leandrof/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

ipv4: support for fib route lwtunnel encap attributes

Browse Source 
This patch adds support in ipv4 fib functions to parse user
provided encap attributes and attach encap state data to fib_nh
and rtable.

Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Roopa Prabhu
2015-07-21 10:43:47 +02:00
committed by David S. Miller
parent 499a242568
commit 571e722676
5 changed files with 122 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

96
net/ipv4/fib_semantics.c
View File

@@ -42,6 +42,7 @@
#include <net/ip_fib.h>
#include <net/netlink.h>
#include <net/nexthop.h>
#include <net/lwtunnel.h>
#include "fib_lookup.h"
@@ -208,6 +209,7 @@ static void free_fib_info_rcu(struct rcu_head *head)
change_nexthops(fi) {
if (nexthop_nh->nh_dev)
dev_put(nexthop_nh->nh_dev);
lwtunnel_state_put(nexthop_nh->nh_lwtstate);
free_nh_exceptions(nexthop_nh);
rt_fibinfo_free_cpus(nexthop_nh->nh_pcpu_rth_output);
rt_fibinfo_free(&nexthop_nh->nh_rth_input);
@@ -266,6 +268,7 @@ static inline int nh_comp(const struct fib_info *fi, const struct fib_info *ofi)
#ifdef CONFIG_IP_ROUTE_CLASSID
nh->nh_tclassid != onh->nh_tclassid ||
#endif
lwtunnel_cmp_encap(nh->nh_lwtstate, onh->nh_lwtstate) ||
((nh->nh_flags ^ onh->nh_flags) & ~RTNH_COMPARE_MASK))
return -1;
onh++;
@@ -366,6 +369,7 @@ static inline size_t fib_nlmsg_size(struct fib_info *fi)
payload += nla_total_size((RTAX_MAX * nla_total_size(4)));
if (fi->fib_nhs) {
size_t nh_encapsize = 0;
/* Also handles the special case fib_nhs == 1 */
/* each nexthop is packed in an attribute */
@@ -374,8 +378,21 @@ static inline size_t fib_nlmsg_size(struct fib_info *fi)
/* may contain flow and gateway attribute */
nhsize += 2 * nla_total_size(4);
/* grab encap info */
for_nexthops(fi) {
if (nh->nh_lwtstate) {
/* RTA_ENCAP_TYPE */
nh_encapsize += lwtunnel_get_encap_size(
nh->nh_lwtstate);
/* RTA_ENCAP */
nh_encapsize += nla_total_size(2);
}
} endfor_nexthops(fi);
/* all nexthops are packed in a nested attribute */
payload += nla_total_size(fi->fib_nhs * nhsize);
payload += nla_total_size((fi->fib_nhs * nhsize) +
nh_encapsize);
}
return payload;
@@ -452,6 +469,9 @@ static int fib_count_nexthops(struct rtnexthop *rtnh, int remaining)
static int fib_get_nhs(struct fib_info *fi, struct rtnexthop *rtnh,
int remaining, struct fib_config *cfg)
{
struct net *net = cfg->fc_nlinfo.nl_net;
int ret;
change_nexthops(fi) {
int attrlen;
@@ -475,18 +495,66 @@ static int fib_get_nhs(struct fib_info *fi, struct rtnexthop *rtnh,
if (nexthop_nh->nh_tclassid)
fi->fib_net->ipv4.fib_num_tclassid_users++;
#endif
nla = nla_find(attrs, attrlen, RTA_ENCAP);
if (nla) {
struct lwtunnel_state *lwtstate;
struct net_device *dev = NULL;
struct nlattr *nla_entype;
nla_entype = nla_find(attrs, attrlen,
RTA_ENCAP_TYPE);
if (!nla_entype)
goto err_inval;
if (cfg->fc_oif)
dev = __dev_get_by_index(net, cfg->fc_oif);
ret = lwtunnel_build_state(dev, nla_get_u16(
nla_entype),
nla, &lwtstate);
if (ret)
goto errout;
lwtunnel_state_get(lwtstate);
nexthop_nh->nh_lwtstate = lwtstate;
}
}
rtnh = rtnh_next(rtnh, &remaining);
} endfor_nexthops(fi);
return 0;
err_inval:
ret = -EINVAL;
errout:
return ret;
}
#endif
int fib_encap_match(struct net *net, u16 encap_type,
struct nlattr *encap,
int oif, const struct fib_nh *nh)
{
struct lwtunnel_state *lwtstate;
struct net_device *dev = NULL;
int ret;
if (encap_type == LWTUNNEL_ENCAP_NONE)
return 0;
if (oif)
dev = __dev_get_by_index(net, oif);
ret = lwtunnel_build_state(dev, encap_type,
encap, &lwtstate);
if (!ret)
return lwtunnel_cmp_encap(lwtstate, nh->nh_lwtstate);
return 0;
}
int fib_nh_match(struct fib_config *cfg, struct fib_info *fi)
{
struct net *net = cfg->fc_nlinfo.nl_net;
#ifdef CONFIG_IP_ROUTE_MULTIPATH
struct rtnexthop *rtnh;
int remaining;
@@ -496,6 +564,12 @@ int fib_nh_match(struct fib_config *cfg, struct fib_info *fi)
return 1;
if (cfg->fc_oif || cfg->fc_gw) {
if (cfg->fc_encap) {
if (fib_encap_match(net, cfg->fc_encap_type,
cfg->fc_encap, cfg->fc_oif,
fi->fib_nh))
return 1;
}
if ((!cfg->fc_oif || cfg->fc_oif == fi->fib_nh->nh_oif) &&
(!cfg->fc_gw || cfg->fc_gw == fi->fib_nh->nh_gw))
return 0;
@@ -882,6 +956,22 @@ struct fib_info *fib_create_info(struct fib_config *cfg)
} else {
struct fib_nh *nh = fi->fib_nh;
if (cfg->fc_encap) {
struct lwtunnel_state *lwtstate;
struct net_device *dev = NULL;
if (cfg->fc_encap_type == LWTUNNEL_ENCAP_NONE)
goto err_inval;
if (cfg->fc_oif)
dev = __dev_get_by_index(net, cfg->fc_oif);
err = lwtunnel_build_state(dev, cfg->fc_encap_type,
cfg->fc_encap, &lwtstate);
if (err)
goto failure;
lwtunnel_state_get(lwtstate);
nh->nh_lwtstate = lwtstate;
}
nh->nh_oif = cfg->fc_oif;
nh->nh_gw = cfg->fc_gw;
nh->nh_flags = cfg->fc_flags;
@@ -1055,6 +1145,8 @@ int fib_dump_info(struct sk_buff *skb, u32 portid, u32 seq, int event,
nla_put_u32(skb, RTA_FLOW, fi->fib_nh[0].nh_tclassid))
goto nla_put_failure;
#endif
if (fi->fib_nh->nh_lwtstate)
lwtunnel_fill_encap(skb, fi->fib_nh->nh_lwtstate);
}
#ifdef CONFIG_IP_ROUTE_MULTIPATH
if (fi->fib_nhs > 1) {
@@ -1090,6 +1182,8 @@ int fib_dump_info(struct sk_buff *skb, u32 portid, u32 seq, int event,
nla_put_u32(skb, RTA_FLOW, nh->nh_tclassid))
goto nla_put_failure;
#endif
if (nh->nh_lwtstate)
lwtunnel_fill_encap(skb, nh->nh_lwtstate);
/* length of rtnetlink header + attributes */
rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *) rtnh;
} endfor_nexthops(fi);