Increment the route table gen count after a modify
Increment the route table generation count after modifying a route. This signals back to TCP connections that they need to update their L2 caches as the gateway for their route may have changed. This is a heavier hammer than is needed, strictly speaking, but route changes will be unlikely enough that the performance effects of invalidating all connection route caches should be negligible. MFC after: 1 week Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D13990 Reviewed by: karels
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=328272
@ -1733,6 +1733,8 @@ rtrequest1_fib_change(struct rib_head *rnh, struct rt_addrinfo *info,
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int family, mtu;
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struct if_mtuinfo ifmtu;
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RIB_WLOCK_ASSERT(rnh);
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rt = (struct rtentry *)rnh->rnh_lookup(info->rti_info[RTAX_DST],
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info->rti_info[RTAX_NETMASK], &rnh->head);
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@ -1823,6 +1825,13 @@ rtrequest1_fib_change(struct rib_head *rnh, struct rt_addrinfo *info,
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}
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}
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/*
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* This route change may have modified the route's gateway. In that
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* case, any inpcbs that have cached this route need to invalidate their
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* llentry cache.
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*/
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rnh->rnh_gen++;
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if (ret_nrt) {
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*ret_nrt = rt;
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RT_ADDREF(rt);
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