt_alloc(1, lo->addr_len, MAX_NEW_LABELS);
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rt2 = mpls_rt_alloc(1, lo->addr_len, 0);
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if (IS_ERR(rt2))
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goto nort2;
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RCU_INIT_POINTER(rt2->rt_nh->nh_dev, lo);
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@ -197,7 +197,7 @@ static inline struct mpls_dev *mpls_dev_get(const struct net_device *dev)
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int nla_put_labels(struct sk_buff *skb, int attrtype, u8 labels,
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const u32 label[]);
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int nla_get_labels(const struct nlattr *nla, u32 max_labels, u8 *labels,
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int nla_get_labels(const struct nlattr *nla, u8 max_labels, u8 *labels,
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u32 label[]);
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int nla_get_via(const struct nlattr *nla, u8 *via_alen, u8 *via_table,
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u8 via[]);
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