diff options
| -rw-r--r-- | net/mpls/af_mpls.c | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c index b097125dfa33..e432f092f2fb 100644 --- a/net/mpls/af_mpls.c +++ b/net/mpls/af_mpls.c @@ -16,6 +16,7 @@ #include <net/netns/generic.h> #include "internal.h" +#define LABEL_NOT_SPECIFIED (1<<20) #define MAX_NEW_LABELS 2 /* This maximum ha length copied from the definition of struct neighbour */ @@ -211,6 +212,19 @@ static struct packet_type mpls_packet_type __read_mostly = { .func = mpls_forward, }; +struct mpls_route_config { + u32 rc_protocol; + u32 rc_ifindex; + u16 rc_via_family; + u16 rc_via_alen; + u8 rc_via[MAX_VIA_ALEN]; + u32 rc_label; + u32 rc_output_labels; + u32 rc_output_label[MAX_NEW_LABELS]; + u32 rc_nlflags; + struct nl_info rc_nlinfo; +}; + static struct mpls_route *mpls_rt_alloc(size_t alen) { struct mpls_route *rt; @@ -245,6 +259,125 @@ static void mpls_route_update(struct net *net, unsigned index, mpls_rt_free(old); } +static unsigned find_free_label(struct net *net) +{ + unsigned index; + for (index = 16; index < net->mpls.platform_labels; index++) { + if (!net->mpls.platform_label[index]) + return index; + } + return LABEL_NOT_SPECIFIED; +} + +static int mpls_route_add(struct mpls_route_config *cfg) +{ + struct net *net = cfg->rc_nlinfo.nl_net; + struct net_device *dev = NULL; + struct mpls_route *rt, *old; + unsigned index; + int i; + int err = -EINVAL; + + index = cfg->rc_label; + + /* If a label was not specified during insert pick one */ + if ((index == LABEL_NOT_SPECIFIED) && + (cfg->rc_nlflags & NLM_F_CREATE)) { + index = find_free_label(net); + } + + /* The first 16 labels are reserved, and may not be set */ + if (index < 16) + goto errout; + + /* The full 20 bit range may not be supported. */ + if (index >= net->mpls.platform_labels) + goto errout; + + /* Ensure only a supported number of labels are present */ + if (cfg->rc_output_labels > MAX_NEW_LABELS) + goto errout; + + err = -ENODEV; + dev = dev_get_by_index(net, cfg->rc_ifindex); + if (!dev) + goto errout; + + /* For now just support ethernet devices */ + err = -EINVAL; + if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK)) + goto errout; + + err = -EINVAL; + if ((cfg->rc_via_family == AF_PACKET) && + (dev->addr_len != cfg->rc_via_alen)) + goto errout; + + /* Append makes no sense with mpls */ + err = -EINVAL; + if (cfg->rc_nlflags & NLM_F_APPEND) + goto errout; + + err = -EEXIST; + old = net->mpls.platform_label[index]; + if ((cfg->rc_nlflags & NLM_F_EXCL) && old) + goto errout; + + err = -EEXIST; + if (!(cfg->rc_nlflags & NLM_F_REPLACE) && old) + goto errout; + + err = -ENOENT; + if (!(cfg->rc_nlflags & NLM_F_CREATE) && !old) + goto errout; + + err = -ENOMEM; + rt = mpls_rt_alloc(cfg->rc_via_alen); + if (!rt) + goto errout; + + rt->rt_labels = cfg->rc_output_labels; + for (i = 0; i < rt->rt_labels; i++) + rt->rt_label[i] = cfg->rc_output_label[i]; + rt->rt_protocol = cfg->rc_protocol; + rt->rt_dev = dev; + rt->rt_via_family = cfg->rc_via_family; + memcpy(rt->rt_via, cfg->rc_via, cfg->rc_via_alen); + + mpls_route_update(net, index, NULL, rt, &cfg->rc_nlinfo); + + dev_put(dev); + return 0; + +errout: + if (dev) + dev_put(dev); + return err; +} + +static int mpls_route_del(struct mpls_route_config *cfg) +{ + struct net *net = cfg->rc_nlinfo.nl_net; + unsigned index; + int err = -EINVAL; + + index = cfg->rc_label; + + /* The first 16 labels are reserved, and may not be removed */ + if (index < 16) + goto errout; + + /* The full 20 bit range may not be supported */ + if (index >= net->mpls.platform_labels) + goto errout; + + mpls_route_update(net, index, NULL, NULL, &cfg->rc_nlinfo); + + err = 0; +errout: + return err; +} + static void mpls_ifdown(struct net_device *dev) { struct net *net = dev_net(dev); |
