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zebra: limit RTADV socket rcvbuf to 20MB #20654

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Merged
ton31337 merged 1 commit into from
Feb 3, 2026
Merged

zebra: limit RTADV socket rcvbuf to 20MB #20654

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7 changes: 7 additions & 0 deletions zebra/rtadv.c
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Original file line number Diff line number Diff line change
Expand Up @@ -988,6 +988,10 @@ static int rtadv_make_socket(ns_id_t ns_id)
struct icmp6_filter filter;
int error;

/* Limit receive buffer size to avoid unbounded growth under abnormal load */
/* 20MB provides enough headroom for RS/RA bursts while capping memory usage */
#define RTADV_RCVBUF_SIZE (20 * 1024 * 1024)

frr_with_privs(&zserv_privs) {

sock = ns_socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6, ns_id);
Expand All @@ -1004,6 +1008,9 @@ static int rtadv_make_socket(ns_id_t ns_id)
return -1;
}

/* Limit RTADV socket receive buffer */
setsockopt_so_recvbuf(sock, RTADV_RCVBUF_SIZE);

ret = setsockopt_ipv6_pktinfo(sock, 1);
if (ret < 0) {
zlog_warn("RTADV failure to set Packet Information");
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