diff options
Diffstat (limited to 'net/ipv6/mcast.c')
| -rw-r--r-- | net/ipv6/mcast.c | 116 |
1 files changed, 110 insertions, 6 deletions
diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c index 98ead2b1a669..8992ff262789 100644 --- a/net/ipv6/mcast.c +++ b/net/ipv6/mcast.c @@ -108,6 +108,10 @@ static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, struct inet6_dev *idev); #define MLD_QRV_DEFAULT 2 +/* RFC3810, 9.2. Query Interval */ +#define MLD_QI_DEFAULT (125 * HZ) +/* RFC3810, 9.3. Query Response Interval */ +#define MLD_QRI_DEFAULT (10 * HZ) /* RFC3810, 8.1 Query Version Distinctions */ #define MLD_V1_QUERY_LEN 24 @@ -1112,6 +1116,93 @@ static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs, return true; } +static void mld_set_v1_mode(struct inet6_dev *idev) +{ + /* RFC3810, relevant sections: + * - 9.1. Robustness Variable + * - 9.2. Query Interval + * - 9.3. Query Response Interval + * - 9.12. Older Version Querier Present Timeout + */ + unsigned long switchback; + + switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri; + + idev->mc_v1_seen = jiffies + switchback; +} + +static void mld_update_qrv(struct inet6_dev *idev, + const struct mld2_query *mlh2) +{ + /* RFC3810, relevant sections: + * - 5.1.8. QRV (Querier's Robustness Variable) + * - 9.1. Robustness Variable + */ + + /* The value of the Robustness Variable MUST NOT be zero, + * and SHOULD NOT be one. Catch this here if we ever run + * into such a case in future. + */ + WARN_ON(idev->mc_qrv == 0); + + if (mlh2->mld2q_qrv > 0) + idev->mc_qrv = mlh2->mld2q_qrv; + + if (unlikely(idev->mc_qrv < 2)) { + net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n", + idev->mc_qrv, MLD_QRV_DEFAULT); + idev->mc_qrv = MLD_QRV_DEFAULT; + } +} + +static void mld_update_qi(struct inet6_dev *idev, + const struct mld2_query *mlh2) +{ + /* RFC3810, relevant sections: + * - 5.1.9. QQIC (Querier's Query Interval Code) + * - 9.2. Query Interval + * - 9.12. Older Version Querier Present Timeout + * (the [Query Interval] in the last Query received) + */ + unsigned long mc_qqi; + + if (mlh2->mld2q_qqic < 128) { + mc_qqi = mlh2->mld2q_qqic; + } else { + unsigned long mc_man, mc_exp; + + mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic); + mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic); + + mc_qqi = (mc_man | 0x10) << (mc_exp + 3); + } + + idev->mc_qi = mc_qqi * HZ; +} + +static void mld_update_qri(struct inet6_dev *idev, + const struct mld2_query *mlh2) +{ + /* RFC3810, relevant sections: + * - 5.1.3. Maximum Response Code + * - 9.3. Query Response Interval + */ + unsigned long mc_qri, mc_mrc = ntohs(mlh2->mld2q_mrc); + + if (mc_mrc < 32768) { + mc_qri = mc_mrc; + } else { + unsigned long mc_man, mc_exp; + + mc_exp = MLDV2_MRC_EXP(mc_mrc); + mc_man = MLDV2_MRC_MAN(mc_mrc); + + mc_qri = (mc_man | 0x1000) << (mc_exp + 3); + } + + idev->mc_qri = msecs_to_jiffies(mc_qri); +} + /* called with rcu_read_lock() */ int igmp6_event_query(struct sk_buff *skb) { @@ -1150,12 +1241,15 @@ int igmp6_event_query(struct sk_buff *skb) return -EINVAL; if (len == MLD_V1_QUERY_LEN) { - int switchback; /* MLDv1 router present */ - max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay)); - switchback = (idev->mc_qrv + 1) * max_delay; - idev->mc_v1_seen = jiffies + switchback; + + mld_set_v1_mode(idev); + + /* cancel MLDv2 report timer */ + idev->mc_gq_running = 0; + if (del_timer(&idev->mc_gq_timer)) + __in6_dev_put(idev); /* cancel the interface change timer */ idev->mc_ifc_count = 0; @@ -1166,6 +1260,10 @@ int igmp6_event_query(struct sk_buff *skb) } else if (len >= MLD_V2_QUERY_LEN_MIN) { int srcs_offset = sizeof(struct mld2_query) - sizeof(struct icmp6hdr); + + /* hosts need to stay in MLDv1 mode, discard MLDv2 queries */ + if (MLD_V1_SEEN(idev)) + return 0; if (!pskb_may_pull(skb, srcs_offset)) return -EINVAL; @@ -1175,8 +1273,10 @@ int igmp6_event_query(struct sk_buff *skb) idev->mc_maxdelay = max_delay; - if (mlh2->mld2q_qrv) - idev->mc_qrv = mlh2->mld2q_qrv; + mld_update_qrv(idev, mlh2); + mld_update_qi(idev, mlh2); + mld_update_qri(idev, mlh2); + if (group_type == IPV6_ADDR_ANY) { /* general query */ if (mlh2->mld2q_nsrcs) return -EINVAL; /* no sources allowed */ @@ -2337,7 +2437,11 @@ void ipv6_mc_init_dev(struct inet6_dev *idev) (unsigned long)idev); setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire, (unsigned long)idev); + idev->mc_qrv = MLD_QRV_DEFAULT; + idev->mc_qi = MLD_QI_DEFAULT; + idev->mc_qri = MLD_QRI_DEFAULT; + idev->mc_maxdelay = unsolicited_report_interval(idev); idev->mc_v1_seen = 0; write_unlock_bh(&idev->lock); |