diff options
| -rw-r--r-- | net/ipv4/ipmr.c | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c index 6c24a16299c7..4c10ee771648 100644 --- a/net/ipv4/ipmr.c +++ b/net/ipv4/ipmr.c @@ -66,6 +66,7 @@ #include <net/netlink.h> #include <net/fib_rules.h> #include <linux/netconf.h> +#include <net/nexthop.h> struct ipmr_rule { struct fib_rule common; @@ -2339,6 +2340,130 @@ done: return skb->len; } +static const struct nla_policy rtm_ipmr_policy[RTA_MAX + 1] = { + [RTA_SRC] = { .type = NLA_U32 }, + [RTA_DST] = { .type = NLA_U32 }, + [RTA_IIF] = { .type = NLA_U32 }, + [RTA_TABLE] = { .type = NLA_U32 }, + [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, +}; + +static bool ipmr_rtm_validate_proto(unsigned char rtm_protocol) +{ + switch (rtm_protocol) { + case RTPROT_STATIC: + case RTPROT_MROUTED: + return true; + } + return false; +} + +static int ipmr_nla_get_ttls(const struct nlattr *nla, struct mfcctl *mfcc) +{ + struct rtnexthop *rtnh = nla_data(nla); + int remaining = nla_len(nla), vifi = 0; + + while (rtnh_ok(rtnh, remaining)) { + mfcc->mfcc_ttls[vifi] = rtnh->rtnh_hops; + if (++vifi == MAXVIFS) + break; + rtnh = rtnh_next(rtnh, &remaining); + } + + return remaining > 0 ? -EINVAL : vifi; +} + +/* returns < 0 on error, 0 for ADD_MFC and 1 for ADD_MFC_PROXY */ +static int rtm_to_ipmr_mfcc(struct net *net, struct nlmsghdr *nlh, + struct mfcctl *mfcc, int *mrtsock, + struct mr_table **mrtret) +{ + struct net_device *dev = NULL; + u32 tblid = RT_TABLE_DEFAULT; + struct mr_table *mrt; + struct nlattr *attr; + struct rtmsg *rtm; + int ret, rem; + + ret = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipmr_policy); + if (ret < 0) + goto out; + rtm = nlmsg_data(nlh); + + ret = -EINVAL; + if (rtm->rtm_family != RTNL_FAMILY_IPMR || rtm->rtm_dst_len != 32 || + rtm->rtm_type != RTN_MULTICAST || + rtm->rtm_scope != RT_SCOPE_UNIVERSE || + !ipmr_rtm_validate_proto(rtm->rtm_protocol)) + goto out; + + memset(mfcc, 0, sizeof(*mfcc)); + mfcc->mfcc_parent = -1; + ret = 0; + nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), rem) { + switch (nla_type(attr)) { + case RTA_SRC: + mfcc->mfcc_origin.s_addr = nla_get_be32(attr); + break; + case RTA_DST: + mfcc->mfcc_mcastgrp.s_addr = nla_get_be32(attr); + break; + case RTA_IIF: + dev = __dev_get_by_index(net, nla_get_u32(attr)); + if (!dev) { + ret = -ENODEV; + goto out; + } + break; + case RTA_MULTIPATH: + if (ipmr_nla_get_ttls(attr, mfcc) < 0) { + ret = -EINVAL; + goto out; + } + break; + case RTA_PREFSRC: + ret = 1; + break; + case RTA_TABLE: + tblid = nla_get_u32(attr); + break; + } + } + mrt = ipmr_get_table(net, tblid); + if (!mrt) { + ret = -ENOENT; + goto out; + } + *mrtret = mrt; + *mrtsock = rtm->rtm_protocol == RTPROT_MROUTED ? 1 : 0; + if (dev) + mfcc->mfcc_parent = ipmr_find_vif(mrt, dev); + +out: + return ret; +} + +/* takes care of both newroute and delroute */ +static int ipmr_rtm_route(struct sk_buff *skb, struct nlmsghdr *nlh) +{ + struct net *net = sock_net(skb->sk); + int ret, mrtsock, parent; + struct mr_table *tbl; + struct mfcctl mfcc; + + mrtsock = 0; + tbl = NULL; + ret = rtm_to_ipmr_mfcc(net, nlh, &mfcc, &mrtsock, &tbl); + if (ret < 0) + return ret; + + parent = ret ? mfcc.mfcc_parent : -1; + if (nlh->nlmsg_type == RTM_NEWROUTE) + return ipmr_mfc_add(net, tbl, &mfcc, mrtsock, parent); + else + return ipmr_mfc_delete(tbl, &mfcc, parent); +} + #ifdef CONFIG_PROC_FS /* The /proc interfaces to multicast routing : * /proc/net/ip_mr_cache & /proc/net/ip_mr_vif @@ -2692,6 +2817,10 @@ int __init ip_mr_init(void) #endif rtnl_register(RTNL_FAMILY_IPMR, RTM_GETROUTE, NULL, ipmr_rtm_dumproute, NULL); + rtnl_register(RTNL_FAMILY_IPMR, RTM_NEWROUTE, + ipmr_rtm_route, NULL, NULL); + rtnl_register(RTNL_FAMILY_IPMR, RTM_DELROUTE, + ipmr_rtm_route, NULL, NULL); return 0; #ifdef CONFIG_IP_PIMSM_V2 |